05000296/LER-1979-022-03, /03L-0:on 791208,following Return to Svc After refueling,drywell-to-suppression Chamber Differential Pressure Could Not Be Maintained Per Tech Spec.Caused by Leak at Hatch Door Due to Loosened Bolts

/03L-0:on 791208,following Return to Svc After refueling,drywell-to-suppression Chamber Differential Pressure Could Not Be Maintained Per Tech Spec.Caused by Leak at Hatch Door Due to Loosened Bolts

ML18024B224
Person / Time
Site:	Browns Ferry
Issue date:	01/04/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024B223	List: 05000296/LER-1979-022, Forwards LER 79-022/03L-0 05000296/LER-1979-022-03, /03L-0:on 791208,following Return to Svc After refueling,drywell-to-suppression Chamber Differential Pressure Could Not Be Maintained Per Tech Spec.Caused by Leak at Hatch Door Due to Loosened Bolts
References
LER-79-022-03L-02, LER-79-22-3L-2, NUDOCS 8001090422
Download: ML18024B224 (4)

LER-1979-022, /03L-0:on 791208,following Return to Svc After refueling,drywell-to-suppression Chamber Differential Pressure Could Not Be Maintained Per Tech Spec.Caused by Leak at Hatch Door Due to Loosened Bolts

Event date:
Report date:
2961979022R03 - NRC Website

text

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60 61 DOCKET NUMBER 68 69 EVENT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES QIO With unit 3 at 200 MWe following unit return to servi ce after

~03 refueling outage, the drywe 11 to suppression chamber diffe rent ial pressure could not be maintained at or above 1.3 psid per technical specification 3.7.A.6.a.

An orderly shutdown of unit 3 was initiated.

There was no danger to the health or ssf et of the ub 1ic no previous simi1ar occurrences.

Redundancy is not app 1icable

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ast dr ell e ui ment hatch i htened bolts.

Bolts were reti dministrative controls are bein develo ed t 3

dditional verifications and the use of a k

atch is not moved without ro er a ro 7

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r/10/'('4 LER SUPPLENENTAL INFORi~lATION HFPO 296 /

7922 Techrric;rl Specificat.ion Involvcii 3 ~ 7'

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Repvrted Under 'I'cchnical Spcciricatinn 6 ~ 7 2 b. <2>

Date of Occur'rene(:

12/8/79 Time of Orcurr.ence 1235 Urrit Id>>>>tiiication and Dose: iption 'of Occrr r r'errce:

Drywell to suppression chamber differential pressure could not be maintained at or above 1.3 psid per technical specification 3.7.A.6.a.

Cond'Ion.'> Pl'ror ro Occur'rc neo'.

Unit 1 8 970 MWe Unit 2 6 880 MWe Unit 3 8 200 MWe Unit in test program following return to service after refueling outage.

Action specified in the Technical Specification Surveillanc" R<<quir ements:;.ret due to inoperable e~u~iment.

Descrihe.

Differential pressure between drywell and suppression chamber must be established within 24 hrs of achieving operating temperature and pressure.

~A apparent Cause of Occurrence:

Leak around east equipment hatch seal due to unevenly tightened bolts.

Anal;.,is of Occurr <:nc>>:

h There was no danger to health or safety of the public, no activity release, no damage to plant equipment.

East equipment hatch was installed and initially failed a local leak rate test on 11/14/79.

The hatch was retorqued and passed the local leak rate test on ll/14/79.

An integrated leak rate test was conducted between 11/21/79 and ll/26/79 and no leakage was detected on the hatch.

No other.work was performed on the hatch until the subject occurrence on 12/8/79.

Cor'rcctr ve Act(OI1:

Retightening of fasteners corrected leakage.

Developing administrative controls including detailed instructions and procedures which incorporate appropriate signoffs and a lock that will insure that the hatch is not moved without proper approval.

Farlur(. Data:

NA

~:lt:".t'"ntion:

Period

- Lifetime; Bespo>>siL'ility - Administrative Superv.'"or.

"Revisron:

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