ML20214N746

Summary of 860828 Meeting W/Util in Bethesda,Md Re Fire Protection Issues.List of Attendees Encl

ML20214N746
Person / Time
Site:	Millstone
Issue date:	09/11/1986
From:	Jaffe D Office of Nuclear Reactor Regulation
To:	Office of Nuclear Reactor Regulation
References
NUDOCS 8609170007
Download: ML20214N746 (5)

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SEP 11 E06 Docket No. 50-336 LICENSEE: Northeast Nuclear Energy Company, (NNEC), et.al FACILITY: Millstone Nuclear Power Station, Units 1 and 2

SUMMARY

OF AUGUST 28, 1986 MEETING WITH THE LICENSEE AND NRC STAFF REGARDING FIRE PROTECTION On August 28, 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 Units 1 and 2. A list of attendees is enclosed. A summary of the discussions is as follows:

1. Protection of Steel Beams - Diesel Generator Areas:

The licensee indicated that a structural analysis was underway to assess the consequences of the failure of certain steel beams in the diesel generator rooms, resulting from a fire. If the the beams are required to be protected to assure their structural integrity, the licensee is proposing to use a modified sprinkler system in lieu of conventional "fireproofing." Fireproofing is not feasible because of obstructions near the ceiling.

The sprinkler system proposed by the licensee.would be of a pre-action-type, using rate-of-rise fire detectors and utilizing sprinkler heads which are located to provide protection from a diesel oil exposure fire. Sprinkler heads, located so as to discharge water

, onto the exposed steel beams, would also be used. The system would be designed to provide .25 GPM/sq. ft. over the floor and .1 GPM/sq. ft.

over the exposed steel, with all sprinkler. heads flowing in any one diesel generator room. The staff indicated that this level of protection was consistent with previously accepted design concepts, subject to implementation of the design as discussed and demon-stration (via sprinkler head discharge characteristics) that water would be sprayed over the length of the exposed steel beam. The staff also suggested that the licensee discuss this design concept l with the Region I fire protection engineer.

2. Protection of Structural Steel - Other Locations:

For other locations where steel columns and beams were not protected against the effects of a fire, the licensee proposed to use a fire hazards analysis which relates the overage fire loading in an area t

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to the resulting temperature on the ASTM E-119 time-temperature curve. If the temperature on the curve exceeded 1100 F, steel would be protected. The staff responded that this method alone was unacceptable because it would ignore the hazard associated with localized areas containing concentrated quantities of combustible materials. If structural steel subject to such " hot spots" was protected, then the analytical approach described above is consistent with previous staff approvals. The staff made it clear that unless adequate justification was provided, structural steel is required to be protected whenever part of, or framed into, any fire barrier necessary to satisfy staff fire protection requirements and s guidelines (Appendix R to 10 CFR Part 50 and Appendix A to BTP APCSB 9.5-1).

3. ' Water Curtain Between Areas A-13 and A-18:

The licensee described a proposed water curtain to compensate for an unprotected wall opening. The staff indicated that, subject to the installation of an adequate draft curtain, the proposed system was consistent with previously approved configurations.

4. Water Curtain Between Areas A-2 and A-7:

The licensee indicated that a previously proposed water curtain would not be installed. Instead, one division of shutdown cables would be enclosed in a 3-hour fire-related cable wrap and that automatic sprinkler protection would be installed to protect MCC-B-61. The staff indicated that this design is consistent with previously approved configurations.

The staff requested a status report on the revised Appendix R compliance reports for Units 1 and 2. The licensee responded that the reports for both units were "in-house" for review and comment. The-licensee indicated that the Millstone 1 report would be submitted to the staff in early November and the report for Unit 2 would be submitted shortly thereafter. The staff reiterated the need for a timely submittal to enable a safety evaluation to be prepared prior to the upcoming Appendix R audits - now scheduled for February /

March 1987.

The licensee stated that the Millstone 2 submittal will contain seven new exemption requests. In addition, a new exemption will be submitted for Unit 1, related to the Dresden drywell expansion gap fire.

M D. H. Jaffe, Project Manager PWR Project Directorate #8 Division of PWR Licensing-B

Enclosure:

List of Attendees '

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Mr. John F. Opeka Millstone Nuclear Power Station H

Northeast Nuclear Energy Company Unit No. 2 cc:

Gerald Garfield, Esq. Mr. Wayne D. Romberg Day, Berry & Howard Superintendent Counselors at Law Millstone Nuclear Power Station City Place P. O. Box 128 Hartford, Connecticut 06103-3499 Waterford, Connecticut 06385 Regional Administrator, Region I Mr. Edward J. Mroczka U.S. Nuclear Regulatory Commission Vice President, Nuclear Operations Office of Executive Director for Northeast Nuclear Energy Company Operations P. O. Box 270 631 Park Avenue Hartford, Connecticut 06141-0270 King of Prussia, Pennsylvania 19406 Mr. John F. Opeka, Senior Vice President Mr. Charles Brinkman, Manager Nuclear Engineering and Operations Washington Nuclear Operations Northeast Nuclear Energy Company C-E Power Systems P. O. Box 270 Combustion Engineering, Inc. Hartford, CT 06141-0270 7910 Woodmont Avenue Bethesda, Maryland 20814 Mr. Lawrence Bettencourt, First Selectman Town of Waterford Hall of Records - 200 Boston Post Road

'c?.erford,

. Connecticut 06385 Northeast Utilities Service Company ATTN: Mr. Richard R. Laudenat, Manager Generation Facilities Licensing Post Office Box 270 Hartford, Connecticut 06141-0270 Kevin McCarthy, Director Radiation Control Unit Department of Environmental Protection State Office Building Hartford, Connecticut 06106 Mr. Theodore Rebelowski U.S. NRC P. O. Box 615 Waterford, Connecticut 06385-0615 Office of Policy & Management l ATTN: Under Secretary Energy l Division 80 Washington Street l Hartford, Connecticut 06106 l

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g Enclosure '

List of Attendees NRC NNEC D. Kubicki J. Naylor D. Jaffe 1. Patrizz J. Van Noordenn l

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MEETING

SUMMARY

DISTRIBUTION Licensee: Northeast Nuclear Energy Company mDecket,LFne: 4 N PDR: ~' '

Local PDR PBD8 Reading.

F. Miraglia D. Jaffe OGC-Bethesda E. Jordan -

B. Grimes ACRS (10)

Gray File 3.Sc- -

NRC Participants D. Kubicki i

cc: Licensee and Plant Service List

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