ML20133H674

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Provides Proposed Schedule for Compliance W/Requirements of 10CFR50.62(d) & Generic Ltr 85-06 Re Reduction of Risk from ATWS Events for Light water-cooled Plants & QA Guidance for ATWS Equipment That Is Not safety-related,respectively
ML20133H674
Person / Time
Site: Prairie Island  Xcel Energy icon.png
Issue date: 10/11/1985
From: Musolf D
NORTHERN STATES POWER CO.
To:
Office of Nuclear Reactor Regulation
References
GL-85-06, GL-85-6, NUDOCS 8510180063
Download: ML20133H674 (2)


Text

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. -~ o Nonhem States Power Company 4td Nicchet Ma1

%nneapoks Minnesota 55401 Teephone (612) 330 5500 October 11, 1985 1

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Director Office of Nuclear Reactor Regulation U S Nuclear Regulatory Commission Washington, DC 20555 PRAIRIE ISLAND NUCLEAR GENERATING PIANT Docket Nos. 50-282 License Nos. DPR-42 50-306 DPR-60

Subject:

Schedule for Compliance with 10 CFR Part 50, Section 50.62,

" Requirements for Reduction of Risk from Anticipated Transients Without Scram (ATWS) Events for Light-Water-Cooled Nuclear Power Plants."

Reference:

Letter from H.L. Thompson (NRC) to all reactor power licensees and all applicants for power reactor licenses dated April 16, 1985, " Quality Assurance Guidance for ATWS equipment that is not Safety-Related (Generic Letter 85-06)."

Pursuant to the requirement of 10 CFR Part 50, Section 50.62, paragraph (d),

this letter provides our proposed schedule for meeting the requirements of 10 CFR Part 50, Section 50.62, paragraph (c)(1). The requirements of paragraphs (c)(2) through (c)(5) are not applicable to Prairie Island Nuclear Generating Plant. The referenced letter initiated the 180 day schedule for submittal of this info rmation.

Northern States Power is participating in the Westinghouse Owners Group response to the ATWS issue. Westinghouse has submitted a generic design for ATWS mitigation in WCAP-10858, "AMSAC GENERIC DESIGN PACKAGE" The NRC Staff is currently reviewing the WCAP, and has not issued an Safety Evaluation Report (SER) regarding it. We cannot commit to a final design until an SER has been issued. Our proposed AMSAC installation schedule is contingent upon release of the SER during 1985, and resolution of all open items related to Logic 2 of the generic design.

We presently plan to implement the Westinghouse generic design described in the WCAP as " Logic 2: AMSAC ACTUATION ON LOW FEEDWATER FLOW" The AMSAC (ATWS Mitigating System Actuation Circuitry) system is scheduled for installation in Prairie Island Unit 1 prior to startup of Cycle 12, and in Prairie Island Unit 2 prior to startup of Cycle 12 (presently scheduled for May, 1987 and February, 1988, respectively).

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,- r Director NRR October 11, 1985 Northem States Power Company Page 2 A more specific technical description of Prairie Island's implementation of the generic low feedwater flow logic will be submitted af ter the Westinghouse Owners Group has resolved NRC comments and questions on the generic design.

Please contact us if you have any questions related to the information we have provided.

Mu n David Musolf Manager - Nuclear Support b rvices DMM/EFE c: Regional Administrator-III, NRC

.N"AR Proj ect Manager, NRC Resident Inspector, NRC MPCA Attn: F W Ferman G Charnoff

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