A heavy water reactor conditioning rod for the production of multiple isotopes and materials testing

Abstract

This invention relates to the field of isotope production technology, aiming to solve the problem that existing control rod structures cannot be completely disassembled in a water pool and can only be used for the irradiation production of cobalt isotopes. This invention provides a heavy water reactor control rod for the production and testing of multiple isotopes. The heavy water reactor control rod can be disassembled in the water pool attached to the heavy water reactor nuclear power unit. After disassembly, components for different purposes can be loaded into different transport containers for transport. This invention also provides a method for carrying out the production and testing of multiple isotopes on a heavy water reactor. This invention can realize the production and testing of multiple isotopes.

Description

Technical Field

[0001] This invention relates to the field of isotope production technology, and in particular to a heavy water reactor conditioning rod for the production and testing of multiple isotopes, and a method for carrying out the production and testing of multiple isotopes on a heavy water reactor. Background Technology

[0002] When developing new reactor or aerospace materials, irradiation testing is generally required to verify their performance after irradiation and ensure they meet performance requirements throughout their entire service life. Previously, irradiation testing was typically conducted using research reactors. However, domestic research reactors have heavy workloads, limited operating time, and a limited number of pores, resulting in long waiting times for irradiation testing. The irradiation testing process itself is also time-consuming, leading to excessively long development cycles for new materials and hindering industry progress.

[0003] Therefore, the above two problems can be solved by combining the design characteristics of heavy water reactors. Currently, cobalt-60 is being produced using the control rods of heavy water reactor units. Irradiated targets cannot be disassembled using existing facilities in heavy water reactor units and must be transported off-site as a whole. Overall, the existing solution has the disadvantages of limited production variety, heavy transportation burden, and the limitation that irradiated targets can only be transported as a whole to a single unit.

[0004] The existing regulating rod structure cannot be completely disassembled in the water tank, so it can only be used for the irradiation production of cobalt isotopes. Summary of the Invention

[0005] The main objective of this invention is to provide a heavy water reactor control rod for the production and testing of multiple isotopes. The heavy water reactor control rod of this invention can be disassembled in the pool attached to the heavy water reactor nuclear power unit. After disassembly, the components for different purposes can be loaded into different transport containers for transport, thereby solving the problem that the existing control rod structure cannot be completely disassembled in the pool and can only be used for the irradiation production of cobalt isotopes.

[0006] Another objective of this invention is to provide a method for carrying out the production and testing of multiple isotopes on a heavy water reactor. This method can be equipped with multiple components, each containing a different target material. The components can be disassembled in a pool attached to the heavy water reactor nuclear power unit. After disassembly, the components for different purposes can be loaded into different transport containers and transported off-site, thereby realizing the production and testing of multiple isotopes.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] On one hand, the present invention provides a heavy water reactor regulating rod for the production and testing of various isotopes, comprising a lower end plate, an upper end plate, an intermediate end plate, an element (which is an isotope production element or an irradiation testing element), and a central rod. A plurality of the intermediate end plates are disposed between the lower end plate and the upper end plate, and a central rod passes through and is fixed to the lower end plate, the upper end plate, and the intermediate end plate. The element is disposed between two adjacent end plates, and the element at different positions is respectively equipped with a target for producing different isotopes.

[0009] In some instances, the element can be a solid rod made of isotope production target material or material to be irradiated; it can also be a shell-type element, where the target material inside the shell can be an irradiation production target of multiple isotopes or material to be irradiated.

[0010] In some embodiments, a support tube is sleeved outside the central rod between two adjacent end plates, and the support tube supports the two adjacent end plates.

[0011] In some embodiments, the lower end plate, the upper end plate, and the middle end plate are all provided with a central rod hole, the central rod passes through the central rod hole, one end of the central rod is fixed to the lower end plate, and the other end is fixed to the upper end plate.

[0012] In some embodiments, a lower end plate center rod hole is provided in the middle of the lower end plate, and a set of lower end plate target positioning holes are provided on the upper side. The through hole portion of the lower end plate center rod hole is used to pass through the center rod, and the upper side of the lower end plate center rod hole is a stepped blind hole for installing the support tube.

[0013] In some embodiments, the number of positioning holes of the lower end plate target is 6, and they are evenly arranged circumferentially around the central rod hole of the lower end plate.

[0014] In some embodiments, a center rod hole is provided in the middle of the upper end plate, and a set of target positioning holes are provided on the lower side of the upper end plate. The through hole portion of the center rod hole is used to pass through the center rod, and the lower side of the center rod hole is a stepped blind hole for installing the support tube.

[0015] In some embodiments, a central rod hole is provided in the middle of the intermediate end plate, and a set of target positioning holes are provided on the upper and lower sides of the intermediate end plate. The through hole portion of the central rod hole is used to pass through the central rod, and the upper and lower sides of the central rod hole are stepped blind holes for installing the support tubes at different positions.

[0016] In some embodiments, the central rod includes a steel cable and a rod body, with an upper end and an external thread at the lower part of the rod body.

[0017] In some embodiments, the external threaded connection fixing bolt has a buffer spring disposed between the fixing bolt and the lower end plate.

[0018] On the other hand, the present invention provides a method for carrying out multiple isotope production and material testing on a heavy water reactor, comprising the following steps:

[0019] The upper end plate is placed on the center rod, and then the support tube and a center end plate are placed on the center rod one after the other. The upper end is pushed up, and the target positioning holes of the upper end plate and the center end plate are used to complete the installation of the component (the component is not only the component to be irradiated, but can be a component produced by irradiation of multiple isotopes, or a material to be tested by irradiation; the purpose of this invention is to realize the mixing of multiple materials).

[0020] The support tube and the center end plate are installed in sequence, and the irradiation element is installed and fixed between every two center end plates using the target positioning holes;

[0021] The support tube and lower end plate are installed on the lower external thread (thread end), and the component is installed between the bottom center end plate and the lower end plate using the target positioning hole;

[0022] A buffer spring is installed in the lower part of the lower end plate, and the fixing bolts are installed using the thread at the bottom of the center rod.

[0023] The assembled control rods are then installed into the reactor core during a major overhaul of the heavy water reactor nuclear power unit.

[0024] The core conditioning rods are removed and placed into the fuel pool. The core is then inverted in the pool, the center rod fixing bolts are removed, and the lower end plate, components, middle end plate, components in the middle section, and upper end plate are removed in sequence.

[0025] Different types of isotope production targets or material irradiation targets in irradiation elements are loaded into different containers.

[0026] Compared with existing technologies, the heavy water reactor conditioning rod provided by this invention for the production of various isotopes and material testing has the following beneficial effects:

[0027] The heavy water reactor regulating rod provided by this invention can be disassembled in a water tank and can be used for the production of various isotopes. It can also be used for material irradiation testing.

[0028] Heavy water reactor control rods irradiated with the reactor core can be dismantled in the spent fuel pool of a nuclear power unit and loaded into different containers for transport to different users. This allows commercial heavy water reactor nuclear power units to simultaneously produce multiple types of radioactive isotopes and conduct irradiation tests for new materials required by special industries such as nuclear energy and aerospace, without affecting power generation. This leverages the advantages of long-term stable high-power operation of commercial heavy water reactor units, produces and supplies multiple radioactive isotopes, and can also promote the development and application of new materials in related industries.

[0029] This invention enriches the types of radioactive isotope irradiation production and expands the functions of material irradiation without affecting the stable operation and power generation of commercial heavy water reactor units. Attached Figure Description

[0030] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the technical description will be briefly introduced below.

[0031] Figure 1 A schematic diagram of the structure of a heavy water reactor regulating rod for the production and testing of various isotopes provided by the present invention;

[0032] Figure 2 This is a schematic diagram of the structure of the lower end plate provided by the present invention;

[0033] Figure 3 A front view of the lower end plate provided by the present invention;

[0034] Figure 4 A side view of the lower end plate provided for the present invention, wherein the hole structure is shown in dashed lines;

[0035] Figure 5 This is a schematic diagram of the structure of the upper end plate provided by the present invention;

[0036] Figure 6 A front view of the upper end plate provided by the present invention;

[0037] Figure 7 A side view of the upper plate provided for the present invention, wherein the hole structure is shown in dashed lines;

[0038] Figure 8 This is a schematic diagram of the structure of the intermediate end plate provided by the present invention;

[0039] Figure 9 A front view of the intermediate end plate provided by the present invention;

[0040] Figure 10 A side view of the intermediate end plate provided for the present invention, wherein the hole structure is shown in dashed lines;

[0041] Figure 11 This is a schematic diagram of the structure of the irradiated element provided by the present invention;

[0042] Figure 12 This is a schematic diagram of the structure of the support tube provided by the present invention;

[0043] Figure 13 This is a schematic diagram of the structure of the central rod provided by the present invention.

[0044] Explanation of reference numerals in the attached figures:

[0045] 1. Lower end plate; 11. Center rod hole of lower end plate; 12. Target positioning hole of lower end plate; 2. Upper end plate; 21. Center rod hole of upper end plate; 22. Target positioning hole of upper end plate; 3. Middle end plate; 31. Center rod hole of middle end plate; 32. Target positioning hole of middle end plate; 4. Component; 5. Support tube; 6. Center rod; 61. Steel cable; 62. Rod body; 63. Upper end head; 64. External thread; 7. Adjusting rod; 71. Fixing bolt; 72. Buffer spring. Detailed Implementation

[0046] The following detailed description provides further details on specific implementation methods.

[0047] like Figures 1 to 13 As shown, the present invention provides a heavy water reactor conditioning rod for the production of various isotopes and the testing of materials. The heavy water reactor conditioning rod is a commercially operating heavy water reactor nuclear power unit conditioning rod with a quick-release structure. The target for irradiating isotopes and the material to be tested are included as part of the conditioning rod. The rod is installed in and removed from the reactor core during unit overhaul to complete the neutron irradiation process.

[0048] The heavy water reactor regulating rod is a quick-release structure, comprising a lower end plate 1, an upper end plate 2, a middle end plate 3, an irradiated element 4, a support tube 5, and a central rod 6. Element 4 includes a target for production using various radioactive isotopes or a target made from the material to be tested. This invention can accommodate multiple elements, each containing a different target material.

[0049] like Figures 2 to 4 As shown, the lower end plate 1 is disc-shaped and has a lower end plate center rod hole 11 and a lower end plate target positioning hole 12. The lower end plate center rod hole 11 is opened in the middle of the lower end plate 1, and the lower end plate target positioning hole 12 is opened on the upper side of the lower end plate 1.

[0050] The center rod hole 11 of the lower end plate is a countersunk hole. The through-hole portion of the countersunk hole is used to pass through the center rod 6. The diameter of the through-hole portion is slightly larger than the outer diameter of the center rod 6 but smaller than the outer diameter of the support tube 5. After matching the fixing bolt 71 and the buffer spring 72, it is used for lower end fixation. The upper side of the countersunk hole is a stepped blind hole with a diameter slightly larger than that of the support tube 5 to ensure the supporting function of the support tube 5 and prevent the support tube 5 from passing through the center rod hole 11 of the lower end plate.

[0051] A blind hole is opened on the upper side of the lower end plate 1 as a positioning hole 12 for the lower end plate target component. The diameter of the hole should match the outer diameter of the component 4. The specific number of positioning holes 12 for the lower end plate target component can be adjusted according to actual needs and core conditions. Preferably, the number of positioning holes 12 for the lower end plate target component is 6, and the 6 positioning holes 12 are evenly arranged circumferentially around the central rod hole 11 of the lower end plate. Setting more than three positioning holes 12 for the lower end plate target component ensures stability, but it should not be too dense; setting 6 is more appropriate.

[0052] like Figures 5 to 7 As shown, the upper end plate 2 is disc-shaped and has a center rod hole 21 and a target positioning hole 22. The center rod hole 21 is located in the middle of the upper end plate 2, and the target positioning hole 22 is located on the lower side of the upper end plate 2.

[0053] The center rod hole 21 of the upper end plate is a countersunk hole. The through-hole portion of the countersunk hole is used to pass through the center rod 6. The diameter of the through-hole portion is slightly larger than the outer diameter of the center rod 6, smaller than the outer diameter of the support tube 5, and smaller than the upper end head 63, for upper end fixing. The lower side of the countersunk hole is a stepped blind hole with a diameter slightly larger than the support tube 5 to ensure the supporting function of the support tube 5 and prevent the support tube 5 from passing through the center rod hole 21 of the upper end plate.

[0054] A blind hole is opened on the lower side of the upper end plate 2 as a positioning hole 22 for the upper end plate target component. The diameter of the hole should match the outer diameter of the component 4. The specific number of positioning holes 22 for the upper end plate target component can be adjusted according to actual needs and core conditions. Preferably, the number of positioning holes 22 for the upper end plate target component is 6, and the 6 positioning holes 22 for the upper end plate target component are evenly arranged circumferentially around the central rod hole 21 of the upper end plate.

[0055] like Figures 8 to 10 As shown, the intermediate end plate 3 is disc-shaped and has a central rod hole 31 and a target positioning hole 32. The central rod hole 31 is located in the middle of the intermediate end plate 3, and the target positioning hole 32 is located on both the upper and lower sides of the intermediate end plate 3. The target positioning hole 32 on the upper side corresponds to the target positioning hole 32 on the lower side. The target positioning hole 32 on the upper middle end plate corresponds to the target positioning hole 22 on the upper end plate, allowing the irradiated element 4 to be vertically installed between the two end plates (upper end plate 2 and middle end plate 3); the target positioning hole 32 on the lower middle end plate corresponds to the target positioning hole 12 on the lower end plate, allowing the irradiated element 4 to be vertically installed between the two end plates (middle end plate 3 and lower end plate 1); furthermore, if there are at least two middle end plates 3, the target positioning hole 32 on the upper side of two adjacent middle end plates 3 corresponds to the target positioning hole 32 on the lower side, allowing the irradiated element 4 to be vertically installed between the two end plates (upper middle end plate 3 and lower middle end plate 3). The middle end plate 3 serves as a connecting element between the upper and lower parts, and elements on both sides need to be fixed.

[0056] The center rod hole 31 of the intermediate end plate is a countersunk hole. The through-hole portion of the countersunk hole is used to pass through the center rod 6. The diameter of the through-hole portion is larger than the outer diameter of the center rod 6 but smaller than the outer diameter of the support tube 5. Stepped blind holes are provided on both the upper and lower sides of the countersunk hole. The diameter of the blind holes is slightly larger than that of the support tube 5 to ensure the supporting function of the support tube 5 and prevent the support tube 5 from passing through the target positioning hole 32 of the intermediate end plate.

[0057] Blind holes are opened on both the upper and lower sides of the intermediate end plate 3 as positioning holes 32 for the intermediate end plate target components. The diameter of these holes should match the outer diameter of the component 4. The specific number of positioning holes 32 for the intermediate end plate target components can be adjusted according to actual needs and core conditions. Preferably, the number of positioning holes 32 for the intermediate end plate target components on the upper side is 6, and the number of positioning holes 32 for the intermediate end plate target components on the lower side is 6. The positioning holes 32 for the intermediate end plate target components on the upper side are arranged correspondingly to those on the lower side, and the positioning holes 32 for the target components on adjacent intermediate end plates should be vertically aligned.

[0058] In the heavy water reactor regulating rod of the present invention, a number of intermediate end plates 3 are provided. The number of intermediate end plates 3 is set according to the actual situation, but it is necessary to ensure that the length of the final assembled regulating rod assembly is consistent with the original design value.

[0059] The irradiated element 4 includes a target for radioactive isotope irradiation production or a target made from the material to be tested. If the chemical properties of the material to be irradiated or the target are stable during irradiation, it can be directly made into a solid rod element to receive irradiation; if the material to be irradiated or the target is incompatible with water, it should be made into a rod with an outer zirconium shell and an inner irradiated material, and double zirconium shell can be used if necessary.

[0060] The irradiated element 4 can be a target for producing radioactive isotopes or a material to be irradiated. It can be a solid rod or a zirconium-clad element.

[0061] like Figure 1 and Figure 10 As shown, the irradiated element 4 is an overall slender cylindrical structure. The irradiated element 4 is disposed between the upper end plate target positioning hole 22 and the middle end plate target positioning hole 32, or between two adjacent middle end plates 3 (between the middle end plate target positioning hole 32 on the lower side of the upper middle end plate 3 and the middle end plate target positioning hole 32 on the upper side of the lower middle end plate 3), or between the middle end plate target positioning hole 32 and the lower end plate target positioning hole 12.

[0062] like Figure 1 and Figure 11 As shown, the support tube 5 is a hollow cylindrical structure. The support tube 5 serves as a separator between the end plates (including the upper end plate 2, the middle end plate 3, and the lower end plate 1). The support tube 5 provides support.

[0063] The inner diameter of the support tube 5 is slightly larger than that of the central rod 6, and its thickness should generally be greater than 3 mm. Its length matches that of the element to be irradiated 4. The specific dimensions are determined by design and calculation. The support tube 5 is sleeved on the outside of the central rod 6. The support tube 5 is located between the stepped blind hole 21 of the upper end plate and the stepped blind hole 31 of the middle end plate, or between two adjacent middle end plates 3 (between the stepped blind hole 31 of the middle end plate 3 of the upper middle end plate 3 and the stepped blind hole 31 of the middle end plate 3 of the lower middle end plate 3), or between the stepped blind hole 31 of the middle end plate and the stepped blind hole 11 of the central rod 11 of the lower end plate.

[0064] like Figure 1 and Figure 12 As shown, the central rod 6 includes a steel cable 61 and a rod body 62. The upper part of the rod body 62 is provided with an upper end head 63 (the upper end head serves as a fixation on one side), and the lower part is provided with an external thread 64.

[0065] The upper steel cable 61 is used to hoist the regulating rod. Its diameter is greater than 1 cm, and its length is determined according to its different positions in the reactor core. The specific value is determined by design and calculation during the implementation phase. The steel cable 61 is connected to the upper end.

[0066] The lower part of the center rod 6 is threaded, and it is fixed together with the fixing bolt 71, and an anti-loosening design is required.

[0067] The neutron absorption cross section of the regulating rod needs to be evaluated to ensure that its side reactivity meets the design requirements of heavy water reactor nuclear power units.

[0068] The central rod 6 is a slender rod structure that enters from the upper end plate 2, passes through several intermediate end plates 3, and exits from the lower end plate 1.

[0069] The adjusting rod 7 is an adjusting rod assembly assembled from the above-mentioned components. In addition to the above-mentioned components, it also includes a buffer spring 72 and a fixing bolt 71. The buffer spring 72 is located between the lower end plate 1 and the fixing bolt 71, and the fixing bolt is located at the external thread 64.

[0070] In some embodiments, the above-mentioned structural components (lower end plate 1, upper end plate 2, middle end plate 3, irradiated element 4, support tube 5, and center rod 6) are designed with necessary chamfers to minimize wear.

[0071] In some embodiments, the materials of the above-mentioned structural components are zirconium alloys or other alloy materials with small neutron absorption cross sections and sufficient strength.

[0072] Furthermore, the present invention also provides a method for conducting multiple isotope production and material testing on a heavy water reactor, comprising the following steps:

[0073] First, put the upper end plate 2 on the center rod 6, then put the support tube 5 and a center end plate 3 on the center rod 6 one after another, push the upper end head 63, and at the same time use the target positioning holes of the upper end plate 2 and the center end plate 3 to complete the installation and fixation of the component 4.

[0074] The support tube 5 and the center end plate 3 are installed in sequence. The irradiation element is installed and fixed between every two center end plates 3 using the target positioning holes.

[0075] The support tube 5 and the lower end plate 1 are installed at the lower end (the side with external thread 64). The irradiation element is installed and fixed between the bottom center end plate 3 and the lower end plate 1 using the target positioning hole.

[0076] After the buffer spring 72 is installed in the lower part of the lower end plate 1, the fixing bolt 71 is installed by using the thread at the lower part of the center rod 6, and an anti-loosening design is adopted, thereby completing the assembly of the adjusting rod.

[0077] The assembled control rods are installed into the reactor core during the overhaul of the heavy water reactor nuclear power unit and removed from the core during subsequent overhauls.

[0078] The core conditioning rods are removed and placed into the fuel pool. They are then inverted in the pool, and the center rod 6 fixing bolts 71 are removed. The lower end plate 1, component 4, middle end plate 3, and middle component 4 are then removed in sequence using tools.

[0079] Different types of isotope production targets or material irradiation targets in the irradiation element are loaded into different containers and transported to different external units to complete a batch of irradiation work. Element 4 has the same shape and structure, but can be filled with different target materials.

[0080] This invention enables the production of multiple radioactive isotopes on commercially operating heavy water reactor units, while simultaneously conducting material testing. The irradiated control rods can be dismantled in the spent fuel pool of the heavy water reactor unit, improving production flexibility. During a major overhaul cycle, multiple isotope irradiation production and material testing can be conducted using a commercially operating heavy water reactor unit. The isotope irradiation production target is manufactured by encasing it in a zirconium cladding, and the element to be irradiated is made into a solid element rod.

[0081] Simultaneously, the design is optimized based on its nuclear properties to ensure the overall structural design. Take the center rod 6 of the adjusting rod, insert it into the upper end plate 2, and push it to the upper position of the center rod 6. Then take the support tube 5 and insert it into the center rod 6; then take the middle end plate 3 and insert it into the center rod 6; use the target positioning holes on the upper end plate 2 and the middle end plate 3 to complete the installation of the irradiation element 4; then take the support tube 5 and insert it into the center rod 6; then take the middle end plate 3 and insert it into the center rod 6; use the target positioning holes on two adjacent center end plates 3 to complete the installation of the irradiation element 4; then repeat the installation of the support tube 5, the middle end plate 3, and the irradiation element 4 in sequence; finally, install the lower support tube 5, the lower end plate 1, and the irradiation element 4 into the bottom section. Then install the buffer spring 72 and the anti-loosening fixing bolt 71 at the bottom to complete the assembly of the adjusting rod assembly 7.

[0082] During unit overhaul, the control rod assembly 7 is placed into the reactor core for irradiation until the core is removed during the next unit overhaul.

[0083] In the spent fuel pool of a commercially operating heavy water reactor unit, the irradiated control rod assembly 7 was disassembled. Using underwater tools, the anti-loosening fixing bolts 71, buffer springs 72, and lower end plate 1 were removed sequentially. The last section of the irradiated element 4 was then clamped and placed into different transport shielding containers. Subsequently, the support tube 5 and the intermediate end plate 3 were removed sequentially, and each section of the irradiated element 4 was clamped and placed into different transport shielding containers, completing the disassembly of the irradiated elements and thus the entire irradiation process. The irradiated elements were then transported to different locations for further processing with radioactive isotopes and for studying the properties of the irradiated materials.

[0084] This invention overcomes the limitation of the original structure being unable to be disassembled in a spent fuel pool, and completes the disassembly operation in the power plant pool. Different target components can be placed in different containers and transported to different users, achieving the goal of simultaneously producing multiple isotopes and testing materials through irradiation. Furthermore, without affecting power generation, commercial heavy water reactor nuclear power units can be used to produce various types of reflective isotopes and conduct irradiation tests on new materials required by special industries such as nuclear energy and aerospace.

[0085] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A heavy water reactor conditioning rod for the production of multiple isotopes and material testing, characterized in that, The system includes a lower end plate (1), an upper end plate (2), a middle end plate (3), an element (4), and a central rod (6). Several middle end plates (3) are disposed between the lower end plate (1) and the upper end plate (2). A central rod (6) passes through and is fixed to the lower end plate (1), the upper end plate (2), and the middle end plate (3). The element (4) is disposed between two adjacent end plates. Targets or irradiated materials for producing different isotopes are respectively installed in the element (4) at different positions. A support tube (5) is sleeved on the outside of the central rod (6) between two adjacent end plates, supporting the two adjacent end plates. The lower end plate (1) has an opening in the middle. The lower end plate has a center rod hole (11) and a set of lower end plate target positioning holes (12) on the upper side. The through hole of the lower end plate center rod hole (11) is used to pass through the center rod (6). The upper side of the lower end plate center rod hole (11) is a stepped blind hole for installing the support tube (5). The middle end plate (3) has a middle end plate center rod hole (31) in the middle. A set of middle end plate target positioning holes (32) are opened on the upper and lower sides. The through hole of the middle end plate center rod hole (31) is used to pass through the center rod (6). The upper and lower sides of the middle end plate center rod hole (31) are stepped blind holes for installing the support tube (5) at different positions.

2. The heavy water reactor conditioning rod for the production and testing of multiple isotopes according to claim 1, characterized in that, The lower end plate (1), the upper end plate (2) and the middle end plate (3) are all provided with a central rod hole. The central rod (6) passes through the central rod hole. One end of the central rod (6) is fixed to the lower end plate (1) and the other end is fixed to the upper end plate (2).

3. The heavy water reactor conditioning rod for the production and testing of multiple isotopes according to claim 1, characterized in that, The number of positioning holes (12) of the lower end plate target is 6, and they are evenly arranged circumferentially around the central rod hole (11) of the lower end plate.

4. The heavy water reactor conditioning rod for the production and testing of multiple isotopes according to claim 1, characterized in that, The upper end plate (2) has a center rod hole (21) in the middle and a set of target positioning holes (22) on the lower side. The through hole of the center rod hole (21) is used to pass through the center rod (6). The lower side of the center rod hole (21) is a stepped blind hole for installing the support tube (5).

5. The heavy water reactor conditioning rod for the production and testing of multiple isotopes according to claim 1, characterized in that, The central rod (6) includes a steel cable (61) and a rod body (62). The upper part of the rod body (62) is provided with an upper end (63), and the lower part is provided with an external thread (64).

6. The heavy water reactor conditioning rod for the production and testing of multiple isotopes according to claim 5, characterized in that, The external thread (64) is connected to the fixing bolt (71), and a buffer spring (72) is provided between the fixing bolt (71) and the lower end plate (1).

7. A method for conducting multiple isotope production and materials testing on a heavy water reactor, characterized in that, Includes the following steps: Place the upper end plate (2) onto the center rod (6), then place the support tube (5) and an intermediate end plate (3) onto the center rod (6) one after the other, push the upper end head (63), and at the same time use the target positioning holes of the upper end plate (2) and the intermediate end plate (3) to complete the installation of the component (4); The support tube (5) and the intermediate end plate (3) are installed in sequence, and the component (4) is installed and fixed between every two intermediate end plates (3) using the target positioning holes; The support tube (5) and the lower end plate (1) are installed on the side of the lower external thread (64). The installation of the component (4) is completed between the lower middle end plate (3) and the lower end plate (1) using the target positioning hole. A buffer spring (72) is installed in the lower part of the lower end plate, and the fixing bolt (71) is installed by using the thread at the bottom of the center rod; The assembled regulating rod (7) is installed into the reactor core during the overhaul of the heavy water reactor nuclear power unit; The core adjustment rod (7) is removed and placed into the fuel water pool. It is then turned upside down in the pool, the center rod fixing bolt (71) is removed, and the lower end plate (1), the component (4), the middle end plate (3), the component (4) in the middle part, and the upper end plate (2) are removed in sequence to complete the disassembly. The components (4) for different purposes are placed in different containers.

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