ML19309A510

Supplemental LER 78-005/03X-3:on 780111,operations Personnel Observed That Malfunctions in Circulator Speed Measurement Resulted in Loss of High Speed Signals.Caused by Circuit Unbalance in Connectors

ML19309A510
Person / Time
Site:	Fort Saint Vrain
Issue date:	03/18/1980
From:	Gahm J PUBLIC SERVICE CO. OF COLORADO
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION IV)
Shared Package
ML19309A506	List: ML19309A505 ML19309A510
References
LER-78-005-03X, LER-78-5-3X, NUDOCS 8003310378
Download: ML19309A510 (1)

Text

NRC FCRM 3M U. S. NUCLEAR REGULATORY COMMISSION

• (7 77) .

LICENSEE EVENT REPORT U

CCNTROL BLOCK: l 1

l l l l l Ih 6

(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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57 CAT $8 l@

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7 8 60 61 DOCK ET NUMBER 68 69 EVENT OATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l0l2l i Operations personnel observed that malfunctions in circulator speed measurement l 10 l 31 l caused loss of circulator high speed signals. Reportable per Technical Specification l 10 l 4 l l AC 7.5.2(b)2, operation under a degraded mode permitted by LCO 4.4.1, Table 4.4-3. l 10 i s t l No effect on plant operation. Probable consequence was loss of high speed circulated E] trip function to one of three channels. No affect on public health or safety. l l0l7ll Redundant system available and operable. Similar report RO 79-41. l 10181I l 7 8 9 80 DE CODE SU C E COMPONENT CODE SUB ODF SU E lo19l 7 8 l_Il Bl@ Wh l E lh lI lN lS lT lR lU l@ J@ l Zl@

9 10 11 12 13 18 19 20 SEQUENTI AL OCCURRENCE REPORT REVISION

, EVENT YEAR REPORT NO. CODE TYPE N O.

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31 W

32 TK N A O ON P NT M HOURS SB I POR 8. SUPPL MANUPAC RER lXl@lXl@

33 lZl@ W@ l0 l0 l0 l0 l lY l@

31 l42Nl@ W@ l44C l 0 l 7 l 547 l@

34 36 36 40 43 4-CAUSE DESCRIPTION AND CORRECTIVE ACTIONS

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lil0ll ITT Cannon connectors for circulator speed / wobble modifiers caused a loss of olant I gl protective system functions to high speed trip circuits due to electronic circuit I It i2i i unbalance caused by simtal cable connection resistance chnnee. '*o di fie rs adius ted / l lil3l l installed spare cable (s) as required to restore channel functions. New connectors l gI were certified. installed. and circuits tested. I 7 8 9 80 STA  % POWER OTHER STATUS DISCO RY DISCOVERY DESCRIPTf 0N li Is l W@ l 0 l 1 l 3 l@l N/A l l A l@l Operator Observation l A TlVITY CO TENT RELEAsEo OPRELEASE AMOUNT OF ACTIVITY LOCATION OP RELEASE l1 l6l @ @l 11N/A l l N/A l 7 8 9 10 44 45 80 PERSONNEL EXPOSURES NUMBER TYPE DESCRIPTION l1l7i l Ol 0l 0l@l Zl@lN/A l PERSONNE L INJURIES NUM8ER DESCRIPTION l1 ls8l 9l 0l 0l 0l@l N/A 12 l

7 11 go LOSS OP OR OAMAGE TO PACILtTV i

7 8 9 to i ;'igi ;t"r' ~ sooaaio M i 80 ISSU E D ,

I u.LJ I N f8l E N/ACRIPTION i i i i i i i i i i i i i li NAME OF PREPARER , PHONE. (303) 785-2253