05000366/LER-1980-139-01, /01T-0:on 801008,AE Notified of Improper Placement of Anchor 2Gll-RAD-A91,resulting in Seismic Vulnerability of Containment Isolation Valve 2G11-F020.Caused by Failure to Follow Original Design.Order to Close Valve Issued

/01T-0:on 801008,AE Notified of Improper Placement of Anchor 2Gll-RAD-A91,resulting in Seismic Vulnerability of Containment Isolation Valve 2G11-F020.Caused by Failure to Follow Original Design.Order to Close Valve Issued

ML19338G048
Person / Time
Site:	Hatch
Issue date:	10/21/1980
From:	Coggin C GEORGIA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19338G047	List:
References
LER-80-139-01T, LER-80-139-1T, NUDOCS 8010280377
Download: ML19338G048 (2)

LER-1980-139, /01T-0:on 801008,AE Notified of Improper Placement of Anchor 2Gll-RAD-A91,resulting in Seismic Vulnerability of Containment Isolation Valve 2G11-F020.Caused by Failure to Follow Original Design.Order to Close Valve Issued

Event date:
Report date:
3661980139R01 - NRC Website

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LICENSEE EVENT REPORT CoNTF oL BLOCK: !

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b'J LVLN1 OAlE 74 75 RE POR T D AT L FJ EVENT DESCRIPTION AND FRoBAULE CONSEQUENCES h 10121 l During normal power operation on 10-8-80, notification was received fromi 10 l31 l the AE that the drywell equipment drain sump discharge to radwaste pip-l

[ TIT 1 l i ng is not seismic beyond anchor 2G11-RAD-A91.

Therefore, outboard con-1 fii 1T1 I t a i nme n t isolation valve 2G11-F020 is not seismically protected.

Jhis I

lo lc ] I means tha t prima ry containment could potentially be-breached if an i

Io lil l earthquake, LOCA, and f ailure of inboard isolation valve 2G11-F019 all l

10 i l occurred at once.

This is a nonrepeti tive event.

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CAUSE

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This appears to be an installation error.

Corrective action I is121lhas been the issuance of a standing order to close valve 2G1:-F018 in I

li131 l the concurrent event of an earthquake and LOCA.

A design package is I

li ta l l expected f rom AE to restore seismic capability to this pipe.

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- LER #:

50-366/1980-139 Licensee:

Georgia.Fower Company Facility Name:

Edwin I.

Hatch Docket #:

50-366

Narrative

Report for LER 50-366/1980-139 4

4 l

During steady state power operation -(at 2393 MWt) on 10-8-80~,

notification 'was received' from the AE that the drywell 4

equipment drain sump discharge to.

radwaste ~ piping is not scismic beyond anchor' 2Gll-RAD-A91.

This was determined by computer reanalysis of the piping following surveillance walkdown per IEB 79-14.

Therefore, outboard containment isolati.on valve- '2Gil-F020 is~ not seismically supported _ such that. p r im ary ' ' c on t a inm e n t integrity could be-degraded by an earthquake.

This is a nonrepetitive event, and there -was no effect upon public health or safety as a result of this event.

j Continued operation in the present condition can be justified as follows unt'il:t.he fix can be made:

l 1

1.

a seismic event would. be required to potentially cause i

the loss of 2Gil-F020;

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2.

the containment isolation valves 2Gil-F019 and 2Gil-F020 i

close on high drywell

pressure, main steam line low pressure,'or low reactor water Icvc1; i

.3.

in case 'of a single active f ailure of the inboard valve

2Gll-F019 remote manual isolation capability is provided i

.by the'in-containment-valve 2G11-F018; 4.

the-probability of a concurrent seismic event, a -LOCA, 4

and a

singic active failure of valve 2Gil-F019 is extremely remote.

In addition, remote manual capability for the line.is still-provided.

Note' va lve s ' 2Gil-F019 and 2Gil-F020 were erroneously reported in 'our fprompt notification and telegram as being normally l-closed.

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The

cause

of the piping not being. seismic is that anchor.

2Gil-RAD-A91 is not in-the original. design location.

This.

appears to-be -the result of_-installation error and is a

nonrepetitivo event-Immediate corrective action consists of the:

issuance off standing order 80-52 which contains'

. ins truc tions to

'close-in-containment valve 2Gil-F018 to-1 isolate-the linc 'in the ' concurrent event of an earthquake and LOCA.

Site is presently awaiting a design package from the AE so 'that a design. change request can L be initiated to restore seismic capability to th i s-' pipe such that valve ~2Cll-F020 will the scismically' supported.-

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