ML19253B052

LER 79-006/03X-1:on 790124,during Normal Operations,Ground Fault on 125 Station Battery a Noted.Caused by Bellows Failure on Pressure Switch Circuit safety-relief Valve 02-RV-71J.Ground Cleared.Valve Restored to Operation

ML19253B052
Person / Time
Site:	FitzPatrick
Issue date:	09/11/1979
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
ML19253B051	List: ML19253B050 ML19253B052
References
LER-79-006-03X, LER-79-6-3X, NUDOCS 7909140423
Download: ML19253B052 (4)

Text

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, JAMES A. FITZPATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333 ATTAOIMENT TO LER 79-006/03X-1 Page 1 of 3 During normal operation, Operations personnel noted a ground fault on 125 VDC station battery "A". Investigation traced the ground to the bellows failure pressure switch circuit on safety / relief valve 02-RV-71J.

The ground was cleared by removing the fuses for the air operator and bellows failure pressure switch. This action required that the valve be declared inoperabic which is permitted by specificatior. 3.6.E.2.a. The valve was restored to a fully operabic sta' a on February 8, 1979 (fifteen days after the event) by installing a temporary isolated 125 VDC power supply to the bellows failure pressure switch (See Figures 1 and 2) and replacing the fuses that were initially removed to clear the ground. The circuits were checked for operability (to the extent possible from outside of primary containment) with satisfactory results and valve 02-RV-71J was declared fully operable. Since the remaining 10 valves were fully operable the event did not represent any significant hazard to the public health and safety.

Following the plant shutdown for seismic reanalysis the pressure switch was replaced with a new switch and the 125 VDC power system was restored to its design configuration as shown on Figure 1. The new pressure switch was calibrated and verified operable by satisfactory completion of Instrument Surveillance Procedure F-ISP-42 titled " ADS Relief Valve Bellows Pressure Switch."

NOTE: Revision 1 of this LER is submitted to inform the Commission of the completion of the work and the restoration of the associated 125 VDC circuits to normal. In addition, Items 11 through 19, 25 and 26 of the report are revised.

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