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Press Release (Mar 11,2011)
Occurrence of a Specific Incident Stipulated in Article 10, Clause 1 of the Act on Special Measures Concerning Nuclear Emergency Preparedness(Fukushima Daini)
Today at 2:46PM, turbines and reactors of Tokyo Electric Power Company's 
Fukushima Daini Nuclear Power Station Units 1 to 4 (Boiling Water Reactor, 
rated output 1,100 Megawatts) that had been operating at rated power 
automatically shutdown due to the Miyagiken-oki Earthquake.

Currently, reactor water level for Units 1 to 4 is maintained by injecting 
water into the reactors by the Reactor Core Isolation Cooling System.  
The reactors are maintained at a subcritical condition.

For Unit 1, the emergency core cooling system automatically started up 
due to increase in the reactor containment pressure assumed to be caused 
by leakage of reactor coolant in the reactor containment.

Hence, at 5:35PM, it was decided that a specific incident stipulated in 
Article 10, Clause 1 of the Act on Special Measures Concerning Nuclear 
Emergency Preparedness *1 has occurred.

At 5:50PM, pursuant to the Act, relevant governmental institutions were 
notified of the incident.

Future Actions:
TEPCO is taking measures to reduce the pressure of the reactor containment.

Impact to safety and external environment:
Water level to cool the irradiated nuclear fuel in the reactor core is 
maintained at this moment.
Indication of the monitoring posts installed in the periphery of the power 
station is no different from usual and thus no radiation impact to the 
external environment is confirmed at this moment.
We will continue to monitor in detail the possibility of discharge of 
radioactive material from exhaust stacks and coolant water discharge canal.

*1 Specific Incident Stipulated in Article 10, Clause 1 of the Act on 
   Special Measures Concerning Nuclear Emergency Preparedness

   The objective of the Act on Special Measures Concerning Nuclear 
   Emergency Preparedness is to protect the welfare, physical wellbeing 
   and property of Japan's citizens.  To this end, when accidents and 
   equipment breakdown have reached certain levels at nuclear power plants, 
   the Act obligates us to notify the nation, prefectures, cities and towns 
   in order for them to take necessary actions and to grasp information in 
   a timely manner. 
   Notifications are issued out under circumstances such as when the nuclear 
   reactor cannot be shut down and/or when the water supply to the reactor 
   is cut off.

*2 Monitoring Post
   Equipment to measure the radiation level in the atmosphere. Seven units 
   are installed in the periphery of the power station. 
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