05000306/LER-1979-003-03, /03L-0 on 790216:overtemperature Summing Unit 2TM-401B Drifted & Allowed High Trip Pressure.Device Recalibrated.Device Performance Being Evaluated Frequently

/03L-0 on 790216:overtemperature Summing Unit 2TM-401B Drifted & Allowed High Trip Pressure.Device Recalibrated.Device Performance Being Evaluated Frequently

ML19263D001
Person / Time
Site:	Prairie Island
Issue date:	03/16/1979
From:	Hunstad A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML19263C997	List: 05000306/LER-1979-003, Forwards LER 79-003/03L-0 05000306/LER-1979-003-03, /03L-0 on 790216:overtemperature Summing Unit 2TM-401B Drifted & Allowed High Trip Pressure.Device Recalibrated.Device Performance Being Evaluated Frequently
References
LER-79-003-03L, LER-79-3-3L, NUDOCS 7903200416
Download: ML19263D001 (1)

LER-1979-003, /03L-0 on 790216:overtemperature Summing Unit 2TM-401B Drifted & Allowed High Trip Pressure.Device Recalibrated.Device Performance Being Evaluated Frequently

Event date:
Report date:
3061979003R03 - NRC Website

text

LICENSEE EVENT REPORT CON TROL BLOCK: l l

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8 60 61 DOCKET NUVBER 68 69 EVENT DATE 74 75 RE'ORTD TE 83 EVENT DESCRIPTION AND PROB ABLE CONSEQUENCES h lo J2l l During surveillance test it was found that instrument 2TM-401B, an overtemperature I

g g ;3; g AT Summiag Unit, had drifted such that the f (AQ) input required to cause trip was l

12.157. vs. 11%, and the pressurizer pressure input required to cause trip was 2020 l

[o i, y l gn,3; g psi;; vs. 2040 psig.

Redundant channels were operable.

No effect on public health l

O 6 l and safety.

Similar occurrence was RO 79-1.

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CAUSE

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i l o l l Inst rument urift in a Foxboro Model 66RC-Ot Summine Unit. Device was fr ediatelv I

[i),j l recalibrated.

Performance of the device is being evaluated frequentiv to determine 1

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