ML20010C683

LER 81-018/03L-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

ML20010C683
Person / Time
Site:	Vermont Yankee
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: ML20010C673 ML20010C683
References
LER-81-018-03L, LER-81-18-3L, NUDOCS 8108200307
Download: ML20010C683 (1)

Text

NRC FOAM 386 U. S. NUCLEAR REGULATORY COMMISSION o.m

• LICENSEE EVENT REPORT LER 81-18/3L CONTROL BLOCK: l 1

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION)

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1. 8 60 61 DOCKET NUMB E R 68 69 EVENT DATE REPORT DATE 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 IoIalltype. I 80 7 8 9 E COCE SUSC E COMPONENT CODE SL8 COD'E SU E 1ol91 ls lp l@ W@ l Zl@ l Cl Kl Tl Bl Rl Kl@ lA l@ l Zl@ 18 19 20 7 8 9 10 11 12 13

_ SEQUENTIAL OCCURRENCE REPORT REVISION LE R!RO EVENTYEAR R EPORT NO. CODE TYPE N O.

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_ 29 l811l 22 l-l 23 l O l ll 8l 24 26 l/l 27 l 0l 3l 28 29 W

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35 36 31 40 41 42 43 44 47 CAUSE OESCRIPTION AND CORRECTIVE ACTIONS @

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 g lwith the operators. l 7 8 9 80 U  % POWER OTHER STATUS DISCO RY DISCOVERY DESCRIPTION NA Operator Observation I1 l5* l l E l@ l1 l 0 l 0'*l@l" l lB l@l

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AETiviTY COMTENT RELEASE AMOUNT OF ACTIVITY LOCATION OF RELEASE NA l i l 8s9l W @D OF RELEASE (Z_J@l 7 10 11 44 l l 45 NA 80 l

PERSONNEL E4POSURES NUMGER DESCRIPTION lil7ll0l0l0lhlTYPEZ lhl" NA l

PERSONNE L ,~2u'!,ES NuMeER oESCRiPTiON@

NA l l'iT'l 8l O 7 9 I O I O l@l12 11 80 LOSS OF OM DAMAGE TO F ACILITY TYPE CESCRIPTION

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[iil lSUEf@CESCRiPTION N j NA l lllllI]ll!lll{ l 7 89 10 68 69 80 & l 810:200307 810812 EPARER Warren P. Murnhv $

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