05000267/LER-1979-041-03, /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

/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: 05000267/LER-1979-041, Fowards LER 79-041/03L-0 05000267/LER-1979-041-03, /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
References
LER-79-041-03L, LER-79-41-3L, NUDOCS 7910310338
Download: ML19254E222 (4)

LER-1979-041, /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

Event date:
Report date:
2671979041R03 - NRC Website

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LICENSEE EVENT REPORT CONTROL BLOCK: l l

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8 60 61 DOCKEY NUMBER 68 69 EVENT DATE 74 75 REPORT DATE 80 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.

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l Technical Specification AC 7.5.2(b)2, operation under a degraded mode permitted ov l

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No effect on plant operation.

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0 s l speed circulator trip function to one of three channels. No affect on oublic health I

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l or safety.

Redundant system available and operable. Similar report RO 78-05.

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10 11 12 13 18 11 20 SEQUENTI AL OCCURRENCE REPORT REVfSION

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O l General Atomic circulator speed / wobble modifiera caused n loss of elant orotective l

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system functions to high speed trio circuits due to electronic cirenit-unk n i n m-a 1

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7 8 9 10 11 44 45 80 PERSONNEL EXPOSURES Z lhl DESCRIPTION l

10 10 l 0 lhl TYPE NUMBER N/A 1

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7 31 TYPE DESCPIPTION N/

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