A medium circulation radiation heating resistance test system and method

Abstract

The present invention discloses a medium circulation type radiation resistance heating test system and method, which avoids the influence of traditional heating methods on the detector electrical signal; avoids the problem of local overheating during the heating process, and at the same time avoids the influence of external high temperature on the reactor core, thereby realizing the development of detectors adapted to the heat pipe reactor environment; the technical solution includes a test device, a standard detector, a heating device, and a data acquisition system; the detector power supply is used to power the standard detector and the detector to be identified; the data acquisition system is respectively connected to the standard detector, pump and heating device; the pump, heating device, data acquisition system and detector power supply are all arranged in the shielding structure.

Description

Technical Field

[0001] The present invention belongs to the technical field of nuclear power plant detectors, and in particular relates to a medium circulation type radiation heating resistance test system and method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] As a type of microreactor, the heat pipe micro-reactor transfers the heat generated by the reactor core to the nuclear thermal propulsion system or thermoelectric conversion device through the evaporation, condensation and natural circulation of the working fluid inside the heat pipe. Therefore, the reactor is solid-state and does not require traditional primary-loop equipment. The overall structure is simpler and more compact, making it easier to transport and store. At the same time, the heat pipe micro-reactor passively removes the heat from the core. In addition, the heat pipes are independent of each other. Even in the event of partial failure of a single heat pipe, the surrounding heat pipes will still work normally, which can effectively avoid serious accidents.

[0004] However, heat pipe reactors are miniaturized and solid-state. In order to obtain a sufficiently large neutron injection rate in the extra-pile nuclear measurement system, the extra-pile detectors need to be close to the reactor core, which makes the ambient temperature of the extra-pile detectors particularly high (often higher than 150°C). As a result, traditional standard detectors cannot adapt to the environment of heat pipe reactors, and there are no directly applicable products on the market. It is necessary to develop test equipment suitable for high-temperature resistant detectors. Summary of the Invention

[0005] In response to the above problems, the present invention provides a medium-circulating radiation-resistant heating test system and method, which conducts heat through a high-boiling-point flowing medium, avoiding the impact of traditional heating methods on the detector's electrical signals; uniform large-scale heating is achieved through temperature sensors, data acquisition systems and spiral flow channels in the interlayer, avoiding local overheating problems during the heating process, and at the same time avoiding the impact of external high temperatures on the reactor core, thereby realizing the development of detectors that adapt to the heat pipe reactor environment.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] In a first aspect, the present invention provides a medium circulation type radiation resistance heating test system, comprising a test apparatus, a standard detector, a reactor core, a shielding structure, a pump, a heating device, a data acquisition system, and a detector power supply;

[0008] The test device also includes an inner sleeve, an interlayer, an outer sleeve, and an inner flow channel of the interlayer; the inner sleeve is used to place the detector to be identified, and temperature sensors are evenly distributed on the inner side surface of the inner sleeve. The outer side of the inner sleeve is provided with the interlayer, and the inner flow channel of the interlayer is provided in the interlayer. The outer sleeve is provided with the outer side of the interlayer; a detector positioning structure is provided at the inner bottom of the inner sleeve, and the detector positioning structure is fixedly connected to the inner sleeve and is used to limit the movement of the detector to be identified to a deeper depth to achieve a positioning function;

[0009] The detector power supply is used to power the standard detector and the detector to be identified in the test device; the data acquisition system is used to collect and compare data from the standard detector, the detector to be identified and the temperature sensor. The data acquisition system is also connected to the pump and the heating device respectively to control the flow rate of the pump and the opening and closing of the heating device; the pump, heating device, data acquisition system and detector power supply are all arranged in the shielding structure.

[0010] Furthermore, a flow channel sealing adapter is provided on the outer sleeve, and the flow channel sealing adapter is communicated with the flow channel in the interlayer.

[0011] Furthermore, a plurality of interlayer flow channels are evenly arranged in the interlayer, and the inlet and outlet of each interlayer flow channel are connected to the flow channel sealing adapter.

[0012] Furthermore, the detector power supply is connected to the standard detector via a cable, and the cable is a radiation-resistant cable with radiation resistance. The cable is also used to connect the detector power supply and the detector to be identified.

[0013] Furthermore, the data acquisition system is connected to the standard detector and the heating coil power supply via the cable, and the cable is also used to connect the data acquisition system and the detector to be identified.

[0014] Furthermore, the pump is connected to the heating device through an external high-temperature medium pipeline, and the heating device is connected to the flow channel sealing adapter at the outlet of the flow channel in the interlayer through an external high-temperature medium pipeline. The pump, heating device and flow channel in the interlayer form a closed passage.

[0015] Furthermore, the medium in the flow path of the pump, the heating device and the interlayer inner flow channel is a high boiling point medium.

[0016] Furthermore, a valve is provided on the external high-temperature medium pipeline between the pump and the inner flow channel of the interlayer, and a valve is also provided on the external high-temperature medium pipeline between the heating device and the inner flow channel of the interlayer.

[0017] Furthermore, the standard detector and the detector to be identified are respectively mounted on a multifunctional bracket outside the reactor core, and a mounting bracket for the detector to be identified is arranged at a position relative to the standard detector.

[0018] In a second aspect, the present invention further provides a method for operating a medium circulation radiation heating resistance test system, comprising the following steps:

[0019] S1. Keeping the reactor core shut down, installing and connecting the medium circulation type radiation resistance heating test system;

[0020] S2. Turn on the power supply of the detectors to ensure that the standard detector and the detector to be identified are in normal working state; start the pump to make the medium in the flow channel flow, and verify that the flow channel is operating normally without leakage; configure the data acquisition system to start continuously collecting signals from the standard detector, the temperature sensor, and the detector to be identified;

[0021] S3, starting the reactor core until the expected operating conditions are reached, keeping the reactor core in steady-state operation, and turning on the heating device to begin heating the medium in the flow channel;

[0022] S4. Continue heating. When the expected temperature is reached, keep the reactor core and temperature stable and continue collecting data from the standard detector, the detector to be identified, and the temperature sensor until the time requirement for the identification test is met.

[0023] S5. Maintaining steady-state operation of the reactor core, turning off the heating device to reduce the temperature; when the data acquisition system indicates that the temperature of the temperature sensor has dropped to a value close to the initial temperature, collecting data for a required time, and then reducing the reactor power until the reactor stops;

[0024] S6. After the reactor stops, stop collecting signals from the standard detector, temperature sensor, and detector to be identified, compare and analyze the signal data of the detector to be identified from the radiation field intensity dimension and the temperature dimension, perform data evaluation according to the identification test requirements, and identify the detector to be identified.

[0025] Compared with the prior art, the present invention has the following advantages and positive effects:

[0026] The present invention adopts a design of non-direct heating of the detector, eliminating the problem of traditional coil heating or magnetic heating generating an induced magnetic field that affects the carrier deflection of the detector and affects signal collection; the various components of the system are connected by radiation-resistant cables, ensuring that the device is not damaged by radiation when operating in a research reactor; under the protection of the shielding structure, key electronic components such as valves, data acquisition systems, pumps, heating devices and detector power supplies, as well as components that require human operation, are blocked from the high-irradiation environment of the reactor, which can reduce the damage that may be caused by the radiation field, thereby extending the service life of the equipment and ensuring the reliability of the equipment and the safety of personnel.

[0027] The present invention avoids the problem of local overheating during the heating process through its uniform heating design, and at the same time has good radiation resistance and is suitable for long-term work in a nuclear environment; the non-direct heating design effectively eliminates electrical signal interference and ensures the accuracy of the test data; wherein a plurality of parallel flow paths are arranged at the sleeve position, and each flow path can realize flow control by controlling the opening and closing degree of the valve to achieve the effect of precise temperature control. The more parallel groups there are, the more precise control of the temperature distribution can be achieved, avoiding the performance change of the detector to be identified due to uneven temperature distribution, and ensuring the accuracy of the test data; the heat transfer medium adopts a material with a high boiling point and good thermal conductivity, which can increase the heating and cooling efficiency and reduce the experimental time occupied by heating and cooling and waiting for temperature equilibrium. Considering that the price of experiments on the reactor pile is relatively expensive, this invention has good economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0029] Figure 1 This is a diagram of the test system of the present invention;

[0030] Figure 2 This is a layout diagram of the test system and reactor core of the present invention;

[0031] Figure 3 This is an axial cross-sectional view of the test device of the present invention;

[0032] Figure 4 It is a radial cross-sectional view of the test device of the present invention.

[0033] In the figure: 1. Data acquisition system; 2. Detector power supply; 3. Standard detector; 4. Reactor core; 5. Test device; 5-1. Outer sleeve; 5-2. Interlayer; 5-3. Inner sleeve; 5-4. Temperature sensor; 5-5. Detector to be identified; 5-6. Positioning structure; 5-7. Flow channel sealing adapter; 5-8. Flow channel in interlayer; 6. Valve; 7. Heating device; 8. Pump; 9. Shielding structure; 10. External high-temperature medium pipeline; 11. Radiation-resistant cable. DETAILED DESCRIPTION

[0034] It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meaning as commonly understood by those skilled in the art to which the present invention belongs.

[0035] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise clearly indicated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "comprising" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or their combinations;

[0036] During the R&D process, detectors must be subjected to various extreme environments. These extreme environments are often determined by the environmental parameters of the detector under various heat pipe reactor operating conditions. If the detector operates normally under these extreme conditions, it can be assumed to function properly in a heat pipe reactor environment. This type of R&D activity is generally referred to as qualification. The medium-circulating radiation-resistant heating test system described in this embodiment can be used to conduct on-pile testing in the vertical tunnels of a research reactor to verify the performance of the detector in extreme high-temperature, high-irradiation environments.

[0037] This embodiment discloses a medium circulation type radiation heating resistance test system, such as Figure 1-Figure 2 As shown, it includes a test device 5, a standard detector 3, a shielding structure 9, a pump 8, a heating device 7, a data acquisition system 1 and a detector power supply 2; the detector power supply 2 is used to power the standard detector 3 and the detector to be identified 5-5; the data acquisition system 1 is used to collect and compare the data of the standard detector 3 and the detector to be identified 5-5, monitor the actual temperature distribution of the detector to be identified 5-5, and control the heating process according to the actual temperature measurement results obtained, as well as control the flow rate of the pump 8; the pump 8, heating device 7, data acquisition system 1 and detector power supply 2 are all arranged in the shielding structure 9.

[0038] The test device 5 includes an inner sleeve 5-3, an interlayer 5-2, an outer sleeve 5-1 and an inner flow channel 5-8 of the interlayer; Figure 3-Figure 4 As shown, the detector to be identified 5-5 is arranged in the inner sleeve 5-3, and the temperature sensors 5-4 are evenly distributed on the side of the detector to be identified 5-5. The outer side of the inner sleeve 5-3 is provided with the interlayer 5-2, and the interlayer inner flow channel 5-8 is provided in the interlayer 5-2. The outer sleeve 5-1 is provided on the outer side of the interlayer 5-2, and the flow channel sealing adapter 5-7 is provided on the outer sleeve 5-1. The flow channel sealing adapter 5-7 is connected to the interlayer inner flow channel 5 -8 is connected; a detector positioning structure 5-6 is provided at the inner bottom of the inner sleeve 5-3, and the detector positioning structure 5-6 is fixedly connected to the inner sleeve 5-3, and is used to limit the movement of the detector assembly to a deeper level to achieve the positioning function; the interlayer inner flow channel 5-8 is a spiral channel, or an S-shaped reciprocating channel, and a plurality of interlayer inner flow channels 5-8 are evenly arranged in the interlayer 5-2, and the inlet and outlet of each of the interlayer inner flow channels 5-8 are connected to the flow channel sealing adapter 5-7.

[0039] The detector power supply 2 is connected to the standard detector 3 and the detector to be identified 5-5 respectively, and the detector power supply 2 is connected to the standard detector 3 and the detector to be identified 5-5 through a cable, and the cable is a radiation-resistant cable 11 with radiation resistance; the data acquisition system 1 is connected to the standard detector 3, the temperature sensor 5-4, the detector to be identified 5-5, the pump 8 and the heating device 7 through a radiation-resistant cable 11, or a converter is provided on the shielding structure 9, and the part inside the shielding structure 9 is connected with an ordinary cable, and the outside of the shielding structure 9 is connected with a radiation-resistant cable; the pump 8 is connected to the inner flow channel 5 of the interlayer through an external high-temperature medium pipe 10 -8 is connected to the flow channel sealing adapter 5-7 at the inlet of the interlayer, the pump 8 is connected to the heating device 7 through an external high-temperature medium pipeline 10, and the heating device 7 is connected to the flow channel sealing adapter 5-7 at the outlet of the interlayer flow channel 5-8 through an external high-temperature medium pipeline 10. The pump 8, the heating device 7 and the interlayer flow channel 5-8 form a closed passage, and the medium in the flow path among the pump 8, the heating device 7 and the interlayer flow channel 5-8 is a high-boiling point medium, such as liquid gold; a valve 6 is provided on the external high-temperature medium pipeline between the pump 8 and the interlayer flow channel 5-8, and a valve 6 is also provided on the external high-temperature medium pipeline between the heating device 7 and the interlayer flow channel 5-8.

[0040] The heating of the test device 5 is carried out by Figure 1 and Figure 2The heat conduction of the medium flow path shown by the dashed line is achieved. When the heating device 7 is turned on, the heating device 7 heats the high-boiling-point medium. After reaching the specified temperature, the medium enters the interlayer flow channel 5-8 through the pump 8, valve 6, and flow channel seal adapter 5-7. The heat is then transferred to the detector 5-5 to be identified through the inner sleeve 5-3. After that, the heat returns to the heating device 7 through the flow channel seal, adapter, and valve 6 for reheating, and the above cycle is repeated. In this embodiment, five groups of interlayer flow channels 5-8 are provided in the interlayer 5-2. Five groups of parallel flow paths are arranged between the pump 8, heating device 7, and interlayer flow channels 5-8. Each group of flow paths can achieve flow control by controlling the opening and closing degree of valve 6 to achieve precise temperature control. The more parallel groups there are, the more uniform heating of the detector 5-5 to be identified is achieved, and the better the uniform control effect, thus avoiding performance changes of the detector 5-5 to be identified due to uneven temperature distribution, and ensuring the accuracy of the test data.

[0041] The detector power supply 2 is connected to the standard detector 3 and the detector to be identified 5-5 via a radiation-resistant cable 11. The data acquisition system 1 is connected to the standard detector 3, temperature sensor 5-4, detector to be identified 5-5, pump 8, and heating device 7 via a radiation-resistant cable 11, which is used to provide high voltage, extract detector and temperature sensor 5-4 signals, and other functions. Because the radiation-resistant cable 11 can operate for long periods of time in a high-radiation environment, it ensures that the device is not damaged by excessive radiation during the identification experiment. Furthermore, by isolating key electronic components such as the valve 6, pump 8, heating device 7, data acquisition system 1, and detector power supply 2, as well as components requiring human operation, from the high-radiation environment of the reactor, the shielding structure 9 can reduce potential damage to them from the radiation field, thereby ensuring the reliability of the equipment and the safety of personnel.

[0042] The standard detector 3 is used to monitor the operating status of the reactor during the entire identification experiment. The standard detector 3 and the detector to be identified 5-5 are respectively installed on the multifunctional bracket outside the reactor core 4, and the standard detector 3 and the detector to be identified 5-5 are arranged opposite each other. Therefore, the standard detector 3 will not be affected by high temperature, and there are generally no other structural obstructions on the outside of the standard detector 3, which can make the measurement of the operating status of the reactor core 4 more accurate and eliminate the influence of high temperature and other structural obstructions. The detector power supply 2 is used to provide bias voltage to the standard detector 3 and the detector to be identified 5-5 to keep them in working state. The data acquisition system 1 simultaneously monitors the output signals of the standard detector 3 and the detector to be identified 5-5, and evaluates the performance of the detector to be identified 5-5 in a high temperature and high radiation environment by comparing the output signals of the two.

[0043] Working methods:

[0044] S1. Keep the reactor core 4 shut down and install and connect the medium circulation radiation resistance heating test system.

[0045] S2. Turn on the detector power supply 2 so that the standard detector 3 and the detector to be identified 5-5 are in normal working condition; start the pump 8 to make the medium in the flow channel flow, and verify that the flow channel is operating normally without leakage; configure the data acquisition system 1 and start to continuously collect signals from the standard detector 3, the temperature sensor 5-4 and the detector to be identified 5-5.

[0046] S3. Start the reactor core 4 until the expected operating conditions are reached. When the expected operating conditions are reached, both the standard detector 3 and the detector to be identified 5-5 output radiation field measurement signals. Keep the reactor core 4 in steady-state operation and turn on the heating device 7. At this time, the medium in the flow channel begins to be heated. Since the detector body is not directly heated here, the heating process will not affect the detector electrical signal. At this time, the signal change of the detector to be identified 5-5 begins, and is caused by a change in a single temperature factor.

[0047] S4. Continue heating. Since the medium in the flow channel uses a high-boiling-point medium, the surface temperature of the detector to be identified 5-5 can be obtained in the data acquisition system 1. When the expected temperature is reached, the negative feedback design can be used to maintain temperature stability; keep the reactor core 4 and temperature stable, and continue to collect data from the standard detector 3, the detector to be identified 5-5 and the temperature sensor 5-4 until the time requirement for the identification test is met.

[0048] S5. Maintain steady-state operation of the reactor core 4 and turn off the heating device 7 to reduce the temperature; when the data acquisition system 1 shows that the temperature of the temperature sensor 5-4 has dropped to a temperature close to the initial temperature, collect data for the required time, and then reduce the reactor power until the reactor is shut down.

[0049] S6. After the reactor stops, stop collecting the signals of the standard detector 3, temperature sensor 5-4 and the detector to be identified 5-5, and compare and analyze the signal data of the detector to be identified 5-5 from the radiation field intensity dimension and the temperature dimension. At this time, the data of the standard detector 3 is used as the benchmark for the evaluation of the radiation field intensity dimension, and the data of the temperature sensor 5-4 is used as the benchmark for the evaluation of the temperature dimension; perform data evaluation according to the identification test requirements, and identify the detector to be identified 5-5.

[0050] Although the above describes the specific embodiments of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without any creative work are still within the scope of protection of the present invention.

Claims

1. A medium circulation radiation heating resistance test system, characterized in that: Includes test device, standard detector, reactor core, shielding structure, pump, heating device, data acquisition system and detector power supply; The test device also includes an inner sleeve, an interlayer, an outer sleeve, and an inner flow channel of the interlayer; the inner sleeve is used to place the detector to be identified, and temperature sensors are evenly distributed on the inner side surface of the inner sleeve. The outer side of the inner sleeve is provided with the interlayer, and the inner flow channel of the interlayer is provided in the interlayer. The outer sleeve is provided with the outer side of the interlayer; a detector positioning structure is provided at the inner bottom of the inner sleeve, and the detector positioning structure is fixedly connected to the inner sleeve and is used to limit the movement of the detector to be identified to a deeper depth to achieve a positioning function; The detector power supply is used to power the standard detector and the detector to be identified in the test device; the data acquisition system is used to collect and compare data from the standard detector, the detector to be identified and the temperature sensor. The data acquisition system is also connected to the pump and the heating device respectively to control the flow rate of the pump and the opening and closing of the heating device; the pump, heating device, data acquisition system and detector power supply are all arranged in the shielding structure.

2. A medium circulation type radiation heating resistance test system according to claim 1, characterized in that: The outer sleeve is provided with a flow channel sealing adapter, and the flow channel sealing adapter is communicated with the flow channel in the interlayer.

3. A medium circulation type radiation heating resistance test system according to claim 2, characterized in that: The interlayer inner flow channel is a spiral channel, and a plurality of interlayer inner flow channels are evenly arranged in the interlayer. The inlet and outlet of each interlayer inner flow channel are connected to the flow channel sealing adapter.

4. A medium circulation type radiation heating resistance test system according to claim 2, characterized in that: The detector power supply is connected to the standard detector via a cable. The cable is a radiation-resistant cable with radiation resistance. The cable is also used to connect the detector power supply and the detector to be identified.

5. A medium circulation type radiation heating resistance test system according to claim 4, characterized in that: The data acquisition system is connected to the standard detector and the heating coil power supply via the cable, and the cable is also used to connect the data acquisition system and the detector to be identified.

6. A medium circulation type radiation heating resistance test system according to claim 2, characterized in that: The pump is connected to the heating device through an external high-temperature medium pipeline, and the heating device is connected to the flow channel sealing adapter at the outlet of the interlayer flow channel through an external high-temperature medium pipeline. The pump, heating device and interlayer flow channel form a closed passage.

7. A medium circulation type radiation heating resistance test system according to claim 6, characterized in that: The medium in the flow path of the pump, the heating device and the interlayer inner flow channel is a high boiling point medium.

8. The medium circulation type radiation heating resistance test system according to claim 6, characterized in that: A valve is provided on the external high-temperature medium pipeline between the pump and the inner flow channel of the interlayer, and a valve is also provided on the external high-temperature medium pipeline between the heating device and the inner flow channel of the interlayer.

9. The medium circulation type radiation heating resistance test system according to claim 1, characterized in that: The standard detector and the detector to be identified are respectively mounted on a multifunctional bracket outside the reactor core, and a mounting bracket of the detector to be identified is arranged at a position opposite to the standard detector.

10. The operating method of a medium circulation type radiation heating resistance test system according to any one of claims 2 to 9, characterized in that: The following steps are involved: S1. Keeping the reactor core shut down, installing and connecting the medium circulation type radiation resistance heating test system; S2. Turn on the power supply of the detectors to ensure that the standard detector and the detector to be identified are in normal working state; start the pump to make the medium in the flow channel flow, and verify that the flow channel is operating normally without leakage; configure the data acquisition system to start continuously collecting signals from the standard detector, the temperature sensor, and the detector to be identified; S3, starting the reactor core until the expected operating conditions are reached, keeping the reactor core in steady-state operation, and turning on the heating device to begin heating the medium in the flow channel; S4. Continue heating. When the expected temperature is reached, keep the reactor core and temperature stable and continue collecting data from the standard detector, the detector to be identified, and the temperature sensor until the time requirement for the identification test is met. S5. Maintaining steady-state operation of the reactor core, turning off the heating device to reduce the temperature; when the data acquisition system indicates that the temperature of the temperature sensor has dropped to a value close to the initial temperature, collecting data for a required time, and then reducing the reactor power until the reactor stops; S6. After the reactor stops, stop collecting signals from the standard detector, temperature sensor, and detector to be identified, compare and analyze the signal data of the detector to be identified from the radiation field intensity dimension and the temperature dimension, perform data evaluation according to the identification test requirements, and identify the detector to be identified.

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