ML19263C362

LER 79-005/03L-0 on 790119: During Normal Operation, Mass Spectometer Leak Detector Downscale Condition Annunciated & High Rad Alarm & Half Scram Occurred Twice on Same Day. Log Rad Monitor Replaced

ML19263C362
Person / Time
Site:	Dresden
Issue date:	02/09/1979
From:	Lindberg C COMMONWEALTH EDISON CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML17173A617	List: ML17173A616 ML19263C362
References
LER-79-005-03L, LER-79-5-3L, NUDOCS 7902220038
Download: ML19263C362 (1)

Text

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60 61. DOCK ET NUve ER fA 63 EVENT DATE l EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 During normal operation, D MSL downscale condition annunciated and shortly thereafter l

.} Upon resetting both alarms, operator l 1, l o 13 ] ] a D MSL liigh Rad alarm and half scram occurred.

t 4 l noted that both liigh Rad and the downscale lights were on. (T.S. Table 3.2.1 requires l

} o o s l MSL high rad setpt. be <[= 3 X background radiation level at rated pur.) Safety impli-l s

o g ] cations minimal because three remaining MSL Rad Monitors would have performed as re- [

o 7 [ quired. Previous event ref. under R.O. #50-249/1977-43. l o 8 l 80 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SU8 CODE CCMPON ENT CODE SUSCODE SUBCOOE loisi Ic ;D ; g ; c g A l g l Il Nl Sl Tl Rl U g l Xl g lZ l g 19 20 7 8 9 to 11 12 13 18 SEQUE N TI AL OCCURRENCE REPORT REVISION EVENT YE A R R EPORT NO. CODE TYPE N O.

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@ REeORT 7l 9l l_l l0 l0 l5 l j ,,-l l 0l 3 l lL l 30 l_l l0l 32 21 22 23 24 26 27 23 29 31 TAK N A T ON ON PLA T ET HOURS 22 S8 IT FO 1 8. S P LI E MAPUFA TURER l33G jglJ4Zl@ lZl@ l2l@ l0 l0 l0 l0 l 31 lNl@

41 l Y l@ l43 Nl@ lC 0l8l0l@ 47 35 36 40 42 44 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 1 o l Upon second occurrence of same event on 1/19/79 at 2000 hrs, D MSL Loc Rad Monitor re-li j i l [ placed with functional calibrated spare. MSL Loc Rad Monitor which was removed inter i 1 7 [ found to have open circuit. Monitor repaired and tested satisfactorily per DIS 700-1. l i 3 l

!l1 14I8 9 1 7 80 I

i ST U  % POV.ER OTHER STA TUS ISCO RY DISCOVERY 0ESCRIPTION f l l5l8 3 7

El@ l 100 l 8 812l@[ U-3 in shutdown44l11 lAl@l46 45 Operational Event 80 l

ACTIVITY CONTENT AMOUNT OF ACTIVITY 35 4

l RELEASED OF RELEASE LOCATION OF RELEASE I i 6 l Zl g l NA 44 l l' 45 NA g 80 l

7 8 9 10 11 PERSONNEL EXPOSURES f.UMB E R TYPE DESCRIPTION NA l I i I 7 I I 01 01 Ol@lz l@l 80 7 8 9 11 12 13 PERSONNEL INJURIES NUYRER DESCRIPTION NA l i li la l8 10 I 7 9 01 Ol@l 11 12 80

LOSS OF oR DAMAGE TO FACILITY 43 l TYPE DESCRIPTION

' NA l 121911 zi@l "

IS PUBL TY DESCRIPTIOP#

7902222 % NRC uSc OstY

• 12 l al [SUEDNJhl NA l ll llllllIlll,2 7 8 9 to 68 69 80.&

- Carl Lindberg X-289 o i NAME OF PREPARER PHONE: $