ML17338B327

LER 79-021/03L-0:on 790821,during Normal Operation,Offgas Monitor 3A Took Step Increase W/No Power Change & hi-hi Trip Light Was On.Caused by Faulty V1 Electrometer Tube,Which Was Replaced.Monitors Will Be Tested Monthly

ML17338B327
Person / Time
Site:	Dresden
Issue date:	09/20/1979
From:	Lindberg C COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17174A030	List: ML17338B327
References
LER-79-021-03L-03, LER-79-21-3L-3, NUDOCS 7909280425
Download: ML17338B327 (2)

Text

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'CENSEE EVENT REPORT

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,0 tPI.EASE PRINT OR TYPE ALI. REQUIRED INFORMATION) 9 I L D R LICENSEE CODE S 3Q200-00000 14 15 LICENSE NUMBER 25 0>

26 LICENSE TYPE 30 P~ Q 57 CAT 58 apso 5 0 0 0 DOCKET NUMBER 2 4 9 68 QTO G9 8 2 l EVENT DATE 7 9 74 Qso 75 9 2 REPORT DATE 80 0

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES @10

~or During normal operation, the 'A'fPgas monitor was found to taken ate ~

increa~se with no power change. Tbe operator also noti.ced the Hi Hi trip light on. No chan e was observed 'in tbe '38'ff-gas monitor. Safety significance minimal because re-dundant 'B'onitor continued I:o operate normally. Last avant of this type was re-ported by Ro f79 107-03L 0, -Docket f/050 249.-

~Os 7 8 9 80 SYSTEM CAUSE CAUSE v COMP, VALVE CODE CODE SUOCOOE COMPONEINT CODE SUOCODE

~Os 7 8

~NB 9 10 Q11 ~H 11 QIE ~A 12 Q13 13 l N S 2 R U 18 Q14 ~H 19 QTS SUBCODE

~Z 20 Qe SEQUENTIAL OCCURRENCE REPORT RF.VISION Qlr LERgRO REPORT ACTION FUTURE EVENT YCAR

~79 21 22 EFFECT

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23 SHUTDOWN

~02 24 REPORT No.

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27

'~03 28 ATTACIIMENT CODE 29 NPRDR

~L TYPE 30 PRlhlE COMP.

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31 No.

~0 32 COMPONENT TAKEN ACTION ON PLANT hlETHOD HOURS Q22 SUBh'IITTED FORM SUB. SUPPLIER MANUFACTURER 33 Qls Lnas 34

~zp 35

~zpr 36 37 0 0' 0 40

~NQEE 41

~YQER 42

~NQEE 43 44 0 0 8 0 47 Qre CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 o Cause attributable to a fault pl electrometer tube in the in ut Ri n 7 of the lo rad monitor. The tube Vl was re laced. Ln addition, as a precautionary measure similar tubes V2 6 V3 were replaced. Off-gas rad monitors will continue to 3 be calibrated and funct nally tested monthly as per DCP 2700-11.

4 7 8 9 80 FACILITY METHOD OF STATUS  % POWER OTHER STATUS DISCOVERY ~ DISCOVERY DESCRIPTION 32

~07 Operational Event 7

E 8 9 8 Qrs 10 7

12 Q 13 NA 44

~AQRT 45 46 80

~Is ACTIVITY

~Z Q33 CONTENT REI.EASED Or- RELEASE

~ZQ34 AMOUNTOF ACTIVITY NA p NA LOCATION OF RELEASE

'7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION

~OO O PET 7 8 9 11 I2 13 80 PERSONNEL INJURIES NUMBER DESCRIPTION 41

~oo o Qo NA 7 . 8 9 11 12 80 LOSS OF OR DAhlAGE To FACILITY TYPE DESCRIPTION s ~zp>>E NA 7 8 9 10 80 PUBLICITY NRC USE ONI Y ISSUEO DESCRIPTION ~<> 7909280 QP a el

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8 9 lo GB 69 80 ~ o Carl Lindberg X-289 0 L

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.NAME OF PREPARfR PHONE: 43

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