05000321/LER-1981-034-01, /01T-0:on 810423,during Surveillance Walkdown of Pipe Supports Per IE Bulletin 79-14,support G31-RWCU-58 Failed Functionality Criteria.Caused by Undersized Spring in Support Due to Design Error.Spring & Can Will Be Replaced

/01T-0:on 810423,during Surveillance Walkdown of Pipe Supports Per IE Bulletin 79-14,support G31-RWCU-58 Failed Functionality Criteria.Caused by Undersized Spring in Support Due to Design Error.Spring & Can Will Be Replaced

ML20003H995
Person / Time
Site:	Hatch
Issue date:	04/30/1981
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20003H992	List: 05000321/LER-1981-034, Forwards LER 81-034/01T-0 05000321/LER-1981-034-01, /01T-0:on 810423,during Surveillance Walkdown of Pipe Supports Per IE Bulletin 79-14,support G31-RWCU-58 Failed Functionality Criteria.Caused by Undersized Spring in Support Due to Design Error.Spring & Can Will Be Replaced
References
IEB-79-14, LER-81-034-01T, LER-81-34-1T, NUDOCS 8105080302
Download: ML20003H995 (2)

LER-1981-034, /01T-0:on 810423,during Surveillance Walkdown of Pipe Supports Per IE Bulletin 79-14,support G31-RWCU-58 Failed Functionality Criteria.Caused by Undersized Spring in Support Due to Design Error.Spring & Can Will Be Replaced

Event date:
Report date:
3211981034R01 - NRC Website

text

mHC FORM 366 (7 77)

LICENSEE EVENT REPORT 1

CONT ROC OLOCK: l l

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68 69 EVENT DATE 14 J5 REPORTDATE 50 S

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8 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10n 4-22-81, The AE conducted a surveillance walkdown nf ninn sunnnrte I

O 2 i o,3, g per IEB 79-14.

On 4-23-81, it was discovered that support G31-RWCU-58 I

This is a repetitive I

l f ailed the functionality criteria for IEB 79-14.

o 4 see LER 50-321/1981-029.

There were no effects on public 1

go,s,l occurrence -

go jc i g health or safety.

Unit one was already shutdown for a refueling / torus l

go j,l l modification outage.

fio system operability was af fected.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 11101IThe spring in support was undersized due to desion error.

The snrinn I

ran willi lwill bottom out under thermal plus seismic loadino.

Snring and i i This will be done prior to _j jbe replaced to allow proper pipe movement.

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l Unit l's startup following the outage such that the requirements of I

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LER #:

50-321/1981-034" Licensce:

Georgia Power Company-Facility Name:

Edwin.I. liatch-Q Docket #:

50-321

Narrative

Report for LER 50-321/1981-034 On 4-22-81, with Unit 1 shutdown for a refueling / torus modif-ication outage the AE conducted a surveillance walkdown' of pipe supports per IEB 79-14.

On _'4 - 2 3-81, the site was notif-ied by the AE that support G31-RWCUll-58 failed functionality criteria for IEB 79-14.

This is - the support a repetitive occurrence - see LER 50-321/1981-029.

There were no effects on public health or safety.

No system operability was affect-ed.

The spring in support G31-RWCUll-58 was undersized due to design error.

The spring will bottom out under thermal plus scismic loading.

Spring and can will be replaced to allow proper pipe movement.

This will be done prior. to Unit l's startup following the outage such that the requirements of Tech Specs 6.9.1.8.i are satisfied.

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