05000348/LER-1981-054-03, /03L-0:on 810730,instrument Channel N-43 Was Declared Inoperable When High Flux Trip Setpoint Exceeded Acceptance Criteria.Caused by Setpoint Drift.Trip Setpoint Reset

/03L-0:on 810730,instrument Channel N-43 Was Declared Inoperable When High Flux Trip Setpoint Exceeded Acceptance Criteria.Caused by Setpoint Drift.Trip Setpoint Reset

ML20010F173
Person / Time
Site:	Farley
Issue date:	08/31/1981
From:	Hairston W ALABAMA POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML20010F170	List: 05000348/LER-1981-054-03, /03L-0:on 810730,instrument Channel N-43 Was Declared Inoperable When High Flux Trip Setpoint Exceeded Acceptance Criteria.Caused by Setpoint Drift.Trip Setpoint Reset 05000348/LER-1981-055-03, /03L-0:on 810728,during Review of Monthly Surveillance Schedule,Determined That Surveillance Test FNP-1-STP-227.1B Had Not Been Performed for Apr,May or June. Caused by Error in Scheduling ML20010F169
References
LER-81-054-03L, LER-81-54-3L, NUDOCS 8109090456
Download: ML20010F173 (1)

LER-1981-054, /03L-0:on 810730,instrument Channel N-43 Was Declared Inoperable When High Flux Trip Setpoint Exceeded Acceptance Criteria.Caused by Setpoint Drift.Trip Setpoint Reset

Event date:
Report date:
3481981054R03 - NRC Website

text

LICEISEE EVENT REPORT CCNTROLBlocth l

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60 61 COCKET NUMSEa 6d 69 EVENT OATC 74 75 REPORT DATE 80 E'.'ENT DESCRIPTION AND PRL8ABLE CONSEQUENCES h sol2l l At 0545 on 7/30/81 while conducting FNP-1-STP-41.3 (Power Range Functional Test Channels l [o}3l l N-41-(2) (3)), instrument Dannel N-43 was declared inoperable when the high flux trip l

lol4l l setpoint exceeded the acceptance criteria (111% actual vs 110% required). Tech. Spec.

l 10lsj j 3.3.1.1 requiu s channel N-43 to be operable. Tech. Spec. 3.3.1.1 action statement l

.Iojal l requirements were met.

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CAUSE DESCRIPTION A6.0 CORRECTIVE ACTIONS l i j o l l This event was caused by instrument setpoint drif t.

The trip setpoint was reset and the f [ijij l bistable exercised several times without any noticeable variation in the trip point.

l l,l2l l Following successful completion of the survaillance test, instrument channel N-43 was I

g,!3l l returned to service at 1130 on 7/30/81.

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