March 11th, 2011 – NRC 23:15 Telecon Fukushima – Reactor 2 containment pressure almost double of design basis

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Franovich, Mike
From: Franovich, Mike
Sent: Saturday, March 12, 2011 2:51 AM
To: Zorn, Jason; Kock, Andrea
Subject: FW: RESEND: 23:15 Telecon Fukushima

Thought you might be interested. Five reactors are having trouble with core cooling. Rad levels in at one unit at Fukushima Daiichi show rad level 1000 times above background (most likely measured at the vent stack but that is unconfimed).

Franovich, Mike
From: Franovich, Mike
Sent: Saturday, March 12, 2011 12:05 AM
To: Ostendorff, William; Nieh, Ho; Warnick, Greg
Subject: 23:15 Telecon Fukushima

Sir,

o NRC still in MONITORING mode; Staff relying on media, TEPCO and NISA press releases. Information is spotty. 35 NRC folks on the call. Scott Morris led the call with Weber.

o Update on Fukushima Daiichi is no new news on status of units. It appears a 35 ft water of wall hit the site and knocked the emergency diesel generators fuel oil tanks out. These tanks are on supports above ground. This explains why the EDGs stopped working after about an 30 minutes to an hour after the first quake.

o NRC has been in contact with General Electric and Exelon. GE has asked Exelon to run some scenarios on the Dresden and Quad Cities simulator to estimate time to certain effects on the Daiichi units 1 and 2. Unit 1 has an isolation condenser (passive heat sink, DC operated valves to open). Unit 2 has a RCIC pump (low flow, steam driven pump). The NRC’s reactor safety team is looking at the event as a station blackout (no different than what we said this morning).

o Containment pressure on Unit 2 may have been as high as 85 psig (almost double of design pressure. Venting to prevent gros failure would be appropriate. I should note that the accuracy of the 85 psig report is suspect.

 

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o Japanese government has asked for some engineering tech assistance. NRC working with USAID who is coordinating sending US Fed personnel on USAF transport. NRC will have a tech person on the flight or commercial flight in the morning.

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o Japanese have NOT asked for aerial rad sample support.

” I brought to their attention that TEPCO is reporting that Fukushima Daini Nuclear Power Station has vented containments on Daini Unit 1 thru 4 to reduce the pressure of the reactor containment vessel (partial discharge of air containing radioactive materials) in order to fully secure safety.

o As an aside it looks like residents within 3km of the Daini site have been evacuated. For Daichi it was report that the evacuation was extended to 10 km.

Note that there is a video of the wave hitting Daiichi and an aerial of the Damage to the site (type Fukushima nuclear plant in google and you will get the hits).

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