ML19210D021

LER 79-042/03L-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

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: ML19210D016 ML19210D021
References
LER-79-042-03L, LER-79-42-3L, NUDOCS 7911200425
Download: ML19210D021 (1)

Text

NRC Fo 36E O . U.S. NUCLEAR REGULATORY COMMISSION (7 771 Ow c .. BENSEE EVENT REPORT CONTROL BLOCK: l l l l l l lh, (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) 1 6 7

o 1 8 9 lPlA l 3 l V l S l 141 l@l LICENSEE CODE 15 0 l0 l- l 0 l uCENaE l 0 l 0 -- l0 l025l@l4 0 l 0 NUMBER 26 l1UCENSE l1 l1TYPE l1 J0l@l57 CAT l SS l@

CON'T "7

o 7

1 8

"$RC 60l L l@l 61 0 l 5 DOCKET l 0 l 0NUM8ERl 0 l 3 l 368l 469@[1EVENT l 0 OATE l 1 l 3 l 774 l 9 @ ]REPORT 75 1l 1lDATE31 7l 9l@ 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 o 4 l and the channel bistables were placed in the tripped position. The health and I 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. l 0 7 l l o a l I 80 7 8 9 E CODE S SC E COMPONENT CODE SUSCbOE SU E 7

O 9 8 9 l Il A @ lE l@ l El@ l Il Nl Sl Tl Rl Ul@ l Y l@ l 21@

10 11 12 13 18 19 20 SEQUENTIAL OCCURRENCE REPORT REVISION

_ EVENT YEAR REPORT NO. CODE TYPE N O.

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_ 21 7l9l 22 23

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24 26

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27 l0 l 3l 28 29 l Ll 30

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31 W32 T N AC ON ON PLANT MET HOURS S8 I FOR h 8. S P LIE MANUFACTURER lDl@lZl@ WQ l36Z l@ l 0l 0j 0l 0l lN l@ Yl@ lNl@ l W l 1 l 2 l 47 0l@

33 34 35 37 du 44 42 43 44 CAUSE DESCRIPTION AND CC3RECTIVE ACTIONS h i o l The incident resulted from a loose printed circuit cavi in the instrument loop. I

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

, 7 l returned to service.

I Li Lu I i 4 l l 7 8 9 So ST S  % POWER OTHER STATUS Ots Y DISCOVERY DESCRIPTION y El@ l 0 l 4 l 9 l@l N/A l lA l@lOperatorobservation l AfTIVITY CO TENT RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE N/A N/A l ITl6l8 9LZ_] @3 OF RELEASE l Zl@l 7 to 11 44 l l 45 80 PERSONNEL E)tPOSURES NUM8ER TYPE DESCRIPTION 1

Tl l 0 l 0 l 0 l@l Z l@l N/A l PERSO~NE'L imu'4ES

~uM8tR oESCRiPTiON@

1 a 10l0j0l@l N/A 80 l

7 8 9 1t 12 LOSS of OR DAMAGE TO FACILITY TYPE DESCRIPTION

[Tlil 8l 9Z l@l N/A 13$3 3kh l

7 10 80

"'*"'JESCRiPTiONO 7 911200 Q7 NRC uSE ONLY l1llllll1IIili 2 o IN iSSuEf@l N/A l 7 8 9 to 68 69 80 1;

• 8 PHONE:

412-643-1258  ?

NAME OF PREPARER