High-temperature gas cooled reactor nuclear power station

Abstract

The invention discloses a high-temperature gas cooled reactor nuclear power station which comprises a pressure vessel arranged in the center of a nuclear island of the high-temperature gas cooled reactor nuclear power station, the pressure vessel is used for forming a primary loop pressure boundary, and the primary loop pressure boundary is provided with an outer side and an inner side which are opposite to each other, so that sealing of radioactive substances in a reactor is guaranteed, and a safety barrier is formed; a side radiation layer graphite hole channel is formed in the pressure container, a target piece feeding pipe is connected in the side radiation layer graphite hole channel in a sealed mode, the target piece feeding pipe can penetrate through the side radiation layer graphite hole channel and extend out of the outer side and the inner side of a loop pressure boundary in the axial direction of the side radiation layer graphite hole channel, and the target piece feeding pipe is a hollow pipeline with the two ends open; therefore, after the high-temperature gas cooled reactor is started, by arranging the target piece input pipe which is in sealed connection, isotope target pieces can be stored and taken through the target piece input pipe, so that isotope production is carried out through the side radiation layer graphite hole channel, and isotope production is carried out through the idle side radiation layer graphite hole channel; and the use efficiency of the high-temperature gas cooled reactor is improved.

Description

Technical Field

[0001] The present application relates to the technical field of nuclear energy engineering, and more specifically, to a high-temperature gas-cooled reactor nuclear power plant. Background Art

[0002] There are multiple channels inside the core of a high-temperature gas-cooled reactor. After the high-temperature gas-cooled reactor starts up, some channels will be in a long-term idle state. The long-term idle channels occupy the core space, reducing the fuel loading density in the high-temperature gas-cooled reactor and affecting the utilization efficiency of the high-temperature gas-cooled reactor.

[0003] In summary, how to improve the utilization efficiency of a high-temperature gas-cooled reactor is an urgent problem for those skilled in the art at present. Summary of the Invention

[0004] In view of this, the purpose of the present application is to provide a high-temperature gas-cooled reactor nuclear power plant to improve the utilization efficiency of the high-temperature gas-cooled reactor.

[0005] In order to achieve the above purpose, the present application provides the following technical solutions: A high-temperature gas-cooled reactor nuclear power plant includes: a pressure vessel and a side radiation layer graphite channel; wherein, the pressure vessel is arranged inside the center of the nuclear island of the high-temperature gas-cooled reactor nuclear power plant, the pressure vessel is used to form a primary loop pressure boundary, and the primary loop pressure boundary has an outer side and an inner side that are opposite to each other; the side radiation layer graphite channel is arranged on the pressure vessel, a target element input pipe is hermetically connected inside the side radiation layer graphite channel, the target element input pipe penetrates through the side radiation layer graphite channel, and the target element input pipe extends out of the outer side and the inner side of the primary loop pressure boundary along its axial direction respectively; the target element input pipe is a hollow pipe with openings at both ends.

[0006] In some embodiments, the side radiation layer graphite channel includes a neutron source channel; a neutron source pipe is hermetically connected inside the neutron source channel, and the axis of the neutron source channel is consistent with the axis of the neutron source pipe; the neutron source pipe is hermetically welded to the pressure vessel.

[0007] In some embodiments, the neutron source pipe is of an integral structure, the neutron source pipe is hermetically welded inside the neutron source channel, and the neutron source pipe extends out of the inner side and the outer side of the pressure vessel along its axial direction respectively.

[0008] In some embodiments, the neutron source pipe includes a neutron source pipe body and a neutron source extension pipe, the neutron source pipe body is hermetically welded to the outer side of the pressure vessel, and the neutron source extension pipe is hermetically welded to the inner side of the pressure vessel; the axis of the neutron source pipe body, the axis of the neutron source channel, and the axis of the neutron source extension pipe are all consistent.

[0009] In some embodiments, the neutron source tube is provided with a through hole for accessing and storing the target.

[0010] In some embodiments, the graphite channels of the side radiation layer include irradiation supervision channels; an irradiation supervision tube is hermetically connected inside the irradiation supervision channels, and the axis of the irradiation supervision channels is consistent with the axis of the irradiation supervision tube; the irradiation supervision tube is hermetically welded to the pressure vessel.

[0011] In some embodiments, the irradiation supervision tube is of an integral structure, the irradiation supervision tube is hermetically welded inside the irradiation supervision channels, and the irradiation supervision tube extends out of the inner side and the outer side of the pressure vessel along its axial direction respectively.

[0012] In some embodiments, the irradiation supervision tube includes an irradiation supervision tube body and an irradiation supervision extension tube. The irradiation supervision tube body is hermetically welded to the outer side of the pressure vessel, and the irradiation supervision extension tube is hermetically welded to the inner side of the pressure vessel; the axis of the irradiation supervision tube body, the axis of the irradiation supervision channels, and the axis of the irradiation supervision extension tube are all consistent.

[0013] In some embodiments, the irradiation supervision tube is provided with a through hole for accessing and storing the target.

[0014] In some embodiments, the wall thickness of the target input tube is 10 - 20 mm.

[0015] The high-temperature gas-cooled reactor nuclear power plant provided by the present application includes a pressure vessel arranged in the center of the nuclear island of the high-temperature gas-cooled reactor nuclear power plant. The pressure vessel is used to form a primary loop pressure boundary. The primary loop pressure boundary has opposite outer and inner sides to ensure the sealing of radioactive substances in the reactor through the primary loop pressure boundary and form a safety barrier; a side radiation layer graphite channel is arranged inside the pressure vessel, and a target input tube is hermetically connected inside the side radiation layer graphite channel. The target input tube can penetrate through the side radiation layer graphite channel and extend out of the outer side and the inner side of the primary loop pressure boundary along its axial direction respectively, and the target input tube is a hollow pipe with both ends open; thus, after the high-temperature gas-cooled reactor is started, by providing the hermetically connected target input tube, it is possible to access and store the isotope target through the target input tube, so that the side radiation layer graphite channel can produce isotopes. By using the idle side radiation layer graphite channel to produce isotopes, the utilization efficiency of the high-temperature gas-cooled reactor is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the provided drawings.

[0017] Figure 1 It is a schematic diagram of the neutron source channel of a high-temperature gas-cooled reactor nuclear power plant in the prior art; Figure 2 It is a schematic diagram of the irradiation supervision channel of a high-temperature gas-cooled reactor nuclear power plant in the prior art; Figure 3 It is a schematic diagram of the structure of a high-temperature gas-cooled reactor nuclear power plant provided by an embodiment of the present application; Figure 4 It is a schematic diagram of the neutron source input channel provided by an embodiment of the present application; Figure 5 It is a schematic diagram of the irradiation supervision channel provided by an embodiment of the present application.

[0018] Explanation of reference numerals: 1 - Pressure vessel, 2 - Neutron source tube, 3 - Irradiation supervision tube, 4 - Target, 5 - Neutron source channel, 6 - Irradiation supervision channel, 7 - Side radiation layer graphite channel. Detailed implementation manners

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present application in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present application in combination with the drawings in the embodiments of the present application. The terms used in the following embodiments are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and appended claims of the present application, the singular forms "a", "an", "the", "above", "said", "this" are also intended to include, for example, the expression form of "one or more", unless there is a clear opposite indication in the context.

[0021] References to "one embodiment" or "some embodiments" or the like described in this specification mean that a particular feature, structure, or characteristic described in connection with that embodiment is included in one or more embodiments of the present application. Thus, statements such as "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc., which appear in different places in this specification, do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized. The terms "comprising", "including", "having" and their variants mean "including but not limited to", unless otherwise specifically emphasized.

[0022] Requirements for isotope production from a reactor include: a stable high neutron fluence rate and a suitable neutron energy spectrum. For large-scale production of radionuclides, the neutron fluence rate is required to be greater than 10 14 n / s·cm 2 ; it is necessary to have sufficient irradiation space to meet the needs of batch production of radioactive isotopes; it should be able to flexibly load and unload target components and prepare isotopes according to market demand.

[0023] The flux level in the core active region of the existing high-temperature gas-cooled reactor is relatively high (the highest thermal neutron fluence rate is 1.4×10 14 n / cm 2 ·s, and the highest fast neutron (E>0.1 MeV) fluence rate is 5.2×10 13 n / cm 2 ·s), and the radial flux distribution is relatively uniform, which can meet the isotope production requirements; and there are multiple channels inside the core of the existing high-temperature gas-cooled reactor, which are in a long-term idle state after the reactor is started. For example, the neutron source channel and the irradiation supervision channel in the graphite channel of the side radiation layer. As Figure 1 - Figure 2 shown, the existing neutron source channel and the irradiation supervision channel cannot form a sealed channel with the pressure vessel, resulting in the inability to access the isotope target components through the existing neutron source channel and the irradiation supervision channel, making it impossible to carry out isotope production through the existing neutron source channel and the irradiation supervision channel, and reducing the utilization efficiency of the high-temperature gas-cooled reactor.

[0024] The embodiment of the present application provides a high-temperature gas-cooled reactor nuclear power plant to improve the utilization efficiency of the high-temperature gas-cooled reactor.

[0025] As Figure 3As shown in the figure, the high-temperature gas-cooled reactor nuclear power plant provided by the embodiments of the present application includes a pressure vessel 1 and a side radiation layer graphite channel 7. Among them, the pressure vessel 1 is arranged in the center of the nuclear island of the high-temperature gas-cooled reactor nuclear power plant. The pressure vessel 1 is used to form a primary loop pressure boundary. The primary loop pressure boundary has opposite outer and inner sides to ensure the sealing of radioactive substances in the reactor through the primary loop pressure boundary and form a safety barrier. The side radiation layer graphite channel 7 is arranged on the pressure vessel 1. A target component input pipe is hermetically connected in the side radiation layer graphite channel 7. The target component input pipe penetrates through the side radiation layer graphite channel 7, and the target component input pipe extends out of the outer and inner sides of the primary loop pressure boundary along its axial direction. Moreover, the target component input pipe is a hollow pipe with openings at both ends. In this way, after the high-temperature gas-cooled reactor starts, the isotope target components can be accessed through the hermetically connected target component input pipe, so that the side radiation layer graphite channel 7 can produce isotopes. By using the idle side radiation layer graphite channel 7 for isotope production, the utilization efficiency of the high-temperature gas-cooled reactor is improved.

[0026] It should be noted that the isotope target component is a functional component used in a nuclear reactor to produce specific radioactive isotopes. Through neutron irradiation of the target material, a nuclear reaction is induced to generate the target isotope.

[0027] As Figure 4 shown in the figure, the side radiation layer graphite channel 7 includes a neutron source channel 5. A neutron source tube 2 is hermetically connected in the neutron source channel 5. The axis of the neutron source channel 5 is consistent with the axis of the neutron source tube 2, and the neutron source tube 2 is hermetically welded to the pressure vessel 1 to form a sealed channel between the neutron source tube 2 and the pressure vessel 1. Moreover, the neutron source tube 2 is provided with a through hole for accessing the target component 4. In this way, the isotope target component 4 can be accessed through the neutron source tube 2, realizing the production of isotopes by the high-temperature gas-cooled reactor without shutting down the reactor, and improving the utilization rate of the high-temperature gas-cooled reactor.

[0028] It should be noted that during the cold startup process of the reactor, since there are relatively few natural local neutrons in the reactor core, the neutron source channel 5 is needed to provide initial neutron supply to increase the neutron density in the reactor core so that the reactor reaches the critical state. Therefore, after the reactor starts, the neutron source channel 5 is in a long-term idle state.

[0029] In some embodiments, the neutron source tube 2 is of an integral structure. The neutron source tube 2 is hermetically welded inside the neutron source channel 5, and the neutron source tube 2 extends out of the inner and outer sides of the pressure vessel 1 along its axial direction to improve the pressure-bearing capacity of the neutron source tube 2 and the stability of isotope production by the high-temperature gas-cooled reactor.

[0030] In some other embodiments, the neutron source tube 2 includes a neutron source tube body and a neutron source extension tube. The neutron source tube body is hermetically welded to the outside of the pressure vessel 1, and the neutron source extension tube is hermetically welded to the inside of the pressure vessel 1. Moreover, the axes of the neutron source tube body, the neutron source channel 5, and the neutron source extension tube are all the same, which can improve on the original neutron source channel 5 and reduce the impact on the pressure vessel 1.

[0031] In actual situations, such as Figure 1 and Figure 4 As shown, the existing neutron source channel 5 has a flared pipe left inside the pressure vessel 1. Since the flared pipe is disconnected from the pressure vessel 1 and cannot form a sealed channel, isotope production cannot be carried out. During the actual improvement process, the flared pipe can be directly hermetically welded to the inside of the pressure vessel 1 to form a neutron source extension tube, forming a sealed channel with the original neutron source tube 2, enabling the neutron source tube 2 to access the isotope target 4 and realizing isotope production through the neutron source channel 5.

[0032] Such as Figure 5 As shown, the side radiation layer graphite channel 7 includes an irradiation supervision channel 6. An irradiation supervision tube 3 is hermetically connected inside the irradiation supervision channel 6. The axis of the irradiation supervision channel 6 is the same as the axis of the irradiation supervision tube 3, and the irradiation supervision tube 3 is hermetically welded to the pressure vessel 1 to form a sealed channel with the pressure vessel 1 through the irradiation supervision tube 3. Moreover, the irradiation supervision tube 3 is provided with a through hole for accessing the target 4. In this way, the isotope target 4 can be accessed through the irradiation supervision tube 3, realizing the production of isotopes without shutting down the high-temperature gas-cooled reactor and improving the utilization rate of the high-temperature gas-cooled reactor.

[0033] It should be noted that the irradiation supervision channel 6 is a channel in the high-temperature gas-cooled reactor for monitoring the core operation status, evaluating material properties, and ensuring nuclear safety. Therefore, when not being monitored, the irradiation supervision channel 6 is in an idle state.

[0034] In some embodiments, the irradiation supervision tube 3 is of an integral structure. The irradiation supervision tube 3 is hermetically welded inside the irradiation supervision channel 6, and the irradiation supervision tube 3 extends out of the inside and outside of the pressure vessel 1 along its axial direction to improve the pressure-bearing capacity of the irradiation supervision tube 3 and the stability of isotope production in the high-temperature gas-cooled reactor.

[0035] In some other embodiments, the irradiation supervision tube 3 includes an irradiation supervision tube body and an irradiation supervision extension tube. The irradiation supervision tube body is hermetically welded to the outside of the pressure vessel 1, and the irradiation supervision extension tube is hermetically welded to the inside of the pressure vessel 1. Moreover, the axes of the irradiation supervision tube body, the irradiation supervision channel 6, and the irradiation supervision extension tube are all the same, which can improve on the original irradiation supervision channel 6 and reduce the impact on the pressure vessel 1.

[0036] In actual situations, such as Figure 2 and Figure 5 shown, the existing irradiation supervision channels 6 are only distributed on the outer side of the pressure vessel 1 and cannot form a sealed channel with the pressure vessel 1. During the actual improvement process, an irradiation supervision extension pipe can be directly sealed and welded inside the pressure vessel 1 to form a sealed channel with the original irradiation supervision pipe 3, enabling the irradiation supervision pipe 3 to access the isotope target 4 and realizing isotope production through the irradiation supervision pipe 3.

[0037] In order to improve the pressure resistance of the neutron source pipe 2 and the irradiation supervision pipe 3 during isotope production, compared with the original neutron source pipe 2 and irradiation supervision pipe 3, the wall thicknesses of the neutron source pipe 2 and the irradiation supervision pipe 3 provided in the embodiments of the present application are moderately increased, with an increase of 10% - 20% based on the original wall thickness, so that the wall thicknesses of the neutron source pipe 2 and the irradiation supervision pipe 3 are 10 - 20 mm to improve the pressure resistance of the neutron source pipe 2 and the irradiation supervision pipe 3. The specific wall thicknesses of the neutron source pipe 2 and the irradiation supervision pipe 3 can be set according to actual situations, and the embodiments of the present application do not limit this.

[0038] During the operation of the high-temperature gas-cooled reactor nuclear power plant provided in the embodiments of the present application, the isotope target 4 is accessed in the sealed channels formed by the neutron source pipe 2 and the irradiation supervision pipe 3 to realize isotope production through the idle neutron source channels 5 and irradiation supervision channels 6, improving the utilization efficiency of the high-temperature gas-cooled reactor.

[0039] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but rather will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-temperature gas-cooled reactor nuclear power plant, characterized in that, Comprising: A pressure vessel (1) and a side radiation layer graphite channel (7); Wherein, the pressure vessel (1) is arranged inside the center of the nuclear island of a high-temperature gas-cooled reactor nuclear power plant, and the pressure vessel (1) is used to form a primary loop pressure boundary, and the primary loop pressure boundary has an opposite outer side and inner side; The side radiation layer graphite channel (7) is arranged on the pressure vessel (1), a target input tube is hermetically connected inside the side radiation layer graphite channel (7), the target input tube penetrates through the side radiation layer graphite channel (7), and the target input tube extends out of the outer side and the inner side of the primary loop pressure boundary along its axial direction respectively; The target input tube is a hollow pipe with openings at both ends.

2. The high-temperature gas-cooled reactor nuclear power plant according to claim 1, wherein The side radiation layer graphite channel (7) includes a neutron source channel (5); a neutron source tube (2) is hermetically connected inside the neutron source channel (5), and the axis of the neutron source channel (5) is consistent with the axis of the neutron source tube (2); The neutron source tube (2) is hermetically welded to the pressure vessel (1).

3. The high-temperature gas-cooled reactor nuclear power plant according to claim 2, characterized in that, The neutron source tube (2) is of an integral structure, the neutron source tube (2) is hermetically welded inside the neutron source channel (5), and the neutron source tube (2) extends out of the inner side and the outer side of the pressure vessel (1) along its axial direction respectively.

4. The high-temperature gas-cooled reactor nuclear power plant according to claim 2, characterized in that The neutron source tube (2) includes a neutron source tube body and a neutron source extension tube, the neutron source tube body is hermetically welded to the outer side of the pressure vessel (1), and the neutron source extension tube is hermetically welded to the inner side of the pressure vessel (1); The axis of the neutron source tube body, the axis of the neutron source channel (5), and the axis of the neutron source extension tube are all consistent.

5. The high-temperature gas-cooled reactor nuclear power plant according to claim 2, characterized in that, The neutron source tube (2) is provided with a through hole for accessing the target (4).

6. The high-temperature gas-cooled reactor nuclear power plant according to claim 1, characterized in that, The side radiation layer graphite channel (7) includes an irradiation supervision channel (6); an irradiation supervision tube (3) is hermetically connected inside the irradiation supervision channel (6), and the axis of the irradiation supervision channel (6) is consistent with the axis of the irradiation supervision tube (3); The irradiation supervision tube (3) is hermetically welded to the pressure vessel (1).

7. The high-temperature gas-cooled reactor nuclear power plant according to claim 6, characterized in that, The irradiation supervision tube (3) is of an integral structure, the irradiation supervision tube (3) is hermetically welded inside the irradiation supervision channel (6), and the irradiation supervision tube (3) extends out of the inner side and the outer side of the pressure vessel (1) along its axial direction respectively.

8. The high-temperature gas-cooled reactor nuclear power plant according to claim 6, characterized in that, The irradiation supervision tube (3) includes an irradiation supervision tube body and an irradiation supervision extension tube, the irradiation supervision tube body is hermetically welded to the outer side of the pressure vessel (1), and the irradiation supervision extension tube is hermetically welded to the inner side of the pressure vessel (1); The axis of the irradiation supervision tube body, the axis of the irradiation supervision channel (6), and the axis of the irradiation supervision extension tube are all consistent.

9. The high-temperature gas-cooled reactor nuclear power plant according to claim 6, characterized in that, The irradiation supervision tube (3) is provided with a through hole for accessing the target (4).

10. The high-temperature gas-cooled reactor nuclear power plant according to any one of claims 1-9, characterized in that, The wall thickness of the target input tube is 10 - 20 mm.

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