05000321/LER-1981-085-03, /03L-0:on 810805,reactor Core Isolation Cooling Steamline Switch Found to Actuate Above Tech Spec Limit. Caused by Setpoint Drift.Barton Model 288 Recalibr & Returned to Svc

/03L-0:on 810805,reactor Core Isolation Cooling Steamline Switch Found to Actuate Above Tech Spec Limit. Caused by Setpoint Drift.Barton Model 288 Recalibr & Returned to Svc

ML20010E703
Person / Time
Site:	Hatch
Issue date:	08/25/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010E701	List: 05000321/LER-1981-085, Forwards LER 81-085/03L-0 05000321/LER-1981-085-03, /03L-0:on 810805,reactor Core Isolation Cooling Steamline Switch Found to Actuate Above Tech Spec Limit. Caused by Setpoint Drift.Barton Model 288 Recalibr & Returned to Svc
References
LER-81-085-03L, LER-81-85-3L, NUDOCS 8109080170
Download: ML20010E703 (2)

LER-1981-085, /03L-0:on 810805,reactor Core Isolation Cooling Steamline Switch Found to Actuate Above Tech Spec Limit. Caused by Setpoint Drift.Barton Model 288 Recalibr & Returned to Svc

Event date:
Report date:
3211981085R03 - NRC Website

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NRC FORM 366 U. S. NUCLE AR REGULATORY COMMISSION i

(7-77) o LICENSEE EVENT REPORT CONTROL BLOCK: l l

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION ANE. PROBABLE CONSEQUENCES h 1012j l With the plant at steady state operation of 2394 MWt,1E51-N017, RCIC l

lOi3i l Steamline AP switch, was found to actuate at +201" of H20. Technical l

10!41 [

Specifications Section 3.3.2 requires actuation at +198" of Hp0. Redun-l IO isi i dant switch 1E51-N018 was operable and in tolerance. Plant operation nor l

lO is i l the public's health and safety was affected as a result of this event.

l l0 l7l l This is a repetitive event as last reported on Reportable Occurrence 1

4 O i8 i l Report No.50-321/1979-085.

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40 di 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h li101l The cause of this event has been attributed to setooint drift. The I

li 111 I instrument. a Barton Model 288. was recalibrated anc' returned tO service.

I 13 l2l l An instrument functional test was performed with satisfactor_y results.

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a LER No.: 50-321/1981-085 Licensee:. Georgia Power Company.

Facility: Edwin I. Hatch Docket No. : 50-321

Narrative

Report for LER 50-321/1981-085.

On August 5,1981, with the plant at steady state power of 2394 ffWt, 1E51-N017, RCIC Steamline AP switch was found to actuate at +201" of H 0; Technical. Specifications Section 3.3.2 requires actuation at-2

'5300% steamline flow which is equal" to -+193"tof -H20.

Redundant.RCIC steamline hP switch 1E51-N018 was operable and in tolerance. This is a repetitive event as~last ' reported onf Reportable 0ccurrence Report do. 50-321/1979-085.,

The cause of this event has be.. attributed;to setpoint drift. The instrument, a Barton f(odel 288,'was recalibrated and placed back into service. An instrument functional test was~ performed with satisfactory results.

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Unit II uses the same type of instrument for this application. A generic-review revealed no inherent problems.

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