GB 50745-2012 English PDF
Basic dataStandard ID: GB 50745-2012 (GB50745-2012)Description (Translated English): Code for design of fire protection for conventional island in nuclear power plants Sector / Industry: National Standard Classification of Chinese Standard: P64 Classification of International Standard: 27.120 Word Count Estimation: 117,125 Quoted Standard: GB 50016; GB 50074; GB 50084; GB 50116; GB 50140; GB 50151; GB 50177; GB 50193; GB 50219; GB 50222; GB 50370; GB 13495; GB 17945; GBJ 22; DL/T 5352 Regulation (derived from): Ministry of Housing and Urban Notice No. 1272 Issuing agency(ies): Ministry of Housing and Urban-Rural Development of the People's Republic of China; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China Summary: This Chinese standard applies to single turbogenerator generating capacity of one million kilowatts and below the conventional island of PWR nuclear power plants fire design. GB 50745-2012: Code for design of fire protection for conventional island in nuclear power plants---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order. 1 General 1.0.1 This specification is formulated to prevent fires in the conventional island of nuclear power plants, reduce fire hazards, and ensure the safety of people, property and nuclear power plants. 1.0.2 This code is applicable to the fire protection design of conventional islands of pressurized water reactor nuclear power plants with a single unit generating capacity of turbo-generator units of one million kilowatts and below. 1.0.3 The fire protection design of conventional islands should implement the relevant national policies, and achieve overall consideration, safety, reliability, advanced technology, and economical applicability. 1.0.4 The fire protection design of conventional islands of nuclear power plants shall not only comply with the provisions of this code, but also comply with the relevant current national standards. 2 terms 2.0.1 conventional island A collective term for steam turbine generator sets and their supporting facilities, buildings (structures). 2.0.2 turbine building A comprehensive building consisting of a turbine room, deaeration room, condensate polishing room, lubricating oil transfer room, etc. 2.0.3 main switchgear station main switchgear station High-voltage electrical devices and buildings (structures) that transmit electric energy to the grid and provide normal starting power to the unit. 2.0.4 auxiliary switchgear station auxiliary switchgear station High-voltage electrical installations and buildings (structures) that provide normal backup and maintenance power to the factory power system. 2.0.5 Network relay room switchgear control building The building that controls the main electrical equipment of the main switching station and auxiliary switching station. 2.0.6 Auxiliary boiler house It is a comprehensive building that provides auxiliary steam for the startup or shutdown of the turbo-generator set, mainly the auxiliary boiler room. 3 Fire hazard classification and fire resistance level of buildings (structures) 8 For several factory buildings with fire resistance rating not lower than Class II (unless otherwise specified in this code), the fire hazard shall be Class C, and the total floor area shall not exceed 8000m2 (single-storey) or 4000m2 (multi-storey), or D The buildings (structures) of Category E not exceeding 10000m2 (single and multi-storey) can be arranged in groups, and the distance between buildings (structures) in a group. when the height of the buildings (structures) does not exceed 7m, the spacing should not be less than 4m; when the building height exceeds 7m, the spacing should not be less than 6m. 9 The distance from the emergency oil storage pool to the production buildings (structures) with fire hazards of Category C, D and E (Class I and II fire resistance grades) shall not be less than 5m. 10 The spacing between buildings (structures) not mentioned in this table shall be implemented in accordance with the relevant provisions of the current national standard "Code for Fire Protection Design of Buildings" GB 50016. 4.0.6 The circular fire lanes should be set up around the steam turbine generator building (including nuclear island), switch station and oil tank area, and around other buildings (structures). The fire lane can use the traffic road in the plant. 4.0.7 In addition to meeting the requirements of the overall plan and the relevant provisions of the current national standard "Code for Design of Factory and Mine Roads" GB J 22, the design of fire protection roads in the plant area should also meet the following provisions. 1 The nuclear power plant site shall be provided with not less than two entrances in different directions, and their positions shall be convenient for fire-fighting vehicles to drive; 2 The turning radius of the road shall meet the needs of fire vehicles and shall not be less than 9m. 5 Fire compartments, safe evacuation and building structure of buildings (structures) 5.1 Fire compartments of buildings (structures) 5.1.1 Fire separation shall be carried out for the following places in the steam turbine generator building. 1 Cable shaft, cable interlayer; 2 Electronic equipment room, power distribution room, battery room; 3 ventilation equipment room; 4 lubricating oil room, lubricating oil transfer room; 5 Evacuation stairs5.1.2 The steam turbine generator building may not be divided into fire compartments, and the mechanical processing workshops with different fire hazards in the non-radioactive maintenance workshop should be divided into different fire compartments. 5.1.3 The length of each fire compartment in cable trenches, cable tunnels and integrated corridors containing oil pipelines or cables shall not exceed.200m, and fire separation measures shall be taken every 50m. 5.1.4 Category C warehouses should be arranged separately. When Category C warehouses are set up in Category D and E factories (warehouses), the following requirements shall be met. 1 The construction area of Category C warehouse shall be smaller than the permissible construction area of a fire compartment; 2 Class C warehouses are separated from other parts by firewalls and floors with a fire resistance rating of not less than 1.50h, and the doors on the firewalls are Class A fire doors; 3 An automatic fire extinguishing system shall be installed. 5.1.5 Class A and Class B warehouses should be arranged separately. When it needs to be combined with other warehouses, it should meet the following requirements. 1 The warehouse should be a single-storey building; 2.Explosion-proof measures and pressure relief facilities should be taken for the storage of Category A and B articles; 3 The parts storing Class A and B articles should be separated from other parts by anti-blast protective walls, and the load-bearing structures between them should be independent 5.2 Safe evacuation of factory building (warehouse) 5.2.1 The distance from the farthest working place on the ground in the factory building to the external exit or evacuation stairs should not be greater than 75m; the distance from the farthest working place on the underground part of the factory building to the evacuation stairs should not be greater than 45m. 5.2.2 The evacuation stairs of the steam turbine generator building shall adopt enclosed stairwells or outdoor stairs. 5.2.3 The Class A fire door on the firewall leading to the adjacent fire compartment can be used as the second safety exit for the factory (warehouse) room and cable tunnel. 5.2.4 There should be no less than two safety exits on each floor of the main and auxiliary switching stations, and the straight-line distance from the farthest indoor working place to the nearest safety exit should not be greater than 30m. 5.2.5 The straight-line distance from the farthest point in the power distribution room of the factory building to the evacuation exit should not be greater than 15m; when the length is greater than 7m, the number of evacuation exits should not be less than 2. 5.3 Building structure 5.3.1 The enclosed stairwells of D and E factories (warehouses) shall meet the following requirements. 1 The stairwell should have natural lighting and natural ventilation, and should be installed against the outer wall; when natural lighting and natural ventilation are not available, the front room may not be provided, but smoke prevention facilities shall be provided; 2 The storage room for combustible materials and the garbage channel shall not be set in the stairwell; 3.There should be no protrusions or other obstacles affecting evacuation in the stairwell; 4 The first floor of the stairwell may include aisles and halls to form an enlarged enclosed stairwell, but measures such as Class B fire doors shall be adopted to separate the stairwell from other passageways and rooms; 5 Except for the door of the stairwell, other door and window openings shall not be set on the inner wall of the stairwell. 5.3.2 The interior of the evacuation stairwell should not pass through combustible gas pipelines, steam pipelines, Class A, B, and C liquid pipelines 5.3.3 The fire resistance rating of the fire partition wall shall not be lower than 2.00h, and the fire resistance rating of the partition floor and beam shall not be lower than 1.00h. The doors and windows set on the fire partition wall shall be Class A fire doors and windows. 6.1.5 Anti-fuel oil should be used for the hydraulic adjustment system. 6.1.6 The oil tank of the steam-operated feed water pump should be arranged in the room, and a fire dike that can accommodate the maximum amount of oil leakage from the oil storage equipment should be installed. 6.1.7 The turbine oil system of the feed water pump shall be connected to the emergency oil pipeline of the steam turbine accident oil tank (pit). 6.2 Oil tank farm and oil pump room 6.2.1 The fire hazard classification of oil products in the oil tank area and oil pump room shall comply with the relevant provisions of the current national standard "Code for Design of Petroleum Storage" GB 50074. 6.2.2 When the oil unloading system of the tanker is connected from the lower part of the tanker, a closed piping system shall be adopted. 6.2.3 The fixed-roof oil tank shall be provided with a ventilation pipe. 6.2.4 The oil outlet pipeline of the oil tank shall be provided with an isolation valve near the outside of the fire dike. 6.2.5 The inlet pipe of the oil tank should be provided with an isolation valve close to the oil tank, and should enter from the lower part of the oil tank. When the process layout needs to be connected from the top of the oil tank, the oil inlet pipe should extend to the lower part of the oil tank. 6.2.6 The drainage pipes of the oil tank area shall be provided with isolation valves outside the fire embankment. 6.2.7 Pipelines should not pass through fire dikes. When it is necessary to pass through, the gap between the pipeline and the fire dike shall be tightly filled with fireproof sealing materials. When there are combustibles around the pipeline, fire protection measures shall be taken on the pipeline within 1m on both sides of the fire dike; when the diameter is larger than Or when the fuel pipeline equal to 32mm passes through the fire embankment, in addition to filling the fireproof sealing material, a fire-stop ring or fire-stop belt should also be set. 6.2.8 The discharge pipe of the positive displacement oil pump safety valve shall be connected to the oil return pipeline between the oil tank and the oil pump, and no valve shall be installed on the oil return pipeline. 6.2.9 The oil pipeline should be laid overhead. When the oil pipeline and the heating pipeline are laid in the same trench, the oil pipeline should be arranged under the heating pipeline, and heat insulation measures should be taken if necessary. 6.2.10 The oil pipeline shall be made of seamless steel pipe, the valve shall be made of steel valve, and the pressure grade shall be selected according to the higher pressure. Except that flanges must be used to connect equipment and other components, oil pipeline sections should be welded. 6.2.11 The connection between the burner oil gun interface and the fixed oil pipeline should be connected by a bellows with a metal braided mesh sleeve. 6.2.12 A quick automatic shut-off valve and a manual shut-off valve are to be installed on the main oil supply pipe of the auxiliary boiler. 6.2.13 Insulation materials for oil system equipment and pipelines shall be non-combustible materials. 6.2.14 The lightning protection and anti-static facilities for oil unloading, oil storage and oil delivery of the oil system shall comply with the relevant provisions of the current national standard "Code for Design of Petroleum Depots" GB 50074. 6.2.15 Measures to prevent overpressure should be taken on the fuel pipelines equipped with bellows compensators. 6.3 Transformers 6.3.1 The minimum distance between the outdoor oil-immersed transformer and each building (structure) shall meet the provisions of Article 4.0.5 of this code. 6.3.2 The minimum distance between outdoor oil-immersed transformers with an oil volume of 2500kg and above shall comply with the provisions in Table 6.3.2. 6.3.3 When the minimum distance between outdoor oil-immersed transformers with an oil volume of 2500kg and above does not meet the requirements in Table 6.3.2, a firewall shall be installed between the transformers, and the length of the firewall shall not be less than that of the two sides of the transformer oil storage tank. 1m, the height is not less than 0.5m of the height of the transformer oil conservator, and the fire resistance rating of the firewall should not be lower than 3.00h. 6.3.4 Oil-immersed transformers with a single outdoor oil volume greater than 1000kg should be equipped with oil storage or oil retaining facilities. The volume of the oil retaining facilities should be designed according to 20% of the oil volume of the transformer, and facilities for discharging accidental oil to a safe place should be provided. When the general emergency oil storage pool with oil-water separation measures is set, its capacity can be determined according to 60% of the capacity of the largest transformer oil tank. Oil storage or oil retaining facilities should be 1m larger than each side of the transformer outline. 6.3.5 The pebble layer with a thickness greater than or equal to 250mm should be laid in the oil storage facility, and the diameter of the pebble should be 50mm to 80mm. 6.3.6 The low-voltage plant transformer (isolation transformer), generator excitation transformer and control transformer shall adopt dry-type transformers. 6.4 Cables and cable laying 6.4.1 The exposed cables in the following places or circuits should be fire-resistant cables or take fire protection measures, and other cables can use flame-retardant cables. 1 Important circuits such as fire protection, alarm, emergency lighting and DC power supply; 2 One of the circuits when the computer monitoring, emergency power supply, uninterruptible power supply and other double circuits share the same cable channel and are not isolated from each other; 3 Inflammable and explosive places such as grease warehouses, dangerous goods warehouses, hydrogen supply stations, oil pump rooms, and gas storage areas; 4 The double-circuit power supply circuits of important power sources such as the circulating water pump room and the desalinated water production plant share one of the circuits that are not isolated from each other in the same cable channel. 6.4.2 In buildings (structures), the openings where cables lead to electrical panels, cabinets or control panels and tables, and the holes where cables run through partition walls and floor slabs shall be sealed with fireproof sealing materials. The fire resistance rating of the fire resistance should not be lower than the fire resistance of the penetrated object and should not be lower than 1.00h. The fireproof sealing material shall not contain halogen, and shall not corrode or damage the cables. 6.4.3 In the cable shaft, fireproofing shall be carried out at intervals of 6m; an entrance and exit of the cable shaft shall be provided at intervals of 12m, and the uppermost entrance and exit shall be within 6m from the top of the cable shaft. The outer surface of the cable shaft made of metal materials shall be coated with fireproof paint or fireproof paint, and its fire resistance rating shall not be lower than 2.00h. 6.4.4 Each cable tunnel or cable trench from the steam turbine generator building to the network relay room should contain no more than one unit cable, and the cables of different units arranged in the same room or cable channel should be spatially separated. 6.4.5 Firewalls shall be installed in the following parts of cable tunnels or trenches. 1 The branch of the common main tunnel or cable trench; 2 Long-distance cable tunnels or cable trenches at intervals of 50m; 3 the entrance to the building; 4 At the fence of the factory area. 6.4.6 Combustible gas, oil pipelines and other pipelines that may cause fire are strictly prohibited from passing through cable tunnels and cable trenches. 6.4.7 The aerial laying of cables shall comply with the following regulations. 1 The important cables for mutual backup of the normal operation system should be laid in different cable channels. When they are laid in the same cable channel, they should meet the requirements of Article 6.4.1 of this regulation; 2 Except for communication, lighting and signal cables, other cables shall not be laid in the evacuation passage. The cables laid in the evacuation passage should be laid through pipes, and the fire resistance rating of the cable penetrations passing through the evacuation passage should meet the relevant provisions of the current national standard "Code for Fire Protection Design of Buildings" GB 50016; 3 Measurement and control cables should be laid in closed metal trunking or through pipes; 4 Fire-stopping measures shall be provided at every 50m interval at the branch of the cable tray and the straight section. 6.4.8 For the cable section near the head of the steam turbine, the oil system of the steam turbine, etc., which are easily affected by external fires, fire-blocking measures or fire-resistant cables shall be adopted. 6.4.9 Cables laid overhead should keep a sufficient distance from the heating pipeline. When the control cables and power cables are parallel to the heating pipeline, the distance between them should not be less than 0.5m and 1.0m respectively; When pipelines cross, the distance between them should not be less than 0.25m and 0.5m respectively. When the requirements cannot be met, effective fire and heat insulation measures should be taken. 7 Fire water supply, fire extinguishing facilities and automatic fire alarm 7.1 General provisions 7.1.1 The fire-fighting water for conventional islands should be planned in a unified manner with the fire-fighting water for the whole plant of the nuclear power plant. 7.1.2 The fire water supply system shall meet the maximum primary fire extinguishing water consumption, flow and maximum pressure requirements of conventional islands. Note. 1 When calculating the water pressure, a water gun with a nozzle diameter of 19mm and a lined fire hose with a diameter of 65mm and a length of 25m should be used, and the calculated flow rate of each water gun should not be less than 5L/s. 2 The design flow velocity of the fire hydrant water supply pipeline should not be greater than 2.5m/s, and the flow velocity of the combined pipeline of the fire hydrant and the water spray fire extinguishing system or automatic sprinkler system should not exceed 5m/s 7.1.3 The maximum primary fire extinguishing water flow rate of the conventional island shall be the maximum value among the sum of the system flow rates of the outdoor fire hydrant, indoor fire hydrant, automatic sprinkler, water spray and foam fire extinguishing system that need to be opened at the same time for the building or equipment. The fire duration of the fire water supply system shall not be less than 2.00h. 7.1.4 Conventional islands should be set... ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB 50745-2012_English be delivered?Answer: Upon your order, we will start to translate GB 50745-2012_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB 50745-2012_English with my colleagues?Answer: Yes. The purchased PDF of GB 50745-2012_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.Question 3: Does the price include tax/VAT?Answer: Yes. 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