05000333/LER-1979-048-03, /03L-0:on 790815,during Review of GE Svc Info Ltr 299,determined That Trip Points for low-low-low Water Level Instruments Should Be Readjusted to More Conservative Setpoint in Order to Preclude Possible Instrument Errors

/03L-0:on 790815,during Review of GE Svc Info Ltr 299,determined That Trip Points for low-low-low Water Level Instruments Should Be Readjusted to More Conservative Setpoint in Order to Preclude Possible Instrument Errors

ML19253A858
Person / Time
Site:	FitzPatrick
Issue date:	09/07/1979
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
ML19253A855	List: 05000333/LER-1979-048, Forwards LER 79-048/03L-0 05000333/LER-1979-048-03, /03L-0:on 790815,during Review of GE Svc Info Ltr 299,determined That Trip Points for low-low-low Water Level Instruments Should Be Readjusted to More Conservative Setpoint in Order to Preclude Possible Instrument Errors
References
LER-79-048-03L, LER-79-48-3L, NUDOCS 7909110551
Download: ML19253A858 (2)

LER-1979-048, /03L-0:on 790815,during Review of GE Svc Info Ltr 299,determined That Trip Points for low-low-low Water Level Instruments Should Be Readjusted to More Conservative Setpoint in Order to Preclude Possible Instrument Errors

Event date:
Report date:
3331979048R03 - NRC Website

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POWER AUTIIORITY OF Tile STATE OF NEW YORK JAMES A. FIT:'. PATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333 ATTACIIMENT TO LER 79-048/03L-0 Page 1

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While in a cold shutdown condition, during a review of General Electric Company's Service Information Letter (SIL) No. 299 which is titled "High Dry-well Temperature Effect on Reactor Water Level Instrumentation," it was deter-mined that the trip points for the low-low-low water level instcuments should be readjusted' to a more conservative set point in order to preclude pos ible instrument errors as a result of certain hypothetical conditions.

The instruments set points were recalculated to account for a postulated change in water density in the reference column of Yarway compensated water level instruments during drywell ambient temperature rise associated witL certain postulated events.

Each assumption used in the development of the final reference column temperature contains conservatism which results in new calculated set points which centain significant margin to the safety limit.

These calculations were reviewed and verified for accuracy by General Electric. The discovery of the possible errors is considered to be a reportable event as defined by Technical Specifications Appendix A, Paragraph 6.9. A.

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