ML20133D248

Discusses Coating of Steel Beam Surfaces W/Qualified Fireproof Matl,Per Section III.G.2 of App R Requirement for Structural Steel Forming or Supporting Fire Barriers Separating Equipment Trains

ML20133D248
Person / Time
Site:	Beaver Valley
Issue date:	07/10/1985
From:	Carey J DUQUESNE LIGHT CO.
To:	Varga S Office of Nuclear Reactor Regulation
References
NUDOCS 8507220145
Download: ML20133D248 (8)

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'Af Telephone (412) 393-6000 Nuclear Group P.O. Box 4 Shippingport, PA 15077-0004 July 10, 1985 ilirector of Nuclear Reactor Regulation United States Nuclear Regulatory Commission Attn: Mr. Steven A. Varga, Chief Operating Reactors Branch No. 1 Division of Licensing Washington, DC 20555

Reference:

Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 Appendix R - Fire Protection Gentlemen:

By letter dated December 16, 1983, we requested additional exemptions from the requirements of Appendix R to 10CFR Part 50. The requested ex-emptions were all granted per your letter of August 30, 1984 with the excep-tion of the one request concerning structural steel. Your letter indicated that action had been deferred because this particular issue on structural steel was a " generic" issue.

Section III.G.2(a) of Appendix R requires structural steel forming a part of or supporting fire barriers separating redundant trains shall be protected to provide fire resistance equivalent to that required of the barrier. The area in question is the Service Building, Elevation 713 area below the Cable Spreading Room. This area encompasses the following separate fire areas where the structural steel is located:

West Emergency Switchgear Room (ES-1)

East Emergency Switchgear Room (ES-2)

Motor Generator Room (MG-1)

Process Instrumert Room (CR-4)

Relay Room (CR-3)

HVAC Equipment Room (G-2), pump area portion Our January 14, 1985 letter indicated furt'ier review and analysis was being conducted to resolve this issue. An independent analysis was conducted and completed in May of this year. Based on the results of this independent analysis and the recent phone conversation with rambers of your staff, we have reviewed the following options:

1. Redefining fire area boundaries, and

2. Coating the structural steel beam members Redefining fire area boundaries was determined to be unfeasible. We have concluded that the prudent course of action is to coat the steel beam surfaces .with a qualified fire-proof material. Enclosed as Attachment I is the information on the fire-proof material and relevant drawings of the area.

b 8507220145 850710 )00 PDR ADOCK 05000334 ( \ /

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Beaver Valley Power Station, Unit No. 1 Docket No. 50-334, License No. DPR-66 Appendix R - Structural Steel Fire Coating Page 2 This scope of work will not be without difficulty. Due to the sensitive electrical equipment located in these areas, the fire-proof material will most probably be substantially hand-troweled onto the beam surfaces versus spraying. Accessibility to some beam surfaces will be difficult due to the amount of equipment (i.e., conduit, cable raceways, ventilation ductwork etc.)

located in the relatively low ceiling area. It is our understanding that if any portions of required structural beams are not coated, your staff may require hazard. a Thesuppression system in type of electrical the affected equipment areaintothese located address the p(otential areas such as clcctrical switchgear, relays, solid state protection system and process instrumentation equipment) would not be conducive to a water suppression system. In addition, a water or gas suppression system would be extremely difficult and costly to retrofit given the complexity, equipment sensitivity and congestive conditions of the ceiling areas in these rooms.

Our intention is to coat the beams as much as physically achievable. The l magnitude of this effort cannot be totally defined until personnel begin the task and application techniques are refined as the job progresses. Resolution to problem areas will be, on a case-by-case basis, documented and addressed utilizing one of the following options:

1. Performing a structural analysis of particular secondary beam members to preclude the necessity of coating certain inaccessible beams.

2. Utilizing sound fire protection engineering practices and design to box in certain areas with qualified fire-proof material to prevent the spread of fire to inaccessible beam portions.

3. Providing justification for not coating beams in certain areas requiring removal or relocation of equipment obstructing access for installation of the fire-proof material which could result in degra-dation of overall facility safety.

In the event one of the above options is pursued, it will be submitted with adequate justification as part of our original exemption submittal on structural steel. For this reason, we wish to keep the pending exemption request open. If coating of all required beam surfaces can be accomplished, the exemption will be formally withdrawn at that time.

Our schedule for implementation is to initiate coating of beams in areas operationally allowable without delay. Coating of the beams in the Process Instrument Room (CP-4) will require an outage due to the sensitive electrical equipment within the room. Since the fire-proofing task cannot be accom-plished before the end of the 5th Refueling Outage (tentatively scheduled to start in May of 1986), we are therefore requesting a schedular exemptior. from the requirements of 10CFR50.48(c)(4) in accordance with the provisions of 10CFR50.12. In the interim, compensatory measures will be implemented to provide an acceptable level of alternate shutdown capability until the necessary modifications are completed. For each fire area in question, a

. B;avar Valley Power Station, Unit No. 1 Dock:t No. 50-334, License No. DPR-66 Appendix R - Structural Steel Fire Coating Page 3 four-hour roving fire watch has been instituted as all the areas have ear-ly-warning full-area coverage automatic detection systems that alarm in the control room in the event of a fire. The response time would be minimal with the control room located within the same building two floors above the switchgear areas in question.

Please contact my staff if additional information or clarifications are necessary.

Very r y ours, I

J J. Carey Vice President, Nuclear Attachment cc: Mr. W. M. Troskoski, Resident Inspector

.U. S. Nuclear Regulatory Comission Beaver Valley Power Station Shippingport, PA 15077 U. S. Nuclear Regulatory Comission c/o Document Management Branch Washington, DC 20555 Director, Safety Evaluation and Control Virginia Electric & Power Company P.O. Box 26666 One James River Plaza Richmond, VA 23261 U. S. Nuclear Regulatory Comission Office of Inspection and Enforcement Attn: Dr. Thomas E. Murley, Regional Director Region 1 631 Park Avenue King of Prussia, PA 19406 Mr. Peter Tam, Project Manager U. S. Nuclear Regulatory Comission Phillips Building Washington, DC 20555 -

- Mail Stop 438 -

O ATTACHMENT I Summary Information on Fire-Proof Coating Material and Area The fireproofing material to be utilized is Cafcote 560, a cementitious mixture manufactured by US Mineral Products Company. This material is UL tested, and per UL Design No. N714 (UL Fire Resistance Directory) a thickness of 1" applied, contour fashion, on exposed beam surfaces, will provide a li-hour fire rating to the restrained floor assembly.

The cable spreading room concrete floor thickness on the beam-supported metal deck is a minimum of 4", with a maximum of Si" at the deck flutes. Per the NFPA Fire Protection Handbook (15th Edition, Page 5-77, Fig. 5-8F), such concrete floor thickness has over li hours of fire resistance. Per the UL Fire Resistance Directory, since the floor has a greater capacity for heat dissipation than what is required in VL Design No. N714, a 11 hour1.273148e-4 days <br />0.00306 hours <br />1.818783e-5 weeks <br />4.1855e-6 months <br /> protection for the beams alone would be sufficient for a similar fire rating for the entire floor assembly.

Cafcote 560 has been used for steel fireproofing at Limerick and at Three Mile Island, i

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