ML19350D667

LER 81-034/03L-0:on 810422,reactor Core Isolation Cooling Suppression Chamber Area Differential Temp Switch 2E51-N604B Was Found to Actuate Higher than Tech Spec Requirements. Caused by Setpoint Drift.Switch Recalibr

ML19350D667
Person / Time
Site:	Hatch
Issue date:	05/14/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19350D621	List: ML19350D620 ML19350D667
References
LER-81-034-03L, LER-81-34-3L, NUDOCS 8105180316
Download: ML19350D667 (2)

Text

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EVENT DEscniPrioN ArJD PnODADLE CONSEQUENCES h o 2 i While the plant was in steady st ate operation at 2410 ftft, 2E51-N604B, [

io i3l l RCIC Suppression Chamber Area Differential Temperature Switch, was found l to actuate at 53 degrees F. Tech Specs 3.3.2-2(5.f) requires actuation i l o_ [ ] l o ., l of </=50 degrees F. Redundant temperature switch 2E51-N604A was found [

[ lo isi l to be within tolerance. Plant operation was not affected as a result of f (TITl I this event. The health and safety of the public was not affected. This [

is a non-repetitive event. I i O iR i l SO DE CODE SUBC E COMPONf.NT CODE SUBC D'E SU E O 9 i Cl El@ [E__l@ l E l@ l I l N l S l T I R l U l@ [S_j@ [Z_J 20

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43 44 4p CAUSE DESCRIPTION AND CORHECTIVE ACTIONS The cause of the event has been attributed to setnoint drift, The temoera- I ml i i l ture switch was recalibrated per HNP-2-5235. Transmation 610 and 630 Temper- I i

i l ature Switch Calibration, and functionally tested successfully per H.iP

• I i 3 l 3407, Suppression Chamber Delta T (RCIC) Instrumentation Functional Test l

[TTTI 'l and Calibration, and returned to service. 1 I 8 9 .

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, ,i n. .n ..u R. T. Nix, Supt. of ttaintenance pgong 912-367-7731 't u NAME Of PHI PAHLH

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LER !!o.: 50-366/1981-034 Licensce: Georgia Power Company facility: Edwin I. Hatch Docket flo. : 50-366 ilarrative Report for LER 50-366/1981-034 On April 22, 1981, with the plant in steady state operation at 2410 Mut and while performing flitP-2-3407, Suppression Chamber Delta T (RCIC)

. Instrumentation Functional Test and Calibration, RCIC Suppression Chamber Area Differential Temperature Switch, 2E51-il604B, was found to actuatc at 53 degrees F. Tech Specs 3.3.2-2, Item 5.f requires switch actuation of

</=50 degrees F. Redundant temperature switch 2E51-f!604A was found 'to be within tolerance. Plant operation was not affected as a result of this event; The health and safety of the public was not affected. This is a non-repetitive event.

The cause of this event has been attributed to setpoint drift. The temperature switch was recalibrated per HilP-2-5235, Transmation 610 and 630 Temperature Switch Calibration, then functionally tested successfully ,

per HNP-2-3407, Suppression Chamber Delta T (RCIC) Instrumentation Functional

. Test and Calibration and returned to service. '

A generic review revealed no inherent problems with this switch for' this particular application. Unit I uses this type of temperature switch for this application.

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