ML19270H029

LER 79-010/03L-0 on 790514:2A Fuel Pool Radiation Monitor Failed Upscale & Failed Again on 790601 & 02.Caused by Failure of GM-tube in Sensor Conventor Unit.Tube Finally Replaced W/Amperex 18529

ML19270H029
Person / Time
Site:	Quad Cities
Issue date:	06/12/1979
From:	Vahrenwald J COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19270H026	List: ML19270H025 ML19270H029
References
LER-79-010-03L-03, LER-79-10-3L-3, NUDOCS 7906220386
Download: ML19270H029 (1)

Text

NRC FORM 366 U.S. NUCLE AR REGULATORY CCMMISSION (7 77)

LICENSEE EVENT REPORT .

dONTROL BLOCK: l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATIONI

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R(PCHT Q ATE I 8 60 61 COCK ET Nysag E R od 69 EVENT QATE EVENT DESCRIPTION AND PRCBABLE CCNSECUENCES h ITTTI I On May 14, 1979, the 2A 'uel pool radiation monitor failed uostale. The certor build- }

o a 1 ing ventilation system isolated and the standby oas treatment systen started as desianed.l 10141 The 2A monitor was repaired and returned to service the same dav. On June 1, 1979, the l la ls t 1 2A monitor failed upscale a second time and was repaired and returned to service. On l o s  !

June 2, a failure of the 2A monitor reoccurred and additional repairs were made. The l o 7 l 28 monitor was operable at all times and the require. Tents of TS 3.2.F.2 were met. l o a l I 7 8 9 80 SYSTE M CAL 2 CAUSE COMP. VALst CODE CODE SUaCCCE CCMPCNENT CCDE SUSCODE SU8CCOE o 9 l Bl A @ W@ l Elh  ! l N l S lT lR l0 l@ LLj@ l Z l @

7 8 9 10 11 12 18 IJ .0

_ SEQU ENTI AL CCCURRENCE REPCRT R EVISION LER EVENT YE AR REPORT NO. CCC6 TYPE NO.

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40 42 43 44 CAUSE DESCRIPTION AND CCRR2CTIVE ACTIONS h g l On May 14 the GM-tube in the sensor converter unit failed. causinn the 2A r-oni ur I i i l t'o read uoscale. The GM-tube was renlaced with a GE 167A2Gch rn02 raniace,ent. s On i

, 7 ] June 1, when the monitor drifted uoscale a second time. the senser converter was I i 3 l recalibrated. The monitor cerformed pronerlv until June 2 when it driftad out of l i 4 l calibration and the GM-tube was reolaced with an Amoerex 18529. I 7 8 9 ao ST  % PCwER OTHER STATUS Ots C RY OtSCOVERY CESCRiPTICN Operational Event fi Ts'l l E l@ l 0l 9 l 1 l@l NA l lAl@l l AbivlTY CCN TE NT RELE ASED OF RELE ASE AMOUNT 0F ACTIvtTY LOCATICN CF RELEASE -

7 1 6 8 9

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tt NA 44 l

45 NA 80 l

PERSONNEL EXPCSURE$

NUMBER TYPE DESCRIPTtCN NA Ql0 l 0 l 0 l@l Z l@l' l

PERsCNNEtIN iES NUMBER CESCRIPTICN l1laj 0]Ol0l@) NA 2 7 d / .g)Q 3

1 4 9 1I 17 80 LOSS OF Cn DavaGE To FACILITY TYPE D E SC R t P TIC N 7

1 9 8 9 lZl@l to NA 40 l

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issy DE SCRIPTION 7 000220M6 .

ITITl8 LfdE81 NA I IIIIIIIIIIIIIi 7 9 to 68 69 40 + e

\.we ne ,oce anso -~J. Vahrenwald PHONE: G E-22h1 6t. 15 I,