05000306/LER-1982-025, Signed LER 82-025/03L-0:on 821130,during Power Reduction,One Steam Flow Channel Differed from Redundant Channels. Transmitter Showed Out of Calibr.Cause Unknown.Transmitter Recalibr.Bistables Placed in Trip During Recalibr

Signed LER 82-025/03L-0:on 821130,during Power Reduction,One Steam Flow Channel Differed from Redundant Channels. Transmitter Showed Out of Calibr.Cause Unknown.Transmitter Recalibr.Bistables Placed in Trip During Recalibr

ML20028C368
Person / Time
Site:	Prairie Island
Issue date:	12/30/1982
From:	Hunstad A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20028C362	List: 05000306/LER-1982-025, Signed LER 82-025/03L-0:on 821130,during Power Reduction,One Steam Flow Channel Differed from Redundant Channels. Transmitter Showed Out of Calibr.Cause Unknown.Transmitter Recalibr.Bistables Placed in Trip During Recalibr
References
LER-82-025-03L-01, LER-82-25-3L-1, NUDOCS 8301070404
Download: ML20028C368 (1)

LER-1982-025, Signed LER 82-025/03L-0:on 821130,during Power Reduction,One Steam Flow Channel Differed from Redundant Channels. Transmitter Showed Out of Calibr.Cause Unknown.Transmitter Recalibr.Bistables Placed in Trip During Recalibr

Event date:
Report date:
3061982025R00 - NRC Website

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60 61 DOCKET NUMBER 68 69 EVENT DATE 74 75 REPORT O ATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h Ml During a power reduction, one steam flow channel was observed to differ from I

ibTTlI redundant channels.

Investigation showed the transmitter to be out of l

I"5 TTI l calibration; transmitter span had collapsed by about 15% equally on the high l

o 3 l and low ends. Not repetitive. Tech Spec Tables 3.5-2 and 3.5-4 apply. No l

o s l effect on public health and safety since redundant channels were operable.

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l gl returned to service. Appropriate bistables were placed in trip during l

, 2 l recalibration. Rosemount Model 1153 HAG differential pressure transmitter.

I g g,j l Transmitter will be observed and if continued drif t occurs will be replaced.

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