ML19341C635

LER 81-006/03L-0:on 810127,ATWS/recirculation Pump Trip High Pressure Trip Points from PT-2-3-56Bm,56Cm & 56Dm Tripped Above Tech Spec Level During Surveillance Testing Per Operation Procedure 4342.Caused by Instrument Drift

ML19341C635
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	02/25/1981
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19341C631	List: ML19341C630 ML19341C635
References
LER-81-006-03L, LER-81-6-3L, NUDOCS 8103030856
Download: ML19341C635 (1)

Text

NSC FCIM 384 U. S. NUCLEAR REGULATORY COMMISSION

, LICENSEE EVENT REPORT LER 81-06/3L CONTROL BLOCK: l l l l l l lh (PLEASE PRINT OR TYPE ALL REQUIREO INFORMATION) lo lil8l9VI TlLICENSEE 7

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COvT 10I I 5 uRCE l L l@l 0l 5 l0 l0 l0 l 2 l 7 l1 )@l 0 l 1 l 2 l 7 l 8 l 1 l@l 74 075 l 2 l 2 l 51 8 l 1,s 80 7 8 60 61 COCKET NUMBER 68 69 EVENT DATE REPORT DATE EVENT DESCRIPTION ANO PROBA8LE CONSEQUENCES h l o 121 l During normal operation while performing surveillance testing per 0.P. 4342 the l 50,3; (ATWS/RPT high pressure trip points from PT-2-3-56Bm, 56Cm, & 56Dm were found to trip; l o 141 1 1 to 2 psi higher than allowed in Tech. Spec. Table 3.2.1. There were 'no signifi- l 10 ; s ; l cant effects as a result of this event, nor were there any adverse affects to public;

, t o is l l health or safety. This event is r.ot repetative. I l017l l ,

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40 43 44 47 CAUSE OESCRIPTION ANO CORF ECTIVE ACTIONS @

l i l o l l The instruments invclved are all master trip units associated with a Rosemount modell ,

m I510 DU Trip /Calibra: ion System which was installed during the past refueling outage. I l i 121 I The cause for the out-of-specification cot:dition is instrument drif t. The instru- I lil3l lments were immediately adjusted to the required setpoints. I tilai I l 7 8 9 80 ST  % POWER OTH ER STATUS is RY DISCOVERY DESCRIPTION I1 l5 l W@ l 1 l 0 l 0 l@l NA l lBl@l Surveillance Testing l ACTtvlTV CO TENT RELEASE AMOUNT 08 ACTIVITY LOCATION OP RELEASE fits 819L7J @D 08 RELEASEL7J@l 7 10 11 NA 44 I I 45 NA 80 l

PERSONNEL EXPOSURES NUV8ER TYPE DESCRIPTION ,

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