ML19323C959
| ML19323C959 | |
| Person / Time | |
|---|---|
| Site: | Davis Besse  |
| Issue date: | 05/05/1979 |
| From: | TOLEDO EDISON CO. |
| To: | |
| Shared Package | |
| ML19323C951 | List: |
| References | |
| NUDOCS 8005190466 | |
| Download: ML19323C959 (22) | |
Text
{{#Wiki_filter:- -- - -- D-B 8006190466 DIRECTIONS FOR INSERTING REVISION 6 0F THE FIRE HAZARD ANALYSIS REPORT During insertion of the revised pages, a dash (-) in the remove or insert column of the directions means no action is required. REMOVE INSERT VOLUME I SECTION 5 5.D-13/14 5.D-13/14 5.D-17/18 5.D-17/18 5.D-19/19a 5.0-19/19a
- 5.D-19b/19c 5.D-19b/19b(1) f 5.D-19b(2)/19c
! 5.D-37 5.D-37 i 5.V-7/7a 5.V-7/7a l 5.V-7a(1)/7a(2) 5.V-15 5.V-15 VOLUME II APPENDIX I Drawing SK-1 Drawing SK-1 2 Drawing SK-2 Drawing SK-2 j Drawing SK-3 Drawing SK-3 Drawing SK-9 Drawing SK-9 Drawing SK-10 Drawing SK-10 l l Drawing SK-11 Drawing SK-ll f i i I 1
D-B flooding tank area, D-15 hatch Area 317, D-19 Passage No. 410, D-24 No. 2 main 6 steam line Area 602, D-25 No. 1 main steam line Area 601, and D-26 passage (west penetration area) on elevation 603'0" are of, or contained in structures which are concrete or masonry block, ceilings and floors are concrete, and all structural steel supporting members are protected with a 3-hour, fire-rated, sparyed-on-type fire proofing by Monokote as manufactured by the Zonolite Company using applicable UL designs to achieve a 3-hour fire rating. (Note area protected with fire-proofing. See drawings in Appendix 1.) The fire is not expected to propagate from the initial area of origin based on the following rationale: t
- a. All structural features are noncombustible. The structural features of the fire zones in fire area D and the type of construction will not support combustion, hence the walls, floors and ceilings are not considered to be a media which a fire can consume as a fuel source.
- b. Cables routed in conduit are not cousidered to be a fuel source for externally originated fires.
- c. The cabic tray system used at Davis-Besse is de-signed in such a way that the system traps the flame retardant gasses generated by the cables when hearad. These gasses inert the air space arcund the cables and preclude the cable fire from propagating or from becoming well established (see Section 4 Paragraph D.3.A on the cable tray system desigt-).
- d. The cable traf system in the auxiliary building, except for th( trays in the spent fuel pool area and the containment, are covered with Knowool blankets. Meta 3. tray covers were installed inside the containment 'o assure that R.G. 1.175 was met in all cases.
Based on the fire tests discussed in Section 6, a fire originating in a conduit or a cable tray from an overloaded cable is not credible. A fire of electrical origin is highly unlikely in the annulus space. The short lenghts (pigtails) of power cables that were supplied as part of the electrical penetration assembly pass through the annulus space. The pigtails are oversized in comparison to the cables to which they are connected. The connecting cables are amply sized to carry the connected 5.D-13 Revision 6
D-B load. In the unlikely event of a sustained overcurrent condition, the cabling external to the annulus space would fail prior to any overheating i of the oversized cable that passes through the annulus space. Therefore, the cabling in the annulus space is not a source of ignition. The reactor coolant pump motors each contain 225 gallons of oil in the bearing lubrication system. To contain any leakage, an enclosure has been installed around the oil cooler, fill pipe, and bearing lift pump. The enclosure has been designed to contain any oil from leakage or a pipe failure and drains to a collection tank. The exposed piping i ~ which is not enclosed within the oil collection tank enclosure is either not pressurized (e.g., it is drain piping) or it is sleeved. 2 A fire originating within a fire zone in fire area D is not expected to propagate or extend from the zone of origin. The boundaries of fire Area D are fire rated for 3 hours. Access Door (3) 100 and 101 on elevation 545'0", 205 and 201A on elevation 565' 0", 426, 426A, and 402 on elevation 603'0", and doors 602, 601 and 606 on elevation 643'0" leading into the area are Class A type fire door and opening assemblies. Where mechanical piping, cable trays, and conduit penetrate fire barriers (see Dwgs. A-3 through A-8) the penetration blockouts are filled with a minimum of 12 inches of a , silicone foam fire stop material in order to maintain the 3-hour fire i resistance rating of the barrier. Tpylically, where HVAC ducting i penetrates through a fire barrier, the blockout which the ducting passes through is either grouted with cellular concrete or filled with 1 a minimum of 12 inches of a silicone foam fire stop material. In order to maintain the fire resistive integrity of the fire area D boundary walls, the blowout panel located in the wall between No. 2 mechanical penetration room and boric acid evaporator Room 235, a water curtain is proposed to be installed (see Section 5.G.6). On elevation 585'0", a water curtain is proposed to be installed on the blowout panels located in the wall between heater bay Area 326 and No. 4 mechanical penetration Room 314 in order to maintain the fire area D boundary fire resistive integrity (see Section 5.D.6). 5.D.5 Fire Detection The fire detection inside the containment consists of ten ionization-type detectors and of these ten, five ionization-type detectors are designed to operate in a high radiation environment. These detectors are installed within the two steam generator compartments above each reactor coolant pump motor and the pressurizer heater bundles (see Dwg. A-6). The general containment area fire detection is provided by five ionization-type detectors which are mounted in the MVAC ducts to sample the supply, exhaust and recirculation air. i The fire detection installed in annulus consists of four ionization detectors mounted around the perifery of containment vessel on elevation 774'-0" between ' the containment and shield building. These detectors mount.2 in the annulus will only detect a fire that is capable of inducing convection currents within the annulus space. These combustion particules caused by the fire will be
- transported by convection currents upward to the detector and cause the detector 5.D-14 Revision 2 1
D-B i Tn preclude an oil spill and/or a pressure type fire, an oil collection system was installed on each reactor coolant pump as discussed in Section 5.D.8.2 The fire suppression capabilities in the containment rely on manual fire-fighting action. Portable fire suppression equipment in the form of four 20-1b., multipurpose dry chemical, and five 15-lb, CO2hand portable fire extinguishers are located near hazard areas and at access points to these areas (see Dwg. A-4 thru A-8). In addition to the hand portable fire extinguishers inside the containment, there are two 150-1b ordinary dry chemical, wheeled fire extinguishers, equipped with 50 feet of 3/4 inch hose and a smooth bore-type nozzle. One of these wheeled-type fire extinguishers is stored under the northeast stairs near the elevator on elevation 565'-0", and the other is stored in Pacsage 410 near the stairs on elevation 603'-0" (see Dwgs A-4 and A-6). During periods of refueling and maintenance inside the containment, a 2-1/2-inch supply hose line can be connected to the fire department connection at Hose Station (HCR) 27 (see Dwg. A-6) and brought into the containment by overriding the personnel air lock access door. The 2-1/2-inch supply line can be layed to the area inside the containment where the maintenance operation is being performed, then this 2-1/2-inch supply hose line can be wyed off with a 2-1/2-inch to two 1-1/2-inch gated wye hose fitting and two 100-foot, 1-1/2-inch hand fire hose lines with adjustable fog nozzles can be attached to the wye. The 2-1/2-inch supply hose line will be charged with water and maintained in a standby condition. In the event that a fire should cccur in this area where the maintenance is being performed, the 1-1/2-inch hand hose line can be readily manned and then activated by opening the gated wye hose fitting on the end of the 2-1/2-inch supply hose line. As discussed in Section 5.D.8.1, the probability that a fire will originate and/or propagate inside the annulus is not credible. The fire suppression in the annulus space relies on portable fire suppression equipment in the form of hand portable extinguishers. Hand portable fire extingui hers in the form of 15-1b CO2 type and 20-1b multipurpose dry hemical type units are located in the rechanical equipment rooms near the access points into the annulus space (see Dwg. A-5 and A-6). Manual fire suppression capabilities in No 1 Mechanical Penetration Room 208 ! consist of portable fire suppression equipment in the form of one 15-lb, CO l hand portable fire extinguisher located in this room. Two additional 15-1b,2 t CO 2 hand portable fire extinguishers are directly accessible to Rocm 208 from 6 I Corridor 209. A hose line from Hose Station (HCS) 22, located in Corridor J 209, can be layed across the corridor and through Door 201A into No. ; 1 Mechanical Penetration Room 208 to provide manual water fire sup- l pression (see Dwu. A-4). ' l l . l l \ l 5.D-17 Revision 6 1 l
r D-B Manual fire suppression equipment in the No. 2 Mechanical Penetration Room consists of one 15 lb CO hand portable fire extinguisher. Three additional 6 15-lb. CO, hand portable2 fire extinguishers are directly accessible to Room 236 from Passage 227. A hose line from Hose Station (HCS) 21, located in Passage 227, can be layed to the north end of the passage through Door 205 into No. 2 Mechanical Penetration Room 236 to provide manual water fire suppression (see Dwg. A-4) . Manual fire suppression capabilities in No. 3 Mechanical Penetration Room 303 consist of portable fire suppression equipment in the form of one 6 20-lb multipurpose dry chemical, hand portable fire extinguisher and Hose Station (HCS) 38 located in this room. If Hose Station (HCS) 38 and the portable fire extinguisher are rendered inoperable due to a fire in the area, additional hand portable fire extinguishers in the form of one 15-lb CO hand portable fire extinguisher from Corridor 304 and another 15-lb CO type extinguisher from Fuel Handling Area 300 are directly accessible o Room 303. In the event that backup water fire suppression is required, a hose line from Hose Station (HCS) 25, located in Fuel Handling Area 300, can be layed through Door 306 across corridor 304 through Door 307 into No. 3 Mechanical Penetration Room 303 (see Dwg. A-5). Manual fire suppression capabilities in No. 4 Mechanical Penetration Room 314 consist of portable fire suppression equipment in the form of two 20-lb, 6 multipurpose dry chemical hand portable fire extinguishers and Hose Station (HCS) 36 located in this room. If Hose Station (HCS) 36 and the hand' portable fire extinguishers are rendered inoperable due to a tire in the area, additional hand portable fire extinguishers in the form of two 15-lb CO 2 fire extinguishers, located in Corridor 304, are directly accessible 1 to Room 314 In the event that backup water fire suppression is required a hose line from Hose Station (HCS) 24, located in Passage 310, can be layed through Door 309, into Corridor 304, then through Door 308 into No. 4 Mechanical Penetration Room 314 (see Dwg. A-5). Manual fire suppression capabilities in No. 2 Electrical Penetration Room 6 427 consist of portable fire suppression equipment available in or adiacent to the area. The fire suppression equipment in the No. 2 Electrical Pen-etration Room consists of one 15-lb C0 fire extinguisher. Two additional (one 15-1b CO 2 and one 20-lb) multipurhose dry chemical fire extinguishers located in Corridor 411 are directly accessible to Room 427. A hose line from Hose Station (HCR) 27, located in Corridor 411, can be layed to the northeast end of the corridor through Door 426 into No. 2 Electrical Penetration Room 427 to provide manual water fire suppression (see Dwg. A-6). 5.D-18 Revision 6 i e _ l
D-B Additional hand portable fire extinguishers are proposed to be installed in Mechanical Penetration Rooms 236, 208, 303, 314 and in Electrical Penetration Room 427. 3ased on the effects that a postulated fire may have on No. 4 Mechanical Penetration Room 314, as discussed in Section 5.D.8, sprinklers and an automatic water curtain to protect the blowout panel openings in the turbine-auxiliary building wall are proposed to be installed. The system will be an area-type automatic sprinkler system. This system will be designed in such a manner as to l reduce the probabilities that a single fire originating in the area l could affect the ability to achieve cold shutdown. With respect to a l fire originating from a cable overload, the cable will not provide a ; source of fire nor self-ignite surrounding cables. As discussed in ; Secticu 6, it is shown that such a fire originating in a cable tray is not credible. Based on this rationale, a sprinkler system for the purpose of spraying the trays is not going to be incorporated into the design. Mechanical Penetration Room No. 4 will be protected against an exposure fire by an automatic wet pipe-type sprinkler system. The sprinkler piping will be sized hydraulically in accordance with the rea.uirements of NFPA
- 13. l6
. The system will be designed so that a single failure of an alarm check valve, OS & Y control valve, or a fire water supply header to the sprinkler system will not adversely affect the operation of the sprinkler system under emer-gency fire conditions. The system design incorporates redundant fire water sprinkler supply headers; redundant alarm check valves and trim sets; redundant OS & Y system control valves; and a typical commercial sprinkler riser, feeder, branch line piping, and fusible link-type sprinkler head arrangement. 2 The alarm check and OS & Y sprinkler control valves will be located in separate rooms in such a manner that a common fire will not affect both control valves. One of the redundant OS & Y sprinkler control valves and its associated alarm check valve will be located in Heater Bay Ares 326 (Fire Zone II-10) and the other in Corridor 304 (Fire Zone V-6) Fire water will be supplied to the OS & Y sprinkler control valve and its associated alarm check valve, located in Corridor 304, from the 10-inch fire water auxiliary building supply header. The redundant OS & Y sprinkler control valve and its associated alarm check valve is supplied fire water from the 10-inch turbine building fire water loop. The water supply to the 10-inch fire water auxiliary building supply header and the 10-inch turbine building fire water loop is fed from two separate directions (see Appendix 1, Dwg SK-2 for supply piping and control valve layout). If a fire were to become established in Mechanical Penetration Room No. 4, the heat that would be produced would fuse a sprinkler head or heads, depending on the size of the fire, thus causing water to flow directly from the sprinkler 5.D-19 Revision 6
D-B head (s) af fected by the fire. The redundant alarm check valve clappers will l open by the flow and allow pressurized water to fill the retarding chambers i associated with each alarm check valve. The water flow will overcome the ' retarding chambers small capacity drain and thus fill the alarm line which closes the associated alarm check valve's pressure switch. The closing of the pressure switch will activate a local, audible fire alarm. The pressure switch closure, which indicated a water flow condition, will be visually and audibly annunciated in the control room. The pressure switch signal contact points and its circuits will be designed and installed so that they cannot be readily tampered with or removed without causing a trouble signal to be produced. This system trouble condition will sound a local, sadible alarm and will sound an audible alarm and be visually annunciated in the control room. The OS & Y sprinkler control valves will be electrically supervised to obtain two separato and distinctive signals one indicating movement of the valve from its normal position and the other indicating restoration of the valve to its normal position. Water-sensitive electrical equipment, located in Mechanical Penetration Room No. 4 will be evaluated in such a manner, that baffles will be prcvided to protect against water coming in contact with such equipment. This assures that both advertant and inadvertant operation of the sprinkler system will not render sensitive electrical equipment inoperable. Th3 interior blowout steam line vent openings, located in the turbine-auxiliary building wall separating Mechanical Penetration Room 314 from the heater bay, 2 will be protected by an automatic water curtain-type sprinkler system applied to both sides of the wall. This type of system will decrease the probabilities that a fire originating on one side of the wall will traverse to an area on the opposite side of the wall. The water curtain system will be designed so that a single failure of the deluge control valve or system actuation devices (detectors) will not adversely affect the operation of the water curtain system under emergency fire conditions. The system design incorporated redundant deluge control valves, redundant detection and actuation circuits, typical commercial sprinkler piping, and an open sidewall and window sprinkler head arrangement (see Appendix 1, Dwgs SK-7A, B, and C for sprinkler head placement details). One of the redundant deluge water curtain control valves will be located in lleater Bay Area 326, elevation 585'-0", and the other in No. 4 Mechanical Penetration Room 314. Fire water will be supplied to the deluge water curtain control valve located in No. 4 Mechanical Penetration Room 314 from the lO-inch fire water auxiliary building supply header. The redundant deluge water curtain control valva located in the heater bay is supplied fire water from the turbine bufiding 5.D-19a Revision 2 l2
D-B fire water loop. The water supply to the 10-inch fire water auxiliary building supply header and the turbine building fire water loop is fed from two separate directions (see Appendix 1, Dwg SK-2 for supply piping and control valve layout). The deluge control valves will be actuated by a thermal detection and actua-tion circuit. The rate-compensated type heat detectors will be installed in accordance with the requirements of NFPA 72E and the manufacturer's recom-mended installation instructions. These detectors will also activate a local, audible fire alarm. The heat detector circuits will be an electri-cally supervised Class A-type circuit. Additional contact points in each system control panel will be provided for remote visual and audible annuncia-tion of fire and/or trouble alarms in the control room. During emergency fire conditions, the heat generated by the fire will be sensed by the rate-compensated thermal detectors. Once the thermal set point of the rate-compensated thermal detector is reached the circuit is 2 completed and the system control panel activates the water curtain deluge system control valve. The activation of either deluge control valve will admit water into the sprinkler system piping. Water will then be discharged from the sprinkler heads on both sides of the wall directly onto the V-beam blowout panels (see Appendix 1, Dwgs. SK-7A, B, and C for typical sprinkler head locations). I Water is applied to both sides of each blowout panel and opening by utilizing a total of six open sprinkler heads. Three nozzles will be positioned on each side of the wall in such a manner that the combined use of window and sidewall sprinkler heads and their water distribution patterns will provide a constant flow of water down both sides of the V-beam blowout panels and spray 100 sq. ft. of floor area directly adjacent to each of the blowout panel openings. l A detailed fire hazards analysis was performed to determine the potential of damage to the auxiliary building in the event of a single fire in either the No. 2 Mechanical Penetration Room (Room 236), No. 1 Mechanical Penetration Room (Room 208), No. 3 Mechanical Penetration Room (Room 303), No. 2 Electrical Penetration Room (Room 427). Inasmuch as these rooms have a limited free structural steel expansion capability the imposition of forces from the resulting expansion could have adverse effects on the remaining portions of the auxiliary building. The maximum thermal expansion could be exceeded should the fire be postulated at the base of almost any system of unprotected structural elements within the building. 6 A fire of this nature is considered to be extremely conservative and is not anticipated due to the fire propagation control features discussed in Section 5.D.4 and the early warning capabilities of the proposed fire detection system. Structural damage is not expected; however, since structural damage to the remaining portions of the auxiliary building resulting from structural steel expansion in any one of these rooms cannot be precisely evaluated, in order to minimize the potential for damage, the structural steel in these rooms were to be fireproofed with a sprayed on coating. 5.D-19b Revision 6l2
3-B i However, due to the congestion and location of equipment, piping, and cond.its in relation to the structural steel, the application methods of the spray on fire proofing material, the adhesion problems of the material to existing painted surfaces, and the corrosion potential of the fireproofing material to aluminum and stainless steel surfaces makes fire proofing no longer feasible in these rooms. Only portions of one room, No. 1 Electrical Penetration Room (Room 402) can be adequately protected by structural steel spray on fire proofing and the remaining unprotected area of the room will be protected by automatic sprinklers. (see Dwg SK-ll). l Based on the effects that a postulated fire may have on unprotected structural steel components in No. 2 Mechanical Penetration Room (Room 236), No. 1 Mechanical Penetration Room (Room 208), No. 3 Mechanical Penetration Room (Room 303) and No. 2 Electrical Penetration Room (Room 427), automatic sprinklers at or near the ceiling elevation will be installed in these rooms. This additional sprinkler protection has distinct advantages over a passive fire i proofing philosophy as follows:
- a. An active system will suppress or control a fire until manual fire fighting action can be taken. Thus sprinkler protection will limit fire growth and reduce the amount of property damage experienced by the structure.
6
- b. An active system will limit the thermal growth of the structural steel by application of water to structural members and by cooling the atmosphere directly around structural steel supporting members.
No. 1 Mechanical Penetration Room (Room 208), No. 2 Mechanical Penetration Room (Room 236), No. 3 Mechanical Penetration Room (Room 303), No. 1 Electrical Penetration Room (Room 402), and No. 2 Electrical Penetration Room (Room 427)
; will be protected against an exposure fire by automatic wet pipe sprinkler i
systems. These sprinkler systems will be sized hydraulically in accordance with the requirements of NFPA 13. Each sprinkler system design incorporates a fire water sprinkler supply header; i alarm check valve and trim set; OS&Y system control valve and a typical com-mercial sprinkler riser, feeder, branch line piping, and sprinkler head arrangemer.t. 5.D-19b(1) Revision 6 [
D-B If a fire were to become established in the No. 1, No. 2, or No. 3 Mechanical Penetration Room or the No. 2 Electrical Penetration Room or the area adjacent to door 403 in the No. 1 Electrical Penetration Room, the heat that would be produced would fuse a sprinkler head or heads, depending on the size of the fire, thus causing water to flow directly from the sprinkler heads affected by the fire The alarm check valve clapper will be opened by the flew and allow pressurized water to fill the retarding chamber associated with the valve. The water flow will overcome the retarding chamber's small capacity drain and, thus, fill the alarm line which cloces the associated alarm check valve's pressure switch. The closing of the pressure switch will activate a local audible fire alarm. The pressure switch closure, which indicates a water , flow condition, will be visually and audibly annunciated in the control room. The pressure switch signal contact points and its circuits will be designed causing a trouble signal to be produced. This system trouble condition will sound a local, audible alarm and will sound an audible alarm and be visually annunciated in the control room. 6 Each OS&Y sprinkler control valve will be electrically supervised to obtain two separate and distinctive signals; one indicating movement of the valve f rom its normal position and the other indicating restoration of the valve to its normal position. Water-sensitive electrical equipment, located in these rooms will be evaluated in such a manner that baffles will be provided to protect against water coming in contact with such equipment. This assures that both advertant and inadvertant operation of the sprinkler system will not render sansitive electrical equipment inoperable. 5.D.7 Isolation and Smoke Venting The containment purge exhaust fan (C3) could remove smoke from the penetration i rooms (Rooms 236, 208, 314, 303, 427, and 402) and the annulus. In conjunction with the containment purge supply fan (C2), smoke could be removed from the containment (Rooms 217, 218, 220, 219, 213, 216, 215, 214, 316, 219, 315, 317, 410, 407, 701, and 700). The system has no fire dampers to reset for a postulated smoke removal mode. There is little system ductwork, since wall openings and rooms are used for air flow paths. The system contains a prefilter and an absolute (HEPA) filter in the exhaust fan suction. They would reduce smoke removal efficiency as the smoke particles , built up on the filters, thus increasing static fan pressure. There is an advantage to the filters, in that during its short useful smoke removal life any airborne particulates would not be released to the atmosphere. The air flow rates from the penetration rooms may be insufficient to affect adequate smoke removal, therefore, portable equipment would be utilized to remove smoke from these rooms. Smoke would be removed from Room 427 through 5.D-19b(2) Revision 6 l6
D-B Doors 426A and 427 to the heater bay area of the turbine _ building and subse-quently to the atmosphere through the turbine building ventilation system. Smoke would be removed from Room 402 through Door 403 to Room 400 for removal by the fuel handling area exhaust system (see Section 5.V.7.1). Smoke would be removed from Room 303 through Doors 307 and 306 to Room 300 for removal by the fuel handling area exhaust system. Smoke would be removed from Room 314 through Doors 308 and 309 to Room 310 for removal by the radwaste area exhaust system (see Section 5.U.7). Smoke would be removed from Room 208 through Door 201A to Room 200 for removal by the radwaste area exhaust system (see Section 5.H.7.3). Smoke would be removed from Room 236 through Door 205 to Room 233 for removal by the radwaste area exhaust system (see Section 5.A.7.1). l 5.D-19e Revision 2 2
D-B 5.D.9.2 Install 8-hour battery pack lights for the following rooms: Fire Zone D-10, Room 236 Fire Zone D-11, Room 208 Fire Zone D-16, Room 314 Fire Zone D-17, Room 303 Fire Zone D-18, Rocm 427 Fire Zone D-21, Room 402 Fire Zone D-24, Room 602 Fire Zone D-25, Rooms 600 and 601 5.D.9.3 Make portable communication equipment available for the following rooms: Fire Zone D-11, Room 208 Fire Zone D-16, Room 314 Fire Zone D-17, Room 303 Fire Zone D-18, Room 427 Fire Zone D-21, Room 402 Fire Zone D-24, Room 602 Fire Zone D-25, Rooms 600 and 601 5.D.9.4 Install automatic fire suppression in the form of wet pipe sprinklers in the following rooms: Fire Zone D-lO, Room 236 6 Fire Zone D-ll, Room 208 Fire Zone D-16, Room 314 Fire Zone D-17, Room 303 6 Fire Zone D-18, Room 427 i 5.D.9.5 Install additional hand portable fire extinguishers in the following rooms: Fire Zone D-10, Room 236 Fire Zone D-ll, Room 208 Fire Zone D-17, Room 303 Fire Zone D-16, Room 314 Fire Zone D-18, Room 427 5.D.9.6 Install an automatic water curtain between Room 314 and the heater bay area of the turbine building. 5.D.9.7 Install an automatic sprinkler system in Room 402 which will provide partial 6 room sprinkler protection'for'the area adjacent to Door 403. l l l l l l l t i f ! 5.D.37 Revision 6 i l t
1 D-B Based on the effects that a postulated fire may have on Corridor 304, as dis-cussed in Section 5.V.8, sprinklers are proposed to be installed. The system will be an area-type automatic sprinkler system. This system will be designed in such a manner as to reduce the probabilities that a single fire originating-in the area could affect the ability to achieve cold shutdown. With respect to a fire originating from a cable overload, the cable will not provide a source of fire nor self-ignite surrounding cables. As discussed in Section 6, it is shown that such a fire originating in a cable tray is not credible. Based on this rationale, a sprinkler system for the purpose of spraying the trays is not going to be incorporated into the design. Corridor 304 (Fire Zone V-6) w'll be protected against an exposure fire by an automatic wet pipe-type sprink. system. The sprinkler piping will be sized hydraulically in accordance with the requirements of NFPA 13 and 15. As an alternate to providing a 1/2-hour rated barrier for protection of the cabling discussed in Section 5.V.8.2, the system will be designed so that a single failure of an alarm check valve, OS & Y control valve, or a fire water supply header to the sprinkler system will not adversely affect the operation of the sprinkler system under emergency fire conditions. The system design incorporates redundant fire water sprinkler supply headers; redundant alarm check valves and trim sets; redundant OS & Y system control valves; and a typical commercial sprinkler riser, feeder, branch line piping, and fusible link-type sprinkler head arrangement. The alarm check and OS & Y sprinkler control valves will be located in separate rooms in such a manner that a common fire will not affect both control valves. 3 One of the redundant OS & Y sprinkler control valves and its associated alarm check valve will be located in Mechanical Penetration Room No. 4 and the other in Mechanical Pentration Room No. 3. Water will be fed to each OS & Y sprinkler control valve and its associated alarm check valve from the 10-inch fire water auxiliary building supply header. This supply header is supplied water from the underground fire water yard loop. The water supply to the 10-inch fire water auxiliary building supply header is fed from two separate directions (see Appendix 1 Drawing SK-2, for supply piping and-control valve' layout). If a fire were to become established in Corridor 304 (Fire Zone V-6), the heat that would be produced would fuse 'a sprinkler head or heads, depending on the size of the fire, thus causing water to flow directly from the sprinkler head (s) 'affected by the fire. The redundant alarm - check valve clappers will open by the flow and allow pressurized water to fill the retarding chambers associated with each alarm check valve. The water flow will overcome the retarding chamber's small capacity drain and, thus, fill the alarm line which closes the associated alarm check valve's pressure switch. The closing of the pressure _ switch will activate a local audible fire alarm. The pressure! switch closure which indicates a water flow condition will be visually and audibly annunciated in the control room. 5.V -Revision 3 i l
f D-B The pressure switch signal contact points and its circuits will be designed and installed so that they cannot be readily tampered with or removed without causing a trouble signal to be produced. This system trouble condition will sound a local audible alarm and will also sound an audible alarm and be visually annunciated in the control room. The OS & Y sprinkler control valves will be electrically supervised to obtain two separate and distinctive signals; one indicating movement or the valve from its normal position and the other indicating restoration of 3 the valve to its normal position. Water-scusitive electrical equipment located in Corridor 304 will be evaluated in such a manner that baffles will be provided to protect against water coming in contact with such equipment. This assures that both advertant and inadvertant operation of the sprinkler system will not render sensitive electrical equipment inoperable. A detailed fire hazards analysis was performed to determine the potential of damage to the auxiliary building in the event of a single fire in the storage room (Room 405). Fire Zone V-10. Inasmuch as this room has a limited free structural steel expansion capability, the imposition of forces from the resulting expansion could l have adverse effects on the remaining portions of the auxiliary building. The maximum thermal expansion could be exceeded should the fire be postulated at the base of almost any system of unprotected structural elements within the building. A fire of this nature is considered to be extremely conservative and is not anticipated due to the fire propagation control features discussed in 6 Section 5.V.4., and the early warning capabilities of the proposed fire detection system. Structural damage is not exn'cted; however, since structural damage to the remaining protions of the auxili-cy building resulting from structural steel expansion in this room cannot be precisely evaluated, in order to minimize the potential for damage the structural steel in this room was going to be fireproofed with a sprayed-on coating, llowever, due to the congestion and location of equipment and conduits in relation to the structural steel, the application methods of the spray on fire proofing material, , the adhesion problems of the material to existing painted surfaces, and the corrosion ' potential of the fireproofing material to aluminum surfaces makes fire proofing no longer feasible in this room. Based on the effects that a postulated fire may have on unprotected structural steel components in the storage room (Room 405), automatic sprinklers at or near the ceiling elevation will be installed in this room. This additional sprinkler protection has distinct advantages over a passive fire proofing philosophy as follows: l l l 5.V-7a Revision 6 3
D-3
- a. An active _ system will suppress or control-a fire until manual fire fighting action can be taken. Thus sprinkler protection will limit fire growth and reduce the amount of property damage experienced by the structure.
- b. An active system will limit the thermal growth of the structural steel by application of water to structural members and by cooling the atmosphere directly around structural steel supporting members.
The storage room (Room 405) will be protected against an exposure fire by an automatic wet pipe sprinkler system. This sprinkler system will be sized hydraulically in accordance with the requirements of NFPA 13. The sprinkler system design incorporates: a fire water sprinkler supply header; alarm check valve and trim set; OS&Y system control valve and a typical commercial sprinkler riser, feeder, branch line piping, and sprinkler head arrangement.
- If a fire were to become established in the storage room (Room 405) (Fire Zone V-10), the heat that would be produced would fuse a sprinkler head or heads, depending on the size of the fire, thus causing water to flow directly from the sprinkler heads affected by the fire. The alarm check valve clapper will be opened by the flow and allow pressurized water to' fill the retarding chamber associated with the valve. The water flow will overcome the retarding chamber's 6 small capacity drain, and, thus, fill the alarm line which closes the associated alarm check valve's pressure switch. The closing of the pressure switch will activate a local audible fire alarm. The pressure switch closure, which indicates a water flow condition, will be visually and audibly annunciated ,in-the control room. The pressure switch signal contact points and its circuits will be designed and installed so that they cannot be readily tampered with or removed without causing a trouble signal to be produced. This system trouble condition will sound a local, audible alarm and will sound an audible alarm and be visually annunciated in the control room.
The OS&Y sprinkler control valve will be electrically supervised to obtain two separate and distinctive signals; one indicating movement of the valve from its normal' position and .the other indicating restoration of the valve to its normal position. . Water-sensitive electrical equipment, located in the storage' room (Room 405) will be evaulated in such a manner;that baffles will be provided to protect-against water coming in contact:with such equipment. This assures that both advertant and inadvertant operation of the sprinkler system will not render sensitive electrical' equipment inoperable. 6 5.V-7a (1) ~ Revision 61
D-B 5.V.7 Isolation and Smoke Venting 5.V.7.1 Fire Zones V-1, Fuel Handling Area (Room 300); V-2, Decon Area (Room 305); V-3, New Fuel Storage Area (Room 306); V-4, Drum Storage Area (Room 300B); V-8, Passage (Room 400); V-9, Corridor (Room 404) These firc zones are served by the 20,000 cfm capacity (per fan) fuel handling area exhaust system. In conjunction with either of the main exhaust fans (C19-1 and 2), either of the two 100 percent capacity fuel handling area exhaust fans (C18-1 and 2) could remove smoke from Room 300. A 3-hour rated fire damper in the exhaust air flow path is located in the ductwork wall penetration between Room 300 and Room 501. This damper may have to be reset for smoke removal. The system contains a prefilter and an absolute (HEPA) filter before the , exhaust fan suction. These would reduce smoke removal efficiency as' the smoke particles collected on the filters, thus increasing system static fan pressure. During the filter's short useful life, airborne particulate contaminates would not be released. A thermal switch between the filters and the fan suction could shut down the fan with elevated inlet temperatures. 5.V.7.2 Fire Zones V-5, Drumming Area (Room 302); V-10, Storage (Room 405); V-ll, Hot Instrument Shop (Room 406) These fire zones are served by the radwaste area exhaust system. As discussed in sc;tf on 5. A.7.1, this system could be utilized for smoke removal from these rooms. The return air flow rates are 300 cfm for the storage room, 600 cfm for the hot instrument shop, and 1425 cfm for the drumming area. 5.V.7.3 Fire Zones V-6, Corrido'r (Room 304); V-7, Fuel Handling Exhaust Unit Room (Room 401) These fire zones do not have installed exhaust ventilr, tion systems. Smoke removal from these fire zones will be accomplished by utilizing portable 6 5.V-7a(2) Revision 6
D-B Lighting could be lost in the following rooms due to a fire in the rooms; therefore eight hour battery pack lights will be provided:
- a. Fire Zone V-ll, Room 406 5.V.9 Modifications 5.V.9.1 Install additional fire detection for the following rooms:
. Fire Zone V-1, 300 Fire Zone V-6, 304 Fire Zone V-8, 400 Fire Zone V-9, 404 5.V.9.2 Instr 11 additional fire extinguishers for the following rooms:
Fire Zone V-1, Room 300 5.V.9.3 Install B-hour battery pack lights for the following rooms: Fire Zone V-7, Room 401 (see Section 5.D.8.13) Fire Zone V-1, Room 300 Fire Zone V-6, Room 304 Fire Zone V-9, Room 404 Fire Zone V-10, Room 405 Fire Zone V-ll, Room 406 5.V.9.4 Install an automatic sprinkler system for the following rooms: Fire Zone V-6, Room 304 Fire Zone V-10, Room 405 5.V.9.5 Make portable communication equipment available for the following rooms: Fire Zone V-1, Room 300 Fire Zone V-6, Room 304 Fire Zone V-9, Room 404 1 1 5.V-15 Revision 6
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1 SK-11 - l FIRE DETECTION ARRANGEMENT-f' - - ELECTRICAL PENETRATION ROOMS 1 l
--q AND 2 ELEVATION 603 FEET -
x REVISION 6 7 i 8 9 10 l 11 12 j 13 14 i l l l l}}