ML19254E222

LER 79-041/03L-0:on 791005,malfunctions in Circulator 1A Speed Measurement Caused Loss of High Speed Signals.Caused by Circuit Imbalance Due to Signal Cable Resistance Change. Modifiers Adjusted & Channel Function Restored

ML19254E222
Person / Time
Site:	Fort Saint Vrain
Issue date:	10/25/1979
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19254E205	List: ML19254E204 ML19254E222
References
LER-79-041-03L, LER-79-41-3L, NUDOCS 7910310338
Download: ML19254E222 (4)

Text

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LICENSEE EVENT REPORT CONTROL BLOCK: l 1

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(PLEASE PRINT OR TYPE - QUIRED INFORMATION) 0 1 -l 0 0 0lNUMBER 0l 0l -l 0l 0l@Q l ll 2l 0 @ l57 CAT l l@

7 8 l C l LICENSEE 9 0 l F CODE l S l V l 1 l@15l 0l 0LICENSE 14 25 26 wlCENSE TYPE JO 58 CON'T 7

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60 61 0 l 5 l0 l0 l0 l2 l617 @l1 DOCKEY NUMBER 68 69 l0EVENT l0 l517 DATE l9 l@l1 l0REPORT 74 75 l2 l517 DATE l980l@

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 lOperations personnel observed that malfunctions in lA circulator sneed measurement l 0 3 l caused loss of circulator high speed signals. Reoortable per I o A l Technical Specification AC 7.5.2(b)2, operation under a degraded mode permitted ov l 0 s lLCO 4.4.1. No effect on plant operation. Probable consequence was loss of high l 0 s l speed circulator trip function to one of three channels. No affect on oublic health I O 7 l or safety. Redundant system available and operable. Similar report RO 78-05. I O 8 i __

I 80 7 8 9 SYSTEM CAUSE CAUSE COMP. VALVL CODE CODE SU8 CODE COMPONENT CODE SUSCODE SUSCODE 7

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lI lB lh 9 10 11 h lE lh lIlNlSlTlLlU.h W h W h 12 13 18 11 20 SEQUENTI AL OCCURRENCE REPORT REVfSION

,,,, EVENT YE AR R EPORT NO. CODE TYPE NO.

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33 36 31 42 C CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h 1 O l General Atomic circulator speed / wobble modifiera caused n loss of elant orotective l i 1 system functions to high speed trio circuits due to electronic cirenit- unk n i n m-a 1 i 2 Icaused by signal cable resistanc change. Modifier adiusted, and channel function I ila irestored. Adj ustment of speed modifiers being checked weeklv. New connectors _]

i A l ordered. l 7 8 9 80 STA  % POWER OTHER STATUS 015 O RY DISCOVERY DESCRIPTION 1

Sl lE lh l0 l3 l0 lhl N/A l lA lhl Operator Observation l AfTIVITY CO TENT RELEASED OF RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE 1 6 h [_Z,j @ l N/A l lN/A l 7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES NUMBER 1 7 10 10 l 0 lhl ZTYPE lhl DESCRIPTION N/A l PERSONNE L INJURIES NUMBER DESCRIPTION 7

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LOSS OF OR DAMAGE TO FACILITY h TYPE DESCPIPTION N/

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1 9 lZl@l N/A l 7 d 9 10 80 ISSUE DE CRIPTION

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NAME OF PREPARER 2 # l N- C4hEl PHONE: I 30 M 795-2253 a

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