ML20052C205

LER 82-004/01T-0:on 820410,ASCO Inboard & Outboard Drywell Vent 3-way Solenoid Valves,Model 830064C64U,failed to Close Upon Hand Switch Activation When Coil de-energized.Probably Caused by Horizontally Mounted Solenoids.Valves Replaced

ML20052C205
Person / Time
Site:	Monticello
Issue date:	04/23/1982
From:	Wajchouski A NORTHERN STATES POWER CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
Shared Package
ML20052C195	List: ML20052C194 ML20052C205
References
LER-82-004-01T, LER-82-4-1T, NUDOCS 8205040494
Download: ML20052C205 (1)

Text

NRC FORM 366 U. L. NUCLEA*) REGUL ATC RY COMMISSl!N (7 77)

LICENSEE EVENT REPORT CONTROL BLOCK: l 1

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(PLEASE PRINT OR TYPE ALL REQUIRED INFORMATION) l0 l1l8 9l Ml Nl Ml Nl Pl1 l@l 0 l 0 l - l 0UCENSE 7 14 15 l 0 lNUMBEH 0l 0l 0l- l0 l0j@l 25 4 l1 l 1 l 1l 1l@l -l lg LICENSEE CODE 26 UCENSE TveE JO 57 CAT 58 CON'T lW 7 8 57,7E lLl@l0l510l0l0l2l613l@l0141110l8l2'l@l014l2l318l2l@

60 61 68 69 74 75 80 DOCKET NUMBE R EVENT DATE REPORT DATE EVENT DESCRIPTION AND PROBABLE CONSEQUENCES h l o 121 I n, ring prep,rneinn rnr p1,nt etnrtun; inknnrn nna nnthnnrd 18" drvwell -

I iOi,, ; vent valves failed to close upon hand switch activation. Occurrence ,

l o 14 I I reportable under Technical Specification 6.7.B.1.i. Valves were opened  ;

I io isi i following a reactor scram to deinert the drywell and were maintained ,

lo is i i in an open position for approximately 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> prior to attemping to  ;

IoI7II close. No previous similar reportable events. No effect on public health l 1o ta 1 I or safety. I 7 8 9 80 C DE CODE SUB E CO*.**0NENT CODE SuBC dE SU OE lo191 7 8 9 l s i n l@ [Ej@ [fj @ l V l Al L l VI 0l Pl@ lD l@ [Z_J @

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3 31 40 41 42 43 44 47 CAUSE DESCRIPTION AND CORRECTIVE ACTIONS h liioll Two AS O 3 way Solenoid valves model 830064C64U, failed to vent when coil  ;

Ii i iI deenercized. Probable cause, solenoids mounted horizontally'(which i ii i >I I decrease openine force and increase f riction) and possible residual core  ;

i a l mnonet i m. All nurce and vent valve solenoids replaced with new _

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