Integrated seabed / underground reactor system
By placing the reactor pressure vessel under deep water, the outside of it is subjected to water pressure, reducing the pressure difference between inside and outside the pressure vessel, solving the problems of high-pressure leakage and radioactive material leakage, and achieving cost reduction and safety improvement.
Patent Information
- Application Number
- CN202510373140.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2025-06-17
AI Technical Summary
In the prior art, reactor pressure vessels are prone to micro cracks during manufacturing and long-term operation, resulting in high-pressure leakage or spraying, thereby leaking radioactive substances and causing production accidents.
An integrated subsea/underground small reactor system is designed. By placing the pressure vessel under deep water, the outside of it is subjected to water pressure. The control rod bundle of the nuclear reaction assembly is moved upward from the reactor core. The reactor core performs nuclear fission reaction to release heat, heats the water around the reactor core, so as to increase the pressure inside the pressure vessel, ensuring that the external water pressure is greater than or equal to the internal pressure, thereby reducing the pressure difference inside and outside the pressure vessel.
It reduces the manufacturing cost of pressure vessels, prevents high-pressure leakage and radioactive material leakage, reduces the radiation impact on the environment, and improves the safety and economics of the system.
Smart Images
Figure CN120164644A_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of nuclear reactors, and particularly relates to an integrated submarine / underground small reactor system. Background Art
[0002] One of the core components of a pressurized water reactor nuclear power plant is the reactor pressure vessel, which contains core nuclear fuel, control components, in-core structures, and reactor coolant, etc. inside. Common pressurized water reactor nuclear power plants mostly use water cooling. Since nuclear fuel generates high temperature during the reaction, the cooling water needs to work in the water phase at high temperature, and only by greatly increasing the working pressure of the cooling water can it be kept in the water phase. Therefore, the reactor pressure vessel needs to withstand high pressure, such as 7 - 15 MPa. On the one hand, this requires high manufacturing costs for the reactor pressure vessel. On the other hand, due to the large pressure difference inside and outside the reactor pressure vessel, when micro-cracks occur during the manufacturing or long-term operation of the reactor pressure vessel, there is a risk of high-pressure leakage or even jet release from the inside to the outside of the reactor pressure vessel, which may lead to the release of radioactive substances into the external environment and cause production accidents.
[0003] Currently, the solution in the prior art is to place the reactor pressure vessel and the loop in a larger containment vessel to collect the potentially leaked radioactive substances. However, the volume of this containment vessel is large, resulting in high construction costs, and the pressure inside the containment vessel may still be higher than the ambient pressure, still posing a risk of radioactive substance leakage to the external environment. In short, for a reactor pressure vessel with high internal pressure and containing harmful substances, the solution of using a costly containment vessel still has difficulty effectively preventing the natural tendency of leakage from the high-pressure area to the low-pressure area, and there is still a risk of radioactive substances leaking into the external environment. Summary of the Invention
[0004] In view of this, the present invention provides an integrated submarine / underground small reactor system to solve the deficiencies in the prior art. The present invention can reduce the manufacturing cost of the pressure vessel and reduce the impact of radioactive substances on the environment.
[0005] The technical solution of the present invention is: an integrated submarine / underground small reactor system, characterized in that it includes a pressure vessel and a nuclear reaction assembly disposed in the pressure vessel. Water is filled in the pressure vessel, and the pressure vessel is placed under deep water so that the outside of the pressure vessel is subjected to water pressure. The nuclear reaction assembly includes a reactor core fixedly arranged on the lower side inside the pressure vessel. The reactor core is immersed in water. Control rod bundles are vertically penetrated through the top of the pressure vessel, and the control rod bundles are slidably and sealedly connected to the pressure vessel along their length directions. The control rod bundles can be inserted downward or withdrawn upward from the reactor core to stop or start the nuclear fission reaction. When the reactor core starts the nuclear fission reaction and releases heat, the water around the reactor core can be heated, the pressure inside the pressure vessel increases, and the sufficient water depth makes the external water pressure received by the pressure vessel greater than or equal to its internal pressure, thereby reducing the pressure difference inside and outside the pressure vessel.
[0006] Preferably, it further includes: a steam generator, a steam turbine, and a rotor generator. The steam generator is fixedly arranged inside the pressure vessel and is located directly above the reactor core. The steam generator is immersed in water. The heated water around the reactor core transfers heat to the water in the steam generator to vaporize the water in the steam generator. The steam generator is connected to the steam turbine through a water / steam pipeline, and the steam turbine is connected to the rotor generator.
[0007] Preferably, a watertight isolation cylinder is vertically sleeved outside the steam generator. The watertight isolation cylinder is fixedly connected to the pressure vessel or the reactor core. The heated water around the reactor core flows upward through the watertight isolation cylinder and then flows downward outside the watertight isolation cylinder and returns to the periphery of the reactor core.
[0008] Preferably, the water / steam pipeline includes: a steam pipeline and a cooling water pipeline. One end of the steam pipeline is communicated with the upper part of the steam generator, and the other end passes through the pressure vessel and is communicated with the steam inlet of the steam turbine. One end of the cooling water pipeline is communicated with the lower part of the steam generator, and the other end passes through the pressure vessel and is communicated with the condenser of the steam turbine.
[0009] Preferably, heat insulation coatings and anti-corrosion coatings are respectively arranged outside the pressure vessel, the steam pipeline, and the cooling water pipeline.
[0010] Preferably, the pressure vessel is placed at the bottom of a submarine or a vertical well drilled on the ground. Water is filled in the vertical well drilled on the ground, and the steam turbine and the rotor generator are arranged on an offshore platform or on the ground.
[0011] Preferably, a watertight material is poured on the inner wall of the vertical well drilled on the ground.
[0012] Preferably, an isolation well cover is arranged at the mouth of the vertical well drilled on the ground to seal the vertical well drilled on the ground. There is air between the isolation well cover and the water surface in the vertical well drilled on the ground. A water-phase and gas-phase substance composition analysis and detection probe is fixedly arranged on the lower side of the isolation well cover.
[0013] Compared with the prior art, an integrated submarine / underground small reactor system provided by the present invention places the pressure vessel underwater, such that the outside of the pressure vessel is subject to water pressure. The control rod bundles of the nuclear reaction assembly are withdrawn upward from the reactor core, and the reactor core undergoes nuclear fission reactions to release heat, heating the water around the reactor core, increasing the pressure inside the pressure vessel. Sufficient water depth makes the external water pressure on the pressure vessel greater than or equal to its internal pressure, thereby reducing the pressure difference between the inside and outside of the pressure vessel. This can not only reduce the manufacturing cost of the pressure vessel, but also prevent potential high-pressure leakage or even jetting from the inside to the outside of the pressure vessel. At the same time, since the pressure vessel is underwater, it can reduce the impact of radioactive substances on the environment. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 is a schematic diagram of the small reactor system of the present invention; Figure 2 is a schematic diagram of the internal cooling water circulation of the small reactor system of the present invention; Figure 3 is a schematic diagram of the internal structure of the small reactor system of the present invention; Figure 4 is a schematic diagram of multiple pressure vessels of the small reactor system of the present invention stacked vertically; Figure 5 is a schematic diagram of multiple pressure vessels of the small reactor system of the present invention arranged horizontally. DETAILED DESCRIPTION OF THE INVENTION
[0016] The present invention provides an integrated submarine / underground small reactor system. The following combines Figures 1 to 5 the schematic diagram of the structure to describe the present invention.
[0017] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the technical solutions of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.
[0018] At present, the solution in the prior art is to place the reactor pressure vessel and the loop in a larger containment vessel to collect the potentially leaked radioactive substances. However, the large volume of the containment vessel results in high construction costs, and the pressure inside the containment vessel may still be higher than the ambient pressure, still posing a risk of leakage of radioactive substances to the external environment. In short, for a reactor pressure vessel with high internal pressure and containing harmful substances, the solution of using a costly containment vessel still has difficulty effectively preventing the natural tendency of leakage from the high-pressure area to the low-pressure area, and there is still a risk of leakage of radioactive substances into the external environment.
[0019] Based on the above problems, an integrated underwater / underground small reactor system provided by an embodiment of the present invention places the pressure vessel underwater, so that the outside of the pressure vessel is subjected to water pressure. The control rod bundle of the nuclear reaction assembly moves upward from the reactor core. The reactor core reacts to release heat, heating the water around the reactor core, increasing the pressure inside the pressure vessel, and making the water pressure received by the pressure vessel greater than or equal to its internal pressure, thereby reducing the pressure difference inside and outside the pressure vessel. This can not only reduce the manufacturing cost of the pressure vessel, but also prevent potential hazards such as high-pressure leakage or even jetting from the inside to the outside of the pressure vessel. At the same time, since the pressure vessel is underwater, it can reduce the impact of radioactive substances on the environment. The small reactor system of the present invention has low cost, high safety, and strong practicability, and is worthy of promotion.
[0020] Refer to Figure 1 and Figure 3 , Figure 1 is a schematic diagram of the small reactor system of this embodiment, Figure 3 is a schematic diagram of the internal structure of the small reactor system of this embodiment. As Figure 1 、 3 shown, an integrated underwater / underground small reactor system, characterized in that it includes a pressure vessel 1 and a nuclear reaction assembly arranged in the pressure vessel 1. Water is filled in the pressure vessel 1, and the pressure vessel 1 is placed underwater so that the outside of the pressure vessel 1 is subjected to water pressure. The nuclear reaction assembly includes a reactor core 2 fixedly arranged at the lower side inside the pressure vessel 1. The reactor core 2 is immersed in water. The control rod bundle 3 vertically penetrates through the top of the pressure vessel 1, and the control rod bundle 3 is slidably and sealedly connected to the pressure vessel 1 along its length direction. The control rod bundle 3 is inserted downward into the reactor core 2. The reactor core 2 reacts to release heat to heat the water around the reactor core 2, increasing the pressure inside the pressure vessel 1, and making the water pressure received by the pressure vessel 1 greater than or equal to its internal pressure, thereby reducing the pressure difference inside and outside the pressure vessel 1.
[0021] In the integrated subsea / underground small reactor system of this embodiment, when the operating pressure of the pressure vessel 1 is 157 atmospheres and the water pressure outside the pressure vessel 1 is 160 atmospheres, the pressure difference inside and outside the pressure vessel 1 is small. Due to the very small pressure difference inside and outside the pressure vessel 1, the pressure vessel 1 only needs to withstand a relatively low pressure, such as 10 bar, instead of 150 bar, which greatly reduces the manufacturing requirements and cost of the pressure vessel 1.
[0022] As a further optimization scheme, this embodiment also includes: a steam generator 4, a steam turbine 6, and a rotor generator. The steam generator 4 is fixedly installed inside the pressure vessel 1 and is located directly above the reactor core 2. The steam generator 4 is immersed in water. The heated water around the reactor core 2 transfers heat to the water in the steam generator 4 to vaporize the water in the steam generator 4. The steam generator 4 is connected to the steam turbine 6 through a water / steam pipeline 16, and the steam turbine 6 is connected to the rotor generator.
[0023] In this embodiment, through the combined use of the steam generator 4, the steam turbine 6, and the rotor generator, the reactor core 2 is located at the lower side inside the pressure vessel 1. A large amount of water in the pressure vessel 1 is at 157 bar. The control rod bundle of the nuclear reaction assembly is withdrawn upward from the reactor core. The reactor core undergoes a reaction to release heat. The temperature of the water around the reactor core 2 can reach 330 degrees Celsius. The hot water exchanges heat with the water in the steam generator 4 located directly above the reactor core 2, thereby vaporizing the water in the steam generator 4. The pressure inside the steam generator 4 is 70 - 80 bar. The steam in the steam generator 4 is input into the steam turbine 6 through the water / steam pipeline 16. The steam turbine 6 and the rotor generator are used in combination to generate electricity. The hot water in the pressure vessel 1 exchanges heat with the water in the steam generator 4 and then cools down, and then absorbs the heat released by the reactor core 2 again, thus realizing the cyclic power generation of the small reactor system.
[0024] Refer to Figure 2 , Figure 2 is the schematic diagram of the internal cooling water circulation of the small reactor system of this embodiment. As shown in Figure 2 As a further optimization scheme, a watertight isolation cylinder 41 is vertically sleeved outside the steam generator 4 in this embodiment. The watertight isolation cylinder 41 is fixedly connected to the pressure vessel 1 or the reactor core 2. The heated water around the reactor core 2 flows upward through the watertight isolation cylinder 41 and then flows downward on the outside of the watertight isolation cylinder 41 and returns to the periphery of the reactor core 2.
[0025] In this embodiment, a watertight isolation cylinder 41 is vertically sleeved outside the steam generator 4. The watertight isolation cylinder 41 is used to construct a water circulation path. The reactor core undergoes a reaction to release heat. The temperature of the water around the reactor core 2 can reach 330 degrees. The hot water flows upward through the watertight isolation cylinder 41, thereby exchanging heat with the steam generator 4 located in the watertight isolation cylinder 41. After the hot water in the pressure vessel 1 exchanges heat with the water in the steam generator 4, the temperature drops, and then it flows downward outside the watertight isolation cylinder 41 back to the periphery of the reactor core 2, and absorbs the heat released by the reactor core 2 again, thus forming a complete natural circulation loop of the core to achieve the circulating power generation of the small reactor system.
[0026] In this embodiment, the watertight isolation cylinder 41 is used to construct a water circulation path, so that the hot water that has absorbed the heat released by the reactor core 2 is separated from the water after heat exchange. The water in the pressure vessel 1 flows vertically upward as the flow path of the core hot water, and the water in the pressure vessel 1 flows vertically downward as the flow path of the core cooling water.
[0027] As a further optimization scheme, in this embodiment, the water / steam pipeline 16 includes: a steam pipeline 61 and a cooling water pipeline 62. One end of the steam pipeline 61 is connected to the upper part of the steam generator 4, and the other end passes through the pressure vessel 1 and is connected to the steam inlet of the steam turbine 6. One end of the cooling water pipeline 62 is connected to the lower part of the steam generator 4, and the other end passes through the pressure vessel 1 and is connected to the condenser of the steam turbine 6.
[0028] In this embodiment, the water in the steam generator 4 is heated and vaporized by the rising water flow around the reactor core 2 to form steam. The steam enters the steam turbine through the steam pipeline 61 to drive the rotor generator to generate electricity. The steam waste gas enters the condenser of the steam turbine 6 and then enters the bottom of the steam generator 4 again through the cooling water pipeline 62.
[0029] As a further optimization scheme, in this embodiment, heat insulation layers and anti-corrosion layers are respectively arranged outside the pressure vessel 1, the steam pipeline 61 and the cooling water pipeline 62.
[0030] In this embodiment, heat insulation layers and outer anti-corrosion layers are arranged outside the pressure vessel 1, the steam pipeline 61 and the cooling water pipeline 62. The heat insulation layer uses vacuum multi-layer insulation materials, which can reduce the thermal conductivity to the order of 10-5W / m-K. Then the overall heat loss of all pipelines and pressure vessels in contact with the environment can be controlled at about 5kW. For a 100MW-class reactor, its heat loss is less than one ten-thousandth.
[0031] This embodiment also includes a pressurizer 7. The pressurizer 7 is fixedly arranged inside the pressure vessel 1 and is located directly above the steam generator 4.
[0032] In this embodiment, through the pressurizer 7, the pressurizer 7 controls the internal water level by means of electric heating or spraying water, so as to regulate the pressure inside the pressure vessel 1.
[0033] In this embodiment, the function of the pressurizer 7 is to regulate the pressure inside the pressure vessel 1. The method is that the inside of the pressurizer 7 is connected to the pressure vessel 1 to be isobaric. When it is necessary to increase the pressure of the pressure vessel 1, the steam amount inside the pressurizer 7 is increased by electric heating, thereby increasing the pressure inside the pressurizer 7 (the upper gas space 71 of the pressurizer), and thus increasing the pressure inside the pressure vessel 1. When it is necessary to reduce the pressure, cold water is sprayed inside the pressurizer 7, and the steam amount inside the pressurizer 7 is reduced by condensation, thereby reducing the pressure inside the pressurizer 7 (the lower liquid space 72 of the pressurizer), and thus reducing the pressure inside the pressure vessel 1.
[0034] In this embodiment, signal, power and control cables 15 between the small reactor and the platform are also arranged at the top of the pressure vessel 1. The signal, power and control cables 15 between the small reactor and the platform are connected to the sea surface / ground platform to implement signal transmission and power transmission for controlling the pressurizer 7 and the control rod bundle 3.
[0035] As a further optimization scheme, in this embodiment, the pressure vessel 1 is placed at the bottom of a vertical drilling in the seabed or on the ground. Water is filled in the vertical drilling on the ground. The steam turbine 6 and the rotor generator are arranged on the offshore platform or the ground 11, and a crane 12 is also provided on the offshore platform or the ground 11.
[0036] Refer to Figure 1 Figure 1 This is a schematic diagram of the small reactor system in this embodiment. As Figure 1 shown, the offshore platform is arranged on the sea level 13 by using the seabed platform support 17, and the pressure vessel 1 is buried in the seabed 18.
[0037] In this embodiment, the pressure vessel 1 is buried in the seabed of the deep sea area. A nuclear reaction assembly is placed in the pressure vessel 1. The steam generator 4, the steam turbine 6 and the rotor generator cooperate to generate electricity through the water / steam pipeline 16, which minimizes the impact of radioactivity on the environment.
[0038] The small reactor system in this embodiment uses the same operating pressure as the current pressurized water reactor. The pressure vessel 1 is buried in the seabed of the deep sea area. While using the water pressure to reduce the pressure difference between the inside and outside of the pressure vessel 1, the steam turbine 6 and the rotor generator are arranged on the offshore platform or the ground. By adopting the mature deep-water offshore operation platform technology, the manufacturing difficulty and cost of manufacturing the pressure vessel can be minimized to the greatest extent. The generated electricity can be used for the platform itself or sent to the land through submarine cables.
[0039] Similarly, when the small reactor system is set up on land, a vertical well is drilled 1,600 meters deep into the ground. The pressure vessel 1 is placed at the bottom of the vertical well, and then water is poured into the vertical well, so that the outside of the pressure vessel 1 is under water pressure. The water pressure on the pressure vessel 1 is greater than or equal to the internal pressure, thereby reducing the pressure difference between the inside and outside of the pressure vessel 1, and can greatly reduce the manufacturing difficulty and cost of manufacturing the pressure vessel.
[0040] In this embodiment, by placing the pressure vessel 1 at the bottom of the vertical well, the pressure vessel 1 is located in the rock layer close to the underground geological structure, so that the influence of surface climate, such as seasonal wind, rain, snow, ice, temperature, etc., on the pressure vessel 1 can be basically eliminated, greatly simplifying the territorial project characteristics of the small reactor system, improving the standardization degree of the nuclear facility site, accelerating the review speed of the regulatory authority, and ultimately reducing the construction cost of the small reactor.
[0041] As a further optimization scheme, in this embodiment, a watertight material is poured on the inner wall of the vertical well.
[0042] In this embodiment, after the vertical well is drilled, a watertight material needs to be poured on the inner wall of the vertical well to prevent the water poured into the vertical well from leaking, so that the water pressure on the outside of the pressure vessel 1 remains stable.
[0043] In this embodiment, first, a watertight material and a waterproof coating are laid on the inner wall of the vertical well. Then, after the pressure vessel 1 is lowered to the bottom of the vertical well, water is gradually poured into the vertical well. As the water level in the vertical well rises, water and gas are injected into the pressure vessel 1 through the water injection and gas injection pipeline 14 between the small reactor pressure vessel and the platform to gradually increase the pressure, so as to control the pressure difference between the inside and outside of the pressure vessel in real time, until the internal pressure of the pressure vessel 1 is increased to the operating pressure of about 150 bar, and then the control rod is gradually lifted to start the reactor to generate heat.
[0044] As a further optimization scheme, in this embodiment, an isolation manhole cover is provided at the mouth of the vertical well to seal the vertical well. There is air between the isolation manhole cover and the water surface in the vertical well, and a water-phase and gas-phase substance composition analysis and detection probe is fixedly installed on the lower side of the isolation manhole cover.
[0045] In this embodiment, the vertical well can be sealed according to the situation by using the isolation manhole cover, and the radioactive substances can be detected by using the water-phase and gas-phase substance composition analysis and detection probe, so as to purify the air / water radiation in the vertical well, such as: using a pumping / ventilation circuit for circulating purification, etc. The water level in the vertical well is generally adjusted by external water injection.
[0046] In this embodiment, there is an air layer between the water surface and the isolation well cover in the vertical drilling on the ground, so that there is a certain distance between the water surface and the ground, avoiding the direct entry of radioactive substances into the ground plane and further into the ground ecological circle, and preventing harm.
[0047] Refer to Figure 4 , Figure 4 which is a schematic diagram of multiple pressure vessels of the small reactor system in this embodiment stacked vertically. As Figure 4 shown, multiple pressure vessels 1 can be stacked vertically in the same duct, doubling the total reactor power in one duct, and can be increased according to actual needs, with modular stacking in the later stage, without much construction reservation.
[0048] Refer to Figure 5 , Figure 5 which is a schematic diagram of multiple pressure vessels of the small reactor system in this embodiment arranged horizontally. As Figure 5 shown, multiple holes are drilled in parallel below 1600 m of sea level to place multiple pressure vessels 1 respectively. Such an arrangement can extract different pressure vessels 1 respectively, without the need for the arrangement in Figure 4 . When lifting the lowermost pressure vessel, all pressure vessels need to be lifted out. When each pressure vessel is lifted in, it is introduced using different wall-adjacent tracks, and each track extends into a different hole.
[0049] The above-disclosed are only the preferred specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto, and any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.
Claims
1. An integrated seabed / underground small reactor system, characterized in that: include: A pressure vessel (1) and a nuclear reaction component arranged in the pressure vessel (1), wherein the pressure vessel (1) is filled with water and the pressure vessel (1) is placed under deep water so that the outer side of the pressure vessel (1) is subjected to water pressure, and the nuclear reaction component comprises: A reactor core (2) is fixedly arranged on the lower side of the interior of the pressure vessel (1), and the reactor core (2) is immersed in deep water; A control rod bundle (3) is vertically inserted into the top of the pressure vessel (1). The control rod bundle (3) is slidably and sealedly connected to the pressure vessel (1) along its length direction. The control rod bundle (3) can be inserted into or withdrawn from the reactor core (2) to stop or start the nuclear fission reaction. The reactor core (2) releases heat during the nuclear fission reaction to heat the water around the reactor core (2). The pressure inside the pressure vessel (1) increases to reach the designed operating pressure, and the water depth is sufficient to make the external water pressure of the pressure vessel (1) greater than or equal to the internal pressure.
2. The integrated seabed / underground small reactor system according to claim 1, characterized in that: Also includes: A steam generator (4), a steam turbine (6) and a rotor generator, wherein the steam generator (4) is fixedly arranged inside the pressure vessel (1) and located directly above the reactor core (2), the steam generator (4) is immersed in water, the heated water around the reactor core (2) transfers heat to the water in the steam generator (4), so that the water in the steam generator (4) is vaporized, the steam generator (4) is connected to the steam turbine (6) through a water / steam pipe (16), and the steam turbine (6) is connected to the rotor generator.
3. The integrated seabed / underground small reactor system according to claim 2 is characterized in that: A watertight isolation tube (41) is vertically sleeved on the outside of the steam generator (4), and the watertight isolation tube (41) is fixedly connected to the pressure vessel (1) or the reactor core (2). The heated water around the reactor core (2) flows upward through the watertight isolation tube (41), and then flows downward from the outside of the watertight isolation tube (41) back to the reactor core (2).
4. The integrated seabed / underground small reactor system according to claim 2, characterized in that: The water / steam pipeline (16) comprises: a steam pipeline (61) and a cooling water pipeline (62); one end of the steam pipeline (61) is connected to the upper part of the steam generator (4), and the other end passes through the pressure vessel (1) to be connected to the steam inlet of the steam turbine (6); one end of the cooling water pipeline (62) is connected to the lower part of the steam generator (4), and the other end passes through the pressure vessel (1) to be connected to the condenser of the steam turbine (6).
5. The integrated seabed / underground small reactor system according to claim 4, characterized in that: The outer sides of the pressure vessel (1), the steam pipe (61) and the cooling water pipe (62) are respectively provided with a heat insulation layer and an anti-corrosion layer.
6. The integrated seabed / underground small reactor system according to claim 2, characterized in that: The pressure vessel (1) is placed on the seabed or at the bottom of a vertical well on the ground, the vertical well on the ground is filled with water, and the steam turbine (6) and the rotor generator are arranged on an offshore platform or on the ground.
7. The integrated seabed / underground small reactor system according to claim 6, characterized in that: Watertight material is poured on the inner wall of the ground vertical drilling well.
8. The integrated seabed / underground small reactor system according to claim 6, characterized in that: An isolation well cover is provided at the mouth of the ground vertical drilling well to seal the ground vertical drilling well. There is air between the isolation well cover and the water surface in the ground vertical drilling well. A water phase and gas phase material composition analysis and detection probe is fixed on the lower side of the isolation well cover.