ML20050A378

LER 82-006/03L-0:on 820219,during Normal Surveillance on Differential Pressure Switches DPIS 2-120 A,B,C & D,Switches A,B & C Found to Be Out of Tech Spec Limits.Caused by Setpoint Drift.Switches Reset to within Required Tolerance

ML20050A378
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	03/21/1982
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20050A377	List: ML20050A376 ML20050A378
References
LER-82-006-03L, LER-82-6-3L, NUDOCS 8204010229
Download: ML20050A378 (1)

Text

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LICENSEE EVENT REPORT LER 82-6/3L CONTROL BLOCL l l l l l l (PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) l0 l1ltl l9 VI TlLICENSEE 7

Vl YlCOOE Sl 1 l@l 0 l 0 l - l 0 luCENSE 14 15 0 l 0NUVBEH l 0 l0 l- l0 lo l@l 25 426 l 1LICENSE l 1 l 1TYPE l 1JOl@l57 C Al T 58l@

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$"d l L60 hl 0 61l 5 l 0 lDOCK 0 lET0NUMBER l 2 l 7 l1 68l@l0 69 l2 11 l9 l 8 ] 2 l@l 0 l 3REPORT EVENT DATE 74 75 l 211DATEl 812 80 l@

EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h 10 l 21 l During normal surveillance on the dif ferential pressure switches DPIS 2-120 A, B, C, l

g ;3; ; & D, switches A, B & C were found to be out of limits in accordance with Tech. Spec. l yg,,; ; Table 3.2.2. Since a plant shutdown occurred af ter the last successful surveillance, l

g;. j ; the switches are assumed to have been out of limits during the shutdown. However, sincq Io I6 l l this trip function was not challenged during this period, there were no consequences to l

g;,; ; the health and safety of the public. There have been no previous reportable occurrenceq of this type.

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7 8 9 SNSTEM CAUSE CAUSE COMP. VALVE CODE CODE SUBCODE COYPONENT CODE SUBCODE SU7 CODE 1019l l ClCl h W h lZ lh l T lNj S lT lR lU lh l Elh W h 10 12 18 19 20 7 8 9 11 12

,, SEQUENTI AL OCCURRENCE REPORT REVISION LEA cVENT YEAR REPORT NO. CODE TYPE N O.

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_ 21 22 23 24 26 27 28 29 30 31 32 TA EN ACT ON ON PL NT MET HOURS S8 IT FOR 8. SUPPLIE MANUFAC URER l33E l@l34 Zl@ l35Z l@ W@

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CAUSE DESCRIPTION AND CORRECTIVE ACTIONS l i l o l l The cause of this occurrence is attributed to setpoint drift. The switches worn roene I l lil l to within required procedural tolerance. The switches were manufactured hv Rnrenn I

,,,,, yInstrument Co., Model #260. l Lilli l l

[1 {4l l l 7 8 9 80 ST s ".POWER OTHER STATUS ISCO RY DISCOVERY DESCRIPTION NA Surveillance Testing l l 5 l l E l@ l 1l 0 l 0l@l l lBl@l l A TlVITY CO TENT RELE ASED OF RELE ASE AN10UNT OF ACTIVITY LOCATION OF RELEASE ltlsl3 W 7 3

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PERSONNEL F xPOSURES NUYBE R l i l 7 l l 0 l 0 l 0 [Ql Zl TYPE @l DESCRIPTION NA 80 l

PERSONNE L INJURIES NUveER DESCRiPTiONh '

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[TT 8l l9 0 l 010 l@l12 7 11 80 LOSS OF OR DA\iAGE TO FACILITY TvPE DESCRIPTION NA j ITT51 7

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8204010 82032 NA l lllI!IIIIIIIII l gDRADGCK 05000271 68 59 80 s PDR NAME OF PREPARER W rren P. Murphy pgggg; (802) 257-7711 g