ML20041B257

LER 82-004/03L-0:on 820117,during Local Leak Rate Testing of Containment Ventline,Measured Leakage Was 5612 Scfh Exceeding Tech Specs.Caused by Deterioration of Seating Surface.Valve Replaced

ML20041B257
Person / Time
Site:	Dresden
Issue date:	02/09/1982
From:	Cristel B COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20041B248	List: ML20041B247 ML20041B257
References
LER-82-004-03L, LER-82-4-3L, NUDOCS 8202230437
Download: ML20041B257 (2)

Text

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LICENSEE EVENT REPORT CONTaOL sLOCx: l l l l l <Pt.EAsa PalNT 02 TYPE ALL REQUIRED INPOIMATIONI l o l a1 el 'l* IlucENsEE 7 L l D lcocE R l S i4l 3 l@l 0 l 0 l - l ucENsE ts 0 l 0 NuMsEn l 0 l 0 l 0 l- l 0 l2s0 l@l 2a 4ucENst l1 l1Tv,El1 l120 l@ls7 lCAT l sa @

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60 61 coCX ET NuMO ER 68 69 EVENT CATE 74 75 PEPORT QATE 80 EVENT DESCRIPTION AND PROSA8LE CONSEQUENCES h Iof2l l During local leak rate testing of containment vent line, the measured leakage was 5612 l g ; SCFH vhich exceeds Tech. Spec. 4.7.A for single isolation (29.38 SCFH). Investigation l .

, ,,, , showed leakage through A0-3-1601-23. No leakage was detected through any other valve. l The safety significance was minimal since all leakage was contained in the vent line. g The health and safety of the public was not affected. Previous occurrence reported for g Unit 2 by R.O. 50-237/81-05.

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i ;,jo; l Leakage through the valve was due to deterioration of the seating surface. The valve I q ,,,,,g will be replaced. Following replacement of the A.O. 3-1601-23 valve, the volume will I g

be retested. If any other valve leaks above Tech. Spec. limits, it will be repaired and l reported at that time.

Engineering reviewing the subject valve for possible redesign or ;

modification.

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DEVIATION REPORT

• Commonwealth Edison DVR NO. -

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STA UNIT YEAR NO.

P ART I l TITLE OF DEVI ATION OCCURRED i

Excess Leakage of Valve A.O. 3-1601-23 1-17-82 0800 SYSTEM AF7ECTED 1600 PLANT STATUS AT TIME OF EVENT TESTING Containment' System uODE Shutdom p RcM,T3 0 . LOAD (MAEl 0 y O

ctSCRIPTION OF EVENT While performing the local leak rate test on the drywell to torus-t vant, it was determined that the A.O. 3-1601-23 valve leaked excessively (5612 SCFH). The -

l Tech. Spec. limit for this valve is 29.38 SCFH.

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4 10 CFRSO.72 NRC RED PHONE O E l NOTIFICATION MADE YES NO

! EQUIPMENT FAILURE 18176 OVES ONO *ORK REcuEST NO. REsPONSietE suPERv SOR Ed Rowley oAre 1-17-82 _

P ART 2 l OPERATING ENGINEER'S COWENTS Following repair of the 3-1601-23 valve, the volume will be

retested. If any other valve leakage over Tech. Spec. limits is detected, it will be l

reported at the time of 'the retest.

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O EVENT OF PUBLIC INTEREST O 24* HOUR NRC NOTIFICATION REO'D i O TECH. SPEC. VIOLATION TELEPH T. Tongue (courtesy) 1-18-82 940 l REGION lil DATE TIME 1 O NON REPORTABLE OCCURRrNCE TELEGM/TELECOPY O 'A DAv aEPOaTAsLE/T.S. aEGiON iii DATE Ti ME G 30 DAY REPORTABLE /T.Sh

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