05000321/LER-1980-019-03, /03L-0:on 800213,while Performing Reactor Core Isolation Cooling Turbine Exhaust Diaphragm Functional Test & Calibr,Pressure Switches 1E51-N012B & 1E51-N012C Found Outside Tech Spec Limits.Caused by Setpoint Drift

/03L-0:on 800213,while Performing Reactor Core Isolation Cooling Turbine Exhaust Diaphragm Functional Test & Calibr,Pressure Switches 1E51-N012B & 1E51-N012C Found Outside Tech Spec Limits.Caused by Setpoint Drift

ML19344D325
Person / Time
Site:	Hatch
Issue date:	03/04/1980
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19344D323	List: 05000321/LER-1980-019, Forwards LER 80-019/03L-0 05000321/LER-1980-019-03, /03L-0:on 800213,while Performing Reactor Core Isolation Cooling Turbine Exhaust Diaphragm Functional Test & Calibr,Pressure Switches 1E51-N012B & 1E51-N012C Found Outside Tech Spec Limits.Caused by Setpoint Drift
References
LER-80-019-03L, LER-80-19-3L, NUDOCS 8003110673
Download: ML19344D325 (2)

LER-1980-019, /03L-0:on 800213,while Performing Reactor Core Isolation Cooling Turbine Exhaust Diaphragm Functional Test & Calibr,Pressure Switches 1E51-N012B & 1E51-N012C Found Outside Tech Spec Limits.Caused by Setpoint Drift

Event date:
Report date:
3211980019R03 - NRC Website

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LICENSEE EVENT REPORT CONTnOL ot ock:

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60 61 DOCKE T NUVUEH ul 60 EVENT DATE 14 7b HEPORT DAT E 80 EVENT DESCFilPTION AND PROB ABLE CONSEQUENCES h o 2 l While performing RCIC Turbine Exhaust Diaphragm Functional Test and Cali-l 1013l 1 bration, pressure switches 1E51-N012B and IE51-N012C were found outside l

lo l4 ] l Tech Spec limits. The setpoint of the above switches is 8 psig 1 in-l

,; 7 : 7;i cn osing. Switch B was found at 12 psig and Switch C was found at 11 psig.

l g g-') l This is a repetitive occurence; Reference LER 50-321/1978-096. There was l

ypl no ef fect on safe plant operation or upon public health or safety.

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40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h i O l 1E51-N012B and 1ESI-N012C failed to meet Tech Spec limits due to setpoint l

lift] l drift.

Instruments were calibrated per Barksdale Pressure Switch Cali-l 1 7 l bration and functionally tested.

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NARRATIVE

REPORT

' Georgia Power Company Plant E. 1. llatch Bax1cy,, Georgia 31513 Reportable Occurrence Report No. 50-321/1980-019.

With' the reactor in the run mode at 2223 MWt power and while performing HNP-1-3414, RCIC Turbine Exhaust Diaphragm Functional Test and Calibration, instruments '1E51-N012B and IE51-N012C, Turbine Exhaust Diaphragm Pressure Switches,were found to be out of. Tech Spec limits. The switches were found at 12 psig increasing and 11 psig increasing respectively.

Expected setpoint is 8 psig Il increasing. Acceptance criteria is 5 10 psig increasing.

The cause of this occurrence has been attributed to instrument-drift. The

- instruments were recalibrated per HNP-1-5279, Barksdale Pressure Switch Calibration, and returncd to service.

Surveillance procedure HNP-1-3414,

' RCIC Turbine Exhaust Diaphragm Functional Test and Calibration, was performed again and was acceptable. This is a repetitive occurrence per LER 50-321/1978-096; however, this is not a generic problem.

The operation of the plant was not affected. There were no effects upon public health and safety due to this event.

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