05000334/LER-1979-042-03, /03L-0:on 791013,RCS Loop a Feedwater Flow Channel 3 Indication Observed Spiking Downscale.Caused by Loose Printed Circuit Card in Instrument Loop.Card Strapped to Position & Loop Returned to Svc

/03L-0:on 791013,RCS Loop a Feedwater Flow Channel 3 Indication Observed Spiking Downscale.Caused by Loose Printed Circuit Card in Instrument Loop.Card Strapped to Position & Loop Returned to Svc

ML19210D021
Person / Time
Site:	Beaver Valley
Issue date:	11/13/1979
From:	Werling J DUQUESNE LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19210D017	List: 05000334/LER-1979-042, Forwards LER 79-042/03L-0 05000334/LER-1979-042-03, /03L-0:on 791013,RCS Loop a Feedwater Flow Channel 3 Indication Observed Spiking Downscale.Caused by Loose Printed Circuit Card in Instrument Loop.Card Strapped to Position & Loop Returned to Svc
References
LER-79-042-03L, LER-79-42-3L, NUDOCS 7911200425
Download: ML19210D021 (1)

LER-1979-042, /03L-0:on 791013,RCS Loop a Feedwater Flow Channel 3 Indication Observed Spiking Downscale.Caused by Loose Printed Circuit Card in Instrument Loop.Card Strapped to Position & Loop Returned to Svc

Event date:
Report date:
3341979042R03 - NRC Website

text

NRC Fo 36E O U.S. NUCLEAR REGULATORY COMMISSION (7 771 Ow c

BENSEE EVENT REPORT CONTROL BLOCK: l l

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lh, (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6

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8 60 61 DOCKET NUM8ER 68 69 EVENT OATE 74 75 REPORT DATE 80 EVENT OESCRIPTION AND PROBABLE CONSEQUENCES h o

2 l At 1130 hours0.0131 days <br />0.314 hours <br />0.00187 weeks <br />4.29965e-4 months <br />, RCS Loop A Feedwater Flow Channel 3 indication was observed I

o 3 l periodically spiking downscale. At 1206 hours0.014 days <br />0.335 hours <br />0.00199 weeks <br />4.58883e-4 months <br />, the channel was declared inoperable I l and the channel bistables were placed in the tripped position. The health and I

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o s l safety of the general public was not jeopardized as the redundant instrument 1

0 6 l channel was operable throughout the incident.

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CODE S SC E COMPONENT CODE SUSCbOE SU E

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33 34 35 36 37 du 44 42 43 44 47 CAUSE DESCRIPTION AND CC3RECTIVE ACTIONS h i

o l The incident resulted from a loose printed circuit cavi in the instrument loop.

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g l The card was strapped to hold it in position and the loon was satisfactorily I

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