ML17228B067

Informs NRC of Actions That Will Be Taken to Address Impact of Recent Plant Unit 1 Data on Mechanical Plug Corrosion, Per NRC Bulletin 89-001

ML17228B067
Person / Time
Site:	Millstone, Saint Lucie
Issue date:	03/14/1995
From:	Opeka J NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
B15150, IEB-89-001, IEB-89-1, NUDOCS 9503210453
Download: ML17228B067 (4)

Text

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REGULATORY INFORMATION DISTRIBUTION SYSTEM (RIDS)

ACCESSION NBR:9503210453 DOC.DATE: 95/03/14 NOTARIZED: NO DOCKET FACIL:50-335 St. Lucie Plant, Unit 1, Florida Power & Light,Co. 05000335 50-423 Millstone Nuclear Power Station, Unit 3, Northeast Nu 05000423 AUTH. NAME AUTHOR AFFILIATION OPEKA,J.F. , Northeast Nuclear Energy Co.

RECIP.NAME RECIPIENT AFFILIATION Document Control Branch (Document Control Desk)

SUBJECT:

Informs NRC of actions that of recent plant Unit 1 data will be taken to address impact on mechanical plug corrosion as DISTRIBUTION CODE: IESID COPIES RECEIVED:LTR ENCL 0 SIZE:

TITLE: Bulletin Response 89-01 re Failure of Westinghouse Steam Gen. Mec . T NOTES:

RECIPIENT COPIES RECIPIENT COPIES ID CODE/NAME LTTR ENCL ID CODE/NAME LTTR ENCL NRR/PD2-2 PD2-2 PD PD1-3 PD NORRIS,J GRIGGS,M INTERNAL: AEOD/DOA 1 FILE CENTE 02 NRR/DE/EMCB 1 NRR/DE/EMEB NRR/DOPS/OGCB 1 NRR/DSSA RES/DSIR/EIB 1 RGN1 FILE 01 RGN2 FILE 01 1 EXTERNAL: NOAC NRC PDR NOTE TOALL RIDS RECIPIENTS:

PLEASE HELP US TO REDUCE iVASTE! CONTACT THE DOCUMENT CONTROL DESK, ROOM Pl-37 (EXT. 504-2083 ) TO ELIMINIATEYOUR NAME FROM DISTRIBUTION LISTS FOR DOCUMENTS YOU DON"I'EED!

TOTAL NUMBER OF COPIES REQUIRED'TTR 16 ENCL

10 'elden Street, Berlin, Cf 06037 Ufiliiies System Northeast Utilities Service Company P.O. Boz 270 Hartford, CT 06141-0270 (203) 665-5000 March 14, 1995 Docket No. 50-423 B15150 Re: NRC Bulletin No. 89-01 U.S. Nuclear Regulatory Commission Attention: Document Control Desk Washington, DC 20555 Millstone Nuclear Power Station, Unit No. 3 Failure of We tin h e S e m Generator T b M chanical Plu s The purpose of this letter is for Northeast Nuclear Energy Company (NNECO) to inform the NRC Staff of the actions that will be taken to address the impact of the recent St. Lucie Unit 1 data on mechanical plug corrosion as it pertains to Millstone Unit No. 3.

On December 22, 1994, the Westinghouse Owners Group met with the NRC Staff to address the impact of the recent St. Lucie data on the mechanical tube plug action plan. At the end of the meeting, the NRC Staff requested that each licensee provide a letter to the NRC addressing four items. NNECO hereby provides a response to each of the four items:

stion 1: Identify the number of Westinghouse mechanical plugs manufactured from Alloy 600TT material present in your steam generators that have not been either changed out or replaced.

R s onse 1: To date, three mechanical plugs in the hot leg and eleven mechanical plugs in the cold leg of the Millstone Unit No. 3 steam generators have not been either changed out or replaced.

uestion 2: Reaffirmation that operation of your plant with the identified plugs does not represent a safety issue.

This should be based on your previous response to NRC Bulletin 89-01 and its supplements.

Res onse 2: NNECO believes that the recent events, the algorithm revisions notwithstanding, do not change the technical basis for the prior action plan addressing mechanical plug corrosion. The justification for continued operation provided in WCAP-12444 for steam generator tube plugs continues to apply.

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0 U.S. Nuclear Regulatory Commission B15150/Page 2 March 14, 1995 uestion 3: A commitment to evaluate and assess the impact of the Addendum 3 to WCAP-12444, to be issued by Westinghouse by January 31, 1995, on your existing action plan for addressing mechanical plug corrosion provided to the NRC in response to NRC Bulletin 89-01 and its supplements.

Res ons 3: NNECO will be evaluating the impact of Addendum 3 to WCAP.-12444 on our existing action plan for addressing mechanical plug corrosion provided in our letter dated July 30, 1991.'"

uesti n 4: A commitment to issue to the NRC a schedule and revised action plan for your plant in addressing this issue 30 days prior to your next scheduled to begin outage.

Re onse 4: As stated in our letter dated July 30, 1991, the remaining three mechanical plugs (heat 4 NX2387) in the hot leg of the Millstone Unit No. 3 steam generators are scheduled for repair during the upcoming refueling outage currently scheduled to start in April 1995. No cold leg mechanical plugs are presently expected to require repair.

If you should have any questions on the information provided herein, please contact Mr. R. G. Joshi at (203) 440-2080.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY J. F. e a Executive Vice President cc: T. T. Martin, Region I Administrator V. L. Rooney, NRC Project Manager, Millstone Unit No. 3 P. D. Swetland, Senior Resident Inspector, Millstone Unit Nos 1, 2, and 3

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(1) E. J. Mroczka letter to the U.S. Nuclear Regulatory Commission, "Haddam Neck Plant, Millstone Nuclear Power Station, Unit Nos 2 and 3, NRC Bulletin No. 89-01, Supplement

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2, Failure of Westinghouse Steam Generator Tube Mechanical Plugs" dated July 30, 1991.