ML19316A533

LER 78-001/01T-0:on 780113,both Level Instruments on Core Flood Tank 2A Found Out of Calibr.Cause Unknown.Both Channels of Level Instrumentation Calibr & Returned to Svc

ML19316A533
Person / Time
Site:	Oconee
Issue date:	02/10/1978
From:	Ken Wilson DUKE POWER CO.
To:
Shared Package
ML19316A531	List: ML19316A529 ML19316A533
References
LER-78-001-01T-0, LER-78-1-1T, NUDOCS 8001100691
Download: ML19316A533 (2)

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O DUKE POWtR COMPANY OCONEE UNIT 2

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Report No.: R0-270/78-1 Report Date: February 10, 1978 Occurrence Date: January 13, 1978 Facility _:

Oconee Unit 2, Seneca, South Carolina Core Flood Tank 2A Level Instruments Inoperable Description of Occurrence:

Cold Shutdown Conditions Prior to Occurrence _:

Description of Occurrence:

During the performance of procedure IP/0/A/201/lA, both level instruments on Core Flood Tank One 2A were channeldetermined to be out of of level instrumentation wascalibration indicating in the n conservative direction.the other by 0.45 feet. By Specification 3.3.6, only high by 0.34 feet,one level instrument may be inoperable during operation above 800 Both instruments were calibrated and returned to operation.

Apparent Cause of Occurrence:

These instruments were There was no apparent cause for the occurrence.

last calibrated during the previous refueling outage.

Analysis o-f 0ccurrence:

The core flood system is one of three means designed to provide emergency core cooling (ECCS), the others being the high all of andsystems these low pressure would injection have systems.

In the event of an accident, The combined operated to maintain the core covered and to cool the core.

volume of water in both core flood tanks was always above the minimum amount required. Thus, the health and safety of the public were not en-

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dangered.

Corrective Action:

Both channels of level instruments were calibrated and returned to operation.

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li f ililill f i l Nwe ce rmErAnen K. R. Wilson ,sey, (704) 373-8197