March 13th 2011 – Detailed Report of Plant Status At Fukushima Daini As of 2:00 AM March 14th JST

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From: Nichols, Craio (GE Power & Water)
To: – 4. ro. QI\ ; Crowthers. Michael H. (GE Infra. Energy. Non-GE) Schiffley. Frederick (GE Infra. Enerov. Non-GE)
Subject: FW: TEPCO Earthquake Information Update as of March 14, 0200(JST) – Fukushima Daini Unit 1 is now under
cold shutdown
Date: Sunday, March 13, 2011 3:45:34 PM
Just got this from TEPCO.
Thank you, Craig
From: C M ;) [mailto:[email protected]] On Behalf Of [email protected]
Sent: Sunday, March 13, 2011 3:48 PM
To: [email protected]
Subject: TEPCO Earthquake Information Update as of March 14, 0200(JST) – Fukushima Daini Unit 1 is
now under cold shutdown
Dear Friends,
Please find TEPCO’s Fukushima-Daini NPS update as of 2:00am , March 14.
At Unit 1, the reactor is now under cold shutdown. This has been completed and cooling of the
reactor has been commenced at 1:24 am, Mar 14th.
Contacts:
TEPCO Washington Office 202-457-0790
Kenji Matsuo, General Manager
Yuichi Nagano, Deputy General Manager,
Masayuki Yamamoto, Manager, Nuclear Power Programs
Press Release (Mar 14,2011)
Plant Status of Fukushima Daini Nuclear Power Station (as of’2:00 am March 14th)
Unit 1 (shut down at 2:48pm on March 11 th)
– Reactor is shut down and reactor water level is stable.
– Offsite power is available.
– At 8:19am, Mar 12th, there was an alarm indicating that one of the control rods was not
properly inserted, however, at 10:43am, Mar 12th the alarm was spontaneously called off. Other
control rods has been confirmed that they are fully inserted (reactor is in subcritical status)
– Status of main steam isolation valve: closed
– 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 at this moment.
– At 5:22am, Mar 12th, the temperature of the suppression chamber exceeded 100 degrees. As
the reactor pressure suppression function was lost, at 5:22am, Mar 12th, it was determined that
a specific incident stipulated in article 15, clause 1 has occurred.
– We decided to prepare implementing measures to reduce the pressure of the reactor
containment vessel (partial discharge of air containing radioactive materials) in order to fully
secure safety. This preparation work started at around 9:43am, Mar 12th and finished at 6:30pm,
Mar 12th.
– Restoration work in reactor cooling function that was conducted to achieve reactor cold
shutdown has been completed and cooling of the reactor has been commenced at 1:24 am, Mar
14th.
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 is done by Make-up Water Condensate System.
– We do not believe there is leakage of reactor coolant in the containment vessel.
– At 5:32am, Mar 12th, the temperature of the suppression chamber exceeded 100 degrees. As
the reactor pressure suppression function was lost, at 5:32am, Mar 12th, it was determined that
a specific incident stipulated in article 15, clause 1 has occurred.
– We decided to prepare implementing measures to reduce the pressure of the reactor
containment vessel (partial discharge of air containing radioactive materials) in order to fully
secure safety. This preparation work started at around 10:33am, Mar 12th and finished at
10:58pm, Mar 12th.
– Restoration work in reactor cooling function is in progress to achieve reactor cold shutdown.
Unit 3 (shut down at 2:48pm on March 1 1th)
– 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
– We do not believe there is leakage of reactor coolant in the containment vessel.
– We decided to prepare implementing measures to reduce the pressure of the reactor
containment vessel (partial discharge of air containing radioactive materials) in order to fully
secure safety. The preparation woke started at around 12:08pm, Mar 12th and finished at
12:13pm, Mar 12th.
– Reactor cold shutdown at 12:15pm, Mar 12th
Unit 4 (shut down at 2:48pm on March 1 1th)
– Reactor is shut down and reactor water level is stable.
– Offsite power is available.
– At 0:43PM, there was a signal indicating that one of the control rods may have not properly
inserted. However, we confirmed that it was inserted completely by another signal. We will
inspect the reason of this.
– Status of main steam isolation valve: closed
– 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.
– In order to cool down the reactor, injection of water into the reactor had been done by the
Reactor Core Isolation Cooling System, however, At 6:07am, Mar 12th, the temperature of the
suppression chamber exceeded 100 degrees. As the reactor pressure suppression function was
lost, at 6:07am, Mar 12th, it was determined that a specific incident stipulated in article 15,
clause 1 has occurred.
– We decided to prepare implementing measures to reduce the pressure of the reactor
containment vessel (partial discharge of air containing radioactive materials) in order to fully
secure safety. The preparation woke started at around 11:44am, Mar 12th and finished at
around 11:52am, Mar 12th.
– Restoration work in reactor cooling function is in progress to achieve reactor cold shutdown.
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.

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