05000260/LER-1979-014-03, /03L-1 on 790526:while in Cold Shutdown for Refueling,Local Leak Rate Testing Revealed That Total Leak Rate Exceeded Allowable 60%.Caused by Deterioration of Valve Seats on Main Steam Sys.Valves Repaired

/03L-1 on 790526:while in Cold Shutdown for Refueling,Local Leak Rate Testing Revealed That Total Leak Rate Exceeded Allowable 60%.Caused by Deterioration of Valve Seats on Main Steam Sys.Valves Repaired

ML18024A927
Person / Time
Site:	Browns Ferry
Issue date:	07/30/1979
From:	TENNESSEE VALLEY AUTHORITY
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML18024A926	List: 05000260/LER-1979-014, Forwards LER 79-014/03L-1 05000260/LER-1979-014-03, /03L-1 on 790526:while in Cold Shutdown for Refueling,Local Leak Rate Testing Revealed That Total Leak Rate Exceeded Allowable 60%.Caused by Deterioration of Valve Seats on Main Steam Sys.Valves Repaired
References
LER-79-014-03L, LER-79-14-3L, NUDOCS 7908020502
Download: ML18024A927 (2)

LER-1979-014, /03L-1 on 790526:while in Cold Shutdown for Refueling,Local Leak Rate Testing Revealed That Total Leak Rate Exceeded Allowable 60%.Caused by Deterioration of Valve Seats on Main Steam Sys.Valves Repaired

Event date:
Report date:
2601979014R03 - NRC Website

text

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LEAR REGULATORY COMMISSION QsA X

X X Q4~00 25 26 LICENSE TYPE 30 57 CAT 58

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, UPDATE REPORT PREVILA REPORT DATE 6/26/79 I7 77)

LlCENSEE EVENT REPORT CONTROL BLOCK:

IPLEASE PRINT OR TYPE ALLREQUIRED INFORIVIATIONI~

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9 LICENSEE CODE 14 15 LICENSE NUMBER CON'T

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8 60 61 DOCKET NUMBER 68 09 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES QIO

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While in cold shutdown for refuelin local leak rate testing was performed in accor-dance to technical specification 4'.A.2.g.

The total leak rate of 5026.5225 SCFH

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exceeded the allowable 60 ercent of LA per 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of 707.1 SCFH.

There were no significant resulting events nor any danger to health or safety of the public.

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previous similiar occurrence was reported on BFR0-50-259-793.

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CAUSE

CAUSE COMP.

VALVE CODE CODE SUBCODE COMPONENT CODE SUBCODE SUBCODE

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10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LERIRO EVENT YEAR REPORT NO.

CODE TYPE NO.

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<B LJ L~J 21 22 23 24 26 27 28 29 30 31 ACTION FUTURE EFF ECT SHUTDOWN ATTACHMENT NPRD 4 PRIME COMP, COMPONENT TAKEN ACTION ON PLANT hIETHOD HOURS Q22 SUBMITTED FORM SUB.

SUPPLIER MANUFACTURER

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9 Q20 33 34 35 36 37 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS Q27 The excessive total leakage was caused b

deterioration of valve seats on the follow-ing systems:

Hain Steam, Ventilation and Contaiiunent Dilution Feedwat Valve nameplate data is being furnished on a su lement to this re ort.

The valves 80 7

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FACILITY STATUS

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10 12 ACTIVITY CONTENT RELEASEO OF RELEASE EKI &Q Q34 7

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10 PERSONNEL EXPOSURES NUI'NBER TYPE DESCRIPTION Q30

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11 12 13 PERSONNEL INJURIES 7

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11 12 LOSS OF OR DAAIAGETo FACILITYQ43 TYPE

DESCRIPTION

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9 10 PUBLICITY 7

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10 OTHER STATUS Q NA METHOD OF DISCOVERY OISCOVEI'IY DESCRIPTION Q32

~B QqI Surveillance Testing 45 46 I '1 44 AMOUNTOF ACTIVITYQs NA LOCATIONOF RELEASE Q 80 80 44 45 80 80 80 NRC USE ONLY 80 0

68 69 were repaired and retested to demonstrate compliance.

4 NAME OF PREPARER PHONE:

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