ML19345B736

LER 80-038/03L-0:on 801027,during Refueling Operations LIS- 2-3-72A Isolated from Svc During Installation of Analog Trip Sys.Cause Not Stated.New Analog Instrument Installed

ML19345B736
Person / Time
Site:	Vermont Yankee
Issue date:	11/26/1980
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML19345B733	List: ML19345B732 ML19345B736
References
LER-80-038-03L, LER-80-38-3L, NUDOCS 8012020439
Download: ML19345B736 (1)

Text

w U. S. NUCLEAR RE1ULATO%Y COMMISS3ON LICENSEE EVENT REPORT LER 80-38/3L

/ CONTROL SLCCK: l l l l l l' lh NLEASE MINT oR TYPE ALL REQUIRED !NFORMATICNI lo ill4 l9VI Tl Vl Yi Sl 1l@l 010 l- l 01010 j 0 l 0 l -l 010 l@l 4 uCENSE

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1 4 60 61 CCCKET NUM8ER id 69 EVENT QATE 14 75 MEPCRT CAT 3 30 EVENT CESCRIPTICN AND PRCSA8LE CONSECUENCES h Ioi2l l During refueling operations LIS-2-3-72A was isolated from service during installa- [

10,31 l tion of the analog trip system without first failing the trip system as required by l lotal l T.S. Table 3.2.1. At the time the instrument was isolated, both core spray systems l Ioisl I were required to be operable per T.S. 3.5.H.4. All other level instruments for the I l o is I l systems were onerable and would have initiated core sorav if recuired. There were  !

loI7i l no significant occurrences as a result of this event nor were there any adverse i I o 6 3 I I af fects to oublic health or saf etv. I 7 8 9 $0 SYSTEM CAUSE CAUSE COMP. VALVE CODE COCE SUSCCOE COMPCN ENY CO CE SU8 CODE SU8COCE loisl 7 4 lI IB l@ lA l@ l A l@ lZ lZ lZ lZ lZ l Z lh lZ l@ lZ l@

3 10 11 12 13 18 19 20 SECUENTIAL CCOURRENCE REPCRT REVISION t.E 4 / 4o (V ENT VEAR REPORT NO. C006 TV'E No.

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42 u 47 CAunE DESCRIPTION AND CORRECTIVE ACTIONS @

l i ; a l [ An I&C Technician requested permission to isolate LIS-2-3-72A in accordance with an l l i 6, l l approved installation procedure so that it could be replaced with a new analoe in- 1 i, ,7i ] striimeat. The instrument was allowed to be isolated without first failing the trip 1 i i63l l circuit. When the error was realized the work was immediatelv stopped and the trio I i i14 i I circuit was properly failed as recuired by T.S. Table 3.2.1. I 7 s 3 so Yr'2'@

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