Text

Forwards Fire Protection Evaluations Re Fire Barrier Deviations,Emergency Lights & Protection Against Spurious Actuation of Automatic Fire Suppression Sys,For Review & Concurrence
	ML20132C560
Person / Time
Site:	Crystal River
Issue date:	07/25/1985
From:	Westafer G; FLORIDA POWER CORP.
To:	Stolz J; Office of Nuclear Reactor Regulation
References
	3F0785-31, 3F785-31, GL-85-01, GL-85-1, NUDOCS 8507300364
	Download: ML20132C560 (42)
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Power C OR POR ATION July 25,1985 3F0785-31 Director of Nuclear Reactor Regulation Attention: Mr. John F. Stolz, Chief Operating Reactors Branch #4 Division of Licensing U.S. Nuclear Regulatory Commission Washington, DC 20535

Subject:

Crystal River Unit 3 Docket No. 50-302 Operating License No. DPR-72 Appendix R/ Fire Protection Evaluations

Dear Sir:

Attached are three evaluations of fire protection features at Crystal River Unit 3 (CR-3). These have been prepared using the Euldance provided in draf t Generic Letter 85-01, and guldance obtained through discussions with fire protection reviewers D. Kubick! and S. West. Notes on each evaluation are provided below.

1. Evaluation of Fire Barrier Deviations - Section 3.1.2,"Previously Accepted Fire Area Boundarles", of draf t Generic Letter 85 01 states in part:

"If a fire area boundary was described as a rated barrier in the 1977 Fire Itazards Analysis, and was evaluated and accepted in a published SER, the fire area boundary need not be reviewed as part of the re-analysis for compilance with Section Ill.G of Appendix R."

Our attached evaluation is based on the previous acceptance of the fire area boundarles separating the A and B 480 V switchgear rooms from the cable spreading room. Additional barriers are evaluated where the protection afforded is equivalent or better, and the hazard is comparable to the previously accepted areas. The prevlous acceptance was based on a 1977 Fire llazards Analysis (Fila) and walkdowns conducted by NRC Inspectors.

Fire loading values in the current Fila are higher for these areas than those in the 1977 Fila. The current Fila is a conservative analysis which assumes cable tray fill of at least 50% for all trays and uses actual tray fill if greater than 50% The 1977 Fila used actual fill which in most cases was, i and still is, less than 50% b I

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July 25,1985 3F0785-31 l Page 2 l

2. Evaluation of Emergency Lights - Appendix R 111.3 provides a very general requirement regarding the placement of emergency lights. This evaluation is provided to describe Florida Power Corporation's position on emergency lighting and its specific application at CR-3.

3. Evaluation of Protection Against Spurious Actuation of Automatic Fire Suppression Systems - The Fire Protection Safety Evaluation Report for CR-3 dated July 27, 1979 required that drip shields be provided for safety related motor control centers in areas where automatic sprinklers were Installed. Those shleids have not been Installed and are not planned based on the attached evaluation.

We request that these evaluations be forwarded to the appropriate NRC staff for revlew, evaluation and concurrence.

Should you have any questions or require further Information, please contact this office.

Sincerely,

,/ /

s '.aK wl G. R. Westafer Manager, Nuclear Operations Licensing and Fuel Management SCP/feb Attachments L

ATTACHMENT 1 July 25, 1985 I

EVALUATION OF FIRE BARRIER DEVIATIONS

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SUMERY OF FIRE BARRIER DEVIATIONS I

l Appendix R, Section !!!.G.2.a requires separation of cables and equipment of redundant safe shutdown systems by a fire barrier having a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months rating.

Elevation 124' of the Control Complex does not meet this criteria due to the '

construction of the ceiling, which separates this elevation from the Cable Spreading Room. The ceiling is constructed of steel plate on protected and l unprotected structural steel with a 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months fire resistant material on the top !

of the steel. Penetrations through the ceiling are sealed above the steel. ;

This construction results in a one-directional fire barrier from the top down. The Cable Spreading Room meets the criteria of Appendix R, Section

!!!.G.2.c (separation by detection, automatic suppression, and 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months fire barrier); therefore, a deviation for only fire areas on the 124' elevation is t requested. The fire areas affected are:

CC-124-111 CRD and Communication Equipment Room CC-124-112 EFIC Room 'A' ,

CC-124-113 EFIC Room 'C' i CC-124-114 EFIC Room 'D'

CC-124-115 EFIC Room 'B' t CC-124-116 480V ES Switchgear Bus Room 38

CC-124-117 480V ES Switchgear Bus Room 3A The following sections present the specific deviation requests, the detailed technical bases for the deviations and the conclusions. )

Figure I presents the layout of these fire areas. I i

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FIRE AREA CC-124-111 CRD and Communication Equipment Room l

DEVIATION PROPOSED Appendix R,Section III.G.2.a requires separation of cables and equipment of redundant safe shutdown systems by a fire barrier having a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months rating.

Fire Area CC-124-111 in the Control Complex does not meet this critria due to the construction of the ceiling, which separates this elevation from the cable spreading room. The ceiling is constructed of sccel plate on protected and unprotected structural steel with a 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months fire resistant material on the top of the steel. Penetrations through the ceiling are sealed above the steel.

A deviation from the above requirement is proposed due to the difficulty in protecting the underside of the steel because of excessive interference by cable trays, conduits, and equipment, r This ceiling was previously accepted as a fire area barrier for adjacdnt fire areas CC-124-116 and CC-124-117 under the guidance of Appendix A of Branch Technical Position 9.5.1. (Safety Evaluation by the Office of duclear Reactor Regulation Supporting Anendment No. 23 to License Nc. DPR-72, Docket No.

50-302, dated July 27, 1979)

TECHNICAL BASES FOR DEVIATION Combustible Material ()lantity Cable (Note 1) 8994 lbs.

Fire loading - 24,310 BTU /sq ft Maximum permissible fire loading - 38,000 BTU /sq ft (Note 2)

Heat Rate - C/875'F Maximum Severity Fire - 18 minutes ,

Note 1: The quantity of cable insulation called out above is based on 50%

fill for all cable trays that are filled with cable up to 50% full by volume. For cable trays that are more thar. 50% full, the actual percentage fill has been used. This is extremely conservative, since very few trays are filled to greater than 50% and the actual plant average tray fill is significantly lower. '

Note 2: The maximum permissible fire loading is based on an evenly distributed loading of combustible materials and is based upon the limitation of the steel ceiling construction.

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FIRE AREA CC-124-111 (continued)

Design Basis Fire The maximum severity fire is based upon the 'E' curve of the NFPA Handbook (15th edition) which corresponds to the standards of ASTM E-119 and NFPA-251.

Since the only combustible is IEEE-383 type cable, which through fire tests has shown to have properties that limit the ability to sustain a fire, the design basis fire is postulated to be a slow burning fire (equivalent to a 'C' curve fire) that reaches a maximum temperature of 875'F. This is less than the 1100*F critical temperature of structural steel.

The design basis fire is conservatively based on the simultaneous total combustion of all combustibles in the area.

Fire Protection Equipment Full area wet pipe sprinkler coverage will be provided. Additional fire protection equipment in the zone consists of 3 portable C02 fire extinguishers. Portable fire extinguishers are also located in adjacent areas CC-124-114, CC-124-116, CC-124-117 and CC-124-122. In addition, ionization smoke detectors located within the area provide an early warning alarm in the control room.

Construction All walls and the floor are concrete with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rating. The ceiling is steel plate on protected and unprotected structural steel with a 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months directional fire barrier from the top down. Class A fire doors access areas CC-124-114, CC-124-116, CC-124-117, and CC-95-122. Ventilation duct with 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months rated fire dampers communicates with areas CC-108-107 CC-134-118, CC-124-114, CC-124-115, CC-124-116, and CC-124-117. Ventilation ducts with 1 -1/2 hour dampers and ducts with 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months dampers communicates with area CC-134-118A (Cable Spreading Room ) through the 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months directional barrier (ceiling). Electrical and mechanical penetrations in the walls and floor of this fire area are provided with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rated penetration seal.

O FIRE AREA CC-124-111 (continued)

Safe Shutdown Equipment '

Safe shutdown components listed below that are underlined will be protected in a 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months fire rated enclosure / Wrap.

AIR HANDLING SYSTEM: a Train 0 - Ductwork Reactor Building Fans Train 1 - Remote shutdown circuits to AHF-1A Train 2 - Remote shutdown circuits to AHF-1B Diesel Generator Room Fans Train 1 - Normal and Remote shutdown i circuits to AHF-22A l Train 2 - Remote shutdown circuit to IIF-22C; Normal circuits to AHF-22D EFIC Room HVAC Train 1 - Circuits to fan AHF-54A; Valves and Circuits to valves CHV-108, CHV-113 Train 2 - Circuits to fan AHF-54B; Circuits to valves CHV-90, CHV-97, CHV-100, CHV-101 Control Complex HVAC Train 1 - Circuits to AHF-20A Train 2 - Circuits to AHF-20B DECAY HEAT CLOSED CYCLE Train 1 - Remote shutdown circuits to COOLING SYSTEM: pump DCP-1 A l Train 2 - Remote shutdown circuits to pump DCP-1B DECAY HEAT SYSTEM:

1 l DH Removal Train 1 - Remote shutdown circuits to pump DHP-1A Train 2 - Remote shutdown circuits to pump DHP-1B j RC Outlet Isolation Train 1 - Remote shutdown circuits for valve DHV-3 Train 2 - Remote shutdown circuits for valve DHV-4

FIRE AREA CC-124-111 (continued)

EMERGENCY FEEDWATER SYSTEM:

r EF Flow Paths Train 1 - Remote shutdown and normal circuits for EFIC Control, pump EFP-1; Normal circuits to valves EFV-57, EFV-58; Remote shutdown circuits to valves EFV-14, EFV-33, EFV-57, EFV-58 Train 2 - Remote shutdown circuits for EFIC Control; Remote shutdown ci rcuits to ASV-5, EFV-ll, EFV-32, MSV-55, MSV-56; Normal circuits to valves EFY-ll, EFV-32, EFV-55 Main FW Isolation Train 1 - Normal circuits to FWV-14 FWV-15 Train 3 - Normal circuits to valves FWV-29, FWV-30, FWV-33, FWV-36 MAIN STEAM SYSTEM:

MSIV's Train 1 - Circuits to valves MSV-411-SV2, MSV-412-SV2, MSV-413-SV2, MSV-414-SV2 Steam Generator Press. Train 2 - Circuits to instruments MS-107-PT, MS-108-PT, MS-lll-PT, MS-ll2-PT ELECTRICAL DISTRIBUTION SYSTEM: Train 1 - Remote shutdown circuits to 4kV Breakers 3205, 3209, 3221, to 480V Breaker 331, to EGDG-1 A, R5 Isolation Relay, 4kV Differential Meter; Normal circuits to 4kV UV, Breaker I 3209, EGDG-1 A t

Train 2 - Remote shutdown circuits to 4KV Breakers 3206, 3210, 3220, to 480V Breaker 3310, to EGDG-1B, RS Isolation Relay, 4kV Differential Meter; Normal ci rcuits to EGDG-1B MAKE-UP AND PURIFICATION SYSTEM:

Make up Charging Paths Train 1 - Remote shutdown circuits to pumps MUP-1 A, MVP-2A, MVP-4A; to valves MUV-27, MUV-73; Nomal circuits to MVP-1 A, MUP-4A, MVP5A, MUV-27, MUV-73

FIRE AREA CC-124-111 (continued)

Train 2 - Remote shutdown circuits to pumps MUP-1C, MUP-30, MVP-4C, to valves MUV-25, MUV-58; Normal circuits to MVP-lC, MVP-SC, MUV-58 Swing Pump Train 182 - Remote shutdown circuits to jumps MUP-2B, MVP-38, MVP-48; trmal circuits to MVP-5B Train 1 - Normal circuits to MVP-18, MUV-3; Remote shutdown ci rcuits to pump MUP-1B Train 2 - Nonnal circuits to MVP-1B MUV-3; Remote shutdown circuits to pump MUP-lB, MUV-23 Letdown Isolation Train 1 - Remote shutdown circuits to valves MUV-40, MUV-41; Nondal circuits to valves MUV-40, MUV-41 Train 2 - Remote shutdown circuit to MUV-49; Normal cin:uit to MUV-49 REACTOR COOLANT SYSTEM:

RC Instrumentation Train 1 - Remote shutdown circuits to instruments RC-1-LT1, RC-2-TEl , RC-4A-TEl , RC-5A-TE2 Train 2 - Remote shutdown circuits to instruments RC-1-LT3, RC-2-TE2, RC-4B-TE4, RC-5B-TE4 RC Drain Tank Isolation Train 1 - Remote shutdown and normal circuits to RCV-10 Train 2 - Remote shutdown circuits to RCV-11 NUCLEAR SERVICE SEAWATER SYSTEM:

Nuc. Service SW Pumps Train 1 - Remote shutdown circuits to pump RWP-2A Train 2 - Remote shutdown circuits to pump RWP-2B

- FIRE AREA CC-124-111 (continued)

DH Service SW Pumps Train 1 - Remote shutdown circuits to RWP-3A Train 2 - Remote shutdown circuits to RWP-3B SECONDARY PLANT INSTRUENTATION SYSTEM:

Steam Generator Level Train 2 - Circuits to instruments SP-18-DPT, SP-19-DPT, SP-22-DPT, SP-23-DPT, SP-26-DPT, SP-2 7-DPT, SP-31-DPT, SPS-30-DPT CST Level Indication Train 2 - Circuits to instrument CD-99-DP T NUCLEAR SERVICE CLOSED CYCLE COOLING WATER SYSTEM:

SW Pumps Train 1 - Remote shutdown circuits to pump SWP-1 A Train 2 - Remote shutdown circuits to pump SWP-1B RB Fan Cooling Train 1 - Remote shutdown circuits to valves SWV-353A, SWY-354A; Normal cin:uit to SWV-353A Train 2 - Remote shutdown circuits to Valves 5WV-3538, SWV-354B Train 3 - Circuits to valves SWV-39, SWV-45 Safety Related Equipment Not Required for Safe Shutdown ELECTRICAL DISTRIBUTION SYSTEM: Train A - Trays 153, 212, 215, 216, 260, 261, 262, 253, 264, 631, 633 for control power; circuits in conduit Train B - Trays 120,154, 206, 217, 265, 266, 267, 268, 640, 643 for control power; circuits in conduit Train C - Tray 623 for control power Train AB- Circuits in conduit CORE FLOOD SYSTEM: Train AB- Circuits in conduit

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P FIRE AREA CC-124-111 (continued)

MAIN STEAM SYSTEM: Train AB- Circuits in conduit MAKE-UP AND PURIFICATION SYSTEM: Train B - Circuits in conduit Train AB- Circuits in conduit NUCLEAR SERVICE CLOSED CYCLE COOLING WATER SYSTEM: Train A - Circuits in conduit Train B - Circuits in conduit

EMERGENCY FEEDWATER SYSTEM: Train A - Circuits in conduit AIR HANDLING SYSTEM: Train A - Circuits in conduit Train B - Circuits in conduit Train AB- Circuits in conduit; heat exchangers AHHE-6D; AHHE-6E, AHHE-6F i

SERVICE AIR SYSTEM: Train AB- Piping FIRE SERVICE WATER SYSTEM: Train AB- Piping

Consequences of Design Basis Fire

, The ionization detectors will detect the products of combustion from an incipient fire and alert the control room for prompt response by the fire brigade. The available fire protection equipment is adequate to extinguish a

, design basis fire in this area.

Train 2 components of the Air Handling System (all functions) will be protected and available for safe shutdown with the exception of diesel generator room fan AHF-22D. This fan (for Diesel Generator Room Fans) may be lost as a result of design bases fire, however, fan AHF-22C will be available for Train 2.

For the Air Handling System (Control Complex HVAC), loss of fans AHF-20A (Train 1) and AHF-208 (Train 2) may occur as a result of a design basis fire.

This is acceptable because the remaining components in both trains will be available to cool the Main Control Room and the dedicated HVAC system may be

.used to cool the other Control Complex areas.

Both trains are available for safe shutdown for the Decay Heat Closed Cycle i Cooling and Decay Heat Systems. The valves should be operated manually if requi red.

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I FIRE AREA CC-124-111 (continued)

. Train 2 of the Emergency Feedwater System (EF Flow Paths) is being relied upon for a fire in this area. Power circuits to valve EFV-55 will be lost; however, this will only prevent the normally open valve from closing. Control of emergency feedwater flow can be accomplished through EFV-11 and EFV-32.

Train 2 for the Emergency Feedwater System (Main FW Isolation) is also completely functional. Trains 1 and 3 may be disabled as a result of a fire.

Train 2 of the Main Steam System (MSIV's).will be functional for safe shutdown. Train 1 may be lost as a result of a fire. Train 2 circuits for i Steam Generator Pressure Instrumentation will be protected and therefore will be available for safe shutdown.

Train 2 of the Electrical Distribution System is protected and functional for safe shutdown. Train 1 may be disabled as a result of a design basis fire.

Train 2 of the Makeup and Purification System (Charging Paths) will be available for safe shutdown. MUP-5C could be disabled as a result of a design basis fire, however, MVP-4C is functional as a backup gear oil pump. Train 1 1 components MVP-5A, MUP-4A, MW-27 and MW-73 may be lost as a result of a design basis fire.

Both Trains of the Swing Pump are functional. There is an unprotected circuit for MUP-1B which is not needed for a fire in this area. MVP-5B may be lost as 4 a result of a. fire, however, MVP-4B is available as a back up gear oil pump.

For Train 2, the charging path is via MW-3, 4 and 25 since MW-23 and MW-27 may be lost for a fire in this area.

Train 1 Makeup and Purification (Letdown Isolation) is functional for a fire in this area. The unprotected circuits to MW-40 and MW-41 have a fuse installed in the circuit such that control of the valves will be maintained in the event of fire induced damage. Should the 'A' diesel be lost in conjunction with a loss of offsite power, cross-tieing of the 480V Busses will be required.

I Both trains of RC Instrumentation are available because all of the circuits in f the area are remote shutdown circuits that are not required for a fire in this

area. Train 2 of the P.eactor Coolant System (RC Drain Tank Isolation) is completely functional . -

4 Both trains are also available for the Nuclear Service Seawater System and Secondary Plant Instrumentation.

The low combustible loading, fire detection, high personnel traffic, full area automatic suppression, and construction of the walls preclude the design basis fire from propagating to other fire areas.

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FIRE AREA CC-124-111 (continued)

CONCLUSION The design basis fire will not affect the capability to achieve and maintain cold shutdown. Administrative limits must be put in place to restrict the amount and type of transient combustibles in the area. The total combustible loading must not exceed 38,000 BTU's/sq. ft.

Thus, Impe11 believes upgrading the fire resistance rating of the ceiling is not warranted, and would not enhance the level of safety afforded to the public.

FIRE AREA CC-124-112 EFIC Room "A" DEVIATION PR000 SED Appendix R,Section III.G.2.a requires separation of cables and equipment of redundant safe shutdown systems by a fire barrier having a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rating. Fire Area CC-124-112 in the Control Complex does not meet this criteria due to the construction of the ceiling, which separates this elevation from the cable spreading room. The ceiling is constructed of steel plate on protected and unprotected structural steel with a 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months fire resistant material on the top of the steel. Penetrations through the ceiling are sealed above the steel.

A deviation from the above requirement is proposed due to the difficulty in protecting the underside of the steel because of excessive interference by cable trays, conduits, and equipment.

This ceiling was previously accepted as a fire area barrier for fire areas CC-124-116 and CC-124-117 under the guidance of Appendix A of Branch Technical Position 9.5.1 (Safety Evaluation by the Office of Nuclear Reactor Regulation

-Suppo'rting Amendment No. 23 to License No. DPR-72, Docket No. 50-302, dated July 27,1979).

TECitlICAL BASES FOR DEVIATION Combustible Material Quantity Cable (Note 1) 77 lbs Fire loading - 3687 BTU /sq. ft.

Maximum permissible fire loading - 38,000 BTU /sq ft (Note 2)

Heat Rate - C/500*F Maximum Severity Fire - 2 minutes Note 1: The quantity of cable insulation called out above is based on 50%

fill for all cable trays that are filled with cable up to 50% full by vol ume. For cable trays that are more than 50% full, the actual percentage fill has been used. This is extremely conservative, since very few trays are filled to greater than 50% and the actual plant average tray fill is significantly lower.

Note 2: The maximum pennissible fire loading is based on an evenly distributed loading of combustible materials and is based upon the limitation of the steel ceiling construction.

FIRE AREA CC-124-112 (continued)

Design Basis Fire The maximum severity fire is based upon the 'E' curve of the NFPA Handbook (15th edition) which corresponds to the standards of ASTM E-119 and NFPA-251.

Since the only combustible is IEEE-383 type cable, which through fire tests has shown to have properties that limit the ability to sustain a fire, the design basis fire is postulated to be a slow burning fire (equivalent to a 'C' fire ) that reaches a maximum temperature of 500*F. This is less than the 1100*F critical temperature of structural steel.

The design basis fire is conservatively based on the simultaneous total combustion of all combustibles in the area.

Fire Protection Equipment There is no fire fighting equipment in this area. Portable fire extinguishers are available in adjacent area CC-124-114 and nearby area CC-124-111. In addition, an ionization smoke detector located within the area provides an early warning alarm in the control room.

Construction The north and west walls and the floor are concrete with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rating. The south and east walls are gypsum board walls with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rating. The ceiling is steel plate on protected and unprotected structural steel with a 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months directional fire barrier from the top down. A Class A fire door in the south wall accesses area CC-124-114. Electrical and mechanical penetrations in the walls and floor of this fire area are provided with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rated penetration seal. Ventilation ducts with 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire dampers communicate with fire areas CC-124-114 and CC-124-113.

Safe Shutdown Equipment EMERGENCY FEEDWATER SYSTEM:

EF Flow Paths Train 1 - Circuits for EFIC Control; Circuits for EFIC~

Instrumentation; Circuits to valves EFV-57, EFV-58 Train 2 - Circuits for EFIC Instrumentation MAIN STEAM SYSTEM:

Steam Gen. Press. Train 1 - Circuits to instruments MS-106-PT, MS-110-PT ELECTRICAL DISTRIBUTION SYSTEM: Train 1 - VBDP-8; Circuits to "A" Inverter and VBDP-8; Circuits to RS Isolation Relay FIRE AREA CC-124-112 (continued)

SECONDARY PLANT INSTRUMENTATION:

Steam Gen. Level Train 1 - Circuits to instruments SP-17-DPT, SP-21-DPT, SP-25-DPT, SP-29-DPT CST Level Train 1 - Circuits to instrument CD-98-DPT Safety Related Equipment Not Required for Safe Shutdown CORE FLOOD SYSTEM: Train AB- Circuits in conduit MAIN STEAM SYSTEM: Train AB- Circuits in conduit ELECTRICAL DISTRIBUTION SYSTEM: Train A - Tray 638 for control power Consequences of Design Basis Fire The ionization detectors will detect the products of combustion from an incipient fire and alert the control room for prompt response by the fire brigade. The available fire fighting equipment is adequate to extinguish the design basis fire; The low combustible loading, fire detection, and construction of the walls preclude the design basis fire from propagating to other fire areas.

Loss of Train 1 of the safe shutdown systems listed above may occur as a result of a design basis fire in this area. Train 2 circuits for EFIC instrumentation may also be lost for the Dnergency Feedwater System; however, the circuits that are redundant to Train 1 are in conduit that is protected by a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months rated fire enclosure / wrap. Therefore, Train 2 of all the above shutdown systems will be available for a fire in this area.

CONCLUSION l A design basis fire will not affect the capability to achieve and maintain l cold shutdown. Administrative limits must be put in place to restrict the l amount and type of transient combustibles in the area. The total combustible j loading must not exceed 38,000 BTU's/sq. ft.

l Thus, Impe11 believes upgrading the fire resistance rating of the ceiling is i not warranted, and would not enhance the level of safety afforded to the public.

l L

i .

FIRE AREA CC-124-113 l

L EFIC Room "C" DEVIATION PROPOSED Appendix R,Section III.G.2.a requires separation of cables and equipment of redundant safe shutdown systems by a fire barrier having a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire

rating. Fire Area CC-124-113 in the Control Complex does not meet this criteria due to the construction of the ceiling, which separates this i elevation from the cable spreading room. The ceiling is constructed of steel l plate on protected and unprotected structural steel with a 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months fire '

resistant material on the top of the steel. Penetrations through the ceiling are sealed above the steel.

A deviation from the above requirement is proposed due to the difficulty in protecting the underside of the steel because of excessive interference by cable trays, conduits, and equipment.

I This ceiling was previously accepted as a fire area barrier for fire areas

, CC-124-116 and CC-124-117 under the guidance of Appendix A of Branch Technical Position 9.5.1 (Safety Evaluation by the Office of Nuclear Reactor Regulation Supporting leendment No. 23 to License No. DPR-72, Docket No. 50-302, dated July 27,1979).

t TECitlICAL BASES FOR DEVIATION Combustible Material Quantity Negligible N/A Fire loading - Negligible Maximum pemissible fire loading - 38,000 BTU /sq ft (Note 1)

Heat Rate - N/A Note 1: The maximum pemissible fire loading is based on an evenly

distributed loading of combustible materials and is based on the contruction limitations of the ceiling.

Design Basis Fire Since there are no pemanent combustibles, a design basis fire would involve only transient combustibles. A significant fire is not considered credible.

4 l

t FIRE AREA CC-124-113 (continued)

Fire Protection Equipment

There is no fire fighting equipment in the area. Portable fire extinguishers 1

^

are available in adjacent area CC-124-114 and CC-124-111. In addition, an ionization smoke detector located within the area provides an early warning alarm in the control room.

Construction

! The north and east walls and the floor are concrete with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rating. The south and west walls are gypsum board walls with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months rating. The ceiling is steel plate on protected and unprotected structural i steel with a 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months directional fire barrier from the top down. A Class A fire door in .the south wall accesses area CC-124-115. Electrical and mechanical penetrations in the walls and floor of this fire area are provided with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rated penetration seal. Ventilation ducts with 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire dampers communicate with fire areas CC-124-112 and CC-124-115.

Safe Shutdown Equipment AIR HANDLING SYSTEM

EFIC Room HVAC Train 2 - Circuits to valves CHV-100, CHV-101, CHV-90, CHV-97

EMERGENCY FEEDWATER SYSTEM:

l EF Flow Path Train 1 - Circuits for EFIC 1 Instrumentation Train 2 - Circuits to valves EFV-11, EFV-32; Circuits for EFIC Instrumentation; Circuits for EFIC Control MAIN STEAM SYSTEM:

Steam Gen. Pressure Train 2 - Circuits to instruments MS-108-PT, MS-112-PT ELECTRICAL DISTRIBUTION SYSTEM: Train 1 - Circuits to "C" Inverter and l VBDP-9

?

SECONDARY PLANT INSTRUMENTATION:

1 Steam Gen. Pressure Train 2 - Circuits to instruments SP-19-DPT, SP-23-DPT, t SP-27-DPT, SP-31-DPT.

P

FIRE AREA CC-124-113 (continued)

Safety Related Equipment Not Required for Safe Shutdown CORE FLOOD SYSTEM: Train AB- Circuits in conduit MAIN STEAM SYSTEM: Train AB- Circuits in conduit Consequences of Design Basis Fire The ionization detector is expected to detect the products of combustion from an incipient fire and alert the control room for prompt response by the fire brigade. The available fire fighting equipment is adequate to extinguish the design basis fire.

Loss of all safe shutdown circuits listed above may occur as a result of a design basis fire in this area. With the exception of the Bnergency Feedwater System, only one train of the above safe shutdown systems is in the fire area thus, the redundant train would be available for safe shutdown. The Dnergency Feedwater System contains Train 1 and Train 2 circuits for EFIC instrumentation. All of these circuits terminate in the EFIC cabinets located in this fire area. Loss of these circuits is acceptable because at least two of the remaining EFIC channels of a four channel system would be available for operation of the EFIC system, thus, enabling safe shutdown.

The minimal combustible loading, fire detection, and construction of the walls preclude the possibility of a design basis fire propagating to other fire areas.

CONCLUSION A design basis fire will not affect the capability to achieve and maintain cold shutdown. Administrative limits must be put in place to restrict the amount and type of transient combustibles in the area. The total combustible loading must not exceed 38,000 BTU's/sq. ft.

Thus, Impe11 believes upgrading the fire resistance rating of the ceiling is not warranted, and would not enhance the level of safety afforded to the public.

1

FIRE AREA CC-124-114 EFIC Room "D" 1

, DEVIATION PROPOSED Appendix R,Section III.G.2.a requires separation of cables and equipment of :

redundant safe shutdown systems by a fire barrier having a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rating. Fire Area CC-124-114 in the Control Complex does not meet this

, criteria due to the construction of the ceiling, which separates this elevation from the cable spreading room. The ceiling is constructed of steel plate on protected and unprotected structural steel with a 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months fire

resistant material on the top of the steel. Penetrations through the ceiling

! are sealed above the steel.

A deviation from the above requirement is proposed due to the difficulty in protecting the underside of the steel because of excessive interference by cable trays, conduits, and equipment.

4 This ceiling was previously accepted as a fire area barrier for fire areas CC-124-116 and CC-124-117 under the guidance of Appendix A of Branch Technical Position 9.5.1 (Safety Evaluation by the Office of Nuclear Reactor Regulation

Supporting Amendment No. 23 to License No. DPR-72, Docket No. 50-302, dated j July 27,1979).

i

TECWICAL BASES FOR DEVIATION Combustible Material 4antity Negligible N/A 4

Fire loading - Negligible Maximum pemissible fire loading - 38,000 BTU /sq ft (Note 1)

Heat Rate - N/A Note 1: The maximum permissible fire loading is based on an evenly

distributed loading of combustible materials and is based on the construction limitations of the steel ceiling. l l

1 I

Design Basis Fire 4

Since there are no pemanent combustibles, a design basis fire would involve only transient combustibles. A significant fire is not considered credible.

l i

i i . - - _ _ . _ _ - - - . - . - _ _ _ _ - _ - . . _ - . _ . . , _ _ _ . . - . - _ . _ . - - _ . _ _

FIRE AREA CC-124-114 (continued)

Fire Protection Equipment The only fire fighting equipment in the area is 1 portable CO2 fire extinguisher. Other portable fire extinguishers are available in adjacent area CC-124-111. In addition, an ionization smoke detector located within the area provides an early warning alarm in the control room.

Construction The south and west walls and the floor are concrete with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rating. The north and east walls are gypsum board walls with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rating. The ceiling is steel plate on protected and unprotected structural steel with a one hour directional fire barrier from the top down. Class A fire doors in the north, south and east walls access areas CC-124-112, CC-124-111, and CC-124-115, respectively. Ventilation duct with 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire dampers communicates with areas CC-108-105, CC-124-111, and CC-134-118.

Electrical and mechanical penetrations in the walls and floor of this fire area are provided with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rated penetration seal.

Safe Shutdown Equipment Components listed below that are underlined will be protected in a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rated enclosure or wrap.

AIR HANDLING SYSTEM: Train 0 - Ductwork EFIC Room HVAC Train 2 - Circuits to fan AHF-54B; Circuits to valves CHV-90, CHV-97, CHV-100, CHV-101 EMERGENCY FEEDWATER SYSTEM:

EF Flow Paths Train 1 - Circuits for EFIC Control; Circuits for EFIC Instrumentation; Circuits to valves EFY-14, EFV-33 Trai n 2 - Circuits for EFIC Instrumentation MAIN STEAM SYSTEM:

Steam Gen. Pressure Train 1 - Circuits to Instruments MS-109-PT, MS-113-PT ELECTRICAL DISTRIBUTION SYSTEM: Train 2 - Circuits to "D" Inverter and VBDP-11 SECONDARY PLANT INSTRUMENTATION:

Steam Gen. Pressure Train 1 - Circuits to instruments SP-20-DPT, SP-24-DPT, SP-28-DPT, SP-32-DPT FIRE AREA CC-124-114 (continued)

Safety Related Equipment Not Required for Safe Shutdown None.

Consequences of Design Basis Fire With the exception of redundant circuits for EFIC instrumentation, loss of the above listed safe shutdown components may occur as a result of a design basis fire. Redundant circuits to EFIC instrumentation are protected in a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months rated fire enclosure / wrap thereby ensuring operation of the EFIC system.

Redundant trains of the remaining safe shutdown systems are available for safe shutdown.

The minimal fire loading, fire detection, and construction of the walls preclude the possibility of a design basis fire propagating to other fire areas.

CONCLUSION A design basis fire in this area will not affect the capability to achieve and maintain cold shutdown. Administrative limits must be put in place to restrict the amount and type of transient combustibles in the area. The total combustible loading must not exceed 38,000 BTV's/sq. ft.

Thus, Impell believes upgrading the fire resistance rating of the ceiling is not warranted, and would not enhance the level of safety afforded to the public.

i a

1

FIRE AREA CC-124-115 EFIC Room "B"

(

DEVIATION PROPOSED Appendix R,Section III.G.2.a requires separation of cables and equipment of ,

redundant safe shutdown systems by a fire barrier having a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rating. Fire Area CC-124-115 in the Control Complex does not meet this criteria due to the construction of the ceiling, which separates this elevation from the cable spreading room. The ceiling is constructed of steel plate on protected and unprotected structural steel with a 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months fire resistant material on the top of the steel. Penetrations through the ceiling are sealed above the steel. .

A deviation from the above requirement is proposed due to the difficulty in protecting the underside of the steel because of excessive interference by

. cable trays, conduits, and equipment.

This ceiling was previously accepted as a fire area barrier for fire areas CC-124-116 and CC-124-117 under the guidance of Appendix A of Branch Technical Position 9.5.1 (Safety Evaluation by the Office of Nuclear Reactor Regulation i Supporting Amendment No. 23 to License No. DPR-72, Docket No. 50-302, dated -

July 27,1979).

TECHNICAL BASES FOR DEVIATION :

) Combustible Material Quantity Cable (Note 1) 103 lbs Fire loading - 5207 BTU /sq. ft.

Maximum permissible fire loading - 38,000 BTU /sq ft (Note 2)

Heat Rate - C/550*

Maximum Severity Fire - 4 minutes i

Note 1: The quantity of cable insulation called out above is based on 50% '

4 fill for all cable trays that are filled with cable up to 50% full by i vol ume. For cable trays that are more than 50% full, the actual percentage fill has been used. This is extremely conservative, since i

very few trays are filled to greater than 50% and the actual plant average tray fill is significantly lower.

Note 2: The maximum permissible fire loading is based on an evenly distributed loading of combustible materials and is based upon the limitation of the steel ceiling construction.

i i

I

i FIRE AREA CC-124-115 (continued)

Design Basis Fire The maximum severity fire is based upon the 'E' curve of the NFPA Handbook (15th edition) which corresponds to the standards of ASTM E-119 and NFPA-251. ;

Since .the only combustible is IEEE-383 type cable, which through fire tests has shown to have properties that limit the ability to sustain a fire, the design basis fire is postulated to be a slow burning fire (equivalent to a 'C' curve fire) that reaches a maximum temperature of 550*F. This is less than the 1100*F critical temperature of structural steel.

The design basis fire is conservatively based on the simultaneous total ,

combustion of all combustibles in the area.

Fire Protection Equipment There is no fire fighting equipment in the area. Portable fire extinguishers '

are available in adjacent areas CC-124-114 and CC-124-111. In addition, an ionization smoke detector located within the area provides an early warning alarm in the control room.

Construction The south and east walls and the floor are concrete with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rating. The north and west walls are gypsum board walls with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rating. The ceiling is steel plate on protected and unprotected structural

. steel with a 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months directional fire barrier from the top down. Class A fire ,

doors in the north and west walls access areas CC-124-113 and CC-124-114, ;

respectively. Ventilation duct with 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire dampers communicates with areas CC-124-111 CS-124-114 and CS-124-113. Electrical and mechanical penetrations in the walls and floor of this fire area are provided with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rated penetration seal.

Safe Shutdown Equipment Components listed below that are underlined will be protected in a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rated enclosure or wrap.

AIR HANDLING SYSTEM: i Diesel Generator Rm Fans Train 2 - Circuits to fan ARF-22C EFIC Room HVAC Train 2 - Circuits to fan AHF-54B; !

Circuits to valves CHV-90, l CHV-97, CHV-100, CHV-101 EMERGENCY FEEDWATER SYSTEM:

i EF Flow Paths Train 1 - Circuits for EFIC I

Instrumentation l

l _ . _ _ _ _ _ _ _ _ __ _ -_. _ _ _ . _ . . -. ~ . _ _ _ _

9 FIRE AREA CC-124-115 (continued)

Train 2 - Circuits for EFIC Control; Circuits for EFIC Instrumentaton; Circuits to valves ASV-5, EFV-11, EFV-32, EFV-55, EFY-56, MSV-55, MSV-56 Main FW Isolation Train 1 - Circuits to valves FWV-14, FWV-15 Train 3 - Circuits to valves FWV-29, FW-30, FW-33, FW-36 MAIN STEAM SYSTEM: MSIV's Train 2 - Circuits to valves MSV-411-SVI , MSV-412-SV1, MSV-413-SV1, MSV-414-SV1 Steam Gen. Pressure Train 2 - Circuits to instruments MS-107-PT, MS-108-PT, MS-111-PT, MS-112-PT ELECTRICAL DISTRIBUTION SYSTEM: Train 2 - VBDP-10; Circuits to "B" Inverter and VBDP-10, 4kV UV, 4kV Breaker 3210, EGDG-1B, RS Isolation Relay MAKE-UP AND PURIFICATION SYSTEM:

Makeup Charging Paths Train 2 - Circuits to pump MVP-4C; Circuits to valves MUV-25, MUV-58 SECONDARY PLANT INSTRUMENTATION:

Steam Gen. Pressure Train 2 - Circuits to instruments SP-18-DPT, SP-19-DPT, SP-22-DPT, SP-23-DPT, SP-26-DPT, SP-27-DPT, SP-31-DPT, SP-30-DPT CST Level Indicator Train 2 - Circuits to instrument CD-99-DPT NUCLEAR SERVICE CYCLE CLOSED COOLING WATER SYSTEM:

RB Fan Cooling Train 2 - Circuits to valves SWY-37, SW-43, SW-3538, SW-354B Safety Related Equipment Not Required for Safe Shutdown ELECTRICAL DISTRIBUTION SYSTEM: Trai n B - Trays 647, 648 for Control Power FIRE AREA CC-124-115 (continued) l j Consequences of Design Basis Fire With the exception to circuits for EFV-11 and EFV-32, loss of the above listed safe shutdown components may occur as a result of a design basis fire in this c 4

area. The Emergency Feedwater System (EF Flow Paths) has Train 1 and Train 2 circuits for the EFIC system. All of these circuits either tenninate in or are associated with EFIc Cabinet "B", which is in the fire area. Loss of

these circuits is acceptable because at least two channels of the EFIC system are still operable for a fire in this area. Train 1 is completely functional

! for suction from the condensate storage tank.

Train 1 and Train 3 of the Emergency Feedwater System (Main FW Isolation) may

} be lost as a result of a fire in this area. Train 2 is functional, however, i for main feedwater isolation.

For the remaining safe shutdown systems listed above, Train 1 is operable for i safe shutdown. i

. The low fire loading, available fire detection, and the construction of the walls preclude the possibility of a design basis fire propagating to other fire areas. .

$ CONCLUSION A design basis fire will not affect the capability to achieve and maintain cold shutdown. Administrative limits must be put in place to restrict the

amount and type of transient combustibles in the area. The total combustible l

loading must not exceed 38,000 BTU's/sq. ft.

Thus, Impell believes upgrading the fire resistance rating of the ceiling is not warranted, and would not enhance the level of safety afforded to the public.

b L

1 1

i i i i

i

FIRE AREA CC-124-116 480V ES Switchgear Bus Room 3B DEVIATION PROPOSED Appendix R,Section III.G.2.a requires separation of cables and equipment of redundant safe shutdown systems by a fire barrier having a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rating. Fire Area CC-124-116 in the Control Complex does not meet this criteria due to the construction of the ceiling, which separates this elevation from the cable spreading room. The ceiling is constructed of steel plate on protected and unprotected structural steel with a 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months fire resistant material on the top of the steel. Penetrations through the ceiling are sealed above the steel.

A deviation from the above requirement is proposed due to the difficulty in protecting the underside of the steel because of excessive interference by cable trays, conduits, and equipment.

This ceiling was previously accepted as a fire area barrier under the guidance of Appendix A of Branch Technical Position 9.5.1 (Safety Evaluation by the Office of Nuclear Reactor Regulation Supporting Amendment No. 23 to License No. DPR-72, Docket No. 50-302, dated July 27, 1979 SER Section 5.12.6). Since the previous acceptance, no new cable trays have been added in this area and the addition of cable to the existing trays has been minimal.

TECHNICAL BASES FOR DEVIATION Combustible Material Quantity Cable (Note 1) 1682 lbs.

Fire loading - 33,744 BTU /sq ft Maximum pennissible fire loading - 38,000 BTU /sq ft (Note 2)

Heat Rate - C/1030*F Maximum Severity Fire - 25 minutes Note 1: The quantity of cable insulation called out above is based on 50%

fill for all cable trays that are filled with cable up to 50% full by volume. For cable trays that are more than 50% full, the actual percentage fill has been used. This is extremely conservative, since very few trays are filled to greater than 50% and the actual plant average tray fill is significantly lower.

Note 2: The maximum permissible fire loading is based on an evenly distributed loading of combustible materials and is based upon the limitation of the steel ceiling construction.

FIRE AREA CC-124-116 (continued)

Design Basis Fire The maximum severity fire is based upon the 'E' curve of the NFPA Handbook (15th edition) which corresponds to the standards of ASTM E-119 and NFPA-251.

Since the only combustible is IEEE-383 ty>e cable, which through fire tests has shown to have properties that limit the ability to sustain a fire, the design basis fire is postulated to be a slow burning fire (equivalent to a 'C' curve fire) that reaches a maximum temperature of 1030*F. This is less than the 1100*F critical temperature of structural steel.

The design basis fire is conservatively based on the simultaneous total combustion of all combustibles in the area.

Fire Protection Equipment Fire fighting equipment in the area consists of 1 portable CO2 fire extinguisher. Portable fire extinguishers are also available in adjacent areas CC-124-111 and CC-124-117. In addition, ionization smoke detectors are located within the area provide an early warning alarm in the control room.

\

Construction All four walls and the floor are concrete with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rating. The ceiling is steel plate on protected and unprotected structural steel with a1 hour rated directional fire barrier from tk top down. A Class A fire door in the north wall accesses area CC-124-111. Ventilation duct with 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire dampers communicates with area CC-124-111. Electrical and mechanical penetrations in the walls and floor of this fire area are provided with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rated penetration seal.

Safe Shutdown Equipment Components listed below that are underlined will be protected in a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rated enclosure / Wrap.

AIR HANDLING SYSTEM:

Diesel Gen. Room Fans Train 2 - Circuits to fan AHF-22D EFIC Room HVAC Train 2 - Circuits to CHHE-1B Control Complex HVAC Train 2 - Circuits to fans AHF-208, AHF-198 Train 0 - Ductwork DECAY HEAT CLOSED CYCLE Train 2 - Circuits to pump DCP-1B COOLING SYSTEM:

DECAY HEAT SYSTEM.

RC Outlet Isolation Train 2 - Circuits to valve DHV-4 FIRE AREA CC-124-116 (continued)

EMERGENCY FEEDWATER SYSTEM:

EF Flow Paths Train 1 - Circuits to valves EFV-14, EFV-33 Train 2 - Circuits to valves ASV-5, EFV-11. EFV-32, EFV-55 EFY-56, N5Aili, MSV-56 Main FW Isolation Train 1 - Circuits to valve FWV-14 Train 3 - Circuits to valves FWV-29, FWV-33 MAIN STEAM SYSTEM:

Stm. Gen. Pres. Train 2 - Circuits to instruments MS-107-PT, MS-108-PT, MS-111-PT, MS-llZ-PT ELECTRICAL DISTRIBUTION SYSTEM: Train 2 - 480V ES Switchgear 38; Distribution Panel DPDP-5B; Circuits to 4kV Breakers 3206, 3220; Circuits to 480V Breaker 3310; Circuits to Distribution Panels DPDP-58, DPDP-6B; Circuits to ES MCC 381, 382, 383; Circuits to 480V UV MAKE-UP AND PURIFICATION SYSTEM:

Make-up Charging Paths Train 2 - Circuits to Pumps MVP-38, MU-3C, MVP-5C Letdown Isolation Train 2 - Circuits to MUV-49 SECONDARY PLANT INSTRUMENTATION:

Steam Gen. Level Train 2 - Circuits to instruments SP-18-DPT, SP-19-DPT, SP-22-DPT, SP-23-DPT, SP-26-DPT, SP-27-DPT, SP-30-DPT, SP-31-DPT CST Level Ind. Train 2 - Circuits to instrument CD-99-DPT

, FIRE AREA CC-124-116 (continued)

Safety Related Equipment Not Required for Safe Shutdown P

- ELECTRICAL DISTRIBUTION SYSTEM: Train B - Trays 124,148,149 for control power; circuits in l conduit Train AB- Circuits in conduit

! MAIN STEAM SYSTEM: Train AB- Circuits in conduit 1

CORE FLOOD SYSTEM: Train AB- Circuits in conduit SERVICE AIR SYSTEM: Train AB- Circuits in conduit Consequences of Design Basis Fire The ionization detectors will detect the products of combustion from an incipient fire and alert the control room for prompt response by the fire ,

brigade. The available fire fighting equipment is adequate to extinguish the jl design basis fire.

4 The low combustible loading, fire detection, and construction of the walls preclude the design basis fire from propagating to other fire areas.

i

! Loss of the above listed safe shutdown components may occur as a result of a design basis fire in this area with the exception of circuits to EFV-11, ,

EFV-32, MS-108-PT, MS-112-PT, SP-19-dPT, SP-23-dPT, SP-27-dPT, AND SP-31-dPT.

i These circuits will be protected in a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months rated fire enclosurehrap.

With the exception of the Emergency Feedwater System Train 1 of the above [

safe shutdown systems will be available for safe shutdown.

i For the Emergency Feedwater System (EF Flow Paths), Train 2 components may be [

lost as a result of a design basis fire. Circuits to valves EFV-11 and EFV-32

, are protected to enable the operator to shutdown Train 2 f f required. For :

! Train 1, power circuits to EFV-14 and EFV-33 may be lost. This will remove j the capability to close these normally open valves. Emergency feedwater flow t will be controlled through valves EFV-57 and EFV-58, therefore Train 1 is !

available for safe shutdown.

Train 2 of the Emergency Feedwater System (Main FW Isolation) is also

available.

i r

f i

28- !

---.._-,--._--,,,-,_.--.w.-,wnw, ,, ,,,m,,,_,,,. , , - -,,y, , .--__ ,,e__,_,.,,-,,,,,,,..y... ,.-.y_-,_.--,,-.,,-,,y, -

FIRE AREA CC-124-116 (continued)

CONCLUSION A design basis fire will not affect the capability to achieve and maintain cold shutdown. Administrative limits must be put in place to restrict the amount and type of transient combustibles in the area. The total combustible loading must not exceed 38,000 BTU's/sq. ft.

Thus, Impe11 believes upgrading the fire resistance rating of the ceiling is not warranted, and would not enhance the level of safety afforded to the public.

i FIRE AREA CC-124-117 480V ES Switchgear Bus Room 3A DEVIATION PROPOSED t

} Appendix R Section III.G.2.a requires separation of cables and equipment of

! redundant safe shutdown systems by a fire barrier having a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rating. Fire Area CC-124-117 in the Control Complex does not meet this criteria due to the construction of the ceiling, which separates this

,i elevation from the cable spreading room. The ceiling is constructed of steel plate on protected and unprotected structural steel with a 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months fire i resistant material on the top of the steel. Penetrations through the ceiling are sealed above the steel.

t A deviation from the above requirement is proposed due to the difficulty in i protecting the underside of the steel because of excessive interference by l cable trays, conduits, and equipment.

! This ceiling was previously accepted as a fire area barrier under the guidance

of Appendix A of Branch Technical Position 9.5.1 (Safety Evaluation by the i Office of Nuclear Reactor Regulation Supporting Amendment No. 23 to License j No. DPR-72 Docket No. 50-302, dated July 27, 1979 SER Section 5.12.6). Since

the previous acceptance, no new cable trays have been added in this area and the addition of cable to the existing trays has been minimal.

TECIGIICAL BASES FOR DEVIATION Combustible Material Quantity Cable (Note 1) 2214 lbs.

Fire loading - 37,517 BTU /sq ft

Maximum pemissible fire loading - 38,000 BTU /sq f t (Note 2)

Heat Rate - C/1100*F

! Maximum Scverity Fire - 28 minutes Note 1: The quantity of cable insulation called out above is based on 50%

i fill for all cable trays that are filled with cable up to 50% full by volume. For cable trays that are more than 50% full, the actual

percentage fill has been used. This is extremely conservative, since '

j very few trays are filled to greater than 50% and the actual plant

average tray fill is significantly lower.

Note 2: The maximum pemissible fire loading is based on an evenly

! distributed loading of combustible materials and is based upon the limitation of the steel ceiling construction.

i

~

a 4 FIRE AREA CC-124v117 (continued) 1 Design Basis Fire .

The maximum severity fire is based upon the 'E' curvb of the NFPA' Handbook (15th edition) which corresponds to the standards ^ of ASTM E-119 and NFPA-251.

Since the only combustible is IEEE-383 type cable, which through fire te.its has shown to have properties that limit the ability to sustain a' fire, the design basis fire is postulated to be a slow burning fire (equivalent to a 'C' curve fire) that reaches a maximum temperature of 1100*F.

The design basis fire is conservatively based on the simultaneous total combustion of all combustibles in the area. -

Fire Protection Equipment Fire fighting equipment in the area consists of 1 portable CO2 fire '

extinguisher. Portable extinguishers are also available in adjacent areas CC-124-111 and CC-124-116. In addition, ionization smoke detectors are located within the area provide an early warning alarm in the control room.

Construction >

All four walls and the floor,ere concrete with a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rating. The .

ceiling is steel plate on protected and unprotected structural steel with a 1 hour1.157407e-5 days 2.777778e-4 hours 1.653439e-6 weeks 3.805e-7 months rated directior,31 fire barrier from the top down.

A Class A fire door in the north wall accesses aria CC-124-111. Ventilation duct with 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire dampers communicates with area CC-124-111. Electrical -

and mechanical penetrations in the walls and floor of this fire area are '

provided with a 3, hour fire rated penetration seal. <

L Safe Shutdown Equipment Components listed below that are underlined will be protected in a 3 hour3.472222e-5 days 8.333333e-4 hours 4.960317e-6 weeks 1.1415e-6 months fire rated enclosure / wrap. ,

1 AIR HANDLING SYSTEM: 3 Reactor Bldg. Fans Train 1 - Circuits to fins AHF-1 A Diesel Gen. Room Fans Train ,1 - Circuits to fan M -22A EFIC Room HVAC Train 1 - CircuitsforfanKiF-54Ai\ '

Circuits to )um) CHP-1A; Circu1?,s to ;HNi-1A; C1rt:uits to valves CHV-108, CHV-113 \;

Control Complex WAC '

Train 1 - CircJiti to fans AHF-17A, AHF-19A, AriF-20A

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FIRE AREA CC-124-117 (continued)

Train 0 - Ductwork DECAY HEAT CLOSED CYCLE COOLING: Train 1 - Circuits to pump DCP-1A EMERGENCY FEEDWATER SYSTEM:

EF Flow Paths Train 1 - Circuits to pump EFP-1; Circuits to valves EFY-57, EFV-58 Train 2 - Circuits to valves EFV-11, EFV-32 Main FW Isolation Train 1 - Circuits to FWV-15 Train 3 - Circuits to valves FWV-30, FWV-36 ELECTRICAL DISTRIBUTION SYSTEM: Train 1 - 480V Switchgear 3A; Distribution Panel DPDP-5A; Circuits to 480V UV; Circuits to Breaker Cont. Power, 480V

. UV; Circuits to 4kV Breakers 3205, 3209, 3221; Circuits to 480V Breaker 3311; Circuits to distribution Panels DPDP-5A, DPDP-6A; Circuits to ES MCC 3A1, 3A2, 3A3, 3AB; Circuits to EGDG-1 A MAKE-UP AND PURIFICATION SYSTEM:

Charging Paths Train 1 - Circuits to pumps MVP-2A, MVP-3A, MVP-3B, MVP-4A, RUP'!K; Circuits to valve MUV-73 Letdown Isolation Train 1 - Circuits to valves MUV-40, MUV-41 NUCLEAR SERVICE CLOSED CYCLE COOLING WATER SYSTEM:

RB Fan Cooling Train 1 - Circuits to valve SWV-353A Safety Related Equipment Not Required for Safe Shutdown ELECTRICAL DISTRIBUTION SYSTEM: Train A - Trays 116,118,145,146,147, 562 for control power; circuits in conduit

FIRE AREA CC-124-117 (continued)

Train B - Circuits in conduit Train AB- Circuits.in conduit Consequences of Design Basis Fire The ionization detectors will detect the products of combustion from an incipient fire and alert the control room for prompt response by the fire brigade. The available fire fighting equipment is adequate to extinguish the design basis fire.

The low combustible loading, fire detection, and construction of the walls preclude the design basis fire from propagating to other fire areas.

With the exception of the Dnergency Feedwater System, Train 2 of the above safet shutdown systems will be available for safe shutdown.

A For the Emergency FeedwaterS S ystem (EF Flow Paths), Train 1 components may be lost as a result of a design basis fire. For Train 2, power circuits to EFV-11 and EFV-32 may be lost. This will remove the capability to close the normally open valves. Emergency Feedwater flow will be controlled through valves EFV-55 and EFV-56, therefore Train 2 is available for safe shutdown.

Train 2 of the Energency Feedwater System (Main FW Isolation) is also available.

CONCLUSION l A design basis fire will not affect the capability to achieve and maintain cold shutdown. Administrative limits must be put in place to restrict the amount and type of transient combustibles in the area. The total combustible loading must not exceed 38,000 BTV's/sq. ft.

i Thus, Impe11 believes upgrading the fire 7 51 stance rating of the ceiling is not warranted, and would not enhance th' l+ tel of safety afforded to the public.

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, -s ATTACHMENT 2 July 25, 1985 APPENDIX R EMERGENCY LIGHTING EVALUATION j

m y EMERGENCY LIGHTING REQUIREMENT (10 CFR 50, Appendix R, Section III.J.)

" Emergency lighting units with at least an 8-hour battery power supply shall be provided in all areas needed for operation of safe shutdown equipment and in access and egress routes thereto."

GUIDANCE (Generic Letter 85-01, Section 4.1)

The level of illumination provided by emergency lighting in access routes to and in areas where shutdown functions must be performed is a level that is sufficient to enable an operator to reach that area and perform the shutdown functions. At the remote shutdown panels the illumination levels should be sufficient for control panel operators.

EVALUATION A. EMERGENCY BATTERY PACK LIGHTING Procedures for shutdown in the event of a fire have been reviewed to determine what operations must be performed outside the main control room. These operations have been categorized as follows:

1) Required Operations,

2) Verification Operations,

3) Remedial Operations Required operations are those actions which must be taken to initiate or maintain shutdown operations according to the Appendix R design.

Emergency 8-hour battery pack lights have been installed to provide access to, egress from and lighting in areas where required operations will be performed.

Verification operations are actions taken as a matter of good practice, and include items such as independent verification of control rod insertion or turbine trip. These actions are not considered vital since the components necessary to achieve these functions are protected from the effects of fire. Emergency 8-hour battery pack lights are not provided for these operations by design. However, many of these operations are performed in areas where battery pack lighting is provided for required operations, or alternate lighting provisions are available.

Remedial . operations are those actions which may be taken to mitigate the effects of spurious operations. Spurious operations have been identified and evaluated; however, since their occurrence is highly unlikely, emergency 8-hour battery pack lighting has not been provided by design. Alternate lighting provisions are available for remedial operations.

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O B. ADDITIONAL EMERGENCY LIGHTING In addition to emergency 8-hour battery pack lights, areas throughout the Reactor, Auxiliary, Intermediate and Turbine Buildings are provided with normal plant lighting fixtures which are automatically supplied power from the emergency diesel generators in the event of loss of normal sources. These lights will be available to provide access / egress and operational lighting for verification and remedial operations.

C. DEDICATED HAND HELD LIGHTS Three storage locations are provided for dedicated hand held lights (flashlights). The storage locations are:

1) Near the Remote Shutdown Panel - Control Complex El. 108'

2) Near the elevator - Auxiliary Building El. 95'

3) Near the Condensate Demineralizers - Turbine Building El. 119' These lights are not to be used for any purpose except supplemental lighting in the event of a fire. These lights are included in the periodic preventative maintenance program under Preventative Maintenance Procedure PM-110, Miscellaneous Plant Batteries.

CONCLUSION

-The number and placement of 8-hour battery emergency lighting units is sufficient to provide access to, egress from, and illumination for operations, outside the main control room which are necessary for safe shutdown. Additional diesel backed emergency lights and hand held lights will provide illumination for verification and remedial operations which will be performed as a matter of good practice. This design meets or exceeds the requirements of 10 CFR 50, Appendix R, Section III.J., and provides a dependable emergency lighting system.

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.' ATTACHMENT 3

July 25, 1985 PROTECTION AGAINST SPURIOUS ACTUATION OF AUTOMATIC FIRE SUPPRESSION SYSTEMS l

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b PROTECTION AGAINST SPURIOUS ACTUATION OF AUTOMATIC FIRE SUPPRESSION SYSTEMS REQUIREENTS 10 CFR 50, Appendix A. General Design Criterion 3 "Firefighting systems shall be designed to assure that their rupture or inadvertant operation does not significantly impair the safety capability of (structures, systems or components important to safety)."

Branch Technical Position APCSB 9.5-1, 1976, Appendix A

" Failure or inadvertant operation of the fire suppression system should not incapacitate safety related systems or components."

Operating License # DPR-72, Amendment 23, July 27, 1979, Safety Evaluation Report, Section 4.3.1.7

" Fixed fire suppression systems have not been installed where their operation or failure could cause unacceptable damage to safety related equipment."

"The licensee will provide drip protection for safety-related motor control centers in areas where automatic sprinkler systems are installed."

EVALUATION Since the time that the Crystal River Unit 3 " Appendix A" Safety Evaluation Report was issued, the automatic fire suppression systems have been completely re-designed in order to comply with the separation requirements of 10 CFR 50, Appendix R. Compliance with the requirements listed above has been accomplished by the following methods.

1. The sprinkler system is seismically supported to preclude its falling down on equipment below.

2. It is a closed head system so that a fire will initiate a head opening only where the fire is located, or spurious operation will only occur at a single head.

3. Sprinkler head guards are placed on exposed heads in high traffic areas to protect them from accidental mechanical damage or actuation.

d. Conduits entering vertically into MCC's will have the space between the cable and the conduit plugged with a water-tight material.

i. Water flow alarms and isolation valves are located in each major sprinkler branch line to provide the ability to quickly identify and isolate spurious sprinkler operation.

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6. Safe shutdown power circuits originate from MCC's located on different fire area / building elevations so that any one fire or inadvertent sprinkler operation for that fire area / elevation would not affect both shutdown trains.

In summation, applicable regulations and requirements have been considered and where applicable incorporated into the design, installation, and testing of the present wet-pipe sprinkler system.

CONCLUSION The Crystal River Unit 3 fire protection design has located redundant safe shutdown components such that a single fire (and related suppression activities) will not impair the ability to safely shut down. Inadvertant actuation of a fire suppression system, alone, (without a fire) will also not ' impair the ability to safely shut down. This separation philosophy combined with the design features of the automatic fire suppression systems provide assurance that

'inadvertant actuation of a- fire suppression system ;s highly unlikely and will not cause unacceptable damage to systems or components important to safety.

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3F0785-31, Forwards Fire Protection Evaluations Re Fire Barrier Deviations,Emergency Lights & Protection Against Spurious Actuation of Automatic Fire Suppression Sys,For Review & Concurrence

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3F0785-31, Forwards Fire Protection Evaluations Re Fire Barrier Deviations,Emergency Lights & Protection Against Spurious Actuation of Automatic Fire Suppression Sys,For Review & Concurrence

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