ML043030228

E-mail R. Ennis, NRR, to R. Lobel, NRR, Containment Overpressure Briefing

ML043030228
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	06/17/2004
From:	Richard Ennis Office of Nuclear Reactor Regulation
To:	Lobel R Office of Nuclear Reactor Regulation
References
FOIA/PA-2004-0362
Download: ML043030228 (1)

Text

I Michael Tschiltz - Fwd: Re: Containment overpressure briefing - Page1; From: Rick Ennis J -4 To: Richard Lobel Date: 6/17/04 2:19PM

Subject:

Fwd: Re: Containment overpressure briefing Rich, I'm not so sure about making the statement 'there is an acceptably small increase in risk." I thought we were going to assess the risk aspect generically after we review how VY addresses the RAls.

Right now our letter to Sherman states that:

The NRC staff will allow credit for containment accident pressure to be taken only when the licensee's analyses and justification for the proposed licensing basis change demonstrate that there is reasonable assurance that the credited pressure will exist for the events and time period for which the credit is required. Ensuring containment integrity and avoiding overcooling of the containment due to excessive use of containment sprays are key considerations in determining whether the credited pressure will be available during the required time period.

Thanks, Rick'

>>> Richard Lobel 06/17/04 01 :52PM >>>

FYI I propose to make another vugraph to discuss the purpose of the meeting and the question(s) to be answered.

Purpose:

To inform EDO of status of the issue To get agreement with the position that we will grant overpressure credit for NPSH when (1) a sufficiently conservative calculation shows that it is available, and (2) there is an acceptably small increase in risk. There is no consideration of the reason for requesting overpressure credit.

CC: Allen Howe; Martin Stutzke; Michael Tschiltz; Robert Dennig