ML19210E297

LER 79-041/03X-1:on 791026,malfunctions in 1C Circulator Speed Measurement Caused Loss of Circulator High Speed Signals.Caused by Electronic Circuit Unbalance Due to Signal Cable Resistance Change.Modifier Adjusted & Checked Weekly

ML19210E297
Person / Time
Site:	Fort Saint Vrain
Issue date:	11/19/1979
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19210E296	List: ML19210E295 ML19210E297
References
LER-79-041-03X, LER-79-41-3X, NUDOCS 7912040298
Download: ML19210E297 (1)

Text

NRQ FORM 366 U.S. NUCLEAR REGULATORY COMMISSION (7 77)

LICENSEE EVENT REP 3RT CONTROL BLOCK: l 1-l l l l l lh 6

(PLEAS 5 PRINT OR TYPE ALL REQUIRED INFORMATION) 7 o i 8 3 l 0 l 0LICENSEE lFlS CODE l V l 141 l@l 15 0 l 0 l - l 0 LICENSE l 0 l 0NUMBER l 0 l 0 l- l 0 l 025l@l744 l1LICENSE l 1 l 2TYPE l 0Fil@l57 CAT l 58 l@

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7 d 60 68 75 REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h o 2 Operations personnel observed that malfunctions in 1C circulator speed measurement I o 3 I caused loss of circulator high speed signals. Reportable per Technical Specification l o ,, j AC 7.5.2(b)2, operation under a degraded mode permitted by LCO 4.4.1. No effect on l o s l plant operation. Probable consequence was loss of high speed circulator trip function; O 6 l to one of three channels. No affect on public .alth or safety. Redundant system o 7 i available and operable. Similar report RO 76-05. l 0l8 l  !

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33 34 35 31 40 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACMt3 1 o l General Atomic circulator speed / wobble modifiers caused a loss o f olant protective l i i svatem functions to histh speed trio circuits due to electronic circuit unb alance f

, 2i i caused by sistnal cable resistance change. Modifier adjusted and channel function l 3 l restored. Adjustment of speed moJifiers being checked weekiv. New connectors  !

i A [ ordered.  ;

7 8 9 30 SA S  % POWER OTHER STATUS DIS RY DISCOVERY DESCRIPTION 1 5 [E_j@ l0 l 3 l 0 l@l N/A l l A l@l Operator Observation l ACTIVITY CO'0 TENT aELE ASEo CP RELEASE AMOUNT OP ACTIVITY LOCATION OF RELE ASE is l Z l @ l Z [g N/A l lN/A l 7 8 9 10 11 44 45 30 PERSONNEL EXPOSURES NUY8ER TYPE D ESCRIPTION t 7 l 0 ] 0 l 0 l@l Z l@l N/A l PeRSONN E t imau' Ries NUMBER DESCRIPT1CN i

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