ML19318A651

RO 50-321/1980-062:on 800612,w/facility in Cold Shutdown, Investigation Began to Determine Cause of Pavement Deflection Which Occurred Beneath Crane Outrigger Pad at Intake Structure.Cause of Fill Separation from Pipe Unknown

ML19318A651
Person / Time
Site:	Hatch
Issue date:	06/12/1980
From:	Manry M GEORGIA POWER CO.
To:
References
NUDOCS 8006230580
Download: ML19318A651 (2)

Text

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3 FONS Qhief dutrED STATES NUCLEAR REGUN_ O H N S'S ON SCES Chief utat.Clua or INSPECTION AND ENr0RCEMENT KEGt0N 11 TTMS Chif f  !

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SUEJECI: Hatch Unit 1 Docket No. 50-321 A . k.b5cn Reportable Occurrence No. 50-321/1980-062. Notification of UA!E: 0-12-80 NOTIFIED: Mr. Hugh Dance DATE: 6-12-80 TIME: 9 AM EDT DESCRIPr10H OF REPORTA8Lg OCCURREHCE Initial Condition With UntL 1 an cold shutdown an investigation was begun to determine cause of pavement defleeLion which occurred beneath o crane outrigger pad at intake s'tructure. This section of povement underground p i p i og . _ __ _

was over plant service water and RER service water '-

.,_ t poture of o c cu r r e n c e.

l excavation of the general area around the pavement deflection down revealed. to the two elevation problems

of the 1.

Unit 1 P5W underground pipins i separation of the f!!] from underneath the piping and 2. existence of a pipe support used  ;

during construcLlan which should have been removed.

Innediate Corrective Action An anvestigation begun. Research into into the cause for the soil separation was construction records was begun. to determine whether any more temporary supports existed on this.

line and other lines in this area. e cause the cause for the fill separatio.n from the pipe is n unknow'n at Lbis time.

egnetruction The of the temporary piping' system. pipe support was left from original

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V Supplemental Corrective Action A datanled plan for investigation into the conditions found in this area is beleg devotoped., Additionally ,. an evaluation is 5 w.

bolag pipingmade is belag of the made. effects of the. temporary pipe support on the ,3 ond corrected as required by acceptable construction practices.

The conditions found will be evaluated '

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Statur, both of Etdundant

_- . or Backup Systems divtstons of _PSW were . _ -operable. _

divisene of RHP. service water were operable. Ad d i tion a l ly, both ,

Jrpatt to other Unit hu investagataon I is underway on Unit 2 to determine l I the 'i' as-built ct the intake condit.structure.

ion of the underground piping (PSW and RHR3W)

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on has been found that would indicate this situation nimilar Unit 2 piping. Therefore,

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thcae ripingStartup a b u s ct ow n .

cystecs are not yet suspect. Unit 1 la in cold I  ; !

will be contingent on developing acceptable course of action to repair the present condition. an '

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LER 4: 50-321/1980-055 j Licensee Georgis Power Company Facility Name: Edwin I. Fatch i

Docket f: 50-321 t l

l Herrative Report for LER 50-321/1980-055  !

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A suuboer is to s11ow the pipe to move due to thermal expan-sion yet restrict audden' movement due 10 a seismic event. A locked up snubber would prevent thermal movement which could cause damaging stresses in the pipe. While inspecting the k.'

snuboers, Wo esses of the associated pipe damage piping were noted. .was also visually inspected. g.

This event Lorest to public health or safety. posed no L

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the cause toe snubbers. of thisAllevent of was thesefound to be internal corrosion of snubbers were manufactured by i

i International to replace Nuclear all Safeguards, Inc. Plans are being made j rammining INS mechaalcal snwbbers with a l attierent cn b o t tsmodel units. snubber during the upcoming refueling outages I

replaced before starLup ALL snubbers that were found of the respective unit. locked up were werc . replaced wiLh later modei IN5 snubbers, and Some some of these vere replaced with Pacific scientific anubbers. Three of the

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locked Luc prior. upapproval snubbers of the were A/E. replaced with rigid restrainta with I i

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