ML19257B361

LER 79-110/03L-0:on 791214,HPCI Sys Steam Supply Inboard Isolation Valve 23-MOV-15 Closed Due to Spurious Isolation Signal.No Cause Found.Isolation Signal Reset & Valve Reopened to Restore HPCI Sys to Operation

ML19257B361
Person / Time
Site:	FitzPatrick
Issue date:	01/08/1980
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
ML19257B342	List: ML19257B341 ML19257B361
References
LER-79-110-03L, LER-79-110-3L, NUDOCS 8001150612
Download: ML19257B361 (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 LEF 79-110/03L-0 Page 1 of 1 During normal operations the HPCI System Steam Supply intoard Isolation Valve (23-M0V-15) closed as a result of a spurious isolation signal . This signal and t,he closing of 23-MOV-15 rendered the HPCI system inoperable at a time period when it was required to be operable by Technical Specifications Appendix A, Paragraph 3.5.C. Since no confi rming indication, wi th respect to the isolation, was available, the isolation signal was immediately reset and 23-MOV-15 was reopened to restore the HPCI system to an operable status. There-fo re , the event did not represent any significant hazard to tha public health and safety.

Extensive troubleshooting of the portion of the primary containment isolation system associated with 23-MOV-15 was conducted and no cause for the spurious signal could be found nor could the condition be duplicated. In addition, instru-ment surveillance of those instrument subsystems which could cause isolation of 23-MOV-15 was conducted and no cause for the isolation could be found.

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