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March 12, 2011

Fukushima Daini Nuclear Power Station all shutdown

Tokyo Electric reports the four Fukushima Daini reactors were shutdown

UPDATE- Despite being shutdown -there are still preparations being made for a pressure release.


Unit 1 (shut down at 2:48PM on March 11th)
- Reactor is shut down and reactor water level is stable.
- Offsite power is available.
- Control rods are fully inserted (reactor is in subcritical status)
- Status of main steam isolation valve: closed
- Injection of water into the reactor had been done by the Reactor Core
Isolation Cooling System, but at 3:48AM, injection by Make-up Water
Condensate System begun
- At 6:08PM, we announced the increase in reactor containment vessel pressure,
assumed to be due to leakage of reactor coolant. However, we do not believe
there is leakage of reactor coolant in the containment vessel at this moment.

Unit 2 (shut down at 2:48PM on March 11th)
- Reactor is shut down and reactor water level is stable.
- Offsite power is available.
- Control rods are fully inserted (reactor is in subcritical status)
- Status of main steam isolation valve: closed
- Injection of water into the reactor had been done by the Reactor Core
Isolation Cooling System, but at 4:50AM, injection by Make-up Water
Condensate System begun.
- We do not believe there is leakage of reactor coolant in the containment
vessel.

Unit 3 (shut down at 2:48PM on March 11th)
- Reactor is shut down and reactor water level is stable.
- Offsite power is available.
- Control rods are fully inserted (reactor is in subcritical status)
- Status of main steam isolation valve: closed
- Reactor Core Isolation Cooling System is turned off. Currently, injection
of water into the reactor is done by Make-up Water Condensate System.
- We do not believe there is leakage of reactor coolant in the containment
vessel.

Unit 4 (shut down at 2:48PM on March 11th)
- Reactor is shut down and reactor water level is stable.
- Offsite power is available.
- Control rods are fully inserted (reactor is in subcritical status)
- Status of main steam isolation valve: closed
- Reactor Core Isolation Cooling System is turned off. Currently, injection
of water into the reactor is done by Make-up Water Condensate System.
- We do not believe there is leakage of reactor coolant in the containment
vessel.

Indication from monitoring posts installed at the site boundary did not show
any difference from ordinary level.
No radiation impact to the external environment has been confirmed. We will
continue to monitor in detail the possibility of radioactive material being
discharged from exhaust stack or discharge canal.
There is no missing person within the power station.
We are presently checking on the site situation of each plant while keeping
the situation of aftershock and Tsunami in mind.
A seriously injured worker is still trapped in the crane operating console
of the exhaust stack and his breathing and pulse cannot be confirmed.
A worker was lightly injured spraining his left ankle and cutting both knees
when he fell while walking at the site. The worker is conscious.



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