ML20038B022

LER 81-015/03L-2:on 810510,during Refueling Shutdown,Steam Flow Transmitter Was Out of Calibr Resulting in Less Conservative Hi & hi-hi Steam Flow than Required.Caused by Instrument Drift

ML20038B022
Person / Time
Site:	Kewaunee
Issue date:	11/16/1981
From:	Molzahn D WISCONSIN PUBLIC SERVICE CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20038B021	List: ML20038B020 ML20038B022
References
LER-81-015-03L, LER-81-15-3L, NUDOCS 8111240610
Download: ML20038B022 (2)

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60 68 DOCKET NUM3EH 68 6'1 EVENT DATE 74 75 REI'OnT DATE 80 EVENT DESCRIPT!ON AND PROBABLt CONSEQUENCES h o l 2 l l Surveillance testing during refueling shutdown indicated that one steam flow transmitteg

, g was out of calibration resulting in Hi Steam Flow and Hi-Hi Steam Flow trip settings g

,  ; less conservative than T.S. requirements. TS 3.5.a. The other channels of steam flow g

, instrumentation were operable within T.S. lir.its and would have initiated steam line y

, isolation a s required. There was no ef fect on plant operation or public saf ety. ,

, , Occurrences of instrument drif t have been previously reported, y Olhl l l 8 9 80 SYSTEM CAUSE CAUSE CO'.t P.

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D. J. Malzahn (414) 388-2560 o NAME OF PREPARER PHONE:

• B Instrumentation drif t of the Barton Steam Flow Transmitter caused it to be in an out of calibratian condition. The transmitter was recalibrated and returned to service.

c A records review of the safety related Barton transmitters was conducted to identify calibration drif t characteristics. Where operational restrictions allou ndditional conservatism, the setpoints had previously been changed.

The drif t cannot be accurately predicted. These transmitters are presently within the scope of the equipment qualification program (IEB 79-OlB) and will be changed out as part of the long teza upgrade of transmitters. Because of redundancy of instrumentation for ESI activation no further action is required at thi/ time.