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

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 AFFILIATION 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 CQP IEB RECIP I ENT COP IES ID CODE/MANE LTTR ENCL ID CODE/NANE LTTR ENCL BWR ADTS BWR PD3 LA 1 0 0/JR PD3 PD 1 1 HAUQHEY> N 01 1 1 INTERNAL: ACRB 10 6 6 ADN/LFNB 1 0 ELD/HDB3 1 0 NRR STANQ> J 3 3 04 1 RQNi 1 EXTERNAL LPDR 03 1 'RC PDR 02 NSIC 05 1 1 TOTAL NUNBER OF COPIES REQUIRED: LTTR 20 ENCL 17

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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

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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)

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UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION In the Matter of Niagara Mohawk Power Corporation ) Docket No. 50-410 (Nine Mile Point Unit 2)

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, York and County of a., a Notary Pgblic in and this g5'ay of C for the State of New 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

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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.

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Nine Mile Point Unit 2 FSAR maximum allowable are provided

..In any case, cable for these areas.

tray water sprinkler 'ystems 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 provide.d.

is J.ess than the 3-br fire walls that have been 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.

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'Nine Mile Point Unit 2 FSAR 9A.3.7.4 Plant Computer Room The plant computer is not safety related; to shut down the reactor or limit the it is not required

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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

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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 Pire Area (FA) or safety- Pire Nom Pire Sub Area (FSA) Pire Zone Related Fire Hazard Fire Barrier Area Equipment Combus- Quantitv Total Btu Loading 8eq u ired Detection Extinguishing Number in Area Name tible Lb Gal Btu/Lb (thousands'I Svstem System 9A.3-6 FA 84 740 XL El 277r-6<< 1, 720 None Nisc eguip Insul. 706 12,000 0, 472 220, 370 2. 3 hr Smoke Turbine building Cable trays Insul. 25,346 12, 000 304 L= 152 detection normal switchgear 312, 624 Crer S room west zoned 9A.3-6 FA 83 726 XL El 277'-6>> 2, 300 None Nisc equip Insul. 979 12,000 11,740 258,740 3.2 hr Smoke Turbine building Notor contcol detection normal switchgear centers Fiber. 402 10, 000 7,236 ccoss-room east Cable trays Insul. 48,010 12,000 576 120 zoned 595, 104 9A 3-6 FA 50 725 NZ El 288'-6>> 5, 160 None Bise equip Insu1. 156 12,000 1, 072 24,752 19 min Smoko Ventilation coom Motors Insul. 36 10,000 360 detectiqn l'able l ra y" lnsul.. 10,457 12, 000 125 L. rl04 127, 716

,9A.3-6 FA 50 722 NZ El 277'-6>> 4,840 None Notors Insul. 72 10,000 720 15, 947 12 min Smoke Condensate demin- Cable trays Insul. 6,372 12,000 76 L 464 detection eralizer 77, 104 9A.3-6 FA 50 721 NZ El 280'-6<< 2,345 None Notors Insul. 3 10, 000 30 26,900 20 min smoke Off-gas room Bise equip Insul. 208 12, 000 2,496 detoction Cable trays Insul. 5r062 12,000 60 744 63, 270 9A.3-6 FA 50 723HZ (A) El 277 r 6>> 4,050 Ncne Notocs Insul. 1 10, 000 10 12,3QQ 10 min smoke 724HZ (8) Heater bay A room 4,050 Cable trays Insul. 4,152 12,000 49 824 detection 7 25NZ (C) (similar for 4050 49,034 heater hays 8 and C) 1 of 5

Nine Nile Point Unit 2 PSAR TABLE 9A.3-9 (Cont)

Figure Fire Area (Fh) or Safety-No. Fire Sub brea (FSAB) Pire Zone Belated Fire Area Equipment Fire Hazard Fire Barrier Name in Area<<v Combus- Ouantitv Btu/Lb Total Btus Loading Bequired Detection Ertinguj shing Name tible Lb Gal (thousands'I fB~tu ftvL System Svstem 9A.3-7 PA 59 951 NM El 309'-0" 6, 535 None Motors Insul. 10 10,000 100 15 Negli gi ble Smoke Automatic Truck loading 6 detection sprinkler system MSS storage 9A.3-5 PA 70 905 NM El 261'u 4,750 None Motors Insul. 10,000 20 4 Negligible Smoke Automatic Decon area 6 detect io n sprinkler system dirty vorkshop 9A.3-6 PA 70 395 XL El 279'-0" 2, 250 None Cables Insul. 8436 12,000 101232 44992 34 min Smoke Radvaste svitch- detection gear room 9A. 3-6 PA 70 390 XG 8 El 279 -Ou

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2,500 None Cables Insul. 10350 12,000 124200 49680 38 min Smoke Total floodlnn 907 NZ Badvaste control detection Union room and 9A. 3-7 FA 70 903 NZ El 306'Ou 4,750 None Misc equip Insul. 21 10, 000 210 Negligible Smoke Decon bldg detection HVAC equipment room 9 A. 3-6 PA 58 904 NZ El LMS 287 'u evaporators 650 None No combus-tibles Smoke detection

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,CABD Amendment 3 of 3

Nine Nile Point Unit 2 FSAR TABLE 9A. 3-10 NORNAL SMITCHGEAR BUILDING Pire Area (PA) or Safety- Pire Figure No. Pire Sub Area gFSA) Pire Zone Belated Fire Hazard Fire Barrier Area Equipment Combus- Ouantitv Btu/Lb Total Btu Loading Required Detection Extinguishing Number Name in Area Name tible Lh Gal tthousandsl gBt~uft~z fhrgmin System S Istem 9 A. 3-4 FA 51 601 XL El 237',715 General area vest None N isc. equip.

Cable trays Insul.

Insul.

797 24, 281 12,000 12, 000 9, 564 291 L 372 110,842 1.4 hp Smoke detection 300,936 cross-zoned 9A 3-4 PA 52 602 XL El 2371 0<< 4,590 None Cable trays In sul. 39,838 12,000 478,056 105,060 1.3 hr Smoke General area east Nisc. equip. Insul. 341 12, 000 4,092 detection Notors Insul. 7 12, 000 70 cross-482,218 zoned 9 A- 3-4 FA 53 603 NZ El 237'-0<< 830 . None Batteries Styrene 1,964 18,000 35,352 111,600 1.4 hr Smoke 1A battery room Cable trays Insul. 4,773 12,000 57 276 detection 92,628 9A 3-4 FA 53 603 NZ El 237'-0<< 830 None Batteries Styren e 1,964 18,000 35,352 127,420 1.6 hr Smoke 18 battery room Cable trays Insul. 5,867 12, 000 70-L 404 detection 105,756 9A. 3-4 FA 53 603 NZ El 2371 0<< 220 None Cable trays Insul. 1,736 12,000 20,832 94,695 1. 2 hr Smoke Room 4A detectxon 9A. 3-4 FA 53 603 NZ El 237'-0<< 220 None Cable trays Insul. 1,736 12,000 20,832 94,695 1. 2 hr Saoke Room 4B detection 9A 35 PA 78 612 XL El 261'-0<< 4,820 None Bise. equip. Insul. 6,522 12,000 782,264 163,675 2.1 hr Smoke Total flooding General area vest Cable trays Insul. 58,870 12, 000 706, 440 detection COz Notor control cross-centers Piher. 233 18,000 L 194 zoned 788,898 9A. 3-5 PA 79 613 XL El 261'-0<< 4, 590 None Bise. equip. Insul. 4,315 12, 000 51, 780 164,220 2.1 hr Smoke Total flooding General area east Notcr control detection ~

COx centers Fiber. 297 18,000 5, 346 cross-Cable trays Insul. 58,053 12, 000 696 636 zoned 753, 762 Amendment 1 of 2

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