05000333/LER-1979-006-03, /03L-0 on 790124:ground Fault on 125 Volts DC Station Battery a Noted.Caused by Bellows Failure (Pressure Switch Circuit) on Safety Relief Valve

/03L-0 on 790124:ground Fault on 125 Volts DC Station Battery a Noted.Caused by Bellows Failure (Pressure Switch Circuit) on Safety Relief Valve

ML19289D161
Person / Time
Site:	FitzPatrick
Issue date:	02/16/1979
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
ML19289D158	List:
References
LER-79-006-03L, LER-79-6-3L, NUDOCS 7902230088
Download: ML19289D161 (4)

LER-1979-006, /03L-0 on 790124:ground Fault on 125 Volts DC Station Battery a Noted.Caused by Bellows Failure (Pressure Switch Circuit) on Safety Relief Valve

Event date:
Report date:
3331979006R03 - NRC Website

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ATTACllMENT TO 1.ER 79-006/03L-0 Page 1

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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 cicared by removing the fuses for the air operator and bellows failure pressure switch. This action required that the valve be demlared inoperabic which is contrary to Technical Specification Appendix A, Paragraph 3.6.E.1.

During the thirty days in which operation is permitted by specification 3.6.E.2.a, the valve was restored to a fully operable status on February 8,1979 (fifteen days after the event). This action was accomplished 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.

During the Snubber Inspection Outage currently scheduled to start on March 30, 1979 repairs and restoration of the circuit will be completed and a fol'ow-up report submitted.

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