March 23rd, 2011 – Suspect 3 ft of salt in bottom of reactor vessel – SFP lasted 3 days

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From: Wolfgang, Robert
Sent: Wednesday, March 23, 2011 3:53 PM
To: Salley, MarkHenry; Quails, Phil; McCann, Edward
Subject: RE:

I was in a meeting yesterday and we were told that it is suspected that there is 3 feet of salt in the bottom of the reactor vessel (I forget which Unit) from the seawater cooling.

Bob Wolfgang
Senior Mechanical Engineer
U. S. Nuclear Regulatory Commission

From: Salley, MarkHenry
Sent: Wednesday, March 23, 2011 3:49 PM
To: Qualls, Phil; McCann, Edward; Wolfgang, Robert
Subject: RE:


It’s steam all right & U3 SFP boil off is the best guess. The pools should have lasted min. 8 days (by the most conservative calcs I saw – 10 days is a better estimate) after the event before they got to the magic 50% covering of the fuel assemblies which gives you the Zirc oxidation & H2 liberation. I understand the guess is the pool lasted 72 hours – you can infer what happened.

The core is melted & the primary is full of sea water, so it could be coming off the hot primary containment?

But everyone is betting on SFP ………


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