ML052420402
| ML052420402 | |
| Person / Time | |
|---|---|
| Site: | Vermont Yankee File:NorthStar Vermont Yankee icon.png |
| Issue date: | 08/29/2005 |
| From: | Richard Ennis Office of Nuclear Reactor Regulation |
| To: | Daflucas R Office of Nuclear Reactor Regulation |
| References | |
| Download: ML052420402 (2) | |
Text
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UNITED STATES by t4>NUCLEAR REGULATORY COMMISSION WASHINGTON, D.C. 20555-0001 FACSIMILE COVER PAGE DATE: 8/29/05 TO:
Ronda Daflucas FAX NO:
802-258-2102 TEL NO:
FROM:
Rick Ennis U.S. NUCLEAR REGULATORY COMMISSION OFFICE OF NUCLEAR REACTOR REGULATION FAX NO.:
(301) 415-2102 TEL NO: (301) 415-1420 PAGE 1 of 2 PAGES REMARKS:
Ronda - Attached is a revised version of VY EPU RAI SPLB-A-31. This supercedes the wording in the version I sent out in the 3rd draft set of RAls on 8/25. I can send you the whole set electronically once your email is working.
- thanks, Rick C:\\MyFiles\\Miscellaneous\\FAX Form VY.wpd
- 31.
Compressed Air/Gas System In Section 2.5 of Attachment 2 to Entergy's letter dated March 24, 2005, the licensee provided the following information regarding safety relief valves (SRVs):
"The SRVs which are used to depressurize the reactor are provided with nitrogen accumulators. Additionally, a backup N2 [nitrogen] supply system was installed to support manual operation of the SRVs for 72 hours8.333333e-4 days <br />0.02 hours <br />1.190476e-4 weeks <br />2.7396e-5 months <br /> (Reference 5). The backup system automatically (via a check valve) provides makeup to the SRV nitrogen accumulators."
During an SBO event, how are the SRVs expected to operate? How does that expected SRV operation align with the assumptions used to size the nitrogen accumulators and the 72-hour backup nitrogen supply?