ML20055F936

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Advises That No 30-day Rept Will Be Made Re Degradation of Seismic Support Bolts of post-accident Hydrogen Recombiners 1-HC-HC-1 & 2-HC-HC-1
ML20055F936
Person / Time
Site: North Anna  Dominion icon.png
Issue date: 07/16/1990
From: Stewart W
VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.)
To:
NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
90-415, NUDOCS 9007190388
Download: ML20055F936 (2)


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- INGINIA 13LECTHIC AND POWEH COMPANY RICHMOND,YluotNIA 20001 July 16,1990

- U.S. Nuclear Regulatory Commission Serial No.

90 415 L Attention: Document Control Desk NAPS /RCS/rcs Washington, DC L 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

~ CHANGE - IN REPORTABILITY On June 16,_1990 El 1856 hours0.0215 days <br />0.516 hours <br />0.00307 weeks <br />7.06208e-4 months <br />, a four-hour report was made for degradation of-

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seismic support bolts on Post accident Hydrogen Recombiners 1-HC-HC-1 and 2-HC-

.HC 1. pursuant to' the requirements. of 10CFR50.72(b)(2)(lii)(D).

Subsequent engineering evaluation of the scismic support bolts of 2 HC-HC-1 has determined that.

the degradation was insuffic!ent to affect the ability of the bolts to support the design basis seismic load,' Therefore, 2-HC-HC-1 was operable and fully capable of performing its design function.

Because'one of the_ two hydrogen recombiners was operable throughout this event and the design ba_ sis takes credit for only one hydrogen recombiner, this event was no1 reportable pursuant to 10CFR50.72 nor is it reportable pursuant to 10CFR50.73.

' The bolts on both hydrogen recombiners were inspected and the degraded bolts were replaced.

Due to the change in reportability, no thirty-day report is required or will be made. This change in reportability was discussed with Mr. Steve Bloom of the NRC-Operations Center at 0939 hours0.0109 days <br />0.261 hours <br />0.00155 weeks <br />3.572895e-4 months <br /> on~ June 29,1990.

Very truly yours, W. L. Stewart

' Senior Vice President - Nuclear

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U.S. Nuclear Regulatory Commission Region ll 101 Marietta Street, N.W.

Suite 2900L Atlanta, Georgia.30323 Mr. M. S. Lesser NRC Senior Resident inspector North Anna Power Station I