05000271/LER-1980-038-03, /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

/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 File:NorthStar Vermont Yankee icon.png
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: 05000271/LER-1980-038, Forwards LER 80-038/03L-0 05000271/LER-1980-038-03, /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
References
LER-80-038-03L, LER-80-38-3L, NUDOCS 8012020439
Download: ML19345B736 (1)

LER-1980-038, /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

Event date:
Report date:
2711980038R03 - NRC Website

text

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

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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

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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.

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