ML17325B464

Withdraws Response to Issue 1 of NRC Cal,Dtd 970919. Comprehensive Design Review Effort in Progress to Validate Resolution of Issue for Future Operation

ML17325B464
Person / Time
Site:	Cook
Issue date:	03/17/1999
From:	RENCHECK M W INDIANA MICHIGAN POWER CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
AEP:NRC:-1260GQ, NUDOCS 9903240377
Download: ML17325B464 (6)

Text

Cg CATEGORY 1.REGULATE INFORMATION DISTRIBUTION SYSTEM (RIDS)ACCESSION NBR:9903240377

'OC.DATE: 99/03/17 NOTARIZED:

NO FACIL:50-315 Donald C.Cook Nuclear Power Plant, Unit 1, Indiana M 50-.316 Donald C.Cook Nuclear Power Plant, Unit 2, Indiana'AUTH.NAME AUTHOR AFFILIATION RENCHECK,M.W.

Indiana Michigan Power Co.RECIP.NAME RECIPIENT"AFFILIATION Records Management Branch (Document Control Desk)DOCKET 05000315 05000316

SUBJECT:

Withdraws response to issue 1 of NRC CAL,dtd 970919.Comprehensive design review effort in progress to validate resolution of issue for future operation.

DISTRIBUTION CODE IE36D COPIES RECEIVED:LTR L ENCL D SIZE: TITLE: Immediate/Confirmatory Action Ltr (50 Dkt-Other Than Emergency NOTES: Prepar RECIPIENT ID CODE/NAME PD XNTERNA.FIL RES/DET/EIB EXTERNAL: NOACPM NRR/DRPM/PECB NRC PDR COPIES RECIPIENT LTTR EfCL ID CODE/NAME 1 COPIES LTTR E CL D N NOTE TO ALL NRZDSN RECIPIENTS PLEASE HELP US TO REDUCE WASTE.TO HAVE YOUR NAME OR ORGANIZATION REMOVED FROM DISTRIBUTION LISTS OR REDUCE THE NUMBER OF COP I ES RECE I VED BY YOU OR YOUR ORGANZ ZAT I ON i CONTACT THE DOCUMENT CONTROL DESK (DCD)ON EXTENSION 415-2083 TOTAL NUMBER OF COPIES REQUIRED: LTTR 7 ENCL Indiana Michigan~Power Company 500 Circle Drive Buchanan, Ml 491071373 INQIANA MICHIGAN FOWM March 17, 1999 AEP:NRC: 1260GQ Docket Nos: 50-315 50-316 U.S.Nuclear Regulatory Commission ATTN: Document Control Desk Mail Stop 0-Pl-17 Washington, DC 20555-0001 Donald C.Cook Nuclear Plant Units 1&2 WITHDRAWAL OF RESPONSE TO ISSUE NO.1 OF THE NRC CONFIRMATORY ACTION LETTER OF SEPTEMBER 19'997~RIII 97 011

Reference:

AEP:NRC:1260G3, Response to Confirmatory Action Letter dated December 2, 1997 Indiana and Michigan Power Company (I&M)provided our responses to the subject NRC Confirmatory Action Letter (CAL)as delineated in the reference.

In a'ecent review associated with our restart efforts, I&M identified potential non-conservatisms related to the assumptions used in our previous containment sump analysis provided in response to CAL Issue 1 in Attachment 2 to the reference letter.Adjusting'these earlier assumptions produced lower predicted ice melt rates, which could potentially result in predicted sump levels below the design basis minimum level for certain small-break LOCA cases.Therefore, I&M withdraws our response to CAL Issue No.l.In order to address the containment sump inventory issue, a comprehensive design review effort is in progress to validate resolution of this issue for future operation.

This design review will ensure resolution of the sump issue as part of the restart plan.Additionally, I&M will review our responses to the CAL letter to ensure they remain'valid in consideration of findings that may emerge from the'Expanded System Readiness Reviews.'903240377 9903i7 POR AOOCK OS0003LS PDR.~gQ3 p4 U.S.Nuclear Regulatory Commission Page 2 I AEP:NRC:1260GQ If you have any questions or wish to discuss this matter further please contact David F.Kunsemiller at 616-466-2405.

Sincerely, Michael W.Rencheck Vice President-Nuclear Engineering c J.A.Abramson A.C.Bakken," J.E.Dyer, MDBQ-DW&RPD NRC Resident 1nspector,',

I~S h I I I'k~f hf

~+(g>~~r r~U.S.Nuclear Regulatory Commission Page 3 AEP: NRC: 1260GQ bc: T.P.Beilman J.M.Chamberlain J.J.Euto FOLIO B.J.Hickle G.Honma D.F.Kunsemiller/G.

P.Arent/M.J.Gumns M.W.Rencheck/E.

R.Eckstein/D.

J.Garner J.F.Stang, Jr., NRC Washington, DC

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