05000296/LER-1979-024-03, /03L-0:on 701208,following Return to Svc After Refueling,Excessive Local Leakage Detected at Southeast Drywell Equipment Hatch Door.Caused by Unevenly Tightened Bolts.Bolts Retightened

/03L-0:on 701208,following Return to Svc After Refueling,Excessive Local Leakage Detected at Southeast Drywell Equipment Hatch Door.Caused by Unevenly Tightened Bolts.Bolts Retightened

ML18024B227
Person / Time
Site:	Browns Ferry
Issue date:	01/07/1980
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024B226	List: 05000296/LER-1979-024, Forwards LER 79-024/03L-0 05000296/LER-1979-024-03, /03L-0:on 701208,following Return to Svc After Refueling,Excessive Local Leakage Detected at Southeast Drywell Equipment Hatch Door.Caused by Unevenly Tightened Bolts.Bolts Retightened
References
LER-79-024-03L-01, LER-79-24-3L-1, NUDOCS 8001100427
Download: ML18024B227 (4)

LER-1979-024, /03L-0:on 701208,following Return to Svc After Refueling,Excessive Local Leakage Detected at Southeast Drywell Equipment Hatch Door.Caused by Unevenly Tightened Bolts.Bolts Retightened

Event date:
Report date:
2961979024R03 - NRC Website

text

NRCPORM 366 I7 fr/ "r LICENSEE EVENT REPORT CONTROL BLOCK:

I IPLEASE PRINT OR TYPE ALLREQUIRED INFORMATION)

~01 7

8 CON'T

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LICENSEE CODE 14 15 LICENSE NUMBER 0

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7 9 OBLI/ LLl)J-~~ OB 60 61 DOCKET NUMBER 6&

69 EVENT DATE 74

. 75 REPORT DATE 80 EVENT DESCRIPTION ANO PROBABLE CONSEQUENCES QIO With unit 3 at 200 HWe followin unit return to service after refueling outage excess-

~0 3

ive local leakage was detected at the south east drywell equipment hatch door.

The

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plant was operated'nder conditions permitted by T.

S. 4.7.A.2.h.(2).

There was no 6

danger to health or safety of the public; no previous occurrences.

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80 SYSTEM

CAUSE

CAUSE COMP.

VALVE CODE CODE SU&CODE COMPONENT CODE SUBCODE SU&CODE

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SEQUENTIAL OCCURRENCE REPORT REVISION LEAFAO EVENT YEAR REPORT No.

CODE TYPE NO, Q17 RssssT

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~03

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0 21 22 23 24 26 27 28 29 30 ACTION FUTURE EFFECT SHUTDOWN ATTACHMENT NPRDQ PRIME COMP.

COMPONENT TAKEN ACTION ON PI ANT METHOD HOURS Q22 SUBMITTED FORM SUB.

SUPPLIER MANUFACTURER

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9 02 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVC ACTIONS Q27 o

East dr ell e i e

were reti htened and hatch assed LLRT.

Administrative controls are bein develo ed to incorporate additional verifications and to use a lock that will insure that the 3,

hatch is not disturbed without proper approval.

4 7

9 FACILITY STATUS sin POWER OTHER STATUS Q30 [iis] ~CQss ~02 0

Qss NA 7

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'IO 12 44 ACTIVITY CONTENT AELEASEO OF RELEASE AMOUNTOF ACTIVITYQ36 6

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10 11 44 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION Q30 [ll7] ~00 0

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11 12 13 PFRSONNEL INJURIES NUMBER DESCAIPTIONQ41

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10 PUBI.ICITY ISSUED DESCAIPTIONQ 0

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10 NABIE OF PREPARER 80 80 80 80 PHONE:

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~A Q31 Maintenance personnel observed 45 46 LOCATIONOF RELEASE Q NA 45

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Tennessee Valley Authority Bro~vns Ferry Nuclear Plant Fo(v'. BF-1'i BF 15.2

'/10/'l9 LER SUPPLEMENTAL INFOR&IATION BFRO-5G-

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7924 Technical Specification lnvolvec'.

T.S. 4.7.A,2.h.+2)

Reported Under Technical Specification 6.7.a.b~2 Dale nf Occurrence 12~879 Time of Occurrence 7:10~.u. linit.

3 Id<<ntification and De~seri tion'of Occurrence:

Excessive local leakage was detected at the east drywell equipment hatch door.

The plant was then operatdd under conditions permitted by T.S.

4. 7.A.2.h.(2).

Conditions Prior to Occurs ence:

Unit 1 8 970 MWe.

Unit 2 8 880 MVe.

Unit 3 9 200 MWe unit in test program following return to service after refueling outage.

A( tion speiifi(.d in the Technical Speeificatiori Siirveiilanc<< IIequirements tact (lue

'to 'nGQcra41'l c(lulPAl(,nt Dcs( i ioe.

Conformance to T.

S. 4.7.A.2.g was demonstrated within 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> following detection of the excessive local leakage as per T.

S. 4.7.A.2.h.(2).

e "4

~A!arent Cause of Occurrence:

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

Analvsis of Occurrence:

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 ll/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.

Correcti~. e Action:

Retightening of fasteners corrected leakage.

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

F(l tin rf! ()ata:

N/A

".R(at(:n'..on:

Po(iod

- Lifetime Rc.,ponsihility - Administrative Supervisor

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