ML19291C267

LER 80-02/01T:on 800117,while in Operational Mode 5,received Indication of Low Residual Heat Removal Sys Flow When Low Flow Alarm Was Annunciated & Low Pump Amps Noted.Caused by Steam Generator Burp.Air Eductor Installed

ML19291C267
Person / Time
Site:	Beaver Valley
Issue date:	01/17/1980
From:	Werling J DUQUESNE LIGHT CO.
To:
References
BVPS:JAW:769, NUDOCS 8001230251
Download: ML19291C267 (2)

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$8 "*"'* DUQUESNE LIGHT COMPANY Beaver Valley Power Station Post Office Box 4 Shippingport, PA 15077 January 17, 1980 BVPS: JAW:769 Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 LER 80-2/0lT Mr. B.-H. Grier, Director of Regulation United States Nuclear Regulatory Coc: mission Region 1 631 Park Avenue King of Prussia, Pennsylvania 19406

Dear Mr. Grier:

In accordance with Technical Specification 3.4.1.1, Reactor Coolant Loops, the following occurrence is reported. This occurrence was discussed with the Beaver Valley NRC Resident Inspector, Mr. D. A. Beckman, at 0600 hours0.00694 days <br />0.167 hours <br />9.920635e-4 weeks <br />2.283e-4 months <br /> on January 17, 1980.

The plant was in Operational Mode 5 with the steam generators drained and the Reactor Coolant System level at mid-span in the loops. The Reactor Coolant System temperature was 100F and the "B" Residual Heat Removal Pump was in service.

At 0015 hours1.736111e-4 days <br />0.00417 hours <br />2.480159e-5 weeks <br />5.7075e-6 months <br />, indication of low Residual Heat Removal System flow was received when the " low flow" alarm was annunciated and low pump amps was noted visually. At this time, Residual Heat Removal Pump [RH-P-1B] was shut down and

[RH-P-1A] was started. [RH-P-1A] also indicated no flow and low pump amps.

At 0026 hours3.009259e-4 days <br />0.00722 hours <br />4.298942e-5 weeks <br />9.893e-6 months <br />, Operations started increasing Reactor Coolant System loop level from 50% to 70%. The pumps and shaft seals were vented and flow restored at 0054 hours6.25e-4 days <br />0.015 hours <br />8.928571e-5 weeks <br />2.0547e-5 months <br />.

When Reactor Coolant System flow was reestablished, Tavg indicated 126F.

kool 1792 344 5

/D 8001230 251

Mr. B. H. Grier January 17, 1980 BVPS: JAW:769 Page 2 The cause of the air binding problem originated when a steam generator

" burped" while educting air through the Reactor Coolant System. The air eductor is installed to sweep the Reactor Coolant System of noncondensable gases prior to refueling.

Any additional information or corrective action will be addressed in the follow-up report.

Very truly yours,

/. od g4v J. A. Werling Superintendent cc: Director Of Management & Program Analysis 9/ '

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, King of Prussia, PA G. A. Olson, Secretary, Prime Movers Committee - EEI i792 345