ML19340B575

LER 80-035/03L-0:on 801007,main Steam Relief Valves Had as-found Setpoint of 1,093 Psig,Exceeding Max Setpoint. Deviation Caused by Setpoint Drift.Valve Disassembled & Rebuilt & Setpoint Readjusted

ML19340B575
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	11/06/1980
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19340B571	List: ML19340B570 ML19340B575
References
LER-80-035-03L, LER-80-35-3L, NUDOCS 8011110313
Download: ML19340B575 (1)

Text

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? 4 60 66 ;OCKET NUM6ER 53 63 EV ENT CATg 74 75 REPORT OATE EVENT CESCRIPTION AND PACSABLE CONSECUENCES h 10!21l gh41g bench-checking the Main Steam Relief Valves per T.S. 4.6.D.2, S/N67HH12 had I t o i a l ! an as-found setpoint of 1093 psig. T.S.2.2.3 requires the setpoint to be </= l lo i4l l 1090 osie. Since the ADS Svtem was continually operable, and the safetv/ relief l l085II function of the valve would have opened at 1093 psig, there were no consequences to l 10 !s I l nnh14e safety. Similar occurrences reported to the Commission were LER 78-10/3L l (T,7 l and LER 79-27/3L. I 6 3 !a l ! l 7 6 3 30 SYSTEM OAUSE CAUSE COMia va Lv E COOE COOE SUSCOOE COMPONENT OOOE SUscOCE SUSCOOE 10!91 7

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44 47 CAUSE CESCRIPTICN AND CCRAECTIVE ACTIONS I i I a i ! The dr. iacion from the recuired setpoint was attributed to setpoint drif t. The l 1i!il I valve var disassembled, reb uil t , and the setooint adiusted co 1082 nsie on 10/14/80.l t i I ,1 1 This valve has been sent to an independent laboratory to verify the setpoint usine l Iit3I I stean, and will be reinstalled at a later date, l 11 14 Il  !

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