05000321/LER-1979-103-03, /03L-0:on 791227,while Performing Surveillance on Reactor Core Isolation Cooling Sys Flow Instrument,High Switch Exceeded Tech Specs.Caused by Instrument Drift.Switch Was Recalibr & Surveillance Performed Satisfactorily

/03L-0:on 791227,while Performing Surveillance on Reactor Core Isolation Cooling Sys Flow Instrument,High Switch Exceeded Tech Specs.Caused by Instrument Drift.Switch Was Recalibr & Surveillance Performed Satisfactorily

ML19257B988
Person / Time
Site:	Hatch
Issue date:	01/17/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19257B979	List:
References
LER-79-103-03L-01, LER-79-103-3L-1, NUDOCS 8001220503
Download: ML19257B988 (2)

LER-1979-103, /03L-0:on 791227,while Performing Surveillance on Reactor Core Isolation Cooling Sys Flow Instrument,High Switch Exceeded Tech Specs.Caused by Instrument Drift.Switch Was Recalibr & Surveillance Performed Satisfactorily

Event date:
Report date:
3211979103R03 - NRC Website

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60 61 DOCh E T NUP/dEH 68 69 EklM DATE 74 75 HEPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l During cold shutdown and while performinn normal surveillance on the RCIC system flow I o 2 I o 13 J instrument, 1E51-N002. the high switch was found at 8.1 in. U20.

This exceeds Tech-l lo la 1 nical Specification Table 3.2-3, Item 6, which states that the high setpoint should j

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This is a repetitive occurrence as reported

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loisI be greater than 80 gpm, 8.96 in.

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Iolc] ! last on LER 50-321/1979-102. There was no effect on public health or safety.

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34 40 43 42 43 44 47 cAUSE DESCmPTION AND CORRECTIVE ACTIONS l The switch being out of tolerance was attributed to instrunept drift.

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g, y l Switch, and the surveillance procedure, HNP-1-3404, RCIC System Flos Instrument l

Functional Test and Calibration was performed satisfactorily.

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NARRATIVE

REPORT Georgia Power Company Plant E.

I. llatch Baxley, Georgia 31513 Reportable Occurrence Report No. 50-321/1979-103 During cold shutdawn and while perfonning normal surveillance on die RCIC System Flow Instrument, IE51-N002, the high switch was found at 8.1 in I

H20 This exceeds Technical Specifications Table ],2-3, Item 6, which states H 0.

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that the high setpoint should be greater than 80 gpm, 8.96 in.

2 is a repetitive occurrence.

l The switch was recalibrated per IINP-1-5202, Barton Model 288A and 289A Dif ferential Indicating Switch, and the surveillance procedure was performed satisfactorily.

The switch being out of tolerance was attributed to instrument drift.

This type of instrument is utilized in other systems on both units, but no generic problens have been discovered at this time.

Investigations will continue and a follow-up report will be subnitted.

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