ML20002B012

LER 80-009/03L-0:on 801101,during Normal Operation, Performance of ICP 2.14 Found P8 Permissive Bistable from Channel N44 to Be Set at 50.5%.Caused by Instrument Drift. Bistable Adjusted & Tested Satisfactorily

ML20002B012
Person / Time
Site:	Point Beach
Issue date:	11/25/1980
From:	Fay C WISCONSIN ELECTRIC POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20002B006	List: ML20002B005 ML20002B012
References
LER-80-009-03L, LER-80-9-3L, NUDOCS 8012090314
Download: ML20002B012 (1)

Text

NTC FORM 3r@ U. S. NUCLEAR RECULATORY COMMISSION (171Q LICENSEE EVENT REPORT CONTROL BLOCK: l 1

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60 61 DOCKET NUM8 ER 68 69 EVENT DATE 74 75 REPORT DATE 80 EVENT DESCRIPTION AND PAOBABLE CONSEQUENCES h l o l 21 l On 11-1-80 during normal paer operation, performance of ICP 2.14 I I o l a 1 1 (Feriodic Test Nuclear Instrumentation Power Range) found the P8 per- l lo l4 l l missive bistable from channel N44 to be set at 50.5%. This is a 2-out-l t o I s l I of-4 logic scheme and all other channels were within the 49% (+0, -1) l l 0 l6 l l specification. This event is reportable in accordance with Technical l jol7l d pecification 15.6.9.2.B.l. l 10181I l 7 8 9 80 SYSTEM CAY'E CAUSE COMP. VALVE CODE CODE SU8 CODE COMPON ENT CODE SU8 CODE SUSCODE lO19l 7 a l I l Bj@ [E_J@ l 2 l@ ! I l N l S l T l R l U l@ l X l@ W @

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JJ JS Je 31 40 el 43 44 47 CAUSE DESCRIPTION AND CORRECTh/E ACTIONS h l i t o l l The cause of the ou :-of-soecification bistable is attributed to in7tru-l lilijiment drift. The previous test of the bistable on 9-12-80 was satisfac-l i,#2; l tory. The bistable was adjusted and tested satis factory on 11-1-80. I g l The other operable channel: __ould w have provided the safety function of l iii4i l this circuit. The permissive provides for blocking of the reactor l 7 8 9' coolant flow trip when powe- is below its setpoint of 49%. ro

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