Pressure relief pool, primary loop pressure stabilizing system and reactor building

Abstract

The utility model discloses a pressure relief pool, a loop pressure stabilizing system and a reactor building, which can set the volume of the pressure relief pool to be larger so as to meet the pressure relief requirement of high-temperature and high-pressure fluid with larger volume, so that the pressure relief pool can be applied to the reactor building with more discharge requirements. And the irradiation harm to the operation and maintenance personnel during the maintenance of the pressure relief water tank is reduced. The pressure relief pool comprises a pressure relief pool body (1) and a pressure relief pool body (2). The inner cavity is filled with a liquid coolant, and a gas space is reserved above the liquid coolant. At least one pressure relief pipeline (8) is fixed in the pressure relief pool body (1); an inlet of the pressure relief pipeline (8) penetrates through the upper wall of the pressure relief pool body (1) and is communicated with the outside, and an outlet of the pressure relief pipeline (8) is immersed below the liquid level of the liquid coolant; the flow area of the outlet of the pressure relief pipeline (8) is larger than that of the inlet of the pressure relief pipeline (8).

Description

TECHNICAL FIELD

[0001] The utility model belongs to nuclear power technology field, concretely relates to a pressure relief pool, one loop pressure regulating system and reactor building. BACKGROUND

[0002] In the nuclear power plant technical scheme, the pressure relief system in the reactor building is indispensable, and the existing technology usually uses a pressure relief water tank for pressure relief.

[0003] In the reactor building with more discharge requirements, the pressure relief system also needs to ensure the carrying volume of the drainage of the one loop, the residual discharge, the chemical containment or other systems with discharge requirements, but due to the limitation of the material strength of the pressure relief water tank, the volume of the pressure relief water tank is difficult to be large (the volume of the pressure relief water tank is usually less than 10 m 3 ), which leads to the fact that the existing pressure relief water tank cannot be used in the reactor building with more discharge requirements.

[0004] In addition, due to the high radioactivity of the pressure relief water tank, the existing pressure relief water tank is usually arranged in a shielding room, and when the pressure relief water tank needs to be maintained, the operation and maintenance personnel need to enter the shielding room and be exposed to the high radioactivity environment, thereby increasing the radiation harm suffered by the operation and maintenance personnel when the pressure relief water tank is maintained. UTILITY MODEL CONTENTS

[0005] The utility model solves the technical problems existing in the prior art, provides a pressure relief pool, one loop pressure regulating system and reactor building, can set the volume of the pressure relief pool to be large to meet the pressure relief requirements of high-temperature and high-pressure fluid with large volume, can apply the pressure relief pool in the reactor building with more discharge requirements, and can reduce the radiation harm suffered by the operation and maintenance personnel when the pressure relief pool is maintained.

[0006] In the first aspect, the utility model embodiment provides a pressure relief pool, and the pressure relief pool comprises a pressure relief pool body and a pressure relief pool body. The pressure relief pool body is arranged in the reactor building, and a closed space is formed in the inner cavity of the pressure relief pool body; the inner cavity is filled with a liquid coolant, and a gas space is reserved above the liquid coolant. At least one pressure relief pipeline is fixed in the pressure relief pool body; the inlet of the pressure relief pipeline communicates with the outside through the upper wall of the pressure relief pool body, the outlet of the pressure relief pipeline is immersed below the liquid level of the liquid coolant; the flow area of the outlet of the pressure relief pipeline is greater than the flow area of the inlet of the pressure relief pipeline. The high-temperature and high-pressure fluid outside enters the inner cavity through the inlet of the pressure relief pipeline, is relieved in the pressure relief pipeline and the liquid coolant, and is finally released into the gas space.

[0007] In some embodiments, the pressure relief pipeline has at least one bend for reducing the flow rate of the high-temperature and high-pressure fluid flowing through the bend.

[0008] In some embodiments, at least one pressure relief pipe is arranged on the pressure relief pipeline, the pressure relief pipe is bent and communicates with the pressure relief pipeline, and an outlet of the pressure relief pipe is submerged below the liquid level of the liquid coolant, so as to divert and relieve the high-temperature and high-pressure fluid in the pressure relief pipeline.

[0009] In some embodiments, a vertical vent hole is arranged on the top of the pressure relief pool body, and the vent hole is used for communicating the gas space with external air.

[0010] In some embodiments, the pressure relief pool further comprises a high-water-level discharge pipe. The high-water-level discharge pipe is horizontally arranged on the upper portion of the pressure relief pool body and communicates with the inner cavity of the pressure relief pool body after penetrating through the sidewall of the pressure relief pool body; the liquid coolant in the inner cavity that is higher than the high-water-level discharge pipe is discharged to the outside of the pressure relief pool through the high-water-level discharge pipe.

[0011] In some embodiments, a manhole that communicates with the inner cavity is arranged on the top of the pressure relief pool body, and a closable cover plate is arranged on the pressure relief pool body corresponding to the position of the manhole. The pressure relief pool further comprises a vertical ladder, which is arranged in the inner cavity of the pressure relief pool body and located below the manhole.

[0012] In some embodiments, a pit is arranged on the bottom of the inner cavity of the pressure relief pool body. The pressure relief pool further comprises an emptying pipe, which is transversely arranged on the bottom of the pressure relief pool body and communicates with the pit after penetrating through the sidewall of the pressure relief pool body, so as to empty the liquid coolant in the inner cavity.

[0013] In some embodiments, an anti-corrosion structure is arranged on the wall surface of the inner cavity of the pressure relief pool body. The thickness a of the anti-corrosion structure satisfies 400mm≤a≤2000mm.

[0014] In some embodiments, the volume C1 of the inner cavity satisfies 0.1m 3 ≤C1≤1000m 3 ; the volume C2 of the gas space satisfies 0.1m 3 <C2<1000m 3 , and C2

[0015] In some embodiments, the liquid coolant is desalted water; and / or, the temperature of the liquid coolant is less than or equal to 50℃ before the high-temperature and high-pressure fluid enters the pressure relief tank; and / or, the ratio of the flow area of the outlet of the pressure relief pipeline to the flow area of the inlet of the pressure relief pipeline is b, and 1.5≤b≤3.

[0016] Therefore, the pressure relief tank in the embodiment of the present application can reduce the radiation harm to the maintenance personnel when the maintenance is performed on the pressure relief tank, because the pressure relief tank body can shield the radioactivity inside. By setting at least one pressure relief pipeline in the pressure relief tank body, and making the flow area of the outlet of the pressure relief pipeline greater than the flow area of the inlet of the pressure relief pipeline, the flow rate of the external high-temperature and high-pressure fluid after entering the pressure relief pipeline through the inlet of the pressure relief pipeline can be reduced, and the pressure can be gradually reduced, so that the purpose of pressure relief is achieved. By setting the liquid coolant in the inner cavity of the pressure relief tank body, and making the outlet of the pressure relief pipeline submerged below the liquid level of the liquid coolant, the resistance of the high-temperature and high-pressure fluid flowing out of the outlet of the pressure relief pipeline can be increased, so that the flow rate of the high-temperature and high-pressure fluid is reduced, and the purpose of pressure relief is achieved. The liquid coolant can also cool the high-temperature and high-pressure fluid after the speed is reduced, so that the high-temperature steam in the high-temperature and high-pressure fluid is liquefied after being cooled, which is beneficial to reducing the total volume of the high-temperature and high-pressure fluid, so as to reduce the pressure of the high-temperature and high-pressure fluid, and achieve the purpose of pressure relief. Finally, the gaseous substances remaining in the high-temperature and high-pressure fluid leak into the gas space to continue to relieve pressure. In summary, the pressure relief tank in the embodiment of the present application can cool, depressurize and slow down the high-temperature and high-pressure fluid, so as to achieve the purpose of pressure relief. Compared with the pressure relief tank in the prior art, the strength of the pressure relief tank body in the embodiment of the present application is higher, so that the size of the pressure relief tank body can be set larger, the volume of the sealed space formed by the inner cavity of the pressure relief tank body is larger, and more liquid coolant and a larger gas space can be set, so that a larger capacity of high-temperature and high-pressure fluid can be received for pressure relief, and the pressure relief tank can be used in a reactor plant with more discharge requirements.

[0017] In a second aspect, the embodiment of the present application further provides a one-loop pressure stabilizing system, which comprises a pressure stabilizer and the pressure relief tank in the first aspect. The pressure stabilizer is arranged on a main pipeline of a one-loop. The pressure relief tank is in communication with the pressure stabilizer through a safety valve, and is used to receive the high-temperature and high-pressure fluid in the pressure stabilizer when the safety valve is opened, so as to relieve the pressure of the high-temperature and high-pressure fluid.

[0018] In a second aspect, the embodiment of the present application further provides a reactor plant, which comprises a containment, a one-loop and the one-loop pressure stabilizing system in the second aspect. The one-loop is arranged in the containment, and the pressure of the high-temperature and high-pressure fluid in the main pipeline of the one-loop is Q, and 14MPa≤Q≤16MPa.

[0019] The primary loop pressure stabilizing system and the reactor building provided by the embodiment of the utility model have the same beneficial effects as the pressure relief pool, which will not be described here. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a schematic diagram of a pressure relief pool provided by the embodiment of the utility model;

[0021] Figure 2 It is a schematic diagram of a pressure relief pipeline in a pressure relief pool provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0022] In order for those skilled in the art to better understand the technical scheme of the utility model, the utility model will be further described in detail below in combination with the drawings and embodiments.

[0023] Embodiment 1:

[0024] As shown in the drawings, Figure 1 The utility model embodiment provides a pressure relief pool, which is applied to a pressure relief system of a primary loop and is used for relieving pressure of high-temperature and high-pressure fluid entering the pressure relief pool.

[0025] As shown in the drawings, Figure 1 and Figure 2 The pressure relief pool comprises a pressure relief pool body 1 and at least one pressure relief pipeline 8. The pressure relief pool body 1 is arranged in a reactor building, and an inner cavity of the pressure relief pool body 1 forms a sealed space; the inner cavity is filled with liquid coolant, and a gas space is reserved above the liquid coolant. The at least one pressure relief pipeline 8 is fixed in the pressure relief pool body 1; an inlet of the pressure relief pipeline 8 communicates with the outside through an upper wall of the pressure relief pool body 1, and an outlet of the pressure relief pipeline 8 is immersed below a liquid level of the liquid coolant; a flow area of the outlet of the pressure relief pipeline 8 is greater than a flow area of the inlet of the pressure relief pipeline 8. High-temperature and high-pressure fluid from the outside enters the inner cavity through the inlet of the pressure relief pipeline 8, is relieved in the pressure relief pipeline 8 and the liquid coolant, and is finally released into the gas space.

[0026] It can be understood that the structure of the pressure relief pool body 1 is a concrete structure, so that the radioactivity inside the pressure relief pool body 1 can be shielded, and the pressure relief pool body 1 does not need to be arranged in a separate shielding room, so that maintenance personnel can maintain the pressure relief pool outside the pressure relief pool body 1, and thus the radiation harm to the maintenance personnel when the pressure relief pool is maintained can be reduced.

[0027] The pressure relief pool body 1 can be built at the same time when the reactor building is built.

[0028] Because the pressure relief pool body 1 can be through the outer wall and the outside space (reactor plant wall or the air in the reactor plant) through heat convection and heat conduction to realize heat exchange, when the outside high temperature and high pressure fluid does not enter the inner cavity of the pressure relief pool body 1, the temperature of the gas space and the liquid coolant inside can be maintained at a lower temperature (for example, maintained at 49 DEG C).

[0029] Exemplarily, the material of the pressure relief pipeline 8 can be corrosion-resistant and high-strength metal materials such as stainless steel and low alloy steel.

[0030] Exemplarily, the pressure relief pipeline 8 is fixed on the inner wall of the inner cavity of the pressure relief pool body 1 directly or through a support / plate by welding, riveting or bolt connection and the like.

[0031] Exemplarily, the number of the pressure relief pipeline 8 can be one, two or three and the like. Figure 2 Two pressure relief pipelines 8 are shown in the figure, and the inlets of the two pressure relief pipelines 8 pass through the upper wall of the pressure relief pool body 1 and communicate with the outside (for example, the pressurizer).

[0032] Exemplarily, a plurality of external interfaces 9 are further arranged on the pressure relief pool body 1, the plurality of external interfaces 9 can receive high temperature and high pressure fluid from an external system (device) or a plurality of external systems (devices), the pressure relief pipeline 8 on the pressure relief pool body 1 communicates with the outside (for example, the pressurizer and the like) through the external interface 9, and a check valve is further arranged on the external interface 9 to prevent backflow.

[0033] Exemplarily, the form of the external high temperature and high pressure fluid can include at least one of gas, steam and liquid.

[0034] Exemplarily, the temperature of the high temperature and high pressure fluid which needs to be decompressed is usually greater than 100 DEG C, and the pressure is greater than 0.8 MPa.

[0035] In some examples, the liquid coolant can be desalted water which can absorb radioactive salt in the high temperature and high pressure fluid.

[0036] The liquid coolant can cool the high temperature and high pressure fluid by entering the high temperature and high pressure fluid, liquefy the high temperature steam, reduce the total volume of the high temperature and high pressure fluid, reduce the pressure of the high temperature and high pressure fluid, and achieve the purpose of decompression; the liquid coolant can also cool the high temperature and high pressure fluid by mixing with the liquid in the high temperature and high pressure fluid; and the liquid coolant can also increase the resistance of the high temperature and high pressure fluid flowing out of the pressure relief pipeline 8, reduce the flow rate of the high temperature and high pressure fluid, and achieve the purpose of decompression; in this process, part of the liquid coolant is vaporized to absorb heat, and the mixed liquid coolant can also be cooled.

[0037] The flow area of the outlet of the pressure relief pipeline 8 is large, so that the flow rate of the high-temperature and high-pressure fluid gradually decreases and the pressure gradually decreases during the process of the high-temperature and high-pressure fluid flowing from the inlet of the pressure relief pipeline 8 to the outlet of the pressure relief pipeline 8, thereby achieving pressure relief.

[0038] If there is gaseous material (gas or steam) remaining after the high-temperature and high-pressure fluid passes through the pressure relief pipeline 8 and the liquid coolant is relieved, the gaseous material is released into the gas space and further cooled, decompressed and slowed down in the gas space, and further relieved.

[0039] After the high-temperature and high-pressure fluid enters the inner cavity of the pressure relief pool body 1, it drives the liquid coolant and gas in the inner cavity of the pressure relief pool body 1 to warm up. At this time, the pressure relief pool exchanges heat through heat convection and heat conduction between the outer wall of the pressure relief pool body 1 and the external space, which is conducive to reducing the temperature of the gas and the liquid coolant in the inner cavity of the pressure relief pool body 1 to the temperature before warming up.

[0040] In addition, compared with the pressure relief water tank in the prior art, the strength of the pressure relief pool body 1 in the present embodiment is higher, so that the size of the pressure relief pool body 1 can be set larger, and the volume of the closed space formed by the inner cavity of the pressure relief pool body 1 is larger (for example, the volume of the closed space can be set to 1000m 3 Therefore, more liquid coolant and larger gas space can be provided, so that a larger capacity of high-temperature and high-pressure fluid can be received for pressure relief, so that the pressure relief pool can be used in a reactor plant with more discharge requirements. For example, the pressure relief pool can also meet the pressure relief requirements of the residual heat removal system in the reactor plant.

[0041] Thus, the pressure relief pool in the embodiment of the utility model can reduce the radiation harm to the maintenance personnel when they maintain the pressure relief pool. By arranging at least one pressure relief pipeline 8 in the pressure relief pool body 1 and making the flow area of the outlet of the pressure relief pipeline 8 greater than the flow area of the inlet of the pressure relief pipeline 8, the flow rate of the external high-temperature and high-pressure fluid after entering the pressure relief pipeline 8 through the inlet of the pressure relief pipeline 8 can be reduced, and the pressure can be gradually reduced, so that the purpose of pressure relief is achieved. By arranging the liquid coolant in the inner cavity of the pressure relief pool body 1 and making the outlet of the pressure relief pipeline 8 submerged below the liquid level of the liquid coolant, the resistance of the high-temperature and high-pressure fluid flowing out of the outlet of the pressure relief pipeline 8 can be increased, so that the flow rate of the high-temperature and high-pressure fluid is reduced, and the purpose of pressure relief is achieved. The liquid coolant can also cool the high-temperature and high-pressure fluid after the speed is reduced, so that the high-temperature steam in the high-temperature and high-pressure fluid is liquefied after being cooled, which is beneficial to reducing the total volume of the high-temperature and high-pressure fluid, so as to reduce the pressure of the high-temperature and high-pressure fluid and achieve the purpose of pressure relief. Finally, the gaseous substances remaining in the high-temperature and high-pressure fluid leak into the gas space to continue to relieve pressure. In summary, the pressure relief pool in the embodiment of the application can cool, depressurize and slow down the high-temperature and high-pressure fluid, so as to achieve the purpose of pressure relief. Compared with the pressure relief tank in the prior art, the strength of the pressure relief pool body 1 in the embodiment is higher, so that the size of the pressure relief pool body 1 can be set larger, and the volume of the sealed space formed by the inner cavity of the pressure relief pool body 1 is larger (for example, the volume of the sealed space can be set to 1000m 3 ), so that more liquid coolant and larger gas space can be arranged, and therefore a larger capacity of high-temperature and high-pressure fluid can be received for pressure relief, so that the pressure relief pool can be used in a reactor plant with more discharge requirements.

[0042] In some embodiments, as shown in Figure 2 , the pressure relief pipeline 8 has at least one bending portion for reducing the flow rate of the high-temperature and high-pressure fluid flowing through the bending portion.

[0043] For example, the number of bending portions can be one, two or three, etc.

[0044] For example, the bending angle of each bending portion can be greater than or equal to 90° and less than or equal to 140°, for example, it can be 90°, 120° or 140°.

[0045] The more the number of bending portions, the more obvious the effect of the pressure relief pipeline 8 on the speed reduction of the high-temperature and high-pressure fluid flowing through. The smaller the bending angle of the bending portion, the more obvious the effect of the bending portion on the speed reduction of the high-temperature and high-pressure fluid flowing through, but the impact of the high-temperature and high-pressure fluid on the bending portion is also stronger, so the strength requirement of the bending portion is also higher.

[0046] The number and the bending angle of the bending part can be designed according to the site requirement, so that the pressure relief pipeline 8 has a good speed reduction effect on the high-temperature and high-pressure fluid, and damage to the bending part of the pressure relief pipeline 8 caused by the high-temperature and high-pressure fluid is avoided.

[0047] In some embodiments, as shown in Figure 2 At least one pressure distribution pipe is arranged on the pressure relief pipeline 8, the pressure distribution pipe is communicated with the pressure relief pipeline 8 after being bent, and the outlet of the pressure distribution pipe is immersed below the liquid level of the liquid coolant, so as to distribute and relieve the high-temperature and high-pressure fluid in the pressure relief pipeline 8.

[0048] For example, the number of the pressure distribution pipe is two, and the two pressure distribution pipes are arranged on opposite sides of the pressure relief pipeline 8, so as to balance the reaction force of the high-temperature and high-pressure fluid entering the two pressure distribution pipes on the pressure relief pipeline 8.

[0049] For example, the pipe diameter of the pressure distribution pipe can be the same as that of the pressure relief pipeline 8, so as to reduce the manufacturing difficulty of the pressure distribution pipe.

[0050] For example, the material of the pressure distribution pipe can be the same as that of the pressure relief pipeline 8, such as stainless steel, low alloy steel and other corrosion-resistant and high-strength metal materials.

[0051] For example, the pressure distribution pipe and the pressure relief pipeline 8 can be connected together by welding, bolt connection and the like.

[0052] Through the above arrangement, the flow path of the high-temperature and high-pressure fluid entering the inlet of the pressure relief pipeline 8 is increased, and the high-temperature and high-pressure fluid can be distributed, so that the high-temperature and high-pressure fluid can be relieved.

[0053] In some embodiments, as shown in Figure 1 and Figure 2 A vertical vent hole 11 is arranged on the top of the pressure relief tank body 1, and the vent hole 11 is used to communicate the gas space with the outside air.

[0054] For example, the number of the vent hole 11 can be one or multiple.

[0055] As described above, after the high-temperature and high-pressure fluid enters the pressure relief tank, the liquid component in the high-temperature and high-pressure fluid and the liquid component formed after the steam condenses will be mixed with the liquid coolant, so that the total volume of the liquid component in the pressure relief tank is increased, the liquid level is raised, the volume of the gas space reserved above the liquid coolant is reduced, and the gas pressure is increased. The gas component in the high-temperature and high-pressure fluid will also be mixed with the gas in the gas space reserved above the liquid coolant, so as to further increase the total gas pressure of the gas in the gas space.

[0056] By setting the vent hole 11, part of the gas in the gas space can be discharged to the outside, the gas pressure in the gas space is reduced, the gas pressure balance between the gas space and the outside air is maintained, and the pressure relief tank can continuously relieve the high-temperature and high-pressure fluid entering the inside thereof.

[0057] In some embodiments, as shown in Figure 1 and Figure 2 , the pressure relief tank further comprises a high water level discharge pipe 3. The high water level discharge pipe 3 is horizontally arranged at the upper part of the pressure relief tank body 1 and communicates with the inner cavity of the pressure relief tank body 1 after penetrating through the side wall of the pressure relief tank body 1; the liquid coolant in the inner cavity higher than the high water level discharge pipe 3 is discharged to the outside of the pressure relief tank through the high water level discharge pipe 3.

[0058] Illustratively, the number of high water level discharge pipes 3 can be one or more.

[0059] As described above, after the high-temperature and high-pressure fluid enters the pressure relief tank, the total volume of the liquid component in the pressure relief tank increases, and the high water level discharge pipe 3 can discharge the excess liquid, thereby maintaining the gas space in the pressure relief tank and avoiding too much liquid from affecting the subsequent reception of high-temperature and high-pressure fluid by the pressure relief tank, so that the pressure relief tank can continuously relieve the high-temperature and high-pressure fluid entering the inside thereof.

[0060] In some embodiments, as shown in Figure 1 and Figure 2 , the pressure relief tank body 1 is provided with a manhole 10 communicating with the inner cavity at the top thereof, and a cover plate 7 is arranged at the position corresponding to the manhole 10 of the pressure relief tank body 1 and can be opened and closed. The pressure relief tank further comprises a vertical ladder 6 arranged in the inner cavity of the pressure relief tank body 1 and located below the manhole 10.

[0061] Illustratively, the cover plate 7 is hinged to the upper wall of the pressure relief tank body 1.

[0062] When the pressure relief tank is working, the cover plate 7 is closed to prevent people from falling. When maintenance or replacement of parts (such as the pressure relief pipeline 8) is needed, the cover plate 7 is opened. The maintenance personnel can enter the inside of the pressure relief tank along the vertical ladder 6 through the manhole 10 to perform maintenance and other work on the pressure relief tank.

[0063] In some embodiments, as shown in Figure 1 and Figure 2 , the bottom of the inner cavity of the pressure relief tank body 1 is provided with a pit 5. The pressure relief tank further comprises an emptying pipe 4 arranged transversely at the bottom of the pressure relief tank body 1 and communicating with the pit 5 after penetrating through the side wall of the pressure relief tank body 1, for emptying the liquid coolant in the inner cavity.

[0064] Illustratively, the number of emptying pipes 4 can be one or more.

[0065] When the pressure relief tank is maintained or replaced parts, the need to empty the pressure relief tank body 1 within the entire liquid. Pit 5 can be a pressure relief tank body 1 within other higher liquid collection to make the liquid faster through the emptying pipe 4 discharge.

[0066] In some embodiments, as shown in Figure 1 and Figure 2 The wall of the inner cavity of the pressure relief tank body 1 is provided with a corrosion structure 2. The thickness a of the corrosion structure 2 satisfies, 400mm≤a≤2000mm.

[0067] Exemplary, the material of the corrosion structure 2 can be stainless steel, lead and other corrosion resistant materials.

[0068] The thickness a of the corrosion structure 2 can be 400mm, 1000mm, 1500mm or 2000mm, etc.

[0069] The corrosion structure 2 can enhance the corrosion level of the wall of the inner cavity of the pressure tank body 1, and provide a certain pressure capacity for the pressure relief tank body 1.

[0070] In some embodiments, the volume C1 of the inner cavity satisfies, 0.1m 3 ≤C1≤1000m 3 ; the volume C2 of the gas space satisfies, 0.1m 3 <C2<1000m 3 , and C2

[0071] Exemplary, the volume C1 of the inner cavity can be 0.1m 3 , 10m 3 , 100m 3 , 200m 3 , 500m 3 , 800m 3 or 1000m 3 , etc. The volume C2 of the gas space can be 0.1m 3 , 10m 3 , 30m 3 , 100m 3 , 500m 3 , 800m 3 or 1000m 3 , etc.

[0072] The volume C1 of the inner cavity and the volume C2 of the gas space can be flexibly set, so that the pressure relief tank can be applied to the high temperature and high pressure fluid generated by various systems or equipment. The pressure relief tank improves the versatility of the pressure relief tank.

[0073] In some embodiments, the temperature of the liquid coolant is less than or equal to 50°C before the high-temperature and high-pressure fluid enters the pressure relief pool.

[0074] For example, the temperature of the liquid coolant can be 50°C, 49°C, 45°C, or the like.

[0075] The lower initial temperature of the liquid coolant can enable the liquid coolant to absorb more heat, thereby achieving a better cooling effect on the high-temperature and high-pressure fluid.

[0076] In some embodiments, the ratio of the flow area of the outlet of the pressure relief pipeline 8 to the flow area of the inlet of the pressure relief pipeline 8 is b, and 1.5≤b≤3.

[0077] The ratio b can be flexibly set according to the site conditions. For example, when the number of shunt pipes is large, the ratio b can be set to be small; when the number of shunt pipes is small, the ratio b can be set to be large.

[0078] For example, the ratio b can be 1.5, 2, 2.5, or 3, or the like.

[0079] For example, the flow area of the inlet of the pressure relief pipeline 8 is 0.1 m 2 The flow area of the outlet of the pressure relief pipeline 8 can be 0.15 m 2 , 0.2 m 2 , 0.25 m 2 , or 0.3 m 2 , or the like.

[0080] Through the above setting, the pressure relief pipeline 8 can have a suitable pressure relief effect on the high-temperature and high-pressure fluid, and the manufacturing difficulty of the pressure relief pipeline 8 can be reduced to a certain extent.

[0081] At present, the main pressure relief for the primary loop system in the reactor building is carried out through pressure relief equipment, which occupies a limited equipment space in the reactor building. Due to the characteristics of the reactor building, the equipment space in the reactor building is limited, but there are many discharge requirements, and the carrying volume of the downstream equipment needs to be guaranteed to discharge the primary loop, the residual discharge, the chemical containment, or other systems with discharge requirements. Therefore, the design of the existing pressure relief equipment of the reactor type can barely meet the discharge requirements of the reactor building system, and the existing pressure relief equipment is difficult to meet the use requirements in other models with special requirements.

[0082] The pressure relief pool provided by the utility model can realize full-range passive design in the typical three-loop pressurized water reactor nuclear island plant, thereby greatly simplifying the design of the nuclear power plant, thereby reducing the size of the reactor building and the operation and maintenance cost of the nuclear power plant, improving the operation and maintenance efficiency, quality, and overall economy of the enterprise.

[0083] Embodiment 2:

[0084] The utility model embodiment further provides a one loop pressure stabilization system, one loop pressure stabilization system is applied to the reactor building of nuclear power plant, is used for maintaining the stability of one loop system internal pressure. One loop pressure stabilization system includes pressure stabilizer and the pressure relief pool in embodiment 1. Pressure stabilizer is arranged on the main pipeline of one loop. The pressure relief pool is communicated with pressure stabilizer through safety valve, is used for receiving high temperature and high pressure fluid in pressure stabilizer when safety valve opens, to carry out pressure relief to high temperature and high pressure fluid.

[0085] Exemplarily, the pressure stabilizer is communicated with the main pipeline of the one loop, and is used to maintain the pressure stability in the one loop.

[0086] When the pressure in the pressure stabilizer is too large due to a fault of the one loop, the safety valve is opened, the high temperature and high pressure fluid in the pressure stabilizer flows into the pressure relief pool, the pressure relief pool receives and relieves the high temperature and high pressure fluid, and leakage of the high temperature and high pressure fluid to the outside can be avoided to cause harm or pollution.

[0087] Embodiment 3:

[0088] The utility model embodiment further provides a reactor building, the reactor building includes a containment, a one loop and the one loop pressure stabilization system in embodiment 2. The one loop is arranged in the containment, and the pressure of the high temperature and high pressure fluid in the main pipeline of the one loop is Q, 14MPa≤Q≤16MPa.

[0089] Exemplarily, the pressure Q of the high temperature and high pressure fluid in the main pipeline of the one loop can be 14MPa, 15MPa or 16MPa.

[0090] The pressure stabilizer of the one loop pressure stabilization system is arranged on the main pipeline of the one loop, therefore, the pressure inside the pressure stabilizer is usually close to the steam pressure in the main pipeline of the one loop.

[0091] The one loop pressure stabilization system can stabilize the one loop, and when the pressure in the one loop is too high, part of the high temperature and high pressure fluid in the main pipeline of the one loop is discharged from the pressure stabilizer to the pressure relief pool to relieve pressure, so as to protect the one loop and improve the safety of the reactor building.

[0092] In some embodiments, the pressure relief pool of the one loop pressure stabilization system is arranged at the bottom of the reactor building.

[0093] The pressure relief tank in the prior art is arranged in a shield room, which is a high radioactivity area, and low radioactivity pipes, air pipes and cables in the reactor building are difficult to pass through the shield room, which increases the difficulty of overall arrangement and planning design of the reactor building.

[0094] Through the above setting, the pressure relief water pool can reduce the influence on the pipeline cable in the reactor building, and the difficulty of overall arrangement and planning design of the reactor building is reduced.

[0095] It can be understood that the above embodiments are only exemplary embodiments for illustrating the principles of the present application, and the present application 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 application, and these modifications and improvements are also considered as the protection scope of the present application.

Claims

1. A pressure relief sump, characterized by, The pressure relief water tank body (1) is arranged in the reactor building, and an inner cavity of the pressure relief water tank body (1) forms a closed space; the inner cavity is filled with liquid coolant, and a gas space is reserved above the liquid coolant; and At least one pressure relief pipeline (8) is fixed in the pressure relief water tank body (1); an inlet of the pressure relief pipeline (8) is communicated with the outside through an upper wall of the pressure relief water tank body (1), and an outlet of the pressure relief pipeline (8) is immersed below a liquid level of the liquid coolant; a flow area of the outlet of the pressure relief pipeline (8) is greater than a flow area of the inlet of the pressure relief pipeline (8); The high-temperature and high-pressure fluid from the outside enters the inner cavity through the inlet of the pressure relief pipeline (8), is relieved in the pressure relief pipeline (8) and the liquid coolant, and is finally released into the gas space. The pressure relief pipeline (8) has at least one bending part for reducing the flow speed of the high-temperature and high-pressure fluid flowing through the bending part.

2. The pressure relief sump of claim 1, wherein, At least one pressure distribution pipeline is arranged on the pressure relief pipeline (8), the pressure distribution pipeline is communicated with the pressure relief pipeline (8) after being bent, the outlet of the pressure distribution pipeline is immersed below the liquid level of the liquid coolant, and the pressure distribution pipeline is used for distributing and relieving the high-temperature and high-pressure fluid in the pressure relief pipeline (8).

3. The pressure relief sump of claim 1, wherein, A vertical air vent (11) is arranged on the top of the pressure relief water tank body (1), and the air vent (11) is used for communicating the gas space with the outside air.

4. The pressure relief sump of any one of claims 1-3, wherein, Further comprising a high water level discharge pipe (3); 5. The pressure relief sump of any one of claims 1-3, wherein, The high water level discharge pipe (3) is horizontally arranged at the upper part of the pressure relief water tank body (1) and is communicated with the inner cavity of the pressure relief water tank body (1) after penetrating through the side wall of the pressure relief water tank body (1); the liquid coolant in the inner cavity, which is higher than the high water level discharge pipe (3), is discharged to the outside of the pressure relief water tank through the high water level discharge pipe (3). A manhole (10) is arranged on the top of the pressure relief water tank body (1) and is communicated with the inner cavity; a closable cover plate (7) is arranged on the pressure relief water tank body (1) and corresponds to the position of the manhole (10).

6. The pressure relief sump of any one of claims 1-3, wherein, The pressure relief water tank further comprises a vertical ladder (6), and the vertical ladder (6) is arranged in the inner cavity of the pressure relief water tank body (1) and is located below the manhole (10). A pit (5) is arranged at the bottom of the inner cavity of the pressure relief water tank body (1).

7. The pressure relief sump of any one of claims 1-3, wherein, The pressure relief water tank further comprises an emptying pipe (4); the emptying pipe (4) is transversely arranged at the bottom of the pressure relief water tank body (1) and is communicated with the pit (5) after penetrating through the side wall of the pressure relief water tank body (1), and is used for emptying the liquid coolant in the inner cavity. An anticorrosion structure (2) is arranged on the wall surface of the inner cavity of the pressure relief water tank body (1).

8. The pressure relief sump of any one of claims 1-3, wherein, The thickness a of the anticorrosion structure (2) satisfies 400mm≤a≤2000mm.

9. The pressure relief water tank according to any one of claims 1-3, wherein 10. The pressure relief water tank according to any one of claims 1-3, wherein The volume C1 of the inner cavity satisfies, 0.1 m 3 ≤ C1 ≤ 1000 m 3 The volume C2 of the gas space satisfies, 0.1 m 3 < C2 < 1000 m 3 , and C2 < C1. The liquid coolant is desalted water; and / or ​ The temperature of the liquid coolant is less than or equal to 50℃ before the high-temperature and high-pressure fluid enters the pressure relief tank; and / or, The ratio of the flow area of the outlet of the pressure relief pipeline (8) to the flow area of the inlet of the pressure relief pipeline (8) is b, and 1.5≤b≤3.

11. A primary loop pressurization system, comprising: The system comprises: A pressure stabilizer arranged on a main pipeline of a primary loop; And, The pressure relief tank of any one of claims 1-10, in communication with the pressure stabilizer through a safety valve, for receiving the high-temperature and high-pressure fluid in the pressure stabilizer when the safety valve is opened to relieve the pressure of the high-temperature and high-pressure fluid.

12. A reactor building, characterized in that The system comprises: A containment vessel; A primary loop arranged in the containment vessel, the pressure of the high-temperature and high-pressure fluid in a main pipeline of the primary loop being Q, and 14 MPa≤Q≤16 MPa; and The primary loop pressure stabilizing system of claim 11.

Images