ML043020521

E-mail R. Ennis, NRR, to R. Lobel, NRR, Revised Paragraph

ML043020521
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	03/24/2004
From:	Richard Ennis Office of Nuclear Reactor Regulation
To:	Lobel R Office of Nuclear Reactor Regulation
References
FOIA/PA-2004-0362
Download: ML043020521 (1)

Text

WIc-k- E-n-nIis* Re., R'_e-vised- pDa r-agrapDh Page 1 ;1 Rick Ennis Re: Revised DaraaraDh Pace 1 I From: Rick Ennis \

To: Richard Lobel /

Date: 3/24/04 1:38PM

Subject:

Re: Revised paragraph thanks

>>> Richard Lobel 03/24/04 01 :38PM >>>

Looks good.

>>> Rick Ennis 03/24/04 01 :35PM >>>

Rich, Here's the revised paragraph. Let me know i it's okay:

The NRC staff has also considered the impact of credit for containment accident pressure for so-called beyond-DBAs during which the ECCS or the containment heat removal system may be called upon to function. For station blackout, anticipated transients without scram and Appendix R postulated fires, the suppression pool conditions are typically less severe than those for the design-basis LOCA. For these postulated events, no debris would be generated and, therefore, the flow losses are considerably lower for these events than for the design-basis LOCA and the available NPSH consequently greater. Credit for containment accident pressure is sometimes needed for these events, although the design-basis LOCA conditions would be bounding. Credit for containment accident pressure is not needed for shutdown conditions.

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