Spent fuel gamma field irradiation system and method for pebble-bed high-temperature gas cooled reactor

Abstract

The invention discloses a spent fuel gamma field irradiation system and method for a pebble-bed high-temperature gas cooled reactor, as gas is arranged around a spent fuel tank, gamma rays cannot be attenuated due to medium absorption, so that an irradiation device can receive gamma rays with higher intensity, and the irradiation efficiency is improved. The spent fuel tank is surrounded by the concrete wall, so that the safety protection for radiation is increased, and the risk of radiation leakage is reduced. By setting the interval between the spent fuel tank and the concrete wall, the size of the irradiation space can be accurately controlled, so that the irradiation effect is optimized. The gamma field irradiation device and method can be used in various research fields, such as radioactive waste treatment, material irradiation modification, nuclear technology application and the like. The dry storage mode reduces the requirement for a cooling system, so that the operation cost can be reduced, and meanwhile, the economic benefit is also improved by efficient irradiation utilization. The radiation pollution to the environment can be reduced by effectively controlling the irradiation space and utilizing the gamma rays.

Description

Technical Field

[0001] The present invention relates to the technical field of gamma ray irradiation fields, and in particular to a gamma field irradiation system and method for spent fuel of a high-temperature gas-cooled reactor. Background Art

[0002] With the development of nuclear energy technology, high-temperature gas-cooled reactors, as an advanced type of reactor, have been widely used in my country. During the operation of a high-temperature gas-cooled reactor, spent fuel will produce a large amount of fission products and radioactive heavy isotopes. These substances will emit gamma rays, thereby forming a strong gamma irradiation field around the spent fuel tank. In the related art, the spent fuel of the pebble bed type high-temperature gas-cooled reactor is stored in a dry manner, and the surrounding area of ​​the spent fuel tank is gas, so that the gamma field will not be greatly attenuated due to dielectric reasons, which provides good conditions for fully utilizing gamma ray irradiation technology. Based on this background, the present invention provides a high-temperature gas-cooled reactor spent fuel gamma field irradiation system and method. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0004] To this end, embodiments of the present invention provide a pebble bed high temperature gas-cooled reactor spent fuel gamma field irradiation system and method.

[0005] The gamma field irradiation system for spent fuel of a pebble bed high-temperature gas-cooled reactor according to an embodiment of the present invention includes a concrete wall, a spent fuel tank, an irradiation device, and an irradiation medium. The concrete wall encloses a spent fuel shaft. The spent fuel tank is arranged in the spent fuel shaft for storing spent fuel produced by the pebble bed high-temperature gas-cooled reactor. The spent fuel tank and the concrete wall are spaced apart to define a gamma field irradiation space. The irradiation device is arranged in the gamma field irradiation space for receiving gamma rays emitted by the spent fuel in the spent fuel tank. The irradiation medium is arranged in the irradiation device for receiving irradiation by gamma rays.

[0006] In some embodiments, the irradiation medium is solid, and the irradiation device is an irradiation shell, which is used to place the solid irradiation medium.

[0007] In some embodiments, the irradiation medium is liquid or gas, the irradiation device is a circulation pipeline, the circulation pipeline is used to place liquid or gaseous irradiation medium, and the circulation pipeline is provided with a circulation pump for driving the circulation of the irradiation medium.

[0008] In some embodiments, a neutron absorption layer is provided on the outer wall surface of the circulation pipeline, and the neutron absorption layer is used to absorb delayed neutrons emitted by the spent fuel.

[0009] In some embodiments, a temperature measuring instrument is provided on the circulation pipeline, and the temperature measuring instrument is used to measure the temperature of the irradiation medium.

[0010] In some embodiments, the circulation pipeline is further provided with a cooler, which is used to cool the irradiation medium. The circulation pipeline is also provided with a storage located between the cooler and the circulation pump, which is used to store the irradiation medium after irradiation.

[0011] In some embodiments, a flow meter and a pressure meter are further provided on the circulation pipeline. The flow meter is used to measure the flow of the irradiation medium, and the pressure meter is used to measure the pressure of the irradiation medium.

[0012] In some embodiments, a gamma field strength measuring instrument is provided in the spent fuel shaft, and the gamma field strength measuring instrument is used to measure the gamma field strength in the spent fuel shaft.

[0013] In some embodiments, the pebble bed type high temperature gas-cooled reactor spent fuel gamma field irradiation system of an embodiment of the present invention includes a controller, which is controlled and connected to the temperature measuring instrument, the flow measuring instrument, the pressure measuring instrument, the gamma field intensity measuring instrument, the cooler and the circulating pump. The controller adjusts the power of the circulating pump and the cooling effect of the cooler according to the detection data of the temperature measuring instrument, the flow measuring instrument, the pressure measuring instrument and the gamma field intensity measuring instrument.

[0014] A gamma field irradiation method for spent fuel of a pebble bed high temperature gas-cooled reactor according to an embodiment of the present invention is applied to the gamma field irradiation system for spent fuel of a pebble bed high temperature gas-cooled reactor described in any of the above embodiments, comprising:

[0015] S1: Place the irradiation device in the spent fuel shaft of the pebble bed high temperature gas-cooled reactor;

[0016] S2: placing the irradiation medium into the irradiation device;

[0017] S3: irradiating the irradiation medium with gamma rays;

[0018] S4: taking out the irradiated medium after irradiation.

[0019] The gamma field irradiation system and method for spent fuel of a pebble-bed high-temperature gas-cooled reactor according to an embodiment of the present invention is capable of receiving gamma rays of higher intensity, thereby improving irradiation efficiency, because the spent fuel tank is surrounded by gas and the gamma rays are not attenuated by dielectric absorption. The spent fuel tank is surrounded by concrete walls, which increases radiation safety protection and reduces the risk of radiation leakage. By setting the spacing between the spent fuel tank and the concrete wall, the size of the irradiation space can be precisely controlled, thereby optimizing the irradiation effect. This gamma field irradiation device and method can be used in a variety of research fields, such as radioactive waste treatment, material irradiation modification, and nuclear technology applications. The dry storage method reduces the demand for the cooling system, which can reduce operating costs. At the same time, the efficient irradiation utilization also improves economic benefits. By effectively controlling the irradiation space and utilizing gamma rays, radiation pollution to the environment can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a pebble bed high temperature gas-cooled reactor spent fuel gamma field irradiation system according to an embodiment of the present invention.

[0021] Figure 2 It is a schematic diagram of a pebble bed high temperature gas-cooled reactor spent fuel gamma field irradiation system according to an embodiment of the present invention.

[0022] Figure 3 The present invention is a flowchart of a method for γ-field irradiation of spent fuel of a pebble bed high-temperature gas-cooled reactor according to an embodiment of the present invention.

[0023] Reference numerals:

[0024] 1. Concrete wall; 2. Spent fuel tank; 3. Gamma field irradiation space; 4. Irradiation device; 5. Circulation pump; 6. Temperature measuring instrument; 7. Cooler; 8. Storage; 9. Flow measuring instrument; 10. Pressure measuring instrument; 11. Gamma field intensity measuring instrument; 12. Controller. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0026] like Figures 1 to 3As shown, the gamma field irradiation system for spent fuel of a pebble bed high temperature gas-cooled reactor according to an embodiment of the present invention includes a concrete wall 1, a spent fuel tank 2, an irradiation device 4, and an irradiation medium. The concrete wall 1 encloses a spent fuel shaft, and the spent fuel tank 2 is disposed in the spent fuel shaft for storing spent fuel produced by the pebble bed high temperature gas-cooled reactor. The spent fuel tank 2 and the concrete wall 1 are spaced apart to define a gamma field irradiation space 3; the irradiation device 4 is disposed in the gamma field irradiation space 3 for receiving gamma rays emitted by the spent fuel in the spent fuel tank 2. The irradiation medium is disposed in the irradiation device 4 for receiving irradiation by gamma rays.

[0027] The spent fuel produced by the pebble bed high temperature gas-cooled reactor is stored in a spent fuel canister 2, which is placed in a spent fuel shaft enclosed by a concrete wall 1. The main function of the concrete wall 1 is to provide safety protection and prevent radiation leakage. There is a certain distance between the spent fuel canister 2 and the concrete wall 1, and this distance area defines the gamma field irradiation space 3. Since the surrounding area of ​​the spent fuel canister 2 is gas, the gamma rays in this space will not be greatly attenuated due to absorption by the medium (such as water or other substances), thereby ensuring the high intensity of the gamma rays. The irradiation device 4 is placed in the gamma field irradiation space 3, and its function is to receive the gamma rays emitted by the spent fuel in the spent fuel canister 2. The irradiation medium exists inside the irradiation device 4 and is used to receive irradiation by gamma rays. The irradiation medium can be a specific material that can interact with gamma rays to achieve a specific irradiation effect.

[0028] In the pebble-bed high-temperature gas-cooled reactor spent fuel gamma field irradiation system of an embodiment of the present invention, since the spent fuel tank 2 is surrounded by gas, the gamma rays will not be attenuated due to medium absorption, so the irradiation device 4 can receive higher-intensity gamma rays, thereby improving the irradiation efficiency. The spent fuel tank 2 is surrounded by a concrete wall 1, which increases the safety protection against radiation and reduces the risk of radiation leakage. By setting the interval between the spent fuel tank 2 and the concrete wall 1, the size of the irradiation space can be precisely controlled, thereby optimizing the irradiation effect. This gamma field irradiation device 4 and method can be used in a variety of research fields, such as radioactive waste treatment, material irradiation modification, and nuclear technology applications. The dry storage method reduces the demand for the cooling system, which can reduce operating costs. At the same time, efficient irradiation utilization also improves economic benefits. By effectively controlling the irradiation space and utilizing gamma rays, radiation pollution to the environment can be reduced.

[0029] In some embodiments, the irradiation medium is solid, and the irradiation device 4 is an irradiation shell, which is used to place the solid irradiation medium.

[0030] like Figure 1As shown, the solid irradiation medium is fixed inside the irradiation shell, which can provide better structural stability and prevent the medium from moving or changing position due to the action of radiation during the irradiation process. Solid media can generally absorb and utilize gamma rays more efficiently. They can be designed into different shapes and sizes as needed to maximize the interaction with gamma rays. The irradiation shell can be designed with a material that can resist radiation damage, thereby maintaining its structural integrity during long-term irradiation and ensuring that the irradiated medium does not leak into the environment. The irradiation shell can be designed with a structure that is easy to open and close, so that the irradiated medium can be easily replaced or maintained. After the irradiation of the irradiated medium is completed, the batch of irradiated media is removed and the next batch of irradiation is carried out.

[0031] In other embodiments, the irradiation medium is liquid or gas, and the irradiation device 4 is a circulation pipeline. The circulation pipeline is used to place the liquid or gaseous irradiation medium, and a circulation pump 5 is provided on the circulation pipeline for driving the circulation of the irradiation medium.

[0032] For example, the liquid irradiation sample can be glycerol, or other types of irradiation samples depending on market demand. The very valuable fuel additive glycerol acetone acetal can be produced by gamma field irradiation catalysis of spent fuel elements of pebble bed high temperature gas-cooled reactors.

[0033] It should be noted that the inner wall of the circulation pipeline must be compatible with the irradiation medium and no chemical reaction can occur. Figure 2 As shown, the design of the circulation piping and circulation pump 5 enables continuous circulation of the irradiation medium, improving gamma ray utilization and irradiation efficiency. The flow of liquid or gaseous irradiation medium in the circulation piping helps achieve uniform distribution of gamma rays within the irradiation medium, thereby providing a more uniform irradiation effect. Liquids generally have good heat capacity and can absorb and transfer large amounts of heat, which helps control the temperature during the irradiation process. Different chemical substances can be selected as irradiation media to suit different irradiation requirements and reaction characteristics. The low fluidity and compressibility of liquids facilitate maintaining a stable circulation state.

[0034] In some embodiments, a neutron absorption layer is provided on the outer wall surface of the circulation pipeline, and the neutron absorption layer is used to absorb delayed neutrons emitted by the spent fuel.

[0035] Spent fuel emits delayed neutrons during its decay process. If these neutrons are not absorbed, they can trigger unnecessary chain fission reactions, increasing radiation levels and safety risks. Neutron absorbers effectively absorb these delayed neutrons and reduce their circulation in the system. By installing neutron absorbers on the outer walls of the circulation piping, the radiation impact of neutrons on the surrounding environment and equipment can be reduced, improving workplace safety. Neutron absorbers act as an additional barrier to prevent neutrons from escaping the circulation piping, making this design particularly important in areas of high radiation.

[0036] Neutron-absorbing layers can be made of materials with strong neutron absorption capabilities, such as boron, cadmium, and lithium, which effectively absorb both thermal and fast neutrons. They can be tightly integrated with the outer wall of the circulation piping or designed as a separately replaceable layered structure for ease of maintenance and replacement.

[0037] In some embodiments, a temperature measuring instrument 6 is provided on the circulation pipeline, and the temperature measuring instrument 6 is used to measure the temperature of the irradiated medium.

[0038] Due to the decay heat of spent fuel elements, the temperature around the gamma irradiation field is high, generally higher than room temperature, so it is necessary to measure the temperature of the irradiated medium with a temperature measuring instrument 6. In addition, the temperature measuring instrument 6 needs to work in a gamma environment for a long time, so it is necessary to use a radiation-resistant thermocouple.

[0039] like Figure 2 As shown, through continuous monitoring, operators can ensure that the temperature of the irradiated medium remains within a safe and effective range. The heat generated during the irradiation process needs to be effectively managed. The data provided by the temperature measuring instrument 6 can help control the cooling or heating system in the circulation pipeline to keep the irradiated medium operating at optimal temperature conditions. Excessive temperatures may cause changes in the chemical properties of the irradiated medium and may even damage the circulation pipeline and related equipment. The temperature measuring instrument 6 can issue a timely alarm to prevent this from happening. In some applications, the temperature of the irradiated medium directly affects the irradiation effect and reaction rate. Through precise temperature control, the uniformity and efficiency of irradiation can be improved.

[0040] The temperature measuring instrument 6 can be a thermocouple, a thermistor, an infrared thermometer or other temperature sensors suitable for working in an irradiation environment. The temperature measuring instrument 6 is usually installed at multiple locations in the circulation pipeline so that the temperature of different areas can be monitored to ensure that the temperature distribution of the entire system is uniform. The temperature measuring instrument 6 needs to have high precision to provide accurate data, which is crucial for irradiation process control. The temperature measuring instrument 6 can be linked with the safety system. When a temperature anomaly is detected, the early warning mechanism is automatically triggered and measures are taken to reduce the temperature to ensure system safety. By integrating the temperature measuring instrument 6 on the circulation pipeline, the safety and reliability of the nuclear reactor spent fuel gamma field irradiation system can be significantly improved, while optimizing the irradiation process, improving the irradiation effect and overall economy.

[0041] In some embodiments, a cooler 7 is further provided on the circulation pipeline, and the cooler 7 is used to cool the irradiation medium. A storage 8 is also provided on the circulation pipeline, located between the cooler 7 and the circulation pump 5, and the storage 8 is used to store the irradiated medium after irradiation.

[0042] like Figure 2As shown, the cooler 7 reduces the temperature of the irradiated medium by absorbing the heat in the irradiated medium, ensuring that the irradiated medium remains within a suitable operating temperature range during the entire cycle. A large amount of heat may be generated during the irradiation process, and the cooler 7 can prevent the irradiated medium and system equipment from being damaged due to overheating. The cooler 7 helps to manage the heat generated in the system and can adapt to different irradiation requirements by adjusting the cooling efficiency. The cooler 7 can adopt water cooling, air cooling or other types of cooling methods, and is designed according to the properties of the irradiated medium and the heat load of the system. The efficiency of the cooler 7 needs to meet the requirements of the system heat dissipation to ensure the temperature stability of the irradiated medium during the cycle.

[0043] Storage 8 provides a temporary storage location for irradiated media that may have absorbed the radiation energy of the radioactive material. Storage 8 serves as a safety barrier, preventing the spread of radioactive effects before the irradiated media is further processed or disposed of. Storage 8 increases system flexibility, allowing for management of irradiated media during different operational phases, such as replacement or equipment maintenance. Storage 8 must have sufficient capacity to store a given amount of irradiated media and consider radiation protection measures, such as using a certain thickness of shielding material.

[0044] In some embodiments, a flow meter 9 and a pressure meter 10 are further provided on the circulation pipeline. The flow meter 9 is used to measure the flow of the irradiated medium, and the pressure meter 10 is used to measure the pressure of the irradiated medium.

[0045] Flow meter 9 monitors the flow rate of the irradiated medium in real time, ensuring that the flow rate of the medium in the circulation system meets the design requirements to achieve the desired irradiation effect. Based on this flow data, the operating status of the circulation pump 5 can be adjusted to optimize the circulation efficiency of the medium and improve irradiation uniformity. Flow meter 9 can also help detect abnormalities such as leaks and blockages in the system, providing timely alarms.

[0046] The pressure gauge 10 monitors pressure within the circulation system, ensuring it operates within a safe range and preventing equipment damage caused by excessive or insufficient pressure. By monitoring the pressure differential at different locations, it can determine any imbalances within the system and make timely adjustments to ensure system balance. The pressure gauge 10 can also serve as a safety monitoring tool, triggering safety mechanisms to prevent accidents when abnormal pressure is detected.

[0047] The flow meter 9 can utilize technologies such as electromagnetic flowmeters, ultrasonic flowmeters, and vortex flowmeters, selecting the most appropriate measurement method based on the properties of the irradiated medium. The pressure meter 10 can utilize a mechanical pressure gauge, an electronic pressure sensor, or the like, capable of accurately measuring and displaying pressure readings in real time. Data from the flow meter 9 and pressure meter 10 can be integrated into the system's data acquisition and control system for automated monitoring and adjustment. The flow and pressure meters 10 must be able to withstand the effects of the irradiation environment and maintain long-term stability and reliability. Flow and pressure data can be displayed on a real-time monitoring interface, allowing operators to monitor in real time and quickly respond to potential system issues.

[0048] In some embodiments, a gamma field intensity measuring instrument 11 is provided in the spent fuel shaft, and the gamma field intensity measuring instrument 11 is used to measure the gamma field intensity in the spent fuel shaft.

[0049] The gamma field intensity meter 11 monitors the gamma ray intensity within the spent fuel shaft in real time, which is crucial for preventing excessive radiation exposure to workers and equipment. By monitoring the gamma field intensity, operating parameters of the irradiation system, such as the flow rate of the circulating medium and the cooling efficiency of the cooler 7, can be adjusted to ensure safe operation. The gamma field intensity meter 11 can also be used to calibrate other radiation monitoring equipment in the irradiation system, ensuring the effectiveness of the radiation safety control measures throughout the system.

[0050] The gamma field intensity meter 11 must be highly precise to provide accurate gamma ray intensity data, which is crucial for safety control and assessment of irradiation effects. The meter's design must account for the range of gamma ray intensities expected within the spent fuel shaft, ensuring it covers intensity levels under all operating conditions. Because gamma rays are harmful to the human body, the meter must incorporate robust radiation shielding measures to protect the equipment from damage and minimize radiation exposure to operators. The meter can be connected to a data acquisition system to enable real-time data transmission and analysis, facilitating remote monitoring and management.

[0051] By integrating a gamma field intensity meter11 within the spent fuel shaft, real-time data on the radiation safety status of the irradiation system can be provided, enabling operators to respond promptly and ensuring the safety and effectiveness of nuclear energy utilization. Furthermore, this design provides a scientific basis for optimizing irradiation system performance and developing radiation protection strategies.

[0052] In some embodiments, the pebble bed type high temperature gas-cooled reactor spent fuel gamma field irradiation system of an embodiment of the present invention includes a controller 12, which is controlled and connected to the temperature measuring instrument 6, the flow measuring instrument 9, the pressure measuring instrument 10, the gamma field intensity measuring instrument 11, the cooler 7 and the circulating pump 5. The controller 12 adjusts the power of the circulating pump 5 and the cooling effect of the cooler 7 according to the detection data of the temperature measuring instrument 6, the flow measuring instrument 9, the pressure measuring instrument 10 and the gamma field intensity measuring instrument 11.

[0053] Based on the detection data received from the temperature meter 6, flow meter 9, pressure meter 10, and gamma field intensity meter 11, the controller 12 automatically adjusts the power of the circulation pump 5 and the cooling efficiency of the cooler 7 to maintain optimal system operation. Through real-time monitoring and automatic adjustment, the controller 12 ensures that the irradiation system remains within safe operating parameters at all times, preventing potential risks caused by temperature, pressure, flow rate, or gamma field intensity exceeding safety limits. The controller 12 can optimize the flow of the circulating medium and cooling efficiency based on different irradiation requirements, improving irradiation uniformity and efficiency. When an abnormal system parameter is detected, the controller 12 automatically triggers an early warning mechanism and takes appropriate measures, such as reducing the power of the circulation pump 5, increasing cooling efficiency, or shutting down the system to prevent the fault from escalating. The controller 12 can also record system operating data for subsequent analysis and optimization of system design. This data can also be used for safety assessment and performance monitoring. The controller 12 can connect to an external monitoring center via a remote interface, enabling remote operation and monitoring, thereby improving system availability and flexibility. The integrated connection between the controller 12 and the circulation pump 5, cooler 7 and other monitoring equipment can ensure that the various parts of the system work together to improve the overall performance of the system.

[0054] By integrating the controller 12 into the pebble bed high temperature gas-cooled reactor spent fuel gamma field irradiation system, a highly automated control system can be realized, which improves the safety and efficiency of the irradiation system, simplifies the operating process, and reduces the risk of human error, which is of great significance to the safe and efficient use of nuclear energy.

[0055] The gamma field irradiation method for spent fuel of a pebble bed high temperature gas-cooled reactor according to an embodiment of the present invention is applied to the gamma field irradiation system for spent fuel of a pebble bed high temperature gas-cooled reactor according to any of the above embodiments, comprising:

[0056] S1: Placing an irradiation device 4 in the spent fuel shaft of a pebble bed high temperature gas-cooled reactor;

[0057] S2: placing the irradiation medium into the irradiation device 4;

[0058] S3: irradiating the irradiation medium with gamma rays;

[0059] S4: taking out the irradiated medium after irradiation.

[0060] S1: Place the irradiation device 4 in the spent fuel shaft of the pebble bed high temperature gas-cooled reactor.

[0061] This step is the beginning of the entire process, ensuring that the irradiation device 4 is located in the gamma field irradiation space 3 so as to be able to effectively receive and utilize the gamma rays emitted by the spent fuel tank 2 .

[0062] S2: Place the irradiation medium into the irradiation device 4.

[0063] The irradiation medium can be solid, liquid or gaseous. The appropriate medium is selected according to the specific design and irradiation requirements. The irradiation medium is placed in the device and exposed to gamma rays.

[0064] S3: Gamma irradiation of the irradiated medium

[0065] The irradiation device 4 receives the gamma rays, and the irradiated medium undergoes physical or chemical changes under the irradiation of the gamma rays. This process can be continuous or carried out according to a set irradiation dose.

[0066] S4: taking out the irradiated medium after irradiation.

[0067] When the irradiation process is complete, the irradiated medium is removed and may have undergone the desired changes, ready for further processing, analysis, or application.

[0068] The entire process must be conducted under strict radiation protection measures to protect operators and the environment from the effects of radiation. The design of the irradiator 4 and the selection of the irradiation medium must be optimized to maximize the efficiency of gamma ray utilization and minimize unnecessary energy loss. The entire irradiation process must be precisely controlled, including the temperature, flow rate, pressure, and gamma field intensity of the irradiation medium, to ensure consistent and reliable irradiation results.

[0069] Through the above method, the gamma rays produced by spent fuel can be effectively utilized, which not only helps in the treatment of radioactive waste, but also may promote the development of nuclear technology in medicine, industry and other fields.

[0070] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0071] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0072] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection, or communication; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0073] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0074] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples without contradiction.

[0075] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A pebble bed high temperature gas-cooled reactor spent fuel gamma field irradiation system, characterized in that: include: a concrete wall, wherein the concrete wall encloses a spent fuel shaft; a spent fuel tank, the spent fuel tank being arranged in the spent fuel shaft for storing spent fuel produced by a pebble bed high temperature gas-cooled reactor, the spent fuel tank being spaced apart from the concrete wall to define a gamma field irradiation space; an irradiation device, the irradiation device being arranged in the gamma field irradiation space and being used for receiving gamma rays emitted by the spent fuel in the spent fuel tank; An irradiation medium is provided in the irradiation device and is used for receiving irradiation by gamma rays.

2. The pebble bed type high temperature gas-cooled reactor spent fuel gamma field irradiation system according to claim 1, characterized in that: The irradiation medium is solid, the irradiation device is an irradiation shell, and the irradiation shell is used to place the solid irradiation medium.

3. The pebble bed high temperature gas-cooled reactor spent fuel gamma field irradiation system according to claim 1, characterized in that: The irradiation medium is liquid or gas, the irradiation device is a circulation pipeline, the circulation pipeline is used to place the liquid or gaseous irradiation medium, and the circulation pipeline is provided with a circulation pump for driving the circulation of the irradiation medium.

4. The pebble bed type high temperature gas-cooled reactor spent fuel gamma field irradiation system according to claim 3, characterized in that: A neutron absorption layer is provided on the outer wall surface of the circulation pipeline, and the neutron absorption layer is used to absorb delayed neutrons emitted by the spent fuel.

5. The pebble bed type high temperature gas-cooled reactor spent fuel gamma field irradiation system according to claim 3, characterized in that: A temperature measuring instrument is provided on the circulation pipeline, and the temperature measuring instrument is used to measure the temperature of the irradiated medium.

6. The pebble bed high temperature gas-cooled reactor spent fuel gamma field irradiation system according to claim 5, characterized in that: The circulation pipeline is further provided with a cooler, which is used to cool the irradiation medium. The circulation pipeline is also provided with a storage located between the cooler and the circulation pump, which is used to store the irradiation medium after irradiation.

7. The pebble bed type high temperature gas-cooled reactor spent fuel gamma field irradiation system according to claim 6, characterized in that: The circulation pipeline is further provided with a flow meter and a pressure meter. The flow meter is used to measure the flow of the irradiated medium, and the pressure meter is used to measure the pressure of the irradiated medium.

8. The pebble bed type high temperature gas-cooled reactor spent fuel gamma field irradiation system according to claim 7, characterized in that: A gamma field intensity measuring instrument is provided in the spent fuel shaft, and the gamma field intensity measuring instrument is used to measure the gamma field intensity in the spent fuel shaft.

9. The pebble bed type high temperature gas-cooled reactor spent fuel gamma field irradiation system according to claim 8, characterized in that: The invention comprises a controller, which is controlled and connected with the temperature measuring instrument, the flow measuring instrument, the pressure measuring instrument, the gamma field intensity measuring instrument, the cooler and the circulation pump. The controller adjusts the power of the circulation pump and the cooling effect of the cooler according to the detection data of the temperature measuring instrument, the flow measuring instrument, the pressure measuring instrument and the gamma field intensity measuring instrument.

10. A method for gamma field irradiation of spent fuel of a pebble bed high temperature gas-cooled reactor, the method being applied to the gamma field irradiation system for spent fuel of a pebble bed high temperature gas-cooled reactor according to any one of claims 1 to 9, characterized in that: include: S1: Place the irradiation device in the spent fuel shaft of the pebble bed high temperature gas-cooled reactor; S2: placing the irradiation medium into the irradiation device; S3: irradiating the irradiation medium with gamma rays; S4: taking out the irradiated medium after irradiation.

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