ML20028C244

LER 82-025/03L-0:on 821130,one Steam Flow Channel Differed from Redundant Channels During Power Reduction Due to out- of-calibr Transmitter.Cause Not Known.Transmitter Recalibr & Returned to Svc.Transmitter to Be Replaced If Drift Recurs

ML20028C244
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
ML20028C240	List: ML20028C239 ML20028C244
References
LER-82-025-03L, LER-82-25-3L, NUDOCS 8301070250
Download: ML20028C244 (1)

Text

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7 8 69 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h lo [2] l During a power reduction, one steam flow channel was observed to differ from l l O 13 l l redundant channels. Investigation showed the transmitter to be out of l I'5 TT1 I calibration; transmitter span had collapsed by about 15% equally on the high l 101 s 1 l and low ends. Not repetitive. Tech Spec Tables 3.5-2 and 3.5-4 apply. No l l 0 l6 l l effect on public health and safety since redundant channels were operable. l l 0Til I I l O 181 I l 7 8 9 80 SYSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUSCODE COMPONENT CODE SUSCODE SUSCODE 7

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43 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h gl Cause not known. Transmitter was responsive to recalibration and has been l yI returned to service. Appropriate bistables were placed in trip during I gl recalibration. Rosemount Model 1153 HAG differential pressure transmitter. I gl Transmitter will be observed and if continued drif t occurs will be replaced. I L1 L* I I l 7 8 9 80 ST S  % POWER OTH E R STA TUS dis O RY DISCOVERY DESCRsPTION y y@ l 0 l 8 l 9 l@l NA l l B l@l Operator observation l ACTIVITY CO TENT RELE ASED OF RELEASE AVOUNT OF ACTIVITY LOCATION OF RELEASE

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