ML20043D166

Requests Withdrawal of 860321 Request for NRC Review & Approval of Engineering Evaluations 7 & 8 Re App R Fire Protection Features at Plant,Based on Establishing 60-minute Interval Prior to Requiring Reentry Into Fire Area

ML20043D166
Person / Time
Site:	North Anna
Issue date:	05/30/1990
From:	Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
90-293, GL-86-10, NUDOCS 9006070203
Download: ML20043D166 (2)

Text

o VIRGINIA EttcTRic AND POWER COMPANY RicuMOND, VIRGINIA 23261 May 30,1990 United States Nuclear Regulatory Commission Serial No.

90 293 Ationtion: Document Control Desk NL&P/JDH:vlh Washington, D. C. 20555 Docket Nos.

50 338 50 339 License Nos. NPF 4 NPF 7 Gentlemen:

VIRGINIA ELECTRIC AND POWER COMPANY NORTH ANNA POWER STATION UNITS _1 AND 2 APPENDIX R ENGINEERING EVALUATIONS On March 21,1986 (Serial No. 86 065), we submitted four engineering evaluations related to certain Appendix R fire protection features at North Anna for which we requested NRC review and approvai. During the triennial Appendix R inspection conducted by NRC Region ll on July 18 22,1988, NRC inspectors identified a concern with two of those evaluations. Those evaluations were titled: "7.

Evaluation of Operator Access to the Charging Pump Cubicles" and "8.

Evaluation of Operator Access to the Motor Driven Auxiliary Feedwater Pump Room." Both evaluations determined that reentry into the affected fire area within thirty minutes to take certain manual actions was feasible.

The inspector's concern was discussed in NRC inspection report no. 50 338,339/88-13, dated September ',3,1988 in which the inspector questioned the validity of the reentry time assumption supporting those two evaluations. Traditionally, NRC has not approved entry into a fire area to take manual operations to mitigate the consequences of a fire in less than sixty minutes of a fire event. The issue was designated Unresolved item 88 13 02 and Region 11 requested technical assistance from NRR to determine the acceptability of the evaluations.

We have subsequently reevaluated the reentry time assumption contained in those evaluations. Through analysis we have been able to extend the period described in the evaluations from thirty to sixty minutes prior to requiring reentry into the affected fire areas. On April 4,1990, we met with Messrs. L. Engle and D. Notley of NRR to describe our revised analysis.

6070203 90033o F

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i Based on establishing a sixty minute interval prior to requiring reentry into the fire area and our subsequent d:scussions with NRR staff, we are withdrawing our request for NRC review and approval of engineering evaluation nos. 7 and 8. Rather, the revised evaluations will be maintained onsite for NRC audit during future inspections as permitted by Generic Letter 8610," Implementation of Fire Protection Requirements,"

paragraph C, dated April 24,1986.

Very truly yours,

.)

$J W. L. Stewart Senior Vice President Nuclear cc:

United States Nuclear Regulatory Commission Region ll r

101 Marietta Street, N. W.

Suite 2900 Atlanta, Georgia 30323 Mr. M. S. Lesser NRC Senior Resident inspector North Anro Power Station 1

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