05000270/LER-1978-001-01, /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

/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: 05000270/LER-1978-001, Forwards LER 78-001/01T-0 05000270/LER-1978-001-01, /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
References
LER-78-001-01T-0, LER-78-1-1T, NUDOCS 8001100691
Download: ML19316A533 (2)

LER-1978-001, /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

Event date:
Report date:
2701978001R01 - NRC Website

text

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O DUKE POWtR COMPANY OCONEE UNIT 2 Report No.:

R0-270/78-1 Report Date: February 10, 1978 Occurrence Date: January 13, 1978 Oconee Unit 2, Seneca, South Carolina Facility _:

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 2A were determined to be out of calibration in the One channel of level instrumentation was indicating 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 and low pressure injection all of these systems would have In the event of an accident, The combined systems.

operated to maintain the core covered and to cool the core.

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

- amount required.

dangered.

Corrective Action

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

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coeur EVENT DESCA!FT1oM ANo PRCS A8Li CCNSECUENCES Oia l o 121 l During the performance of procedure IP/0/A/201/1A, both level instruments on Core Flood Tank 2A were determined to be out of calibration in the non-j l a 121 l lo I.] l conservative direction.

One. channel of level instrumentation was indicating g io isi I high by 0.34 feet, the other by 0.45 feet.

By Specification 3.3.6, only one y o. I level instrument may be inoperable during operation above 800 psig.

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