ML20028C368

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: ML20028C361 ML20028C368
References
LER-82-025-03L-01, LER-82-25-3L-1, NUDOCS 8301070404
Download: ML20028C368 (1)

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7 8 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. l f6Til l I Lo_j.8_l l 1 7 8 9 80 E CODE S BC E COMPONENT CODE Su8 CODE SU E 7

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47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS 27 i O l Cause not known. Transmitter was responsive to recalibration and has been l 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. l L'l.*.]8 9I 7 80 I

SA S 4 POWER OTHE R STA TUS IS O RY DISCOVERY DESCRIPTION y y@ l 0l 8 l 9 l@l NA l l B l@l Operator observation l A TIVITY CO TENT aELEASEo OP REtrASE LOCATION OP RELEASE W l8 Z 7 9 l @ ((@l 10 11 NA AMOUNT OP ACTIVITY 44 l NA 45

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