05000271/LER-1981-018-03, /03L-0:on 810713,Core Spray Subsys a Was Inoperable.Caused by Operator Holding Control Switch Closed, Resulting in Reactor Trip & Inability of Core Spray Valve V14-11A to Be Opened from Control Room.Breaker Reset

/03L-0:on 810713,Core Spray Subsys a Was Inoperable.Caused by Operator Holding Control Switch Closed, Resulting in Reactor Trip & Inability of Core Spray Valve V14-11A to Be Opened from Control Room.Breaker Reset

ML20010C683
Person / Time
Site:	Vermont Yankee File:NorthStar Vermont Yankee icon.png
Issue date:	08/12/1981
From:	Murphy W VERMONT YANKEE NUCLEAR POWER CORP.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20010C674	List: 05000271/LER-1981-018, Forwards LER 81-018/03L-0 05000271/LER-1981-018-03, /03L-0:on 810713,Core Spray Subsys a Was Inoperable.Caused by Operator Holding Control Switch Closed, Resulting in Reactor Trip & Inability of Core Spray Valve V14-11A to Be Opened from Control Room.Breaker Reset
References
LER-81-018-03L, LER-81-18-3L, NUDOCS 8108200307
Download: ML20010C683 (1)

LER-1981-018, /03L-0:on 810713,Core Spray Subsys a Was Inoperable.Caused by Operator Holding Control Switch Closed, Resulting in Reactor Trip & Inability of Core Spray Valve V14-11A to Be Opened from Control Room.Breaker Reset

Event date:
Report date:
2711981018R03 - NRC Website

text

NRC FOAM 386 U. S. NUCLEAR REGULATORY COMMISSION o.m LICENSEE EVENT REPORT LER 81-18/3L CONTROL BLOCK: l l

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8 60 61 DOCKET NUMB E R 68 69 EVENT DATE 74 iS REPORT DATE 80 EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o t a l l During monthly surveillance per T. S. 4.5.A.1.C. it was discovered that Core Spray l

1 o l 21 l Valve V14-11A could not be reopened from the control rcom due to a tripped breaker, l 1 o 14 l l leaving Core Spray Subsystem A inoperable contrary to T. S. 3.5. A.1.

V14-11A breakett 10161 l was immediately closed and the valve reopened. Core Spray Subsystem B was contin-l 10 is l l uously operable. There were no consequences to the health and safety of the public l lOI7i las a result of this ever.t.

There were no previous reportable occurrences of this l

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l i l o l l This event was caused by operator holding the control switch closed, which repeatedivl litil lenergized the motor causing excessive inrush currents which trioned the molded en w I m l breaker. The corrective action was to reset the breaker and reopen the valve with-l g l out holding the switch. Precautions on the operation of MOV's will be reviewed I

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Warren P. Murnhv 810:200307 810812 EPARER PHONE:

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