ML20058K694

Ler:On 750505,control Circuit for RCIC Turbine Steam Supply Valve Discovered Deenergized Due to Open Undervoltage Relay Coil.Affected Part Replaced in Kind

ML20058K694
Person / Time
Site:	Monticello
Issue date:	05/15/1975
From:	Day B, Mayer L NORTHERN STATES POWER CO.
To:	Giambusso A NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
LER-LER-750515, NUDOCS 9102130483
Download: ML20058K694 (2)

Text

LICENSEE EVENT REPORT CONTROL BLOCK l l l l l l l (pLEASE PRINT ALL REQUIRED INFO! MOTION) 1 6 i[hi UCE Nit NUVBfC vr1E T FE h lM lN l Ml Nl Pl 1} l0 l0 l-l 0l 0l 0l Ol0 l-l 0 l 0 l l 4l 1 l1l 1l 1l l 0l 1l 7 89 14 15 25 26 30 31 32 DOCLET NUVBEP E VE NT DATE REPOQT DATE C AT E GDP' ?P S h CONT lp h l l Tl lL l l0 !5 lO!- ! O! 2l 64 3l l0 l5 l0 l 5 l 7l 5l l 0l511 l5 l 7 l 5 l 7 6 57 SS 59 60 61 68 09 74 75 80 EVENT DESCRIPTION O l DPPTNr NrvyAt OPrvATTON CONTR0T CIRCUIT FOR FCIC TURBINE STEAM SUPPT.Y VALVE MO 2078 l 7 89 80 HPCI AVAIIABLE AND l

$ l DISCOVERED DEE' ERCTZED DUE TO OPE': UNDERVOLTAGE REIAY COIL. 80 7 89 0 lnurpf.yTrAm Twr nr nrrrroNrF TWO PPr"1OUS SIMLAR OCCURRE!CES "0T REPORTABLE. l 7 89 80 M l AFFECTED PART REPLACED IN RIND. A0 263/75-08. l 7 89 80 hl 7 89 pau; 80 l

S YSTE M CAUSE COMPONENT CouPONENT CODE CODE COMPONENT CCDE SUPPL E E VANUFACTUREA voLATON O l rlr l l rl l R l B l Ll Al Yl X l lAl l Gl Ol 810l 47 l Yl 7 89 10 11 12 17 43 44 48 CAUSE DESCAlPTION O l A GE7 ERAT FT ECTRIC MODEL 393B20962 250/275 VDC l'NDERVOLTAGE RELAY COIL OPE' ED l 7 89 80 E l CAUSING RET.AY TO DROP OUT AND DEENERCIZE MOTOR CONTROL CIRCUIT. INVESTIGATION OF l 7 89 80 10 l CAPSE OF COIT FATLURE CO'!TINUES SO THAT RDIEDIAL ACTI ONS MAY BE DETERMINED. l 7 89 80 FACtiv METHOD OF ETATUS  % POWE A OTHEA STAvUS D!SCOVE A* DrSCOVE RY DE scars'T ION 3 W l1 l 0l 0 l l N/A l lBl l N/A 80 l

7 8 9 10 12 13 44 45 46 ACirvriv CONT E NT AELEASED OF AELEASE AMOUNT C5 ACTVT v LOCATION CF AELE ASE 12 l Zl d lN/A l l N/A l 7 8 9 10 11 44 45 80 r r

PERSONNEL EXPOSURES i NUMBE A T Y PE DESCATPTION f

l W l 0l0 l 0 l 12d 7 89 11 lN/A 13 80 l

l PERSONNEL INJURIES NuvBE R DE SC A1PTION l

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I, OFFSITE CONSEQUENCES gg l N/A [

7 89 80 l4 LOSS OR DAMAGE TO FACILITY j

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PUBLICITY 1 lN/A l 7 89 9102130483 750515 Bo CF ADOCK 05000263 4

ADDITIONAL FACTORS CF 1B l N/A l 7 89 80 l

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NAME; BYRON D. DA. pggy, . 612/295-5151 f.P 0 est.ss?

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May 15, 1975 "

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Mr.

Giambusso, Director '

Division of Reactor Licensing U. S. Nuclear Regulatory Co=nission '~ ~

Washington, D. C. 20555

Dear Mr. Giambusso:

MONTICELLO NUCLEAR GE"ERATING PLANT Docket No. 50-263 License No. DPR-22 Licensee Event Report to the NRC Inoperable RCIC Steam Supply Valve The Licensee Event Report for this occurrence is reproduced on the back of this letter.

Yours very truly, M A' l L. O. Mayer, PE Manager, Nuclear Support Services cc: J. G. Kepper G. Charnof f Minnesota Pollution Control Agency Attn: E. A. Pryzina r'og U

-over-

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