ML20058K621

Ler:On 770127,discovered Number 3 Tip Ball Valve Failed to Close During Routine Use of Tip Sys.Cause Undetermined

ML20058K621
Person / Time
Site:	Monticello
Issue date:	02/09/1977
From:	Mayer L, Nevinski D NORTHERN STATES POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
017033, 17033, LER-LER-770209, NUDOCS 9102120679
Download: ML20058K621 (2)

Text

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, t bcENSEE EVENT REPORT 1 CourRot stocet Al i ! 71013Gl c,tuu ,.=T ,,u .a ======3 1' 6 l LCENSEE NawE LCENSE NUMBER N E lo ! w i Mi si Pl il lo I o !-l of of ol 0101-1 ol 01 I cl il il 11 il 7 89 E T PE 14 15 25 lolil  ;

26 30 31 32 i CATEGORv Thf S hE DOCaET NuuBEA c i coni l I I L1] Lt._J EbENT CATE REPORT CATE 7 6 7 SS 59 60 101 61 s i 01-1 o f 21 613 68 I 69 1011121 7: 71 74 vi 1o 121o 19 I 7l 7I 75 60  ;

TwEAT DESCRIPTON h

7 8 fl DimTNG P POWER OPERATION Cr b- - :T, W . NO. 3 TIP BALL VALVE FAILED TO l ,

h I r-' ner m'r+= r em-+m ner er , ur - Tt* eye- rw rre mi._-

b0 l 7 89 cur #r nevr errr m r mAve 1 60 I h l VALVE 7-8S INVESTIGATION REVEALED NOTHING: VALVE WAS TAPPED AND IT CLCSED. VALVE WAS l [

ba h }89REPLACED 7 WITH LATEST MODEL WHICH HAS ANTIMPROVED r n N. Tin __ C-CC.R-OPERATOR. j gg i mees.

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47 ce CAUSE DESCRIPTON t bl CAUSE U'! DETERMINED. t 7 89 VALVE WAS DISASSEMBLED INSPECTED AND ForND bJ IN GO 7hl89 VALVE MANUFACTURED FOR GE COMPANY BY CENERAL 4 6054*0J06)PNEUMATICS (C i

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ACTV!TY CONTENT 60 FELEasto OF EELEASE 7 8 9 l_Ej [E.,j l 10 11 NA AuouNT OF ACTurry I I NA LOCAfoN of EtLEASE I

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PERSCNNEL EXPOSURES 60 f NUMBER TYPE DESCR#TCN l 1 l' d ol el Lgj l MA 7 89 11 12 13 '

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HS9 NORTHERN STATES POWER COMPANY u N N E A PO Lt S. MIN N E S OTA 88401 I

February 9, 1977

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Mr J G Keppler, Director, Region III j Office of Inspection & Enforcement U S Nuclear Regulatory Cor:xnission 799 Roosevelt Road clen Ellyn, IL 60137 *

Dear Mr Keppler:

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MONTICELLO NUCLEAR GENEPATING PIANT Docket No. 50-263 License No. DPR-22 No. 3 Tip Ball valve Faiiure To Close The Lice..see Event Report for this ocrurrence is reproduced on the back of this letter. Enclosed ar 3 copies. ,.

Yours very truly, 0 ,.

L 0 Mayer, PE Manager of Nuclear Support Services LOM/MHV/deh ec: Director, IE, USNRC (40) -

Director, MIPC, USNRC (3)

( G Charnoff MPCA At to: J W Ferman \

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