ML19323A096

RO 80-023/01T:during Operational Mode 5,w/steam Generators & RCS Level at mid-span in Loops,Complete Loss of RHR Flow Occurred While Plant Operators Were Increasing Heat Exchanger Flow.Procedure Rewritten

ML19323A096
Person / Time
Site:	Beaver Valley
Issue date:	04/11/1980
From:	Werling J DUQUESNE LIGHT CO.
To:
References
BVPS:JAW:837, NUDOCS 8004170223
Download: ML19323A096 (2)

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.35 S.ath Avenue t urgh, Pennsylvania DUQUESNE LIGHT COMPANY Beaver Valley Power Station Post Office Box 4 Shippingport, PA 15077 April 11, 1980 BVPS: JAW:837 Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 LER 80-023/OlT I

Mr. B. H. Grier, Director of Regulation United States Nuclear Regulatory Commission Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

In accordance with Appendix A, Beaver Valley Technical Specifications, the following occurrence is reported. This matter was discussed with Beaver Valley i NRC Resident Inspector, Mr. D. A. Beckman, today at 0230 hours0.00266 days <br />0.0639 hours <br />3.80291e-4 weeks <br />8.7515e-5 months <br />.

The plant was in Operational Mode 5 with the steam generators drained and Reactor Coolant System (RCS) level at mid-span in the loops. RCS temperature i was 101F and the "B" Residual Hect Removal (RHR) Pump was in service.

A complete loss of RHR flow occurred while plant operators were in the  :

process of increasing RHR heat eachanger flow by closing down on the bypass  !

valve. At 0200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br />, when beginning this evolution, pump flow dropped to zero as the pump became airbound. At this point, the 11. RHR Pump was shut down and the 1A RHR Pump started. [RH-P-1A] started with no indicated flow and low pump amps, so it was shut down also.

Both pumps were then vented and they were restarted with no effect. RCS  !

loop level was then inpreased to approximately 92r leval in the loops. At j 0108 hours0.00125 days <br />0.03 hours <br />1.785714e-4 weeks <br />4.1094e-5 months <br />, the 1B RHR Pump was started and operated satisfactorily with tha  ;

operator continuously venting. At 0130 hours0.0015 days <br />0.0361 hours <br />2.149471e-4 weeks <br />4.9465e-5 months <br />, a nominal 1900 gpm RHR flow was restored with the pumps vented. ,

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$ 8004;170 22.3

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Mr. B. H. Grier April 11, 1980 BVPS: JAW:837 Page 2 The station is moving ahead with an engineering investigation for a '

continuous vent setup to be used when the loops are partially drained. Station personnel are investigating the as-built piping layout for any deficiencies and associated valves for problems. An abnormal procedure had been written for a total loss of RHR and is in the process of being impicmented.

Any additional information and corrective action will be discussed in a followup report.

Very truly yours, J.A.Werlingb Superintendent cc: Director Of Management & Program Analysis ,/'

United States Nuclear Regulatory Commission Washington, D. C. 20555 D. L. Wigginton, BVPS Licensing Project Manager United States Nuclear Regulatory Commission Washington, D. C. 20555 '

D. A. Beckman, Nuclear Regulatory Commission, BVTS Site Inspector C. A. Olson, Secretary, Prime Movers Committee - EEI C. J. Six, PA Public Utilities Commission, Harrisburg, PA W

.