ML20090M773

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Ro:On 740203,during Routine Transfer of Torus Water to Radwaste,A RHR Torus Cooling Injection Valve Operator MO-2008 Motor Failed Due to Stalled Rotor Current Overheating Windings.Caused by Misaligned Components
ML20090M773
Person / Time
Site: Monticello Xcel Energy icon.png
Issue date: 02/04/1974
From: Larson C
NORTHERN STATES POWER CO.
To: James Keppler
NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NUDOCS 9105090401
Download: ML20090M773 (2)


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NORTHERN STATES COMPANY hbnticello, MinnesotaPOW$5562 3

February 4, 1974 [,

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Mr. J. G. Keppler, Regional Director ( q g.y #'

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o%e of Fegulatory Operations g ':4 United States Atmic Faergy Commission kk>/V '

799 Roosevelt Road Glen Ellyn, Illinois 61073 g pB! .6q -

Dear Mr. Keppler:

FONTIrFT f n NUCLEAR GDDATIM) pIR.T Docket No. 50-263 License No. DPR-22 On February 3,1974, during routine transfer of torus water to radaste, the "A" Residual Heat Removal (RHR) toms cooling injection valve operator (bO-2008)

otor failed due to stalled rotor current overheating the windings. The rotor '

stalled because the valve stem travel limit switches became nisaligrad. The misalignment was caused by the stem follower failing to retain the stem in its proper position, the stem position in relation to the stem followr has a direct relationship to the alignment of the stem travel limit switches.

Further investigation and repair are in progress. The valve can be operated manually if required. This failure kloes not affect LPCI operability. Isolation features are preserved by the upstream isolation valve.

Yours very t ,

C. E. Iarson L ,

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Ccpies sent by telecopier to reppler and O' Leary 9105090401 7'OPO4 PDR S ADOCK 0u000263 PDF1 , .h83 I

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  • ' AEC DISDIEUTION FOR PART 50 DOCKET TE TAL I i (TDiPORARY FOU1)

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CONTROL NO: 99I FILE:

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FROM: DATE OF DOC DATE REC'D LTR 120 RFI OTHER

orthern .'tates Power J xpany Monticello, !innesota 55362 2-4-74 2-5-74 FacsimiL:

. E . Larron TO: ORIG CC OTHER i SENT AEC PDR X J. G. Keppler 1 SENT LOCAL PDR X CLASS UNCLASS PROP IhTO INPUT NO CYS REC'D DOCKET 110:

XXX 1 50-263 DESCRIPTION: ENCLOSURES:

Facsimile reporting abnormal occurrence on 2-3-74, in which the "A" Residual Heat Removal corus cooling injection valve operator motor DO. T E

failed due to stalled rotor current overheating

he windings..........

' ACKNOWLEDGED PLANT NAME : Monticello Unit FOR /sCTIC" / I'TC<ATION 0 - 3 7J. &

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W/ Copies W/ Copies W/ Copies W/ Copies KNIEL(L) SCHDIEL(L) YOUNGBLOOD(E)

W/ Copics W/ Copies W/ Copies W/ Copics INTER"AL DISTRI BUTION MG FILE' T:CH EZVIT' DENTC:1 A/T TN AEC PDR ~ M NDRIE GRIMES LIC ASST BRAIIMAN JOC, ROOM P-506A SCILROEDER Gil' MILL M GGS (L) SAL m iAN JUNTZING/ STAFF vMACCARY KASTNER GEARIN (L) B. HURT 4ASE JC11 Gilt BALLARD GOULEQUPl:E (L) PLANS GIAllBUSSO .,,PAWLI CKI SPANGLER LE~E (L) MCDCNALD BOYD JHA0 MAIGRET (L) DUBE v/Inpu t MOORE (L)(ENR) ,,,8 TELLO ENVIRO SERVICE (L)

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