ML19263D001

LER 79-003/03L-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: ML19263C996 ML19263D001
References
LER-79-003-03L, LER-79-3-3L, NUDOCS 7903200416
Download: ML19263D001 (1)

Text

LICENSEE EVENT REPORT CON TROL BLOCK: l 1

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lh (PLEASE PRINT OR TYPE ALL REQU' RED INFORMATION) lo lil IM ! N l I l N l 214l@l15 0 l 0 l- l 0 lLICENSE 0 l 0NUYHLH l0l0 -

0 l 0 l@!4 LICENSE 25 26 l1l1l1l1l@lTvPE JO l

SJ LAI 56 l@

7 8 9 LICENSEE CODE CON'T a

ITTTl s = ltl@l0l510l0l0l3l0lel@lol2l3 I n l 719 @lo l 3 l1RE'ORTD 74 75 l6 l TE7 l 9 @ 83 7 8 60 61 DOCKET NUVBER 68 69 EVENT DATE 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

[o i, y l 12.157. vs. 11%, and the pressurizer pressure input required to cause trip was 2020 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. l 0  ? l l l

l0 HIl 7 8 9 SYSTEM CAUSE CAUSE C OY P. VALvf CODE CODE SUBCOOr COYPONENT CODE S US ',C D E SueCODE 10191

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,,,, SEQUENTI AL OCCUR 4E NCE REFORT HEVIPON LE E V E'e T YE A H HEPORT NO CODE TYPE NO

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23 1010131 24 /ti M2/

10131 26 JJ JJ Li B 31 1 01 32 ACTION FUTUAE EFFECT SHUTDOWN ATT AC HY E N T NP P D-4 PRtVE COYP. COYPONF N T TAKEN ACTICN ON PL ANT YETHOO HOURS e SUBYlTTE D FORU dbli. SUPPLIE H Y ANL T A 'TUHE u IJ3 cl@LKj@ J4 LzJ@

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[YJh l Nlh IF l1 l8lO!h 42 43 44 4; 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

,,,,j g if further corrective action is required. J I

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1 .i 2 STA VPCnER OTHEH5tATLS t, O Y DISCOV F HV C E 9 3* '1 * *-

i 5 [li_j @ l ll 0l 0l@l N/A l IB lhl Routine Surveillance Test j t.(, f l V I T Y CONTENT AF LE ASED OF RE LE ASF AYCtJNT GF AC TIVIT V LfA AfiGN Os nc. ten!L 1

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