05000321/LER-1981-019-03, /03L-0:on 810305,LPCI Valve Selection Timing Relays 1E11-K81A & B Were Found to Actuate Sooner than Tech Spec Requirements.Caused by Setpoint Drift.Instruments Recalibr & Returned to Svc

/03L-0:on 810305,LPCI Valve Selection Timing Relays 1E11-K81A & B Were Found to Actuate Sooner than Tech Spec Requirements.Caused by Setpoint Drift.Instruments Recalibr & Returned to Svc

ML20003E201
Person / Time
Site:	Hatch
Issue date:	03/27/1981
From:	Nix R GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003E199	List: 05000321/LER-1981-019, Forwards LER 81-019/03L-0 05000321/LER-1981-019-03, /03L-0:on 810305,LPCI Valve Selection Timing Relays 1E11-K81A & B Were Found to Actuate Sooner than Tech Spec Requirements.Caused by Setpoint Drift.Instruments Recalibr & Returned to Svc
References
LER-81-019-03L, LER-81-19-3L, NUDOCS 8104020499
Download: ML20003E201 (2)

LER-1981-019, /03L-0:on 810305,LPCI Valve Selection Timing Relays 1E11-K81A & B Were Found to Actuate Sooner than Tech Spec Requirements.Caused by Setpoint Drift.Instruments Recalibr & Returned to Svc

Event date:
Report date:
3211981019R03 - NRC Website

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U NRC f ORM 366 U. S. NUCLE AR REGULATORY COMMISSIOiJ (7 7))

LICENSEE EVENT REPORT

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EVE NT DATE 14 15 REPORT DAT E 80 EVENT DESCRIPTION AND PROB \\BLE CONSEQUENCES h o 2 l While the,.'

..t was in cold shutdown, 1E11-K81A&B, LPCI Valve Selection

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[o ;3] l Timing Relays, were found to actuate at 529.55 seconds and 562 seconds I

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respectively.

Tech Spec Section 3.2-5, Item 9, requires actuation at l

lo ist i 210 minutes (600 seconds).

Redundant ECCS systems were operable. Plant l

]o lo i l operation was not affected.

The health and safety of the public was not l

1017 I l affected. This is a non-repetitive event.

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3J 34 3S 36 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 11101l The cause of this event has been attribut3d to setpoint drift. The l

li lii l instruments were recalibrated and returr.ed to service.

The surveillance I

g3 g2; I test was then performed with satisfa' tory results.

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LER Ho. : 50-321/1981-019 Licensee: Georgia Power Company facility: Edwin I. Hatch Docket No. : 50-321

Narrative

Report for LER 50-321/1981-019 On March 5,1981, IE11-K81A was found to actuate at 529.55 seconds. C7 March 10,1981, IE11-K81B was found to actuate at 562 seconds.1E11-K31A&B are Agastat Pneumatic Time Delay Relays that serve as the LPCI Valve Selection Timers.

The plant was in cold shutdown when these events occurred. Tech' Spec Section 3.2-5, Item 9, requires actuation at 310 minutes (600 seconds).

1 The cause of.this event has been attributed to setpoint drift.

The instruments were recalibrated and returned to service immediately upon

. discovery. Surveillance t st was performed with satisfactory results.

A generic review revealed no inherent problems.

This type of Agastat Relay has not previously been prone to setpoint drift problems.

This type of relay is also used for this service on Hatch Unit II.

Plant operation was not affected as a result of this event.

The health and, safety of the public was not affected.

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