ML20090L831

Ro:On 780505,steam Leak Noted in RCIC Inlet Steam Line & Drain Line to Condenser.Caused by Pinhole Failure on Weld on 300 Lb Socket Weld.Hole Temporarily Patched

ML20090L831
Person / Time
Site:	Monticello
Issue date:	06/02/1978
From:	Mayer L NORTHERN STATES POWER CO.
To:	James Keppler NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION III)
References
NUDOCS 9102130422
Download: ML20090L831 (3)

Text

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NSP 2EU! I:;fia30]i(ET E COPY NORTHERN 5TATES POWER COMPANY MIN N E A PO bl e. M 4 N N E SOTA 95401 June 2, 19 78 w

!!r J G Keppler Office of Inspection & Enforcement U S Nuclear Regulatory Commission 799 Roosevelt Road Glen Ellyn, IL 60137

Dear !!r Keppler:

MONTICELlD NUCLEAR GENERATING PLANT Docket No. 50-263 License No . DPR-2 2 Steam Leak in RCIC Inlet Steam Line Drain Line The Licensee Event Report for this occurrence is reproduced on the back of this letter. Enclosed are three copies.

This event is reported in compliance with Technical Specification 6.7.B.2.d.

Yours very truly,

$0.byv L 0 Lye r. PE Manage r of Nuclear Support Services LO!!/IIHV/deh cc: Director,1E, USNRC (30)

Director, MIPC, USNRC (3)

MPCA Attn: J W Ferman

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. NRC F ORM 306 U. S. NUCL EOR HIGUL ATORY COMMIS$10N (7771 LICENSEE EVENY REPORY CON 1kOLHLOCN )),l l l 1h (PLE ASE PRINT OR TYPE ALL REOUIRED INFORMAtt0NI l

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W ! A STEAM LEAK WAS OBSERVED AT WELD ON 90 DECPIE ELL IN 1" RCIC STFW1 SUPPLY DRAIN 1

l o 1.i l LPOT DRAIN LINE TO CONDENSER. 'DilS CONSTITITTES AN ABNORmL DEGRADATION OF SYSTEM 1

IrI,1 LDE51GNED 'IU CAR 10' RADICALTIVE St\TERI AL PISULTING FROM FISSION PROCESS (T.S.6.7.B.2.d) .l 1

[ e li.1 1 'Th'O PREVIOllS SIMIIAR OCCllRRENCES (M-RO-77-11 6 15) . _ EVENT llAD NO EFFECT ON SYSTEM

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CAUSE DESCRIPTION AND CORRECHVE ACTIONS h i I.l l PINHOLE FAlltfPI 0F WELD ON 3000 lb. SOCKET hTLD 90 DEGREE ELL OCCllRRFn DUE TO 1 I i j LS"SPECTED C"EVICE CORROSION IN PmR Of fALITY WEl D. CARBON STEEL SCHEDULE 160 PIPE t I i 1 l NOR't\LLY ITNDER VACUUM, LEAKING VAIAT CAUSED PRESSURI" ATION OF UNI)I TliRMINED A'DUNT. 1 i >

i <l l liOLE TEMPORARILY PATOIED PENDING FINAI. REPAIRS DURING APPROPRIATE OIRAGE. SIMIIAR 1 Iii4 1 1 FITTINGS ON 'DlIS LINE WILL BE INSPECTED AND REPLACED IF NECESSARY. I B a 80

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DE LE ASED OF RE LE Att AMOUNT OF ACTIVITY LOC ATION OF RE LE ASE I I l NA l Ii Ic. I LE_J @ LIJ@l NA PE RiO%t iaPO [$

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REGULATORY INFORMATION DISTRIDUTION SYSTEM (RIDS)

DI.TD I PUT I ON FOR INCOMING MATERIAL 50-263 REC: BEPPLER J G ORG: MAYER L 0 DOCDATE: 06/02/78 NRC N STATES PWR DATE RCVD: 06/07/78 DOCTYPE: LETTER NOTARIZED: NO COPIES RECEIVED OUBJECT: LTR I ENCL I FORWARDING LICENSEE EVENT REPT (RO 50-263/78-006) ON 05/05/*3 CONCERNING STEAM LEAK WAS ODSERVED AT WELD ON 90 DEGREE ELL IN 1" RCIC STEAM SUPPLY DRAIN POT DRAIN LINE TO CONDENSER.

PLANT NAME: MONTICELLO REVIEWER INITIAL: XJM DISTRIBUTOR INITIAL:

• • • • • • • • • • • • • • • • • DISTRIBUTION OF THIS MATERIAL IS AS FOLLOWS ******************

INCIDENT REPORTC (DIOTRIrt tTION CODE A002)

FOR ACTION: DR CHIEF ORBH3 BC**W/4 ENCL INTERNAL: NRC POR**W/ ENCL

@EGFILE5dW/ ENCL 4 h i M /2 ENCL MIPC**W/3 ENCL I L C SYSTEMS BR**W/ ENCL EMERGENCY PLAN BR**W/ ENCL NOVAK/ CHECK **W/ ENCL EEB**W/ ENCL AD FOR ENG**W/ ENCL PLANT SYSTEMS DR**W/ ENCL HANAUER**W/ ENCL AU FOR PLANT SYSTEMS **W/ ENCL AD FOR OPER TECH 4*W/ ENCL REACTOR SAFETY BR**W/ ENCL ENGINEERING BR**W/ ENCL VOLLMER/ BUNCH **W/ ENCL KREGER/J. COLLINS **W/ ENCL POWER SYS BR**W/ ENCL K SEYFRIT/IE**W/ ENCL EXTERNAL: LPDR'S MINNEAPOLIS, MN**W/ ENCL TIC **W/ ENCL NSIC**W/ ENCL ACRS CAT D**W/16 ENCL

/

DISTRIDUTION: LTR 45 ENCL 45 CONTROL NBR: 781590170 SIZE: 1P+1P

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