ML19317F402

RO 270/77-03:on 770215,reactor Bldg Pressure Transmitter Channel 2 2BS4-PT2 Found Out of Calibr.Cause Unknown. Transmitter Recalibr.No Evidence of Setpoint Drift

ML19317F402
Person / Time
Site:	Oconee
Issue date:	03/17/1977
From:	DUKE POWER CO.
To:
Shared Package
ML19317F399	List: ML19317F398 ML19317F402
References
RO-270-77-03, RO-270-77-3, NUDOCS 8001140651
Download: ML19317F402 (1)

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- DUKE POWER CO'fPANY LOCO 2EE UNPt'2-

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7 Report'No'.: .RO-270/77-3

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Report Date_: cMarch 17, 1977 Occurrence Date: ' February.15,-1977 Facility:_ L 0conee Unit 2, Seneca, South Carolina Reactor Building pressure transmitter

~ Identification of Occurrence: out of calibration

-Unit 3! 100 percent full power

' Conditions Prior to Occurrence:

Description of Occurrence:

On February ~ 15, 1977, while-performing a comparison of readings on the

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three Reactor Building narrow range pressure transmitters, a difference-of 0.6' psi was noted. Investigation revealed that Reactor Building narrow range pressure transmitter Channel 2 2BS4-PT2, was set less conservative than the'setpoint specified in Oconee Technical Specifica-tion 2.3. The pressure transmitter was promptly'recalibrated to the required specifications.

Apparent Cause of Occurrence:

Examinations of E The cause of this inci kat has not been determined.

the Reactor Building pressure transmitters ~were made periodically over a one week' span of time to determine if the transmitters were experienc-

.ing drift'but no-indications-of-setpoint drift were found.

Analysis of Occurrence:

'The. Reactor Building pressure is sensed by three redundant pressure

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trunsmitters which provide inputs to the Engineered' Safeguards

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(ES) set l ~being h

, system...This incident resulted in;one of the three c anne s i d

--slightly. less conservative et 5.6 psi rather than at 4 psi as requ The two redundant channels of re by Oconee Technica1' Specification 2.3.

the Reactor Building pressure transmitters assure tnat

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It isthe ' required therefore

{ inputs-to the ES system.would have been' supplied.

considered:that;the health'and safety of the public were not affected JbyJthis occurrence.

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Corrective-Action:

The Channeli2 Reactor Building pressure transmitter was recalibrated to A check of all three pressure transmitters ithe'requirad specifications.

wasi made'and the~ Reactor Protective System'setpoints were verified to

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ube within~ Technical Specifi:ation limits.

. Examinations of f the :three jeacter Building pressure transmitters were a iperiodicallyLmade over' a one week time span to ' determine .if the :trans-mitters werejexperiencing any drift..'No; evidence of setpoint. drift was

" discovered. L ' No1 further -corrective " action is considered necessary.

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