05000321/LER-1981-062-03, /03L-0:on 810630,during Normal Operations, Isolation Valve for drywell-to-torus Sys Differential Pressure Instruments Found Closed,Isolating Instruments. Caused by Personnel Error.Valve Position Corrected

/03L-0:on 810630,during Normal Operations, Isolation Valve for drywell-to-torus Sys Differential Pressure Instruments Found Closed,Isolating Instruments. Caused by Personnel Error.Valve Position Corrected

ML20009F021
Person / Time
Site:	Hatch
Issue date:	07/15/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20009F015	List: 05000321/LER-1981-062, Forwards LER 81-062/03L-0 05000321/LER-1981-062-03, /03L-0:on 810630,during Normal Operations, Isolation Valve for drywell-to-torus Sys Differential Pressure Instruments Found Closed,Isolating Instruments. Caused by Personnel Error.Valve Position Corrected
References
LER-81-062-03L-01, LER-81-62-3L-1, NUDOCS 8107280611
Download: ML20009F021 (2)

LER-1981-062, /03L-0:on 810630,during Normal Operations, Isolation Valve for drywell-to-torus Sys Differential Pressure Instruments Found Closed,Isolating Instruments. Caused by Personnel Error.Valve Position Corrected

Event date:
Report date:
3211981062R03 - NRC Website

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lo 1211 Durina steady state power operation it was discovered that the isolationi 10 lal I valve for the drywell-to-torus system differential pressure instruments l

lo 141 l (T48-N081, N082, N083) was closed, thereby isolating the instruments.

I lo Isl i Redundancy was available although the instru.ments were isolated.

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LER #:

50-321/1981-062 Licensee:

Georgia Power Company Facility Name:

Edwin I. Hatch Docket #:

50-321

Narrative

Report for LER 50-321/1981-062 During steady state power operation it was discovered on 6-30-81, that the low side isolation valve for the drywell-to-torus system differential pressure instruments (T48-N081,

N082, and N083) was closed, thereby isolating the instrum-ents.

The functions of these instruments were, respectively, as follows:

1.

initiation of the differential pressure pump in the event of a low D/W-to-torus differential pressure; 2.

low lifferential pressure alarm, and 3.

opening of a valve (T48-F204) to allow the system to go into a recirc mode, thereby stopping pressurization, in the event of a

high differential pressure.

Upon discovery of the event recorder charts (T48-R631AGB) that monitor the D/W-to-torus differential pressure were reviewed, and it was determined that the D/W-to-torus differential pres-sure did not decrease below the 1.5 psi setpoint.

The fact that these charts are reviewed each shift would have prohibit-ed a pt Mntial undetected high or low D/W-to-torus differen-tial pre sure.

Also a redundant. valve (T48-F205) was availa-ble for the recirc mode in the event of a high differential pressure.

The cause of the event was apparently due to the failure to follow procedure during the attempts to perform test or exper-iment request #80-5 on 6-4-81.

Investigation revealed that the valve was closed per the TER and not restored to normal.

This was caused by the fac.t that the test performance was aborted due to procedural problems and the fact that the test steps were not signed off per plant procedures in a chronolog-ical fashion.

The event was discovered during the performance of an unrelat-ed surveillance as a result of the observation by a site qual-ity control inspector.

'n7 valve was returned to normal, and i

the associated reporting of the event was initiated.

The associated personnel have been reminded of the importance of complete adherence to procedures.