05000325/LER-1980-068-03, /03L-0:on 800901,during rod-block Monitor Blocks, a rod-block Monitor Trip Actuated at Less than Required Setpoint.Caused by Instrument Drift.Monitors Recalbr

/03L-0:on 800901,during rod-block Monitor Blocks, a rod-block Monitor Trip Actuated at Less than Required Setpoint.Caused by Instrument Drift.Monitors Recalbr

ML19338F145
Person / Time
Site:	Brunswick
Issue date:	09/30/1980
From:	Tollison A CAROLINA POWER & LIGHT CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION II)
Shared Package
ML19338F135	List: 05000325/LER-1980-068, Forwards LER 80-068/03L-0 05000325/LER-1980-068-03, /03L-0:on 800901,during rod-block Monitor Blocks, a rod-block Monitor Trip Actuated at Less than Required Setpoint.Caused by Instrument Drift.Monitors Recalbr
References
LER-80-068-03L, LER-80-68-3L, NUDOCS 8010070566
Download: ML19338F145 (1)

LER-1980-068, /03L-0:on 800901,during rod-block Monitor Blocks, a rod-block Monitor Trip Actuated at Less than Required Setpoint.Caused by Instrument Drift.Monitors Recalbr

Event date:
Report date:
3251980068R03 - NRC Website

text

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60 68 DOCKET NUMBER 68 69 EVENT DATE 74 76 REPORT DATE 80 EVENr DESCRIPTION AND PROBABLE CONSEQUENCES h lTTTl l During the' performance of RBM Rod Blocks, P.T.1.5.1, the "A" RBM high flow trip was I

o 3 l found actuating at 56.5% while the required trip setpoint is 58.6

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All other l ITTil I flow trips actuated as required. This event did not affect the health or safety of l l'B'Ts 1 I the public.

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gl was calibrated per an approved plant procedure and returned to normal operation.

I gl All RBM's are checked weekly and calibrated every six months in accordance with l

gl plant procedures. As no previous history of RBM instrument drift exists for either l gl unit. this is considered an isolated event.

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