A nuclear auxiliary building and a method of arranging the same, small pressurized water reactor nuclear power plant

Abstract

The application discloses a layout method of a nuclear auxiliary plant, which is arranged as two underground floors and four overground floors, and process equipment in a primary loop auxiliary system and its supporting system items is arranged in the underground two floors to the overground two floors, and electrical instruments and ventilation equipment in the primary loop auxiliary system and its supporting system items is arranged in the overground three floors to the overground four floors; function area one, function area two and function area three are arranged in each floor respectively, function area one is arranged on a side close to a reactor plant, and primary loop auxiliary system equipment closely related to the reactor plant is arranged in function area one and function area two, and a filter and a desalter compartment with high radioactivity are arranged in function area three and away from an outer wall. The application further discloses a nuclear auxiliary plant and a small-sized pressurized water reactor nuclear power plant. The application is more reasonable in arrangement, greatly reduces items in the plant, reduces overall arrangement difficulty, is more friendly to operation personnel and is more prominent in economy.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power technology, specifically relating to a nuclear auxiliary building and its layout method, and a small pressurized water reactor nuclear power plant. Background Technology

[0002] The energy conversion process in a small pressurized water reactor (PWR) nuclear power plant is as follows: the primary loop transfers the heat energy from the nuclear reaction in the reactor core to the secondary loop, generating supersaturated steam that drives a turbine to rotate and in turn drives a generator to produce electricity. The biggest difference between a nuclear power plant and a conventional thermal power plant is that its steam generation method is through exothermic nuclear reaction. To ensure the normal operation of a nuclear power plant, relatively precise reactivity control of the nuclear reaction is necessary.

[0003] Reactivity control primarily employs control rods and chemical control, with chemical control requiring a large-scale primary loop auxiliary system. The primary loop auxiliary system of a small pressurized water reactor (SWR) nuclear power plant mainly includes chemical and volumetric control systems, residual heat removal systems, nuclear sampling systems, and reactor coolant purification systems. Because these primary loop auxiliary systems are closely integrated with the primary loop, their equipment and piping are highly radioactive. For economic and construction feasibility reasons, the reactor building housing the core and primary loop equipment and piping cannot be too large, limiting its capacity. Therefore, a separate nuclear auxiliary building is necessary to accommodate the large-scale and highly radioactive primary loop auxiliary system components. Furthermore, the nuclear auxiliary building must also house necessary support systems, such as electrical and instrumentation systems, various ventilation systems, and condensate and venting systems, to achieve operational control, environmental maintenance, and byproduct collection of the primary loop auxiliary systems, ensuring their reliable operation.

[0004] Under the existing layout of small pressurized water reactors, the nuclear auxiliary building not only accommodates the necessary primary loop auxiliary systems and their support systems, but also houses the boron recovery system and liquid and solid waste treatment systems. These systems are not directly related to the primary loop, do not operate continuously, and are numerous and large in size, significantly increasing the difficulty of the building layout and raising its size and cost. Furthermore, the existing nuclear auxiliary building layout has at least the following shortcomings: the placement of some items is unreasonable, resulting in excessively long connecting pipelines; the building span is too large, requiring numerous hoisting openings and complicating equipment transportation routes; and a large number of high-radioactivity tanks are located adjacent to the building's exterior walls, adversely affecting radiation protection. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned shortcomings of the existing technology by providing a nuclear auxiliary building and its layout method, and a small pressurized water reactor nuclear power plant. The layout of the nuclear auxiliary building is more reasonable, greatly reduces the items in the building, reduces the overall layout difficulty, is more personnel-friendly, and is more economical.

[0006] The technical solution of the present invention to solve the above-mentioned technical problems is:

[0007] According to a first aspect of the present invention, a method for arranging a nuclear auxiliary plant is provided, comprising:

[0008] In the vertical direction, the nuclear auxiliary plant is arranged as two underground floors and four above-ground floors. The process equipment in the primary loop auxiliary system and its support system items are arranged in the second underground floor to the second above-ground floor, and the electrical, instrumentation and ventilation equipment in the primary loop auxiliary system and its support system items are arranged in the third to fourth above-ground floors.

[0009] In the horizontal direction, functional areas one, two and three are arranged on each floor. Functional area one is located on the side closest to the reactor building. Corridors are arranged between the functional areas. The primary loop auxiliary system equipment that is closely connected to the reactor building is arranged in functional areas one and two. The highly radioactive filters and desalination chambers are arranged in functional area three and away from the outer wall.

[0010] Preferably, in the second basement level, the nuclear sampling system equipment is arranged in functional area one, the pumps and heat exchangers of the waste heat removal system, the charging pumps and boric acid transfer pumps of the chemical and volume control systems, and the front storage tank pumps of the reactor coolant purification system are arranged in functional area two, and the waste liquid temporary storage tanks and transfer pumps, and the waste liquid collection pits of the nuclear island condensate venting system are arranged in functional area three.

[0011] Preferably, the reactor building ventilation system equipment is arranged in functional area one from the first basement level to the second floor above ground; the exhaust gas treatment equipment, the control box for the volume of the chemical and volume control system, the boric acid storage tank, the front storage tank and intermediate storage tank of the reactor coolant purification system are arranged in functional area two; and the degassing tower of the reactor coolant purification system, as well as the filters, desalination devices and corresponding pipe racks and valve rooms of each process system are arranged in functional area three.

[0012] Preferably, within the three floors above ground, the iodine exhaust system equipment is arranged in functional area one, the electrical and instrument cabinets and their control room, and the smoke exhaust room are arranged in functional area two, and the operation hall of the nuclear auxiliary plant is arranged in functional area three.

[0013] Preferably, within the four floors above ground, the air supply and exhaust systems of the nuclear auxiliary plant are arranged in functional areas one and two, and functional area three on the fourth floor is connected to functional area three on the third floor, so that the overhead space of the operating hall of the nuclear auxiliary plant extends all the way to the fourth floor.

[0014] Preferably, this arrangement method further includes: setting up stairwells and / or elevator shafts at opposite corners of the nuclear auxiliary plant, and connecting them via corridors.

[0015] Preferably, the shielded transfer workshop is located on the ground floor, adjacent to the outer wall of the nuclear auxiliary plant, and its gate is connected to the external plant road.

[0016] Preferably, a first hoisting hole is arranged in the stairwell for vertically hoisting small equipment, and a second hoisting hole is arranged directly above the shielded transfer workshop for vertically hoisting large equipment from the second to the fourth floor above ground.

[0017] Preferably, the nuclear auxiliary building adopts a reinforced concrete structure with seismic resistance of Class I and shares the same foundation slab with the reactor building.

[0018] According to a second aspect of the present invention, a nuclear auxiliary plant is provided, comprising two underground floors and four above-ground floors in the vertical direction. The second underground floor to the second above-ground floor are used to arrange process equipment in the primary loop auxiliary system and its support system items, and the third to the fourth above-ground floor are used to arrange electrical and ventilation equipment in the primary loop auxiliary system and its support system items.

[0019] The system includes three functional areas in the horizontal direction: Functional Area 1, Functional Area 2, and Functional Area 3. Functional Area 1 is located on the side closest to the reactor building. Corridors connect the functional areas. Functional Area 1 and Functional Area 2 are used to house primary loop auxiliary system equipment that is closely connected to the reactor building. Functional Area 3 is used to house high-radioactivity filters and desalination compartments.

[0020] Preferably, the corridor includes a first corridor, a second corridor, and a third corridor. The first corridor and the second corridor are respectively located on both sides of functional area two, with the first corridor located between functional area one and functional area two, the second corridor located between functional area two and functional area three, and the third corridor located at one end of functional area two and connected to the first corridor and the second corridor respectively, so that the corridor as a whole is inverted π shape.

[0021] Preferably, one end of functional area one is located adjacent to the reactor building, and the other end is provided with a first stairwell and / or a first elevator shaft. A second stairwell and / or a second elevator shaft is located diagonally opposite the first stairwell and / or the first elevator shaft in the nuclear auxiliary building. The first stairwell and / or the first elevator shaft, the second stairwell and / or the second elevator shaft are all connected to the corridor.

[0022] Preferably, a shielded transfer workshop is located on the ground floor, and the shielded transfer workshop is located adjacent to the outer wall of the nuclear auxiliary plant. Its door is connected to the external plant road and is used for the transfer of solid waste within the nuclear auxiliary plant.

[0023] Preferably, a first hoisting hole is located near the first stairwell and / or the first elevator shaft, and the second stairwell and / or the second elevator shaft, for vertical hoisting of small equipment.

[0024] Preferably, a second hoisting hole is provided directly above the shielded transfer workshop for vertically hoisting large equipment from the second to the fourth floor above ground.

[0025] Preferably, the nuclear auxiliary building adopts a reinforced concrete structure with seismic resistance of Class I and is located on the same floor as the reactor building.

[0026] According to a third aspect of the present invention, a small pressurized water reactor nuclear power plant is provided, comprising a reactor building and a nuclear auxiliary building, wherein the nuclear auxiliary building is arranged using the arrangement method described above, or adopts the same structure as the nuclear auxiliary building described above.

[0027] Beneficial effects:

[0028] The nuclear auxiliary building and its layout method of the present invention, and the small pressurized water reactor nuclear power plant, have at least the following advantages compared with the prior art:

[0029] (1) The nuclear auxiliary plant only has the necessary primary loop auxiliary system and its support system items, which greatly reduces the items in the plant. In addition, combined with the concept of compact layout, the plant structure and item layout are more reasonable, the functional areas are more concentrated, the personnel friendliness is greatly increased, the size of the nuclear auxiliary plant is reduced, the difficulty and cost of plant layout are reduced, and the economy is more prominent.

[0030] (2) The primary loop auxiliary system equipment closely connected to the reactor building, such as the nuclear sampling cooler, the coolant receiving tank, and the residual heat exchanger, are all arranged in functional areas one and two near the reactor building. This shortens the length of the radioactive pipeline, which helps to reduce the cost of bulk materials and facilitates radiation protection.

[0031] (3) The high-radioactivity filters, desalination chambers and other purification equipment and supporting facilities are centrally arranged in functional area three, and are not close to the outer wall. This facilitates the centralized maintenance and operation of the filters and desalination equipment, and is also conducive to radiation protection.

[0032] (4) The structure of the nuclear auxiliary plant is regular and neat, and the main walls of the upper and lower floors are aligned, which reduces the difficulty of plant structure design and construction and helps to reduce project cost. Attached Figure Description

[0033] Figure 1 This is a plan view of the nuclear auxiliary plant according to an embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the floor plan of the second basement level of the nuclear auxiliary plant according to an embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of the floor plan of the nuclear auxiliary plant from the basement to the second floor above ground, according to an embodiment of the present invention.

[0036] Figure 4 This is a schematic diagram of the three-story above-ground layout of the nuclear auxiliary plant according to an embodiment of the present invention;

[0037] Figure 5 This is a schematic diagram of the four-story above-ground layout of the nuclear auxiliary plant according to an embodiment of the present invention.

[0038] In the diagram: 1. Functional Area 1; 2. Functional Area 2; 3. Functional Area 3; 4. First Corridor; 5. Second Corridor; 6. Third Corridor; 7. First Staircase; 8. Second Staircase. Detailed Implementation

[0039] To enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present invention.

[0040] In the description of this invention, it should be noted that the terms "above" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0041] In the description of this invention, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0042] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "setting," "installation," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] This invention discloses a method for arranging a nuclear auxiliary plant, comprising:

[0044] In the vertical direction, the nuclear auxiliary plant is arranged as two underground floors and four above-ground floors. The process equipment in the primary loop auxiliary system and its support system items are arranged in the second underground floor to the second above-ground floor, and the electrical, instrumentation and ventilation equipment in the primary loop auxiliary system and its support system items are arranged in the third to fourth above-ground floors.

[0045] In the horizontal direction, functional areas one, two and three are arranged on each floor. Functional area one is located on the side closest to the reactor building. Corridors are arranged between the functional areas. The primary loop auxiliary system equipment that is closely connected to the reactor building is arranged in functional areas one and two. The highly radioactive filters and desalination chambers are arranged in functional area three and away from the outer wall.

[0046] Accordingly, the present invention also discloses a nuclear auxiliary plant, which includes two underground floors and four above-ground floors in the vertical direction. The second underground floor to the second above-ground floor are used to arrange the process equipment in the primary loop auxiliary system and its support system items, and the third to the fourth above-ground floor are used to arrange the electrical and instrumentation and ventilation equipment in the primary loop auxiliary system and its support system items.

[0047] The system includes three functional areas in the horizontal direction: Functional Area 1, Functional Area 2, and Functional Area 3. Functional Area 1 is located on the side closest to the reactor building. Corridors connect the functional areas. Functional Area 1 and Functional Area 2 are used to house primary loop auxiliary system equipment that is closely connected to the reactor building. Functional Area 3 is used to house high-radioactivity filters and desalination compartments.

[0048] Accordingly, the present invention also discloses a small pressurized water reactor nuclear power plant, which includes a reactor building and a nuclear auxiliary building. The nuclear auxiliary building is arranged in accordance with the above-described layout method, or adopts the same structure as the above-described nuclear auxiliary building.

[0049] Example 1

[0050] like Figure 1-5 As shown in the figure, this embodiment discloses a method for arranging a nuclear auxiliary plant, including:

[0051] In the vertical direction, the nuclear auxiliary plant is arranged into two underground floors and four above-ground floors, for a total of six floors. The process equipment (especially the main process equipment) in the primary loop auxiliary system and its support system items are arranged in the second underground floor to the second above-ground floor, that is, the second underground floor to the second above-ground floor is the process equipment floor. The electrical instrumentation and ventilation equipment (especially the main electrical instrumentation and ventilation equipment) in the primary loop auxiliary system and its support system items are arranged in the third above-ground floor to the fourth above-ground floor, that is, the third above-ground floor to the fourth above-ground floor is the electrical instrumentation and HVAC equipment floor.

[0052] In the horizontal direction, functional areas 1, 2, and 3 are arranged on each floor. Functional area 1 is located on the side closest to the reactor building, with one end of functional area 1 adjacent to the reactor building. Corridors are arranged between the functional areas. The primary loop auxiliary system equipment, which is closely connected to the reactor building, is arranged in functional area 1 and functional area 2. This shortens the length of radioactive pipes, which helps to reduce the cost of bulk materials and radiation protection. Highly radioactive filters, desalination chambers, and other purification equipment and supporting facilities are arranged in functional area 3 and away from the outer wall. This facilitates centralized maintenance and operation of filters and desalination chambers, is beneficial to radiation protection, and greatly increases personnel friendliness.

[0053] Specifically, the primary loop auxiliary systems and their support systems include the chemical and volume control systems, the residual heat removal system, the nuclear sampling system, the reactor coolant purification system, as well as the nuclear auxiliary building's air supply, exhaust, iodine exhaust, fume extraction, and reactor building ventilation systems, and necessary electrical and instrumentation cabinets, etc. The primary loop auxiliary system equipment closely connected to the reactor building includes the nuclear sampling cooler, the coolant pre-receiving tank, and the residual heat exchanger, etc.

[0054] like Figure 1-5 As shown, Functional Area 1, Functional Area 2, and Functional Area 3 correspond to the left, center, and right functional areas, respectively. The corridors include First Corridor 4, Second Corridor 5, and Third Corridor 6. First Corridor 4 is arranged between Functional Area 1 and Functional Area 2, and Second Corridor 5 is arranged between Functional Area 2 and Functional Area 3. First Corridor 4 and Second Corridor 5 are preferably arranged parallel to each other. Third Corridor 6 is arranged at one end of Functional Area 2 and perpendicular to the same end of First Corridor 4 and Second Corridor 5. First Corridor 4 and Second Corridor 5 are connected through Third Corridor 6, and the overall shape of the corridors is an inverted π shape. The walls of Functional Area 1, Functional Area 2, and Functional Area 3 on the upper and lower floors, as well as their internal structures, are aligned, at least the main walls. Compared to existing technologies, the layout method of this embodiment makes the structure of the nuclear auxiliary plant more regular and orderly, thereby reducing design and construction difficulty and helping to reduce project costs.

[0055] In some implementations, such as Figure 2 As shown, on the second basement level, the nuclear sampling system equipment is located in Functional Area 1; the pumps and heat exchangers of the waste heat removal system, the charging pumps and boric acid transfer pumps of the chemical and volumetric control systems, and the pre-storage tank pumps of the reactor coolant purification system are located in Functional Area 2; and the waste liquid temporary storage tanks and transfer pumps, the waste liquid collection pit of the nuclear island condensate venting system, and other purification equipment and supporting facilities are located in Functional Area 3. The layout of each functional area depends on the specific circumstances and will not be described in detail here.

[0056] In some implementations, such as Figure 3As shown, from the basement level to the second floor above ground, the reactor building's ventilation system equipment (such as blowers and exhaust fans) is located in Functional Area 1. The waste gas treatment equipment, the control boxes for the chemical and volumetric control systems, the boric acid storage tank, and the pre- and intermediate storage tanks of the reactor coolant purification system are located in Functional Area 2. The degassing tower of the reactor coolant purification system, along with filters, desalination devices, and corresponding pipe racks, valve rooms, and other purification equipment and supporting facilities for each process system, are located in Functional Area 3. The specific layout within each functional area depends on the specific circumstances and will not be detailed here.

[0057] In some implementations, such as Figure 4 As shown, within the three floors above ground, the iodine exhaust system equipment is located in Functional Area 1 (1), the electrical and instrumentation cabinets and their control room, and the smoke exhaust fan room are located in Functional Area 2 (2), and the operating hall of the nuclear auxiliary plant is located in Functional Area 3 (3). Filter cartridge replacement and transfer, resin addition, and other operations are carried out in this operating hall. The layout within each functional area depends on the specific circumstances and will not be detailed here.

[0058] In some implementations, such as Figure 5 As shown, within the four floors above ground, the air supply and exhaust systems of the nuclear auxiliary plant are arranged in functional area 1 and functional area 2. Functional area 3 on the fourth floor is connected to functional area 3 on the third floor, extending the overhead space of the nuclear auxiliary plant's operating hall all the way to the fourth floor. The layout of each functional area depends on the specific circumstances and will not be described in detail here.

[0059] In some embodiments, this arrangement method further includes: setting up stairwells and / or elevator shafts at opposite corners of the nuclear auxiliary plant, which are connected by corridors to provide access to all floors of the plant. The stairwells on the ground floor are equipped with escape doors connecting to the outside of the plant to facilitate normal personnel passage and emergency evacuation.

[0060] In this embodiment, it is preferable to arrange two staircases and one elevator, that is, to provide two stairwells (e.g., Figure 1 As shown, there are a first stairwell 7 and a second stairwell 8, and an elevator shaft, respectively. The elevator shaft is preferably located in a diagonal position near functional area 1.

[0061] During the operation and maintenance of the nuclear power plant, personnel must enter the nuclear auxiliary building through the sanitary entrance of the auxiliary building and reach each floor via stairs and elevators. In case of emergency, personnel on the underground and above-ground floors first reach the ground floor through the stairwell, and then reach the outside of the plant through the escape door of the stairwell (second stairwell 8), or escape through the stairwell (first stairwell 7) into the auxiliary building.

[0062] In some embodiments, this arrangement method further includes: arranging a shielded transfer workshop on the ground floor, the shielded transfer workshop being arranged adjacent to the outer wall of the nuclear auxiliary plant, and its door being connected to the external plant area road for the transfer of solid waste within the nuclear auxiliary plant.

[0063] In some embodiments, this arrangement method further includes: arranging several hoisting holes within the nuclear auxiliary building.

[0064] In this embodiment, it is preferable to arrange a first hoisting hole in the stairwell for vertically hoisting small equipment, and arrange a second hoisting hole directly above the shielded transfer workshop for vertically hoisting large equipment from the second to the fourth floor above ground.

[0065] In some implementations, the nuclear auxiliary building is constructed of reinforced concrete with seismic resistance rating Class I and shares the same foundation slab with the reactor building to improve its seismic resistance.

[0066] The layout method of the nuclear auxiliary plant in this embodiment has at least the following advantages compared with the prior art:

[0067] (1) The nuclear auxiliary plant only has the necessary primary loop auxiliary system and its support system items, which greatly reduces the items in the plant. In addition, combined with the concept of compact layout, the plant structure and item layout are more reasonable, the functional areas are more concentrated, the personnel friendliness is greatly increased, the size of the nuclear auxiliary plant is reduced, the difficulty and cost of plant layout are reduced, and the economy is more prominent.

[0068] (2) The primary loop auxiliary system equipment closely connected to the reactor building, such as the nuclear sampling cooler, the coolant receiving tank, and the residual heat exchanger, are all arranged in functional areas one and two near the reactor building. This shortens the length of the radioactive pipeline, which helps to reduce the cost of bulk materials and facilitates radiation protection.

[0069] (3) The high-radioactivity filters, desalination chambers and other purification equipment and supporting facilities are centrally arranged in functional area three, and are not close to the outer wall. This facilitates the centralized maintenance and operation of the filters and desalination equipment, and is also conducive to radiation protection.

[0070] (4) The structure of the nuclear auxiliary plant is regular and neat, and the main walls of the upper and lower floors are aligned, which reduces the difficulty of plant structure design and construction and helps to reduce project cost.

[0071] Example 2

[0072] like Figure 1-5As shown, this embodiment discloses a nuclear auxiliary plant, which is arranged using the layout method described in Embodiment 1. Specifically, it includes two underground floors and four above-ground floors in the vertical direction, for a total of six layout floors. The second underground floor to the second above-ground floor are used to arrange the process equipment (especially the main process equipment) in the primary loop auxiliary system and its support system items. The third above-ground floor to the fourth above-ground floor are used to arrange the electrical and instrumentation and ventilation equipment (especially the main electrical and instrumentation and ventilation equipment) in the primary loop auxiliary system and its support system items.

[0073] The system includes functional area 1, functional area 2, and functional area 3 in the horizontal direction. Functional area 1 is located on the side close to the reactor building, and one end of functional area 1 is adjacent to the reactor building. There are corridors between the functional areas. Functional areas 1 and 2 are used to arrange primary loop auxiliary system equipment that is closely connected to the reactor building. Functional area 3 is used to arrange high-radioactivity filter and desalination compartments.

[0074] Specifically, the primary loop auxiliary systems and their support systems include the chemical and volume control systems, the residual heat removal system, the nuclear sampling system, the reactor coolant purification system, as well as the nuclear auxiliary building's air supply, exhaust, iodine exhaust, fume extraction, and reactor building ventilation systems, and necessary electrical and instrumentation cabinets, etc. The primary loop auxiliary system equipment closely connected to the reactor building includes the nuclear sampling cooler, the coolant pre-receiving tank, and the residual heat exchanger, etc.

[0075] In this embodiment, as Figure 2 As shown, for the second underground floor, functional area 1 is mainly used to arrange nuclear sampling system equipment; functional area 2 is mainly used to arrange pumps and heat exchangers for the waste heat removal system, charging pumps and boric acid transfer pumps for the chemical and volume control systems, and front storage tank pumps for the reactor coolant purification system; functional area 3 is mainly used to arrange waste liquid temporary storage tanks and transfer pumps, waste liquid collection pits for the nuclear island condensate venting system, and other purification equipment and supporting facilities. The layout within each functional area depends on the specific circumstances.

[0076] In this embodiment, as Figure 3 As shown, for the first basement level to the second floor above ground, functional area 1 is mainly used to arrange the reactor building ventilation system equipment; functional area 2 is mainly used to arrange the exhaust gas treatment equipment, the control box for the volume of the chemical and volume control system, the boric acid storage tank, the front storage tank and intermediate storage tank of the reactor coolant purification system; functional area 3 is mainly used to arrange the degassing tower of the reactor coolant purification system, as well as the filters, desalination devices and corresponding pipe corridors, valve rooms and other purification equipment and supporting facilities of each process system. The layout of each functional area is determined according to the specific situation.

[0077] In this embodiment, as Figure 4As shown, for the three floors above ground, functional area 1 is mainly used to arrange the iodine exhaust system equipment, functional area 2 is mainly used to arrange the electrical and instrument cabinets and their control room, smoke exhaust room, and functional area 3 is mainly used to arrange the operation hall of the nuclear auxiliary plant, where operations such as filter element replacement and transfer, and resin addition are carried out.

[0078] In this embodiment, as Figure 5 As shown, for the fourth floor above ground, functional areas 1 and 2 are mainly used to arrange the air supply and exhaust system equipment of the nuclear auxiliary plant. Functional area 3 is connected to functional area 3 on the third floor above ground, so that the space above the operating hall of the nuclear auxiliary plant extends all the way to the fourth floor above ground.

[0079] In some implementations, such as Figure 1-5 As shown, Functional Area 1, Functional Area 2, and Functional Area 3 correspond to the left, center, and right functional areas, respectively. The corridor includes a first corridor 4, a second corridor 5, and a third corridor 6. The first corridor 4 and the second corridor 5 are located on opposite sides of Functional Area 2, with the first corridor 4 situated between Functional Area 1 and Functional Area 2, and the second corridor 5 situated between Functional Area 2 and Functional Area 3. Preferably, the first corridor 4 and the second corridor 5 are arranged in parallel. The third corridor 6 is located at one end of Functional Area 2 and connects to the same end of both the first corridor 4 and the second corridor 5, resulting in an overall inverted π-shaped corridor. The walls of Functional Area 1, Functional Area 2, and Functional Area 3 on both upper and lower floors, as well as their internal structures, are aligned, at least the main walls. Compared to existing technologies, the nuclear auxiliary plant in this embodiment has a regular and orderly structure, which reduces design and construction difficulty and helps to lower project costs.

[0080] In some embodiments, one end of functional area 1 is located adjacent to the reactor building, and the other end of functional area 1 is provided with a first stairwell 7 and / or a first elevator shaft. A second stairwell 8 and / or a second elevator shaft is located diagonally opposite the first stairwell 7 and / or the first elevator shaft in the nuclear auxiliary building. The first stairwell 7 and / or the first elevator shaft, and the second stairwell 8 and / or the second elevator shaft are all connected to a corridor to facilitate personnel passage.

[0081] In some implementations, a shielded transfer workshop is located on the ground floor, and the shielded transfer workshop is arranged adjacent to the outer wall of the nuclear auxiliary plant. Its door is connected to the external plant road and is used for the transfer of solid waste within the nuclear auxiliary plant.

[0082] In some embodiments, a first hoisting hole is provided near the first stairwell 7 and / or the first elevator shaft, and the second stairwell 8 and / or the second elevator shaft for vertically hoisting small equipment.

[0083] In some implementations, a second hoisting hole is provided directly above the shielded transfer workshop for vertically hoisting large equipment from the second to the fourth floor above ground.

[0084] In some implementations, the nuclear auxiliary building is constructed of reinforced concrete with seismic resistance rating Class I and is situated on the same foundation slab as the reactor building to enhance its seismic resistance.

[0085] Example 3

[0086] This embodiment discloses a small pressurized water reactor nuclear power plant, which includes a reactor building and a nuclear auxiliary building. The nuclear auxiliary building is arranged using the layout method of the nuclear auxiliary building described in Embodiment 1, or it adopts the same structure as the nuclear auxiliary building described in Embodiment 2.

[0087] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A method for arranging a nuclear auxiliary building, comprising: In the vertical direction, the nuclear auxiliary building is arranged with two underground floors and four above-ground floors. The process equipment in the primary loop auxiliary system and its support system items is arranged in the second underground floor to the second above-ground floor, and the electrical, instrumentation and ventilation equipment in the primary loop auxiliary system and its support system items is arranged in the third to fourth above-ground floors. The process equipment in the primary loop auxiliary system and its support system items includes chemical and volume control systems, residual heat removal systems, nuclear sampling systems, and reactor coolant purification systems. The electrical, instrumentation and ventilation equipment in the primary loop auxiliary system and its support system items includes nuclear auxiliary building air supply, exhaust, iodine exhaust, smoke exhaust, reactor building ventilation system, and electrical and instrumentation control cabinets. In the horizontal direction, functional areas 1 (1), 2 (2) and 3 (3) are arranged on each floor. Functional area 1 is located on the side close to the reactor building. Corridors are arranged between the functional areas. The primary loop auxiliary system equipment closely connected to the reactor building is arranged in functional area 1 and functional area 2. The high radioactivity filter and desalination compartment is arranged in functional area 3 and away from the outer wall. The primary loop auxiliary system equipment closely connected to the reactor building includes nuclear sampling cooler, coolant receiving tank, and residual heat exchanger. The corridor includes first corridor (4), second corridor (5) and third corridor (6). The first corridor is arranged between functional area 1 and functional area 2. The second corridor is arranged between functional area 2 and functional area 3. The third corridor is arranged at one end of functional area 2. The first corridor and the second corridor are connected through the third corridor. The overall shape of the corridor is an inverted π shape.

2. The method for arranging a nuclear auxiliary plant according to claim 1, characterized in that, The nuclear sampling system equipment is located in functional area one on the second basement level. The pumps and heat exchangers of the waste heat removal system, the charging pumps and boric acid transfer pumps of the chemical and volumetric control systems, and the front storage tank pumps of the reactor coolant purification system are arranged in functional area two. Waste liquid temporary storage tanks and transfer pumps, as well as waste liquid collection pits of the nuclear island condensate and exhaust system, are located in functional area three.

3. The method for arranging a nuclear auxiliary plant according to claim 1, characterized in that, The reactor building's ventilation system equipment is located in functional area one, spanning from the basement level to the second floor. The waste gas treatment equipment, the control box for the volume of the chemical and volumetric control system, the boric acid storage tank, and the front and intermediate storage tanks of the reactor coolant purification system are arranged in functional area two. The degassing tower of the reactor coolant purification system, as well as the filters, desalination devices, and corresponding pipe racks and valve rooms of each process system, are arranged in functional area three.

4. The method for arranging a nuclear auxiliary plant according to claim 1, characterized in that, Within the three floors above ground, the iodine exhaust system equipment will be located in functional area one. The electrical instrument cabinets, their control room, and the smoke exhaust fan room are located in functional area two. The operation hall of the nuclear auxiliary plant is located in functional area three.

5. The method for arranging a nuclear auxiliary plant according to claim 1, characterized in that, Within the four floors above ground, the air supply and exhaust systems of the nuclear auxiliary plant are located in functional area one and functional area two. Connect the third functional area on the fourth floor with the third functional area on the third floor, so that the overhead space of the nuclear auxiliary plant’s operating hall extends all the way to the fourth floor.

6. The method for arranging a nuclear auxiliary plant according to any one of claims 1-5, characterized in that, Also includes: Stairwells and / or elevator shafts are located at opposite corners of the nuclear auxiliary plant and are connected by corridors.

7. The method for arranging a nuclear auxiliary plant according to claim 6, characterized in that, The shielded transfer workshop is located on the ground floor and is situated adjacent to the outer wall of the nuclear auxiliary plant. Its main entrance is connected to the external plant area roads.

8. The method for arranging a nuclear auxiliary plant according to claim 7, characterized in that, The first hoisting hole is arranged in the stairwell for vertically hoisting small equipment, and the second hoisting hole is arranged directly above the shielded transfer workshop for vertically hoisting large equipment from the second to the fourth floor above ground.

9. The method for arranging a nuclear auxiliary plant according to claim 8, characterized in that, The nuclear auxiliary building adopts a reinforced concrete structure with seismic resistance level I and shares the same foundation slab with the reactor building.

10. A nuclear auxiliary plant, characterized in that, The structure includes two underground floors and four above-ground floors. The second underground floor to the second above-ground floor are used to house the process equipment in the primary loop auxiliary system and its support system items. The third and fourth above-ground floors are used to house the electrical, instrumentation and ventilation equipment in the primary loop auxiliary system and its support system items. The process equipment in the primary loop auxiliary system and its support system items includes chemical and volume control systems, waste heat removal systems, nuclear sampling systems, and reactor coolant purification systems. The electrical, instrumentation and ventilation equipment in the primary loop auxiliary system and its support system items includes air supply and exhaust systems for the nuclear auxiliary plant, iodine exhaust systems, smoke exhaust systems, reactor plant ventilation systems, and electrical and instrumentation control cabinets. The horizontal direction includes functional area 1 (1), functional area 2 (2) and functional area 3 (3). Functional area 1 is located on the side close to the reactor building. There is a corridor between each functional area. Functional area 1 and functional area 2 are used to arrange primary loop auxiliary system equipment closely connected to the reactor building. Functional area 3 is used to arrange high radioactive filters and desalination compartments. Among them, the primary loop auxiliary system equipment closely connected to the reactor building includes nuclear sampling cooler, coolant receiving tank, and residual exhaust heat exchanger. The corridor includes first corridor (4), second corridor (5) and third corridor (6). The first corridor and the second corridor are respectively located on both sides of functional area 2. The first corridor is located between functional area 1 and functional area 2, the second corridor is located between functional area 2 and functional area 3, and the third corridor is located at one end of functional area 2 and is connected to the first corridor and the second corridor respectively, so that the corridor as a whole is inverted π shape.

11. The nuclear auxiliary plant according to claim 10, characterized in that, Functional area one is located adjacent to the reactor building at one end, and a first stairwell (7) and / or a first elevator shaft is located at the other end. A second stairwell (8) and / or a second elevator shaft is located diagonally opposite the first stairwell and / or the first elevator shaft in the nuclear auxiliary building. The first stairwell and / or the first elevator shaft, and the second stairwell and / or the second elevator shaft are all connected to the corridor.

12. The nuclear auxiliary plant according to claim 11, characterized in that, The ground floor houses a shielded transfer workshop, which is located adjacent to the outer wall of the nuclear auxiliary plant. Its main entrance connects to the external plant roads and is used for the transfer of solid waste within the nuclear auxiliary plant.

13. The nuclear auxiliary plant according to claim 12, characterized in that, The first hoisting hole is located near the first stairwell and / or the first elevator shaft, and the second stairwell and / or the second elevator shaft, for vertical hoisting of small equipment; A second hoisting hole is located directly above the shielded transfer workshop, used for vertically hoisting large equipment from the second to the fourth floor above ground.

14. The nuclear auxiliary plant according to claim 13, characterized in that, The nuclear auxiliary building is a reinforced concrete structure with seismic resistance level I and is located on the same floor as the reactor building.

15. A small pressurized water reactor nuclear power plant, comprising a reactor building and a nuclear auxiliary building, characterized in that, The nuclear auxiliary plant is arranged using the layout method of the nuclear auxiliary plant according to any one of claims 1-9, or it adopts the same structure as the nuclear auxiliary plant according to any one of claims 10-14.

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