05000237/LER-1981-037-03, /03L-0:on 810607 During Normal Operation,Vacuum Breaker 2-1632-D Position Indication Was Lost During Testing.Cause Unknown.Breaker Retested W/O Problem

/03L-0:on 810607 During Normal Operation,Vacuum Breaker 2-1632-D Position Indication Was Lost During Testing.Cause Unknown.Breaker Retested W/O Problem

ML20009A868
Person / Time
Site:	Dresden
Issue date:	07/02/1981
From:	Holland P COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20009A865	List: 05000237/LER-1981-037, Forwards LER 81-037/03L-0 05000237/LER-1981-037-03, /03L-0:on 810607 During Normal Operation,Vacuum Breaker 2-1632-D Position Indication Was Lost During Testing.Cause Unknown.Breaker Retested W/O Problem
References
LER-81-037-03L, LER-81-37-3L, NUDOCS 8107140381
Download: ML20009A868 (2)

LER-1981-037, /03L-0:on 810607 During Normal Operation,Vacuum Breaker 2-1632-D Position Indication Was Lost During Testing.Cause Unknown.Breaker Retested W/O Problem

Event date:
Report date:
2371981037R03 - NRC Website

text

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NRC FEM 366

- - - - - U.S. NUCLEAR REGULATORY COMMISSION (7-77)

L.lCENSEE EVENT REPORT

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CONTROL BLOCK: l l

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8 60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT CATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h I o i 21 l Durine normal Soeration with Suopression Chamber to Drvwell Vacuum Breaker I

l o 131 l Operability Test DOS 1600-9 in progress, vacuum breaker 2-1632-D position indication - l

. lo1Al l was lost. The vacuum breaker was immediately verified to be closed. This was of

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l o I s i I minimal safety significance since only the indication was lost and the vacuum breaker l.

Io (s l l operated properly. There was no effect on public health or safety.

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7 8 9 80 OE CE SL C E COMPONENT CODE SU8 Code S

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10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION LE R/ R0 EVENT YEAR REPORT No.

COCE TYPE No.

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 l1 Io l l The vacuum breaker was retested several times and the problem did not reoccur.

l litil l Therefore, the exact cause could not be determined. DOS 1600-9 will continue to be I

i, i 2 I l performed monthly to verify vacuum breaker operability.

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j 11 141 l l

7 8 9 80

% PCWER OTHE R STATUS dis O Y

DISCOVERY CESCRIPTION l115 l l E l@ l 0l 4l 5l@l NA l

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10 12 11 44 46 46 80 CELEASED CP RELEASE AMOUNT OF ACTIVITY LOCATION CF RELEASE R l Zl @ d@l NA l

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l' PERSeNNEL iN2u' RIES 2

DESCRIPTION @

NUM8ER p li la l l 0l G ld@l NA l

l 7 8 9 11 12 80 LCSS OP c4 0*vAGE TO FACluTY TYPE KESC G.'ON l 1 l 9 l l Zl@L NA l._

l 7 8 9 10 80 Pu8uc:TY fm e107140381 810702 NRC USE ONLY 12 l o l* l N lhlcEScRiPrioN U IS$uEe PDR ADOCK 05000237 S

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DEVIATION REPORT z7 DV R NO.

Commonwealth Edison STA UNIT YEAR N O.

e 2 - 81 61 PART 11 TI TLE OF CEVI ATION CCCU RRED 6-7-81 13:45 Loss of One Vacuum Breaker Indication DATE TIMt SY5 TEM AFFECTED 1600

PLANT CONDITIONS

TESTING Primary Containment W

MODE Run p w n,9wr3 1143

, LOAD (MWE) 318 YES NO

DESCRIPTION OF EVENT

During Suppression Chamber to Drywell Vacuum Breaker Opera'ility Test, DOS 1600-9, o

vacuum breaker 2-1632-D right limit switch failed to cause Alarm 902-4-G-14 or cause the 1 :al light to go out.

DESCRIPTION OF CAUSE Bad switch.

DTH'ER APPLICABLE INFORMATICN

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Left side switch works.

EQUIPMENT X YES CR NO.

WR NO.

FAILU RE O NO D14091 955?ONSIBLE SUPEevlSOR DATE PART 2 l OPERATING ENGINEERS CCYMENTS Drvwell vacuum breaker was physically verified to be closed immediately.

SAFETY-TYPE OF CEVIATION EVENT OF POTENTIAL TECH SPEC NON-REPORTABLE ANNUAL RELATED REPORTABLE 0] URRENCE PUBLIC INTEREST VIOLATION OCCURRENCE REPORTING AR ISSUED 10CFR21 YES X YES X 14 CAY lXl30 CAY I Fl 1CN NO NO y

REPORTABLE CCCURRENCE ACTION ITEM NO.

PROMPT ON-SITE NOTIFICATION D. J.

Scott 6-8-81 08 00 TITLE CATE TIME TITLE CATE TIME 24-HOUR NRC NOTIFICATION PRCMPT C ?-SITE NOTIFICATION TPH Mike Jordan 6-8-81 09.D0 F. A. 5almer 6-8-81 12:50 PEGION lli CATE TIME TITLE DATE TIME TGM

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REGION lli 4 COL CATE TIME TITLE CATE TlVE RESPONSI ELE COvP ANY f F I P.ER INFOPYED OF IOCFR21 CON 0!TiONS AND TWEIR DEPO RT TO N PC TITLE DATE TiVt R EVI EW AND CGMPLETED J. W. Wuiciga 6-8-81 CPERATING ENGINEtR DATE

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