ML043020516
| ML043020516 | |
| 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: ML043020516 (1) | |
Text
Rik Ennis -Yellow Ticket-Responseq1 toVermont
_- _~
From:
Rick Ennis
\\
To:
Richard Lobel/
i(I Date:
3/24/04 12:14PM
Subject:
Yellow Ticket - Response to Vermont
- Rich,
-In reviewing the SPSB comments to the Yellow Ticket response to Vermont, page 6 of the letter has the following paragraph:
The N RC 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 less severe than those for the design-basis LOCA. Credit for containment accident pressure Is not needed for shutdown conditions. 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. As a result, credit for containment accident pressure is not needed.
Several questions:
- 1) Is "shutdown conditions" one of the "events' we are talking about In 2nd to last sentence? If not, shouldn't the sentence "Credit for containment accident pressure is not needed for shutdown conditions."
be moved to the end of the paragraph and be revised to state: "Credit for containment accident pressure is also not needed for shutdown cniin.
- 2) Vermont Yankee's submittal dated 9/10/03 on page 2 of the cover letter states they are requesting the containment overpressure credit f or LOCA, station blackout, and Appendix R f ire events which is contrary to the above paragraph (see bottom of page 2 of 38 of first file attached). However, review of Attachement 4 of the submittal, Section 4.2.6, makes it appear that they are only requesting the credit for LOCA (see page 101 -1 03 of 214 of second file attached). Let's discuss.
- Thanks, Rick