ML20210A244

Reconfirms 851011 Proposed Design Mods to Address 10CFR50.62 Requirements,Per 870319 Commitment to Reevaluate Design.Mods Will Be Installed by Cycle 10 Refueling Outage in June 1989. Review of Mods Requested by 870901

ML20210A244
Person / Time
Site:	Millstone
Issue date:	05/01/1987
From:	Mroczka E, Werner R NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	NRC OFFICE OF ADMINISTRATION & RESOURCES MANAGEMENT (ARM)
References
AO6368, TAC-59114, NUDOCS 8705050043
Download: ML20210A244 (2)

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General offices

• Selden Street, Berlin, Connecticut P.O. Box 270 g a .I[,,7.".'. ~,, "" HARTFORD CONNECTICUT 06141-0270 awar iuma ranaov-= (203) 665-5000 May 1, 1987 Docket No. 50-336 AO6368 Re: 10 CFR 50.62 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555 Gentlemen:

Millstone Nuclear Power Station, Unit No. 2 ATWS Rule, 10 CFR 50.62 In a letter dated March 19, 1987(1) , Northeast Nuclear Energy Company (NNECO) provided the NRC Staff with additional information with regard to the schedule for implementation of the ATWS rule, 10 CFR 50.62, at Millstone Unit No. 2. In addition, Reference (1) stated that NNECO would be re-evaluating the design of those modifications being proposed to address the requirements of10CFR50.62atMillgoneUnitNo.2,asdescribedinaletter dated October 11, 1985' NNECO stated that by April 30, 1987, we would inform the Staff of the results of that re-evaluation.

Accordingly, NNECO has reviewed our proposed modifications as outlined in Reference (2) and have decided to reconfirm our design as described in that letter. As stated in Reference (1),

NNECO intends to proceed with the installation of these modifications with the expectation of bringing Millstone Unit No.

2 into full compliance with 10 CFR 50.62 by the end of the Cycle 10 refueling outage currently scheduled to begin in June, 1989.

As such, Reference (1) requested that the NRC Staff complete their review of our proposed design and respond to NNECO with any comments no later than September 1, 1987. This will help to ensure that the implementation schedule as proposed above will l not be adversely impacted.

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1) E.J.Mroczka letter to U.S. Nuclear Regulatory Commission, dated March 19, 1987," Implementation Schedule for ATWS Rule".

2) J.F.Opeka letter to E.J. Butcher and J.A.Zwolinski, dated October 11, 1985,"ATWS Rule Schedule Required by 10 CFR 50.62(d)".

8705050043 870501 0 DR ADOCK 0500 6 i g

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U.S. Nuclear Regulatory Commission A06368/Page 2 May 1, 1987

] If you have any questions, please contact us.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY W tcc ~

E.J.Mr zka O Senior Vice President n-By: R.P.Werner Vice President cc: W.T. Russell, Region I Administrator D.H.Jaffe,NRC Project Manager, Millstone Unit No. 2 T.Rebelowski, Resident Inspector, Millstone Unit Nos. I and 2

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