ML20207A778

Summary of 861023 Meeting W/Util in Bethesda,Md Re Fire protection-related Issues,Including Separation of Redundant Shutdown Sys in Drywell Expansion Gap

ML20207A778
Person / Time
Site:	Millstone, Haddam Neck, 05000000
Issue date:	11/05/1986
From:	James Shea Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8611110289
Download: ML20207A778 (5)

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% +o November 5,1986 Docket No. 50-245/213 LICENSEE: Northeast Nuclear Energy Company, (NNECO), et.al FACILITY: Millstone Nuclear Power Station, Unit I and Haddam Neck Plant

SUMMARY

OF OCTOBER 23, 1986 NEETING WITH THE LICENSEE AND NRC STAFF REGAPDING FIRE PROTECTION On October 23, 1986, the staff met with representatives of the licensee in Room P-114 of the Phillips Building, Bethesda, Maryland. The purpose of the meeting was to discuss a number of fire protection related issues concerning Millstone summary'bf UnittheI and HaddamisNeck.

discussions A list of attendees is enclosed. A as follows:

1. The licensee discussed two draft requests for' exemption from the technical requirements of Appendix R to 10 CFR 50 for Millstone, Unit 1:

a. separation of redundant shutdown systems in the drywell expansion gap; and

b. separation of redundant instrument racks on elevation 42'-6" of the reactor building.

The staff indicated that in order to evaluate the exemption in the reactor building on elevation 42'-6" the licensee should provide clarification regarding the adequacy of the fire detection system. Specifically, the licensee should indicate the extent of detector coverage, as well as system conformance to applicable National Fire Protection Association (NFPA) codes.

In addition, the staff requested clarification regarding technical specification surveillance of the steel enclosure around instrument rack No. 2205.

No additional infomation was necessary for the drywell expansion gap exemption request.

2. The licensee made a suggestion to clarify the proposed Halon gas design concentration for the fire suppression system in the Unit 1 control room. The proposal was to stipulate that the design concentration would be 7% Halon gas but that the system would be accepted if not less than 5% concentration was maintained for the required 10 minutes, e611110289 PDR ADOCK $ bbN PDR 13 F

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The staff explained that it could not accept this proposal because it would be inconsistent with the design philosophy employed in the Haddam Neck control room, as well as at other power plant systems that have installed Halon fire suppression systems. A 5% design concentration is considered acceptable for " surface burning" type fires, such as a flammable liquid spill fire. A 10% Halon concentration is considered acceptable for

" deep seated" fires, such as with certain types of Class A combustibles.

The staff believes that because of the nature of the fire hazard in control room, as well as in certain other areas typical of a power plant, the con-centration should be considered to be between these two extremes. As a result, it was concluded that a 7% Halon gas concentration must be main-tained for the 10 minute required " soak time" in these areas.

3. The licensee discussed a proposed fire hazards analysis to justify the lack of a standard fire rating on the common wall between the control room and ccmputer room at Haddam Neck. The staff indicated that because the areas on both sides of the wall are protected by automatic fire suppression systems, this wall configuration is not significantly different from other non-fire-rated features that have been previously approved. The staff made a commitment to review the draft analyses and to inform the licensee of any additional information required to be included in a docketed submittal.

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Janies J. Shea, Project Manager Integrated Safety Assessment Project Directorate Division of PWR Licensing - B cc: See Next Page

. Novemb:r 5,1986 The staff explained that it could not accept this proposal because it would be inconsistent with the design philosophy employed in the Haddam Neck control room, as well as at other power plant systems that have installed Halon fire suppression systems. A 5% design concentration is considered acceptable for " surface burning" type fires, such as a flamable liquid cpill fire. A 10% Halon concentration is considered acceptable for

" deep seated" fires, such as with certain types of Class A combustibles.

The staff believes that because of the nature of the fire hazard in control room, as well as in certain other areas typical of a power plant, the con-centration should be considered to be between these two extremes. As a result, it was concluded that a 7% Halon gas concentration must be main-tained for the 10 minute required " soak time" in these areas.

3. The licensee discussed a proposed fire hazards ana'.ysis to justify the lack of a standard fire rating on the comon wall between the control room and computer room at Haddam Neck. The staff indicated that because the areas on both sides of the wall are protected by automatic fire suppression systems, this wall configuration is not significantly different from other non-fire-rated features that have been previously approved. The staff made a commitment to review the draft analyses and to inform the licensee of any additional information required to be included in a docketed submittal.

Original signed by: James Shea James J. Shea, Project Manager Integrated Safety Assessment Project Directorate Division of PWR Licensing - B cc: See Next Page DISTRIBUTION QW3 NRC PDR Local PDR ISAP Reading F. Miraglia J. Shea 0GC-Bethesda E. Jordan B. Grimes ACRS (10)

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Mr. John F. Opeka Millstone Nuclear Power Station Northeast Nuclear Energy Company Unit No. I cc:

Gerald Garfield, Esquire Kevin McCarthy, Director Day, Berry & Howard Radiation Control Unit Counselors at Law Department of Environmental City Place . Protection Hartford, Connecticut 06103-3499 State Office Building Hartford, Connecticut 06106 Edward J. Mroczka Vice President, Nuclear Operations Richard M. Kacich, Supervisor Northeast Utilities Service Company Operating Nuclear Plant Licensing Post Office Box 270 Northeast Utilities Service Company Hartford, Connecticut 06141-0270 Post Office Box 270 Hartford, Connecticut 06141-0270 1 State of Connecticut Office of Policy and Management ATTN: Under Secretary Energy Division j 80 Washington Street Hartford, Connecticut 06106 Regional Administrator, Region I U.S. Nuclear Regulatory Commission 631 Park Avenue King of Prussia, Pennsylvania 19406 Northeast Nuclear Energy Company ATTN: Superintendent Millstone Nuclear Power Station P. O. Box 128 Waterford, Connecticut 06385 Resident Inspector c/o U.S. NRC Millstone Nuclear Power Station 4

P. O. Box 811

! Niantic, Connecticut 06357 First Selectman of the Town of Waterford Hall of Records 200 Boston Post Road Waterford, Connecticut 06385 i

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, Enclosure List of Attendees NRC NNECO D. Kubicki J. Naylor J. Shea T. Patrizz I. Ahmed J. Van Noordennen ,

C. Grimes R. Halleck F. Akstulewicz B. Pohora i

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