CN117809867A - Reactor with a reactor body - Google Patents

Abstract

Embodiments of the present disclosure relate to the field of nuclear reactor technology, and in particular, to a reactor. The reactor comprises a pressure vessel and a reactor core assembly, wherein the pressure vessel is used for containing coolant, and the side wall of the pressure vessel is provided with a plurality of water outlet channels and a plurality of water return channels; the reactor core assembly is arranged in the pressure vessel, a plurality of coolant channels are formed in the reactor core assembly, a hanging part is formed on the side wall of the pressure vessel, and a hanging matching part is formed on the top end of the reactor core assembly, so that the reactor core assembly is hung on the pressure vessel through the matching of the hanging matching part and the hanging part; the suspension part is positioned below the water outlet channel and above the water return channel, and the coolant entering the pressure vessel through the water return channel flows downwards to the bottom of the reactor core assembly, flows upwards to the upper side of the reactor core assembly along the coolant flow channel inside the reactor core assembly and then enters the water outlet channel. The reactor provided by the embodiment of the application, the reactor core assembly is directly hung on the side wall of the pressure vessel, so that the pressure vessel can be miniaturized.

Description

Reactor with a reactor body

Technical Field

Embodiments of the present disclosure relate to the field of nuclear reactor technology, and in particular, to a reactor.

Background

The statements herein merely provide background information related to the present application and may not necessarily constitute prior art. The miniature sodium-cooled miniature power supply has the characteristics of no material replacement, high intrinsic safety and microminiaturization in the whole life period, and in order to meet the requirements, the design of a reactor container and an inner member needs to be compact, simplified and long in service life, the reactor container and the inner member should have good stress states, and the material performance, the coolant compatibility and the technological performance are good, and the modularized structure can realize integral transportation.

Disclosure of Invention

The following presents a simplified summary of the application in order to provide a basic understanding of some aspects of the application. It should be understood that this summary is not an exhaustive overview of the application. It is not intended to identify key or critical elements of the application or to delineate the scope of the application. Its purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is discussed later.

Embodiments of the present application provide a reactor that includes a pressure vessel and a core assembly. The pressure container is used for containing coolant, the side wall of the pressure container is provided with a plurality of water outlet channels and a plurality of water return channels, the water outlet channels are used for leading out the coolant in the pressure container from the pressure container for cooling, and the water return channels are used for returning the cooled coolant into the pressure container; the reactor core assembly is arranged in the pressure vessel, a plurality of coolant channels are formed in the reactor core assembly, a hanging part is formed on the side wall of the pressure vessel, and a hanging matching part is formed on the top end of the reactor core assembly, so that the reactor core assembly is hung on the pressure vessel through the matching of the hanging matching part and the hanging part; the suspension part is positioned below the water outlet channel and above the water return channel, and the coolant entering the pressure vessel through the water return channel flows downwards to the bottom of the reactor core assembly, flows upwards to the upper side of the reactor core assembly along the coolant flow channel inside the reactor core assembly and then enters the water outlet channel.

The reactor that this embodiment of application provided is small-size heap, and heat exchanger and pump all set up outside pressure vessel, and the coolant in the pressure vessel need flow outside the pressure vessel and heat exchanger carries out heat transfer, directly hangs reactor core subassembly on pressure vessel's lateral wall for pressure vessel can realize miniaturization.

Drawings

To further clarify the above and other advantages and features of the present application, a more particular description of the invention will be rendered by reference to the appended drawings. The accompanying drawings are incorporated in and form a part of this specification, along with the detailed description that follows. Elements having the same function and structure are denoted by the same reference numerals. It is appreciated that these drawings depict only typical examples of the application and are not therefore to be considered limiting of its scope.

FIG. 1 shows a schematic cross-sectional view of a reactor according to one embodiment of the present application;

FIG. 2 shows an enlarged view of a portion of a reactor;

FIG. 3 shows a top view of the reactor shown in FIG. 1;

FIG. 4 shows a cross-sectional view of the reactor of FIG. 1 taken along the direction A-A;

FIG. 5 illustrates a cross-sectional schematic view of a support vessel according to one embodiment of the present application;

FIG. 6 shows a top view of the support vessel of FIG. 5;

fig. 7 shows a cross-sectional view of the support container of fig. 5 along the direction B-B.

It should be noted that the drawings are not necessarily to scale, but are merely shown in a schematic manner that does not affect the reader's understanding.

Reference numerals illustrate:

10. a pressure vessel; 11. a pressure vessel body; 111. a main container; 1111. a hanging part; 1112. a stop block; 1113. a mounting block; 112. a protective container; 113. a top connecting ring; 1131. a step surface; 12. a top cover; 121. an outer cover; 1211. hoisting the piece; 122. an inner cover body; 13. a limiting piece; 14. a shielding layer; 15. a control rod tube seat; 16. a water outlet channel; 161. a thermal displacement difference compensation piece of the water outlet channel; 17. a water return channel; 171. a return water channel thermal displacement difference compensation piece; 18. a sodium charging pipeline; 20. a core assembly; 21. a fuel assembly; 211. a head; 212. a pin; 22. a core shroud; 221. a hanging fitting portion; 23. an upper connecting plate; 30. a box structure; 31. a top plate; 32. a bottom plate; 33. a circumferential side plate; 40. a support container; 41. a radial stop; 42. a heat preservation layer; 43. a first ventilation pipe; 44. a second ventilation pipe; 45. an opening; 46. a step surface; 47. a cover body; 471. a yielding channel; 48. a bottom plate; 481. and a flange.

Detailed Description

Exemplary embodiments of the present application will be described hereinafter with reference to the accompanying drawings. In the interest of clarity and conciseness, not all features of an actual implementation are described in this specification. It will of course be appreciated that in the development of any such actual embodiment, numerous implementation-specific decisions must be made in order to achieve the developer's specific goals, such as compliance with system-and business-related constraints, and that these constraints will vary from one implementation to another. Moreover, it will be appreciated that such a development effort might be complex and time-consuming, but would nevertheless be a routine undertaking for those of ordinary skill in the art having the benefit of this disclosure.

It should be noted here that, in order to avoid obscuring the present application due to unnecessary details, only the device structures and/or processing steps closely related to the solution according to the present application are shown in the drawings, while other details not greatly related to the present application are omitted.

The following disclosure provides many different embodiments or examples for implementing the present application. In order to simplify the disclosure of the present application, specific example components and methods are described below. Of course, they are merely examples and are not intended to limit the present application. In the description of the embodiments of the present application, the meaning of "plurality" is at least two, for example, two, three, etc., unless explicitly defined otherwise.

The miniature sodium-cooled miniature power supply has the characteristics of no material replacement, high intrinsic safety and microminiaturization in the whole life period, and in order to meet the requirements, the design of a reactor container and an inner member needs to be compact, simplified and long in service life, the reactor container and the inner member should have good stress states, and the material performance, the coolant compatibility and the technological performance are good, and the modularized structure can realize integral transportation.

In view of the above requirements, embodiments of the present application provide a reactor, as shown in fig. 1, fig. 1 shows a schematic structural view of a pressure vessel according to one embodiment of the present application. The reactor includes a pressure vessel 10 and a core assembly 20. The pressure vessel 10 is used for containing coolant, the side wall of the pressure vessel 10 is provided with a plurality of water outlet channels 16 and a plurality of water return channels 17, the water outlet channels 16 are used for leading out the coolant in the pressure vessel 10 from the pressure vessel 10 for cooling, and the water return channels 17 are used for returning the cooled coolant into the pressure vessel 10; the core assembly 20 is disposed in the pressure vessel 10, and a plurality of coolant channels are formed inside the core assembly 20, wherein a sidewall of the pressure vessel 10 forms a hanging portion 1111, and a top end of the core assembly 20 forms a hanging engagement portion 221, so that the core assembly 20 is hung from the pressure vessel 10 by engagement of the hanging engagement portion 221 and the hanging portion 1111; the hanging portion 1111 is located below the water outlet channel 16 and above the water return channel 17, and the coolant entering the pressure vessel 10 via the water return channel 17 flows down to the bottom of the core assembly 20, flows up to the upper side of the core assembly 20 along the coolant flow channel inside the core assembly 20, and then enters the water outlet channel 16.

The reactor that this application provided is small-size heap, and heat exchanger and pump all set up in pressure vessel 10 outside, and the coolant in the pressure vessel 10 need flow to the pressure vessel 10 outside and heat exchanger carries out heat transfer, and reactor core subassembly 20 directly hangs on pressure vessel 10's lateral wall for pressure vessel 10 can realize miniaturization.

In the embodiment of the application, the reactor core assembly 20 and the pressure vessel 10 are directly faced, no other shielding component exists between the reactor core assembly and the pressure vessel, the structure is compact, and the design is simple.

The suspension 1111 can ensure that the core assembly 20 is supported and positioned at a predetermined position, and serves to fix and support the core assembly 20.

In some embodiments, the suspension 1111 may be an annular protrusion extending radially toward the core assembly 20 at a sidewall of the pressure vessel 10; the suspension mating portion 221 may be an annular flange protruding radially outward from the top end of the core assembly 20, the annular flange hanging on the annular protrusion.

In such embodiments, the annular protrusion and annular flange may cooperate to hang the core assembly 20 on the sidewall of the pressure vessel 10.

The suspension 1111 and the core assembly 20 together divide the interior of the pressure vessel 10 into an upper region and a lower region, the coolant in the upper region flows out of the pressure vessel 10 via the water outlet channel 16, enters the lower region of the pressure vessel 10 via the water return channel 17 after external cooling, flows down along the core assembly to the bottom of the core assembly, enters the core assembly 20, and then enters the upper region after cooling the fuel assembly from the bottom up in the core assembly 20. It can be seen that the present embodiment of the present application also facilitates the natural circulation inside the pressure vessel 10 by providing the suspension sections 1111 to suspend the core assembly 20 inside the pressure vessel 10.

In some embodiments, the bottom of the core assembly 20 may be free-standing, i.e., no structure is provided to support the bottom of the core assembly 20. The sidewall of the pressure vessel 10 facing the bottom of the core assembly 20 may extend a plurality of stoppers 1112 radially toward the bottom of the core assembly 20, the plurality of stoppers 1112 being spaced apart along the circumference of the pressure vessel 10, the plurality of stoppers 1112 being in clearance fit with the bottom of the core assembly 20 for preventing the bottom of the core assembly 20 from moving radially. The spacing between adjacent stops 1112 forms a channel for coolant to flow from top to bottom. The plurality of stoppers 1112 may be arranged at equal intervals to facilitate the coolant to flow downward uniformly.

The water outlet channel 16 and the water return channel 17 can be adjacently arranged, so that gas entrainment can be avoided.

As shown in fig. 1 and 2, fig. 2 shows a partial enlarged view of the reactor shown in fig. 1, and in some embodiments, the pressure vessel 10 may include a pressure vessel body 11 having an upper opening and a top cover 12 for closing the opening of the pressure vessel body 11, wherein the pressure vessel body 11 includes a main vessel 111 located at a radially inner side, a protection vessel 112 located at a radially outer side of the main vessel 111, and a top connection ring 113 connected to upper ends of the main vessel 111 and the protection vessel 112.

The hanging portion 1111 may be a flange welded to the main container 111, or the hanging portion 1111 may be integrally formed with the main container 111.

The protection container 112 is provided with a plurality of limiting members 13 arranged at intervals along the circumferential direction, the limiting members 13 are in clearance fit with the main container 111 and are used for preventing the main container 111 from moving along the radial direction, and each limiting member 13 corresponds to the position of one stop block 1112.

The stopper 13 may be welded to the protection vessel 112 to provide radial support to the main vessel 111 to prevent the stopper 1112 from being forced to deform the main vessel 111 when the bottom of the core assembly 20 is moved in the radial direction.

In some embodiments, as shown in fig. 2 and 4, when the coolant is liquid sodium, a sodium charge line 18 may also be provided in the pressure vessel 10 to introduce liquid sodium from a sodium source into the pressure vessel 10. The top connecting ring 113 may be provided with a channel through which the upper end of the sodium charge line 18 extends to the outside of the pressure vessel 10 for connection to a sodium source. The sodium charge line 18 extends down the inner wall of the main vessel 111 to the bottom head of the main vessel 111. In some embodiments, the gap between the main vessel 111 and the guard vessel 112 may be filled with argon, and the guard vessel 112 may contain and keep the sodium circulation uninterrupted in the event of a leak in the main vessel 111.

As shown in fig. 1, in some embodiments, a radially inner side of the top connection ring 113 may form a stepped surface 1131; the top cover 12 comprises an inner cover body 122 detachably arranged at the step surface 1131 and an outer cover body 121 detachably arranged at the upper end surface of the top connecting ring 113, a gap is formed between the inner cover body 122 and the outer cover body 121, and a shielding layer 14 is arranged on the lower surface of the inner cover body 122; the top cover 12 is also provided with a control rod tube seat 15 penetrating through the outer cover 121 and the inner cover 122, and the control rod tube seat 15 can provide support and guide for a control rod driving mechanism and is also provided with corresponding penetrating interfaces for the control rod driving mechanism and other parts needing to be penetrated. Referring to fig. 3, a plurality of control rod sockets 15 are circumferentially provided at the middle of the outer cap 121.

The inner cap 122 and the outer cap 121 are all an integral piece, and the cap is not provided with a cock, so that miniaturization of the reactor is facilitated.

In some embodiments, the outer cover 121 may have a lifting member 1211 welded thereto for lifting the outer cover 121.

In some embodiments, the shielding layer 14 may be a unitary structure formed by a stainless steel material housing and an internal boron carbide shield for shielding the upper portion of the core. The inner cover 122 may be a flange, and the shielding layer 14 is integrally mounted on the step surface 1131 through the flange, and is fixedly pressed through bolts.

The outer cover 121 is a removable structure to facilitate servicing and maintenance of the internal equipment of the pressure vessel 10. The outer cap 121 is fixedly connected with the top connection ring 113 by bolts.

In some embodiments, the outer cover 121 and the top connecting ring 113 may be screwed, and a sealing ring may be disposed between the outer cover 121 and the top connecting ring 113 to ensure the overall sealing performance. The sealing ring can be a metal C-shaped ring, and the medium environment requirement and the temperature requirement need to be met. Further, the outer cover 121 and the top connecting ring 113 can be sealed by using double sealing rings, so as to improve the sealing reliability, and a leakage detecting hole can be further formed between the two sealing rings for detecting the leakage of the first sealing.

In some embodiments, the bottom of the core assembly 20 may be provided with a plurality of pins 212, the sidewalls of the pins 212 forming openings, coolant entering the coolant flow channels of the core assembly 20 via the openings of the pins 212, the reactor further comprising a box structure 30, the box structure 30 being connected to the pressure vessel 10 at the bottom of the core assembly 20, the top of the box structure 30 being provided with a plurality of top openings for the plurality of pins 212 to be inserted into the box structure 30, wherein the sidewalls of the box structure 30 form a plurality of water inlets through which coolant returning into the pressure vessel 10 via the return water channel 17 enters the interior of the box structure 30 and enters the coolant flow channels via the openings of the pins 212.

The pins 212 are not fixed to the box structure 30 to ensure that the bottom of the core assembly 20 is free. In addition, in the related art, the roof header in the large-sized reactor has a complicated structure, and the box structure 30 provided in the embodiment of the present application has a simple structure, and is easy to realize miniaturization of the reactor.

In some embodiments, referring to fig. 1, the box structure 30 may include a top plate 31, a bottom plate 32 facing the top plate 31, and a circumferential side plate 33 connecting between the top plate 31 and the bottom plate 32, wherein a plurality of water inlets of the box structure 30 are provided at the circumferential side plate 33, and a plurality of top openings of the box structure 30 are provided at the top plate 31.

In some embodiments, the core assembly 20 may include a core barrel 22 and a plurality of fuel assemblies 21 disposed within the core barrel 22, and a suspension fitting 221 may be formed at a top end of the core barrel 22. The suspension mating portion 221 may be integrally formed with the core barrel 22. The hanging fitting 221 may be a flange structure.

The top plate 31 may also be provided with a plurality of second openings for coolant to flow to the gaps between the plurality of fuel assemblies 21 and the gaps between the fuel assemblies 21 and the core barrel 22. The second opening is small in size, allowing a small amount of coolant to flow to the gaps between the plurality of fuel assemblies 21 and the gaps between the fuel assemblies 21 and the core barrel 22, forming cooling channels outside the fuel assemblies 21.

The core shroud 22 may be a cylindrical barrel structure, the core shroud 22 surrounding the fuel assemblies 21 and associated assemblies to isolate the coolant within the pressure vessel from the core assemblies 20 and to form channels therein for coolant to flow up the core.

In some embodiments, each fuel assembly 21 includes a housing and a plurality of fuel elements disposed within the housing, each housing having a head 211 and a pin 212 at each of its upper and lower ends. The head 211 forms an outlet for the coolant to flow out. Coolant enters the housing from the openings in the side walls of the pins 212, flows up the outer surface of the fuel element to the head 211, and exits the core assembly 20 from the outlet.

In some embodiments, the core assembly 20 may further include an upper connecting plate 23, the upper connecting plate 23 being connected with an upper end of the core barrel 22. Wherein the upper connection plate 23 has a plurality of upper openings, and the head 211 of each fuel assembly 21 is connected with the upper connection plate 23 through one upper opening.

In some embodiments, the core assembly 20 may include a lower connecting plate having a plurality of lower openings through which the pins 212 of each fuel assembly 21 are connected to the lower connecting plate.

In some embodiments, the side wall of the pressure vessel 10 facing the box structure 30 may be formed with a plurality of mounting blocks 1113 disposed at intervals in the circumferential direction, and the box structure 30 is fixed to the side wall of the pressure vessel 10 by the mounting blocks 1113; the coolant returned into the pressure vessel 10 via the return water channel 17 flows down to the water inlet of the box structure 30 via the space between the adjacent two mounting blocks 1113.

In some embodiments, each mounting block 1113 may interface with the bottom of one of the stops 1112, and the projected profile of each stop 1112 in the horizontal plane is within the projected profile of one of the mounting blocks 1113 in the horizontal plane. This arrangement minimizes the adverse effects of the mounting block 1113 and the stop 1112 on the coolant flow, facilitating rapid coolant flow down the mounting block 1113 to enter the box structure 30.

The water inlet of the box structure 30 can be opposite to the interval between the two mounting blocks 1113, and the lower end edge of the water inlet is not lower than the lower end edge of the mounting block 1113, so that the coolant can quickly enter the water inlet.

In some embodiments, the reactor may further include a plurality of thermal displacement difference compensators respectively provided at the water outlet passage 16 and the water return passage 17 for compensating for different thermal displacement differences of the main vessel 111 and the protection vessel 112.

The thermal displacement difference compensator may be, for example, a bellows. Since the water outlet passage 16 and the water return passage 17 penetrate the main tank 111 and the protection tank 112, the main tank 111 and the protection tank 112 are thermally displaced. It will be readily appreciated that the temperature of the main vessel 111 is relatively high, the temperature of the protection vessel 112 is relatively low, and the thermal displacements generated by the main vessel 111 and the protection vessel 112 are different, so that it is necessary to provide the outlet channel thermal displacement difference compensator 161 and the return channel thermal displacement difference compensator 171 to compensate the thermal displacements generated by the main vessel 111 and the protection vessel 112, respectively.

Further, the pipe walls of the channels may be fixedly connected to the main container 111, respectively, the pipe walls of the channels are not fixed to the protection container 112, one end of the bellows is fixed to the channels outside the protection container 112, and the other end is fixed to the protection container 112 outside the protection container 112.

The pressure vessel 10 and the internals may be selected from 316H stainless steel.

The pressure vessel 10 together with a circuit acts as a pressure boundary for the reactor sodium coolant; ensuring that the coolant is unobstructed in the prescribed flow path, carrying heat out of the reactor.

In some embodiments, fins are welded to the protective vessel 112 to increase the heat exchange area. By providing fins, the heat exchange area can be made 4 times the area of the outer wall of the protective container 112.

As shown in fig. 5, fig. 5 shows a schematic view of a support vessel 40 in accordance with an embodiment of the present application, in which the reactor may further include a support vessel 40, with the pressure vessel 10 being suspended entirely within the support vessel 40.

The support vessel 40 is used to provide integral support for the reactor body, and the bottom of the support vessel 40 may be connected to the container floor by fasteners. The material of the support container 40 may be, for example, 316H stainless steel.

The reactor of the embodiment of the application is compact and has overall transportability. The support vessel 40, the pressure vessel 10, and the internals together act as a biological shield to protect the personnel.

Under normal working conditions, the supporting container 40 works at normal temperature and normal pressure; under accident conditions, the accident waste heat removal system is put into operation, and the support vessel 40 provides a flow path for the coolant medium of the accident waste heat removal system.

In some embodiments, the support container 40 includes a container body having an upper opening and a cover 47 for closing the opening of the container body. In some embodiments, the radially inner side of the upper end of the container body may form a stepped surface 46; the pressure vessel 10 is suspended from the step surface 46. There is a space between the cover 47 and the pressure vessel 10.

The cover 47 is provided with a relief channel 471 for the passage of the control rod socket 15.

In some embodiments, the lower-middle portion of the support vessel 40 may be provided with a plurality of radial stoppers 41 arranged at intervals in the circumferential direction, the plurality of radial stoppers 41 being in clearance fit with the pressure vessel 10 for preventing the pressure vessel 10 from moving in the radial direction when an earthquake occurs.

In some embodiments, the side walls of the support container 40 may be formed with insulation 42. To reduce the radial dimension of the support vessel 40, a thermal insulation layer 42 is formed below the step surface 46. The insulation 42 serves to limit heat loss from the reactor and to reduce temperature differentials across the walls of the reactor pressure vessel 10. In some embodiments, insulation 42 may be a nano aerogel insulation to further enhance the insulation effect.

In some embodiments, the side walls of the support container 40 may also be provided with a plurality of ventilation ducts for ventilating the interior of the support container 40.

Specifically, as shown in fig. 5 to 7, a plurality of first ventilation pipes 43 may be provided in the circumferential direction at a portion below the lowest point of the lower head of the pressure vessel 10 at the lower portion of the support vessel 40. A plurality of second ventilation pipes 44 may be provided in the circumferential direction at an upper portion of the support vessel 40 above the coolant level of the pressure vessel 10. This positioning of the vent tube provides for a better venting effect while also reducing the adverse effects on the pressure vessel 10.

The first ventilation tube 43 may be connected to the support container 40 using a flange extending beyond the outer wall of the support container 40. The second ventilation duct 44 is also flanged to the support vessel 40. The second ventilation pipe 44 may be connected to a 90 ° elbow flange after extending out of the outer wall of the support container 40, and the elbow flange extends upward to facilitate the air circulation flow.

Further, the number of the first ventilation pipes 43 and the second ventilation pipes 44 is the same. Each first ventilation pipe 43 may be disposed directly below one second ventilation pipe 44, and each first ventilation pipe 43 may have the same projection position on the horizontal plane as the second ventilation pipe 44 directly below it, so as to facilitate the air circulation.

In some embodiments, the number of the first ventilation pipes 43 and the second ventilation pipes 44 is 4, the 4 first ventilation pipes 43 are uniformly distributed in the circumferential direction, and the 4 second ventilation pipes 44 are uniformly distributed in the circumferential direction.

In some embodiments, two openings 45 may also be provided in the side wall of the support vessel 40 for the passage of the heat exchanger tubing and the pump tubing, respectively, into the interior of the support vessel 40 for connection with the pressure vessel 10.

In some embodiments, only the pressure vessel 10 is suspended in the support vessel 40, and the pressure vessel 10 and the support vessel 40 are directly faced, and no other shielding member exists between the two, so that the structure is compact, and the design is simple.

In some embodiments, the support vessel 40 includes a bottom plate 48, the bottom plate 48 forming a flange 481 protruding from the side wall of the vessel body, the flange 481 being provided with a plurality of mounting holes for mounting the support vessel 40 to a transport apparatus by fasteners, such that the reactor of the embodiments of the present application has a modular structure, enabling the overall transport.

It should also be noted that, in the embodiments of the present application, the features of the embodiments and the embodiments of the present application may be combined with each other to obtain new embodiments without conflict.

The above is only a specific embodiment of the present application, but the scope of the present application should not be limited thereto, and the scope of the present application should be determined by the scope of the claims.

Claims (16)

1. A reactor, comprising:

the cooling device comprises a pressure container, a cooling device and a cooling device, wherein the pressure container is used for containing coolant, the side wall of the pressure container is provided with a plurality of water outlet channels and a plurality of water return channels, the water outlet channels are used for leading out the coolant in the pressure container from the pressure container for cooling, and the water return channels are used for returning the cooled coolant into the pressure container; and

a core assembly disposed within the pressure vessel, the core assembly having a plurality of coolant channels formed therein,

the side wall of the pressure vessel forms a hanging part, and the top end of the reactor core assembly forms a hanging matching part so as to hang the reactor core assembly on the pressure vessel through the matching of the hanging matching part and the hanging part;

the suspension part is positioned below the water outlet channel and above the water return channel, and the coolant entering the pressure vessel through the water return channel flows downwards to the bottom of the reactor core assembly, flows upwards to the upper side of the reactor core assembly along the coolant flow channel inside the reactor core assembly and then enters the water outlet channel.

2. The reactor of claim 1 wherein the suspension is an annular projection extending radially toward the core assembly at a sidewall of the pressure vessel;

the suspension mating portion is an annular flange projecting radially outwardly from the core assembly top end.

3. The reactor of claim 2 wherein the core assembly bottom is free-standing,

the side wall of the pressure vessel facing the bottom of the reactor core assembly extends out of a plurality of stoppers along the radial direction towards the bottom of the reactor core assembly, the stoppers are arranged at intervals along the circumferential direction of the pressure vessel, and the stoppers are in clearance fit with the bottom of the reactor core assembly and are used for preventing the bottom of the reactor core assembly from moving along the radial direction.

4. The reactor of claim 3, wherein the pressure vessel comprises a pressure vessel body having an upper opening and a top cover for closing the opening of the pressure vessel body, wherein the pressure vessel body comprises a main vessel located radially inward, a protection vessel located radially outward of the main vessel, and a top connection ring connected to upper ends of the main vessel and the protection vessel,

the protective container is provided with a plurality of limiting pieces which are arranged at intervals along the circumferential direction, the limiting pieces are in clearance fit with the main container and are used for preventing the main container from moving along the radial direction, and each limiting piece corresponds to one stop block in position.

5. The reactor of claim 4, wherein a radially inner side of the top connecting ring forms a stepped surface;

the top cover comprises an inner cover body detachably arranged at the step surface and an outer cover body detachably arranged at the upper end surface of the top connecting ring;

a gap is formed between the inner cover body and the outer cover body, and a shielding layer is arranged on the lower surface of the inner cover body;

the top cover is also provided with a control rod tube seat penetrating through the outer cover body and the inner cover body.

6. The reactor of claim 3 wherein the bottom of the core assembly is provided with a plurality of pins, the sidewalls of the pins forming openings through which coolant enters the coolant flow channels of the core assembly,

the reactor further includes: a box structure connected with the pressure vessel at the bottom of the reactor core assembly, a plurality of top openings are arranged at the top of the box structure for inserting the pins into the box structure,

the side wall of the box-type structure is provided with a plurality of water inlets, and the coolant returned into the pressure container through the water return channel enters the box-type structure through the plurality of water inlets and enters the coolant flow channel through the opening of the pin.

7. The reactor of claim 6, wherein the box structure comprises: a top plate, a bottom plate facing the top plate, and a peripheral side plate connecting between the top plate and the bottom plate,

wherein, a plurality of water inlets set up circumference curb plate, a plurality of open-top sets up the roof.

8. The reactor of claim 7 wherein the core assembly comprises: a core shroud and a plurality of fuel assemblies disposed within the core shroud, the annular flange formed on top of the core shroud;

the top plate is also provided with a plurality of second openings for coolant to flow to gaps between the plurality of fuel assemblies and gaps between the fuel assemblies and the core barrel.

9. The reactor of claim 8, wherein each of the fuel assemblies comprises a housing and a plurality of fuel elements disposed within the housing,

the upper end and the lower end of each shell are respectively provided with a head and a pin,

the core assembly further includes an upper connecting plate connected with the upper end of the core barrel, the upper connecting plate having a plurality of upper openings, the head of each fuel assembly being connected with the upper connecting plate through one of the upper openings.

10. The reactor of claim 6, wherein the side wall of the pressure vessel facing the tank structure forms a plurality of mounting blocks disposed at intervals in a circumferential direction, the tank structure being fixed to the side wall of the pressure vessel by the mounting blocks;

the coolant returned into the pressure vessel via the water return channel flows down to the water inlet of the box-type structure via the space between two adjacent mounting blocks.

11. The reactor of claim 10, wherein each of the mounting blocks meets a bottom of one of the blocks and the projection profile of each of the blocks in the horizontal plane is within the projection profile of one of the mounting blocks in the horizontal plane.

12. The reactor of claim 4, further comprising: the plurality of thermal displacement difference compensation pieces are respectively arranged at the water outlet channel and the water return channel and are used for compensating different thermal displacement differences of the main container and the protection container.

13. The reactor of any one of claims 1-12, further comprising:

and the pressure container is integrally hung in the supporting container.

14. The reactor of claim 13, wherein a lower-middle portion of the support vessel is provided with a plurality of radial stops circumferentially spaced apart, the plurality of radial stops being in clearance fit with the pressure vessel for preventing radial movement of the pressure vessel.

15. The reactor of claim 13, wherein a sidewall of the support vessel is formed with an insulation layer.

16. The reactor of claim 13, wherein the side wall of the support vessel is further provided with a plurality of ventilation ducts for ventilating the interior of the support vessel.