05000333/LER-1979-052-04, /04L-0:on 790830,computer Calculations for Condenser Inlet Water & Plant Cooling Water Discharge Temp Differential Temp Were Found Out of Calibr.Cause Not Stated. Instruments Recalibr within Tech Specs Limits

/04L-0:on 790830,computer Calculations for Condenser Inlet Water & Plant Cooling Water Discharge Temp Differential Temp Were Found Out of Calibr.Cause Not Stated. Instruments Recalibr within Tech Specs Limits

ML19208D475
Person / Time
Site:	FitzPatrick
Issue date:	09/25/1979
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
ML19208D470	List: 05000333/LER-1979-052, Forwards LER 79-052/04L-0 05000333/LER-1979-052-04, /04L-0:on 790830,computer Calculations for Condenser Inlet Water & Plant Cooling Water Discharge Temp Differential Temp Were Found Out of Calibr.Cause Not Stated. Instruments Recalibr within Tech Specs Limits
References
LER-79-052-04L, LER-79-52-4L, NUDOCS 7909280467
Download: ML19208D475 (2)

LER-1979-052, /04L-0:on 790830,computer Calculations for Condenser Inlet Water & Plant Cooling Water Discharge Temp Differential Temp Were Found Out of Calibr.Cause Not Stated. Instruments Recalibr within Tech Specs Limits

Event date:
Report date:
3331979052R04 - NRC Website

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FITZPATRICK NUCLEAR POWER PLANT DOCKET NO. 50-333 AT1sCIIMENT TO LER 79-052/04L-0 Page 1

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While shutdown in the cold condition, during the conduct of F-IMP-36.5 titled

" Circulating Water System Water Temperature RTD's," the computer calculations for condenser inlet water and plant cooling water discharge temperature differential temperature were found out of calibration.

Technical Specifications Appendix B, Paragraph 2.1.1 requires calculation of the differential temperature with an accuracy of 0.5 F.

While performing F-IMP-36.5 these calculations were found to be in error at several points between 32 and 104.4 F.

In each case the indicated differential temperature was larger than the actual differ-ential temperature, the largest errcr being 1.83 F.

In view of the small error and the instrument drift in the conservative direction, the event did not represent any significant hazard to the public ' health and safety.

The instruments were recalibrated to within the limits of Technical Specifica-tions and verified satisfactory utilizing F-IMP-36.5.

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