ML20090E313

AO 73-11-20:on 731120,during Routine startup,11 Control Rod Drives Failed to Insert to Position 00 Following High Flux Scram.Caused by Damaged Stop Piston Seals Resulting in Excessive Leakage.Control Rods Will Be Overhauled

ML20090E313
Person / Time
Site:	Nine Mile Point
Issue date:	11/28/1973
From:	Perkins T NIAGARA MOHAWK POWER CORP.
To:	James O'Reilly NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20090E309	List: ML20090E307 ML20090E313
References
AO-73-11-20, NUDOCS 8303140611
Download: ML20090E313 (2)

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TO: J . O 'REILLY Pi:0TOCOP'l  !

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RO: I j ABNORMAL OCCURRENCE 73-11.-20

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- FAtt,U!!P TO Pt.!!.fX INSERT CON'Ih0L R DS ON C SCRAM ON NOVE!GER 20, 1973, AT APPROXn:ATELY 0230 ICRS. A REACIOR RECIRCUTATION

. Pfff.J TRANSIENT OCCURRED RESULTUIG Di A IIIGli FLUX SORAM. TtG REACTOR WAS .

.s OP8t% TING AT 777. POWER AT THIS TI}E. UPON OPERATOR VERIFI('ATION 0Y THIS SCRAM 11- RODS WEPI FOIRID To BE l'031TIONBD AT THE 02 NOTC}l POSITION.

1R8 OPHRA'10K LNtROLATV.tN INSERTED ilESE Rot >S TO 00. SUBSEQUENT TMSTQl0

( STAT,1. LHAl(AGP. Pigl HP,AS!!REMENTS AND SCRAM TUiniG) 0F 'niESE RODS SHOUED 8XCB831VE Fim FAST TH8 S'1TIP PISTON SEALS, WHICU WOULD RESULT ni TliB 00W j j

TROL ROD DRIVE ST/JJU!G DORN DURU1G THE IAST 57. OP f.TS TP.AVEL. TESE .

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- DRIVES R,WE BF,8N SC}EDIJi,P.D FOR OVERifAUL DURING TIE NEXT FIFUBLING 00fACF,,

I^ MARCit, 1974. TIE OPERATOP. VEP.IFIED THAT HBUTRON INSTRtrlGRfATION TNDICATT.D  !

! A liIGlILY SUBCRITICAL REACTOR EVHN WITti TRMSB ROOS AT 02 NOTcil FOSITION, l

Tl!EREFORE 110 !!AEARD WAS PRESEIITED TO TIE GENERAL PUBLIO. Tt!IS EVENT IS I

DBittED AN ABNOFJtAL 00CllRRf!NCf. PER30fNT ~1'O TECICJICAi, fPECIFICATION 1.13d.

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• 6out t h'*. For coacu"*ac'- Fa'*ctioa-Form AEC-93 (Ro. y 84, 8947) AECM 0240 Note and return. For signature. X For informatloe.

TO (Name and un.t) IN811ALS REMAR KS R0 Chief, FS&EB NINE MILE POINT NUCLEAR POWER STATION RO:llQ (5)

RO Files oats DN 50-220 Central }bil & Files Regulatory Standards (3) A0 73-11-20 TO (Name and unit) INTIAL5 REMARKS Directorate of The above abnormal occurrence is forwarded Licensing (13)

Regional Directors, oars for information. Distribution will be made (R0 II, III, IV)

OGC by this office to the PDR, Local PDR, NSIC, TO IName and unit) lhiilALS REMARAS DTIE, and' State representatives.

DATE FRCM (Name and unit) REM ARKS E. J. Brunner Re , ion I ->

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• PHONE NO, DATE 8-337-1246 11/28/73 USE OTHER SIDE FOR ADDITIONAL REMARK $

• CPO e 1,710 - 445-449

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