ML20091A936
| ML20091A936 | |
| Person / Time | |
|---|---|
| Site: | North Anna  |
| Issue date: | 03/24/1992 |
| From: | Stewart W VIRGINIA POWER (VIRGINIA ELECTRIC & POWER CO.) |
| To: | NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM) |
| References | |
| 92-192, NUDOCS 9203300287 | |
| Download: ML20091A936 (2) | |
Text
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o Vlien NI A 1:.i:rlitic AND l'OW :H COMi%NY Itionewouis,Vinoisir unuses March 24, 1992 U.S. Nuclear Ro0ulatory Commission Sorial No.
92 192 Attention: Document Control Desk NL&P/MPW:
R1 Washington, D.C. 20555 Docket Nos.
50 338 License Nos. NPF 4 Gentlemen:
VJfLqlNIA ELECTRIC AND POWER COMPANY llORTH ANM& POWER STATION UNITS 1 AND_2 FIRE S.QPPRESSION WATER SYSTEM INOPERABLE On March 10 1992, a failure of the underground fire protection header piping was experienced. The failure occurred in the pipin0 where the diesel driven fire pump discharge lino connects to the main fire protection header. Attempts were made to isolate the header while maintaining the motor driven fire protection pump operable.
The differential pressure across the associated valves precluded Isolation of the failed section of pipe. Subsequently, the firo protection pumps were manually secured and the header pressure reduced to allow isolation of the fire header. This evolution rendered the fire suppression water system inoperable. The event is being reported as a Special Report in accordance with Section 16.2 1.2.1 of the North Anna Power Station Updated Final Safoty Analysis Report.
The loak. was isolated and the motor driven fire protection pump was returned to service on March 10, 1992. The duration of unavailability was 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> 53 minutes.
Repairs to the main firo protection header wete completed on March 15,1992. The diesel driven fire protection pump was returned to servico on March 17,1992 at 0327 hours0.00378 days <br />0.0908 hours <br />5.406746e-4 weeks <br />1.244235e-4 months <br /> and the action was cleared.
The North Anna Power Station Senior Resident inspector and Region ll management were nutified of the event at 1700 and 1705 hours0.0197 days <br />0.474 hours <br />0.00282 weeks <br />6.487525e-4 months <br />, respectively, on March 10,1992.
This Special Report has been reviewed by the Station Nuclear Safety Operating Committee and will be presented :c the Management Safety Review Committee.
i Should you have any questions or require additionalinformation, please contact us at your earliest convenience.
I Very truly yours, CL w u '.
p W. L. Stewart Senior Vice President - Nuclear gk 6 4
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U.S. Nuclear Regul ry Commission Region ll 101 Mariotta Street, N.W.
Suite 2000 Atlanta, Georgia 30323 Mr. M. S.1 osser NRC Senior Resident inspector i
North Anna Power Station W
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