March 11th, 2011 – NEWS Event Detail – Fukushima Daiichi

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Event Title: Effect to the Nuclear Facilities from the earthquake on east area of Japan
Event Date: 2011-03-11 Date Sent: 2011-03-12 00:41:00 UTC
Location/Facility: FUKUSHIMA-DAIICI-1,2 I Event Type: Power Reactor
FUIKUSHIMA-DAINI-1, Japan
Country: Japan Reactor Type: Boiling Water Reactors
Event Sender: Masahiro Yagi _INES Rating: 3
Event Abstract:
14:46 (UTC 5:46) March 11, an earthquake hit east area of Japan. Summary of earthquake and
current status of each nuclear facility is as follows;
1. Summary of Earthquake
(1) Time of Occurrence: 14:46 (UTC 5:46) March 11,2011, Friday
(2) Epicenter: Off-Coast of Sanriku (North Latitude: 38; East Longitude: 142.9), 10km deep, M8.8
2. The status of operation at Power Stations(Number of automatic shutdown(units): 10 (as of
00:30(UTC:1 1:46), March12)
a. Onagawa Nuclear Power Station (Onagawa-machi and Ishinomaki-shi, Miyagi Prefecture)
(1) The status of operation
Unit 1 (524MWe): automatic shutdown
Unit 2 (825MWe): automatic shutdown
Unit 3 (825MWe): automatic shutdown
(2) Readings of monitoring post etc.
Variation in the monitoring post readings: No
Variation in the main stack monitor readings: No
(3) Report concerning other malfunction
Report of fire: C02 extinguishment started at 17:15
b. Fukushima Dai-ichi Nuclear Power Station, Tokyo Electric Power Co.,Inc.(TEPCO) (Okumamachi
and Futaba-machi, Futaba-gun, Fukushima Prefecture)
(1) The status of operation
Unit 1 (460MWe): automatic shutdown
Unit 2 (784MWe): automatic shutdown
Unit 3 (784MWe): automatic shutdown
Unit 4(784MW): in periodic inspection outage
Unit 5(784MW): in periodic inspection outage
Unit 6(1,100MW): in periodic inspection outage
(2) Readings at monitoring post etc.
Variation in the monitoring post readings: No
Variation in the main stack monitoring readings: No
(3) Report concerning other malfunction
Article 10* of Act on Special Measures Concerning Nuclear Emergency Preparedness (Fukushima
Dai-ichi, Unit 3)
(*A heightened alert condition)
Article 15** of Act on Special Measures Concerning Nuclear Emergency Preparedness
(Fukushima Dai-ichi, Units 1 and 2)
(** Nuclear emergency situation)
Situation of power source to recover water injection function at the Station.
Three or four electric power source cars are waiting in the premise. Part of cable was obtained and
connecting work is under way. This work is done with paying attention to tsunami. (2:00, March 12)
Pressure in the Confinement Vessel has arisen. The pressure could have arisen to 600kPa as
compared to the design pressure of 400kPa.
c. Fukushima-Daini Nuclear Power Station(TEPCO)
(Naraha-cho/Tomioka-cho, Futaba-gun, Fukushima pref.)
(1) The status of operation
Unitl (1,100MW): automatic shutdown
Unit2(1,100MW): automatic shutdown
Unit3(1,100MW): automatic shutdown
Unit4(1,100MW): automatic shutdown
(2) Readings at monitoring post etc.
Variation in the monitoring post readings: No
Variation in the main stack monitoring readings: No
(3) Report concerning other malfunction
Report of fire: No
Article 10* of Act on Special Measures Concerning Nuclear Emergency Preparedness (Fukushima
Dai-ni, Units 1,2 and 4)
(*A heightened alert condition)
Nuclear Events Web-based System (NEWS)
Event Detail
Event Title: Abnormal rise of radioactive dosage value at site boundary (INES Level 4)
Event Date: 2011-03-12 Date Sent: 2011-03-12 15:05:00 UTC
Location/Facility:FUKUSHIMA-DAIICHI-I Event Type: Power Reactor
Country: Japan Reactor Type: Boiling Water Reactors
Event Sender: Masahiro Yagi INES Rating: 5
Event Abstract:
The core damage by loss of all cooling function due to the big tsunami.-Provisional 2
Fukushima Dai-ichi Nuclear Power Station Unit 1, 2 and 3, which is in rated power operation, have
automatically shut down around 14:46 (JST) in March 11, 2011 because of the Tohoku regional Pacific
Ocean Offshore Earthquake.
After that, the power station was attacked by tsunami.
Electricity rooms and seawater pump rooms were flooded, and the cooling function became only the coolant
injection of the turbine driven pump. The turbine driven pump operation increased the pressure of the
suppression chamber, and it became impossible to continue the operation.
It means loss of all cooling function, and the declaration of a state of emergency was done.
The release valve was opened several times and injections of the sea water into the reactor vessel were
carried out with fire extinguishing pumps. The gas in the containment vessel was also vented.
Then, the radioactive dose rate at site boundary had exceeded the limit value of 0.5 mSv/h.
This value is thought smaller than the value resulting in the release of a few per cent of core inventory of a
power reactor from the fuel assemblies.
But the radioactive dose rate at the suppression chamber was high. And it is thought that hydrogen gas was
generated enough to damage the reactor building.
The behavior of the pressure of the reactor vessel and the containment vessel, and the behavior of the water
level of the reactor vessel were complicated. Some measurements were not possible because of failures of
measurement equipment. As a result, the detailed estimate can not be done.
But these values are thought the values resulting in the release of more than a few per cent of core inventory
of a power reactor from the fuel assemblies.
The inhabitants of the range of 20 km took refuge. At least, one worker received a dose (about 106 mSv) in
excess of the annual limit (100 mSv). But we can not rate on impact on people and the environment because
the correspondence work still continues.
Nuclear Events Web-based System (NEWS)
Event Detail
rEvent Title: Abnormal rise of radioactive dosage value at site boundary (INES Level 4)
Event Date: 2011-03-12 E a1Date Sent: 2011-03-12 15:05:00 UTC
Location/Facility:FUKUSHTMA-DAIICHI-I Event Type: Power Reactor
Country: Japan Reactor Type: Boiling Water Reactors
Event Sender: Masahiro Yagi INES Rating: 5
Event Abstract:
The core damage by loss of all cooling function due to the big tsunami.-Provisional 2
Fukushima Dai-ichi Nuclear Power Station Unit 1, 2 and 3, which is in rated power operation, have
automatically shut down around 14:46 (JST) in March 11, 2011 because of the Tohoku regional Pacific
Ocean Offshore Earthquake.
After that, the power station was attacked by tsunami.
Electricity rooms and seawater pump rooms were flooded, and the cooling function became only the coolant
injection of the turbine driven pump. The turbine driven pump operation increased the pressure of the
suppression chamber, and it became impossible to continue the operation.
It means loss of all cooling function, and the declaration of a state of emergency was done.
The release valve was opened several times and injections of the sea water into the reactor vessel were
carried out with fire extinguishing pumps. The gas in the containment vessel was also vented.
Then, the radioactive dose rate at site boundary had exceeded the limit value of 0.5 mSv/h.
This value is thought smaller than the value resulting in the release of a few per cent of core inventory of a
power reactor from the fuel assemblies.
But the radioactive dose rate at the suppression chamber was high. And it is thought that hydrogen gas was
generated enough to damage the reactor building.
The behavior of the pressure of the reactor vessel and the containment vessel, and the behavior of the water
level of the reactor vessel were complicated. Some measurements were not possible because of failures of
measurement equipment. As a result, the detailed estimate can not be done.
But these values are thought the values resulting in the release of more than a few per cent of core inventory
of a power reactor from the fuel assemblies.
The inhabitants of the range of 20 km took refuge. At least, one worker received a dose (about 106 mSv) in
excess of the annual limit (100 mSv). But we can not rate on impact on people and the environment because
the correspondence work still continues.
Nuclear Events Web-based System (NEWS)
Event Detail
Event Title: The core damage by loss of all cooling function due to the big tsunami.
Event Date: 2011-03-11 Date Sent: 2011-03-18 09:51:00 UTC
Location/Facility:FUKUSHIMA-DAIICHI-2 T Event Type: Power Reactor
Country: Japan
Event Sender: Masahiro Yagi
Reactor Type: Boiling Water Reactors
INES Rating: 5
Event Abstract:
Fukushima Dai-ichi Nuclear Power Station Unit 1, 2 and 3, which is in rated power operation, have
automatically shut down around 14:46 (JST) in March 11, 2011 because of the Tohoku regional Pacific
Ocean Offshore Earthquake.
After that, the power station was attacked by tsunami.
Electricity rooms and seawater pump rooms were flooded, and the cooling function became only the coolant
injection of the turbine driven pump. The turbine driven pump operation increased the pressure of the
suppression chamber, and it became impossible to continue the operation.
It means loss of all cooling function, and the declaration of a state of emergency was done.
The release valve was opened several times and injections of the sea water into the reactor vessel were
carried out with fire extinguishing pumps. The gas in the containment vessel was also vented.
Then, the radioactive dose rate at site boundary had exceeded the limit value of 0.5 mSv/h.
This value is thought smaller than the value resulting in the release of a few per cent of core inventory of a
power reactor from the fuel assemblies.
But the radioactive dose rate at the suppression chamber was high. And it is thought that hydrogen gas was
generated enough to damage the reactor building.
The behavior of the pressure of the reactor vessel and the containment vessel, and the behavior of the water
level of the reactor vessel were complicated. Some measurements were not possible because of failures of
measurement equipment. As a result, the detailed estimate can not be done.
But these values are thought the values resulting in the release of more than a few per cent of core inventory
of a power reactor from the fuel assemblies.
The inhabitants of the range of 20 km took refuge. At least, one worker received a dose (about 106 mSv) in
excess of the annual limit (100 mSv). But we can not rate on impact on people and the environment because
the correspondence work still continues.
Nuclear Events Web-based System (NEWS)
Event Detail
Event Title: The core damage by loss of all cooling function due to the big tsunami.
Event Date: 2011-03-11 Date Sent: 2011-03-18 09:56:00 UTC
Location/Facility:FUKUSHIMA-DAIICHI-3 Event Type: Power Reactor
Country: Japan - Reactor Type: Boiling Water Reactors
Event Sender: Masahiro Yagi INES Rating: 5
Event Abstract:
Fukushima Dai-ichi Nuclear Power Station Unit 1, 2 and 3, which is in rated power operation, have
automatically shut down around 14:46 (JST) in March 11, 2011 because of the Tohoku regional Pacific
Ocean Offshore Earthquake.
After that, the power station was attacked by tsunami.
Electricity rooms and seawater pump rooms were flooded, and the cooling function became only the coolant
injection of the turbine driven pump. The turbine driven pump operation increased the pressure of the
suppression chamber, and it became impossible to continue the operation.
It means loss of all cooling function, and the declaration of a state of emergency was done.
The release valve was opened several times and injections of the sea water into the reactor vessel were
carried out with fire extinguishing pumps. The gas in the containment vessel was also vented.
Then, the radioactive dose rate at site boundary had exceeded the limit value of 0.5 mSv/h.
This value is thought smaller than the value resulting in the release of a few per cent of core inventory of a
power reactor from the fuel assemblies.
But the radioactive dose rate at the suppression chamber was high. And it is thought that hydrogen gas was
generated enough to damage the reactor building.
The behavior of the pressure of the reactor vessel and the containment vessel, and the behavior of the water
level of the reactor vessel were complicated. Some measurements were not possible because of failures of
measurement equipment. As a result, the detailed estimate can not be done.
But these values are thought the values resulting in the release of more than a few per cent of core inventory
of a power reactor from the fuel assemblies.
The inhabitants of the range of 20 km took refuge. At least, one worker received a dose (about 106 mSv) in
excess of the annual limit (100 mSv). But we can not rate on impact on people and the environment because
the correspondence work still continues.
Nuclear Events Web-based System (NEWS)
Event Detail
Event Title: Loss of cooling function and water supplying function on the spent fuel pool due to the big
tsunami.
Event Date: 2011-03-11 iDate Sent: 2011-03-18 10:05:00 UTC
Location/Facility:FUKUSHIMA-D
FCountry: Japan
AIICHI-4 Event Type: Power Reacto r
Reactor Type: Boiling Water Reactors
INES Rating: 3
_____
Event Sender: Masahiro Yagi
Event Abstract:
Fukushima Dai-ichi Nuclear Power Station Unit 4, which was in shutdown mode, was attacked by the
Tohoku regional Pacific Ocean Offshore Earthquake around 14:46 (JST) in March 11, 2011.
After that, the power station was attacked by a tsunami.
Electricity rooms and seawater pump rooms were flooded, and the cooling function and water supplying
function on the spent fuel pool became inoperable. The temperature of the spent fuel pool has been
increasing, and the water level of the spent fuel pool was thought to be decreasing.
The water in the spent fuel pool boiled by residual heat of spent fuels, and the reactor building was damaged
by an explosion which seems to be a hydrogen explosion.
It is carrying out to pour the sea water for cooling spent fuels.
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