Heating rod detection system and method and nuclear reactor

Abstract

The invention provides a heating rod detection system and method and a nuclear reactor, and the heating rod detection system comprises an air tightness detection module which is suitable for detecting the air tightness of a heating rod by detecting the pressure change of test gas; the water pressure detection module is suitable for applying test pressure to the heating rod and maintaining the pressure for a preset time so as to detect the water pressure bearing capacity of the heating rod; the thermocouple characteristic detection module is suitable for calibrating each thermocouple; the resistance detection module is used for judging whether the resistance deviation between each heating rod and the average resistance is qualified or not; the nondestructive testing module is suitable for detecting the quality of the heating rod through rays, ultrasound, infrared rays and electromagnetism and analyzing the position and the size of a possible defect of the heating rod; and the structure detection module is suitable for detecting the specification, the number, the appearance, the identification and the size of the heating rod.

Description

Technical Field

[0001] The present application mainly relates to the field of nuclear power technology, and in particular to a heating rod detection system and method and a nuclear reactor. Background Art

[0002] Critical heat flux (CHF) refers to the heat generated per unit surface area when the boiling heat transfer mechanism changes and the heat transfer on the surface of the heating element deteriorates. It is the comprehensive result of fluid dynamics and thermodynamic phenomena. When CHF occurs at low vapor content, it is generally called deviation from nucleate boiling (DNB), and when CHF occurs at high vapor content, it is generally called dryout.

[0003] The CHF test is usually carried out in a high-temperature and high-pressure test circuit under different pressures, coolant inlet flow rates, coolant inlet temperatures and other working conditions to obtain the CHF value when the heat transfer on the heating rod surface deteriorates. The CHF test technology is very complex and has certain risks. The heating rod used in the CHF test is a key test piece. The various technical indicators of the heating rod directly affect the success or failure of the CHF test. The heating rod used in the CHF test should have the function of simulating nuclear heat release and monitoring the temperature changes at specific locations on the rod surface.

[0004] At present, there is a lack of a complete and systematic detection method for heating rods used in CHF tests at home and abroad. Therefore, it is urgent to establish a detection method for heating rods used in CHF tests in order to fully ensure that the manufacturing of heating rods used in CHF tests meets the technical requirements, thereby supporting the implementation of CHF tests. Summary of the invention

[0005] The technical problem to be solved by the present application is to provide a heating rod detection system and method and a nuclear reactor, which can comprehensively and systematically detect the heating rods used in CHF tests to ensure that the heating rods can meet the technical requirements, thereby supporting the implementation of CHF tests.

[0006] In order to solve the above technical problems, the present application provides a heating rod detection system, which is applicable to a nuclear reactor, wherein the nuclear reactor comprises a plurality of heating rods, each of the heating rods comprises one or more thermocouples, each of the thermocouples comprises a thermocouple armor and a thermocouple wire, the heating rod further comprises a heating section, and the heating rod detection system comprises: an airtightness detection module, the airtightness detection module is suitable for detecting the airtightness of the heating rod by detecting the pressure change of the test gas; a water pressure detection module, the water pressure detection module is suitable for applying a test pressure to the heating rod and maintaining the pressure for more than a preset time to detect the water pressure bearing capacity of the heating rod; a thermocouple characteristic detection module, the thermocouple characteristic detection module is suitable for detecting each of the heating rods; Thermocouples are calibrated, and the thermocouple characteristic detection module is suitable for judging whether the thermocouples are qualified under test conditions; a resistance detection module, the resistance detection module performs resistance detection on a plurality of the heating rods and the heating sections of the plurality of the heating rods and calculates the average resistance of each of the heating rods, and judges whether the resistance deviation between each heating rod and the average resistance is qualified; a non-destructive testing module, the non-destructive testing module is suitable for detecting the quality of the heating rods through X-ray, ultrasound, infrared and electromagnetic detection and analyzing the location and size of possible defects in the heating rods; a structure detection module, the structure detection module is suitable for detecting the specifications, quantity, appearance, markings and dimensions of the heating rods.

[0007] Optionally, the airtightness detection module is suitable for filling the heating rod with nitrogen and detecting the airtightness of the heating rod, wherein the detection pressure of the nitrogen is the working pressure.

[0008] Optionally, the test pressure applied by the water pressure detection module to the heating rod is 15MPa to 20MPa, and the preset time is 10min to 15min.

[0009] Optionally, the thermocouple characteristic detection module is suitable for calibrating each of the thermocouples, and the calibration includes calibrating the temperature and accuracy of the heating rod and the arrangement position of the thermocouple.

[0010] Optionally, the thermocouple characteristic detection module will perform an insulation test on the thermocouple, and the test conditions of the insulation test include placing the heating rod in an environment of 400V~600V test voltage, 15℃~35℃ test temperature, 45%~75% relative humidity and 86kPa~106kPa atmospheric pressure.

[0011] Optionally, determining whether the thermocouple is qualified includes determining whether the insulation resistance between the thermocouple wire and the thermocouple armor is greater than or equal to 500 kΩ and determining whether the insulation resistance between the thermocouple armor and the heating rod is greater than or equal to 10 kΩ.

[0012] Optionally, determining whether the resistance deviation between each of the heating rods and the average resistor is qualified includes determining whether the resistance deviation between each of the heating rods and the average resistor is less than or equal to ±3%.

[0013] In order to solve the above technical problems, the present application provides a heating rod detection method, which is applicable to a nuclear reactor, wherein the nuclear reactor comprises a plurality of heating rods, each of the heating rods comprises one or more thermocouples, each of the thermocouples comprises a thermocouple armor and a thermocouple wire, and the heating rod further comprises a heating section, and the detection method comprises the following steps: detecting the pressure change of the test gas through an airtightness detection module to detect the airtightness of the heating rod; applying a test pressure to the heating rod through a water pressure detection module, and maintaining the pressure for more than a preset time to detect the water pressure bearing capacity of the heating rod; and detecting each thermocouple characteristic detection module through a thermocouple characteristic detection module. The thermocouple is calibrated, and the thermocouple characteristic detection module is suitable for judging whether the thermocouple is qualified under test conditions; the resistance detection module is used to detect the resistance of multiple heating rods and the heating sections of multiple heating rods and calculate the average resistance of each heating rod, and judge whether the resistance deviation between each heating rod and the average resistance is qualified; the quality of the heating rod is detected by the X-ray, ultrasonic, infrared and electromagnetic detection of the non-destructive detection module, and the position and size of possible defects in the heating rod are analyzed; the specification, quantity, appearance, mark and size of the heating rod are detected by the structure detection module.

[0014] In order to solve the above technical problems, the present application provides a nuclear reactor, comprising: a plurality of heating rods, each of the heating rods comprising one or more thermocouples, each of the thermocouples comprising a thermocouple armor and a thermocouple wire, the heating rod also comprising a heating section, and the heating rod is suitable for detection by the heating rod detection system as described above.

[0015] Optionally, the heating rod further includes an upper conductive tube, a lower conductive tube and a transition conductive tube, the heating section of the heating rod includes an Inconel-600 heating tube and an insulating ceramic block, and the thermocouple is located in the Inconel-600 heating tube.

[0016] Compared with the prior art, the present application performs air tightness detection on the heating rod through an air tightness detection module, performs water pressure bearing capacity detection on the heating rod through a water pressure detection module, and detects the thermocouple in the heating rod through a thermocouple characteristic detection module to ensure that the thermocouple can monitor the wall temperature of the heating rod and the CHF transient temperature during the test. Furthermore, the resistance detection module is used to determine whether the resistance of the heating rod is qualified, the non-destructive testing module is used to determine the quality of the heating rod, and the location and size of possible defects in the heating rod are analyzed. Finally, the structural detection module is used to detect the specifications and quantity of the heating rod to ensure the structural integrity of the heating rod. The above modules can be used to comprehensively and systematically detect the heating rod used for the CHF test to ensure that the heating rod can meet the technical requirements, thereby supporting the implementation of the CHF test. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings are included to provide a further understanding of the present application. They are included and constitute a part of the present application. The accompanying drawings illustrate embodiments of the present application and together with the present specification serve to explain the principles of the present application. In the accompanying drawings:

[0018] Figure 1 This is a schematic diagram of the module structure of a heating rod detection system in one embodiment of the present application;

[0019] Figure 2 It is a flow chart of a heating rod detection method in one embodiment of the present application;

[0020] Figure 3 It is a schematic structural diagram of a heating rod in a nuclear reactor in one embodiment of the present application. DETAILED DESCRIPTION

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for the description of the embodiments. Obviously, the drawings described below are only some examples or embodiments of the present application. For ordinary technicians in this field, the present application can also be applied to other similar scenarios based on these drawings without creative work. Unless it is obvious from the language environment or otherwise explained, the same reference numerals in the figures represent the same structure or operation.

[0022] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "an" and / or "the" do not refer to the singular and may also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of the steps and elements that have been clearly identified, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions and numerical values ​​of the parts and steps set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to those of ordinary skill in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0024] In the description of the present application, it should be understood that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the device or element referred to must have a specific direction or be constructed and operated in a specific direction, and therefore cannot be understood as limiting the scope of protection of the present application; the directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0025] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0026] In addition, it should be noted that the use of words such as "first" and "second" to define components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above words have no special meaning and cannot be understood as limiting the scope of protection of this application. In addition, although the terms used in this application are selected from well-known and commonly used terms, some terms mentioned in the specification of this application may be selected by the applicant at his or her discretion, and their detailed meanings are explained in the relevant parts of the description of this article. In addition, it is required to understand this application not only by the actual terms used, but also by the meaning implied by each term.

[0027] This application refers to Figure 1 A heating rod detection system 10 is shown, which is suitable for a nuclear reactor. In order to better introduce the heating rod detected by the heating rod detection system 10, the following will first refer to Figure 3 The detailed structure of the heating rod used for CHF test in a nuclear reactor is introduced.

[0028] First refer to Figure 3 The nuclear reactor includes a plurality of heating rods 101, each of which includes one or more thermocouples 11, each of which includes a thermocouple armor (not shown) and a thermocouple wire (not shown), and the heating rod 101 also includes a heating section 12, wherein the heating section 12 includes an Inconel-600 heating tube 13 and an insulating ceramic block 14. The heating rod 101 is assembled from an upper conductive tube 15, a lower conductive tube 16, a transition conductive tube 17, an Inconel-600 heating tube 13, a thermocouple 11 and an insulating ceramic block.

[0029] Furthermore, the thermocouple 11 is located inside the Inconel-600 heating tube 13, which can monitor the wall temperature of the heating rod 101 and the CHF transient temperature during the test, and the Inconel-600 heating tube 13 can simulate the nuclear heat release inside the nuclear reactor, so that the test can be closer to the state of the heating tube inside the real nuclear reactor, further improving the accuracy and reliability of the test. On the other hand, the insulating ceramic block 14 is used to ensure the insulation between the thermocouple 11 and the heating tube 13. The Inconel-600 heating tube 13 of the heating rod 101 mainly adopts the electric heating mode, so the heating rod 101 also includes an upper conductive tube 15, a lower conductive tube 16 and a transition conductive tube 17 for conductive heating.

[0030] Now return to reference Figure 1 , Figure 1The module structure diagram of the heating rod detection system 10 (hereinafter referred to as "detection system 10") is shown. The detection system 10 includes an airtight detection module, a water pressure detection module, a thermocouple characteristic detection module, a resistance detection module, a nondestructive detection module and a structure detection module. Specifically, the airtight detection module is suitable for detecting the airtightness of the heating rod by detecting the pressure change of the test gas.

[0031] In this embodiment, the airtight detection module is suitable for filling nitrogen into the heating rod and detecting the airtightness of the heating rod. Specifically, the airtight detection module mainly controls the internal and external pressures of the heating rod by filling nitrogen. If there is an airtight leakage in the heating rod, the internal and external pressure difference of the heating rod will be reduced, so as to determine whether the airtightness of the heating rod meets the requirements. The airtightness test is usually carried out after the heating rod is assembled. The detection pressure is the working pressure, and the pressure is maintained for 5 to 15 minutes. If no bubbles are generated during the airtight test, and the room temperature insulation resistance of the heating rod after the test is ≥10kΩ, it proves that the CHF test heating rod has good airtightness. In other embodiments of the present application, other inert gases can be used to detect the airtightness of the heating rod, and in actual application scenarios, the pressure holding time can be appropriately extended according to the test requirements, and the present application does not limit this.

[0032] Furthermore, the water pressure detection module is suitable for applying a test pressure to the heating rod, and maintaining the pressure for more than a preset time to detect the water pressure bearing capacity of the heating rod. Among them, the test pressure applied by the water pressure detection module to the heating rod is 15MPa~20MPa, and the preset time is 10min~15min. During the test, if there is no leakage or unacceptable deformation of the heating rod, and the room temperature insulation resistance of the heating rod after the test is ≥10kΩ, it is judged that the water pressure test of the heating rod meets the requirements. In actual application scenarios, the preset time for maintaining pressure can be appropriately extended depending on the test requirements, and this application does not impose any restrictions on this.

[0033] On the other hand, the thermocouple characteristic detection module is suitable for calibrating each thermocouple, and the thermocouple characteristic detection module is suitable for judging whether the thermocouple is qualified under test conditions. In this embodiment, the thermocouple characteristic detection module calibrates the thermocouples one by one before the thermocouples are assembled, welded, and welded, and the calibration includes calibrating the temperature, accuracy, and thermocouple arrangement position of the heating rod. In this embodiment, preferably, when calibrating the thermocouples, the number of calibration points is not less than 5, the calibration temperature range is 200℃~600℃, and the calibrated points reach Class I accuracy, the error is <0.4%, and the thermocouple characteristic detection module needs to provide a calibration data chart for reference.

[0034] Furthermore, in the process of assembling the thermocouples into the heating rods, each heating rod is assembled with at least 5 thermocouples. The thermocouple characteristic detection module will detect the layout position of the thermocouples after the thermocouples are assembled. When the deviation between the layout position of the thermocouple and the design position is within ±2mm, it is determined that the layout position of the thermocouple meets the requirements.

[0035] In this embodiment, after the thermocouple is assembled into the heating rod, the thermocouple characteristic detection module will detect the insulation performance of the thermocouple, and the test conditions include placing the heating rod in an environment of 400V~600V test voltage, 15℃~35℃ test temperature, 45%~75% relative humidity and 86kPa~106kPa atmospheric pressure for testing. Determining whether the insulation characteristics of the thermocouple are qualified includes determining whether the insulation resistance between the thermocouple wire and the thermocouple armor is greater than or equal to 500kΩ and determining whether the insulation resistance between the thermocouple armor and the heating rod is greater than or equal to 10kΩ. The above-mentioned detection parameters can be adjusted accordingly according to the actual test situation, and this application does not limit this.

[0036] On the other hand, the resistance detection module performs resistance detection on multiple heating rods and the heating sections of multiple heating rods and calculates the average resistance of each heating rod, and determines whether the resistance deviation between each heating rod and the average resistance is qualified. Furthermore, the resistance detection module determines whether the resistance characteristics of the heating rod are qualified by determining whether the resistance deviation between each heating rod and the average resistance is less than or equal to ±3%.

[0037] Furthermore, the non-destructive testing module is suitable for detecting the quality of the heating rod through X-ray, ultrasound, infrared and electromagnetic, and analyzing the location and size of possible defects in the heating rod. The non-destructive testing module can review the various structures of the heating rod and determine whether its various performance indicators and components meet the technical requirements for manufacturing heating rods for CHF tests. The non-destructive testing module mainly uses X-ray, ultrasound, infrared, electromagnetic and other principle technologies and combines instruments to detect defects, chemical and physical parameters of materials, parts and equipment without damaging or affecting the performance of the object being tested.

[0038] Exemplarily, the weld instructions of the heating rod can be detected by the ultrasonic monitoring method of the non-destructive testing module. On the other hand, since a part of the ultrasonic wave will be reflected when encountering a defect, the position and size of the defect can be measured by analyzing the reflected wave, so the non-destructive testing module can also use the characteristics of ultrasonic wave propagation in the material to detect defects or changes in the material. In this embodiment, the non-destructive testing module can also perform sampling analysis and detection on the material performance indicators and components of the heating rod.

[0039] On the other hand, the structural detection module is suitable for detecting the specifications, quantity, appearance, identification and size of the heating rod, such as checking whether the outer diameter, wall thickness, length and straightness of the heating rod meet the test requirements. Specifically, it is necessary to detect whether the heating rod number identification of the CHF test heating rod is clear, that is, it is necessary to further identify whether the type and number and identification of the heating rod match the product. Furthermore, it is necessary to further determine whether the identification of the thermocouple is clear, where the identification content includes the thermocouple number, and identify whether the thermocouple matches the heating rod.

[0040] On the other hand, the present application also refers to Figure 2 A heating rod detection method 20 is proposed, which is applicable to the heating rod detection system proposed in any embodiment of the present application, such as the above-mentioned detection system 10. A flow chart is used in the present application to illustrate the operations performed by the system according to the embodiment of the present application. It should be understood that the previous or following operations are not necessarily performed in exact sequence. On the contrary, various steps can be processed in reverse order or simultaneously. At the same time, other operations may be added to these processes, or one or more operations may be removed from these processes. The heating rod detection method 20 includes the following steps:

[0041] S1: Detect the pressure change of the test gas through the airtightness detection module to detect the airtightness of the heating rod;

[0042] S2: Apply test pressure to the heating rod through the water pressure detection module, and maintain the pressure for more than a preset time to detect the water pressure bearing capacity of the heating rod;

[0043] S3: Calibrate each thermocouple through a thermocouple characteristic detection module, where the thermocouple characteristic detection module is suitable for judging whether the thermocouple is qualified under test conditions;

[0044] S4: performing resistance detection on the plurality of heating rods and the heating segments of the plurality of heating rods through a resistance detection module, calculating an average resistance of each heating rod, and determining whether a resistance deviation between each heating rod and the average resistance is qualified;

[0045] S5: Use the X-ray, ultrasonic, infrared and electromagnetic methods of the non-destructive testing module to detect the quality of the heating rod and analyze the location and size of possible defects in the heating rod;

[0046] S6: The specification, quantity, appearance, marking and size of the heating rod are inspected through the structure inspection module.

[0047] This application performs air tightness detection on the heating rod through an air tightness detection module, performs water pressure bearing capacity detection on the heating rod through a water pressure detection module, and detects the thermocouple in the heating rod through a thermocouple characteristic detection module to ensure that the thermocouple can monitor the wall temperature of the heating rod and the CHF transient temperature during the test. Furthermore, the resistance detection module is used to determine whether the resistance of the heating rod is qualified, the non-destructive testing module is used to determine the quality of the heating rod, and the location and size of possible defects in the heating rod are analyzed. Finally, the structural detection module is used to detect the specifications, quantity, etc. of the heating rod to ensure the structural integrity of the heating rod. The above modules can be used to comprehensively and systematically detect the heating rod used for the CHF test, quickly and accurately troubleshoot the quality problems of the heating rod, and intuitively determine whether the heating rod meets the requirements in the three major performance areas of structural integrity, material properties, and electrical properties, ensuring that the heating rod can meet the technical requirements, thereby supporting the implementation of the CHF test.

[0048] The basic concepts have been described above. Obviously, for those skilled in the art, the above application disclosure is only an example and does not constitute a limitation of the present application. Although not explicitly stated herein, those skilled in the art may make various modifications, improvements and amendments to the present application. Such modifications, improvements and amendments are suggested in the present application, so such modifications, improvements and amendments still belong to the spirit and scope of the exemplary embodiments of the present application.

[0049] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "one embodiment", "an embodiment", and / or "some embodiments" refer to a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "one embodiment" or "an embodiment" or "an alternative embodiment" mentioned twice or more in different positions in this specification does not necessarily refer to the same embodiment. In addition, some features, structures or characteristics in one or more embodiments of the present application can be appropriately combined.

[0050] Similarly, it should be noted that in order to simplify the description of the disclosure of this application and thus help understand one or more application embodiments, in the above description of the embodiments of this application, multiple features are sometimes merged into one embodiment, figure or description thereof. However, this disclosure method does not mean that the features required by the object of this application are more than the features mentioned in the claims. In fact, the features of the embodiments are less than all the features of the single embodiment disclosed above.

[0051] In some embodiments, numbers describing the number of components and attributes are used. It should be understood that such numbers used in the description of the embodiments are modified by the modifiers "about", "approximately" or "substantially" in some examples. Unless otherwise specified, "about", "approximately" or "substantially" indicate that the numbers are allowed to vary by ±20%. Accordingly, in some embodiments, the numerical parameters used in the specification and claims are approximate values, which may change according to the required features of individual embodiments. In some embodiments, the numerical parameters should take into account the specified significant digits and adopt the general method of retaining digits. Although the numerical domains and parameters used to confirm the breadth of their range in some embodiments of the present application are approximate values, in specific embodiments, the setting of such numerical values ​​is as accurate as possible within the feasible range.

[0052] Although the present application has been described with reference to the current specific embodiments, ordinary technicians in this technical field should recognize that the above embodiments are only used to illustrate the present application, and various equivalent changes or substitutions may be made without departing from the spirit of the present application. Therefore, as long as the changes and modifications to the above embodiments are within the essential spirit of the present application, they will fall within the scope of the claims of the present application.

Claims

1. A heating rod detection system, suitable for a nuclear reactor, wherein the nuclear reactor comprises a plurality of heating rods, each of the heating rods comprises one or more thermocouples, each of the thermocouples comprises a thermocouple armor and a thermocouple wire, and the heating rods further comprise a heating section, characterized in that: The heating rod detection system includes: An airtightness detection module, wherein the airtightness detection module is adapted to detect the airtightness of the heating rod by detecting the pressure change of the test gas; A water pressure detection module, the water pressure detection module is suitable for applying a test pressure to the heating rod and maintaining the pressure for more than a preset time to detect the water pressure bearing capacity of the heating rod; A thermocouple characteristic detection module, wherein the thermocouple characteristic detection module is suitable for calibrating each of the thermocouples, and the thermocouple characteristic detection module is suitable for judging whether the thermocouple is qualified under test conditions; a resistance detection module, wherein the resistance detection module performs resistance detection on the plurality of heating rods and the heating sections of the plurality of heating rods, calculates an average resistance of each heating rod, and determines whether a resistance deviation between each heating rod and the average resistance is qualified; A non-destructive testing module, which is suitable for testing the quality of the heating rod by means of X-ray, ultrasound, infrared and electromagnetic, and analyzing the position and size of possible defects of the heating rod; A structure detection module, wherein the structure detection module is suitable for detecting the specification, quantity, appearance, marking and size of the heating rod.

2. The detection system according to claim 1, characterized in that: The airtightness detection module is suitable for filling the heating rod with nitrogen and detecting the airtightness of the heating rod, wherein the detection pressure of the nitrogen is the working pressure.

3. The detection system according to claim 1, characterized in that: The test pressure applied by the water pressure detection module to the heating rod is 15MPa to 20MPa, and the preset time is 10min to 15min.

4. The detection system according to claim 1, characterized in that: The thermocouple characteristic detection module is suitable for calibrating each of the thermocouples, and the calibration includes calibrating the temperature and accuracy of the heating rod and the arrangement position of the thermocouple.

5. The detection system according to claim 1, characterized in that: The thermocouple characteristic detection module will perform an insulation test on the thermocouple. The test conditions of the insulation test include placing the heating rod in an environment of 400V~600V test voltage, 15℃~35℃ test temperature, 45%~75% relative humidity and 86kPa~106kPa atmospheric pressure.

6. The detection system according to claim 1, characterized in that: Determining whether the thermocouple is qualified includes determining whether the insulation resistance between the thermocouple wire and the thermocouple armor is greater than or equal to 500 kΩ and determining whether the insulation resistance between the thermocouple armor and the heating rod is greater than or equal to 10 kΩ.

7. The detection system according to claim 1, characterized in that: Determining whether the resistance deviation between each of the heating rods and the average resistor is qualified includes determining whether the resistance deviation between each of the heating rods and the average resistor is less than or equal to ±3%.

8. A heating rod detection method, applicable to a nuclear reactor, wherein the nuclear reactor comprises a plurality of heating rods, each of the heating rods comprises one or more thermocouples, each of the thermocouples comprises a thermocouple armor and a thermocouple wire, and the heating rods further comprise a heating section, characterized in that: The detection method comprises the following steps: Detecting the pressure change of the test gas through the airtightness detection module to detect the airtightness of the heating rod; Applying a test pressure to the heating rod through a water pressure detection module, and maintaining the pressure for more than a preset time to detect the water pressure bearing capacity of the heating rod; Calibrate each of the thermocouples by a thermocouple characteristic detection module, wherein the thermocouple characteristic detection module is suitable for judging whether the thermocouple is qualified under test conditions; The resistance detection module detects the resistance of the plurality of heating rods and the heating sections of the plurality of heating rods, calculates the average resistance of each heating rod, and determines whether the resistance deviation between each heating rod and the average resistance is qualified; The quality of the heating rod is detected by using the X-ray, ultrasonic, infrared and electromagnetic methods of the non-destructive testing module, and the position and size of possible defects of the heating rod are analyzed; The specification, quantity, appearance, marking and size of the heating rod are inspected through a structural inspection module.

9. A nuclear reactor, characterized in that: include: A plurality of heating rods, each of which comprises one or more thermocouples, each of which comprises a thermocouple armor and a thermocouple wire, and the heating rod further comprises a heating section. The heating rod is suitable for detection by the heating rod detection system as described in claims 1 to 7.

10. The nuclear reactor according to claim 9, characterized in that The heating rod also includes an upper conductive tube, a lower conductive tube and a transition conductive tube. The heating section of the heating rod includes an Inconel-600 heating tube and an insulating ceramic block. The thermocouple is located in the Inconel-600 heating tube.

Images