ML20009B538

LER 81-018/03L-0:on 810516,testing Indicated That Low Pressure Safety Injection & Reactor Trip Were Below Tech Spec Limits for Pressure Transmitters.Caused by Instrument Drift.Sensing Lines Flushed.Amplifier Replaced

ML20009B538
Person / Time
Site:	Kewaunee
Issue date:	06/15/1981
From:	Molzahn D WISCONSIN PUBLIC SERVICE CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009B532	List: ML20009B531 ML20009B533 ML20009B535 ML20009B538
References
LER-81-018-03L, LER-81-18-3L, NUDOCS 8107160249
Download: ML20009B538 (2)

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REPORT DATE EVENT DESCRIPTION AND PROBACLE CONSEQUENCES h O 2 lDuring refueling outage, surveillance testing indicated that one of three pressurizer i i o 13 l l pressure transmitters was out of calibration such that its lo-pressure safety in- l o 4 ljection and its lo-pressure reactor trip would have occurred 12.62% lower and 12.67% l lo Is] l lower than the Tech. Spec. specified values respectively. This placed the facility l l o 161 lunder reporting requirement of T.S. 3.5a. The remaining two channels were operable l l0171 Iwithin specified limits and would have initiated safety injection or a reactor trin l I O la l las required. There was no effect on plant operation or coolic safety. 1 7 8 9 80 C DE CODE SU8C E COMPONENT CODE SUBCOdE SU E 10l9l 7 8 lIIAlh W h lZlh lI lN lS l T l R l U l@ (_T_jh W h 9 10 11 12 13 18 19 20

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3 Docket 50-305 LER 81-018 Supplemental Information - Item 27 Cause, Description and Corrective Actions Instrument drif t appears to have caused the transmitter to be out of cali-b ration. However, a 13% drif t would have caused a 100 psig difference in pressure readings in the control room. This would have exceeded the maximum allowed difference between transmitters permitted by our daily surveillance check. .1 review of the daily lots showed that 100 psig difference did not exist during operations.

The direct cause of the drif t cannot be identified, but we conclude tne shutdown to refueling conditions was indirectly responsible. The sensing lines were flushed, the amplifier replaced, and the transmitter recalibrated with no indications of failure.

rJUN 15 1981

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