ML20204B766

Responds to NRC 870212 Request for Addl Info Re Implementation Schedule for Compliance W/Requirements of ATWS rule,10CFR50.62.Mods Will Be Completed by End of Cycle 10 Refueling Outage Scheduled to Begin in June 1989

ML20204B766
Person / Time
Site:	Millstone
Issue date:	03/19/1987
From:	Mroczka E NORTHEAST NUCLEAR ENERGY CO., NORTHEAST UTILITIES
To:	NRC OFFICE OF INFORMATION RESOURCES MANAGEMENT (IRM)
References
A06368, A6368, GL-85-06, GL-85-6, TAC-59114, NUDOCS 8703250145
Download: ML20204B766 (3)

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General Offices

• Selden Street, Berlin. Connecticut usnY 's sc=c cow P.O. box 270

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, (203) 665-5000 March 19, 1987 Docket No. 50-336 A06368 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 Implementation Schedule for ATWS Rule In a letter dated February 12, 1987(*', the NRC Staff provided Northeast Nuclear Energy Company (NNECO) with additional information with respect to implementation schedules for compliance with the requirements of the ATWS rule, 10 CFR 50.62.

In addition, the Staff requested that NNECO provide the Staff a schedule for the specific implementation of ATWS required plant modifications using the guidance provided in Reference (1). The Staff requested that this information be provided within thirty (30) days of receipt of Reference (1). Accordingly, NNECO is hereby providing the requested information regarding the schedule for implementation of the ATWS rule at Millstone Unit No. 2.

In a letter dated October 11, 1985, NNECO responded to Generic Letter 85-06 and documented the design cf those modifications being proposed by NNECO to address the requirements of 10 CFR 50.62 for Millstone Unit No.2. Included with Reference (2) was a schedule for implementation for these modifications. At that time NNECO proposed to perform the proposed modifications with the intention of being in full compliance with 10 CFR 50.62 at Millstone Unit No. 2 by the end of the refueling outage scheduled to start in January, 1988. However, NNECO stated that implementation of the described ATWS related plant modifications was contingent upon receipt of NRC Staff concurrence with NNECO's

1) D.H.Jaffe letter to E.J.Mroczka, " Millstone Unit 2 Schedule for Implementation of the ATWS Rule", dated February 12, 1987.

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

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U.S. Nuclear Regulatory Commission A06368/Page 2 March 19, 1987 approach by March 1, 1986.

It is the understanding of NNECO that the NRC Staff has completed their review of the Combustion Engineering generic response to the ATWS rule. Based on this fact and the request of the Staff in Reference (1), NNECO has decided to proceed with the completion of design and installation of appropriate modifications to bring Millstone Unit No. 2 into full compliance with the technical requirements of 10 CFR 50.62. NNECO will review our proposed design of modifications with respect to the Staff approved CE generic design. By April 30, 1987, NNECO will submit to the NRC Staff an updated description of the design of modifications intended to bring Millstone Unit No. 2 into conformance with 10 CFR 50.62.

With respect to schedule, Reference (1) stated that the NRC Staff had decided to extend the deadline for implementation of the ATWS rule. The revised schedule allows licensees to delay implementation of the ATWS rule requirements to no later than the third refueling outage after July 26, 1984. For Millstone Unit No. 2 this would coincide with the commitment date proposed by NNECO in Reference (2), the January 1988 refueling outage.

As stated earlier, NNECO intends to evaluate the NRC Staff Safety Evaluation of the CE generic response to the ATWS rule and consider whether er not any changes to the design as described in Reference (2) are prudent. Due to the shortness of the current operating cycle, the lead times for procurring the equipment needed and the time required for engineering and design, NNECO would not be able to achieve implementation within the date prescribed in Reference (1). Therefore, NNECO hereby commits to

' perform all necessary modifications to bring Millstone Unit No. 2 into conformance with 10 CFR 50.62 by the end of the Cycle 10 refueling outage currently scheduled to begin in June, 1989.

As stated above, Reference (2) specified that implementation of the described ATWS related plant modificatons was contingent upon receipt of NRC Staff concurrence with NNECO's proposed design.

The approach outlined in this letter, resulting in the end of Cycle 10 refueling outage implementation date, is consistent with the position taken by NNECO in Reference (2).

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U.S. Nuclear Regulatory Commission A06368/Page.3 March 19, 1987 In order ~ to . achieve our schedule, NNECO respectfully requests that the NRC Staff review our proposed design and respond to NNECO with comments no later that September.1, 1987. Significant Staff concerns that are raised to NNECO after this date have the potential to impact the implementation schedule as proposed above.

We trust that you will find the above l'nformation satisfactory.

Very truly yours, NORTHEAST NUCLEAR ENERGY COMPANY M fc/

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Senior Vice President cc: Dr. T.E.Murley, Region I Administrator D.H.Jaffe,NRC Project Manager, Millstone Unit No. 2 T.Rebelowski, Resident Inspector, Millstone Unit Nos. 1 and 2

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