05000321/LER-1981-045-03, /03L-0:on 810526,vacuum Relief Valves T48-F310 & F328A Found Leaking Excessively During Local Leak Rate Test. Caused by Leaking o-ring & t-ring.Rings Replaced,Valves Reassembled & Retested

/03L-0:on 810526,vacuum Relief Valves T48-F310 & F328A Found Leaking Excessively During Local Leak Rate Test. Caused by Leaking o-ring & t-ring.Rings Replaced,Valves Reassembled & Retested

ML20004F799
Person / Time
Site:	Hatch
Issue date:	06/16/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20004F798	List: 05000321/LER-1981-045, Forwards LER 81-045/03L-0 05000321/LER-1981-045-03, /03L-0:on 810526,vacuum Relief Valves T48-F310 & F328A Found Leaking Excessively During Local Leak Rate Test. Caused by Leaking o-ring & t-ring.Rings Replaced,Valves Reassembled & Retested
References
LER-81-045-03L-01, LER-81-45-3L-1, NUDOCS 8106220409
Download: ML20004F799 (2)

LER-1981-045, /03L-0:on 810526,vacuum Relief Valves T48-F310 & F328A Found Leaking Excessively During Local Leak Rate Test. Caused by Leaking o-ring & t-ring.Rings Replaced,Valves Reassembled & Retested

Event date:
Report date:
3211981045R03 - NRC Website

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uJ EVLN T DATL 14 7b HEPOH1 DAlt t<0 EVENT DESCHIPTioN AND PHoDADLE CONSEQUENCES h o 2 10n 5-25-81, with Unit 1 shutdown for a refueling / torus modification out-l l age LLRTs of the vacuum relief valves T48-F310 and F328A were performed.l o 3 lo.141~10n 5-26-81, the LLRT coordinator reviewed the data sheets, ' and it was I

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o s o o 1.60 La overall allowable limit of Tech Specs 4.7. A.2.G to be exceeded.

I lo l71 IThis is a repetitive occurrence - refer to LER 50 321/1981-038.

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33 34 3b 3G 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 11101 l An investigation conducted determined that the "0"

ring on the T48-F328Al 1 121 l valve and the "T"

rino on the T48-F310 valve were leakina.

These were I

i 121 l replaced.

Both valves were reassembled, retested, and left at a leakagel lil3l l of 400 accm.

The unit is now in full compliance with the requirements 04 l Tech Specs 4.7.A.2.G, and no further reporting is required.

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50-321/1981-045 Licensec:

Georgia' Power Company Facility Name:

Edwin I. Ilatch

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50-321 4

Narrative

Report for LER 50-321/1981-045 On 5-25-81, with Unit i shutdown ~ for a. refueling / torus modif-ication ' outage LLRTs of the vacuum relief valves T48-F310 and F328A were performed per'l!NP-1-3952, Primary Containment Peri-odic Type ' B and Type C Leakage Tests.

On 5-26-81, the data sheets were reviewed by the LLRT coordinator, and it was determined that the valves were 1 caking such that it would

cause

the.60 La_overall allowabic leakage limit of Tech Specs 4.7.A.2.G to be exceeded (as found leakage:

test volume would not pressurize).

This is is a repetitive occurrence - refer to-LER 50 321/1981-038.

There were no effects on public health or safety due to this event.

An investigation was conducted to determine the cause of -the valves leaking.

The "0" ring on T48-F328A had worn and so had the "T"

rings on T48-F310.

These "0"

and "T"

rings were replaced and valves were reassembled.

The valves were then successfully. rctested (as 1cft:

400 accm).

The unit is now in full compliance with the requirements of Tech Specs 4.7.A.2.G, and no further reporting is required.

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