The Tomari Nuclear Power Plant is the only nuclear power plant in Hokkaidō, Japan. It is located in the town of Tomari in the Furuu District and managed by the Hokkaido Electric Power Company. All of the reactors are Mitsubishi designs. The Tomari Nuclear Power Plant was originally going to be located on an island and be named the Kyowa-Tomari NPP, but there was a change in plans and the location and name was changed.

Reactors on Tomari Nuclear Power Plant

Unit	Type	Commission date	Electric Power
Tomari - 1	PWR	June 22, 1989	579 MW
Tomari - 2	PWR	April 12, 1991	579 MW
Tomari - 3	PWR	December 22, 2009	912 MW

Events

• In 2000, a worker fell into a sump tank in the chemical control system of the plant. The worker received a high radiation dose and died in the hospital later.
• In September 2003, there was a leak in the steam generator causing about 140 liters of primary coolant to leak.
• In May 2005, there was a trespassing event where someone crossed the fence into the property. Some people had apparently been gathering bamboo sticks as a part of a part time job and when discovered, 24 arrests were made. There were all questioned due to strong concerns about terrorism at the plant.
• Also in 2005, company sensitive information was leaked from a worker's computer by a virus.
• In July 2007, there were three separate fires related to the new unit that was under construction. Electrical wiring had apparently been cut and foul play was expected. Coming just days after a more serious earthquake caused events at the Kashiwazaki-Kariwa plant, it dealt a further blow to Japan's nuclear power industry.
• On September 29, 2007, Kazutoshi Michinaka reported that there was no radiation leakage, and no one was hurt in the small fire at the half-built third reactor at Tomari Nuclear Power Plant, Hokkaidō, Japan At least 7 arson cases have been reported at the construction site this year.

Tomari Nuclear Power Plant
Country	Japan
Construction began	April 18, 1985 (1985-04-18)
Commission date	June 22, 1989 (1989-06-22)
Operator(s)	Hokkaido Electric Power Company
Reactor information
Reactors operational	2 x 579 MW 1 x 912 MW
Power generation information
Annual generation	8,554 GW·h
Net generation	138,706 GW·h

Fukushima 1 Nuclear Accident Day 9: Saturday, 19 March 2011

00:45

Water dousing resumes on Unit 3 by hyper rescue troop with the cooperation of Tokyo Fire Department. Finished at 01:10.

12:50

Power line is connected to power plant but not activated yet.

19:07

Milk and spinach from areas around power plant have been found with radiation level exceed Japan's standards. Japan government halt sales of all food from Fukushima prefecture.

Status of Fukushima I at 10:00 on 19 March

	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	33% damaged	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	Might not be 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	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 (SFP)	Water injection to be considered	(no data)	SFP level low, Water injection continues	SFP level low, Preparing water injection, Hydrogen from SFP exploded	SFP temperature increasing	SFP temperature increasing
Environmental effect (NPS border)	304 µSv/hour at 3:30, 19 March
Evacuation radius	20 km from Nuclear Power Station (NPS). 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 Japanese NISA and accepted by the international IAEA); Level 6 (estimated by the French Nuclear Safety Authority, ASN); Unit 4, Level 3

22:21

Radioactive iodine in trace amounts have been found in tap water in Tokyo and 5 other areas near Fukushima; and caesium-137 trace amounts have been found in Tochigi and Gunma prefectures. The Japanese government says the amounts did not exceed safety limits and should not affect human health.

23:52

Radioactive iodine beyond limit detected in tap water in a town in Fukushima, reports Kyodo News with reference to government.

Fukushima 1 Nuclear Accident Day 8: Friday, 18 March

01:55

Engineers have begun laying power grid cabling to unit 2. Power to unit 2 will be reconnected once the spraying of water on the unit 3 reactor building ceases.

03:00

The IAEA announce the termperature at the spent fuel pond at reactor 5 is 65.5 °C and the temperature of the spent fuel pond at reactor 6 is 62.0 °C a slight decrease since yeterday at reactor 6 and a slight increase since yesterday at reactor 5

04:33

BBC reports with reference to UN's nuclear watchdog that reactor 2 is connected to power line. It may allow operators to restart Emergency Core Cooling System and Residual Heat Removal pumps for the reactor.

05:30

TEPCO reports that laying of grid cabling to Unit 2 continues. The United States military is using unmanned aerial vehicles to view the reactor.

11:00

The United States is sending water pumps to Japan.

14:00

Water dousing resumes on unit 3 by the Japan Self-Defense Forces (SDF), rotating with the Tokyo Fire Department (TFD), which is also managing unit 1.

16:00

Status of Fukushima I at 16:00 March 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	33% damaged	Damaged	No fuel rods	Not damaged	Not damaged
Containment integrity	Not damaged	Damage suspected	Might not be 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	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 (SFP)	Water injection to be considered	(no data)	SFP level low, Water injection continue	SFP level low, Preparing water injection, Hydrogen from SFP exposed	SFP temperature increasing, 65.5 °C	SFP temperature decreasing, 62.0 °C
Environmental effect (NPS border)	271 µSv/hour at 7:30 p.m., March 18
Evacuation radius	20 km from Nuclear Power Station (NPS). People who live between 20 km to 30 km from the Fukushima I Nuclear Power Station are to stay indoors.
INES	Level 5 (estimated by Japanese NISA and accepted by the international IAEA); Level 6 (estimated by the French Nuclear Safety Authority, ASN and the Finnish nuclear authorities)

18:40

IAEA raises INES level from 4 to 5. Radiation reading 1km from reactor #2 - 292.2 µSv/hour

22:00

A plume model shows that the movement of the radioactive material is primarily across the ocean.

Fukushima 1 Nuclear Accident Day 7: Thursday, 17 March

01:37

The Australian Department of Foreign Affairs and Trade issued a Travel Advice Bulletin advising Australian travellers to reconsider the need to travel to Tokyo, the surrounding earthquake-affected districts, Chiba, Fukushima, Aomori, Iwate, Nagano, Niigata and Ibaraki prefectures and not to travel to the Fukushima Nuclear Power Plant exclusion zone and Miyagi Prefecture.

03:50

IAEA Director announces he will travel to Japan to "see the situation for himself".

04:00

The US Embassy, on advice from the Nuclear Regulatory Commission, told Americans to evacuate a radius of "approximately 50 miles (80 km)" from the Fukushima plant.

05:25 (approximately)

The head of the U.S. Nuclear Regulatory Commission, Gregory Jaczko, said that the fuel pool at unit 4 had run dry and as a result, radiation levels at the plant were "extremely high". TEPCO denied that the pool had run dry and said "the condition is stable" at unit 4.

09:00

Radiation levels in cities near Fukushima I plant: 13.9 µSv at Fukushima City, 65 km northwest; 2.71 µSv at Kooriyama city, 60 km west; 1.25 µSv at Iwaki city, 40 km southwest.

09:19 (approximate)

Naoki Tsunoda, a TEPCO spokesman, indicates that the new power lines to the plant were almost finished and that officials planned to try it "as soon as possible." Kyodo said that could be as early as Thursday afternoon.

09:48

Japan's Self Defense Force used CH-47 helicopters to perform water spraying operations on reactor unit 3. JAIF reported that the helicopter had been specially modified with lead shielding to protect the personnel onboard. However, much of the water appeared to be dispersed in the wind before reaching its target.

10:00

Helicopter based spraying operations were halted after 4 water drops were performed on unit 3. Japanese newscaster NHK indicated that spraying operations will continue from the ground and that personnel are monitoring the radiation levels around the base.

10:15

The IAEA releases a summary of all injuries and contaminations due to the situation at the Fukushima I nuclear plant. It indicates that 23 people were injured, more than 20 were contaminated, and 2 are missing.

10:40

JAIF reports that the radiation levels at the main gate are 10 millisieverts per hour.

11:05

The Japanese nuclear safety agency says external power to the plant should partially resume later in the day.[Kyodo News]

11:10

Radiation reading at the Fukushima I Nuclear Power Station (NPS) border is 646 µSv/hour.

12:00

The IAEA announce that the temperature in spent fuel pond at reactor 5 is 64.2 °C and the spent fuel pond at reactor 6 is 62.5 °C

12:07

Cabinet Secretary Edano says Unit 3 is the top priority for cooling efforts [Kyodo News]

16:00

The Japan Times reports that radiation levels at the main gate drop to 1.5 millisieverts per hour. Additionally, after hours of conflicting reports on the cause of the white smoke emitting from unit 3, Chief Cabinet Secretary Yukio Edano corrects an earlier statement and now believes that the smoke is being relased from the storage pool at unit 3, and not the containment vessel.

16:00

Status of Fukushima I at 16:00 March 17

	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	33% damaged	Damaged	No fuel rods	Not damaged	Not damaged
Containment integrity	Not damaged	Damage suspected	Damage suspected, but considered to be unlikely.	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 (SFP)	(no data)	(no data)	SFP level low, Preparing water injection	SFP level low, Preparing water injection, Damage to fuel rods suspected	SFP temperature increasing	SFP temperature increasing
Environmental effect (NPS border)	646 µSv/hour at 11:10, March 17
Evacuation radius	20 km from Nuclear Power Station (NPS). People who live between 20 km to 30 km from the Fukushima I Nuclear Power Station are to stay indoors.
INES	Level 4 (estimated by Japanese NISA and accepted by the international IAEA); Level 6 (estimated by the French Nuclear Safety Authority, ASN and the Finnish nuclear authorities)

17:00

South Korean foreign minister Kim Sung-hwan urged South Koreans in Japan to stay 80 kilometers outside the earthquake-stricken nuclear complex in Fukushima.

17:30

Rewiring unit 2 to the Japanese power grid was completed at 08:30 UTC and IAEA indicates that Power will be turned on once the spraying of unit 3 is completed.

19:25

Workers begin spraying water from "special pumper trucks" similar to those used for aircraft fires onto unit 3.

22:00

Status of Fukushima I at 22:00 March 17

	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	33% damaged	Damaged	No fuel rods	Not damaged	Not damaged
Containment integrity	Not damaged	Damage suspected	Damage suspected, but considered to be unlikely.	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 (SFP)	(no data)	(no data)	SFP level low, Starting water injection	SFP level low, Preparing water injection, Damage to fuel rods suspected	SFP temperature increasing, 64.2 °C	SFP temperature increasing, 62.5 °C
Environmental effect (NPS border)	309 µSv/hour at 15:30, March 17
Evacuation radius	20 km from Nuclear Power Station (NPS). People who live between 20 km to 30 km from the Fukushima I Nuclear Power Station are to stay indoors.
INES	Level 4 (estimated by Japanese NISA and accepted by the international IAEA); Level 6 (estimated by the French Nuclear Safety Authority, ASN and the Finnish nuclear authorities)

20:09

Workers finish successfully spraying 30 tons of water from pumper trucks onto Unit 3, and TEPCO is now evaluating the effectiveness of the operation. IAEA indicates that the spraying of water on the Unit 3 reactor building was temporarily stopped.

22:37

Reuters reports that work has started to connect outside power lines to the Fukishima I nuclear power plant. Unit 2 will be the first to receive electricity. The earliest this could happen is Friday.

Fukushima 1 Nuclear Accident Day 6: Wednesday, 16 March

05:45

A location in the building of reactor 4 has been reported to be on fire at the Fukushima I (by NHK TV). According to one of the worker's testimony, flames were present at the location of Tuesday's fire. The fire was verified by satellite imagery showing smoke rising from the reactor 4 building. The fire disappeared later. IAEA confirms reports that a fire was visually observed in unit 4, in a similar area as the original fire. This new fire cast into doubt the earlier hope that the Tuesday blaze in the Unit 4 housing was caused by lubricating oil pumps; instead TEPCO officials acknowledge it is possible the spent fuel rods are uncovered and overheating, remarking that "the possibility of a re-criticality is not zero." Iouli Andreev, former director of the Soviet Spetsatom clean-up agency involved in Chernobyl clean-up, as well as Laurence Williams, professor of nuclear safety at the University of Central Lancashire, speculate that the Fukushima management had engaged in an unsafe practice of re-racking spent rods in the pool well beyond its rated capacity, in effect heightening danger of melting and pool boil-off.

06:15

IAEA Reports that the fire previously observed in unit 4 is no longer visible.

07:30

Evacuation of the 20km zone around Fukushima I has been completed.

08:00 (approximately)

The US Embassy in Japan is recommending that all personnel to adhere to the Japanese safety measures, "including their recommended 20 km radius for evacuation and additional shelter-in-place recommendations out to 30 km."

08:00

Status of the Fukushima I station at 08:00 March 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	33% damaged	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	SFP level decreasing	SFP level decreasing
Environmental effect (NPS border and onsite)	6308 μSv/hour at 23:35, March 15, with increases to 1,000 mSv/hour early March 16 and then decreasing to 800–600 mSv/hour
Evacuation radius	20 km
INES	Level 4 (estimated by NISA); Level 6 (estimated by France's Nuclear Safety Authority, ASN)

08:30

White smoke was seen rising from the vicinity of Fukushima I Unit 3. Damage to the containment vessel of the unit was suspected. Later TEPCO reported that failing to cool the Spent Fuel Pool resulted in evaporation of pool water, which caused steam.

09:00

The fire that broke out inside the building of Fukushima I reactor 4 appears to be extinguished. According to Kyodo News, TEPCO is considering spraying boric acid by helicopter to prevent the spent nuclear fuel rods from reaching criticality again and starting a nuclear chain reaction. However, TEPCO said that readings showed high levels of radiation, making the building inaccessible, and therefore making the spraying "extremely difficult".

10:01 (estimated)

Reactor 3 at Fukushima I nuclear power plant begins emitting white smoke.

10:46

TEPCO says the reactor 3 at Fukushima I nuclear power plant has been emitting white smoke for about 45 minutes.

11:00

Radiation reading at the Fukushima I Nuclear Power Station (NPS) border is 3391 µSv/hour

11:36

The remaining 50 workers located in the Fukushima I nuclear power plant have evacuated after radiation levels there have surged.

11:40

Chief cabinet secretary Edano announces that the white fumes emerging from the plant may constitute radioactive steam that has breached Fukushima I Unit 3's containment.

12:30

Status of the Fukushima I station at 12:30 March 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	33% damaged	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 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)	High temperature suspected	SFP level low, Preparing water injection, Damage to fuel rods suspected	SFP temperature increasing	SFP temperature increasing
Environmental effect (NPS border)	3391 µSv/hour at 11:00, March 16
Evacuation radius	20 km from Nuclear Power Station (NPS)
INES	Level 4 (estimated by Japanese NISA and accepted by the international IAEA); Level 6 (estimated by the French Nuclear Safety Authority, ASN and the Finnish nuclear authorities)

12:35 (approximate)

The 50 personnel that were evacuated at 1136 returned to the facility after radiation levels subsided.

14:30

Radiation reading at the Fukushima I Nuclear Power Station (NPS) border is 1937 µSv/hour.

17:26

TEPCO says that work on cooling the Fukushima I reactors is suspended due to radiation risks for the second time.

18:00

Radiation decreased to 1500 µSv/hour at Fukushima I site boundary (NHK TV). See also this map of various detectors stationed around Japan (owned by public and government).

19:00

The Fukushima I Unit 3 Spent Fuel Pool level is low, with preparations for water injection.

19:00

Status of Fukushima I at 19:00 March 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	33% damaged	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 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
Integrity of fuel in Spent Fuel Pool (SFP)	(no data)	(no data)	SFP level low, Preparing water injection	SFP level low, Preparing water injection, Damage to fuel rods suspected	SFP temperature increasing	SFP temperature increasing
Environmental effect (NPS border)	1937 µSv/hour at 14:30, March 16
Evacuation radius	20 km from Nuclear Power Station (NPS). People who live between 20km to 30km from the Fukushima I Nuclear Power Station are to stay indoors.
INES	Level 4 (estimated by Japanese NISA and accepted by the international IAEA); Level 6 (estimated by the French Nuclear Safety Authority, ASN and the Finnish nuclear authorities)

19:50

Radiation level at Fukushima II reactor (10km south of Fukushima I): 28.6 µSv/hour. ref

21:05

Australian Foreign Minister Kevin Rudd advises Australians to leave Tokyo.

23:30

130 additional people are allowed in the plant as radiation levels fall.

23:55

IAEA Web Site Reports that "Japanese authorities have reported concerns about the condition of the spent nuclear fuel pool at Fukushima I Unit 3 and Unit 4. Japanese Defense Minister Toshimi Kitazawa announced Wednesday that Special Defence Forces helicopters planned to drop water onto Unit 3, and officials are also preparing to spray water into Unit 4 from ground positions, and possibly later into Unit 3. Some debris on the ground from the 14 March explosion at Unit 3 may need to be removed before the spraying can begin."