Medium circulation type radiation-resistant heating test system and method

Abstract

The invention discloses a medium circulation type radiation-resistant heating test system and method. The influence of a traditional heating mode on an electric signal of a detector is avoided. The problem of local overheating in the heating process is avoided, meanwhile, the influence of external high temperature on the reactor core of the reactor is avoided, and development of the detector adapting to the heat pipe reactor environment is achieved; the technical scheme comprises a test device, a standard detector, a heating device and a data acquisition system. The detector power supply is used for supplying power to the standard detector and the detector to be identified; the data acquisition system is respectively connected with the standard detector, the pump and the heating device; and the pump, the heating device, the data acquisition system and the detector power supply are all arranged in the shielding structure.

Description

Technical Field

[0001] The invention belongs to the technical field of nuclear power plant detectors, and in particular relates to a medium circulation type radiation resistance heating 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 micro reactor, 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 design 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, effectively avoiding serious accidents.

[0004] However, heat pipe reactors are small and solid-state. In order to obtain a sufficiently large neutron injection rate outside the reactor in the extra-pillar nuclear measurement system, the extra-pillar detector needs to be close to the reactor core, which makes the ambient temperature of the extra-pillar detector 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 view of the above problems, the present invention provides a medium circulation radiation-resistant heating test system and method, which conducts heat through a high-boiling-point flowing medium, thereby avoiding the influence of traditional heating methods on the detector electrical signal; 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 influence of external high temperatures on the reactor core, thereby realizing the development of detectors that can 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, including a test device, 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, the inner side surface of the inner sleeve is evenly distributed with temperature sensors, the outer side of the inner sleeve is provided with the interlayer, the interlayer inner flow channel is provided in the interlayer, and the outer sleeve is provided with the outer side of the interlayer; the inner bottom of the inner sleeve is provided with a detector positioning structure, the detector positioning structure is fixedly connected to the inner sleeve, and is used to limit the detector to be identified from moving deeper to achieve the 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, the heating device, the data acquisition system and the 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, and the pump, the heating device and the 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 arrangement of the detector to be identified is arranged at a relative position of the standard detector.

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

[0019] S1. Keep the reactor core shut down, and install and connect the medium circulation type radiation resistance heating test system;

[0020] S2, turning on the detector power supply, so that the standard detector and the detector to be identified are in normal working state; starting the pump to make the medium in the flow channel flow, and verifying that the flow channel is operating normally without leakage; configuring the data acquisition system, and starting to continuously collect signals from the standard detector, the temperature sensor and the detector to be identified;

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

[0022] S4, continue heating, and when the expected temperature is reached, keep the reactor core and temperature stable, and continue to collect data from the standard detector, the detector to be identified, and the temperature sensor until the time requirement of the identification test is reached;

[0023] S5, maintaining the steady-state operation of the reactor core, turning off the heating device to reduce the temperature; when the data acquisition system shows that the temperature of the temperature sensor has dropped to a temperature 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 dimensions of radiation field intensity and temperature, 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 signal collection by deflecting the detector carriers; 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 isolated from the high-irradiation environment of the reactor, which can reduce possible damage to them 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 has good radiation resistance and is suitable for long-term work in a nuclear environment; and the indirect heating design effectively eliminates electrical signal interference and ensures the accuracy of test data; wherein a plurality of parallel flow paths are arranged at the sleeve position, and each flow path can achieve flow control by controlling the degree of opening and closing of the valve to achieve the effect of precise temperature control, and the more parallel groups there are, the more precise control of temperature distribution can be achieved, avoiding changes in the performance 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 efficiency of heating and cooling, and can reduce the experimental time occupied by heating and cooling and waiting for temperature equilibrium. Considering that the price of experiments on reactor piles is relatively expensive, this invention has good economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings in the specification, 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 It is a test system diagram of the present invention;

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

[0031] Figure 3 It 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 descriptions are illustrative and 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 meanings as those 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 explicitly stated 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 "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0036] During the research and development process, it is necessary to impose various extreme environments on the detector. These extreme environments are often determined by the environmental parameters of the detector under various working conditions of the heat pipe pile. If the detector can operate normally under these extreme environments, it can be considered that the detector can operate normally under the heat pipe pile environment. This type of research and development behavior is generally called identification. The medium circulation type radiation resistance heating test system described in this embodiment can be used to conduct on-pile tests in the vertical channel of the research reactor to verify the performance of the detector in high temperature and high radiation extreme 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, the heating device 7, the data acquisition system 1 and the detector power supply 2 are all arranged in the shielding structure 9.

[0038] The test device 5 comprises 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 side of the detector to be identified 5-5 is evenly distributed with temperature sensors 5-4, 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, and the outer sleeve 5-1 is provided on the outer sleeve 5-1. The flow channel sealing adapter 5-7 is provided on the inner flow channel 5-8 of the interlayer. -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 the 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 pipeline 10 -8 is connected with the flow channel sealing adapter 5-7 at the inlet of the interlayer, the pump 8 is connected with the heating device 7 through an external high-temperature medium pipeline 10, and the heating device 7 is connected with 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 arranged on the external high-temperature medium pipeline between the pump 8 and the interlayer flow channel 5-8, and a valve 6 is also arranged 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 dotted line is realized. When the heating device 7 is turned on, the heating device 7 heats the high boiling point medium, and after reaching the specified temperature, it enters the interlayer flow channel 5-8 through the pump 8, valve 6 and flow channel sealing adapter 5-7, and then transfers the heat to the detector 5-5 to be identified through the inner sleeve 5-3, and then returns to the heating device 7 through the flow channel seal, adapter and valve 6 for reheating and continues to repeat the above cycle. In this embodiment, five groups of interlayer flow channels 5-8 are arranged in the interlayer 5-2, and five groups of parallel flow paths are arranged between the pump 8, the heating device 7 and the interlayer flow channels 5-8. Each group of flow paths can achieve flow control by controlling the opening and closing degree of the valve 6 to achieve the effect of 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 is, avoiding the performance change 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 through a radiation-resistant cable 11; 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, which is used to provide high voltage, lead out the detector and temperature sensor 5-4 signals and other functions. Since the radiation-resistant cable 11 can work for a long time in a high-radiation environment, it is ensured that the device is not damaged by excessive radiation during the identification experiment. In addition, by isolating key electronic components such as valves 6, pumps 8, heating devices 7, data acquisition systems 1 and detector power supplies 2, as well as components that require human operation from the high-radiation environment of the reactor, under the protection of the shielding structure 9, the damage that may be caused to them by the radiation field can be reduced, 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 to each other, so the standard detector 3 will not be affected by high temperature, and there is generally no other structural obstruction outside 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 method:

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

[0045] S2. Turn on the detector power supply 2 to make the standard detector 3 and the detector to be identified 5-5 in normal working state; start the pump 8 to make the medium in the flow channel flow, and verify that the flow channel operates normally without leakage; configure the data acquisition system 1 and start to continuously collect the signals of 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 condition is reached. When the expected operating condition is reached, both the standard detector 3 and the detector 5-5 to be identified have radiation field measurement signal outputs. Keep the reactor core 4 in steady-state operation, turn on the heating device 7, and start heating the medium in the flow channel. Since the detector body is not directly heated here, the heating process will not affect the detector electrical signal. At this time, the signal of the detector 5-5 to be identified starts to change, and it is caused by the change of 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 5-5 to be identified 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 5-5 to be identified and the temperature sensor 5-4 until the time requirement for the identification test is met.

[0048] S5. Maintain the 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 it is shut down.

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

[0050] Although the above describes the specific implementation mode 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 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 equipment, standard detectors, reactor core, shielding structure, pumps, heating devices, 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, the inner side surface of the inner sleeve is evenly distributed with temperature sensors, the outer side of the inner sleeve is provided with the interlayer, the interlayer inner flow channel is provided in the interlayer, and the outer sleeve is provided with the outer side of the interlayer; the inner bottom of the inner sleeve is provided with a detector positioning structure, the detector positioning structure is fixedly connected to the inner sleeve, and is used to limit the detector to be identified from moving deeper to achieve the 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, the heating device, the data acquisition system and the detector power supply are all arranged in the shielding structure.

2. A medium circulation type radiation heating resistance test system as claimed in 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 as claimed in 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 as claimed in 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 as claimed in claim 4, characterized in that: The data acquisition system is connected to the standard detector and the heating coil power supply through 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 as claimed in 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 flow channel in the interlayer through an external high-temperature medium pipeline. The pump, the heating device and the flow channel in the interlayer form a closed passage.

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

9. A medium circulation type radiation heating resistance test system as claimed in 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 arrangement of the detector to be identified is arranged at a position opposite to the standard detector.

10. The working 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. Keep the reactor core shut down, and install and connect the medium circulation type radiation resistance heating test system; S2, turning on the power supply of the detector, so that the standard detector and the detector to be identified are in normal working state; starting the pump to make the medium in the flow channel flow, and verifying that the flow channel is operating normally without leakage; configuring the data acquisition system, and starting to continuously collect signals from the standard detector, the temperature sensor and the detector to be identified; S3, starting the reactor core until the expected operating condition is reached, keeping the reactor core in steady-state operation, turning on the heating device, and starting to heat the medium in the flow channel; S4, continue heating, and when the expected temperature is reached, keep the reactor core and temperature stable, and continue to collect data from the standard detector, the detector to be identified, and the temperature sensor until the time requirement of the identification test is met; S5, maintaining the steady-state operation of the reactor core, turning off the heating device to reduce the temperature; when the data acquisition system shows that the temperature of the temperature sensor has dropped to a temperature 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 dimensions of radiation field intensity and temperature, perform data evaluation according to the identification test requirements, and identify the detector to be identified.

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