05000366/LER-1981-031-03, /03L-0:on 810409,shutdown Cooling Mode Switch Found to Actuate at 164 Psig.Caused by Setpoint Drift.Switch Recalibr

/03L-0:on 810409,shutdown Cooling Mode Switch Found to Actuate at 164 Psig.Caused by Setpoint Drift.Switch Recalibr

ML19343D356
Person / Time
Site:	Hatch
Issue date:	04/28/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19343D352	List: 05000366/LER-1981-031, Forwards LER 81-031/03L-0 05000366/LER-1981-031-03, /03L-0:on 810409,shutdown Cooling Mode Switch Found to Actuate at 164 Psig.Caused by Setpoint Drift.Switch Recalibr
References
LER-81-031-03L, LER-81-31-3L, NUDOCS 8105040336
Download: ML19343D356 (2)

LER-1981-031, /03L-0:on 810409,shutdown Cooling Mode Switch Found to Actuate at 164 Psig.Caused by Setpoint Drift.Switch Recalibr

Event date:
Report date:
3661981031R03 - NRC Website

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LICF.NSEE EVENT REPORT

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$7 CAT 58 s[R$ l Ll@l 0l 5 l 0 l 0 l 0 l 31 6 l 6 l@69l 0l 4 l 0 l 9l 8l 11@l014 f2 l'8 l 8 60 61 DOCKET NUMBER 68 EVENT DATE 74 7b REPORT DATE 80 7

8 EVENT DESGnlPTioN AND PROBABLE CONSEoUENCES h 1012 l l While the plant was in steady state operation at 1151 mit, 2B31-N018A, I

FTil I Reactor (Shutdown Cooling liode) Switch was found to actuate at 164 psig.

I 10 l41 1 Tech Spec Section 3.3.2-2 (6.b) required actuation is $135 psig +25 psig l

0 s L head correction.

Switch 2831-N018B in the redundant channel was operable l

[717] l and within tolerance. There was no effect on safe plant operation nor i

L was the health and safety of the public affected by this incident. This I

O 7 iOlRi l is a repetitive event a; last reported on Reportable Occurrence 50-366/1981-020. l 60 7

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33 34 3b 36 31 40 43 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTloNS h lil0 l l The cause of this event has been attributed to seLpoint drift.

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Is lil i was recalibrated per HNP-2-5279, Barksdale Pressure Switch Calibration, l

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'and functionally tested successfully per HNP-2-3102, Reactor High Pressure l

l i,i3i l (Shutdown Cooling flode) Functional Test and Calibration.

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' LER No. : 50-366/1981-031

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Licensee:, Georgia Power Company r

Facility: Edwin :I ~ Hatch

.. Docket No.: 50-366

Narrative

Report

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.for LER 50-366/1981-031.

1 On April 9,1981, while the plant was in steady' state operation at '1151 MWt,-

2831-N018A, Reactor Pressure (Shutdown Cooling Mode) switch was found to

, actuate at 164-psig increasing prersure. ' Tech Specs Table:3.3.2-2, Item "6.b, requi'res switch actuation at less than or equal to '135 psig +25 head

. correction. The redundant switch, 2831-N0183, was found. to be operable:,

<and actuating within expected tolerance.

Plant operation nor public' n..

i

- health and safety were affected.

This is 'a repetitive event as last reported a

on Reportable Occurrence Reportlo. 50-366/1981-020.

4 The cause of this event has been attributed to setpoint drift. The switch was recalibrated per HNP-2-5279, Barksdale Pressure Switch Calibration,,.

J then functionally tested successfully per HNP-2-31-2, Reactor High: Pressure L(Shu.tdown Cooling Mode) Functional Test and Calibration, and returned to

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- A generic review revealed no inherent problems ~with.this switch for this particular application.

Unit I does not use this type of switch for this

'O application, but these type switches are used on both units for-safety related functions and have a previous history for s'etpoint drift.

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