ML19253B582

LER 79-075/03L-0:on 790915,during Normal Operations,Drywell Equipment Drain Sump Flow Integrator Observed Not Operating While Sump Was Pumped Down Due to Blown Fuse in Integrator Current Power Supply.Fuse Replaced & Sys Tested

ML19253B582
Person / Time
Site:	FitzPatrick
Issue date:	10/12/1979
From:	W. Verne Childs POWER AUTHORITY OF THE STATE OF NEW YORK (NEW YORK
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19253B576	List: ML19253B574 ML19253B582
References
LER-79-075-03L, LER-79-75-3L, NUDOCS 7910160438
Download: ML19253B582 (2)

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. POWER AUTHORITY OF THE STATE OF NEW YORK JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333 ATTACHMENT TO LER 79-075/03L-0 Page 1 of 1 During normal operation, Operations personnel noted that the Drywell Equipment Drain Sump Flow Integrator was not operating while the sump was being pumped down.

This resulted in operation of the reactor coolant leakage detection subsystem in a degraded mode allowed by Technical Specifications Appendix A, Paragraph 3.6.D.2.

The FitzPatrick plant contains as permanent equipment dif ferentiating instruments which display and record the rate of rise of the drywell equipment drain sump icvel.

Examination of the recording charts associated with this instrument, together with the sump level indicator recorders which provide indication of the frequency of sump pump operation, revealed that the rate of identified equipment leak off was approximately 4 gpm as compared to a Technical Specification limit of 25 gpm. The re fo re , the event did not represent a significant hazard to the public health and safety.

Investigation of the problem revealed a blown fuse in the integrator current power supply. The fuse was replaced and a pump down of the sump was manually initiated to verify proper operation of the system on the same day as discovery of the event.

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