ML19254F485

LER 79-084/03L-0:on 791009,during Surveillance Test F-ST-5Q, Average Power Range Monitor Channels a & D Tripped at Value Above Tech Spec Max.Caused by Error in Calibr Procedure. Calibr Procedure Revised & Instruments Returned to Svc

ML19254F485
Person / Time
Site:	FitzPatrick
Issue date:	11/06/1979
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
ML19254F481	List: ML19254F480 ML19254F485
References
LER-79-084-03L, LER-79-84-3L, NUDOCS 7911090515
Download: ML19254F485 (2)

Text

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POWER AUTHORITY OF THE STATE OF NEW YORK JAMES A. FITZPATRICK NUCLEAR POWER PLANT P^JKET NO. 50-333 ATTACHMENT TO LER 79-034/03L-0 Page 1 of 1 During normal operation while conducting Operations Surveillance Test F-ST-SQ titled " Flow Bias Functional Test" to satisfy the rec;uirements of Technical Specifications Appendix A, Table 3.1- 1, Average Power Range Monitor (APRM)

Channels "A" and "D" tripped at a value of 120.5, as read by the Operator en the me te r fa ce. This was .5% over the Technical Specification requirement of equal to or less than 120% of rated power. Since APRM channels B, C, E and F were found within the limits of Technical Specifications and the minimum operability requirements of 2 channels for each RPS channel was met, the event did not represent a signi ficant hazard to the public health and safety.

Investigation and review of the procedures used for surveillance and calibra-tion revealed that the calibration procedure called for setting the instrument trip at 120% of rated power. Calibration in this manner would result in a trip at greater than the Technical Specification limit for any dri f t in the non-conservative direction even when the drift was within the accuracy limits of the instrument. Based on these findings, the APRM calibration procedure was revised to require calibration at 118.5% ( l.5%). Recalibration was completed and the instruments returned to service approximately 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> af ter the out of specifica-tion trip points were noted.

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