April 28th, 2011 – Clarification of methods used for Reactor 1 Lower Head Analysis

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From: Salay, Michael
Sent: Thursday, April 28, 2011 3:02 PM
To: Gauntt, Randall 0
Cc: Lee, Richard; Esmaili, Hossein; Marksberry, Don
Subject: integrity of U1 lower head

Randy,

We need some clarification on your Mathcad analysis of the U1 lower head integrity:

What we think we were hearing on the consortium call for the past few days was that, based on the analysis, vessel integrity would be maintained even if water injection was lost. This seemed to imply that containment flooding was not needed to maintain vessel integrity.

What we interpret from your analysis is that vessel integrity would be maintained even if water injection was lost if containment was flooded and skirt wall is cooled. This indicates that, based on the analysis, containment flooding would still be required to maintain vessel integrity.

We realize that this assumes that a high vessel-to-containment pressure differential does not develop.

Would you please let us know which was intended?

Thank you,
-Mike



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