Sodium cooled reactor three-loop system and arrangement planning method thereof

Abstract

The invention discloses a sodium-cooled reactor three-loop system and an arrangement planning method thereof, and the method comprises the steps: arranging a steam generator region at the outer side of a reactor hall, and arranging a steam generator in the sodium-cooled reactor three-loop system in the steam generator region, a sodium pipeline in a sodium cooled reactor secondary loop system penetrates out of a reactor hall to a steam generator area and is connected with a pipe nozzle on one side of a steam generator; a three-loop steam water supply area is arranged on the outer side of the steam generator area, and a three-loop water pipeline passes through the three-loop steam water supply area and penetrates out of the steam generator area to be connected with a pipe nozzle on the other side of the steam generator; a three-loop steam water supply pipe gallery area is arranged on the outer side of a reactor hall, and a three-loop water pipeline and a three-loop steam pipeline in a sodium cooled reactor three-loop system are connected to a steam turbine plant of a conventional island through different layers of the three-loop steam water supply pipe gallery area. The method is scientific and reasonable in layout, the arrangement space requirement can be lowered, the design risk is lowered, and safety and economical efficiency are improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear industry, and in particular relates to a sodium-cooled reactor three-circuit system and a layout planning method thereof. Background Art

[0002] The cooling medium in the reactor vessel of a sodium-cooled reactor is sodium. To prevent a rupture in the primary steam generator, which could cause water in the secondary system piping to enter the reactor core and potentially damage the core, a three-circuit system is configured. The secondary circuit uses sodium as the cooling medium, while the tertiary circuit uses water. The water in the tertiary circuit exchanges heat with the sodium in the secondary circuit through the secondary steam generator, transferring energy to the steam turbine for conversion into kinetic energy.

[0003] For pressurized water reactors (PWRs), the secondary circuit system runs through the nuclear island and the conventional island, similar to the tertiary circuit system of a sodium-cooled reactor. The working fluid is water, and the steam generator transfers heat to the PWR's secondary circuit system, which is then converted into electricity by the conventional island's steam turbine. In a conventional PWR, the steam generator is typically located within the reactor building. The secondary steam and feedwater piping is routed within the reactor annulus, then passes through the electrical building, where the atmospheric relief valve, safety valve, and isolation valve are located. Finally, it exits the nuclear island and reaches the turbine building.

[0004] The temperature of the water in the tertiary system of a sodium-cooled reactor (SCR) is significantly higher than that in the secondary system of a pressurized water reactor (PWR), reaching around 500°C. Furthermore, the pipes are larger and typically require insulation. This creates significant thermal stress, often requiring a piping layout with additional bends to absorb the thermal expansion. This results in a significant amount of piping space required, far exceeding the space required for the secondary system of a PWR. Furthermore, the tertiary system of a SCR should avoid arranging water piping adjacent to sodium piping to prevent the risk of spin-offs and sodium-water accidents leading to sodium fires.

[0005] Since the three-circuit system of the sodium-cooled reactor needs to meet the above requirements, its layout and design concept are very different from the main steam and main feed water system of the traditional pressurized water reactor. The conventional layout of the traditional pressurized water reactor is not suitable for the sodium-cooled reactor. If the secondary loop pipeline is arranged in the reactor corridor according to the layout of the pressurized water reactor, it will inevitably cause it to cross with the pipelines, cables, and air ducts entering and leaving the reactor building, affecting and interfering with each other, resulting in major safety hazards.

[0006] Therefore, it is urgent to develop a three-circuit system layout planning method for sodium-cooled reactors to guide the overall layout design of sodium-cooled reactors, improve safety, reduce investment costs, and ultimately realize the commercialization and mass production of sodium-cooled reactors. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art and provide a sodium-cooled reactor three-circuit system and a layout planning method thereof. The layout is scientific and reasonable, which can reduce the layout space requirement, reduce design risks, and improve safety and economy.

[0008] The technical solution of the present invention to solve the above technical problems is:

[0009] According to one aspect of the present invention, a layout planning method for a sodium-cooled reactor three-circuit system is provided, comprising:

[0010] Arrange a steam generator area in a first direction outside the reactor hall, arrange the steam generator in the sodium-cooled reactor tertiary circuit system in the steam generator area, and pass the sodium pipeline in the sodium-cooled reactor secondary circuit system from the reactor hall to the steam generator area and connect it to a nozzle on one side of the steam generator;

[0011] A three-circuit steam water supply area is arranged outside the steam generator area. The three-circuit water pipeline in the three-circuit system of the sodium-cooled reactor passes through the three-circuit steam water supply area and passes out to the steam generator area to be connected to the nozzle on the other side of the steam generator.

[0012] A three-circuit steam water supply corridor is arranged in the second direction outside the reactor hall, and the three-circuit steam water supply corridor is arranged in layers. The three-circuit water pipes and three-circuit steam pipes in the three-circuit system of the sodium-cooled reactor pass through the three-circuit steam water supply corridor and are connected to the turbine building of the conventional island through different layers of the three-circuit steam water supply corridor.

[0013] Optionally, the three-circuit steam water supply area is arranged in layers, a drainage isolation valve room is arranged in the lowest layer, and the three-circuit water pipeline passes through the drainage isolation valve room, and an emergency drainage isolation valve is arranged on the three-circuit water pipeline in the emergency drainage isolation room.

[0014] Optionally, a water supply isolation valve room is arranged on the upper floor of the emergency drainage isolation room, and the three-circuit water pipeline passes through the water supply isolation valve room, and a water supply isolation valve is arranged on the three-circuit water pipeline in the water supply isolation valve room.

[0015] Optionally, a steam isolation valve room is arranged on the upper layer of the water supply isolation valve room, and the three-circuit steam pipeline passes through the steam isolation valve room, and a steam isolation valve is arranged on the three-circuit steam pipeline in the steam isolation valve room.

[0016] Optionally, a steam safety valve room is arranged on the upper layer of the steam isolation valve room, and the three-circuit steam pipeline passes through the steam safety valve room, and a steam safety valve is arranged on the three-circuit steam pipeline in the steam safety valve room.

[0017] Optionally, an atmospheric relief valve room is arranged on the upper layer of the steam safety valve room, and the three-circuit steam pipeline passes through the atmospheric relief valve room, and an atmospheric relief valve is arranged on the three-circuit steam pipeline in the atmospheric relief valve room.

[0018] Optionally, a silencer platform is arranged on the upper layer between the atmospheric release valves, a silencer is arranged inside the silencer platform, and the silencer is connected to the outlet of the atmospheric release valve.

[0019] Optionally, the three-circuit steam water supply corridor area includes a three-circuit water supply corridor arranged on the lower layer and a three-circuit steam corridor arranged on the upper layer. The three-circuit water pipeline passes through the water supply isolation valve room in the three-circuit steam water supply area and is connected to the turbine building of the conventional island through the three-circuit water supply corridor, and a three-circuit water supply regulating valve group is arranged on the three-circuit water pipeline in the three-circuit water supply corridor; the three-circuit steam pipeline passes through the steam isolation valve room in the three-circuit steam water supply area and is connected to the turbine building of the conventional island through the three-circuit steam corridor.

[0020] Optionally, the sodium-cooled reactor three-loop system is arranged into two loops, and the steam generator areas are arranged on opposite sides outside the reactor hall. The three-loop water pipeline in each loop is set in the 180° direction of the sodium pipeline in the sodium-cooled reactor secondary loop system; the three-loop water pipeline gallery and the three-loop steam pipeline gallery are arranged in an L shape so that they surround the outside of the reactor building.

[0021] Optionally, the water supply isolation valve room and the steam isolation valve room are designed as nuclear-grade earthquake-resistant plants, and the three-circuit water supply pipeline gallery and the three-circuit steam pipeline gallery are designed as non-nuclear-grade earthquake-resistant plants.

[0022] According to another aspect of the present invention, a sodium-cooled reactor three-circuit system is provided, comprising a steam generator, a three-circuit water pipeline and a three-circuit steam pipeline, and further comprising a steam generator area, a three-circuit steam feed water area and a three-circuit steam feed water corridor area, wherein:

[0023] The steam generator area is located in the first direction outside the reactor hall. The steam generator in the sodium-cooled reactor three-circuit system is located in the steam generator area. One side nozzle of the steam generator is connected to the sodium pipeline of the sodium-cooled reactor secondary circuit system.

[0024] The three-circuit steam water supply area is located outside the steam generator area. The three-circuit water pipeline in the three-circuit system of the sodium-cooled reactor passes through the three-circuit steam water supply area and passes through the steam generator area to connect with the nozzle on the other side of the steam generator.

[0025] The three-circuit steam water supply corridor is located on the second direction outside the reactor hall. The three-circuit steam water supply corridor is arranged in layers. The three-circuit water pipes and three-circuit steam pipes pass through the three-circuit steam water supply corridor and are connected to the turbine building of the conventional island through different layers of the three-circuit steam water supply corridor.

[0026] Optionally, the three-circuit steam water supply area is arranged in layers, wherein the lowest layer is the drainage isolation valve room, the three-circuit water pipeline passes through the drainage isolation valve room, and an emergency drainage isolation valve is provided on the three-circuit water pipeline in the emergency drainage isolation room.

[0027] Optionally, the upper layer of the emergency drainage isolation room is a water supply isolation valve room, and the three-circuit water pipeline passes through the water supply isolation valve room. A water supply isolation valve is provided on the three-circuit water pipeline in the water supply isolation valve room.

[0028] Optionally, the upper layer of the water supply isolation valve room is a steam isolation valve room, the three-circuit steam pipeline passes through the steam isolation valve room, and a steam isolation valve is provided on the three-circuit steam pipeline in the steam isolation valve room.

[0029] Optionally, a steam safety valve room is arranged on the upper layer of the steam isolation valve room, the three-circuit steam pipeline passes through the steam safety valve room, and a steam safety valve is provided on the three-circuit steam pipeline in the steam safety valve room.

[0030] Optionally, an atmospheric relief valve room is arranged above the steam safety valve room, the three-circuit steam pipeline passes through the atmospheric relief valve room, and an atmospheric relief valve is provided on the three-circuit steam pipeline in the atmospheric relief valve room.

[0031] Optionally, a muffler platform is arranged on the upper layer between the atmospheric release valves, a muffler is provided in the muffler platform, and the muffler is connected to the outlet of the atmospheric release valve.

[0032] Optionally, the three-circuit steam water supply corridor area includes a three-circuit water supply corridor arranged on the lower layer and a three-circuit steam corridor arranged on the upper layer, wherein: the three-circuit water pipeline passes through the water supply isolation valve room in the three-circuit steam water supply area and is connected to the turbine building of the conventional island through the three-circuit water supply corridor, and a three-circuit water supply regulating valve group is provided on the three-circuit water pipeline in the three-circuit water supply corridor; the three-circuit steam pipeline passes through the steam isolation valve room in the three-circuit steam water supply area and is connected to the turbine building of the conventional island through the three-circuit steam corridor.

[0033] Optionally, the sodium-cooled reactor three-loop system includes two loops, and the number of steam generator areas is two. The two steam generator areas are respectively located on opposite sides outside the reactor building. The three-loop water pipes in each loop are located in the 180° direction of the sodium pipe in the sodium-cooled reactor secondary loop system. The three-loop water supply corridor and the three-loop steam corridor are both L-shaped and surrounded by the outside of the reactor building.

[0034] Optionally, the water supply isolation valve room and the steam isolation valve room are nuclear-grade earthquake-resistant buildings, and the three-circuit water supply pipeline gallery and the three-circuit steam pipeline gallery are non-nuclear-grade earthquake-resistant buildings.

[0035] Beneficial effects:

[0036] The sodium-cooled reactor three-circuit system and its layout planning method of the present invention achieve geographical isolation from the secondary sodium pipeline inside the steam generator by arranging the pipelines in the three-circuit system in the area outside the steam generator, and achieves physical isolation by arranging independent compartments such as steam isolation rooms and water isolation rooms, thereby achieving dual isolation of space and entity. This not only avoids the occurrence of cross-arrangement of the three-circuit water pipeline and the secondary sodium pipeline, but also reduces the risk of pipeline rupture and machine shedding on one side to the pipeline on the other side, effectively avoiding the occurrence of sodium fire risk, greatly improving safety, reducing the difficulty of later design and reducing subversive risks. By arranging an independent three-circuit steam water supply corridor area, the corridor is arranged outside the reactor and isolated from sodium-related items, avoiding the arrangement of the cable main tray therein, and further avoiding the impact of the risk of machine shedding on cables and other items. Compared with the pressurized water reactor secondary pipeline arranged in the ring corridor, which coincides with the personnel passage, this system isolates the personnel passage from the corridor, facilitates personnel inspections, and reduces the risk of harm to personnel.

[0037] At the same time, due to the long size of the steam generator, by arranging a layered three-circuit steam water supply area and a three-circuit steam water supply corridor area in the area outside the steam generator area, planning process rooms on each layer, and arranging corresponding pipeline valves in each process room, the relative positions of each area and process room of the sodium-cooled reactor three-circuit system in this system can be made more reasonable and consistent with the process flow, effectively reducing the length of the pipeline, avoiding mutual interlacing, saving the use of materials such as pipelines, brackets and buried plates, reducing the plane space and utilization height, reducing the layout space demand, and improving space utilization.

[0038] In addition, this system helps reduce civil engineering investment and improve the economic efficiency of the nuclear power plant by arranging non-safety-level pipeline items upstream of the water isolation valve and downstream of the steam isolation valve in non-seismic plant buildings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic plan view of a layout planning method for a sodium-cooled reactor three-circuit system according to an embodiment of the present invention;

[0040] Figure 2 It is a schematic elevation view of a layout planning method for a sodium-cooled reactor three-circuit system according to an embodiment of the present invention.

[0041] In the figure: 1-steam generator; 2-secondary circuit sodium pipeline; 3-tertiary circuit water pipeline. DETAILED DESCRIPTION

[0042] To help those skilled in the art better understand the technical solutions of the present invention, the following will provide a clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0043] In the description of the present invention, it should be noted that the term "upper" and the like to indicate an orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience and simplification of the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0044] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the specified features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0045] In view of the problems existing in the prior art of the design of the three-circuit system of a sodium-cooled reactor, such as large layout space requirements and fire resistance risks, the present invention discloses a layout planning method for the three-circuit system of a sodium-cooled reactor, comprising:

[0046] Arrange a steam generator area in a first direction outside the reactor hall, arrange the steam generator in the sodium-cooled reactor tertiary circuit system in the steam generator area, and pass the sodium pipeline in the sodium-cooled reactor secondary circuit system from the reactor hall to the steam generator area and connect it to a nozzle on one side of the steam generator;

[0047] A three-circuit steam water supply area is arranged outside the steam generator area. The three-circuit water pipeline in the three-circuit system of the sodium-cooled reactor passes through the three-circuit steam water supply area and passes out to the steam generator area to be connected to the nozzle on the other side of the steam generator.

[0048] A three-circuit steam water supply corridor is arranged in the second direction outside the reactor hall, and the three-circuit steam water supply corridor is arranged in layers. The three-circuit water pipes and three-circuit steam pipes in the three-circuit system of the sodium-cooled reactor pass through the three-circuit steam water supply corridor and are connected to the turbine building of the conventional island through different layers of the three-circuit steam water supply corridor.

[0049] Furthermore, the present invention also discloses a sodium-cooled reactor three-circuit system, comprising a steam generator, a three-circuit water pipeline and a three-circuit steam pipeline, and further comprising a steam generator area, a three-circuit steam water supply area and a three-circuit steam water supply corridor area, wherein:

[0050] The steam generator area is located in the first direction outside the reactor hall. The steam generator in the sodium-cooled reactor three-circuit system is located in the steam generator area. One side nozzle of the steam generator is connected to the sodium pipeline of the sodium-cooled reactor secondary circuit system.

[0051] The three-circuit steam water supply area is located outside the steam generator area. The three-circuit water pipeline in the three-circuit system of the sodium-cooled reactor passes through the three-circuit steam water supply area and passes through the steam generator area to connect with the nozzle on the other side of the steam generator.

[0052] The three-circuit steam water supply corridor is located on the second direction outside the reactor hall. The three-circuit steam water supply corridor is arranged in layers. The three-circuit water pipes and three-circuit steam pipes pass through the three-circuit steam water supply corridor and are connected to the turbine building of the conventional island through different layers of the three-circuit steam water supply corridor.

[0053] The sodium-cooled reactor three-loop system and the layout planning method thereof of the present invention have a scientific and reasonable layout on the basis of realizing system functions, can reduce layout space requirements, reduce design risks, and improve safety and economy.

[0054] Example 1

[0055] This embodiment discloses a layout planning method for a sodium-cooled reactor three-circuit system, including:

[0056] Arrange a steam generator area in a first direction outside the reactor hall, close to the reactor building, arrange the steam generators in the sodium-cooled reactor tertiary circuit system in the steam generator area, and pass the sodium pipeline in the sodium-cooled reactor secondary circuit system from the reactor hall to the steam generator area and connect it to one side nozzle of the steam generator;

[0057] A three-circuit steam water supply area is arranged outside the steam generator area. The three-circuit water pipeline in the three-circuit system of the sodium-cooled reactor passes through the three-circuit steam water supply area and passes through the steam generator area to connect with the nozzle on the other side of the steam generator. This realizes the 180-degree arrangement of the three-circuit water pipeline and the second-circuit sodium pipeline. This not only avoids the occurrence of the cross arrangement of the three-circuit water pipeline and the second-circuit sodium pipeline, but also reduces the risk of pipeline rupture on one side affecting the pipeline on the other side, realizes dual isolation of space and entity, effectively avoids the risk of sodium fire, and greatly improves safety.

[0058] A three-circuit steam water supply corridor is arranged in the second direction outside the reactor hall, and the three-circuit steam water supply corridor is arranged in layers. The three-circuit water pipes and three-circuit steam pipes in the three-circuit system of the sodium-cooled reactor pass through the three-circuit steam water supply corridor and are connected to the turbine building of the conventional island through different layers of the three-circuit steam water supply corridor. The water supply pipes and steam pipes are arranged in layers, which avoids the impact of steam pipe rupture on the water supply pipes and further improves safety.

[0059] In some embodiments, the three-circuit steam water supply area is arranged in layers, from bottom to top, including the drainage isolation valve room, the water supply isolation valve room, the steam isolation valve room, the steam safety valve room, the atmospheric release valve room and the muffler platform.

[0060] Specifically, a drain isolation valve room is located on the lowest level, and the three-circuit water pipeline is routed through the drain isolation valve room. An emergency drain isolation valve is then installed on the three-circuit water pipeline within the emergency drain isolation room. In the event of a sodium-water reaction, the emergency drain isolation valve opens after the steam generator outlet pressure drops to a certain level, draining water from the steam generator and pipelines. Placing it on the lowest level facilitates gravity drainage of the water within the pipeline.

[0061] A water supply isolation valve room is located above the emergency drainage isolation room. Three-circuit water piping is routed through the water supply isolation valve room, and water supply isolation valves are installed on the three-circuit water piping within the water supply isolation valve room. In the event of a steam generator heat transfer tube rupture, the water supply isolation valve on the faulty steam generator branch line is promptly closed to isolate the steam generator and mitigate the consequences of the sodium-water reaction. The pipeline upstream of the water supply isolation valve is non-safety-rated, while the pipeline downstream is safety-rated. The water supply isolation valve serves as the demarcation line between nuclear-grade and non-nuclear-grade seismic-resistant structures.

[0062] A steam isolation valve room is located above the feedwater isolation valve room. The three-circuit steam pipeline passes through the steam isolation valve room, and steam isolation valves are installed on the three-circuit steam pipeline within the steam isolation valve room. In the event of a steam generator leak or a rupture in the main steam pipeline, the steam isolation valve closes to prevent the accident from escalating. The pipeline downstream of the steam isolation valve is non-safety-rated, while the pipeline upstream is safety-rated. The steam isolation valve serves as the demarcation between nuclear-grade and non-nuclear-grade seismic-resistant structures.

[0063] A steam safety valve room is located above the steam isolation valve room, and the three-circuit steam pipeline is routed through the steam safety valve room. Steam safety valves are installed on the three-circuit steam pipeline within the steam safety valve room as overpressure protection devices for the steam generator and the three-circuit steam pipeline. If the atmospheric relief valve fails, steam can be discharged to the atmosphere through the steam safety valve, releasing the pressure in the steam pipeline and thus controlling the pressure in the steam generator so that it does not exceed the steam generator's design pressure.

[0064] An atmospheric relief valve room is located above the steam safety valve room, and the three-circuit steam pipeline is routed through the atmospheric relief valve room to reduce pipeline length. An atmospheric relief valve is installed on the three-circuit steam pipeline within the atmospheric relief valve room. In the event of a turbine bypass system failure or accidental closure of the rapid isolation valve, if the system pressure exceeds the set pressure of the atmospheric relief valve, the atmospheric relief valve opens and discharges the steam in the system to the atmosphere through the atmospheric relief valve to meet system functional requirements. This limits the pressure of the three-circuit steam pipeline to below the steam safety valve tripping pressure, preventing the steam safety valve from tripping.

[0065] A silencer platform is located above the atmospheric relief valves, with a silencer installed within the platform and connected to the outlet of the atmospheric relief valves. Steam exhausted from the atmospheric relief valves is released into the atmosphere through the silencer, reducing noise, meeting system functional requirements, and avoiding noise pollution. Furthermore, placing the silencer above the atmospheric relief valves aligns with the process flow, effectively reducing piping lengths and avoiding cross-cutting, thus reducing floor space and bulk material usage, lowering costs, and improving economic efficiency.

[0066] In some embodiments, the three-circuit steam water supply pipe gallery area includes a three-circuit water supply pipe gallery arranged on the lower layer and a three-circuit steam pipe gallery arranged on the upper layer.

[0067] Specifically, the three-circuit water pipeline is passed through the water supply isolation valve room in the three-circuit steam water supply area and then connected to the steam turbine powerhouse of the conventional island through the three-circuit water supply corridor. The three-circuit water supply regulating valve group is arranged on the three-circuit water pipeline in the three-circuit water supply corridor. The three-circuit water supply corridor and the water supply isolation valve room are on the same floor, which can reduce the length of the pipeline.

[0068] The three-circuit steam pipeline is passed through the steam isolation valve room in the three-circuit steam water supply area and then connected to the turbine building of the conventional island through the three-circuit steam pipe gallery. The three-circuit steam pipe gallery and the steam isolation valve room are on the same floor, which can reduce the length of the pipeline.

[0069] In some embodiments, the tertiary water supply corridor is arranged at an elevation of +10m to meet the traffic requirements between the nuclear island and the conventional island.

[0070] In some embodiments, the water isolation valve room and steam isolation valve room are designed as nuclear-grade earthquake-resistant powerhouses. The three-circuit water supply corridor and three-circuit steam corridor (i.e., the three-circuit steam water supply corridor area) are designed as non-nuclear-grade earthquake-resistant powerhouses, and the pipes and valves within the three-circuit steam water supply corridor area are designed as non-safety-grade and non-seismic. This helps reduce civil engineering investment costs and improve economic efficiency.

[0071] In some embodiments, the sodium-cooled reactor three-loop system is arranged into several loops, and several steam generator areas are arranged in the first direction outside the reactor hall, the steam generators in each loop are arranged in the corresponding steam generator area, and the sodium pipeline in the sodium-cooled reactor secondary loop system passes from the reactor hall to the steam generator area of ​​the corresponding loop and is connected to the nozzle on one side of the steam generator; three-loop steam water supply areas are arranged outside the steam generator area corresponding to each loop, the three-loop water pipeline in each loop passes through the corresponding three-loop steam water supply area and is connected to the nozzle on the other side of the steam generator; several three-loop steam water supply corridor areas are arranged in the second direction outside the reactor hall, and each three-loop steam water supply corridor area is arranged in layers, and the three-loop water pipeline and three-loop steam pipeline in each loop pass through the three-loop steam water supply area and then pass through different layers of the corresponding three-loop steam water supply corridor area to connect to the turbine building of the conventional island.

[0072] In this embodiment, Figure 1 、 Figure 2 As shown, the sodium-cooled reactor three-circuit system is arranged into two loops, and steam generator areas are arranged on opposite sides outside the reactor hall. The three-circuit water pipeline 3 in each loop is arranged in the 180° direction of the sodium pipeline (i.e., the secondary sodium pipeline 2) in the sodium-cooled reactor secondary loop system; the three-circuit water pipeline gallery and the three-circuit steam pipeline gallery of each loop are arranged in an L shape so as to surround the outside of the reactor building.

[0073] Specifically, a first-loop steam generator area A and a second-loop steam generator area B are arranged on opposite sides outside the reactor hall, and the sodium pipeline in the secondary loop system of the sodium-cooled reactor is passed from the reactor hall G to the first-loop steam generator area A and the second-loop steam generator area B, and is connected to the nozzles on one side of the steam generator 1 in the first-loop steam generator area A and the second-loop steam generator area B, respectively, to transport the sodium medium in the secondary loop system to the evaporator to provide a heat source.

[0074] A single-loop three-loop steam water supply area C is arranged outside the single-loop steam generator area A, and a second-loop three-loop steam water supply area D is arranged outside the second-loop steam generator area B. The three-loop water pipe 3 in the sodium-cooled reactor three-loop system is connected to the nozzle on the other side of the steam generator 1 in the single-loop steam generator area A and the second-loop steam generator area B, respectively. That is, the three-loop water pipe 3 of each loop is arranged in the 180° direction of the sodium pipe, so that the sodium pipe in the second-loop system and the three-loop water pipe 3 in each loop are arranged at 180°.

[0075] A drainage isolation valve room C / D-1 is arranged at the bottom layer of the three-circuit steam water supply area of ​​the first loop / second loop, and the three-circuit water pipeline 3 in each loop passes through the corresponding drainage isolation valve room C / D-1, and an emergency drainage isolation valve is arranged on the three-circuit water pipeline 3 in each emergency drainage isolation room C / D-1.

[0076] A water supply isolation valve room C / D-2 is arranged on the upper layer of each emergency drainage isolation room C / D-1, and the three-circuit water pipe 3 in each loop passes through the corresponding water supply isolation valve room C / D-2, and a water supply isolation valve is arranged on the three-circuit water pipe 3 in each water supply isolation valve room C / D-2.

[0077] A steam isolation valve room C / D-3 is arranged on the upper layer of each water supply isolation valve room C / D-2, close to the steam pipe interface nozzle at the upper part of the steam generator, and the three-circuit steam pipes in each loop pass through the corresponding steam isolation valve room C / D-3, and steam isolation valves are arranged on the three-circuit steam pipes in each steam isolation valve room C / D-3.

[0078] A steam safety valve room C / D-4 is arranged on the upper layer of each steam isolation valve room C / D-3, and the three-circuit steam pipeline in each loop passes through the corresponding steam safety valve room C / D-4, and steam safety valves are arranged on the three-circuit steam pipeline in each steam safety valve room C / D-4.

[0079] An atmospheric relief valve room C / D-5 is arranged on the upper layer of each steam safety valve room C / D-4, and the three-circuit steam pipeline in each loop passes through the corresponding atmospheric relief valve room C / D-5, and an atmospheric relief valve is arranged on the three-circuit steam pipeline in each atmospheric relief valve room CD-5.

[0080] A silencer platform C / D-6 is arranged on the upper layer between each atmospheric relief valve (such as outside the roof above C / D-5), and a silencer is arranged in each silencer platform C / D-6, and each silencer is connected to the outlet of the corresponding atmospheric relief valve.

[0081] Correspondingly, in the three-circuit steam water supply corridor area of ​​the first loop / second loop, the three-circuit water supply corridor E / F-1 is arranged on the lower layer and the three-circuit steam corridor E / F-2 is arranged on the upper layer, wherein: the three-circuit water pipe 3 of each loop passes through the water supply isolation valve room C / D-2 in the three-circuit steam water supply area and is connected to the turbine plant of the conventional island through the corresponding three-circuit water supply corridor E / F-1, and the three-circuit water supply regulating valve group is arranged respectively on the three-circuit water pipe 3 in the three-circuit water supply corridor E / F-1 in each loop; the three-circuit steam pipe of each loop passes through the steam isolation valve room C / D-3 in the three-circuit steam water supply area and is connected to the turbine plant of the conventional island through the corresponding three-circuit steam corridor E / F-2.

[0082] In some embodiments, the three-loop steam water supply corridor areas in the first loop and the second loop are symmetrically arranged at the outermost sides and have the same length, forming a "double L-shaped" design. This not only enables uniform transfer of heat energy in the three-loop system, but also avoids the drawbacks of cross-interference of pipelines in pressurized water reactors, allowing the three-loop pipelines to complement and interfere with other pipelines, which is conducive to the comprehensive planning and layout of pipelines.

[0083] The layout planning method of the sodium-cooled reactor three-circuit system of this embodiment achieves geographical isolation from the secondary sodium pipeline inside the steam generator by arranging the pipelines in the three-circuit system in the area outside the steam generator, and achieves physical isolation by arranging independent compartments such as steam isolation rooms and water isolation rooms, thereby achieving dual isolation of space and entity. This not only avoids the occurrence of cross-arrangement of the three-circuit water pipeline and the secondary sodium pipeline, but also reduces the risk of pipeline rupture and machine shedding on one side to the pipeline on the other side, effectively avoiding the occurrence of sodium fire risk, greatly improving safety, reducing the difficulty of later design and reducing the risk of subversion. By arranging an independent three-circuit steam water supply corridor area, the corridor is arranged outside the reactor and isolated from sodium-related items, avoiding the arrangement of the cable main tray therein, and further avoiding the impact of the risk of machine shedding on cables and other items. Compared with the pressurized water reactor secondary pipeline arranged in the ring corridor, which coincides with the personnel passage, this method isolates the personnel passage from the corridor, facilitates personnel inspections, and reduces the risk of harm to personnel.

[0084] At the same time, due to the long size of the steam generator, by arranging a layered three-circuit steam water supply area and a three-circuit steam water supply corridor area in the area outside the steam generator area, planning process rooms on each layer, and arranging corresponding pipeline valves in each process room, the relative positions of each area and process room of the sodium-cooled reactor three-circuit system in this method can be made more reasonable and consistent with the process flow, effectively reducing the length of the pipeline, avoiding mutual interlacing, saving the use of materials such as pipelines, brackets and buried plates, reducing the plane space and utilization height, reducing the layout space demand, and improving space utilization.

[0085] In addition, this method helps reduce civil engineering investment and improve the economic efficiency of the nuclear power plant by arranging non-safety-level pipeline items upstream of the water isolation valve and downstream of the steam isolation valve in a non-seismic plant building.

[0086] Example 2

[0087] This embodiment discloses a sodium-cooled reactor three-circuit system arranged using the above-mentioned sodium-cooled reactor three-circuit system arrangement planning method, which includes a steam generator, a three-circuit water pipeline, and a three-circuit steam pipeline, and also includes a steam generator area, a three-circuit steam water supply area, and a three-circuit steam water supply corridor area, wherein:

[0088] The steam generator area is located in the first direction outside the reactor hall. The steam generator in the sodium-cooled reactor three-circuit system is located in the steam generator area. One side nozzle of the steam generator is connected to the sodium pipeline of the sodium-cooled reactor secondary circuit system.

[0089] The three-circuit steam water supply area is located outside the steam generator area. The three-circuit water pipeline in the three-circuit system of the sodium-cooled reactor passes through the three-circuit steam water supply area and passes through the steam generator area to connect with the nozzle on the other side of the steam generator.

[0090] The three-circuit steam water supply corridor is located on the second direction outside the reactor hall. The three-circuit steam water supply corridor is arranged in layers. The three-circuit water pipes and three-circuit steam pipes pass through the three-circuit steam water supply corridor and are connected to the turbine building of the conventional island through different layers of the three-circuit steam water supply corridor.

[0091] In some embodiments, the three-circuit steam water supply area is arranged in layers, including, from bottom to top, the drainage isolation valve room, the water supply isolation valve room, the steam isolation valve room, the steam safety valve room, the atmospheric release valve room, and the muffler platform.

[0092] Specifically, the lowest layer of the three-circuit steam water supply area is the drainage isolation valve room. The three-circuit water pipeline passes through the drainage isolation valve room. An emergency drainage isolation valve is installed on the three-circuit water pipeline in the drainage isolation room.

[0093] The upper layer of the emergency drainage isolation room is the water supply isolation valve room. The three-circuit water pipeline passes through the water supply isolation valve room. A water supply isolation valve is installed on the three-circuit water pipeline in the water supply isolation valve room.

[0094] The layer above the water supply isolation valve room is the steam isolation valve room. The three-circuit steam pipeline passes through the steam isolation valve room. Steam isolation valves are installed on the three-circuit steam pipelines in the steam isolation valve room.

[0095] A steam safety valve room is arranged on the upper layer of the steam isolation valve room. The three-circuit steam pipeline passes through the steam safety valve room. Steam safety valves are installed on the three-circuit steam pipeline in the steam safety valve room.

[0096] An atmospheric relief valve room is arranged on the upper layer of the steam safety valve room. The three-circuit steam pipeline passes through the atmospheric relief valve room. An atmospheric relief valve is provided on the three-circuit steam pipeline in the atmospheric relief valve room.

[0097] A silencer platform is arranged on the upper layer of the atmospheric release valve room. A silencer is arranged in the silencer platform and the silencer is connected to the outlet of the atmospheric release valve.

[0098] In some embodiments, the three-circuit steam water supply pipe gallery area includes a three-circuit water supply pipe gallery arranged on the lower layer and a three-circuit steam pipe gallery arranged on the upper layer.

[0099] Specifically, the three-circuit water pipeline passes through the water supply isolation valve room in the three-circuit steam water supply area and is connected to the turbine building of the conventional island through the three-circuit water supply corridor. A three-circuit water supply regulating valve group is installed on the three-circuit water pipeline in the three-circuit water supply corridor; the three-circuit steam pipeline passes through the steam isolation valve room in the three-circuit steam water supply area and is connected to the turbine building of the conventional island through the three-circuit steam corridor E / F-2.

[0100] In some embodiments, the three-circuit water supply corridor is located at an elevation of +10m to meet the traffic needs between the nuclear island and the conventional island.

[0101] In some implementations, the water isolation valve room and steam isolation valve room are designed as nuclear-grade earthquake-resistant buildings. The three-circuit water supply corridor and three-circuit steam corridor (i.e., the three-circuit steam water supply corridor area) are designed as non-nuclear-grade earthquake-resistant buildings. The pipes and valves within the three-circuit steam water supply corridor area are designed as non-safety-grade and non-seismic. This helps reduce civil engineering investment costs and improve economic efficiency.

[0102] In some embodiments, the sodium-cooled reactor's three-circuit system includes several loops, each loop being equipped with a corresponding steam generator area, a three-circuit steam feedwater area, and a three-circuit steam feedwater corridor. Each steam generator area is located on a first direction outside the reactor hall. The steam generators in each loop are located within the corresponding steam generator area, with one side nozzle of each steam generator connected to the sodium pipeline of the sodium-cooled reactor's secondary loop system. Each three-circuit steam feedwater area is located outside the steam generator area of ​​the corresponding loop. The three-circuit water pipelines in each loop pass through the corresponding three-circuit steam feedwater area and connect to the other side nozzles of the steam generators in the corresponding steam generator area. Each three-circuit steam feedwater corridor is located on a second direction outside the reactor hall. The three-circuit steam feedwater corridors are arranged in layers. The three-circuit water pipelines and three-circuit steam pipelines of each loop pass through the three-circuit steam feedwater area and are connected to the turbine building of the conventional island through different layers of the three-circuit steam feedwater corridor.

[0103] In this embodiment, Figure 1 、 Figure 2 As shown, the sodium-cooled reactor three-circuit system includes two loops, the steam generator areas in the two loops are respectively arranged on opposite sides outside the reactor hall, and the three-circuit water pipeline 3 in each loop is arranged in the 180° direction of the sodium pipeline in the sodium-cooled reactor secondary loop system; the three-circuit water pipeline gallery and the three-circuit steam pipeline gallery are arranged in an L shape, so that they surround the outside of the reactor building.

[0104] Specifically, the two steam generator areas on opposite sides outside the reactor hall are the first-loop steam generator area A and the second-loop steam generator area B, corresponding to the first loop and the second loop respectively. The sodium pipeline in the secondary loop system of the sodium-cooled reactor passes through the reactor hall G to the first-loop steam generator area A and the second-loop steam generator area B respectively, and is connected to the nozzles on one side of the steam generator 1 in the first-loop steam generator area A and the second-loop steam generator area B respectively, so as to transport the sodium medium in the secondary loop system to the evaporator to provide a heat source.

[0105] Arranged outside the single-loop steam generator area A is a single-loop three-loop steam water supply area C, and arranged outside the second-loop steam generator area B is a second-loop three-loop steam water supply area D. The three-loop water pipes 3 in the two loops are respectively connected to the nozzles on the other side of the steam generator 1 in the corresponding single-loop steam generator area A and the second-loop steam generator area B, that is, the three-loop water pipe 3 of each loop is arranged in the 180° direction of the sodium pipe, so that the sodium pipe in the second-loop system is arranged at 180° with the three-loop water pipe 3 in each loop.

[0106] The lowest layer of the three-circuit steam water supply area of ​​the first loop / second loop is the drainage isolation valve room C / D-1. The three-circuit water pipeline 3 in each loop passes through the corresponding drainage isolation valve room C / D-1. An emergency drainage isolation valve is installed on the three-circuit water pipeline 3 in each emergency drainage isolation room C / D-1.

[0107] A water supply isolation valve room C / D-2 is provided on the upper floor of each emergency drainage isolation room C / D-1. The three-circuit water pipe 3 in each loop passes through the corresponding water supply isolation valve room C / D-2. A water supply isolation valve is provided on the three-circuit water pipe 3 in each water supply isolation valve room C / D-2.

[0108] A steam isolation valve room C / D-3 is provided on the upper layer of each water supply isolation valve room C / D-2. The steam isolation valve room C / D-3 is close to the steam pipe interface nozzle at the upper part of the steam generator. The three-circuit steam pipes in each loop pass through the corresponding steam isolation valve room C / D-3. A steam isolation valve is provided on the three-circuit steam pipes in each steam isolation valve room C / D-3.

[0109] A steam safety valve room C / D-4 is provided on the upper level of each steam isolation valve room C / D-3. The three-circuit steam pipeline in each loop passes through the corresponding steam safety valve room C / D-4. A steam safety valve is provided on the three-circuit steam pipeline in each steam safety valve room C / D-4.

[0110] An atmospheric relief valve room C / D-5 is provided on the upper level of each steam safety valve room C / D-4. The three-circuit steam pipeline in each loop passes through the corresponding atmospheric relief valve room C / D-5. An atmospheric relief valve is provided on the three-circuit steam pipeline in each atmospheric relief valve room CD-5.

[0111] A silencer platform C / D-6 is provided on the upper layer between each atmospheric relief valve (such as outside the roof above C / D-5), and each silencer platform C / D-6 is provided with a silencer, and each silencer is connected to the outlet of the corresponding atmospheric relief valve.

[0112] Correspondingly, the three-circuit steam water supply corridor area of ​​the first loop / second loop is provided with a three-circuit water supply corridor E / F-1 on the lower layer and a three-circuit steam pipe corridor E / F-2 arranged on the upper layer, wherein: the three-circuit water pipe 3 of each loop passes through the water supply isolation valve room C / D-2 in the three-circuit steam water supply area and is connected to the turbine building of the conventional island through the corresponding three-circuit water supply corridor E / F-1, and a three-circuit water supply regulating valve group is respectively provided on the three-circuit water pipe 3 in each three-circuit water supply corridor; the three-circuit steam pipe of each loop passes through the steam isolation valve room C / D-3 in the three-circuit steam water supply area and is connected to the turbine building of the conventional island through the corresponding three-circuit steam pipe corridor E / F-2.

[0113] In some embodiments, the three-loop steam water supply corridor areas in the first loop and the second loop are symmetrically arranged at the outermost sides and have the same length, forming a "double L-shaped" design. This not only enables uniform transfer of heat energy in the three-loop system, but also avoids the drawbacks of cross-interference of pipelines in pressurized water reactors, allowing the three-loop pipelines to complement and interfere with other pipelines, which is conducive to the comprehensive planning and layout of pipelines.

[0114] The sodium-cooled reactor three-circuit system of this embodiment achieves geographical isolation from the secondary sodium pipeline inside the steam generator by arranging the pipelines in the three-circuit system in the area outside the steam generator. In addition, by setting up independent compartments such as steam isolation rooms and water supply isolation rooms for physical isolation, it achieves dual isolation of space and entity. This not only avoids the occurrence of cross-arrangement of the three-circuit water pipeline and the secondary sodium pipeline, but also reduces the risk of pipeline rupture and machine shedding on one side to the pipeline on the other side, effectively avoiding the occurrence of sodium fire risk, greatly improving safety, reducing the difficulty of later design and reducing the risk of subversion. By setting up an independent three-circuit steam water supply corridor area, the corridor is arranged outside the reactor and isolated from sodium-related items, avoiding the arrangement of cable main trays in it, and further avoiding the impact of the risk of machine shedding on cables and other items. Compared with the pressurized water reactor secondary pipeline arranged in the ring corridor, which coincides with the personnel passage, this system isolates the personnel passage from the corridor, facilitating personnel inspections and reducing the risk of harm to personnel.

[0115] At the same time, due to the long size of the steam generator, by arranging a layered three-circuit steam water supply area and a three-circuit steam water supply corridor area in the area outside the steam generator area, planning process rooms on each layer, and arranging corresponding pipeline valves in each process room, the relative positions of each area and process room of the sodium-cooled reactor three-circuit system in this system can be made more reasonable and consistent with the process flow, effectively reducing the length of the pipeline, avoiding mutual interlacing, saving the use of materials such as pipelines, brackets and buried plates, reducing the plane space and utilization height, reducing the layout space demand, and improving space utilization.

[0116] In addition, this system helps reduce civil engineering investment and improve the economic efficiency of the nuclear power plant by arranging non-safety-level pipeline items upstream of the water isolation valve and downstream of the steam isolation valve in non-seismic plant buildings.

[0117] It will be understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art will appreciate that various modifications and improvements can be made without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A layout planning method for a sodium-cooled reactor three-circuit system, characterized in that: include: Arrange a steam generator area in a first direction outside the reactor hall, arrange the steam generator in the sodium-cooled reactor tertiary circuit system in the steam generator area, and pass the sodium pipeline in the sodium-cooled reactor secondary circuit system from the reactor hall to the steam generator area and connect it to a nozzle on one side of the steam generator; A three-circuit steam water supply area is arranged outside the steam generator area. The three-circuit water pipeline in the three-circuit system of the sodium-cooled reactor passes through the three-circuit steam water supply area and passes out to the steam generator area to be connected to the nozzle on the other side of the steam generator. A three-circuit steam water supply corridor is arranged in the second direction outside the reactor hall, and the three-circuit steam water supply corridor is arranged in layers. The three-circuit water pipes and three-circuit steam pipes in the three-circuit system of the sodium-cooled reactor pass through the three-circuit steam water supply corridor and are connected to the turbine building of the conventional island through different layers of the three-circuit steam water supply corridor.

2. The layout planning method of the sodium-cooled reactor three-circuit system according to claim 1, characterized in that: The three-circuit steam water supply area is arranged in layers, and the drainage isolation valve room is arranged in the lowest layer. The three-circuit water pipeline passes through the drainage isolation valve room, and an emergency drainage isolation valve is arranged on the three-circuit water pipeline in the emergency drainage isolation room.

3. The layout planning method of the sodium-cooled reactor three-circuit system according to claim 2, characterized in that: A water supply isolation valve room is arranged on the upper floor of the emergency drainage isolation room, and the three-circuit water pipeline passes through the water supply isolation valve room, and a water supply isolation valve is arranged on the three-circuit water pipeline in the water supply isolation valve room.

4. The layout planning method of the sodium-cooled reactor three-circuit system according to claim 3, characterized in that: A steam isolation valve room is arranged on the upper layer of the water supply isolation valve room, and the three-circuit steam pipeline passes through the steam isolation valve room, and a steam isolation valve is arranged on the three-circuit steam pipeline in the steam isolation valve room.

5. The layout planning method of the sodium-cooled reactor three-circuit system according to claim 4, characterized in that: A steam safety valve room is arranged on the upper layer of the steam isolation valve room, and the three-circuit steam pipeline passes through the steam safety valve room, and steam safety valves are arranged on the three-circuit steam pipeline in the steam safety valve room.

6. The layout planning method of the sodium-cooled reactor three-circuit system according to claim 5, characterized in that: An atmospheric relief valve room is arranged on the upper layer of the steam safety valve room, and the three-circuit steam pipeline passes through the atmospheric relief valve room, and an atmospheric relief valve is arranged on the three-circuit steam pipeline in the atmospheric relief valve room.

7. The layout planning method of the sodium-cooled reactor three-circuit system according to claim 6, characterized in that: A muffler platform is arranged on the upper layer between the atmospheric release valves, a muffler is arranged inside the muffler platform, and the muffler is connected to the outlet of the atmospheric release valve.

8. The layout planning method of the sodium-cooled reactor three-circuit system according to claim 7, characterized in that: The three-circuit steam water supply pipe gallery area includes the three-circuit water supply pipe gallery arranged on the lower layer and the three-circuit steam pipe gallery arranged on the upper layer. The tertiary water pipeline is passed through the feedwater isolation valve room in the tertiary steam water supply area and connected to the steam turbine building of the conventional island through the tertiary water supply corridor. A tertiary water supply regulating valve group is arranged on the tertiary water pipeline in the tertiary water supply corridor. The three-circuit steam pipeline is passed through the steam isolation valve room in the three-circuit steam water supply area and then connected to the turbine building of the conventional island through the three-circuit steam pipeline gallery.

9. The layout planning method of the sodium-cooled reactor three-circuit system according to claim 8, characterized in that: Arrange the sodium-cooled reactor tertiary system into two loops, with steam generator blocks located on opposite sides of the reactor hall. Place the tertiary water pipe in each loop at 180° to the sodium pipe in the sodium-cooled reactor secondary system. The three-circuit water supply corridor and the three-circuit steam corridor are arranged in an L shape so as to surround the outside of the reactor building.

10. The layout planning method of a sodium-cooled reactor three-circuit system according to claim 8, characterized in that: The water supply isolation valve room and steam isolation valve room are designed as nuclear-grade earthquake-resistant plants, and the three-circuit water supply pipeline gallery and three-circuit steam pipeline gallery are designed as non-nuclear-grade earthquake-resistant plants.

11. A sodium-cooled reactor three-circuit system, comprising a steam generator, a three-circuit water pipeline and a three-circuit steam pipeline, characterized in that: It also includes the steam generator area, the three-circuit steam water supply area and the three-circuit steam water supply pipe gallery area, including: The steam generator area is located in the first direction outside the reactor hall. The steam generator in the sodium-cooled reactor three-circuit system is located in the steam generator area. One side nozzle of the steam generator is connected to the sodium pipeline of the sodium-cooled reactor secondary circuit system. The three-circuit steam water supply area is located outside the steam generator area. The three-circuit water pipeline in the three-circuit system of the sodium-cooled reactor passes through the three-circuit steam water supply area and passes through the steam generator area to connect with the nozzle on the other side of the steam generator. The three-circuit steam water supply corridor is located on the second direction outside the reactor hall. The three-circuit steam water supply corridor is arranged in layers. The three-circuit water pipes and three-circuit steam pipes pass through the three-circuit steam water supply corridor and are connected to the turbine building of the conventional island through different layers of the three-circuit steam water supply corridor.

12. The sodium-cooled reactor three-circuit system according to claim 11, characterized in that: The three-circuit steam water supply area is arranged in layers, among which the lowest layer is the drainage isolation valve room. The three-circuit water pipeline passes through the drainage isolation valve room. An emergency drainage isolation valve is installed on the three-circuit water pipeline in the emergency drainage isolation room.

13. The sodium-cooled reactor three-circuit system according to claim 12, characterized in that: The upper layer of the emergency drainage isolation room is the water supply isolation valve room. The three-circuit water pipeline passes through the water supply isolation valve room. A water supply isolation valve is installed on the three-circuit water pipeline in the water supply isolation valve room.

14. The sodium-cooled reactor three-circuit system according to claim 13, characterized in that: The layer above the water supply isolation valve room is the steam isolation valve room. The three-circuit steam pipeline passes through the steam isolation valve room. Steam isolation valves are installed on the three-circuit steam pipelines in the steam isolation valve room.

15. The sodium-cooled reactor three-circuit system according to claim 14, characterized in that: A steam safety valve room is arranged on the upper layer of the steam isolation valve room. The three-circuit steam pipeline passes through the steam safety valve room. Steam safety valves are installed on the three-circuit steam pipeline in the steam safety valve room.

16. The sodium-cooled reactor three-circuit system according to claim 15, characterized in that: An atmospheric relief valve room is arranged on the upper layer of the steam safety valve room. The three-circuit steam pipeline passes through the atmospheric relief valve room. An atmospheric relief valve is provided on the three-circuit steam pipeline in the atmospheric relief valve room.

17. The sodium-cooled reactor three-circuit system according to claim 16, characterized in that: A silencer platform is arranged on the upper layer of the atmospheric release valve room. A silencer is arranged in the silencer platform and the silencer is connected to the outlet of the atmospheric release valve.

18. The sodium-cooled reactor three-circuit system according to claim 17, characterized in that: The three-circuit steam water supply pipe gallery area includes the three-circuit water supply pipe gallery arranged on the lower level and the three-circuit steam pipe gallery arranged on the upper level, in which: The tertiary water pipeline passes through the water supply isolation valve room in the tertiary steam water supply area and is connected to the steam turbine building of the conventional island through the tertiary water supply corridor. The tertiary water pipeline in the tertiary water supply corridor is equipped with a tertiary water supply regulating valve group. The three-circuit steam pipeline passes through the steam isolation valve in the three-circuit steam water supply area and is connected to the turbine building of the conventional island through the three-circuit steam pipe gallery.

19. The sodium-cooled reactor three-circuit system according to claim 18, characterized in that: The three-circuit system of the sodium-cooled reactor consists of two loops. There are two steam generator blocks, which are located on opposite sides of the reactor building. The three-circuit water pipes in each loop are located at 180° to the sodium pipes in the secondary loop system of the sodium-cooled reactor. The three-circuit water supply corridor and the three-circuit steam corridor are both L-shaped and surround the outside of the reactor building.

20. The sodium-cooled reactor three-circuit system according to claim 18 or 19, characterized in that: The water supply isolation valve room and the steam isolation valve room are nuclear-grade earthquake-resistant buildings, and the three-circuit water supply pipeline gallery and the three-circuit steam pipeline gallery are non-nuclear-grade earthquake-resistant buildings.

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