System status during the Fukushima nuclear disaster

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Fukushima I: Units 1 to 4 are centrally affected by the nuclear disaster, Units 5 and 6 are about 500 meters away

During the Fukushima nuclear disaster, various data and measured values ​​on the condition of the power plant systems were recorded at the Fukushima Daiichi nuclear power plant . They show how the usual values ​​of normal operation have been exceeded over time.

Condition of reactors 1 to 3

From March 16, 2011, the Japanese Ministry of Economic Affairs, METI, published a table provided by the power plant operator Tepco with the technical parameters of reactors 1 to 3, with Japanese labeling. As of March 24, the Japanese nuclear regulatory agency NISA also published English translations of these tables. There are also German translations of the Society for Plant and Reactor Safety .

In detail, these reports contain measured values ​​for the cooling water feed, the cooling water level, the reactor pressure, temperature and radiation dose rate, as well as the pressure and radiation in the condensation chambers. For example, data on reactor pressures and cooling water levels from the days before March 16 can be found in a NISA presentation on April 4.

The following data are mainly taken from the Japanese originals of the METI. The published METI data for March 19, 21 and 24 are incomplete; here - where available - the other two sources were used.

Measured values ​​from block 1, March – July 2011, partly incorrect

Radiation in the reactors

Measurement values ​​block 2, March – July
Measured values ​​for block 3, March – July

Due to the power failure during the series of accidents, the reactors could no longer be cooled. This caused reactors 1 to 3 to overheat ; the fuel rods were partially exposed and damaged. There was a significant release of ionizing radiation in the reactors, which is shown in the table below. Values ​​that rise again are marked in red . The values ​​of block 1 are only of limited significance, as the sensors were probably damaged.

There are two measuring points, A and B , in the middle area of ​​the containment ( dry well ) and in the condensation chamber ( suppression chamber ) . By April 16, only the B values ​​for reactor 1 and the A values ​​for reactors 2 and 3 were published. This selection was basically retained in the table for the measurements after April 16. Only in the condensation chamber of Unit 2 were there noticeable deviations, which are recorded separately in the table.

Date
(2011) 		Local time Reactor 1 (Sv / h) Reactor 2 (Sv / h) Reactor 3 (Sv / h)
Security
Non- controlling
container
B 		Condensation
sations-
chamber
B 		Security
Non- controlling
container
A 		Condensate
sations-
chamber 		Security
Non- controlling
container
A 		Condensation
sations-
chamber
A
A. B.
March 16 12:25 93.8 3.01
17. March 12:50 0.0041
 31.6
 84.4 2.43
March 18th 07: 55-12: 35 0.00375
 46.9 78.0 2.37 105 5.90
March, 20th 15: 00-16: 00 12.0
 40.0 62.5
 2.13 71.7 2.00
March 22 10: 30-15: 30 46.5 34.0 53.6 1.90 60.0 1.58
March 23 09: 10-14: 20 48.0 29.9 50.7 1.67 60.2 1.74
March 24th 06: 10-10: 00 40.9 25.8 47.4 1.36 53.3 1.45
25th March 14: 00-16: 30 37.1 24.5 45.2 1.54 38.8 1.31
26th of March 09: 30-10: 00 35.1 23.6 43.4 1.49 36.1 1.40
27th of March 09: 00-10: 10 34.6 22.2 41.6 1.41 33.7 1.31
28th March 10: 30-12: 30 33.9 20.8 40.4 1.39 31.0 1.23
March 29 04: 00-04: 45 36.0 20.0 40.4 1.37 29.2 1.18
March 30 13: 00-13: 30 37.7 18.2 39.6 1.26 26.8 1.09
March 31 09: 40-12: 00 41.2 17.2 37.9 1.16 25.4 1.04
April 1st 10: 00-11: 45 43.0 17.2 37.0 1.09 24.2 0.98
2nd of April 12: 00-12: 10 45.1 16.0 35.7 0.97 23.2 0.94
3rd of April 09: 00-10: 30 44.6 14.9 34.3 0.94 21.7 0.90
4. April 09: 30-11: 00 38.7 12.2 32.8 0.88 21.1 0.86
April 5th 06: 00-10: 20 31.5 10.2 32.1 0.87 20.6 0.83
April 6th 00:00 31.1 8.8 31.5 0.84 20.9 0.82
7th of April 06:00 30.8 12.9 30.6 0.80 19.6 0.78
April 8th 12: 00-13: 00 68.3 12.2 29.4 0.76 18.8 0.74
9th April 12: 00-12: 25 11.9 29.2 0.74 18.4 0.72
10th of April 06: 00-10: 00 11.5 28.9 0.73 18.1 0.70
April 16 12:00 9.2 26.4 0.61 20.0
 0.62
17th April 12:00 6.7 26.0 0.60 121 15.9 0.61
20th of April 12:00 2.1 24.9 0.55 103 15.5 0.59
April, 30th 05:00 1.57 21.9 0.44 45 13.9 0.52
1st of May 11:00 1.27 21.6 0.43 42 13.7 0.52
2.May 05:00 1.23 21.4 0.43 39 13.4 0.51
May 3rd 11:00 1.20 21.2 0.42 47 13.0 0.47
May 4th 11:00 1.10 21.0 0.41 53 12.7 0.50
5th of May 11:00 1.23 20.7 0.41 84 12.6 0.46
May 6th 05:00 1.17 20.5 0.40 118 12.4 0.49
May 7th 05:00 1.15 20.3 0.39 135 12.3 0.49
8th of May 05:00 1.14 20.1 0.39 148 12.2 0.48
May 9 12:00 1.13 20.0 0.38 128 12.1 0.47
10th of May 12:00 1.11 19.7 0.38 117 12.1 0.47
May 15 11:00 1.06 18.8 0.35 68 9.9 0.45
May 20th 11:00 46.5 1.03 18.2 0.33 53 8.3 0.41
  1. ↑ a b Here “ 指示 不良 ” ( shiji furyō ) was reported, which means “wrong instruction” or “wrong instruction”. Possibly it was a typo and the similar-looking " 提示 不良 " ( teiji furyō ) - which means "display error " - was meant.
  2. ↑ a b c d The containment atmosphere monitoring system had not yet been restored (CAMS 未 復旧 , CAMS mifukkyū ).
  3. ↑ a b c d implausible value, probably still problems with the measuring device
  4. ↑ "6.25 × 10 −1 Sv / h" were reported, probably meaning 6.25 · 10 1 .
  5. ↑ a b c From April 9th, a "defective measuring device" ( 計 器 不良 , keiki furyō ) was reported here, from April 17th for both measurement channels A and B.
  6. ↑ Probably a reading error, on the days before and after the reading is steadily decreasing

Amounts of fed cooling water

Cooling water quantities

On the evening of March 12th, the makeshift cooling of reactor 1 began by injecting seawater into the pressure vessel , on March 13th also in reactor 3 and on March 14th in reactor 2. From March 17th, the injected water quantities were daily in the METI reports published, partly accurate to liters per minute, partly rounded to 10 liters per minute or to cubic meters per hour.

The following table contains a selection of the published data, whereby the values ​​reported by Tepco once a day are extrapolated to cubic meters per day for a better overview. The actual water quantities may differ because Tepco only reported the flow for one point in time per day. The amounts that entered the reactor can be smaller because water was lost on the way there. For Block 3 on March 20, for example, there is talk of a lower “injection flow rate” due to increased reactor pressure.

date Reactor 1
(m³ / day) 		Reactor 2
(m³ / day) 		Reactor 3
(m³ / day) 		Accuracy
(m³ / day)
Infeed of sea water:
March 12th 125
 - -
March 13th 182 - 191
the 14th of March 40 310
March, 15 257 1862 745
March 16 259 1862 861
17. March 291
 590-1150
 260-488
March 18th 478
 806 360 > ± 7
19th March 448 356 514
March, 20th 48 480 864 > ± 12
March 21st 36 374
March 22 48 288 > ± 12
March 23 270
 288 > ± 12
March 24th 230 288 > ± 12
Feeding fresh water:
26th of March 173 446 353 > ± 7
28th March 163 168 302 > ± 1
March 30 192 167 167 > ± 1
April 1st 192 216 167 > ± 1
7th of April 144 192 168 > ± 12
April 14th 144 168 168 > ± 12
April 24th 144 168 163 > ± 1
April 27 142 166 166 > ± 1
April 28 The containment containers of units 1 and 3 are to be completely filled with water by June in order to facilitate the cooling of the reactor core. For this purpose, more water is introduced into reactor 1 on a trial basis.
240 168 163 > ± 1
April 29 144 168 156 > ± 1
April, 30th 144 166 156 > ± 1
1st of May Because the temperatures in reactor 3 rise again, the amount of water fed in is increased.
144 166 158 > ± 1
2.May 144 168 163 > ± 1
May 3rd 142 168 166 > ± 1
May 4th 144 166 168 > ± 1
5th of May 144 168 216 > ± 1
May 6th 144 168 216 > ± 1
May 7th 192 168 216 > ± 1
8th of May 192 168 216 > ± 1
12th of May 192 168 216 > ± 1
May 13th 190 166 286 > ± 1
May 14th 192 168 373 > ± 2
May 15 192 168 368 > ± 2
May 16 240 168 368 > ± 2
17th of May 240 163 368 > ± 2
May 18 144 168 432 > ± 1
23. May 146 168 432 > ± 1
May 24th 146 168 362 > ± 1
25. May 144 168 396 > ± 1
  1. ↑ 80 m³ of pure water from the tanks in 9 hours = approx. 9 m³ / h; Continuation from 7 p.m. with sea water, assuming the same flow rate
  2. ↑ a b no flow meter available ( 流量計 無 , ryūryōkei nashi ) according to the first source, but the second still gives data
  3. ↑ a b different information in the two sources, possibly fluctuating flow at different times of the day
  4. ↑ a b c fluctuating / incorrect display of the flow meter ( 流量 ハ ン チ ン グ , ryūryō hanchingu )
  5. ↑ Conversion from the injection via fire extinguish line to a regular feed line ( feedwater line )

Temperatures in the cooling pool

Due to the power failure during the series of accidents, all cooling pools overheated because their cooling systems failed.

Reactor blocks 5 and 6

The following table shows the temperature profile in the cooling basins of reactor blocks 5 and 6 during the critical period. The normal operating temperature is up to 40 ° C.

Time
(local time) 		Block 5 Block 6 source Remarks
March 14, 7:08 pm  59.7 ° C 58.0 ° C IAEA published March 16
March 15, 7:00 p.m. 60.4 ° C 58.5 ° C IAEA published March 16
March 16, 2:00 p.m. 62.7 ° C 60.0 ° C IAEA published March 16
March 17, 12:00 64.2 ° C 62.5 ° C NISA
March 18, 1:00 p.m. 66.3 ° C 64.0 ° C NISA
March 19, 11:00 66.6 ° C 66.5 ° C NISA
March 19, 6:00 p.m. 48.1 ° C 67.0 ° C NISA Emergency power supply for Block 5 restored
March 20, 7:00 am 37.1 ° C 41.0 ° C NISA Emergency power supply for Block 6 restored
March 20, 4:00 p.m. 35.1 ° C 28.0 ° C NISA Cold shutdown of Block 5 at 2:30 p.m.
March 21, 5:00 am 39.5 ° C 32.0 ° C NISA Cold shutdown of Block 6 on March 20th at 7:27 pm
March 22, 5:00 p.m. 42.3 ° C 36.5 ° C NISA

Afterwards the temperatures leveled off between 20 and 40 ° C.

Central cooling pool

The central cooling pool also overheated:

Time
(local time) 		Water
temperature 		source Remarks
March 11, before 2:46 pm approx. 30 ° C Kantei
March 18, 11:19 am  55 ° C NISA
March 19, 9:00 am 57 ° C NISA
March 21, 4:30 pm 61 ° C NISA Spraying with water cannons
March 23, 1:15 p.m. 57 ° C NISA
March 24, 6:40 pm 73 ° C NISA
March 25, 3:20 pm 53 ° C NISA Cooling restored
March 26, 8:30 am 46 ° C NISA
March 27, 8:00 am 39 ° C NISA

The temperature then continued to drop and leveled off at around 30 ° C.

Overall condition of the reactor blocks

The Japanese Nuclear Industry Forum (JAIF) has been issuing regular reports on the state of the Fukushima I nuclear power plant since March 15. The following tables show this state at different times; the times are always Japanese local time.

March 17, 2011

Status from March 17th at 14:00 local time:

Block 1 Block 2 Block 3 Block 4 Block 5 Block 6
Operating status at the time of the earthquake in operation → quick shutdown in operation → quick shutdown in operation → quick shutdown switched off switched off switched off
Condition of core and fuel rods damaged damaged damaged no fuel rods in the core not damaged not damaged
Condition of the reactor pressure vessel unknown unknown unknown
State of the containment not damaged Damage suspected Damage suspected not damaged not damaged not damaged
Reactor cooling system (alternating current) not operational not operational not operational unnecessary unnecessary unnecessary
Reactor cooling system (steam operated) not operational not operational not operational unnecessary unnecessary unnecessary
Condition of the reactor building severely damaged slightly damaged severely damaged severely damaged not damaged not damaged
Water level in the reactor pressure vessel Fuel rods about half covered Fuel rods more than half covered Fuel rods about half covered for sure for sure for sure
Pressure in the reactor pressure vessel stable unknown (sensors without power supply) stable for sure for sure for sure
Pressure in the containment unknown Pressure chamber: unknown, condensation chamber: atmosphere stable for sure for sure for sure
Water injection into the reactor core continues (sea water) continues (sea water) continues (sea water) unnecessary unnecessary unnecessary
Water supply in safety container continues (sea water) still to be decided continues (sea water) unnecessary unnecessary unnecessary
Pressure relief containment to be continued in preparation to be continued unnecessary unnecessary unnecessary
Condition of the fuel rods in the spent fuel (no information) (no information) Low water level, preparation of water feed Low water level, water feed preparation, fuel rod damage suspected Pool temperature rises Pool temperature rises

March 22, 2011

Status from March 22nd at 9:00 p.m. local time:

Block 1 Block 2 Block 3 Block 4 Block 5 Block 6
Operating status at the time of the earthquake in operation → quick shutdown in operation → quick shutdown in operation → quick shutdown switched off switched off switched off
Condition of core and fuel rods damaged damaged damaged no fuel rods in the core not damaged not damaged
Condition of the reactor pressure vessel unknown unknown unknown not damaged not damaged not damaged
State of the containment not damaged Damage suspected possibly undamaged not damaged not damaged not damaged
Reactor cooling system 1: injection (electric powered) not operational not operational not operational unnecessary on stand by on stand by
Reactor cooling system 2: heat exchanger (electric powered) not operational not operational not operational unnecessary in operation in operation
Reactor cooling system (steam operated) not operational not operational not operational unnecessary unnecessary unnecessary
Condition of the reactor building badly damaged (hydrogen explosion) slightly damaged badly damaged (hydrogen explosion) badly damaged (hydrogen explosion) Vent was created to vent hydrogen Vent was created to vent hydrogen
Water level in the reactor pressure vessel Fuel rods exposed Fuel rods exposed Fuel rods exposed for sure for sure for sure
Pressure in the reactor pressure vessel stable unknown unknown for sure for sure for sure
Pressure in the containment stable stable falling after increase for sure for sure for sure
Water injection into the reactor core continues (sea water) continues (sea water) continues (sea water) unnecessary unnecessary unnecessary
Water supply in containment (will be confirmed) not decided yet (will be confirmed) unnecessary unnecessary unnecessary
Pressure relief containment temporarily stopped temporarily stopped temporarily stopped unnecessary unnecessary unnecessary
Condition of the fuel rods in the spent fuel Water injection is being considered Water injection was carried out The water level is low, the water is being sprayed The water level is low, the water is being sprayed Cooling restored Cooling restored
INES classification by NISA Level 5 Level 5 Level 5 level 3 - -

March 28, 2011

Status from March 28th at 4:00 p.m. local time:

Block 1 Block 2 Block 3 Block 4 Block 5 Block 6
Operating status at the time of the earthquake in operation → quick shutdown in operation → quick shutdown in operation → quick shutdown switched off switched off switched off
Condition of core and fuel rods damaged damaged, partial meltdown damaged no fuel rods in the core not damaged not damaged
Condition of the reactor pressure vessel unknown unknown unknown not damaged not damaged not damaged
State of the containment not damaged Damage and leakage suspected not damaged not damaged not damaged not damaged
Reactor cooling system 1: injection (electric powered) not operational not operational not operational unnecessary on stand by on stand by
Reactor cooling system 2: heat exchanger (electric powered) not operational not operational not operational unnecessary in operation in operation
Reactor cooling system (steam operated) not operational not operational not operational unnecessary unnecessary unnecessary
Condition of the reactor building badly damaged (hydrogen explosion) slightly damaged badly damaged (hydrogen explosion) badly damaged (hydrogen explosion) Vent was created to vent hydrogen Vent was created to vent hydrogen
Water level in the reactor pressure vessel Fuel rods fully or partially exposed Fuel rods fully or partially exposed Fuel rods fully or partially exposed for sure for sure for sure
Pressure / temperature in the reactor pressure vessel slightly decreased after increase / 400 ° C on March 24th. unknown / stable unknown for sure for sure for sure
Pressure in the containment slightly decreased after increasing to 4 bar on March 24th stable stable for sure for sure for sure
Water injection into the reactor core continues (fresh water) continues (fresh water) continues (fresh water) unnecessary unnecessary unnecessary
Water supply in containment (will be confirmed) not decided yet (will be confirmed) unnecessary unnecessary unnecessary
Pressure relief containment temporarily stopped temporarily stopped temporarily stopped unnecessary unnecessary unnecessary
Condition of the fuel rods in the spent fuel unknown unknown Damage suspected possibly damaged undamaged undamaged
Cooling of the fuel rods in the spent fuel Water injection is being considered Water injection was carried out The water level is low, the water is being sprayed The water level is low, the water is being sprayed Cooling restored Cooling restored
Functionality of the control room low due to power loss, lighting available in the control rooms probably undamaged

April 12, 2011

Status from April 12th at 8:00 p.m. local time:

Block 1 Block 2 Block 3 Block 4 Block 5 Block 6
Operating status at the time of the earthquake in operation → quick shutdown in operation → quick shutdown in operation → quick shutdown switched off switched off switched off
Condition of core and fuel rods 70% damaged 30% damaged, partial meltdown 25% damaged no fuel rods in the core not damaged not damaged
Condition of the reactor pressure vessel unknown unknown unknown probably undamaged not damaged probably undamaged
State of the containment not damaged Damage and leakage suspected not damaged not damaged not damaged not damaged
Reactor cooling system 1: injection (electric powered) not operational not operational not operational unnecessary on stand by on stand by
Reactor cooling system 2: heat exchanger (electric powered) not operational not operational not operational unnecessary in operation in operation
Reactor cooling system (steam operated) not operational not operational not operational unnecessary unnecessary unnecessary
Condition of the reactor building badly damaged (hydrogen explosion) slightly damaged badly damaged (hydrogen explosion) badly damaged (hydrogen explosion) Vent was created to vent hydrogen Vent was created to vent hydrogen
Water level in the reactor pressure vessel Fuel rods fully or partially exposed Fuel rods fully or partially exposed Fuel rods fully or partially exposed for sure for sure for sure
Pressure / temperature in the reactor pressure vessel Gradually rising / slightly falling after rising above 400 ° C on March 24th. unknown / stable unknown for sure for sure for sure
Pressure in the containment slightly decreased after increasing to 4 bar on March 24th stable stable for sure for sure for sure
Water injection into the reactor core continues (fresh water) continues (fresh water) continues (fresh water) unnecessary unnecessary unnecessary
Water supply in safety container (Confirmation pending) not decided yet (sea water) (Confirmation pending) unnecessary unnecessary unnecessary
Pressure relief containment temporarily stopped temporarily stopped temporarily stopped unnecessary unnecessary unnecessary
Condition of the fuel rods in the spent fuel unknown unknown Damage suspected possibly damaged undamaged undamaged
Cooling of the fuel rods in the spent fuel Water spraying continues (fresh water) Water supply continues (fresh water) Water spraying and feeding continues (fresh water) Water spraying and feeding continues (fresh water) Cooling restored Cooling restored
Functionality of the control room low due to power loss, lighting available in the control rooms probably undamaged
  1. ↑ a b c Tepco estimate based on measurements of the local dose rate in the containment on March 15
  2. ↑ a b There are two measuring sensors that deliver different values.

April 28, 2011

Status from April 28th at 12:00 local time:

Block 1 Block 2 Block 3 Block 4 Block 5 Block 6
Operating status at the time of the earthquake in operation → quick shutdown in operation → quick shutdown in operation → quick shutdown switched off switched off switched off
Condition of core and fuel rods 55% damaged 35% damaged, partial meltdown 30% damaged no fuel rods in the core not damaged not damaged
Condition of the reactor pressure vessel unknown unknown unknown not damaged not damaged not damaged
State of the containment probably undamaged Damage and leakage suspected probably undamaged not damaged not damaged not damaged
Reactor cooling system 1: injection (electric powered) not operational not operational not operational unnecessary on stand by on stand by
Reactor cooling system 2: heat exchanger (electric powered) not operational not operational not operational unnecessary in operation in operation
Reactor cooling system (steam operated) not operational not operational not operational unnecessary unnecessary unnecessary
Condition of the reactor building badly damaged (hydrogen explosion) slightly damaged badly damaged (hydrogen explosion) badly damaged (hydrogen explosion) Vent was created to vent hydrogen Vent was created to vent hydrogen
Water level in the reactor pressure vessel Fuel rods fully or partially exposed Fuel rods fully or partially exposed Fuel rods fully or partially exposed for sure for sure for sure
Pressure / temperature in the reactor pressure vessel Gradually rising / slightly falling after rising above 400 ° C on March 24th. unknown / stable unknown for sure for sure for sure
Pressure in the containment slightly decreased after increasing to 4 bar on March 24th stable stable for sure for sure for sure
Water injection into the reactor core continues (fresh water) continues (fresh water) continues (fresh water) unnecessary unnecessary unnecessary
Water supply in safety container should be topped up with feed water; started on April 27th should be topped up with feed water should be topped up with feed water unnecessary unnecessary unnecessary
Pressure relief containment temporarily stopped temporarily stopped temporarily stopped unnecessary unnecessary unnecessary
Condition of the fuel rods in the spent fuel unknown unknown Damage suspected possibly damaged undamaged undamaged
Cooling of the fuel rods in the spent fuel Water spraying continues (fresh water) Water supply continues (fresh water) Water spraying and feeding continues (fresh water) Water spraying and feeding continues (fresh water) Cooling restored Cooling restored
Functionality of the control room low due to power loss, lighting available in the control rooms probably undamaged
  1. ↑ a b c corrected Tepco estimate based on measurements of the local dose rate in the containment on March 15
  2. ↑ a b There are two measuring sensors that deliver different values.

Web links

Commons : Data graphs relating to the Fukushima I Nuclear Power Plant  - collection of images, videos and audio files

Individual evidence

  1. ↑ The 2011 off the Pacific coast of Tohoku Pacific Earthquake and the seismic damage to the NPPs (reactor data on PDF pages 16, 25 and 29) ( Memento from April 13, 2011 on WebCite ) (English, pdf). NISA, April 4, 2011, accessed April 13, 2011.
  2. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-03-16: 14: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 36 kB). Ministry of Economy, Trade and Industry, April 16, 2011.
  3. ↑ a b プ ラ ン ト 関 連 パ ラ メ ー タ (2011-03-17: 17: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, pdf). Ministry of Economy, Trade and Industry, March 17, 2011.
  4. ↑ a b プ ラ ン ト 関 連 パ ラ メ ー タ (2011-03-18: 14: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 41 kB). Ministry of Economy, Trade and Industry, March 18, 2011, accessed March 25, 2011.
  5. ↑ a b プ ラ ン ト 関 連 パ ラ メ ー タ (2011-03-20: 16: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 83 kB). Ministry of Economy, Trade and Industry, March 20, 2011, accessed March 25, 2011.
  6. ↑ a b プ ラ ン ト 関 連 パ ラ メ ー タ (2011-03-22: 17: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 90 kB). Ministry of Economy, Trade and Industry, March 22, 2011, accessed April 16, 2011.
  7. ↑ a b プ ラ ン ト 関 連 パ ラ メ ー タ (2011-03-23: 16: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 91 kB). Ministry of Economy, Trade and Industry, March 23, 2011; accessed March 25, 2011.
  8. ↑ a b Fukushima Di-ichi Nuclear Power Station Major Parameters of the Plant (As of 18:05 March 24th) ( Memento from April 17, 2011 on WebCite ) (English, pdf). NISA, March 24, 2011, accessed April 17, 2011.
  9. ↑ Brief overview of the current security situation, as of March 24, 2011, 4:00 p.m. (CET) ( Memento from April 16, 2011 on WebCite ) (PDF; 194 kB). Society for Plant and Reactor Safety, March 25, 2011, accessed on March 25, 2011.
  10. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-03-25: 16: 30) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 97 kB). Ministry of Economy, Trade and Industry, March 25, 2011; accessed March 25, 2011.
  11. ↑ a b プ ラ ン ト 関 連 パ ラ メ ー タ (2011-03-26: 11: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 53 kB). Ministry of Economy, Trade and Industry, March 26, 2011, accessed March 26, 2011.
  12. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-03-27: 14: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 334 kB). Ministry of Economy, Trade and Industry, March 27, 2011, accessed March 27, 2011.
  13. ↑ a b プ ラ ン ト 関 連 パ ラ メ ー タ (2011-03-28: 14: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 348 kB). Ministry of Economy, Trade and Industry, March 28, 2011, accessed March 28, 2011.
  14. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-03-29: 06: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 347 kB). Ministry of Economy, Trade and Industry, March 29, 2011; accessed March 29, 2011.
  15. ↑ a b プ ラ ン ト 関 連 パ ラ メ ー タ (2011-03-30: 14: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 348 kB). Ministry of Economy, Trade and Industry, March 30, 2011, accessed April 16, 2011.
  16. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-03-31: 14: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 334 kB). Ministry of Economy, Trade and Industry, March 31, 2011, accessed April 16, 2011.
  17. ↑ a b プ ラ ン ト 関 連 パ ラ メ ー タ (2011-04-01: 14: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 330 kB). Ministry of Economy, Trade and Industry, April 1, 2011, accessed April 16, 2011.
  18. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-04-02: 14: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 359 kB). Ministry of Economy, Trade and Industry, April 2, 2011, accessed April 16, 2011.
  19. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-04-03: 13: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 358 kB). Ministry of Economy, Trade and Industry, April 3, 2011, accessed April 16, 2011.
  20. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-04-04: 14: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 376 kB). Ministry of Economy, Trade and Industry, April 4, 2011, accessed April 16, 2011.
  21. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-04-05: 13: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 362 kB). Ministry of Economy, Trade and Industry, April 5, 2011, accessed April 16, 2011. Page 4
  22. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-04-06: 05: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 368 kB). Ministry of Economy, Trade and Industry, April 6, 2011, accessed April 16, 2011.
  23. ↑ a b プ ラ ン ト 関 連 パ ラ メ ー タ (2011-04-07: 06: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 379 kB). Ministry of Economy, Trade and Industry, April 7, 2011, accessed April 16, 2011.
  24. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-04-08: 14: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 365 kB). Ministry of Economy, Trade and Industry, April 8, 2011, accessed April 16, 2011.
  25. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-04-09: 14: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 383 kB). Ministry of Economy, Trade and Industry, April 9, 2011, accessed April 16, 2011.
  26. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-04-10: 11: 00) ( Memento from April 16, 2011 on WebCite ) (Japanese, PDF; 379 kB). Ministry of Economy, Trade and Industry, April 10, 2011, accessed April 16, 2011.
  27. ↑ Fukushima Dai-ichi Nuclear Power Station Major Parameters of the Plant (As of 14:00, April 16th) ( Memento from May 6, 2011 on WebCite ) (English, pdf). NISA, April 16, 2011, accessed May 6, 2011.
  28. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-04-17: 14: 00) ( Memento from May 9, 2011 on WebCite ) (Japanese, PDF; 435 kB). Ministry of Economy, Trade and Industry, April 17, 2011, accessed May 6, 2011.
  29. ↑ Fukushima Dai-ichi Nuclear Power Station Major Parameters of the Plant (As of 13:00, April 20th) ( Memento from May 6, 2011 on WebCite ) (English, pdf). NISA, April 20, 2011, accessed May 6, 2011.
  30. ↑ a b Fukushima Dai-ichi Nuclear Power Station Major Parameters of the Plant (As of 06:00, April 30th) ( Memento from May 6, 2011 on WebCite ) (English, pdf). NISA, April 30, 2011, accessed May 6, 2011.
  31. ↑ a b Fukushima Dai-ichi Nuclear Power Station Major Parameters of the Plant (As of 12:00, May 1) ( Memento from May 6, 2011 on WebCite ) (English, pdf). NISA, May 1, 2011, accessed May 6, 2011.
  32. ↑ a b Fukushima Dai-ichi Nuclear Power Station Major Parameters of the Plant (As of 7:00, May 2) ( Memento from May 6, 2011 on WebCite ) (English, pdf). NISA, May 2, 2011, accessed May 6, 2011.
  33. ↑ a b Fukushima Dai-ichi Nuclear Power Station Major Parameters of the Plant (As of 12:00, May 3) ( Memento from May 6, 2011 on WebCite ) (English, pdf). NISA, May 3, 2011, accessed May 6, 2011.
  34. ↑ a b Fukushima Dai-ichi Nuclear Power Station Major Parameters of the Plant (As of 06:00, May 4) ( Memento from May 6, 2011 on WebCite ) (English, pdf). NISA, May 4, 2011, accessed May 6, 2011.
  35. ↑ a b Fukushima Dai-ichi Nuclear Power Station Major Parameters of the Plant (As of 12:00, May 5) ( Memento from May 6, 2011 on WebCite ) (English, pdf). NISA, May 5, 2011, accessed May 6, 2011.
  36. ↑ a b プ ラ ン ト 関 連 パ ラ メ ー タ ( Memento from May 7, 2011 on WebCite ) (Japanese, PDF; 834 kB). Ministry of Economy, Trade and Industry, May 6, 2011, accessed May 6, 2011. Page 4
  37. ↑ a b プ ラ ン ト 関 連 パ ラ メ ー タ ( Memento from May 7, 2011 on WebCite ) (Japanese, PDF; 398 kB). Ministry of Economy, Trade and Industry, May 7, 2011, accessed May 7, 2011. Page 4
  38. ↑ a b Fukushima Dai-ichi Nuclear Power Station Major Parameters of the Plant (As of 6:00, May 8) ( Memento from May 8, 2011 on WebCite ) (English, pdf). NISA, May 8, 2011, accessed May 8, 2011.
  39. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ ( Memento from May 9, 2011 on WebCite ) (Japanese, pdf). Ministry of Economy, Trade and Industry, May 9, 2011, accessed May 9, 2011.
  40. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (Japanese, pdf; 394 kB). Ministry of Economy, Trade and Industry, May 10, 2011, accessed May 10, 2011.
  41. ↑ a b Fukushima Dai-ichi Nuclear Power Station Major Parameters of the Plant ( Memento from May 17, 2011 on WebCite ) (English, pdf). NISA, May 15, 2011, accessed May 16, 2011.
  42. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ ( Memento from May 21, 2011 on WebCite ) (Japanese, PDF; 1.6 MB). Ministry of Economy, Trade and Industry, May 20, 2011, accessed May 20, 2011. Page 6
  43. ^ A b Report of Japanese Government to the IAEA Ministerial Conference on Nuclear Safety - The Accident at TEPCO's Fukushima Nuclear Power Stations - VI 5. Situation of Each Unit etc. at Fukushima NPS (Part 2/2) ( Memento from June 8, 2011 on WebCite ) (English; PDF; 1.4 MB). Kantei / NISA, June 7, 2011, accessed June 8, 2011. Cooling basin temperatures on page IV-108.
  44. ↑ a b c d e f g h i j k Report of Japanese Government to the IAEA Ministerial Conference on Nuclear Safety - The Accident at TEPCO's Fukushima Nuclear Power Stations - IV. Occurrence and Development of the Accident at the Fukushima Nuclear Power Stations ( Memento from June 13, 2011 on WebCite ) (English; PDF; 4.3 MB). Kantei / NISA, June 7, 2011, accessed June 14, 2011.
  45. ↑ Seismic Damage Information (the 95th Release) (“removal of rubble”) ( Memento from April 20, 2011 on WebCite ) (English, pdf). April 15, 2011, accessed April 20, 2011.
  46. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-04-14: 08: 00) ( Memento from April 17, 2011 on WebCite ) (Japanese, PDF; 389 kB). Ministry of Economy, Trade and Industry, April 14, 2011, accessed April 17, 2011. Page 4
  47. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-04-24: 14: 00) ( Memento from April 24, 2011 on WebCite ) (Japanese, PDF; 376 kB). Ministry of Economy, Trade and Industry, April 24, 2011, accessed April 24, 2011. Page 4
  48. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-04-28: 06: 00) ( Memento from May 7, 2011 on WebCite ) (Japanese, PDF; 367 kB). Ministry of Economy, Trade and Industry, April 27, 2011, accessed May 7, 2011. Page 4
  49. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-04-28: 06: 00) ( Memento from April 29, 2011 on WebCite ) (Japanese, PDF; 363 kB). Ministry of Economy, Trade and Industry, April 28, 2011, accessed April 29, 2011. Page 4
  50. ↑ Earthquake Report - JAIF, No. 65 ( Memento from April 27, 2011 on WebCite ) (English, PDF; 103 kB). JAIF / NHK, April 27, 2011, accessed April 27, 2011.
  51. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ (2011-04-29: 13: 00) ( Memento from April 29, 2011 on WebCite ) (Japanese, PDF; 357 kB). Ministry of Economy, Trade and Industry, April 29, 2011, accessed April 29, 2011. Page 4
  52. ↑ Earthquake Report - JAIF, No. 73 ( Memento of May 10, 2011 on WebCite ) (English, PDF; 253 kB). JAIF / NHK, May 6, 2011, accessed May 6, 2011.
  53. ^ Fukushima Dai-ichi Nuclear Power Station Major Parameters of the Plant ( Memento from May 13, 2011 on WebCite ) (English, pdf). NISA, May 12, 2011, accessed May 12, 2011.
  54. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ ( Memento from May 13, 2011 on WebCite ) (Japanese, PDF; 420 kB). Ministry of Economy, Trade and Industry, May 13, 2011, accessed May 13, 2011. Page 4
  55. ^ Fukushima Dai-ichi Nuclear Power Station Major Parameters of the Plant ( Memento from May 17, 2011 on WebCite ) (English, pdf). NISA, May 14, 2011, accessed May 16, 2011.
  56. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ ( Memento from May 17, 2011 on WebCite ) (Japanese, PDF; 418 kB). Ministry of Economy, Trade and Industry, May 16, 2011, accessed May 17, 2011. Page 4
  57. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ ( Memento from May 17, 2011 on WebCite ) (Japanese, PDF; 495 kB). Ministry of Economy, Trade and Industry, May 17, 2011, accessed May 17, 2011. Page 4
  58. ^ Fukushima Dai-ichi Nuclear Power Station Major Parameters of the Plant ( Memento from May 19, 2011 on WebCite ) (English, pdf). NISA, May 18, 2011, accessed May 19, 2011.
  59. ^ Fukushima Dai-ichi Nuclear Power Station Major Parameters of the Plant ( Memento from May 25, 2011 on WebCite ) (English, pdf). NISA, May 24, 2011, accessed May 26, 2011.
  60. ^ Fukushima Dai-ichi Nuclear Power Station Major Parameters of the Plant ( Memento from May 25, 2011 on WebCite ) (English, pdf). NISA, May 25, 2011, accessed May 26, 2011.
  61. ↑ プ ラ ン ト 関 連 パ ラ メ ー タ ( Memento from May 25, 2011 on WebCite ) (Japanese, PDF; 420 kB). Ministry of Economy, Trade and Industry, May 17, 2011, accessed May 26, 2011.
  62. ↑ Earthquake Report - JAIF, No. 52: 20:00, April 14 ( Memento from April 14, 2011 on WebCite ) (English, PDF; 119 kB). JAIF / NHK, April 14, 2011, accessed April 14, 2011.
  63. ↑ a b c Fukushima Nuclear Accident Update (March 16, 2011, 22:00 UTC) ( Memento from April 12, 2011 on WebCite ) (English). IAEA , March 16, 2011, accessed March 24, 2011.
  64. ↑ Seismic Damage Information (the 28th Release) (As of 17:30 March 17th, 2011) ( Memento from April 11, 2011 on WebCite ) (English, pdf). NISA , March 18, 2011, accessed March 18, 2011.
  65. ↑ Seismic Damage Information (the 30th Release) (As of 15:00 March 18th, 2011) ( Memento from May 2, 2011 on WebCite ) (English, pdf). NISA , March 18, 2011
  66. ↑ Seismic Damage Information (the 33rd Release) (As of 13:30 March 19th, 2011) ( Memento from April 12, 2011 on WebCite ) (English, pdf). NISA , March 19, 2011, accessed March 19, 2011.
  67. ↑ a b Seismic Damage Information (the 34th Release) (As of 20:30 March 19th, 2011) ( Memento from April 12, 2011 on WebCite ) (English, pdf). NISA , March 19, 2011, accessed March 20, 2011.
  68. ↑ Seismic Damage Information (the 35th Release) (As of 07:30 March 20th, 2011) ( Memento from April 16, 2011 on WebCite ) (English, pdf). NISA , March 20, 2011, accessed March 20, 2011.
  69. ↑ Seismic Damage Information (the 37th Release) (As of 22:30 March 20th, 2011) ( Memento from April 12, 2011 on WebCite ) (English, pdf). NISA , March 20, 2011, accessed March 20, 2011.
  70. ↑ Seismic Damage Information (the 38th Release) (As of 10:30 March 21st, 2011) ( Memento from April 12, 2011 on WebCite ) (English, pdf). NISA , March 21, 2011, accessed March 21, 2011.
  71. ↑ Seismic Damage Information (the 40th Release (corrected)) (As of 21:00 March 21st, 2011) ( Memento from April 12, 2011 on WebCite ) (English, pdf). NISA , March 21, 2011.
  72. ^ Seismic Damage Information (the 63rd Release) ( Memento from April 12, 2011 on WebCite ) (English, pdf). NISA, March 30, 2011, accessed March 31, 2011.
  73. ↑ a b c d e Seismic Damage Information (the 53rd Release) (As of 08:00 March 26th, 2011) ( Memento from April 12, 2011 on WebCite ) (English, pdf). NISA , March 26, 2011, accessed March 26, 2011.
  74. ↑ Seismic Damage Information (the 54th Release) ( Memento April 10, 2011 on WebCite ) (English, pdf). NISA, March 26, 2011, accessed March 26, 2011.
  75. ↑ Seismic Damage Information (the 57th Release) ( Memento from April 12, 2011 on WebCite ) (English, pdf). NISA, March 27, 2011, accessed April 1, 2011.
  76. ↑ Seismic Damage Information (the 76th Release) ( Memento from April 16, 2011 on WebCite ) (English, pdf). NISA, April 6, 2011, accessed April 16, 2011.
  77. ^ Seismic Damage Information (the 84th Release) ( Memento of April 16, 2011 on WebCite ) (English, pdf). NISA, April 10, 2011.
  78. ↑ Status of nuclear power plants in Fukushima as of 22:00 March 17 (Estimated by JAIF) ( Memento from April 16, 2011 on WebCite ) (English, PDF; 232 kB). Japan Atomic Industrial Forum, March 17, 2011, accessed March 17, 2011.
  79. ^ State of the nuclear power plant in Fukushima No. 1 (Daiichi) on March 17, 2011 at 2:00 p.m. (CET) ( Memento from April 16, 2011 on WebCite ) (PDF; 124 kB). Society for Plant and Reactor Safety , March 17, 2011, accessed on March 17, 2011.
  80. ↑ Status of nuclear power plants in Fukushima as of 21:00 March 22 (Estimated by JAIF) ( Memento from April 16, 2011 on WebCite ) (English, PDF; 166 kB). Japan Atomic Industrial Forum, March 22, 2011, accessed March 22, 2011.
  81. ^ State of the nuclear power plant in Fukushima No. 1 (Daiichi) on March 22, 2011 at 1:00 p.m. (CET) . ( Memento from April 16, 2011 on WebCite ) Society for Plant and Reactor Safety (PDF; 267 kB), March 22, 2011, accessed on March 22, 2011.
  82. ↑ Status of nuclear power plants in Fukushima as of 21:00 March 30 (Estimated by JAIF) ( Memento from April 16, 2011 on WebCite ) (English, PDF; 270 kB). Japan Atomic Industrial Forum, March 30, 2011, accessed March 30, 2011.
  83. ^ State of the nuclear power plant in Fukushima No. 1 (Daiichi) on March 30, 2011 at 2:00 p.m. (CEST) . ( Memento from April 16, 2011 on WebCite ) Society for Plant and Reactor Safety (PDF; 197 kB), March 30, 2011, accessed on March 30, 2011.
  84. ↑ Status of nuclear power plants in Fukushima as of 20:00 April 12th (Estimated by JAIF) ( Memento from May 2, 2011 on WebCite ) (English). Japan Atomic Industrial Forum, March 30, 2011, archived from the original ( May 2, 2011 memento on WebCite ) on May 2, 2011, retrieved March 30, 2011.
  85. ^ State of the nuclear power plant in Fukushima No. 1 (Daiichi) on April 12, 2011 at 9:00 a.m. (CEST) . ( Memento from May 2, 2011 on WebCite ) (PDF; 246 kB) Society for Plant and Reactor Safety, April 12, 2011, accessed on April 12, 2011.
  86. ↑ a b The data of Unit 1 to 3 of Fukushima Daiichi Nuclear Power Station measured by CAMS and erratum sheet of core damage ratio ( Memento from April 27, 2011 on WebCite ) (English, PDF; 51 kB). Tepco, April 27, 2011, accessed April 27, 2011.
  87. ↑ Status of nuclear power plants in Fukushima as of 12:00 April 28th (Estimated by JAIF) ( Memento from May 2, 2011 on WebCite ) (English; PDF; 275 kB). Japan Atomic Industrial Forum, May 2, 2011, accessed May 2, 2011.
  88. ^ State of the nuclear power plant in Fukushima No. 1 (Daiichi) on April 12, 2011 at 9:00 a.m. (CEST) . ( Memento from May 2, 2011 on WebCite ) (PDF; 246 kB) Society for Plant and Reactor Safety, April 12, 2011, accessed on April 12, 2011.

Coordinates: 37 ° 25 '17 "  N , 141 ° 1' 57"  E