Talk:Fukushima nuclear accident log, March 2011
Disputed sentences
[edit]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</ref> Later, reports indicate that only the generator for Unit 6 remained working in full operational capacity.
Questioned tables
[edit]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
[edit]- 12:30: Status of the Fukushima I station:[table 1]
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Power output (MWe) 460 784 784 784 784 1100 Type of reactor BWR-3 BWR-4 BWR-4 BWR-4 BWR-4 BWR-5 Status at earthquake In service In service In service Defueled Outage (scheduled) Outage (scheduled) Fuel integrity Damaged Not damaged Damaged Not damaged Not damaged Not damaged Containment integrity Not damaged Not damaged Not damaged Not damaged Not damaged Not damaged Core cooling system 1 (ECCS/RHR) Not functional Not functional Not functional Not necessary Not necessary Not necessary Core cooling system 2 (RCIC/MUWC) Not functional RCIC working Not functional Not necessary Not necessary Not necessary Building integrity Damaged Not damaged Damaged Not damaged Not damaged Not damaged Pressure vessel, water level Unknown Above core Unknown Safe Safe Safe Pressure vessel, pressure Stable Stable Stable Safe Safe Safe Containment pressure Stable Stable Stable Safe Safe Safe Seawater injection into core Suspended To be decided Performed Not necessary Not necessary Not necessary Containment venting Performed Preparing Performed Not necessary Not necessary Not necessary Environmental effect (NPS border) 20 μSv/hour at 11:44 Evacuation radius 20 km INES Level 4 (estimated by NISA)
- 20:30: Status of the Fukushima I station:[table 2]
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Power output (MWe) 460 784 784 784 784 1100 Type of reactor BWR-3 BWR-4 BWR-4 BWR-4 BWR-4 BWR-5 Status at earthquake In service In service In service Defueled Outage (scheduled) Outage (scheduled) Fuel integrity Damaged Unknown Damaged Not damaged Not damaged Not damaged Containment integrity Not damaged Not damaged Not damaged Not damaged Not damaged Not damaged Core cooling system 1 (ECCS/RHR) Not functional Not functional Not functional Not necessary Not necessary Not necessary Core cooling system 2 (RCIC/MUWC) Not functional Not functional Not functional Not necessary Not necessary Not necessary Building integrity Damaged Not damaged Damaged Not damaged Not damaged Not damaged Pressure vessel, water level Unknown Low (recovering) Unknown Safe Safe Safe Pressure vessel, pressure Low Unknown Stable Safe Safe Safe Containment pressure Stable Increasing Stable Safe Safe Safe Seawater injection into core Suspended Performed Performed Not necessary Not necessary Not necessary Containment venting Performed Preparing Performed Not necessary Not necessary Not necessary Environmental effect (NPS border) 15 μSv/hour at 13:55 Evacuation radius 20 km INES Level 4 (estimated by NISA)
March 15
[edit]- 07:00: Status of the Fukushima I station:
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Power output (MWe) 460 784 784 784 784 1100 Type of reactor BWR-3 BWR-4 BWR-4 BWR-4 BWR-4 BWR-5 Status at earthquake In service In service In service Defueled Outage (scheduled) Outage (scheduled) Fuel integrity Damaged Damaged Damaged Not damaged Not damaged Not damaged Containment integrity Not damaged Partly damaged Not damaged Not damaged Not damaged Not damaged Core cooling system 1 (ECCS/RHR) Not functional Not functional Not functional Not necessary Not necessary Not necessary Core cooling system 2 (RCIC/MUWC) Not functional Not functional Not functional Not necessary Not necessary Not necessary Building integrity Damaged Partly damaged Damaged Fire in progress Not damaged Not damaged Pressure vessel, water level Unknown Low (recovering) Unknown Safe Safe Safe Pressure vessel, pressure Low Leaked Stable Safe Safe Safe Containment pressure Stable Increasing Stable Safe Safe Safe Seawater injection into core Suspended Performed Performed Not necessary Not necessary Not necessary Containment venting Performed Preparing Performed Not necessary Not necessary Not necessary Environmental effect (NPS border and onsite) 8217 µSv/hour at 08:30,[table 3][table 4] and between 100,000 and 400,000 µSv/hour at times.[table 5][table 6][table 7] Evacuation radius 20 km INES Level 4 (estimated by NISA); Level 6 (estimated by France's Nuclear Safety Authority, ASN)
- 19:00: Status of the Fukushima I station:[table 8]
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Power output (MWe) 460 784 784 784 784 1100 Type of reactor BWR-3 BWR-4 BWR-4 BWR-4 BWR-4 BWR-5 Status at earthquake In service In service In service Defueled Outage (scheduled) Outage (scheduled) Fuel integrity Damaged Unknown Damaged Not damaged Not damaged Not damaged Containment integrity Not damaged Damage suspected Not damaged Not damaged Not damaged Not damaged Core cooling system 1 (ECCS/RHR) Not functional Not functional Not functional Not necessary Not necessary Not necessary Core cooling system 2 (RCIC/MUWC) Not functional Not functional Not functional Not necessary Not necessary Not necessary Building integrity Severely Damaged Slightly damaged Severely Damaged Partially Damaged Not damaged Not damaged Pressure vessel, water level Around half of the fuel Recovering after dried-up Around half of the fuel Safe Safe Safe Pressure vessel, pressure Stable Fluctuating Stable Safe Safe Safe Containment pressure Stable D/W: Unknown, S/P: Atmosphere Stable Safe Safe Safe Seawater injection into core Continuing Continuing Continuing Not necessary Not necessary Not necessary Seawater injection into containment building Continuing To be decided To be decided Not necessary Not necessary Not necessary Containment venting Continuing Preparing Continuing Not necessary Not necessary Not necessary Spent fuel integrity (no data) (no data) (no data) SFP level low, injecting water SFP temperature increasing SFP temperature increasing Environmental effect (NPS border) 489.8 µSv/hour at 16:30 Evacuation radius 20 km INES Level 4 (estimated by NISA); Level 6 (estimated by ASN)
March 16
[edit]- 08:00: Status of the Fukushima I station:[table 9]
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Power output (MWe) 460 784 784 784 784 1100 Type of reactor BWR-3 BWR-4 BWR-4 BWR-4 BWR-4 BWR-5 Status at earthquake In service In service In service Defueled Outage (scheduled) Outage (scheduled) Fuel integrity 70% damaged[table 10] 33% damaged[table 10] Damaged Not damaged Not damaged Not damaged Containment integrity Not damaged Damage suspected Not damaged Not damaged Not damaged Not damaged Core cooling system 1 (ECCS/RHR) Not functional Not functional Not functional Not necessary Not necessary Not necessary Core cooling system 2 (RCIC/MUWC) Not functional Not functional Not functional Not necessary Not necessary Not necessary Building integrity Severely damaged Slightly damaged Severely damaged Partially damaged Not damaged Not damaged Pressure vessel, water level Around half of the fuel Recovering, having dried up Around half of the fuel Safe Safe Safe Pressure vessel, pressure Stable Fluctuating Stable Safe Safe Safe Containment pressure Stable D/W: Unknown, S/P: Atmosphere Stable Safe Safe Safe Seawater injection into core Continuing Continuing Continuing Not necessary Not necessary Not necessary Seawater injection into containment building Continuing To be decided To be decided Not necessary Not necessary Not necessary Containment venting Continuing Preparing Continuing Not necessary Not necessary Not necessary Spent fuel integrity (no data) (no data) (no data) SFP level low SFP level decreasing SFP level decreasing Environmental effect (NPS border and onsite) 6308 μSv/hour at 23:35, 15 March,[table 9] peaking at 1.00 Sv/hour early on 16 March and then decreasing to between 800,000 and 600,000 µSv/hour[table 11] Evacuation radius 20 km INES Level 4 (estimated by NISA); Level 6 (estimated by ASN)
- 12:30: Status of the Fukushima I station:[table 12]
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Power output (MWe) 460 784 784 784 784 1100 Type of reactor BWR-3 BWR-4 BWR-4 BWR-4 BWR-4 BWR-5 Status at earthquake In service In service In service Defueled Outage (scheduled) Outage (scheduled) Fuel integrity 70% damaged<[table 10] 33% damaged<[table 10] Damaged Not damaged Not damaged Not damaged Containment integrity Not damaged Damage suspected Damage suspected Not damaged Not damaged Not damaged Core cooling system 1 (ECCS/RHR) Not functional Not functional Not functional Not necessary Not necessary Not necessary Core cooling system 2 (RCIC/MUWC) Not functional Not functional Not functional Not necessary Not necessary Not necessary Building integrity Severely damaged Slightly damaged Severely damaged Severely damaged Not damaged Not damaged Pressure vessel, water level Around half of the fuel Recovering, having dried up Around half of the fuel Safe Safe Safe Pressure vessel, pressure Stable Fluctuating Stable Safe Safe Safe Containment pressure Stable D/W: Unknown, S/P: Atmosphere Stable Safe Safe Safe Seawater injection into core Continuing Continuing Continuing Not necessary Not necessary Not necessary Seawater injection into containment building Continuing To be decided To be decided Not necessary Not necessary Not necessary Containment venting Continuing Preparing Continuing Not necessary Not necessary Not necessary Spent fuel integrity (no data) (no data) High temperature suspected SFP level low,
Preparing water injection,
Damage to fuel rods suspectedSFP temperature increasing SFP temperature increasing Environmental effect (NPS border) 3391 µSv/hour at 11:00, 16 March[table 12] Evacuation radius 20 km from Fukushima I INES Level 4 (estimated by NISA and accepted by the IAEA); Level 6 (estimated by ASN)[table 13][table 14][table 15])
- 19:00: Status of the Fukushima I station:[table 16]
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Power output (MWe) 460 784 784 784 784 1100 Type of reactor BWR-3 BWR-4 BWR-4 BWR-4 BWR-4 BWR-5 Status at earthquake In service In service In service Defueled Outage (scheduled) Outage (scheduled) Fuel integrity 70% damaged[1] 33% damaged[1] Damaged No fuel rods Not damaged Not damaged Containment integrity Not damaged Damage suspected Damage suspected Not damaged Not damaged Not damaged Core cooling system 1 (ECCS/RHR) Not functional Not functional Not functional Not necessary Not necessary Not necessary Core cooling system 2 (RCIC/MUWC) Not functional Not functional Not functional Not necessary Not necessary Not necessary Building integrity Severely damaged Slightly damaged Severely damaged Severely damaged Not damaged Not damaged Pressure vessel, water level Around half of the fuel Recovering, having dried up Around half of the fuel Safe Safe Safe Pressure vessel, pressure Stable Fluctuating Stable Safe Safe Safe Containment pressure Stable D/W: Unknown, S/P: Atmosphere Stable Safe Safe Safe Seawater injection into core Continuing Continuing Continuing Not necessary Not necessary Not necessary Seawater injection into containment building Continuing To be decided To be decided Not necessary Not necessary Not necessary Containment venting Continuing Preparing Continuing Not necessary Not necessary Not necessary Integrity of fuel in spent fuel pool (no data) (no data) SFP level low,
Preparing water injectionSFP level low,
Preparing water injection,
Damage to fuel rods suspectedSFP temperature increasing SFP temperature increasing Environmental effect (NPS border) 1937 µSv/hour at 14:30, 16 March Evacuation radius 20 km from Fukushima I, with people living between 20 km and 30 km from the plant being instructed to stay indoors. INES Level 4 (estimated by NISA and accepted by the IAEA); Level 6 (estimated by ASN)[table 14][table 15][table 17]
March 17
[edit]- 16:00: Status of the Fukushima I station:[table 18]
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Power output (MWe) 460 784 784 784 784 1100 Type of reactor BWR-3 BWR-4 BWR-4 BWR-4 BWR-4 BWR-5 Status at earthquake In service In service In service Defueled Outage (scheduled) Outage (scheduled) Fuel integrity 70% damaged[1] 33% damaged[1] Damaged No fuel rods Not damaged Not damaged Containment integrity Not damaged Damage suspected Damage suspected, but considered to be unlikely.[table 19] Not damaged Not damaged Not damaged Core cooling system 1 (ECCS/RHR) Not functional Not functional Not functional Not necessary Not necessary Not necessary Core cooling system 2 (RCIC/MUWC) Not functional Not functional Not functional Not necessary Not necessary Not necessary Building integrity Severely damaged Slightly damaged Severely damaged Severely damaged Not damaged Not damaged Pressure vessel, water level Around half of the fuel Higher than half of the fuel Around half of the fuel Safe Safe Safe Pressure vessel, pressure Stable Unknown Stable Safe Safe Safe Containment pressure Stable D/W: Unknown, S/P: Atmosphere Stable Safe Safe Safe Seawater injection into core Continuing Continuing Continuing Not necessary Not necessary Not necessary Seawater injection into containment building Continuing To be decided Continuing Not necessary Not necessary Not necessary Containment venting Continuing Preparing Continuing Not necessary Not necessary Not necessary Integrity of fuel in spent fuel pool (no data) (no data) SFP level low,
Preparing water injectionSFP level low,
Preparing water injection,
Damage to fuel rods suspectedSFP temperature increasing SFP temperature increasing Environmental effect (NPS border) 646 µSv/hour at 11:10, 17 March Evacuation radius 20 km from Fukushima I. People living between 20 km and 30 km away are told to stay indoors. INES Level 4 (estimated by NISA and accepted by IAEA); Level 6 (estimated by ASN)[table 14][table 15][2]
- 22:00: Status of the Fukushima I station:[table 20]
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Power output (MWe) 460 784 784 784 784 1100 Type of reactor BWR-3 BWR-4 BWR-4 BWR-4 BWR-4 BWR-5 Status at earthquake In service In service In service Defueled Outage (scheduled) Outage (scheduled) Fuel integrity 70% damaged[1] 33% damaged[1] Damaged No fuel rods Not damaged Not damaged Containment integrity Not damaged Damage suspected Damage suspected, but considered to be unlikely.[table 19] Not damaged Not damaged Not damaged Core cooling system 1 (ECCS/RHR) Not functional Not functional Not functional Not necessary Not necessary Not necessary Core cooling system 2 (RCIC/MUWC) Not functional Not functional Not functional Not necessary Not necessary Not necessary Building integrity Severely damaged Slightly damaged Severely damaged Severely damaged Not damaged Not damaged Pressure vessel, water level Around half of the fuel Higher than half of the fuel Around half of the fuel Safe Safe Safe Pressure vessel, pressure Stable Unknown Stable Safe Safe Safe Containment pressure Unknown D/W: Unknown, S/P: Atmosphere Stable Safe Safe Safe Seawater injection into core Continuing Continuing Continuing Not necessary Not necessary Not necessary Seawater injection into containment building Continuing To be decided Continuing Not necessary Not necessary Not necessary Containment venting Continuing Preparing Continuing Not necessary Not necessary Not necessary Integrity of fuel in spent fuel pool (no data) (no data) SFP level low,
Starting water injectionSFP level low,
Preparing water injection,
Damage to fuel rods suspectedSFP temperature increasing, 64.2 °C SFP temperature increasing, 62.5 °C Environmental effect (NPS border) 309 µSv/hour at 15:30, 17 March[table 21] Evacuation radius 20 km from Fukushima I. People living between 20 km and 30 km away are told to stay indoors. INES Level 4 (estimated by NISA and accepted by the IAEA); Level 6 (estimated by ASN)[table 14][table 15][table 17]
March 18
[edit]- 16:00: Status of the Fukushima I station:[table 22]
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Power output (MWe) 460 784 784 784 784 1100 Type of reactor BWR-3 BWR-4 BWR-4 BWR-4 BWR-4 BWR-5 Status at earthquake In service In service In service Defueled Outage (scheduled) Outage (scheduled) Fuel integrity 70% damaged[table 10] 33% damaged[table 10] Damaged No fuel rods Not damaged Not damaged Pressure vessel integrity Unknown Unknown Unknown Not damaged Not damaged Not damaged Containment integrity Not damaged Damage suspected Unknown Not damaged Not damaged Not damaged Core cooling system 1 (ECCS/RHR) Not functional Not functional Not functional Not necessary Not necessary Not necessary Core cooling system 2 (RCIC/MUWC) Not functional Not functional Not functional Not necessary Not necessary Not necessary Building integrity Severely damaged Slightly damaged Severely damaged Severely damaged Not damaged Not damaged Pressure vessel, water level Fuel exposed Fuel exposed Fuel exposed Safe Safe Safe Pressure vessel, pressure Stable Unknown Stable Safe Safe Safe Containment pressure Unknown Low Low Safe Safe Safe Seawater injection into core Continuing Continuing Continuing Not necessary Not necessary Not necessary Seawater injection into containment building Continuing To be decided Continuing Not necessary Not necessary Not necessary Containment venting Temporarily stopped Temporarily stopped Temporarily stopped Not necessary Not necessary Not necessary Integrity of fuel in spent fuel pool Water injection to be considered (no data) SFP level low
Water injection continuesSFP level low
Preparing water injection
Hydrogen from SFP explodedSFP temperature increasing, 65.5 °C SFP temperature increasing, 62.0 °C Environmental effect (NPS border) 271 µSv/hour at 07:30, 18 March[table 23] Evacuation radius 20 km from Fukushima I. People living between 20 km and 30 km away are told to stay indoors. INES Level 5 (estimated by NISA and accepted by the IAEA); Level 6 (estimated by ASN)[table 14][table 15][table 17]
March 19
[edit]- 22:00: Status of the Fukushima I station:[table 24]
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Power output (MWe) 460 784 784 784 784 1100 Type of reactor BWR-3 BWR-4 BWR-4 BWR-4 BWR-4 BWR-5 Status at earthquake In service -> shutdown In service -> shutdown In service -> shutdown Defueled Outage Outage Fuel integrity 70% damaged[table 10] 33% damaged[table 10] Damaged No fuel rods Not damaged Not damaged Pressure vessel integrity Unknown Unknown Unknown Not damaged Not damaged Not damaged Containment integrity Not damaged Damage suspected Unknown Not damaged Not damaged Not damaged Core cooling system 1 (ECCS/RHR) Not functional Not functional Not functional Not necessary Not necessary Not necessary Core cooling system 2 (RCIC/MUWC) Not functional Not functional Not functional Not necessary Not necessary Not necessary Building integrity 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 Pressure vessel, water level Fuel exposed Fuel exposed Fuel exposed Safe Safe Safe Pressure vessel, pressure Stable Unknown Stable Safe Safe Safe Containment pressure Unknown Low Low Safe Safe Safe Seawater injection into core Continuing Continuing Continuing Not necessary Not necessary Not necessary Seawater injection into containment building Continuing To be decided Continuing Not necessary Not necessary Not necessary Containment venting Temporarily stopped Temporarily stopped Temporarily stopped Not necessary Not necessary Not necessary Integrity of fuel in spent fuel pool Water injection to be considered (no data) SFP level low
Water injection continuesSFP level low
Preparing water injection
Hydrogen from SFP explodedSFP temperature high, but decreasing SFP temperature increasing Environmental effect (NPS border) At 15:30, 19 March: 313.1 µSv/hour outside the west gate and 2972 µSv/hour to the north of the service building[table 24] Evacuation radius 20 km from Fukushima I. People living between 20 km and 30 km away are told to stay indoors. INES Units 1-3, level 5 (estimated by NISA and accepted by the IAEA); Level 6 (estimated by ASN);[table 14][table 15][table 17] Unit 4, level 3.[table 24]
March 20
[edit]- 16:00: Status of the Fukushima I station:[table 25]
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Power output (MWe) 460 784 784 784 784 1100 Type of reactor BWR-3 BWR-4 BWR-4 BWR-4 BWR-4 BWR-5 Status at earthquake In service -> shutdown In service -> shutdown In service -> shutdown Defueled Outage Outage Fuel integrity 70% damaged[table 10] 33% damaged[1] Damaged No fuel rods Not damaged Not damaged Pressure vessel integrity Unknown Unknown Unknown Not damaged Not damaged Not damaged Containment integrity Not damaged Damage suspected Unknown Not damaged Not damaged Not damaged Core cooling system 1 (ECCS/RHR) Not functional Not functional Not functional Not necessary Not necessary Not necessary Core cooling system 2 (RCIC/MUWC) Not functional Not functional Not functional Not necessary Not necessary Not necessary Building integrity 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 Pressure vessel, water level Fuel exposed Fuel exposed Fuel exposed Safe Safe Safe Pressure vessel, pressure Stable Unknown Stable Safe Safe Safe Containment pressure Unknown Low Stable at higher level after increase Safe Safe Safe Seawater injection into core Continuing Continuing Continuing Not necessary Not necessary Not necessary Seawater injection into containment building Continuing To be decided Continuing Not necessary Not necessary Not necessary Containment venting Temporarily stopped Temporarily stopped Temporarily stopped Not necessary Not necessary Not necessary Integrity of fuel in spent fuel pool Water injection to be considered (no data) SFP level low
Water injection continuingSFP level low
Water injection continuing
Hydrogen from SFP explodedPool cooling capability was recovered Pool cooling capability was recovered Environmental effect (NPS border) 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) Evacuation radius 20 km from nuclear power station. People living between 20 km and 30 km from the plant are instructed to stay indoors. INES Units 1-3, Level 5 (estimated by NISA and accepted by the IAEA); Level 6 (estimated by ASN);[table 14][table 15][table 17] Unit 4, Level 3.[3]
March 21
[edit]- 10:00: Status of the Fukushima I station:[table 26]
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Power output (MWe) 460 784 784 784 784 1100 Type of reactor BWR-3 BWR-4 BWR-4 BWR-4 BWR-4 BWR-5 Status at earthquake In service -> shutdown In service -> shutdown In service -> shutdown Defueled Outage Outage Fuel integrity 70% damaged[table 10] 33% damaged[table 10] Damaged No fuel rods Not damaged Not damaged Pressure vessel integrity Unknown Unknown Unknown Not damaged Not damaged Not damaged Containment integrity Not damaged Damage suspected Unknown Not damaged Not damaged Not damaged Core cooling system 1 (ECCS/RHR) Not functional Not functional Not functional Not necessary Not necessary Not necessary Core cooling system 2 (RCIC/MUWC) Not functional Not functional Not functional Not necessary Not necessary Not necessary Building integrity 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 Reactor pressure vessel, water level Fuel exposed Fuel exposed Fuel exposed Safe Safe Safe Reactor pressure vessel, pressure Stable Unknown Unknown Safe Safe Safe Containment pressure Unknown Low Low (after 20 March increase) Safe Safe Safe Seawater injection into core Continuing Continuing Continuing Not necessary Not necessary Not necessary Seawater injection into containment building Continuing To be decided Continuing Not necessary Not necessary Not necessary Containment venting Temporarily stopped Temporarily stopped Temporarily stopped Not necessary Not necessary Not necessary Integrity of fuel in spent fuel pool Water injection to be considered Seawater Injection conducted on 20 March Water level low,
Water injection continuing,
effectiveness has been confirmedWater level low,
Water injection continuing,
Hydrogen from SFP explodedPool cooling capability was recovered Pool cooling capability was recovered 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.
Radio nuclides exceeding the national regulatory standard were detected in milk produced in Fukushima prefecture and spinach from Ibaraki, Fukushima, Tochigi, and Gunma prefectures.Evacuation radius 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. INES Units 1-3, Level 5 (estimated by NISA and accepted by the IAEA); Level 6 (estimated by ASN);[table 14][table 15][table 17] Unit 4, Level 3.[3] Remarks 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. 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.[table 27] 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.[table 28]
March 23
[edit]- 21:00: Status of the Fukushima I station:[table 29]
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Power output (MWe) 460 784 784 784 784 1100 Type of reactor BWR-3 BWR-4 BWR-4 BWR-4 BWR-4 BWR-5 Status at earthquake In service -> shutdown In service -> shutdown In service -> shutdown Outage Outage Outage Core and Fuel Integrity (Loaded fuel assemblies) Damaged (400) Damaged (548) Damaged (548) No fuel rods Not damaged (548) Not damaged (764) Pressure vessel integrity Unknown Unknown Unknown Not damaged Not damaged Not damaged Containment integrity Not damaged Damage suspected Might be ”Not damaged” Not damaged Not damaged Not damaged Core cooling system 1 (ECCS/RHR) Not functional Not functional Not functional Not necessary Functional Functional Core cooling system 2 (RCIC/MUWC) Not functional Not functional Not functional Not necessary Functioning (in cold shutdown) Functioning (in cold shutdown) Building integrity 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 Reactor pressure vessel, water level Fuel exposed Fuel exposed Fuel exposed Safe Safe Safe Reactor pressure vessel, pressure Stable Unknown Unknown Safe Safe Safe Containment pressure Stable Stable Decreasing after Mar. 20th increase Safe Safe Safe Seawater injection into core Continuing Continuing Continuing Not necessary Not necessary Not necessary Seawater injection into containment building (confirming) To be decided (confirming) Not necessary Not necessary Not necessary Containment venting Temporarily stopped Temporarily stopped Temporarily stopped Not necessary Not necessary Not necessary Integrity of fuel in spent fuel pool (Stored spent fuel assemblies) Unknown
(292)Unknown
(587)Possibly damaged
(514)Possibly damaged
(1331)Not damaged
(946)Not damaged
(876)Cooling of the spent fuel pool Water injection to be considered Seawater injection conducted on 20 March Water level low,
Water injection continuing
Effectiveness has been confirmedWater level low,
Water injection continuing
Hydrogen from SFP explodedPool cooling capability was recovered Pool cooling capability was recovered Main control room habitability and operability 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) 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.
Evacuation radius 20 km from nuclear power station. People living between 20 km and 30 km from the station told to stay indoors. INES (estimated by NISA) Level 5 Level 5 Level 5 Level 3 - - Remarks 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. 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.
March 30
[edit]- 21:00: Status of the Fukushima I station:[table 30]
Unit 1 Unit 2 Unit 3 Unit 4 Unit 5 Unit 6 Power output (MWe) 460 784 784 784 784 1100 Type of reactor BWR-3 BWR-4 BWR-4 BWR-4 BWR-4 BWR-5 Status at earthquake In service -> shutdown In service -> shutdown In service -> shutdown Outage Outage Outage Core and Fuel Integrity (Loaded fuel assemblies) Damaged (400) Damaged (548) Damaged (548) No fuel rods Not damaged (548) Not damaged (764) Pressure vessel integrity Unknown Unknown Unknown Not damaged Not damaged Not damaged Containment integrity Not Damaged (estimation) Damage and Leakage Suspected Not Damaged (estimation) Not damaged Not damaged Not damaged Core cooling system 1 (ECCS/RHR) Not functional Not functional Not functional Not necessary Functional Functional Core cooling system 2 (RCIC/MUWC) Not functional Not functional Not functional Not necessary Functioning (in cold shutdown) Functioning (in cold shutdown) Building integrity 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 Reactor pressure vessel, water level Fuel exposed Fuel exposed Fuel exposed Safe Safe Safe Reactor pressure vessel, pressure Gradually increasing / Decreased a little after increasing over 400℃ on 24th Unknown / Stable Unknown Safe Safe Safe Containment pressure Decreased a little after increasing up to 0.4 MPa on 24th Stable Stable Safe Safe Safe Seawater injection into core Continuing Continuing Continuing Not necessary Not necessary Not necessary Seawater injection into containment building (confirming) To be decided (confirming) Not necessary Not necessary Not necessary Containment venting Temporarily stopped Temporarily stopped Temporarily stopped Not necessary Not necessary Not necessary Integrity of fuel in Spent Fuel Pool (Stored spent fuel assemblies) Unknown (292) Unknown (587) Damage Suspected (514) Possibly damaged (1331) Not Damaged (946) Not Damaged (876) Cooling of the Spent Fuel Pool (SFP) Water injection to be considered Seawater Injection continue Seawater spray continue and certain effect was confirmed Water injection continuing,
Hydrogen from SFP explodedPool cooling capability was recovered Pool cooling capability was recovered Main Control Room Habitability & Operability 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) 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).[table 31][table 32] 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.
Evacuation radius 20 km from Nuclear Power Station. People who live between 20 km to 30 km from Fukushima I should consider leaving. INES (estimated by NISA) Level 5 Level 5 Level 5 Level 3 - - Remarks - 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
- ^ "Status of nuclear power plants in Fukushima as of 12:30 March 14 (Estimated by JAIF)" (PDF). JAIF.
- ^ "Status of nuclear power plants in Fukushima as of 20:30 March 14 (Estimated by JAIF)" (PDF). JAIF.
- ^ "Earthquake Report – JAIF: No. 6, Status of Unit-2 of Fukushima #1 power station" (PDF). JAIF. 15 March 2011.
- ^ "Status of nuclear power plants in Fukushima as of 10:30 March 15 (Estimated by JAIF)" (PDF). JAIF. 15 March 2011.
- ^ "Radiation levels spike at Japanese nuclear plant". CNN. 15 March 2011.
- ^ http://www.jiji.com/jc/c?g=soc_30&k=2011031500479 |title=放射線、福島原発で400ミリシーベルト=「人体に影響及ぼす可能性」-官房長官
- ^ "「燃料の買いだめはやめて」枝野官房長官会見全文". Asahi Shimbun (in Japanese). Japan.
{{cite web}}
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suggested) (help) - ^ "Status of nuclear power plants in Fukushima as of 19:00 March 15 (Estimated by JAIF)" (PDF). JAIF.
- ^ a b "Status of nuclear power plants in Fukushima as of 8:00 March 16 (Estimated by JAIF)" (PDF). JAIF.
- ^ a b c d e f g h i j k "Japan earthquake: Fire erupts again at Fukushima Daiichi reactor; nuclears rods damaged at other reactors". Los Angeles Times. 27 February 2011. Retrieved 17 March 2011.
- ^ Talmadge, Eric; Yuasa, Shino (15 March 2011). "Japan suspends work at stricken nuclear plant". Yahoo! News. Associated Press.
- ^ a b "Status of nuclear power plants in Fukushima as of 12:30 March 16 (Estimated by JAIF)" (PDF). JAIF.
- ^ Cite error: The named reference
telegraph2
was invoked but never defined (see the help page). - ^ a b c d e f g h "UPDATE 1-French nuclear agency now rates Japan accident at 6". Reuters. Retrieved 17 March 2011.
- ^ a b c d e f g h "Harmful Radiation Leak After Japan Explosion". news.sky.com. 2011. Retrieved 15 March 2011.
- ^ Cite error: The named reference
JAIF_status_20110316_1900
was invoked but never defined (see the help page). - ^ a b c d e f Japan earthquake: live – Telegraph)
- ^ http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1300350525P.pdf
- ^ a b "Containment vessel failure unlikely: Edano". The Japan Times. 17 March 2011. Retrieved 17 March 2011.
- ^ http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1300368041P.pdf
- ^ "/ Asia-Pacific - Japan in 'battle against time', says IAEA". Financial Times. Retrieved 19 March 2011.
- ^ "Status of nuclear power plants in Fukushima as of 16:00 March 18 (Estimated by JAIF)" (PDF). JAIF. 18 March 2011.
- ^ "Between the Poles: Fukushima Daiichi: Radiation Level Continues to Drop at Plant Perimeter". Geospatial.blogs.com. Retrieved 19 March 2011.
- ^ a b c "Status of nuclear power plants in Fukushima as of 22:00 March 19 (Estimated by JAIF)" (PDF). JAIF. 19 March 2011. Cite error: The named reference "JAIF_status_20110319_2200" was defined multiple times with different content (see the help page).
- ^ Cite error: The named reference
JAIF_status_20110320_1600
was invoked but never defined (see the help page). - ^ http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1300758392P.pdf
- ^ "http://english.kyodonews.jp/news/2011/03/80057.html". English.kyodonews.jp. Retrieved 23 March 2011.
{{cite web}}
: External link in
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- ^ "D:\My Documents\WordPerfect\WordPerfect 8.0\2000Report\AAMaintext\Maintext.wpd" (PDF). Retrieved 23 March 2011.
- ^ http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1300882515P.pdf
- ^ http://www.jaif.or.jp/english/news_images/pdf/ENGNEWS01_1301489625P.pdf
- ^ http://www.nsc.go.jp/info/110323_top_siryo.pdf
- ^ System for Prediction of Environment Emergency Dose Information(SPEEDI)
Disputed image
[edit]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
[edit]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)
- ^ a b c d e f g Cite error: The named reference
latimes671
was invoked but never defined (see the help page). - ^ Cite error: The named reference
telegraph1
was invoked but never defined (see the help page). - ^ a b Cite error: The named reference
JAIF_status_20110319_2200
was invoked but never defined (see the help page).