Talk:Fukushima nuclear accident log, March 2011

Disputed sentences
These sentence are credibly questioned here. Of course, this can be restored. --Tenmei (talk) 20:41, 13 April 2011 (UTC)
 * March 11: With the loss of power from the grid and the damage to the generators, the plant has become "dark." A steam-driven turbine located in Unit 3 provide cooling to Units 1, 2 and 3.<:ref>http://www.oecd-nea.org/press/2011/NEWS-04.html Timeline for the Fukushima Dai-ichi nuclear power plant accident Later, reports indicate that only the generator for Unit 6 remained working in full operational capacity.

Questioned tables
These tables are credibly questioned here. Any one or all of them can be restored. --Tenmei (talk) 22:49, 13 April 2011 (UTC)

March 14

 * 12:30: Status of the Fukushima I station:
 * {| class="wikitable collapsible collapsed plainrowheaders"

! scope="col" style="border-right: 3px solid gray; width: 16%;" | ! scope="col" style="width: 14%;" | Unit 1 ! scope="col" style="width: 14%;" | Unit 2 ! scope="col" style="width: 14%;" | Unit 3 ! scope="col" style="width: 14%;" | Unit 4 ! scope="col" style="width: 14%;" | Unit 5 ! scope="col" style="width: 14%;" | Unit 6 ! scope="row" style="border-right: 3px solid gray;" | Power output (MWe) ! scope="row" style="border-right: 3px solid gray;" | Type of reactor ! scope="row" style="border-right: 3px solid gray;" | Status at earthquake ! scope="row" style="border-right: 3px solid gray;" | Fuel integrity ! scope="row" style="border-right: 3px solid gray;" | Containment integrity ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 1 (ECCS/RHR) ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 2 (RCIC/MUWC) ! scope="row" style="border-right: 3px solid gray;" | Building integrity ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, water level ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, pressure ! scope="row" style="border-right: 3px solid gray;" | Containment pressure ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into core ! scope="row" style="border-right: 3px solid gray;" | Containment venting ! scope="row" style="border-right: 3px solid gray;" | Environmental effect (NPS border) ! scope="row" style="border-right: 3px solid gray;" | Evacuation radius ! scope="row" style="border-right: 3px solid gray;" | INES
 * - style="border-bottom: 3px solid gray;"
 * 460
 * 784
 * 784
 * 784
 * 784
 * 1100
 * BWR-3
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-5
 * - style="border-bottom: 3px solid gray;"
 * In service
 * In service
 * In service
 * Defueled
 * Outage (scheduled)
 * Outage (scheduled)
 * Damaged
 * Not damaged
 * Damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * Not functional
 * RCIC working
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Damaged
 * Not damaged
 * Damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Unknown
 * Above core
 * Unknown
 * Safe
 * Safe
 * Safe
 * Stable
 * Stable
 * Stable
 * Safe
 * Safe
 * Safe
 * - style="border-bottom: 3px solid gray;"
 * Stable
 * Stable
 * Stable
 * Safe
 * Safe
 * Safe
 * Suspended
 * To be decided
 * Performed
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Performed
 * Preparing
 * Performed
 * Not necessary
 * Not necessary
 * Not necessary
 * colspan="6" | 20 μSv/hour at 11:44
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | 20 km
 * colspan="6" | Level 4 (estimated by NISA)
 * }


 * 20:30: Status of the Fukushima I station:
 * {| class="wikitable collapsible collapsed plainrowheaders"

! scope="col" style="border-right: 3px solid gray; width: 16%;" | ! scope="col" style="width: 14%;" | Unit 1 ! scope="col" style="width: 14%;" | Unit 2 ! scope="col" style="width: 14%;" | Unit 3 ! scope="col" style="width: 14%;" | Unit 4 ! scope="col" style="width: 14%;" | Unit 5 ! scope="col" style="width: 14%;" | Unit 6 ! scope="row" style="border-right: 3px solid gray;" | Power output (MWe) ! scope="row" style="border-right: 3px solid gray;" | Type of reactor ! scope="row" style="border-right: 3px solid gray;" | Status at earthquake ! scope="row" style="border-right: 3px solid gray;" | Fuel integrity ! scope="row" style="border-right: 3px solid gray;" | Containment integrity ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 1 (ECCS/RHR) ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 2 (RCIC/MUWC) ! scope="row" style="border-right: 3px solid gray;" | Building integrity ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, water level ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, pressure ! scope="row" style="border-right: 3px solid gray;" | Containment pressure ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into core ! scope="row" style="border-right: 3px solid gray;" | Containment venting ! scope="row" style="border-right: 3px solid gray;" | Environmental effect (NPS border) ! scope="row" style="border-right: 3px solid gray;" | Evacuation radius ! scope="row" style="border-right: 3px solid gray;" | INES
 * - style="border-bottom: 3px solid gray;"
 * 460
 * 784
 * 784
 * 784
 * 784
 * 1100
 * BWR-3
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-5
 * - style="border-bottom: 3px solid gray;"
 * In service
 * In service
 * In service
 * Defueled
 * Outage (scheduled)
 * Outage (scheduled)
 * Damaged
 * Unknown
 * Damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Damaged
 * Not damaged
 * Damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Unknown
 * Low (recovering)
 * Unknown
 * Safe
 * Safe
 * Safe
 * Low
 * Unknown
 * Stable
 * Safe
 * Safe
 * Safe
 * - style="border-bottom: 3px solid gray;"
 * Stable
 * Increasing
 * Stable
 * Safe
 * Safe
 * Safe
 * Suspended
 * Performed
 * Performed
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Performed
 * Preparing
 * Performed
 * Not necessary
 * Not necessary
 * Not necessary
 * colspan="6" | 15 μSv/hour at 13:55
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | 20 km
 * colspan="6" | Level 4 (estimated by NISA)
 * }

March 15

 * 07:00: Status of the Fukushima I station:
 * {| class="wikitable collapsible collapsed plainrowheaders"

! scope="col" style="border-right: 3px solid gray; width: 16%;" | ! scope="col" style="width: 14%;" | Unit 1 ! scope="col" style="width: 14%;" | Unit 2 ! scope="col" style="width: 14%;" | Unit 3 ! scope="col" style="width: 14%;" | Unit 4 ! scope="col" style="width: 14%;" | Unit 5 ! scope="col" style="width: 14%;" | Unit 6 ! scope="row" style="border-right: 3px solid gray;" | Power output (MWe) ! scope="row" style="border-right: 3px solid gray;" | Type of reactor ! scope="row" style="border-right: 3px solid gray;" | Status at earthquake ! scope="row" style="border-right: 3px solid gray;" | Fuel integrity ! scope="row" style="border-right: 3px solid gray;" | Containment integrity ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 1 (ECCS/RHR) ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 2 (RCIC/MUWC) ! scope="row" style="border-right: 3px solid gray;" | Building integrity ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, water level ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, pressure ! scope="row" style="border-right: 3px solid gray;" | Containment pressure ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into core ! scope="row" style="border-right: 3px solid gray;" | Containment venting ! scope="row" style="border-right: 3px solid gray;" | Environmental effect (NPS border and onsite) ! scope="row" style="border-right: 3px solid gray;" | Evacuation radius ! scope="row" style="border-right: 3px solid gray;" | INES
 * - style="border-bottom: 3px solid gray;"
 * 460
 * 784
 * 784
 * 784
 * 784
 * 1100
 * BWR-3
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-5
 * - style="border-bottom: 3px solid gray;"
 * In service
 * In service
 * In service
 * Defueled
 * Outage (scheduled)
 * Outage (scheduled)
 * Damaged
 * Damaged
 * Damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Partly damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Damaged
 * Partly damaged
 * Damaged
 * Fire in progress
 * Not damaged
 * Not damaged
 * Unknown
 * Low (recovering)
 * Unknown
 * Safe
 * Safe
 * Safe
 * Low
 * Leaked
 * Stable
 * Safe
 * Safe
 * Safe
 * - style="border-bottom: 3px solid gray;"
 * Stable
 * Increasing
 * Stable
 * Safe
 * Safe
 * Safe
 * Suspended
 * Performed
 * Performed
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Performed
 * Preparing
 * Performed
 * Not necessary
 * Not necessary
 * Not necessary
 * colspan="6" | 8217 µSv/hour at 08:30, and between 100,000 and 400,000 µSv/hour at times.
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | 20 km
 * colspan="6" | Level 4 (estimated by NISA); Level 6 (estimated by France's Nuclear Safety Authority, ASN)
 * }


 * 19:00: Status of the Fukushima I station:
 * {| class="wikitable collapsible collapsed plainrowheaders"

! scope="col" style="border-right: 3px solid gray; width: 16%;" | ! scope="col" style="width: 14%;" | Unit 1 ! scope="col" style="width: 14%;" | Unit 2 ! scope="col" style="width: 14%;" | Unit 3 ! scope="col" style="width: 14%;" | Unit 4 ! scope="col" style="width: 14%;" | Unit 5 ! scope="col" style="width: 14%;" | Unit 6 ! scope="row" style="border-right: 3px solid gray;" | Power output (MWe) ! scope="row" style="border-right: 3px solid gray;" | Type of reactor ! scope="row" style="border-right: 3px solid gray;" | Status at earthquake ! scope="row" style="border-right: 3px solid gray;" | Fuel integrity ! scope="row" style="border-right: 3px solid gray;" | Containment integrity ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 1 (ECCS/RHR) ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 2 (RCIC/MUWC) ! scope="row" style="border-right: 3px solid gray;" | Building integrity ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, water level ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, pressure ! scope="row" style="border-right: 3px solid gray;" | Containment pressure ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into core ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into containment building ! scope="row" style="border-right: 3px solid gray;" | Containment venting ! scope="row" style="border-right: 3px solid gray;" | Spent fuel integrity ! scope="row" style="border-right: 3px solid gray;" | Environmental effect (NPS border) ! scope="row" style="border-right: 3px solid gray;" | Evacuation radius ! scope="row" style="border-right: 3px solid gray;" | INES
 * - style="border-bottom: 3px solid gray;"
 * 460
 * 784
 * 784
 * 784
 * 784
 * 1100
 * BWR-3
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-5
 * - style="border-bottom: 3px solid gray;"
 * In service
 * In service
 * In service
 * Defueled
 * Outage (scheduled)
 * Outage (scheduled)
 * Damaged
 * Unknown
 * Damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Damage suspected
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Severely Damaged
 * Slightly damaged
 * Severely Damaged
 * Partially Damaged
 * Not damaged
 * Not damaged
 * Around half of the fuel
 * Recovering after dried-up
 * Around half of the fuel
 * Safe
 * Safe
 * Safe
 * Stable
 * Fluctuating
 * Stable
 * Safe
 * Safe
 * Safe
 * - style="border-bottom: 3px solid gray;"
 * Stable
 * D/W: Unknown, S/P: Atmosphere
 * Stable
 * Safe
 * Safe
 * Safe
 * Continuing
 * Continuing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * Continuing
 * To be decided
 * To be decided
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Continuing
 * Preparing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * (no data)
 * (no data)
 * (no data)
 * SFP level low, injecting water
 * SFP temperature increasing
 * SFP temperature increasing
 * colspan="6" | 489.8 µSv/hour at 16:30
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | 20 km
 * colspan="6" | Level 4 (estimated by NISA); Level 6 (estimated by ASN)
 * }

March 16

 * 08:00: Status of the Fukushima I station:
 * {| class="wikitable collapsible collapsed plainrowheaders"

! scope="col" style="border-right: 3px solid gray; width: 16%;" | ! scope="col" style="width: 14%;" | Unit 1 ! scope="col" style="width: 14%;" | Unit 2 ! scope="col" style="width: 14%;" | Unit 3 ! scope="col" style="width: 14%;" | Unit 4 ! scope="col" style="width: 14%;" | Unit 5 ! scope="col" style="width: 14%;" | Unit 6 ! scope="row" style="border-right: 3px solid gray;" | Power output (MWe) ! scope="row" style="border-right: 3px solid gray;" | Type of reactor ! scope="row" style="border-right: 3px solid gray;" | Status at earthquake ! scope="row" style="border-right: 3px solid gray;" | Fuel integrity ! scope="row" style="border-right: 3px solid gray;" | Containment integrity ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 1 (ECCS/RHR) ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 2 (RCIC/MUWC) ! scope="row" style="border-right: 3px solid gray;" | Building integrity ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, water level ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, pressure ! scope="row" style="border-right: 3px solid gray;" | Containment pressure ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into core ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into containment building ! scope="row" style="border-right: 3px solid gray;" | Containment venting ! scope="row" style="border-right: 3px solid gray;" | Spent fuel integrity ! scope="row" style="border-right: 3px solid gray;" | Environmental effect (NPS border and onsite) ! scope="row" style="border-right: 3px solid gray;" | Evacuation radius ! scope="row" style="border-right: 3px solid gray;" | INES
 * - style="border-bottom: 3px solid gray;"
 * 460
 * 784
 * 784
 * 784
 * 784
 * 1100
 * BWR-3
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-5
 * - style="border-bottom: 3px solid gray;"
 * In service
 * In service
 * In service
 * Defueled
 * Outage (scheduled)
 * Outage (scheduled)
 * 70% damaged
 * 33% damaged
 * Damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Damage suspected
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Severely damaged
 * Slightly damaged
 * Severely damaged
 * Partially damaged
 * Not damaged
 * Not damaged
 * Around half of the fuel
 * Recovering, having dried up
 * Around half of the fuel
 * Safe
 * Safe
 * Safe
 * Stable
 * Fluctuating
 * Stable
 * Safe
 * Safe
 * Safe
 * - style="border-bottom: 3px solid gray;"
 * Stable
 * D/W: Unknown, S/P: Atmosphere
 * Stable
 * Safe
 * Safe
 * Safe
 * Continuing
 * Continuing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * Continuing
 * To be decided
 * To be decided
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Continuing
 * Preparing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * (no data)
 * (no data)
 * (no data)
 * SFP level low
 * SFP level decreasing
 * SFP level decreasing
 * colspan="6" | 6308 μSv/hour at 23:35, 15 March, peaking at 1.00 Sv/hour early on 16 March and then decreasing to between 800,000 and 600,000 µSv/hour
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | 20 km
 * colspan="6" | Level 4 (estimated by NISA); Level 6 (estimated by ASN)
 * }


 * 12:30: Status of the Fukushima I station:
 * {| class="wikitable collapsible collapsed plainrowheaders"

! scope="col" style="border-right: 3px solid gray; width: 16%;" | ! scope="col" style="width: 14%;" | Unit 1 ! scope="col" style="width: 14%;" | Unit 2 ! scope="col" style="width: 14%;" | Unit 3 ! scope="col" style="width: 14%;" | Unit 4 ! scope="col" style="width: 14%;" | Unit 5 ! scope="col" style="width: 14%;" | Unit 6 ! scope="row" style="border-right: 3px solid gray;" | Power output (MWe) ! scope="row" style="border-right: 3px solid gray;" | Type of reactor ! scope="row" style="border-right: 3px solid gray;" | Status at earthquake ! scope="row" style="border-right: 3px solid gray;" | Fuel integrity ! scope="row" style="border-right: 3px solid gray;" | Containment integrity ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 1 (ECCS/RHR) ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 2 (RCIC/MUWC) ! scope="row" style="border-right: 3px solid gray;" | Building integrity ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, water level ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, pressure ! scope="row" style="border-right: 3px solid gray;" | Containment pressure ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into core ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into containment building ! scope="row" style="border-right: 3px solid gray;" | Containment venting ! scope="row" style="border-right: 3px solid gray;" | Spent fuel integrity Preparing water injection, Damage to fuel rods suspected ! scope="row" style="border-right: 3px solid gray;" | Environmental effect (NPS border) ! scope="row" style="border-right: 3px solid gray;" | Evacuation radius ! scope="row" style="border-right: 3px solid gray;" | INES
 * - style="border-bottom: 3px solid gray;"
 * 460
 * 784
 * 784
 * 784
 * 784
 * 1100
 * BWR-3
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-5
 * - style="border-bottom: 3px solid gray;"
 * In service
 * In service
 * In service
 * Defueled
 * Outage (scheduled)
 * Outage (scheduled)
 * 70% damaged<
 * 33% damaged<
 * Damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Damage suspected
 * Damage suspected
 * Not damaged
 * Not damaged
 * Not damaged
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Severely damaged
 * Slightly damaged
 * Severely damaged
 * Severely damaged
 * Not damaged
 * Not damaged
 * Around half of the fuel
 * Recovering, having dried up
 * Around half of the fuel
 * Safe
 * Safe
 * Safe
 * Stable
 * Fluctuating
 * Stable
 * Safe
 * Safe
 * Safe
 * - style="border-bottom: 3px solid gray;"
 * Stable
 * D/W: Unknown, S/P: Atmosphere
 * Stable
 * Safe
 * Safe
 * Safe
 * Continuing
 * Continuing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * Continuing
 * To be decided
 * To be decided
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Continuing
 * Preparing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * (no data)
 * (no data)
 * High temperature suspected
 * SFP level low,
 * SFP temperature increasing
 * SFP temperature increasing
 * colspan="6" | 3391 µSv/hour at 11:00, 16 March
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | 20 km from Fukushima I
 * colspan="6" | Level 4 (estimated by NISA and accepted by the IAEA); Level 6 (estimated by ASN) )
 * }


 * 19:00: Status of the Fukushima I station:
 * {| class="wikitable collapsible collapsed plainrowheaders"

! scope="col" style="border-right: 3px solid gray; width: 16%;" | ! scope="col" style="width: 14%;" | Unit 1 ! scope="col" style="width: 14%;" | Unit 2 ! scope="col" style="width: 14%;" | Unit 3 ! scope="col" style="width: 14%;" | Unit 4 ! scope="col" style="width: 14%;" | Unit 5 ! scope="col" style="width: 14%;" | Unit 6 ! scope="row" style="border-right: 3px solid gray;" | Power output (MWe) ! scope="row" style="border-right: 3px solid gray;" | Type of reactor ! scope="row" style="border-right: 3px solid gray;" | Status at earthquake ! scope="row" style="border-right: 3px solid gray;" | Fuel integrity ! scope="row" style="border-right: 3px solid gray;" | Containment integrity ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 1 (ECCS/RHR) ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 2 (RCIC/MUWC) ! scope="row" style="border-right: 3px solid gray;" | Building integrity ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, water level ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, pressure ! scope="row" style="border-right: 3px solid gray;" | Containment pressure ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into core ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into containment building ! scope="row" style="border-right: 3px solid gray;" | Containment venting ! scope="row" style="border-right: 3px solid gray;" | Integrity of fuel in spent fuel pool Preparing water injection Preparing water injection, Damage to fuel rods suspected ! scope="row" style="border-right: 3px solid gray;" | Environmental effect (NPS border) ! scope="row" style="border-right: 3px solid gray;" | Evacuation radius ! scope="row" style="border-right: 3px solid gray;" | INES
 * - style="border-bottom: 3px solid gray;"
 * 460
 * 784
 * 784
 * 784
 * 784
 * 1100
 * BWR-3
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-5
 * - style="border-bottom: 3px solid gray;"
 * In service
 * In service
 * In service
 * Defueled
 * Outage (scheduled)
 * Outage (scheduled)
 * 70% damaged
 * 33% damaged
 * Damaged
 * No fuel rods
 * Not damaged
 * Not damaged
 * Not damaged
 * Damage suspected
 * Damage suspected
 * Not damaged
 * Not damaged
 * Not damaged
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Severely damaged
 * Slightly damaged
 * Severely damaged
 * Severely damaged
 * Not damaged
 * Not damaged
 * Around half of the fuel
 * Recovering, having dried up
 * Around half of the fuel
 * Safe
 * Safe
 * Safe
 * Stable
 * Fluctuating
 * Stable
 * Safe
 * Safe
 * Safe
 * - style="border-bottom: 3px solid gray;"
 * Stable
 * D/W: Unknown, S/P: Atmosphere
 * Stable
 * Safe
 * Safe
 * Safe
 * Continuing
 * Continuing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * Continuing
 * To be decided
 * To be decided
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Continuing
 * Preparing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * (no data)
 * (no data)
 * SFP level low,
 * SFP level low,
 * SFP temperature increasing
 * SFP temperature increasing
 * colspan="6" | 1937 µSv/hour at 14:30, 16 March
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | 20 km from Fukushima I, with people living between 20 km and 30 km from the plant being instructed to stay indoors.
 * colspan="6" | Level 4 (estimated by NISA and accepted by the IAEA); Level 6 (estimated by ASN)
 * }

March 17

 * 16:00: Status of the Fukushima I station:
 * {| class="wikitable collapsible collapsed plainrowheaders"

! scope="col" style="border-right: 3px solid gray; width: 16%;" | ! scope="col" style="width: 14%;" | Unit 1 ! scope="col" style="width: 14%;" | Unit 2 ! scope="col" style="width: 14%;" | Unit 3 ! scope="col" style="width: 14%;" | Unit 4 ! scope="col" style="width: 14%;" | Unit 5 ! scope="col" style="width: 14%;" | Unit 6 ! scope="row" style="border-right: 3px solid gray;" | Power output (MWe) ! scope="row" style="border-right: 3px solid gray;" | Type of reactor ! scope="row" style="border-right: 3px solid gray;" | Status at earthquake ! scope="row" style="border-right: 3px solid gray;" | Fuel integrity ! scope="row" style="border-right: 3px solid gray;" | Containment integrity ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 1 (ECCS/RHR) ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 2 (RCIC/MUWC) ! scope="row" style="border-right: 3px solid gray;" | Building integrity ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, water level ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, pressure ! scope="row" style="border-right: 3px solid gray;" | Containment pressure ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into core ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into containment building ! scope="row" style="border-right: 3px solid gray;" | Containment venting ! scope="row" style="border-right: 3px solid gray;" | Integrity of fuel in spent fuel pool Preparing water injection Preparing water injection, Damage to fuel rods suspected ! scope="row" style="border-right: 3px solid gray;" | Environmental effect (NPS border) ! scope="row" style="border-right: 3px solid gray;" | Evacuation radius ! scope="row" style="border-right: 3px solid gray;" | INES
 * - style="border-bottom: 3px solid gray;" |
 * 460
 * 784
 * 784
 * 784
 * 784
 * 1100
 * BWR-3
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-5
 * - style="border-bottom: 3px solid gray;"
 * In service
 * In service
 * In service
 * Defueled
 * Outage (scheduled)
 * Outage (scheduled)
 * 70% damaged
 * 33% damaged
 * Damaged
 * No fuel rods
 * Not damaged
 * Not damaged
 * Not damaged
 * Damage suspected
 * Damage suspected, but considered to be unlikely.
 * Not damaged
 * Not damaged
 * Not damaged
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Severely damaged
 * Slightly damaged
 * Severely damaged
 * Severely damaged
 * Not damaged
 * Not damaged
 * Around half of the fuel
 * Higher than half of the fuel
 * Around half of the fuel
 * Safe
 * Safe
 * Safe
 * Stable
 * Unknown
 * Stable
 * Safe
 * Safe
 * Safe
 * - style="border-bottom: 3px solid gray;"
 * Stable
 * D/W: Unknown, S/P: Atmosphere
 * Stable
 * Safe
 * Safe
 * Safe
 * Continuing
 * Continuing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * Continuing
 * To be decided
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Continuing
 * Preparing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * (no data)
 * (no data)
 * SFP level low,
 * SFP level low,
 * SFP temperature increasing
 * SFP temperature increasing
 * colspan="6" | 646 µSv/hour at 11:10, 17 March
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | 20 km from Fukushima I. People living between 20 km and 30 km away are told to stay indoors.
 * colspan="6" | Level 4 (estimated by NISA and accepted by IAEA); Level 6 (estimated by ASN)
 * }


 * 22:00: Status of the Fukushima I station:
 * {| class="wikitable collapsible collapsed plainrowheaders"

! scope="col" style="border-right: 3px solid gray; width: 16%;" | ! scope="col" style="width: 14%;" | Unit 1 ! scope="col" style="width: 14%;" | Unit 2 ! scope="col" style="width: 14%;" | Unit 3 ! scope="col" style="width: 14%;" | Unit 4 ! scope="col" style="width: 14%;" | Unit 5 ! scope="col" style="width: 14%;" | Unit 6 ! scope="row" style="border-right: 3px solid gray;" | Power output (MWe) ! scope="row" style="border-right: 3px solid gray;" | Type of reactor ! scope="row" style="border-right: 3px solid gray;" | Status at earthquake ! scope="row" style="border-right: 3px solid gray;" | Fuel integrity ! scope="row" style="border-right: 3px solid gray;" | Containment integrity ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 1 (ECCS/RHR) ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 2 (RCIC/MUWC) ! scope="row" style="border-right: 3px solid gray;" | Building integrity ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, water level ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, pressure ! scope="row" style="border-right: 3px solid gray;" | Containment pressure ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into core ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into containment building ! scope="row" style="border-right: 3px solid gray;" | Containment venting ! scope="row" style="border-right: 3px solid gray;" | Integrity of fuel in spent fuel pool Starting water injection Preparing water injection, Damage to fuel rods suspected ! scope="row" style="border-right: 3px solid gray;" | Environmental effect (NPS border) ! scope="row" style="border-right: 3px solid gray;" | Evacuation radius ! scope="row" style="border-right: 3px solid gray;" | INES
 * - style="border-bottom: 3px solid gray;" |
 * 460
 * 784
 * 784
 * 784
 * 784
 * 1100
 * BWR-3
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-5
 * - style="border-bottom: 3px solid gray;"
 * In service
 * In service
 * In service
 * Defueled
 * Outage (scheduled)
 * Outage (scheduled)
 * 70% damaged
 * 33% damaged
 * Damaged
 * No fuel rods
 * Not damaged
 * Not damaged
 * Not damaged
 * Damage suspected
 * Damage suspected, but considered to be unlikely.
 * Not damaged
 * Not damaged
 * Not damaged
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Severely damaged
 * Slightly damaged
 * Severely damaged
 * Severely damaged
 * Not damaged
 * Not damaged
 * Around half of the fuel
 * Higher than half of the fuel
 * Around half of the fuel
 * Safe
 * Safe
 * Safe
 * Stable
 * Unknown
 * Stable
 * Safe
 * Safe
 * Safe
 * - style="border-bottom: 3px solid gray;"
 * Unknown
 * D/W: Unknown, S/P: Atmosphere
 * Stable
 * Safe
 * Safe
 * Safe
 * Continuing
 * Continuing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * Continuing
 * To be decided
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Continuing
 * Preparing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * (no data)
 * (no data)
 * SFP level low,
 * SFP level low,
 * SFP temperature increasing, 64.2 °C
 * SFP temperature increasing, 62.5 °C
 * colspan="6" | 309 µSv/hour at 15:30, 17 March
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | 20 km from Fukushima I. People living between 20 km and 30 km away are told to stay indoors.
 * colspan="6" | Level 4 (estimated by NISA and accepted by the IAEA); Level 6 (estimated by ASN)
 * }

March 18

 * 16:00: Status of the Fukushima I station:
 * {| class="wikitable collapsible collapsed plainrowheaders"

! scope="col" style="border-right: 3px solid gray; width: 16%;" | ! scope="col" style="width: 14%;" | Unit 1 ! scope="col" style="width: 14%;" | Unit 2 ! scope="col" style="width: 14%;" | Unit 3 ! scope="col" style="width: 14%;" | Unit 4 ! scope="col" style="width: 14%;" | Unit 5 ! scope="col" style="width: 14%;" | Unit 6 ! scope="row" style="border-right: 3px solid gray;" | Power output (MWe) ! scope="row" style="border-right: 3px solid gray;" | Type of reactor ! scope="row" style="border-right: 3px solid gray;" | Status at earthquake ! scope="row" style="border-right: 3px solid gray;" | Fuel integrity ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel integrity ! scope="row" style="border-right: 3px solid gray;" | Containment integrity ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 1 (ECCS/RHR) ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 2 (RCIC/MUWC) ! scope="row" style="border-right: 3px solid gray;" | Building integrity ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, water level ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, pressure ! scope="row" style="border-right: 3px solid gray;" | Containment pressure ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into core ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into containment building ! scope="row" style="border-right: 3px solid gray;" | Containment venting ! scope="row" style="border-right: 3px solid gray;" | Integrity of fuel in spent fuel pool Water injection continues Preparing water injection Hydrogen from SFP exploded ! scope="row" style="border-right: 3px solid gray;" | Environmental effect (NPS border) ! scope="row" style="border-right: 3px solid gray;" | Evacuation radius ! scope="row" style="border-right: 3px solid gray;" | INES
 * - style="border-bottom: 3px solid gray;" |
 * 460
 * 784
 * 784
 * 784
 * 784
 * 1100
 * BWR-3
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-5
 * - style="border-bottom: 3px solid gray;"
 * In service
 * In service
 * In service
 * Defueled
 * Outage (scheduled)
 * Outage (scheduled)
 * 70% damaged
 * 33% damaged
 * Damaged
 * No fuel rods
 * Not damaged
 * Not damaged
 * Unknown
 * Unknown
 * Unknown
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Damage suspected
 * Unknown
 * Not damaged
 * Not damaged
 * Not damaged
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Severely damaged
 * Slightly damaged
 * Severely damaged
 * Severely damaged
 * Not damaged
 * Not damaged
 * Fuel exposed
 * Fuel exposed
 * Fuel exposed
 * Safe
 * Safe
 * Safe
 * Stable
 * Unknown
 * Stable
 * Safe
 * Safe
 * Safe
 * - style="border-bottom: 3px solid gray;"
 * Unknown
 * Low
 * Low
 * Safe
 * Safe
 * Safe
 * Continuing
 * Continuing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * Continuing
 * To be decided
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Temporarily stopped
 * Temporarily stopped
 * Temporarily stopped
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Water injection to be considered
 * (no data)
 * SFP level low
 * SFP level low
 * SFP temperature increasing, 65.5 °C
 * SFP temperature increasing, 62.0 °C
 * colspan="6" | 271 µSv/hour at 07:30, 18 March
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | 20 km from Fukushima I. People living between 20 km and 30 km away are told to stay indoors.
 * colspan="6" | Level 5 (estimated by NISA and accepted by the IAEA); Level 6 (estimated by ASN)
 * }

March 19

 * 22:00: Status of the Fukushima I station:
 * {| class="wikitable collapsible collapsed plainrowheaders"

! scope="col" style="border-right: 3px solid gray; width: 16%;" | ! scope="col" style="width: 14%;" | Unit 1 ! scope="col" style="width: 14%;" | Unit 2 ! scope="col" style="width: 14%;" | Unit 3 ! scope="col" style="width: 14%;" | Unit 4 ! scope="col" style="width: 14%;" | Unit 5 ! scope="col" style="width: 14%;" | Unit 6 ! scope="row" style="border-right: 3px solid gray;" | Power output (MWe) ! scope="row" style="border-right: 3px solid gray;" | Type of reactor ! scope="row" style="border-right: 3px solid gray;" | Status at earthquake ! scope="row" style="border-right: 3px solid gray;" | Fuel integrity ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel integrity ! scope="row" style="border-right: 3px solid gray;" | Containment integrity ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 1 (ECCS/RHR) ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 2 (RCIC/MUWC) ! scope="row" style="border-right: 3px solid gray;" | Building integrity ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, water level ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, pressure ! scope="row" style="border-right: 3px solid gray;" | Containment pressure ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into core ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into containment building ! scope="row" style="border-right: 3px solid gray;" | Containment venting ! scope="row" style="border-right: 3px solid gray;" | Integrity of fuel in spent fuel pool Water injection continues Preparing water injection Hydrogen from SFP exploded ! scope="row" style="border-right: 3px solid gray;" | Environmental effect (NPS border) ! scope="row" style="border-right: 3px solid gray;" | Evacuation radius ! scope="row" style="border-right: 3px solid gray;" | INES
 * - style="border-bottom: 3px solid gray;" |
 * 460
 * 784
 * 784
 * 784
 * 784
 * 1100
 * BWR-3
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-5
 * - style="border-bottom: 3px solid gray;"
 * In service -> shutdown
 * In service -> shutdown
 * In service -> shutdown
 * Defueled
 * Outage
 * Outage
 * 70% damaged
 * 33% damaged
 * Damaged
 * No fuel rods
 * Not damaged
 * Not damaged
 * Unknown
 * Unknown
 * Unknown
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Damage suspected
 * Unknown
 * Not damaged
 * Not damaged
 * Not damaged
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Severely damaged
 * Slightly damaged
 * Severely damaged
 * Severely damaged
 * Vent hole opened on rooftop to prevent hydrogen explosion
 * Vent hole opened on rooftop to prevent hydrogen explosion
 * Fuel exposed
 * Fuel exposed
 * Fuel exposed
 * Safe
 * Safe
 * Safe
 * Stable
 * Unknown
 * Stable
 * Safe
 * Safe
 * Safe
 * - style="border-bottom: 3px solid gray;"
 * Unknown
 * Low
 * Low
 * Safe
 * Safe
 * Safe
 * Continuing
 * Continuing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * Continuing
 * To be decided
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Temporarily stopped
 * Temporarily stopped
 * Temporarily stopped
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Water injection to be considered
 * (no data)
 * SFP level low
 * SFP level low
 * SFP temperature high, but decreasing
 * SFP temperature increasing
 * colspan="6" | At 15:30, 19 March: 313.1 µSv/hour outside the west gate and 2972 µSv/hour to the north of the service building
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | 20 km from Fukushima I. People living between 20 km and 30 km away are told to stay indoors.
 * colspan="6" | Units 1-3, level 5 (estimated by NISA and accepted by the IAEA); Level 6 (estimated by ASN); Unit 4, level 3.
 * }

March 20

 * 16:00: Status of the Fukushima I station:
 * {| class="wikitable collapsible collapsed plainrowheaders"

! scope="col" style="border-right: 3px solid gray; width: 16%;" | ! scope="col" style="width: 14%;" | Unit 1 ! scope="col" style="width: 14%;" | Unit 2 ! scope="col" style="width: 14%;" | Unit 3 ! scope="col" style="width: 14%;" | Unit 4 ! scope="col" style="width: 14%;" | Unit 5 ! scope="col" style="width: 14%;" | Unit 6 ! scope="row" style="border-right: 3px solid gray;" | Power output (MWe) ! scope="row" style="border-right: 3px solid gray;" | Type of reactor ! scope="row" style="border-right: 3px solid gray;" | Status at earthquake ! scope="row" style="border-right: 3px solid gray;" | Fuel integrity ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel integrity ! scope="row" style="border-right: 3px solid gray;" | Containment integrity ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 1 (ECCS/RHR) ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 2 (RCIC/MUWC) ! scope="row" style="border-right: 3px solid gray;" | Building integrity ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, water level ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel, pressure ! scope="row" style="border-right: 3px solid gray;" | Containment pressure ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into core ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into containment building ! scope="row" style="border-right: 3px solid gray;" | Containment venting ! scope="row" style="border-right: 3px solid gray;" | Integrity of fuel in spent fuel pool Water injection continuing Water injection continuing Hydrogen from SFP exploded ! scope="row" style="border-right: 3px solid gray;" | Environmental effect (NPS border) ! scope="row" style="border-right: 3px solid gray;" | Evacuation radius ! scope="row" style="border-right: 3px solid gray;" | INES
 * - style="border-bottom: 3px solid gray;" |
 * 460
 * 784
 * 784
 * 784
 * 784
 * 1100
 * BWR-3
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-5
 * - style="border-bottom: 3px solid gray;"
 * In service -> shutdown
 * In service -> shutdown
 * In service -> shutdown
 * Defueled
 * Outage
 * Outage
 * 70% damaged
 * 33% damaged
 * Damaged
 * No fuel rods
 * Not damaged
 * Not damaged
 * Unknown
 * Unknown
 * Unknown
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Damage suspected
 * Unknown
 * Not damaged
 * Not damaged
 * Not damaged
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Severely damaged
 * Slightly damaged
 * Severely damaged
 * Severely damaged
 * Vent hole opened on rooftop to prevent hydrogen explosion
 * Vent hole opened on rooftop to prevent hydrogen explosion
 * Fuel exposed
 * Fuel exposed
 * Fuel exposed
 * Safe
 * Safe
 * Safe
 * Stable
 * Unknown
 * Stable
 * Safe
 * Safe
 * Safe
 * - style="border-bottom: 3px solid gray;"
 * Unknown
 * Low
 * Stable at higher level after increase
 * Safe
 * Safe
 * Safe
 * Continuing
 * Continuing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * Continuing
 * To be decided
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Temporarily stopped
 * Temporarily stopped
 * Temporarily stopped
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Water injection to be considered
 * (no data)
 * SFP level low
 * SFP level low
 * Pool cooling capability was recovered
 * Pool cooling capability was recovered
 * colspan="6" | At 05:40, 20 March: 269.5 µSv/hour (West Gate); and 3054 µSv/hour to the North of the Service Building (at 15:00, 20 March)
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | 20 km from nuclear power station. People living between 20 km and 30 km from the plant are instructed to stay indoors.
 * colspan="6" | Units 1-3, Level 5 (estimated by NISA and accepted by the IAEA); Level 6 (estimated by ASN);  Unit 4, Level 3.
 * }

March 21

 * 10:00: Status of the Fukushima I station:
 * {| class="wikitable collapsible collapsed plainrowheaders"

! scope="col" style="border-right: 3px solid gray; width: 16%;" | ! scope="col" style="width: 14%;" | Unit 1 ! scope="col" style="width: 14%;" | Unit 2 ! scope="col" style="width: 14%;" | Unit 3 ! scope="col" style="width: 14%;" | Unit 4 ! scope="col" style="width: 14%;" | Unit 5 ! scope="col" style="width: 14%;" | Unit 6 ! scope="row" style="border-right: 3px solid gray;" | Power output (MWe) ! scope="row" style="border-right: 3px solid gray;" | Type of reactor ! scope="row" style="border-right: 3px solid gray;" | Status at earthquake ! scope="row" style="border-right: 3px solid gray;" | Fuel integrity ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel integrity ! scope="row" style="border-right: 3px solid gray;" | Containment integrity ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 1 (ECCS/RHR) ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 2 (RCIC/MUWC) ! scope="row" style="border-right: 3px solid gray;" | Building integrity ! scope="row" style="border-right: 3px solid gray;" | Reactor pressure vessel, water level ! scope="row" style="border-right: 3px solid gray;" | Reactor pressure vessel, pressure ! scope="row" style="border-right: 3px solid gray;" | Containment pressure ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into core ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into containment building ! scope="row" style="border-right: 3px solid gray;" | Containment venting ! scope="row" style="border-right: 3px solid gray;" | Integrity of fuel in spent fuel pool Water injection continuing, effectiveness has been confirmed Water injection continuing, Hydrogen from SFP exploded ! scope="row" style="border-right: 3px solid gray;" | Environmental effect (NPS border) The Main Gate: 264.6 µSv/h at 06:00, 22 March. North of service building: 2015.0 µSv/h at 16:30, 21 March. 161 µSv/h in the town of Namie, Fukushima Prefecture, 20 km from the power plant.
 * - style="border-bottom: 3px solid gray;" |
 * 460
 * 784
 * 784
 * 784
 * 784
 * 1100
 * BWR-3
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-5
 * - style="border-bottom: 3px solid gray;"
 * In service -> shutdown
 * In service -> shutdown
 * In service -> shutdown
 * Defueled
 * Outage
 * Outage
 * 70% damaged
 * 33% damaged
 * Damaged
 * No fuel rods
 * Not damaged
 * Not damaged
 * Unknown
 * Unknown
 * Unknown
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Damage suspected
 * Unknown
 * Not damaged
 * Not damaged
 * Not damaged
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Severely damaged
 * Slightly damaged
 * Severely damaged
 * Severely damaged
 * Vent hole opened on rooftop to prevent hydrogen explosion
 * Vent hole opened on rooftop to prevent hydrogen explosion
 * Fuel exposed
 * Fuel exposed
 * Fuel exposed
 * Safe
 * Safe
 * Safe
 * Stable
 * Unknown
 * Unknown
 * Safe
 * Safe
 * Safe
 * - style="border-bottom: 3px solid gray;"
 * Unknown
 * Low
 * Low (after 20 March increase)
 * Safe
 * Safe
 * Safe
 * Continuing
 * Continuing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * Continuing
 * To be decided
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Temporarily stopped
 * Temporarily stopped
 * Temporarily stopped
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Water injection to be considered
 * Seawater Injection conducted on 20 March
 * Water level low,
 * Water level low,
 * Pool cooling capability was recovered
 * Pool cooling capability was recovered
 * colspan="6" |

Radio nuclides exceeding the national regulatory standard were detected in milk produced in Fukushima prefecture and spinach from Ibaraki, Fukushima, Tochigi, and Gunma prefectures. ! scope="row" style="border-right: 3px solid gray;" | Evacuation radius ! scope="row" style="border-right: 3px solid gray;" | INES ! scope="row" style="border-right: 3px solid gray;" | Remarks Seawater injection to the unit 2 fuel pool was conducted on 20 March. Work to recover grid power for the entire plant is in progress. So far power has been restored to the distribution switchboard for unit 2. Integrity checks of electrical equipment in unit 2 are in progress; these must be completed before the equipment can be energized. Grid power has also been partly restored to unit 5 (which continues to run from its emergency diesel generators). Radiological screening dairy and agricultural products, such as milk in Fukushima and spinach in Ibaraki prefectures, revealed levels of radioisotopes in excess of national regulatory standards. Shipment of these products has been restricted until further notice. Seawater sampled at the front coast of the station contained radioactive iodine-131, caesium-134 and caesium-137 levels exceeding the regulatory limit. Data collected by an IAEA team show radiation levels of 161 µSv/h in the town of Namie, Fukushima Prefecture, 20 km from the power plant. This level is 1,600 times higher than normal. The worldwide average background dose for a human being is about 2.4 mSv/year (0.27 µSv/h), which is 590 times less than 161 µSv/h.
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | 20 km from nuclear power station. People who live between 20 km to 30 km from the Fukushima I nuclear power station are to stay indoors.
 * colspan="6" | Units 1-3, Level 5 (estimated by NISA and accepted by the IAEA); Level 6 (estimated by ASN); Unit 4, Level 3.
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | Immediate threat is damage to fuel in the spent fuel pool (SFP), which is outside the containment vessel. Spraying water onto the SFPs in units 3 and 4 is continuing. Reductions in ambient radiation around the plant suggest that this spraying has been effective in cooling down the SFPs.
 * }

March 23

 * 21:00: Status of the Fukushima I station:
 * {| class="wikitable collapsible collapsed plainrowheaders"

! scope="col" style="border-right: 3px solid gray; width: 16%;" | ! scope="col" style="width: 14%;" | Unit 1 ! scope="col" style="width: 14%;" | Unit 2 ! scope="col" style="width: 14%;" | Unit 3 ! scope="col" style="width: 14%;" | Unit 4 ! scope="col" style="width: 14%;" | Unit 5 ! scope="col" style="width: 14%;" | Unit 6 ! scope="row" style="border-right: 3px solid gray;" | Power output (MWe) ! scope="row" style="border-right: 3px solid gray;" | Type of reactor ! scope="row" style="border-right: 3px solid gray;" | Status at earthquake ! scope="row" style="border-right: 3px solid gray;" | Core and Fuel Integrity (Loaded fuel assemblies) ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel integrity ! scope="row" style="border-right: 3px solid gray;" | Containment integrity ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 1 (ECCS/RHR) ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 2 (RCIC/MUWC) ! scope="row" style="border-right: 3px solid gray;" | Building integrity ! scope="row" style="border-right: 3px solid gray;" | Reactor pressure vessel, water level ! scope="row" style="border-right: 3px solid gray;" | Reactor pressure vessel, pressure ! scope="row" style="border-right: 3px solid gray;" | Containment pressure ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into core ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into containment building ! scope="row" style="border-right: 3px solid gray;" | Containment venting ! scope="row" style="border-right: 3px solid gray;" | Integrity of fuel in spent fuel pool (Stored spent fuel assemblies) (292) (587) (514) (1331) (946) (876) ! scope="row" style="border-right: 3px solid gray;" | Cooling of the spent fuel pool Water injection continuing Effectiveness has been confirmed Water injection continuing Hydrogen from SFP exploded ! scope="row" style="border-right: 3px solid gray;" | Main control room habitability and operability ! scope="row" style="border-right: 3px solid gray;" | Environmental effect (NPS border) The Main Gate: 265.4 µSv/h at 15:00, Mar. 23. Radioactive nuclides exceeding the legal standard were detected in milk produced in Fukushima and Ibaraki prefectures and spinach and some other vegetables produced in Fukushima, Ibaraki and other prefectures. Also, radioactive iodine exceeding the standard set by Nuclear Safety Commission was detected in tap water in Fukushima prefecture. The level of the radioactivity detected is low enough not to do harm to the health of people who take those products or water for a limited time. Monitoring results of seawater sampled at coasts in the surrounding area of the station showed that radioactive iodine-131, caesium-134 and caesium-137, exceeding the regulatory limit were detected. ! scope="row" style="border-right: 3px solid gray;" | Evacuation radius ! scope="row" style="border-right: 3px solid gray;" | INES (estimated by NISA) ! scope="row" style="border-right: 3px solid gray;" | Remarks Work to recover AC power for units 1 to 6 is in progress. External AC power has reached to units 2, 4, 5 and 6 and is now available in all the units. Integrity check of electric equipment is going on in each unit, which must be done before energizing them. Lighting has been recovered at unit 3's main control room. External AC power has replaced the emergency diesel generator in units 5 and 6.
 * - style="border-bottom: 3px solid gray;" |
 * 460
 * 784
 * 784
 * 784
 * 784
 * 1100
 * BWR-3
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-5
 * - style="border-bottom: 3px solid gray;"
 * In service -> shutdown
 * In service -> shutdown
 * In service -> shutdown
 * Outage
 * Outage
 * Outage
 * Damaged (400)
 * Damaged (548)
 * Damaged (548)
 * No fuel rods
 * Not damaged (548)
 * Not damaged (764)
 * Unknown
 * Unknown
 * Unknown
 * Not damaged
 * Not damaged
 * Not damaged
 * Not damaged
 * Damage suspected
 * Might be ”Not damaged”
 * Not damaged
 * Not damaged
 * Not damaged
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Functional
 * Functional
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Functioning (in cold shutdown)
 * Functioning (in cold shutdown)
 * - style="border-bottom: 3px solid gray;"
 * Severely damaged
 * Slightly damaged
 * Severely damaged
 * Severely damaged
 * Vent hole opened on rooftop to prevent hydrogen explosion
 * Vent hole opened on rooftop to prevent hydrogen explosion
 * Fuel exposed
 * Fuel exposed
 * Fuel exposed
 * Safe
 * Safe
 * Safe
 * Stable
 * Unknown
 * Unknown
 * Safe
 * Safe
 * Safe
 * - style="border-bottom: 3px solid gray;"
 * Stable
 * Stable
 * Decreasing after Mar. 20th increase
 * Safe
 * Safe
 * Safe
 * Continuing
 * Continuing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * (confirming)
 * To be decided
 * (confirming)
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Temporarily stopped
 * Temporarily stopped
 * Temporarily stopped
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Unknown
 * Unknown
 * Possibly damaged
 * Possibly damaged
 * Not damaged
 * Not damaged
 * Water injection to be considered
 * Seawater injection conducted on 20 March
 * Water level low,
 * Water level low,
 * Pool cooling capability was recovered
 * Pool cooling capability was recovered
 * - style="border-bottom: 3px solid gray;"
 * Poor due to loss of AC power
 * Poor due to loss of AC power
 * Poor due to loss of AC power (lighting has been recovered)
 * Poor due to loss of AC power (lighting has been recovered)
 * Not damaged (estimate)
 * Not damaged (estimate)
 * colspan="6" |
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | 20 km from nuclear power station. People living between 20 km and 30 km from the station told to stay indoors.
 * Level 5
 * Level 5
 * Level 5
 * Level 3
 * - style="border-bottom: 3px solid gray;"
 * - style="border-bottom: 3px solid gray;"
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | Immediate threat is damage of the fuel rods in the fuel pool outside the containment vessel. The operation for spraying water to the pool is continuing at units 3 and 4.
 * }

March 30

 * 21:00: Status of the Fukushima I station:
 * {| class="wikitable collapsible collapsed plainrowheaders"

! scope="col" style="border-right: 3px solid gray; width: 16%;" | ! scope="col" style="width: 14%;" | Unit 1 ! scope="col" style="width: 14%;" | Unit 2 ! scope="col" style="width: 14%;" | Unit 3 ! scope="col" style="width: 14%;" | Unit 4 ! scope="col" style="width: 14%;" | Unit 5 ! scope="col" style="width: 14%;" | Unit 6 ! scope="row" style="border-right: 3px solid gray;" | Power output (MWe) ! scope="row" style="border-right: 3px solid gray;" | Type of reactor ! scope="row" style="border-right: 3px solid gray;" | Status at earthquake ! scope="row" style="border-right: 3px solid gray;" | Core and Fuel Integrity (Loaded fuel assemblies) ! scope="row" style="border-right: 3px solid gray;" | Pressure vessel integrity ! scope="row" style="border-right: 3px solid gray;" | Containment integrity ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 1 (ECCS/RHR) ! scope="row" style="border-right: 3px solid gray;" | Core cooling system 2 (RCIC/MUWC) ! scope="row" style="border-right: 3px solid gray;" | Building integrity ! scope="row" style="border-right: 3px solid gray;" | Reactor pressure vessel, water level ! scope="row" style="border-right: 3px solid gray;" | Reactor pressure vessel, pressure ! scope="row" style="border-right: 3px solid gray;" | Containment pressure ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into core ! scope="row" style="border-right: 3px solid gray;" | Seawater injection into containment building ! scope="row" style="border-right: 3px solid gray;" | Containment venting ! scope="row" style="border-right: 3px solid gray;" | Integrity of fuel in Spent Fuel Pool (Stored spent fuel assemblies) ! scope="row" style="border-right: 3px solid gray;" | Cooling of the Spent Fuel Pool (SFP) Hydrogen from SFP exploded ! scope="row" style="border-right: 3px solid gray;" | Main Control Room Habitability & Operability ! scope="row" style="border-right: 3px solid gray;" | Environmental effect (NPS border) Radiation level: 1050 μSv/h at the south side of the office building, 163 μSv/h at the main gate, 75 μSv/h at the West gate, as of 15:00, 30 March. Radioactive material was detected from milk and agricultural products from Fukushima and neighboring prefectures. The government issues order to limit shipment (21 March) and intake (23 March) for some products from some areas. Radioiodine was detected from tap water sampled at some prefecture. Level in tap water temporally exceeds the provisional legal limit for infant consumption. Radioactive iodine, caesium, ruthenium, and tellurium were detected from seawater sample collected in the sea surrounding the power station. Nuclear Safety Commission of Japan released prediction of radioactive material spread caused by the accident (24 March), based on the computer model SPEEDI (System for Prediction of Environmental Emergency Dose Information). Radiation higher than 1 Sv/h was measured at the surface of water accumulated in the tunnel for laying piping outside Unit 2 turbine building on 27 March. Plutonium was detected from the soil of the Fukushima I site on 28 March at very low levels. ! scope="row" style="border-right: 3px solid gray;" | Evacuation radius ! scope="row" style="border-right: 3px solid gray;" | INES (estimated by NISA) ! scope="row" style="border-right: 3px solid gray;" | Remarks
 * - style="border-bottom: 3px solid gray;" |
 * 460
 * 784
 * 784
 * 784
 * 784
 * 1100
 * BWR-3
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-4
 * BWR-5
 * - style="border-bottom: 3px solid gray;"
 * In service -> shutdown
 * In service -> shutdown
 * In service -> shutdown
 * Outage
 * Outage
 * Outage
 * Damaged (400)
 * Damaged (548)
 * Damaged (548)
 * No fuel rods
 * Not damaged (548)
 * Not damaged (764)
 * Unknown
 * Unknown
 * Unknown
 * Not damaged
 * Not damaged
 * Not damaged
 * Not Damaged (estimation)
 * Damage and Leakage Suspected
 * Not Damaged (estimation)
 * Not damaged
 * Not damaged
 * Not damaged
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Functional
 * Functional
 * Not functional
 * Not functional
 * Not functional
 * Not necessary
 * Functioning (in cold shutdown)
 * Functioning (in cold shutdown)
 * - style="border-bottom: 3px solid gray;"
 * Severely damaged
 * Slightly damaged
 * Severely damaged
 * Severely damaged
 * Vent hole opened on rooftop to prevent hydrogen explosion
 * Vent hole opened on rooftop to prevent hydrogen explosion
 * Fuel exposed
 * Fuel exposed
 * Fuel exposed
 * Safe
 * Safe
 * Safe
 * Gradually increasing / Decreased a little after increasing over 400℃ on 24th
 * Unknown / Stable
 * Unknown
 * Safe
 * Safe
 * Safe
 * - style="border-bottom: 3px solid gray;"
 * Decreased a little after increasing up to 0.4 MPa on 24th
 * Stable
 * Stable
 * Safe
 * Safe
 * Safe
 * Continuing
 * Continuing
 * Continuing
 * Not necessary
 * Not necessary
 * Not necessary
 * (confirming)
 * To be decided
 * (confirming)
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Temporarily stopped
 * Temporarily stopped
 * Temporarily stopped
 * Not necessary
 * Not necessary
 * Not necessary
 * - style="border-bottom: 3px solid gray;"
 * Unknown (292)
 * Unknown (587)
 * Damage Suspected (514)
 * Possibly damaged (1331)
 * Not Damaged (946)
 * Not Damaged (876)
 * Water injection to be considered
 * Seawater Injection continue
 * Seawater spray continue and certain effect was confirmed
 * Water injection continuing,
 * Pool cooling capability was recovered
 * Pool cooling capability was recovered
 * - style="border-bottom: 3px solid gray;"
 * Poor due to loss of AC power (Lighting has been recovered)
 * Poor due to loss of AC power (Lighting has been recovered)
 * Poor due to loss of AC power (Lighting has been recovered)
 * Poor due to loss of AC power (Lighting has been recovered)
 * Not damaged (estimate)
 * Not damaged (estimate)
 * colspan="6" |
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" | 20 km from Nuclear Power Station. People who live between 20 km to 30 km from Fukushima I should consider leaving.
 * Level 5
 * Level 5
 * Level 5
 * Level 3
 * - style="border-bottom: 3px solid gray;"
 * - style="border-bottom: 3px solid gray;"
 * - style="border-bottom: 3px solid gray;"
 * colspan="6" |
 * Progress of the work to recover injection function: Water circulation for the reactor pressure vessel by temporary pumps was switched from seawater to freshwater at Units 1, 2 and 3 on 26 March, due to concern about possible erosion. High radiation is making work to restore the functioning of the original pumps difficult. Removal of water containing high concentrations of radionuclides from the basements of buildings of units 1 to 3 was partly begun on 26 March but will take time to complete. Three workers were sent to the hospital after heavily exposure on 24 March and discharged on 28 March.
 * Function of containing radioactive material: It is presumed that radioactive material inside the reactor vessel would have leaked outside the containment vessel at units 1, 2 and 3, based on the investigation of the water samples in the turbine building from 24 to 27 March. On 30 March, NISA said that air may be leaking from the reactor pressure vessels of units 2 and 3 because some of their data show the pressure in the vessels is low, but there is no indication of large cracks or holes in the vessels.
 * Cooling the spent fuel pool: Steam rising intermittently from the reactor buildings of units 1, 2, 3 and 4 has been observed. Injecting and/or spraying water into the spent fuel pool has been conducted on and off since 17 March.
 * }


 * Notes

Disputed image
The presumed usefulness of the graphic image at right was disputed here; and it was deleted from the article. In the absence of anything else, I tend to believe that this visual description is helpful; and I would support its restoration. --Tenmei (talk) 23:57, 17 April 2011 (UTC)

Removal of Fukushima nuclear accident log, March 2011
I have blanked this article and redirected it to Timeline of the Fukushima Daiichi nuclear disaster. I've taken the removed text and archived it at User:Dtgriscom/Fukushima nuclear accident log, March 2011. Please review the latter page, move all useful text to the former page, and delete all irrelevant text. -- Dan Griscom (talk) 11:23, 24 March 2013 (UTC)