ML19351F524

LER 80-104/03L-0:on 801204,F-476 Feed Flow Protection Channel for 1A Steam Generator Failed Surveillance Test. Caused by Bad Clock Board Allowing Loop Voltage Drift on Steam Flow Input.Clock Pulse Adjusted

ML19351F524
Person / Time
Site:	Beaver Valley
Issue date:	01/05/1981
From:	Lacey W DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19351F522	List: ML19351F521 ML19351F524 ML19351F526 ML19351F529 ML19351F532 ML19351F535
References
LER-80-104-03L, LER-80-104-3L, NUDOCS 8101130425
Download: ML19351F524 (2)

Text

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u l L @l 0 i 510 l 01013 l 3 l a @l 64 60 1DATE (VENT l 210 l 4 l a lREPORTDATE 1 7% 0 )@l Of 80Il 01 SI 8l 1l 7 4 e0 el DOCKETNuwegm EVENT DESCMIPTION ANO PROSASLE CONSEQUENCES h g I o 12 J l At 0315 hours0.00365 days <br />0.0875 hours <br />5.208333e-4 weeks <br />1.198575e-4 months <br /> with the reactor at 40 percent power, the F-476 feed flow protection gTT} l channel for the 1A Steam Generator f ailed its surveillance test. The flow mismatch l l

l o 141 l trip point from FC-FW-478A to the low feed flow-low level steam generator reactor ITTT) I trip was found less conservative than the allowable limiC of Technical Specification l l o i s I l 3. 3.1.1. The health and safety of the public was not ieopardized since another feed l 10171 I flow channel remained in service for the 1/2 locie inout to the reactor trip signal.)

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CAuSE DESCRIPTION AND CORRECT 1VE ACTIONS h l

g i The incident resulted from a bad clock board which allowed the loop voltage to After adjusting the l m 1 drift on the steam flow input to flow comparator FC-FW-478A.

1 m Letock pulse, the protection channel was returned to service at 1600 hours0.0185 days <br />0.444 hours <br />0.00265 weeks <br />6.088e-4 months <br /> on l

g i 12/4 /80. This type of incident has occurred one other time at BVPS.

l LLL*J l so 7 a 9 OTNERSTATUS DISCO Y DISCOVERY DESCRIPTION ST

% POWER N/A [Bj@l Surveillance test l IT'ITl[JJ@

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80 N/A i i i i i iiiiiiiii; 2 o issutis iN ($CmiPTION 60 69 80 5 F 4 7 to W. S. Lacey PHONE:

NAME OF PREPAREF:

r' 1 e : i 30'/.25

3 Attachment To LER 80-10'4/03L Beaver Valley Power Station Duquesne Light Company Docket No. 50-334 No further information is available or needed to satisfy the reporting requirement.

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