An integrated modular molten salt reactor core assembly

Abstract

The application relates to a kind of integrated modular molten salt reactor core device, graphite core module is arranged in the lower part inside container module, for nuclear fission heat release;Container module is load bearing matrix and integrates heat exchanger to realize reactor core cooling and heat distribution;Integrated reactor head module can be detachably installed on the top flange of container module, extends into the container interior, realizes molten salt circulation driving, reaction rate regulation and cavity sealing;Three modules are independent of each other, can be prefabricated and transported, and the graphite core module can be individually lifted out for overall replacement.The modules of the application can be preassembled and detected in the workshop, which reduces the assembly difficulty, improves the construction precision, shortens the construction period, suppresses the graphite dislocation caused by buoyancy, thermal expansion and irradiation shrinkage, prevents debris from blocking the flow channel, and completely solves various defects of traditional integrated molten salt reactor construction, operation and maintenance, structural stability and pipeline assembly.

Description

Technical Field

[0001] This invention belongs to the field of nuclear reactor equipment technology, specifically relating to an integrated modular molten salt reactor core device. Background Technology

[0002] Molten salt reactors use molten salt as the nuclear fuel carrier and primary loop heat exchange medium, possessing inherent advantages such as high safety, flexible fuel cycle path, and wide operating temperature range, making them a key development direction for next-generation advanced nuclear reactors. Existing conventional molten salt reactor cores are fixed, welded monolithic structures. The main vessel, core graphite, heat exchange components, top piping, and control and drive mechanisms are all assembled and welded layer by layer on-site. The entire reactor body lacks modular units that can be independently disassembled, prefabricated, and transported, resulting in numerous inherent defects throughout the construction, operation, and refueling processes.

[0003] First, existing reactor structures are difficult to construct, have long construction periods, and struggle to guarantee assembly precision. In traditional molten salt reactors, all internal shielding graphite, supports, heat exchangers, piping, and top equipment must be hoisted, aligned, welded, and calibrated on-site for radiation protection, resulting in complex on-site procedures. Furthermore, the layered graphite stacking within the reactor lacks standardized limiting structures; multiple layers of graphite blocks are simply bonded together without interlayer, circumferential, or axial constraints. Under the influence of buoyancy and temperature deformation, slippage and misalignment are highly likely, compressing heat exchange channels and generating graphite debris, causing pipe blockage. Simultaneously, the significant difference in thermal expansion coefficients between the metal support structure and the graphite shielding components, coupled with the lack of suitable deformation compensation gaps, makes them prone to structural compression and graphite failure under long-term high-temperature operation. Additionally, the traditional reactor bottom molten salt feed channel openings have stepped dead angles, easily creating turbulence and medium stagnation during molten salt flow. This leads to uneven medium flow distribution across heat exchange branches, large load differences in individual heat exchangers, and poor overall heat dissipation uniformity of the reactor core.

[0004] Secondly, traditional reactor cores lack the capability for overall hoisting and replacement, resulting in high radiation risks and prolonged downtime during refueling operations. In conventional molten salt reactors, the graphite, support, and heat exchange structures are welded and fixed as a single unit. Replacing aged core graphite requires dismantling all piping, control sleeves, and heat exchange equipment at the reactor top, disassembling multiple layers of graphite blocks and shielding components layer by layer. This exposes operators to prolonged exposure to radioactivity, resulting in high radiation doses. Furthermore, the dismantling and restoration process involves numerous piping sealing and coaxiality calibration procedures, leading to reactor shutdowns and maintenance periods lasting several months, significantly reducing the economic efficiency of power plant operations. Existing technologies that use a few separate graphite block core structures only employ short-segment locating pins, failing to create a continuous, integrated restraint system. They also lack a dedicated, detachable hoisting and support structure, preventing the overall removal and replacement of the core and still requiring on-site dismantling operations.

[0005] Third, the assembly tolerance of the top piping is low, and the operational stability of the control and startup equipment is insufficient. In existing molten salt reactors, the molten salt circulation piping at the top of the reactor core is rigidly welded to the heat exchanger below. Dimensional deviations caused by manufacturing and hoisting cannot be compensated for, making alignment during assembly difficult and easily generating assembly stress. Long-term operation can lead to weld fatigue leakage. The control rod sleeves and startup sleeves inside the reactor core are only simply fixed at both ends, lacking multi-point segmented support structures in the middle section. Under fluid scouring, vibration, and temperature deformation, the sleeves are prone to shifting and swaying, causing control rod action to become stuck and power regulation accuracy to decrease. Furthermore, the top pump body, diversion piping, and sleeve support structures are installed separately and independently, making integrated pre-assembly and commissioning impossible within the plant. All piping coaxiality, sealing performance, and flow distribution tests must be completed on-site, resulting in a huge workload for on-site commissioning.

[0006] Fourth, the material cost of existing reactor core neutron shielding structures is relatively high, and the neutron utilization efficiency is relatively low. Traditional molten salt reactors do not have a sealed chamber at the bottom filled with shielding graphite, and the internal cavity volume is large, requiring a large amount of expensive molten salt fuel to maintain operation, resulting in high operating material costs; the neutron reflector on the outside of the reactor core is mostly locally arranged, resulting in a large amount of neutron lateral leakage and low nuclear fuel fission utilization rate. Summary of the Invention

[0007] To address the problems of poor construction precision, long on-site construction cycle, inability to replace the core as a whole, high risk of refueling irradiation, long downtime, low fault tolerance rate of rigid connection assembly between the reactor top and container pipelines, and easy slippage and misalignment of graphite inside the reactor due to the lack of an overall limiting structure, this invention aims to provide an integrated modular molten salt reactor core device.

[0008] According to the integrated modular molten salt reactor core device of the present invention, it includes an integrated top module, a container module, and a graphite core module; the graphite core module is arranged in the lower region inside the container module for nuclear fission reaction and heat release; the container module is an integral supporting substrate with an integrated heat exchanger, which forms a cooling structure for the graphite core module and realizes the primary loop transfer and distribution of core fission heat; the integrated top module is detachably assembled on the top flange end face of the container module, the lower part of the integrated top module extends into the container module and is located above the graphite core module, the integrated top module is used to drive the molten salt fuel circulation in the reactor, regulate the core reaction rate, and seal the top cavity of the container module; the integrated top module, container module, and graphite core module are independent and prefabricated and transportable modular structures, and the graphite core module can be lifted out individually for overall replacement. This invention breaks through the limitations of traditional molten salt reactors, which are welded as a whole and cannot be disassembled, by dividing the reactor body into three independent functional modules that can be prefabricated, transported, and disassembled individually. It enables batch prefabrication in the factory and rapid on-site assembly, while also supporting independent replacement of the core modules. This significantly shortens the construction and refueling period and reduces the risks of on-site construction and irradiation operations.

[0009] In a preferred embodiment, the container module includes a main container, an outer graphite layer, a surrounding cylinder, a side reflective layer, a surrounding cylinder outer support plate, a surrounding cylinder assembly bottom plate, a support ring, a bottom plate support, a lower chamber graphite layer, and the heat exchanger. The main container sidewall is provided with a molten salt inlet pipe and a molten salt outlet pipe. The bottom plate support, support ring, surrounding cylinder outer support plate, and surrounding cylinder assembly bottom plate, together with the lower end cap of the main container, form a closed chamber, which is filled with lower chamber graphite. The outer graphite layer and multiple heat exchangers are arranged alternately along the circumferential direction of the main container's inner wall. The surrounding cylinder is located in the hollow area inside the outer graphite layer. A thermal expansion compensation gap is reserved between the surrounding cylinder and the outer graphite layer. A side reflective layer is fitted onto the inner wall of the surrounding cylinder. The lower end of the heat exchanger is connected to the heat exchanger nozzle via a lower socket fitting with a universal joint compensation structure, forming an adaptive flexible docking flow channel structure. This invention integrates graphite shielding, neutron reflection, support and load-bearing, and heat exchange pipeline into a single container module. It also adopts a flexible plug-in pipeline with a gap design for expansion between hot and cold structures, which can accommodate the deformation differences between metal and graphite under high-temperature conditions, eliminate assembly stress, reduce pipeline assembly accuracy requirements, and avoid structural extrusion deformation and media leakage.

[0010] In a preferred embodiment, the annular sidewall of the base plate support has uniformly spaced square openings, and square channels are installed within these openings. The square channels are arranged horizontally along the radial direction of the base plate support, with their upper ends connecting to the heat exchanger nozzles. The outer end faces of the square channels are flush with the sidewall of the base plate support without steps. The square channels are directly opposite the molten salt inlet nozzle, forming a molten salt feeding structure with no dead zones and uniform flow distribution. This invention, by setting up a circumferentially distributed square channel structure directly opposite the inlet nozzle with flush, step-free end faces, can completely eliminate dead zones and turbulent flow deviations in the molten salt fluid, achieving uniform flow distribution across the four heat exchange branches, ensuring consistent load on each heat exchanger, and improving the stability and uniformity of the primary loop heat exchange within the reactor.

[0011] In a preferred embodiment, the outer graphite is composed of multiple stacked graphite blocks, with locating pins used to limit the movement between adjacent graphite blocks and between the graphite blocks and the outer support plate of the casing. These locating pins form a horizontal anti-slip and anti-misalignment constraint structure for the multi-layered graphite blocks, suppressing graphite displacement caused by molten salt buoyancy and thermal expansion, and preventing changes in flow channel gaps and the generation of graphite debris. This invention, through a bidirectional locating pin limiting structure between and at the bottom of the multi-layered graphite blocks, can resist the slippage and displacement forces caused by high-temperature molten salt buoyancy and thermal expansion, preventing graphite misalignment and compression of the heat exchange channels, eliminating graphite debris shedding and flow channel blockage problems, and improving the long-term structural stability within the reactor.

[0012] In a preferred embodiment, the graphite core module includes a clamping steel plate, core graphite, clamping band, core base plate, graphite cylindrical pins, and lifting rods; the core graphite is stacked vertically in multiple layers and has a through molten salt channel inside; the core base plate is a hollow ring structure with a channel opening that connects to the molten salt channel; the graphite cylindrical pins vertically penetrate each layer of core graphite and are inserted and fixed to the core base plate; the clamping band is sleeved on the outside of the bottom core graphite to achieve circumferential pre-tightening; the clamping steel plate is pressed onto the top of the core graphite to achieve axial limiting; the graphite cylindrical pins, clamping bands, and clamping steel plate work together to form a three-dimensional composite limiting structure with interlayer lateral, bottom circumferential, and overall axial dimensions. This invention uses a three-dimensional composite limiting structure of core axial direction, circumferential direction, and interlayer to comprehensively constrain the displacement deviation of core graphite under multiple working conditions such as hoisting and transportation, high temperature buoyancy, irradiation deformation, and thermal expansion deformation. It solves the defects of traditional core limiting, easy interlayer separation, and radial disintegration, and ensures that the molten salt flow channel is regular and connected throughout the entire process.

[0013] In a preferred embodiment, the graphite cylindrical pin is a full-height through-type positioning structure. The graphite cylindrical pin counteracts molten salt buoyancy and interlayer shear displacement, constraining interlayer misalignment of the graphite layers in the multi-layer reactor core. The clamping band counteracts the thermal expansion stress of the core graphite, restricting the radial opening of the bottom graphite layer and ensuring the regular and continuous molten salt flow channel structure under all operating conditions. This invention, through the combination of a full-height through-type cylindrical pin and a bottom clamping band reinforcement structure, can specifically counteract high-temperature buoyancy and thermal expansion stress, preventing interlayer misalignment and radial opening of the bottom graphite layer, effectively avoiding flow channel deformation, misalignment, and blockage faults, and significantly improving the long-term operational reliability of the reactor core.

[0014] In a preferred embodiment, the graphite core module further includes a lifting rod that passes through the clamping steel plate and the graphite core, and is threadedly locked to the core base plate. This invention, by setting up the lifting rod, can form a complete, integrated lifting and support structure, enabling the overall lifting and transportation of the graphite core module, and its overall placement in the container. After the module is assembled, the lifting rod can be unscrewed and removed, leaving no component residue. This provides a reliable lifting carrier for the later independent, overall lifting and replacement of the core, reducing the difficulty of irradiation dismantling operations.

[0015] In a preferred embodiment, the upper end of the lifting rod is exposed on the surface of the clamping steel plate to form a lifting station. After assembly, the lifting rod can be removed individually without damaging the internal flow channel structure of the reactor core. This invention adopts a detachable threaded lifting rod structure, which meets the requirements of overall module prefabrication and overall lifting into the tank. After assembly, there are no component residues, which facilitates the later individual lifting out and replacement of the reactor core.

[0016] In a preferred embodiment, the integrated reactor top module includes a reactor top structure, a reactor start-up system, a control rod system, a sleeve support channel, a top cover cylinder, a molten salt pump chamber, a loop pipe section, an upper chamber head, and a pump chamber loop pipe connection. The molten salt pump chamber vertically penetrates the center of the upper chamber head. The loop pipe sections are symmetrically arranged on both sides of the molten salt pump chamber, and the loop pipe sections branch into multiple sets of branch pipe sections. The bottom end of each branch pipe section is adaptively inserted into the upper pipe connection of the heat exchanger through a pump chamber loop pipe connection with a universal joint structure, forming a flexible pipeline docking structure with multi-angle and deviation compensation. The sleeve support channel provides segmented limiting support for the reactor start-up system sleeve and the control rod sleeve. The two types of sleeves vertically penetrate the reactor top module and extend into the interior of the graphite core module. This invention, through an integrated pump chamber at the top of the reactor, multiple diversion pipelines, a universal adaptive docking structure, and a segmented support structure for the casing, can compensate for assembly alignment deviations during the overall hoisting of the reactor top, reduce on-site assembly difficulty, suppress casing vibration and offset, ensure precise and reliable operation of control and startup equipment, and achieve precise connection of the flow path at the top of the reactor.

[0017] In a preferred embodiment, the pump chamber circuit connector and the lower socket fitting form a double universal flexible plug-in flow channel at both ends of the heat exchanger. This invention simultaneously sets universal compensation plug-in structures at both ends of the heat exchanger, compensating for assembly deviations in both the upper stack top and lower container modules, reducing the overall assembly accuracy requirements, and minimizing pipeline assembly stress and media bypass.

[0018] This invention disassembles the reactor into independent, prefabricated, and transportable integrated top module, container module, and graphite core module. All modules can be pre-assembled and precision-tested in the plant before being transported to the construction site for direct assembly, significantly reducing on-site assembly difficulty, improving overall construction accuracy, and shortening the construction cycle. The graphite core module can be lifted out individually for complete replacement without disassembling other supporting, heat exchange, and shielding components within the reactor, significantly reducing the radioactive exposure time for operators and shortening the reactor shutdown and refueling cycle. The container module has a heat exchanger with a universal joint compensation structure at its lower end. The integrated top module is equipped with a universal adaptive pump chamber circuit pipe, which together form a flexible flow channel at both ends of the heat exchanger. It can autonomously compensate for the alignment deviation caused by manufacturing and hoisting, and eliminate the assembly stress caused by rigid docking. The whole set of equipment uses a three-dimensional composite limiting structure to constrain the displacement and misalignment of graphite blocks under the conditions of medium buoyancy, thermal expansion and deformation and irradiation contraction. This avoids the generation of graphite debris and blockage of heat exchange channels, and overcomes the defects of traditional integrated molten salt reactor cores in terms of construction, operation and maintenance, structural stability and pipeline assembly. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the modular main structure of the integrated molten salt reactor core of the present invention;

[0020] Figure 2 This is a schematic diagram of the modular main structure of the container of the present invention;

[0021] Figure 3 This is a schematic diagram of the heat exchanger structure and arrangement of the present invention;

[0022] Figure 4 This is an enlarged schematic diagram of the square channel of the present invention;

[0023] Figure 5 This is a schematic diagram of the molten salt nozzle arrangement of the main container of the present invention;

[0024] Figure 6 This is a schematic diagram of the graphite core module structure of the present invention;

[0025] Figure 7 This is a schematic diagram of the lifting rod structure and arrangement of the present invention;

[0026] Figure 8 This is a schematic diagram of the integrated stack top module structure of the present invention;

[0027] Figure 9 This is a schematic diagram of the loop pipe section arrangement of the present invention;

[0028] Figure 10 This is a schematic diagram of the internal circulation process of the molten salt reactor according to the present invention. Detailed Implementation

[0029] like Figure 1 As shown, the integrated molten salt reactor core modular structure of the present invention includes an integrated top module 1, a container module 2, and a graphite core module 3.

[0030] The graphite core module 3 is located in the lower region inside the container module 2, serving as the carrier unit for the core fission reaction. Here, fissile nuclides in the primary circuit fuel molten salt undergo chain fission, releasing heat. The container module 2, as the overall supporting structure, integrates an internal heat exchange structure (i.e., Figure 3 The heat exchanger 210 cools the graphite core module 3 on one hand and transfers and distributes the fission heat generated by the graphite core module 3 within the primary loop on the other. The integrated top module 1 is located on the top of the equipment and is supported and installed on the main vessel flange of the container module 2. Its lower structure extends into the interior of the container module 2 and is located above the graphite core module 3. It is used to drive the fuel molten salt circulation that runs through the container module 2 and the graphite core module 3, regulate the nuclear reaction rate inside the graphite core module 3, and seal the top cavity of the container module 2.

[0031] This invention breaks down the entire reactor body into three independent prefabricated modules. Compared with the traditional integrated molten salt reactor, it can realize batch prefabrication in the factory, independent transportation, and rapid on-site assembly. At the same time, the old graphite core module 3 can be lifted out separately for replacement, solving the technical defects of traditional reactor cores that cannot be replaced as a whole, long on-site construction cycle, and high risk of irradiation refueling.

[0032] like Figure 2 and Figure 3 As shown, container module 2 is the basic structure for modular installation of the reactor core, including main container 21, outer graphite 22, shroud 23, side reflector layer 24, shroud outer support plate 25, shroud assembly bottom plate 26, support ring 27, bottom plate support 28, lower chamber graphite 29 and heat exchanger 210.

[0033] The main container 21 serves as the mounting base for the entire module, supporting various other structures and equipment. The main body of the main container 21 is a vertical cylindrical wall with a molten salt inlet pipe 211 mounted on it. The upper end of the main body is open, forming a main container flange for sealing and securing the integrated top module 1 above. The lower end of the main body is a downward-arching, arc-shaped lower head.

[0034] The base plate support 28 is a segmented ring component, consisting of an upper ring structure, a middle circular plate, and a lower ring structure. It is fixedly supported on the inner wall of the lower end cap of the main container 21 and forms the basis of the entire support structure at the bottom of the container module.

[0035] The support ring 27 is coaxially arranged with the bottom plate support 28 and is located on the radial outer side of the bottom plate support 28. It is also fixed on the inner wall of the lower end cap of the main container 21.

[0036] The outer support plate 25 of the outer casing is arranged concentrically with the main container 21 and is fixedly installed on the upper end face of the support ring 27.

[0037] On the radial inner side of the outer support plate 25 of the outer cylinder, the bottom plate 26 of the outer cylinder assembly is fixedly installed on the upper end face of the bottom plate support 28. On the one hand, it serves as the bottom bearing base of the outer cylinder 23 and its inner side reflective layer 24, supporting the outer cylinder 23 and the side reflective layer 24; on the other hand, after the graphite core module 3 is hoisted into place, it is placed as a whole in the internal cavity of the outer cylinder 23, and its bottom is supported by the bottom plate 26 of the outer cylinder assembly. Therefore, the bottom plate 26 of the outer cylinder assembly also bears the overall load of the graphite core module 3.

[0038] The main container 21 is enclosed by the lower end cap, the bottom plate 26 of the surrounding cylinder assembly, the outer support plate 25 of the surrounding cylinder, the support ring 27 and the bottom plate support 28 to form a closed chamber. The interior of this chamber is completely filled with the lower chamber graphite 29, which is used to reduce the amount of fuel molten salt used and reduce the cost of molten salt material input.

[0039] The outer graphite columns 22 are arranged circumferentially along the inner wall of the vertical cylinder of the main container 21, forming four groups of graphite columns. These four groups of graphite columns and four heat exchangers 210 are distributed alternately along the circumference, forming a graphite column-heat exchanger-graphite column-heat exchanger arrangement. It should be understood that the function of the outer graphite columns 22 is to fill the cavity to reduce the amount of molten salt used. The outer support plate 25 is located at the bottom of the outer graphite columns 22, providing vertical support and, in conjunction with positioning pins, achieving lateral positioning. Each group of outer graphite columns 22 consists of multiple stacked graphite blocks. Positioning pins are installed between adjacent graphite blocks and between the graphite blocks and the outer support plate 25 to effectively prevent horizontal displacement and misalignment of the graphite columns. Compared to the traditional graphite arrangement in the stack without graphite limiting structure, the multi-layer positioning pin limiting structure can prevent graphite from slipping and misaligning under the buoyancy and thermal expansion of high-temperature molten salt. If the graphite column slips, it will squeeze the molten salt flow gap around the heat exchanger and wear to produce graphite debris, which will then cause blockage of the molten salt distribution channel and the heat exchange channel of the heat exchanger in the stack.

[0040] The surrounding cylinder 23 is a rigid metal support cylinder set within the hollow area formed by the outer graphite 22. A gap is reserved between the surrounding cylinder 23 and the outer graphite 22. This gap is only used to compensate for the difference in thermal expansion between the graphite component and the metal component under high-temperature conditions, and to avoid deformation caused by mutual compression after thermal deformation.

[0041] The side reflector layer 24 is an independent graphite lining component integrally bonded to the inner wall of the casing 23. The side reflector layer 24 is the core component for realizing neutron reflection, and together with the casing 23, it forms a complete neutron reflection and lateral shielding structure on the outside of the graphite core module 3.

[0042] Each heat exchanger 210 has an upper connecting pipe 2101 arranged upwards along its own central axis, serving as an interface for connecting to the molten salt pump pipeline within the integrated top module 1. Each heat exchanger 210 also has a lower pipe port 2102 arranged downwards along its central axis, used for connecting to the heat exchanger connecting pipe 2103. The lower socket fitting 2104 is a socket-type connection component; its upper section inserts into the lower pipe port 2102 of the heat exchanger 210, and its lower section inserts into the heat exchanger connecting pipe 2103. The connection section uses a universal joint structure to compensate for installation alignment, reducing assembly precision requirements, while also minimizing pipe gaps and reducing molten salt bypass. Compared to rigid direct-insertion pipes, this invention eliminates the need for high-precision on-site alignment, significantly improving assembly error tolerance.

[0043] like Figure 3 and Figure 4 As shown, four square openings are evenly distributed circumferentially on the annular sidewall of the base plate support 28 for assembling square channels 281. The square channels 281 are arranged horizontally radially along the base plate support 28, and their main body is a square channel that connects upward to the cylindrical heat exchanger nozzle 2103.

[0044] One end of the square channel 281 near the side wall of the main container 21 is flush with the square opening on the side wall of the bottom plate support 28 without any uneven steps. This flush end face directly corresponds to the molten salt inlet pipe 211, which not only eliminates fluid stagnation dead zones, but also avoids turbulent flow of fuel molten salt flowing out of the molten salt inlet pipe 211, so that the four square channels 281 can obtain a uniform fuel molten salt feed flow rate, ensuring a balanced heat exchange load for the four heat exchangers 210.

[0045] In addition to the molten salt inlet pipe 211 mentioned above, the main container 21 also has a molten salt outlet pipe 212 on its vertical cylindrical wall. For example... Figure 5 As shown, the sidewall of the main vessel 21 has four molten salt inlet holes and four molten salt outlet holes evenly opened along the circumference. The hole positions correspond to the welding of four molten salt inlet pipes 211 and four molten salt outlet pipes 212, respectively. The two types of pipes only serve as communication channels between the heat exchange flow channel inside the heat exchanger 210 and the primary loop pipeline outside the stack.

[0046] Molten salt inlet pipe 213 horizontally penetrates the side wall of the main vessel 21 and is coaxially arranged with molten salt inlet pipe 211. One end of it connects to the external primary loop pipeline, and the other end connects to the internal flow channel of heat exchanger 210 through a square channel 281 at the bottom plate support, introducing the low-temperature primary loop fuel molten salt into the heat exchanger 210 for heat absorption and heating. Molten salt outlet pipe 214 also horizontally penetrates the side wall of the main vessel 21 and is coaxially arranged with molten salt outlet pipe 212. One end of it connects to the internal flow channel of heat exchanger 210 through the top pipeline, and the other end connects to the external primary loop pipeline, exporting the primary loop fuel molten salt that has completed heat absorption and heating in the heat exchanger 210.

[0047] Container Module 2 adopts a factory pre-assembly followed by overall transportation mode. The complete in-factory pre-assembly sequence of Container Module 2 is briefly described below:

[0048] 1) The main container 21 cylinder is positioned and fixed, and the inner wall cleaning inspection is completed;

[0049] 2) Pre-assembled assembly hoisting: The lower chamber graphite 29, bottom plate support 28, and support ring 27 are pre-assembled into an integral structure and hoisted and fixed to the lower head of the main vessel 21; the bottom plate support 28 is pre-assembled with four square channels 281 around its circumference, and the heat exchanger pipe 2103 is integrally formed above the square channels 281.

[0050] 3) Central frame in place: The entire assembly of the cofferdam 23 and the cofferdam assembly base plate 26 is hoisted to the central area of ​​the base plate support 28 to establish the separation benchmark between the core and the outer heat exchange zone;

[0051] 4) External support assembly: The outer support plate 25 of the outer tube is laid circumferentially on the top surface of the support ring 27, and the inner side abuts against the outer wall of the outer tube 23 for limiting;

[0052] 5) Heat exchanger piping alignment and assembly: hoist four heat exchangers 210, and connect the lower pipe port 2102 of the heat exchanger to the heat exchanger connecting pipe 2103 through the lower socket fitting 2104 to complete the piping connection between the heat exchanger and the square channel 281.

[0053] 6) Outer graphite stacking: The outer graphite 22 is stacked in layers on top of the outer support plate 25 of the outer cylinder, and the positioning pins between the layers and between the graphite and the support plate are assembled simultaneously to achieve lateral positioning of the graphite.

[0054] 7) Side reflective layer installation: The side reflective layer 24 is installed as a whole onto the inner wall of the casing 23.

[0055] All internal components are pre-assembled in the factory building in one go. After the pipeline sealing and dimensional accuracy are inspected and qualified, the whole assembly is transported to the nuclear power construction site. Compared with the traditional solution of assembling in stages and piecemeal on the construction site, the construction period of equipment assembly on the nuclear power site is greatly shortened. At the same time, the constant temperature and controllable environment in the factory can improve the alignment and assembly accuracy of square channels, heat exchanger pipelines and graphite structures, and reduce the risk of on-site assembly interference and media leakage.

[0056] like Figure 6 As shown, the graphite core module 3 includes a clamping steel plate 31, a core graphite 32, a clamping band 33, a core base plate 34, a graphite cylindrical pin 35, and a lifting rod 4.

[0057] The graphite 32 in the reactor core is the core component for nuclear fission reaction and heat transfer. It has molten salt channels 321 inside for the flow of molten salt from the primary loop fuel. In this embodiment, the graphite blocks 32 are stacked vertically in five layers. Adjacent layers of graphite blocks are positioned and locked together by interlocking graphite cylindrical pins 35. A pressure plate 31 applies axial constraint to the top layer of graphite blocks. The bottom graphite blocks rest on the support structure 33 and the base 34. The channels 341 of the base and the molten salt channels 321 within the graphite blocks are connected end-to-end, forming a complete molten salt flow path. The graphite cylindrical pins 35 can restrict the lateral displacement of the graphite blocks 32 during core assembly and hoisting, preventing the entire structure from disintegrating. They can also counteract the upward force caused by the buoyancy of the molten salt under high-temperature molten salt conditions, preventing the graphite blocks between layers from separating and becoming misaligned, ensuring the molten salt channels 321 are structurally sound and unobstructed. Compared to the traditional single pressure plate limiting solution, it can simultaneously adapt to three types of working conditions: hoisting and transportation, high temperature buoyancy load, and material thermal expansion deformation, resulting in higher reliability of reactor core operation.

[0058] The core base plate 34 is a hollow circular ring structure. The annular top surface of the ring completely supports the core graphite 32 from below, serving as the bottom support and positioning base for the graphite core module 3. Flow channel openings 341 are evenly distributed circumferentially at the bottom of the ring. The low-temperature primary circuit fuel molten salt enters the cavity above the ring through the flow channel openings 341, and then flows longitudinally upwards into the molten salt flow channel 321 inside the core graphite 32. The bottom of the core graphite 32 and the core base plate 34 are connected, positioned, and constrained by graphite cylindrical pins 35. A clamping band 33 is provided on the outer side of the bottom graphite and the core base plate 34. The clamping band 33 forms a circumferential pre-tightening and reinforcement of the bottom graphite, which counteracts the circumferential expansion trend caused by the thermal expansion of graphite under high temperature conditions, eliminates the gaps caused by the opening of the block, and works with the graphite cylindrical pin 35 to constrain the circumferential, radial and interlayer displacement of the core graphite 32, ensuring the integrity and stability of the overall core structure under high temperature molten salt conditions and avoiding deformation and blockage of the molten salt flow channel.

[0059] The clamping steel plate 31 is pressed onto the top of all the graphite 32 in the reactor core, playing a key role in preventing axial buoyancy. It can continuously counteract the upward buoyancy force generated by the high-temperature molten salt in the reactor core on the entire reactor core, preventing the reactor core from lifting axially and locking the reactor core in the installation reference position within the container module 2. The clamping steel plate alone can only limit the overall buoyancy and cannot restrain the lateral slippage between graphite layers; the graphite cylindrical pin alone can only control the interlayer misalignment, and the bottom graphite still has the risk of radial dispersion. This invention adopts a composite limiting structure of graphite cylindrical pin (full height limit), bottom clamping band 33 (bottom radial reinforcement) and top clamping steel plate 31 (overall axial buoyancy prevention), which coordinates the restraint of the reactor core graphite from three dimensions: interlayer lateral, bottom circumferential, and overall axial, adapting to all working conditions such as hoisting, high-temperature buoyancy, and thermal expansion deformation.

[0060] The graphite core module 3 has multiple vertical hoisting channels pre-reserved along its circumference inside for the installation of hoisting rods 4, such as... Figure 7 As shown in the illustration, this embodiment schematically arranges three lifting rods 4. The number of lifting rods 4 can be flexibly selected according to the module size and lifting load. The lifting rod 4 is a continuous rod, passing sequentially from top to bottom through the clamping steel plate 31, the multi-layer core graphite 32, and the core base plate 34. Threaded holes are machined at corresponding positions on the core base plate 34, and the lower end of the lifting rod 4 is screwed into and locked with the threaded holes. It should be understood that the middle section of the lifting rod 4... Figure 7 The middle section is covered by the graphite core 32, with only the top section protruding above the clamping steel plate 31 and exposed for docking with external hoisting and transfer tools.

[0061] The graphite core module 3 adopts a factory pre-assembly and then overall transportation mode. The complete factory pre-assembly sequence of the graphite core module 3 is briefly described below:

[0062] 1) The core bottom plate 34 is horizontally positioned and fixed, and the bottom flow channel opening 341 is cleaned and inspected.

[0063] 2) The bottom core graphite blocks 32 are stacked in layers on the annular support platform of the core base plate 34, aligned with the positioning holes of the base plate, and the graphite cylindrical pins 35 are inserted so that the bottom end of the pin is inserted and fixed in the core base plate 34.

[0064] 3) Install a clamping band 33 at the outer ring step of the bottom graphite block 32 to pre-tighten the bottom graphite in the circumference and eliminate the gap caused by thermal expansion.

[0065] 4) Stack the middle and upper layers of graphite blocks 32 upwards one by one. Each layer of graphite blocks is connected by a through graphite cylindrical pin 35 to achieve interlayer alignment and locking, ensuring that the molten salt flow channels 321 inside each layer of graphite are precisely aligned vertically.

[0066] 5) After all graphite blocks 32 are stacked to the designed total number of layers, the clamping steel plate 31 is pressed and covered onto the upper surface of the top layer of graphite blocks; the top of the graphite cylindrical pin 35 abuts against the lower surface of the clamping steel plate 31, relying on the clamping steel plate 31 to provide axial preload. There are two types of failure risks under reactor operating conditions: first, the density of graphite material is lower than that of molten salt, causing the core to tend to float upwards due to the buoyancy of the medium; second, graphite undergoes axial contraction after long-term neutron irradiation, resulting in a reduced core height, making it easy for the graphite cylindrical pins and the pin holes of the clamping steel plate to detach, and the interlayer graphite loses its axial constraint. This structure, through the preload design of the graphite cylindrical pins 35 and the clamping steel plate 31 abutting against each other, can simultaneously counteract the core floating tendency caused by the buoyancy of high-temperature molten salt, compensate for the gaps formed by graphite irradiation contraction, and prevent pin hole detachment and graphite interlayer misalignment failures.

[0067] 6) Pass the lifting rod 4 through the pre-reserved lifting channels inside the clamping steel plate 31 and each layer of core graphite 32 from top to bottom, and screw the bottom end of the lifting rod 4 into the threaded hole of the core bottom plate 34 to lock and fix it.

[0068] 7) Perform dimensional remeasurement, flow channel continuity inspection, pin limit reliability test, clamping band preload test, and lifting rod locking reliability test on the overall module;

[0069] 8) After the inspection is qualified, the top of the lifting rod 4 is connected and fixed to the lifting and transfer tooling, the whole set of graphite core module 3 is protected and encapsulated, and the whole is transferred to the assembly station of container module 2. After the module is lowered into place and the accuracy is verified, all lifting rods 4 are rotated out in the opposite direction and removed to complete the core pre-loading into the container.

[0070] like Figure 8 As shown, the integrated top module 1 includes a top structure 11, a start-up system 12, a control rod system 13, a casing support channel 14, a top cover cylinder 15, a molten salt pump chamber 16, a loop pipe section 17, an upper chamber end cap 18, and a pump chamber loop pipe 19.

[0071] The top cover cylinder 15 serves as the main support and mounting base for the integrated stack top module 1. Its upper end is equipped with a flange structure for connecting and fixing the stack top structure 11; its lower end is welded integrally with the upper chamber head 18, together forming the lower cavity of the module. The integrated stack top module 1 is fixed to the main container flange of the container module 2 via the flange on the outside of the top cover cylinder 15, and is erected entirely above the container module 2. The lower structure extends into the interior of the container module 2. (See attached image.) Figure 1 .

[0072] The molten salt pump chamber 16, located in the lower cavity of the module, extends vertically through the top center of the upper chamber head 18. A flange interface 161 is provided at the upper end of the molten salt pump chamber 16 for assembling the primary loop molten salt pump, which is not shown in the attached drawings. The molten salt pump chamber 16 provides installation and operating space for the molten salt pump. When the molten salt pump is operating, it draws the primary loop fuel molten salt, after heat absorption and heating inside the heat exchanger 210, upwards and transports it to the loop pipe section 17, providing a forced driving force for the circulation of the entire primary loop fuel molten salt closed pipeline.

[0073] Within the lower cavity of the module, along the central symmetrical direction of the molten salt pump chamber 16, two loop pipe sections 17 are symmetrically arranged on the outer side of the chamber wall, namely loop pipe section 1 and loop pipe section 2. The specific pipe layout structure is as follows: Figure 9 As shown. Each branch pipe segment 17 further branches into two branch pipe segments, forming a total of four branch pipe segments, each corresponding to one of the four heat exchangers 210 in the lower container module 2, for connecting to the upper pipe 2101 of the heat exchanger 210 (see...). Figure 3 The pump chamber circuit connector 19 is a socket-type connection component. Its upper section is inserted into the lower pipe opening of each branch pipe section, and its lower section is inserted into the upper connector 2101. The connection section uses a universal joint structure to compensate for installation alignment and reduce assembly accuracy requirements. During the overall hoisting and docking of the integrated stack top module 1, the universal joint structure can autonomously adjust its position and angle according to changes in the on-site assembly gaps, ensuring that the pump chamber circuit connector 19 is accurately inserted into the upper connector 2101 of the heat exchanger 210, achieving flow path connectivity. Compared to rigid direct-insertion pipes, the universal adaptive connector of this invention significantly reduces the assembly accuracy requirements for the overall hoisting of the stack top.

[0074] The upper chamber head 18 is provided with a sleeve support channel 14, which is used to neatly arrange and reliably support the control rod system 13, the reactor start-up system 12 and the sleeve structure of the two, so as to ensure that the various equipment are fixed in position and operate reliably under high temperature and vibration conditions.

[0075] The control rod system 13 is the core equipment for reactor reactivity control. By inserting and withdrawing the control rods, it regulates the neutron reaction rate inside the reactor core, thereby enabling functions such as reactor startup, power regulation, normal shutdown, and emergency safety shutdown. The matching control rod sleeve 131 penetrates vertically through the integrated reactor top module 1 and extends into the graphite core module 3 at its lower end. It not only guides the up-and-down reciprocating movement of the control rods but also isolates them from the high-temperature molten salt, protecting the control rod equipment from molten salt corrosion and erosion.

[0076] The reactor start-up system 12 is used during the reactor start-up phase. By introducing a neutron source into the core and supplementing the neutron flux, it enables the reactor to smoothly transition from a subcritical state to a critical state, achieving a safe start-up. The matching start-up system sleeve 121 penetrates vertically through the integrated reactor top module 1 and extends into the graphite core module 3 at its lower end, providing an installation and operation channel for the start-up equipment while isolating the high-temperature molten salt to ensure the stable conduct of the start-up operation.

[0077] The reactor top structure 11 is fixedly installed on the upper flange face of the top cover cylinder 15, and has two core functions: sealing and support. The sealing function relies on the flange connection and matching seals to ensure the overall sealing of the reactor top, prevent leakage of high-temperature molten salt and radioactive media, and maintain stable internal pressure. The support function provides stable installation support for reactor top equipment such as molten salt pumps, control rod system 13, and reactor start-up system 12, while bearing the weight of the module itself and vibration loads during operation, ensuring the safe operation of the equipment.

[0078] The integrated stacker top module 1 adopts a factory pre-assembly and then overall transportation mode. The complete factory pre-assembly sequence of the integrated stacker top module 1 is briefly described below:

[0079] 1) Position the top cover cylinder 15 horizontally using the fixing fixture, and complete the cleaning of the inner wall of the cylinder and the flatness inspection of the upper and lower flanges;

[0080] 2) Hoist the upper chamber head 18 and fully weld it to the lower end of the top cover cylinder 15 with the annular bevel. After the welding is completed, perform non-destructive testing and a water pressure test to form the main body of the lower cavity of the stack top.

[0081] 3) The molten salt pump chamber 16 is assembled in the center position. The molten salt pump chamber 16 vertically penetrates the center opening of the upper chamber head 18 and is welded and sealed. The upper flange interface 161 is finished and the sealing surface is inspected.

[0082] 4) Two branch pipe sections 17 are symmetrically assembled on both sides of the molten salt pump chamber 16. Each branch pipe section 17 branches downwards into two branch pipe sections. After the branch pipe sections are positioned and fixed, the pump chamber circuit connector 19 is pre-installed: the upper section of the pump chamber circuit connector 19 is inserted into the lower pipe port of each branch pipe section. The connector is self-adjusted and aligned by its own universal joint structure to achieve flexible plug-in assembly without rigid welding.

[0083] 5) Install and fix the sleeve support channel 14 at the reserved opening of the upper chamber head 18 to position the sleeve installation benchmark of the control rod and the start-up equipment;

[0084] 6) Install and fix the start-up system sleeve 121 and control rod sleeve 131 in sequence. The two types of sleeves vertically penetrate the top cover cylinder 15 and the upper chamber head 18. They are supported and limited in sections by the sleeve support channel 14 to correct the coaxiality of the sleeves.

[0085] 7) Hoist the top structure 11 and fix it to the upper flange face of the top cover cylinder 15 by flange bolts. Install high temperature sealing gaskets between the flanges to complete the overall sealing assembly of the top.

[0086] 8) Assemble the reactor start-up system 12 and the control rod system 13 onto the upper ends of the reactor start-up sleeve 121 and the control rod sleeve 131 respectively to complete the positioning and fixing of the drive mechanism;

[0087] 9) Module pre-installation performance debugging: Conduct universal compensation stroke test on all pump chamber circuit pipes 19 to verify the adaptive adjustment capability of pipe angle; then carry out overall full-item inspection: pipeline sealing test, sleeve straightness test, flange sealing pressure test, and re-measurement of installation dimensions of each equipment;

[0088] 10) After all the tests and commissioning items are qualified, the module is sealed with dustproof and anti-collision protection and transported to the nuclear power site as a whole. During the on-site hoisting and docking, the lower section of the pump cavity circuit pipe 19 can be adaptively inserted into the upper pipe 2101 of the heat exchanger 210 to complete the complete flow path connection of the fuel molten salt.

[0089] like Figure 10 As shown, the overall workflow of this molten salt reactor is as follows:

[0090] The low-temperature primary fuel molten salt enters the internal flow channel of heat exchanger 210 through the molten salt inlet pipe 211 (blue "molten salt into the reactor" in the figure) on the side wall of the main vessel, and flows sequentially through the lower port 2102 of the heat exchanger, the lower socket pipe fitting 2104, the heat exchanger pipe 2103 and the square channel 281 to the bottom annular flow collection cavity below the core bottom plate 34.

[0091] The cryogenic fuel molten salt collected in the bottom annular collection cavity flows upward from the flow channel opening 341 of the core bottom plate 34 into the molten salt flow channel 321 of the graphite core module 3; the cryogenic fuel molten salt absorbs the heat released by nuclear fission inside the graphite 32 core, heats up to form high temperature fuel molten salt, and flows upward continuously along the vertical red arrow, flowing out from the top of the graphite core module 3.

[0092] The high-temperature fuel molten salt produced from the graphite core module 3 rises vertically along the pinkish-purple pipeline and flows into the integrated top module 1 above through the container module 2. The high-temperature molten salt is collected in the molten salt pump chamber 16 at the center of the top of the reactor. It relies on the built-in molten salt pump to provide the driving force for the circulation of the entire system, and then symmetrically diverts to the loop pipe sections 17 on both sides. The diverted high-temperature fuel molten salt is connected downward to the upper pipe 2101 of the heat exchanger through the pump chamber loop pipe 19, and enters the interlayer of the heat exchanger 210 from top to bottom. Finally, it is discharged from the reactor body from the side wall molten salt outlet pipe 212 (pinkish-purple "molten salt out of the reactor").

[0093] The low-temperature molten salt in the internal flow channel and the high-temperature molten salt in the jacket are both primary loop fuel molten salts. The media are from the same source and are physically isolated and exchange heat only through the metal tube wall of the heat exchanger.

[0094] The four heat exchangers in container module 2 correspond to four fuel molten salt branches that operate synchronously in parallel; the bottom annular collection chamber and the flush square channel structure ensure uniform distribution of the four flow paths, enabling the system to operate continuously and stably.

[0095] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any simple equivalent substitutions, modifications, and alterations made within the inventive concept of the present invention, based on the technical solutions of the present invention, should fall within the scope of protection defined by the claims of the present invention. Structures and assembly processes not described in detail in this specification are conventional and well-known technologies in the art and will not be elaborated further.

Claims

1. An integrated modular molten salt reactor core device, characterized in that, It includes an integrated top module (1), a container module (2), and a graphite core module (3). The graphite core module (3) is arranged in the lower part of the container module (2) for nuclear fission reaction and heat release; The container module (2) is an integral support base, with an integrated heat exchanger (210) inside. The heat exchanger (210) forms a cooling structure for the graphite core module (3) and realizes the primary transfer and distribution of core fission heat. The integrated top module (1) is detachably assembled on the top flange end face of the container module (2). The lower part of the integrated top module (1) extends into the container module (2) and is located above the graphite core module (3). The integrated top module (1) is used to drive the in-core fuel molten salt cycle, regulate the core reaction rate and seal the top cavity of the container module (2). The integrated stack top module (1), container module (2), and graphite core module (3) are independent and prefabricated modular structures that can be transported. The graphite core module (3) can be lifted out individually for overall replacement.

2. The integrated modular molten salt reactor core device according to claim 1, characterized in that, The container module (2) includes a main container (21), an outer graphite (22), a casing (23), a side reflective layer (24), a casing outer support plate (25), a casing assembly bottom plate (26), a support ring (27), a bottom plate support (28), a lower chamber graphite (29), and the heat exchanger (210). The main container (21) is provided with a molten salt inlet pipe (211) and a molten salt outlet pipe (212) on its side wall. The bottom plate support (28), the support ring (27), the outer support plate of the surrounding cylinder (25), the bottom plate of the surrounding cylinder assembly (26) and the lower end cap of the main container (21) form a closed chamber. The interior of the closed chamber is filled with lower chamber graphite (29). The outer graphite (22) and multiple heat exchangers (210) are arranged alternately along the inner wall of the main container (21). The surrounding cylinder (23) is arranged in the hollow area inside the outer graphite (22). A thermal expansion compensation gap is reserved between the surrounding cylinder (23) and the outer graphite (22). A side reflective layer (24) is attached to the inner wall of the surrounding cylinder (23). The lower end of the heat exchanger (210) is connected to the heat exchanger pipe (2103) through a lower socket fitting (2104) with a universal head compensation structure, forming an adaptive flexible docking flow channel structure.

3. The integrated modular molten salt reactor core device according to claim 2, characterized in that, The base plate support (28) has square openings evenly spaced around its annular sidewall, and square channels (281) are fitted inside the square openings. The square channel (281) is arranged horizontally along the radial direction of the base plate support (28). The upper end of the square channel (281) is connected to the heat exchanger pipe (2103). The outer end face of the square channel (281) is flush with the side wall of the base plate support (281) without any steps. The square channel (281) is set opposite to the molten salt inlet pipe (211) to form a molten salt feeding structure with no dead corners and even flow distribution.

4. The integrated modular molten salt reactor core device according to claim 2, characterized in that, The outer graphite (22) is composed of multiple graphite blocks stacked together, and positioning pins are installed between adjacent graphite blocks and between the graphite blocks and the outer support plate (25) of the outer cylinder for limiting. The positioning pins form a horizontal anti-slip and anti-misalignment constraint structure for the multi-layer graphite blocks, suppressing graphite displacement caused by molten salt buoyancy and thermal expansion deformation, and avoiding changes in flow channel gaps and the generation of graphite debris.

5. The integrated modular molten salt reactor core device according to claim 1, characterized in that, The graphite core module (3) includes a clamping steel plate (31), core graphite (32), clamping band (33), core base plate (34), graphite cylindrical pin (35), and lifting rod (4). The core graphite (32) is stacked vertically in multiple layers and has a through molten salt channel (321) inside. The core base plate (34) is a hollow ring structure and has a channel opening (341) that connects with the molten salt channel (321). The graphite cylindrical pin (35) penetrates vertically through each layer of core graphite (32) and is inserted and fixed to the core bottom plate (34). The clamping band (33) is sleeved on the outside of the bottom core graphite (32) to achieve circumferential pre-tightening. The pressing steel plate (31) is pressed on the top of the core graphite (32) to achieve axial limiting. The graphite cylindrical pin (35), clamping band (33), and pressing steel plate (31) work together to form a three-dimensional composite limiting structure with interlayer transverse, bottom circumferential, and overall axial dimensions.

6. The integrated modular molten salt reactor core device according to claim 5, characterized in that, The graphite cylindrical pin (35) is a full-height through-type positioning structure. The graphite cylindrical pin (35) counteracts the buoyancy of molten salt and interlayer shear displacement, and constrains the interlayer misalignment of the multilayer core graphite (32). The clamping band (33) counteracts the thermal expansion stress of the core graphite (32), restricts the radial opening of the bottom graphite, and ensures that the molten salt channel (321) has a regular and connected structure under all working conditions.

7. The integrated modular molten salt reactor core device according to claim 5, characterized in that, The graphite core module (3) also includes a lifting rod (4), which passes through the clamping steel plate (31), the core graphite (32), and is threadedly locked to the core base plate (34).

8. The integrated modular molten salt reactor core device according to claim 7, characterized in that, The upper end of the hoisting rod (4) is exposed on the surface of the clamping steel plate (31) to form a hoisting station. After the hoisting rod (4) is assembled, it can be removed separately without damaging the internal flow channel structure of the reactor core.

9. The integrated modular molten salt reactor core device according to claim 1, characterized in that, The integrated top module (1) includes a top structure (11), a start-up system (12), a control rod system (13), a casing support channel (14), a top cover cylinder (15), a molten salt pump chamber (16), a loop pipe section (17), an upper chamber end cap (18), and a pump chamber loop pipe (19). The molten salt pump chamber (16) vertically penetrates the center of the upper chamber head (18), and the loop pipe section (17) is symmetrically arranged on both sides of the molten salt pump chamber (16). The loop pipe section (17) branches into multiple sets of branch pipe sections. The bottom end of each branch pipe section is adaptively connected to the upper pipe (2101) of the heat exchanger (210) through the pump cavity circuit pipe (19) with universal joint structure, forming a flexible pipe docking structure with multiple angles and deviation compensation. The sleeve support channel (14) provides segmented limiting support for the start-up system sleeve (121) and the control rod sleeve (131). The two types of sleeves vertically penetrate the top module (1) and extend into the graphite core module (3).

10. The integrated modular molten salt reactor core device according to claim 9, characterized in that, The pump chamber circuit connector (19) and the lower socket insert (2104) form a double universal flexible insertion flow channel at the upper and lower ends of the heat exchanger.

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