ML19305B353

LER 80-007/03L-0:on 800209,during Local Leak Rate Test of Containment Vent Line,Measured Leakage Exceeded Tech Specs. Investigation Showed Valve AO-3-1601-23 Leaking Through. Caused by Normal Expected Wear of Rubber Seats

ML19305B353
Person / Time
Site:	Dresden
Issue date:	03/12/1980
From:	Dunbar J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17192A582	List: ML17192A581 ML19305B353
References
LER-80-007-03L-01, NUDOCS 8003190569
Download: ML19305B353 (2)

Text

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& 60 61 OG;K ET %,VSta 64 tE9 EVENT O ATE :4 AE'CRT C ATE EVENT CESORIPTION ArjD PACS ARE CONSEOUENCES h oi:I l During local leak ra:e test of the containment vent line, the ceasured leakage was  ;

c,3, l1,990 SCFH which is in excess of the Tech Spec. lini: for a single centaineant isolatio:}

3,4; l valve (29.38 SCFH). Upon investigation A0-3-1601-23 was found leaking through. No l oi3j l leaka;;e was detec:ed at the other boundary valves. This event was of minimal safety l aie1 significance because all leakage was con:ained in the vent line and was into the dry- l 3;;; lwell. Similar even:s: 50-237/76-10, 79 ')l7 & 30-249/76-16. l l

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ACTION FUTURE EFFECT SwuT30WN ATT Ackv f NT N ' a O.4 **V E COvs. Cov'CNENT YMEN ACTION ON PLANT YETHOD wobF5 $U5m TTED 80RY >US SUPPLt En V AP.UF ACTURE A lCjg[3, Zjg 2._

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u. 4, CAUSE CESORIPTION AND CORRECTIVE ACTIONS h i iol] A0-3-1601-23 was replaced and the vent line rategra . The leakage was 3.71 SCFH. Ao- l 3 g3] l 3-1601-23 is a 18" rubber seated butterfly valve. model No. 2FII. Leakace was due to I

. 47; l normal expected wear of the rubber seats. No further cerreceiv. action is deened .y

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John Dunbar ,

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sp DEVIATION REPORT

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Commonwealth t6 son .

STA UNG YEAR N O. -

D 3- 80- 10 PART jj T TwE G~ OE'lATION CCCJ U.E D Cu :ainment vent line er.cessive leakage 2/9/80 1A40 n...

SYSTEM AFFEC E0 PL/ NT CON 0lilON5 T! STING 600 g i i Primary Centainment 9739 pf..y1 3 ,,;, , y, _3 0 te23 fywg3 0 YES NO cisCRiFitON CF iviM During local leak rate testing of containment vent line, the ecsured leak was 1990 SCFH.

Leakase is susoected to be through the AO-3-1601-23 valve.

DESCRIPTION CF CAUSE Unknown DTie AP:LICABLE IN ORMATICN All leakare is ^^ntained in the sent line.

EOUIPMENT C YE5 DR NO. WR NO.

FAILU RE O N^* N/A NO2 '/9/80 RESPONil!LE SUF W:50R CATE PART 2 l OPE:AT!NG ENGINEERS COMMENTS Following replacement of the 3-1601-23 valve, an acceptable LLRT was obtained on 3-4-50: thus containment thru leakace was within the limits of the Tech. Specs. Tech . Spec. 4. 7. A. 2. g was exceeded for leakace throuch a sin 21e isol valve.

SAFETY-TYPE OF CEVIATION EVENT OF POTENTIAL TECH S EC NON-REPCRTABLE ANNU A!. RELATED RE:ORTABLE CCCURRENCE PUBLIC INTEREST VIOLATION OCCURRENCE R EPOP.T I NG AR ISSUED

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• ' NOTIF1CATICN 6.6.3.2.d REPORTABLE CCCURRENCE ACTION ITEM NO. PROM?T ON-SITE NOTIFICATICN NUV~: =' R R. M. Ragan 3/3/S0 0920 y@ 80-?/03L-0 I' EE CAIE *E TITLE CATE TIME 24-HOUR NRC NOTIFICATION PROMPT OFF-SITE NOTIFICATION Verbal 1 By m. Toncue 3-5-80 0900 F. Palmer 3/5/S0 11:30 AM

_ PEGION iii CATE TIME TITLE DA'E Tiv 7ay J. Gilliom 3/5/80 11:35 Ax REGION lli a COL DATE T'ME TITLE OATE TivE RESPONSI SLE COYF ANY OFF! CE: INFyFVED OF 10CFR21 caN D : TicNs AND ta i o :::O=? ?.- Noc

• TITLE DATi iW REviEA AND COMPLETED-Michael Wright 3/5/80 M ERATING ENGiNEis GATE ACCEPTANCE BY STATION REVIEW #!

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