ML18038A176

Forwards Changes to FSAR Sections 9.5.1 & 9A.3 Re Fire Protection Program Carbon Dioxide Sys,For Approval.Changes Remove Commitment to Use CO2 in nonsafety-related Areas.Fsar Will Be Amended in Future.W/Three Oversize Encls

ML18038A176
Person / Time
Site:	Nine Mile Point
Issue date:	06/26/1986
From:	Mangan C NIAGARA MOHAWK POWER CORP.
To:	Adensam E Office of Nuclear Reactor Regulation
References
(NMP2L-0758), (NMP2L-758), NUDOCS 8607070388
Download: ML18038A176 (21)

Text

{{#Wiki_filter:REQUL ORY INFOR~)1ATION DISTRIBUTE BYBTEN (RIDB)'CCESSION NBR: 8607070388 DQC.DATE: 86/06/26 NOTARIZED: YEB DOCKET 0 FACIL: 50-410 Nine Nile Point Nuclear Station>Unit 2>Niagara aloha 05000410 AUTH.NANE AUTHOR AFFILI ATION NANGAN>C.V.Niagav a Nohawl: Power Cov p.RECIP NANE RECIPIENT AFFILIATION ADENSAN>E.Q.BllR Pv object Div ectov ate 3

SUBJECT:

Forwards changes to FBAR Sections 9.5.1 8c 9A.3 v'e f iv e pv otection pv ogv'am cav bon dioxide sos>fov appl oYal.Changes v emove c ommi tment to use CQ2 in nonsa f et'-related av'eas.FBAR will be amended in future.lJ/three oversize encls.DISTRIBUTION CODE: B002D COPIES RECEIVED: LTR ENCL SI ZE: TITLE: I icensing Submittal: Fire Protection NOTES: REC IP lENT ID CODE/MANE BWR ADTS 0/JR PD3 PD CQP IEB LTTR ENCL 1 1 RECIP I ENT ID CODE/NANE BWR PD3 LA HAUQHEY>N 01 COP IES LTTR ENCL 1 0 1 1 INTERNAL: ACRB ELD/HDB3 10 04 6 6 1 0 1 ADN/LFNB NRR STANQ>J RQNi 1 0 3 3 1 EXTERNAL LPDR NSIC 03 05 1'RC PDR 1 1 02 TOTAL NUNBER OF COPIES REQUIRED: LTTR 20 ENCL 17 0 S f1 il NIAGARA MOHAWK POWER CORPORATION/300 ERIE BOULEVARD WEST, SYRACUSE.N,Y.13202/TELEPHONE (315)474-1511 t June 25, 1986 (NMP2L 0758)Ms.Elinor G.Adensam, Director BWR Project Directorate No.3 U.S.Nuclear Regulatory Commission 7920 Norfolk Avenue Washington, DC 20555

Dear Ms.Adensam:

Re: Nine Mile Point Unit 2 Docket No.50-410 The Nine Mile Point Unit 2 Final Safety Analysis Report describes the Fire Protection Program.Carbon dioxide systems are installed in both safety related and nonsafety related areas as described in Sections 9.5.1.and 9A.3.Carbon dioxide systems will comply with NFPA Standard 12 for safety related areas.Preoperational testing of the four C02 systems in safety related switchgear rooms is complete and accepted.The safety related rooms are poured in place concrete structures, while the nonsafety related rooms use masonary walls.During the testing of C02 systems in the safety related areas, as expected, a positive pressure occurred in the rooms in order to meet NFPA 12 concentrations. These pressures may exceed the design allowable values for the nonsafety related masonary walls.At this time, we are evaluating these designs.The use of the C02 system in these nonsafety related areas will be under strict administrative controls under the direct control of the Station Shift Supervisor. In the interim, we plan to use backup hose streams and portable extinguishers for protection of these nonsafety related areas.Niagara Mohawk is continuing to pursue a resolution; however, we anticipate that the design solution could go beyond fuel load.Based upon this schedule, a Final Safety Analysis change to Sections 9.5.1 and 9A.3 is provided in Attachment 1 for Nuclear Regulatory Commission review and approval.The change removes the commitment to use C02 in the nonsafety related areas, which is still consistent with the Standard Review Plan.Further, this change does not affect the Technical Specifications. 8b07070388 860Ei261 PDR ADOCK 05000410 F PDR ~~r 4 ,~*I II I, tl 4~~~I~~4 4 4 4, I 4 4 I r C II C~'4 I Ms.Elinor G.Adensam Page 2 As soon as the design solution is implemented and testing complete, the Final Safety Analysis Report will be amended to reflect the installation of the C02 protection for nonsafety related areas.Very truly yours, C.V.Manga Senior Vice President NLR:ja 1737G Attachment xc: R.A.Gramm, NRC Resident Inspector Project File (2) m II k f'I (f C 1 L~~ UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of Niagara Mohawk Power Corporation )(Nine Mile Point Unit 2)Docket No.50-410 AFFIDAVIT C.V.Man an , being duly sworn, states that he is Senior Vice President of Niagara Mohawk Power Corporation; that he is authorized on the part of said Corporation to sign and file with the Nuclear Regulatory Commission the documents attached hereto;and that all such documents are true and correct to the best of his knowledge, information and belief.Subscribed and sworn'o before me, a Notary Pgblic in and for the State of New York and County of a., this g5'ay of C 1986.Qlz5is Notary Public in and for a County, New York y Co"'iIiSlNfkMIIip-'" Hohe Public in the State of Hew Yorfr alified in Onondaga Co.No.47876&g.y Commission Extnrea March 30, 1R!c VdTZN 3H)YEN'kg AaY e:H lo ei:Q oQ ni aiHrQ gdcH VNT8'CD ail.o3 agabnaa0 nl b~l>>lcvg Ml,06 dowU touqQ o."~u;m:no3 yM ATTACHMENT 1 9.5.1.2.9 Carbon dioxide systems are provided for Category I equipment rooms and will comply with NFPA Standard 12.The low pressure carbon dioxide system consists of two 13-ton storage tanks (300 psig O'), refrigeration unit, valves, and piping that conveys C02 to fixed nozzles at individual hazards.Total flooding carbon dioxide systems are automatically actuated by cross-zoned smoke detectors. Total flooding systems are provided for: 1.Standby switchgear rooms A and B and HPCS switchgear room in the control building.2.600V switchgear room in the reactor building.9A.3.6.5 C02 Suppression Systems (NFPA Standard 12)C02 systems are used in all safety related switchgear rooms.C02 systems comply with NFPA Standard 12 and the requirements of BTP CMEB 9.5-1, Section C.G.e.Disarming of C02 suppression systems will comply with the requirements of BTP CMEB 9.5-1, Section C.2.j. ~1~4 I~~~~~I 4~ ~~Nine Mile Point Unit 2 FSAR maximum allowable..In any case, cable tray water sprinkler'ystems are provided for these areas.In calculating fire loading for the diesel generator room, a fuel oil pipe rupture has been assumed with the entire contents of the fuel oil day tank spilled on the floor.It was also considered that all of the lube oil contained in the crankcase of the engine would leak out.These assumptions resulted in a fire loading of 2 hr 24 min, which is still less than the 3-hr walls that have been.provided.Automatic pre-action water sprinkler systems have been provided for the diesel generator building.The normal switchgear building also has a high fire loading, but it is J.ess than the 3-br fire walls that have been provide.d. Fire loading for all other areas is approximately 2 hr or less.In spite of the low fire loading, 3-hr fire walls have been provided wherever separation is required or desirable. 9A.3.1.2.5 Qetailed Fire Hazards Analysis by Building The following sections provide the detailed fire hazards analysis and a summar'y of the effects of fires in fire zones.This summary shows that the fire protection system will provide adequate ability to detect, prevent, and suppress postulated fire outbreaks in and around the plant.9A.3.1.2.5.1 Standby Gas Treatment Building Introduction The standby gas treatment (SGT)building is adjacent to the reactor building.It houses the SGTS units, reactor building ventilation supply unit, and railroad access bay, all of which are separated from each other by 3-hr fire walls and floors.Construction of the SGT building is detailed in Section 3.8.4.1.9. Safet-Related S stems The SGTS units are the only safety-related equipment in this building.Amendment 9A.3-8

Nine Mile Point Unit 2 FSAR During normal operation, the opening of one heat vent does not result in a release of radioactivity because the exhaust fan maintains the turbine building at a negative pressure.In the event of a fire with multiple operation of the heat vents, the design objectives of 10CFR100 would not be exceeded.Fire Detection and Su ression S stems Each area of the turbine building is protected by a zoned, early warning smoke detection system arranged to alarm locally and in the control room.Automatic wet-pipe sprinkler systems are provided for protection of general areas at el 250 ft 0 in and 277 ft 6 in.A system of six automatically operated foam water sprinkler systems (foam injection is manually controlled) covers the area under the turbine generator below el 306 ft 0 in.These systems would lay a blanket of foam on the floor under the turbine generator at el 277 ft 6 in to cover any accumulation of burning or unburned oil being discharged from a leak on the machine and to flow down the sides of the machine'nd lay a blanket of foam in the condenser pit, at el 239 ft 4 in.The foam water sprinkler systems utilize open foam water sprinkler heads spaced to achieve area coverage, and the water phase is actuated automatically by heat detectors. The water supply to the systems is controlled by automatic flow control valves.The foam concentrate pump is manually started.Two equal capacity foam pumps are provided for the foam water sprinkler systems.One is on automatic standby.Two foam concentrate tanks are provided for foam water sprinker systems and foam hose reels.To assist manual firefighting around the turbine ge'nerator, the water hose stations in the vicinity of the unit are provided with piped foam concentrate so that either water or foam'streams are available at these stations.CO<hose reels are also provided.Carbon dioxide total-flooding systems are,'provided for the alternator exciter enclosure, and the lube oil reservoir. Manual local application CO<systems are provided for turbine bearings and turbine lube oil piping.Manual water Amendment 9A.3-15

Nine Mile Point Unit 2 CESAR Manual water and CO~hose reels and portable extinguiehers are provided for backup protection. Drains are discuss'ed in Section 9A.3.5.1.12. 9A.3.1, 2.5.9 Auxiliary Boiler Building Yntroductian The auxiliary boiler building is a single-story structure with metal siding walls, I.t houses two electric boilers which are utilized during startup and shutdown, It has no interior walls and contains only 5mall amounts of combu s tib le s, The ventilation system consists of outside aix'ntake louvers and power roof exhaust fans.Safet-Related E i ment The auxiliary boiler building does not contain any safety-related equipment. Post Fire Anal sis There is no equipment in this building required for safe plant shutdown.Radioactive Release Anal sis A fire in the aukiliary boiler building will not result in excessive leakage of airborne radioactivity; t he desf gn objectives of 10CFR100 would not be exceeded.Pire Detection and Su ression The bui lding i s px ot ected by an early wax ning, smoke detection system axxanged to alarm and..annunciate in the control room.Since the fixe hazards analysis indicates a vexy low quantity of combustib'les and since the area is easily accessible for manual firefighting, fixed protection has not been provided.Mater hose xeels and portable extinguishers are provided for complete building coverage.O'A.3 22~Ofgty<igloo 0~~llf)1%'t I V+~~Sl~

'Nine Mile Point Unit 2 FSAR 9A.3.7.4 Plant Computer Room The plant computer is not safety related;it is not required to shut down the reactor or limit the~release of radioactivity to the environment. The computer room is located within the control room pressure boundary on the relay room elevation. The computer room walls have glass panels and are not fire rated.The relay room elevation of the control room pressure boundary is separated from all other areas by 3-hr barriers.A smoke detection system that alarms in the control room and an automatic total-flooding Halon suppression system have been provided in the computer room.Manual COz and water hose reels and portable extinguishers are available for backup.9A.3.7.5 Switchgear Rooms Rooms with safety re'lated switchgear are protected with automatic total-flooding-COz extinguishing systems.Manual COz and water hose reels and portable extinguishers are available for backup protection. Detection systems annunciate in the control room and alarm locally, Three-hour walls separate switchgear rooms from each other and from the remainder of the plant.Manually actuated smoke removal capability is provided for normal switchgear building and the control building switchgear rooms.For further details, refer to Section 9.4.Smoke removal.capability would be provided through the use of portable fans if required for other switchgear rooms.9A.3.7.6 Remote Safety-Related Panels Unit 2 has two remote shutdown rooms separated from each other and other plant areas by 3-hr barriers.An automatic fire detection system annunciates in the control room and alarms locally.;Manual COz and water hose reels and portable extinguishers have been provided outside this room.9A'.3.7.7 Safety-Related Battery Rooms Battery rooms are separated from each other and from the remainder of the plant by 3-hr fire walls, which are in excess of the fire load calculated =in the fire hazards analysis.All penetrations have a 3-hr rating.Separate ventilation systems have been provided for battery rooms to limit hydrogen buildup to 2 percent maximum.Fan failure is annunciated in the control room.Ross of flow initiates the redundant fan and prints out on the computer.Amendment 9A.3-56 0 4 Nine Nile Point Vnit 2 PSAR TABLE 9A.3-6 THNBINE BBILDING Figure Nom 9A.3-6 FA 84 Pire Area (FA)or Pire Sub Area (FSA)Number 740 XL Pire Zone El 277r-6<<Turbine building normal switchgear room west Area 1, 720 safety-Related Equipment in Area None Name Nisc eguip Cable trays Insul.Insul.706 25,346 Fire Hazard Combus-Quantitv tible Lb Gal Btu/Lb 12,000 12, 000 Total Btu (thousands'I 0, 472 304 152 L=-312, 624 Fire Loading Pire Barrier 8eq u ired 220, 370 2.3 hr Detection Svstem Smoke detection Crer S zoned Extinguishing System 9A.3-6 FA 83 726 XL El 277'-6>>Turbine building normal switchgear room east 2, 300 None Nisc equip Notor contcol centers Cable trays Insul.Fiber.Insul.979 402 48,010 12,000 10, 000 12,000 11,740 7,236 576 120 595, 104 258,740 3.2 hr Smoke detection ccoss-zoned 9A 3-6 FA 50 725 NZ El 288'-6>>Ventilation coom 5, 160 None Bise equip Motors l'able l ra y" Insu1.Insul.lnsul..156 36 10,457 12,000 10,000 12, 000 1, 072 360 125 rl04 L.127, 716 24,752 19 min Smoko detectiqn ,9A.3-6 FA 50 9A.3-6 FA 50 9A.3-6 FA 50 722 NZ 721 NZ 723HZ (A)724HZ (8)7 25NZ (C)El 277'-6>>Condensate demin-eralizer El 280'-6<<Off-gas room El 277 r-6>>Heater bay A room (similar for heater hays 8 and C)2,345 None 4,050 4,050 4050 Ncne 4,840 None Notors Cable trays Notors Bise equip Cable trays Notocs Cable trays Insul.Insul.Insul.Insul.Insul.Insul.Insul.72 6,372 3 208 5r062 1 4,152 10,000 12,000 10, 000 12, 000 12,000 10, 000 12,000 30 2,496 60 744 63, 270 10 49 824 49,034 720 76 464 L-77, 104 15, 947 12 min 26,900 20 min 12,3QQ 10 min Smoke detection smoke detoction smoke detection 1 of 5 Nine Nile Point Unit 2 PSAR TABLE 9A.3-9 (Cont)Figure No.Fire Area (Fh)or Fire Sub brea (FSAB)Pire Zone Area Name Safety-Belated Equipment in Area<<v Name Combus-tible Fire Hazard Ouantitv Lb Gal Btu/Lb Total Btus (thousands'I Fire Loading fB~tu ftvL Fire Barrier Bequired Detection System Ertinguj shing Svstem 9A.3-7 PA 59 951 NM El 309'-0" 6, 535 Truck loading 6 MSS storage None Motors Insul.10 10,000 100 15 Negli gi ble Smoke detection Automatic sprinkler system 9A.3-5 PA 70 905 NM El 261'u Decon area 6 dirty vorkshop 4,750 None Motors Insul.10,000 20 4 Negligible Smoke detect io n Automatic sprinkler system 9A.3-6 PA 70 395 XL El 279'-0" Radvaste svitch-gear room 2, 250 None Cables Insul.8436 12,000 101232 44992 34 min Smoke detection 9A.3-6 PA 70 390 XG 8 El 279~-Ou 907 NZ Badvaste control room and 2,500 None Cables Insul.10350 12,000 124200 49680 38 min Smoke Total floodlnn detection Union 9A.3-7 FA 70 903 NZ El 306'Ou Decon bldg HVAC equipment room 4,750 None Misc equip Insul.21 10, 000 210 Negligible Smoke detection 9 A.3-6 PA 58 904 NZ El 287'u LMS evaporators 650 None No combus-tibles Smoke detection)TI 5LPERmaZ ,CABD Amendment 3 of 3 Nine Nile Point Unit 2 FSAR TABLE 9A.3-10 NORNAL SMITCHGEAR BUILDING Figure No.9 A.3-4 FA 51 Pire Area (PA)or Pire Sub Area gFSA)Number Pire Zone Area Name 601 XL El 237',715 General area vest Safety-Belated Equipment in Area None Name N isc.equip.Cable trays Combus-tible Insul.Insul.Fire Hazard Ouantitv Lh Gal 797 24, 281 Btu/Lb 12,000 12, 000 Total Btu tthousandsl 9, 564 291 372 L 300,936 110,842 Fire Loading gBt~uft~z Pire Barrier Required fhrgmin 1.4 hp Detection System Smoke detection cross-zoned Extinguishing S stem I 9A 3-4 PA 52 9 A-3-4 FA 53 603 NZ El 237'-0<<1A battery room 830.None 602 XL El 2371 0<<4,590 None General area east Cable trays Nisc.equip.Notors Batteries Cable trays In sul.Insul.Insul.Styrene Insul.39,838 341 7 1,964 4,773 12,000 12, 000 12, 000 18,000 12,000 478,056 4,092 70 482,218 35,352 57 276 92,628 105,060 111,600 1.3 hr 1.4 hr Smoke detection cross-zoned Smoke detection 9A 3-4 FA 53 603 NZ El 237'-0<<18 battery room 830 None Batteries Cable trays Styren e Insul.1,964 5,867 18,000 12, 000 35,352 70 404-L 105,756 127,420 1.6 hr Smoke detection 9A.3-4 FA 53 603 NZ El 2371 0<<Room 4A 220 None Cable trays Insul.1,736 12,000 20,832 94,695 1.2 hr Smoke detectxon 9A.3-4 FA 53 9A 35 PA 78 9A.3-5 PA 79 603 NZ El 237'-0<<Room 4B 220 None 613 XL El 261'-0<<4, 590 None General area east 612 XL El 261'-0<<4,820 None General area vest Cable trays Bise.equip.Cable trays Notor control centers Bise.equip.Notcr control centers Cable trays Insul.Insul.Insul.Piher.Insul.Fiber.Insul.1,736 6,522 58,870 233 4,315 297 58,053 12,000 12, 000 782,264 706, 440 18,000 194 L 788,898 12, 000 51, 780 18,000 12, 000 5, 346 696 636 753, 762 12,000 20,832 94,695 1.2 hr 163,675 2.1 hr 164,220 2.1 hr Saoke detection Smoke detection cross-zoned Smoke detection cross-zoned Total flooding COz Total flooding~COx Amendment 1 of 2~gg-c33}}