05000249/LER-1980-007-03, /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

/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: 05000249/LER-1980-007, Forwards LER 80-007/03L-0 05000249/LER-1980-007-03, /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
References
LER-80-007-03L-01, NUDOCS 8003190569
Download: ML19305B353 (2)

LER-1980-007, /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

Event date:
Report date:
2491980007R03 - NRC Website

text

RC FOnM 336

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U. S. Nu'CLE AR REGOI. ATbRY COM%tlSSION 7 771 LICENSEE EVENT REPORT c NTRO. stC.Co 1 I

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4 76 AE'CRT C ATE SC 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.

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CAUSE CESORIPTION AND CORRECTIVE ACTIONS h iol] A0-3-1601-23 was replaced and the vent line rategra.

The leakage was 3.71 SCFH.

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g3] l 3-1601-23 is a 18" rubber seated butterfly valve. model No. 2FII. Leakace was due to I 3

. 47; l normal expected wear of the rubber seats.

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sp DEVIATION REPORT My ovR No.

Commonwealth t6 son STA UNG YEAR N O.

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

SYSTEM AFFEC E0 PL/ NT CON 0lilON5 T! STING 600 g i i

Primary Centainment 9739 pf..y1 3,,;,, y, _3 0

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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 10CFR2

4 ngy YES X YES X i

Xl-30"AY NOTIF1CATICN l

NO NC 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 m. Toncue 3-5-80 0900 F. Palmer 3/5/S0 11:30 AM 1

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?.- Noc TITLE DATi iW Michael Wright 3/5/80 REviEA AND COMPLETED-M ERATING ENGiNEis GATE ACCEPTANCE BY STATION REVIEW D' /M W d 0[4 W ['

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