Test method

Abstract

The embodiment of the invention relates to the technical field of analyzing materials by measuring the chemical or physical properties of the materials, in particular to a test method suitable for determining the compatibility between new fuel and new cladding, which comprises the following steps of: processing the new fuel and the new cladding to be used for testing, vacuumizing a reaction space and cleaning by using high-purity inert gas, and determining the compatibility between the new fuel and the new cladding. Placing the treated new fuel and the new cladding together, putting the new fuel and the new cladding into a reaction space, inputting protective gas into the reaction space to reach a first preset pressure, heating the reaction space to a preset temperature, keeping the temperature for a preset time, adjusting the contact force between the new fuel and the new cladding in the heating and heat preservation stages, analyzing the microstructures of the new fuel and the new cladding, and determining the microstructures of the new fuel and the new cladding. The compatibility between the new fuel and the new cladding is determined. According to the method, the interaction relationship between the fuel and the cladding under the actual working condition can be accurately simulated, and the reaction between the new fuel and the new cladding is closer to the actual condition, so that the test precision is improved, and the accuracy and reliability of the obtained test result are enhanced.

Description

Technical Field

[0001] Embodiments of the present application relate to the technical field of analyzing materials by measuring the chemical or physical properties of the materials, and more particularly to a test method. Background Art

[0002] The statements herein merely provide background information related to the present application and do not necessarily constitute prior art.

[0003] The compatibility between fuel and cladding means that during the service of the fuel elements in the reactor, no harmful chemical reactions or physical effects will occur between the fuel and the cladding, which will affect the integrity and safety of the fuel elements. Therefore, selecting fuel and cladding materials with good compatibility is one of the key factors to ensure the safe operation of nuclear reactors.

[0004] In order to determine whether the compatibility of fuel and cladding meets the requirements for safe service in the reactor, it is necessary to test them in advance. However, the current methods for determining the compatibility of fuel and cladding still have many problems such as low test accuracy and low reliability of test results. Summary of the invention

[0005] A brief overview of the present application is provided below in order to provide a basic understanding of certain aspects of the present application. It should be understood that this overview is not an exhaustive overview of the present application. It is not intended to identify the key or important parts of the present application, nor is it intended to limit the scope of the present application. Its purpose is merely to present certain concepts in a simplified form as a prelude to a more detailed description discussed later.

[0006] An embodiment of the present application provides a test method, which is suitable for determining the compatibility between new fuel and new cladding, and includes the following steps: S00: processing new fuel and new cladding so that they can be used for testing; S10: evacuating the reaction space, and then cleaning the reaction space with high-purity inert gas; S20: placing the processed new fuel and new cladding together, and placing them in the reaction space for testing; S30: inputting protective gas into the reaction space to reach a first predetermined pressure; S40: heating the reaction space to a predetermined temperature, and keeping it warm for a predetermined time; S50: adjusting the contact force between the new fuel and the new cladding during the heating stage and the insulation stage; S60: taking the new fuel and the new cladding out of the reaction space, and analyzing the microstructure of the new fuel and the new cladding; S70: determining the compatibility between the new fuel and the new cladding based on the analysis of step S60.

[0007] The test method in the embodiments of the present application simulates the actual pressure and temperature in the reactor, conducts a compatibility test of the new fuel and the new cladding under such conditions, and adjusts the contact force between the new fuel and the new cladding during the heating stage and the insulation stage, so as to accurately simulate the interaction between the fuel and the cladding under actual working conditions, so that the reaction between the new fuel and the new cladding is closer to the actual situation, thereby improving the test accuracy and enhancing the accuracy and reliability of the test results finally obtained by analyzing the microstructure of the new fuel and the new cladding. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Other objects and advantages of the present application will become apparent from the following description of the embodiments of the present application with reference to the accompanying drawings, and will help to provide a comprehensive understanding of the present application.

[0009] Figure 1 is a flow chart of a test method according to one embodiment of the present application;

[0010] Figure 2 It is a schematic diagram of the structure of a test system according to an embodiment of the present application.

[0011] Description of reference numerals:

[0012] 1. New fuel; 2. New cladding; 10. Reaction module; 11. Reaction space; 20. Contact force control module; 21. Pressure rod; 22. Press; 23. Pressure measuring device.

[0013] It should be noted that the drawings are not necessarily drawn to scale, but are merely shown in a schematic manner that does not affect the reader's understanding. DETAILED DESCRIPTION

[0014] Exemplary embodiments of the present application will be described below in conjunction with the accompanying drawings. For the sake of clarity and conciseness, not all features of the actual implementation are described in the specification. However, it should be understood that many implementation-specific decisions must be made in the process of developing any such actual implementation in order to achieve the developer's specific goals, such as meeting those constraints related to the system and business, and these constraints may vary from implementation to implementation. In addition, it should be understood that although the development work may be very complex and time-consuming, it is only a routine task for those skilled in the art who benefit from the content of this application.

[0015] It is also necessary to explain here that, in order to avoid obscuring the present application due to unnecessary details, only the device structure and / or processing steps closely related to the scheme according to the present application are shown in the accompanying drawings, while other details that are not very relevant to the present application are omitted.

[0016] The inventors of the present application have discovered that there is currently no method for determining the compatibility between the fuel and the cladding that can accurately simulate the actual reaction conditions within the reactor and the interaction between the fuel and the cladding under actual operating conditions, resulting in poor test accuracy and affecting the accuracy and reliability of the final test results.

[0017] Based on this, the embodiments of the present application provide a test method suitable for determining the compatibility between new fuel and new cladding, such as Figure 1 As shown, Figure 1 A flow chart showing a test method according to an embodiment of the present application is shown, and the method includes the following steps S10 to S70:

[0018] S00: Processing of new fuel and new cladding to make them usable for testing.

[0019] S10: Evacuate the reaction space, and then use high-purity inert gas to purge the reaction space.

[0020] S20: Place the processed new fuel and the new cladding together and place them into a reaction space for testing.

[0021] S30: Inputting protective gas into the reaction space to reach a first predetermined pressure.

[0022] S40: heating the reaction space to a predetermined temperature and keeping the temperature for a predetermined time.

[0023] S50: During the heating stage and the heat preservation stage, the contact force between the new fuel and the new cladding is adjusted.

[0024] S60: Take out the new fuel and the new cladding from the reaction space, and analyze the microstructure of the new fuel and the new cladding.

[0025] S70: According to the analysis in step S60, the compatibility between the new fuel and the new cladding is determined.

[0026] The method provided in the embodiments of the present application simulates the actual pressure and temperature in the reactor, conducts a compatibility test of the new fuel and the new cladding under such conditions, and adjusts the contact force between the new fuel and the new cladding during the heating stage and the insulation stage, so as to accurately simulate the interaction between the fuel and the cladding under actual working conditions, so that the reaction between the new fuel and the new cladding is closer to the actual situation, thereby improving the test accuracy and enhancing the accuracy and reliability of the test results finally obtained by analyzing the microstructure of the new fuel and the new cladding.

[0027] In some embodiments, in step S00, the new fuel and new cladding are processed to make them consistent with the fuel and cladding actually in service in the reactor, thereby accurately simulating the actual situation of the fuel elements in the reactor and further improving the test accuracy and reliability.

[0028] In some embodiments, in step S00, the new fuel is processed so that the surface roughness and porosity of the new fuel are consistent with those of the fuel serving in the reactor; and the new cladding is preheated to change its organizational structure to be consistent with the cladding serving in the reactor, so as to achieve simulation of the fuel and cladding actually serving in the reactor.

[0029] In step S20, when the processed new fuel and new cladding are placed in the reaction space for the test, multiple new fuels and multiple new claddings can be stacked and placed so that multiple test data can be obtained at the same time under the same contact force conditions, and test results can be obtained based on the multiple test data, thereby reducing errors and improving test accuracy.

[0030] Specifically, when multiple new fuels and multiple new claddings are stacked and placed, one new fuel and one new cladding can be divided into a group to form multiple test groups, and the multiple test groups are stacked and placed in a reaction space for testing, so that the same contact force acts on the multiple test groups at the same time, thereby obtaining multiple test data.

[0031] In some embodiments, in step S40, the first predetermined pressure is adjusted to a second predetermined pressure during the insulation process, and the second predetermined pressure is greater than the first predetermined pressure to increase the reaction rate of the new fuel and the new cladding during the insulation process to ensure that the two react fully, thereby improving the test accuracy and the reliability of the test results.

[0032] In some embodiments, step S50 further includes the following steps:

[0033] S51: Obtain the change data of the contact force between the fuel and the cladding under the actual operating conditions of the reactor.

[0034] S52: According to the contact force change data obtained in step S51, the contact force between the new fuel and the new cladding is adjusted.

[0035] In this embodiment, the contact force variation data between the fuel and the cladding under the actual operating conditions of the reactor is utilized to adjust the contact force between the new fuel and the new cladding accordingly during the test, so as to further accurately simulate the interaction relationship between the fuel and the cladding under the actual operating conditions, thereby further improving the test accuracy and the reliability of the test results.

[0036] In some embodiments, in step S50, the change in temperature of the reaction space under the actual operating conditions of the reactor is obtained, and in the process of adjusting the contact force, the temperature in the reaction space is controlled in the same way as the change in the actual operating conditions of the reactor, so as to further simulate the relationship between the actual reaction temperature of the reactor and the change in the contact force between the fuel and the cladding in the test, so that the reaction between the new fuel and the new cladding is closer to the actual operating conditions and the test accuracy is improved.

[0037] In some embodiments, in step S50, during the heating process, the gas in the new cladding can be replaced. For example, the gas in the cladding can be replaced with helium and trace oxygen to simulate the changes in the gas in the cladding when the fuel elements are serving in the reactor, so that the reaction between the new fuel and the new cladding is closer to the actual operating conditions, so as to improve the test accuracy.

[0038] In some embodiments, in step S00, the new fuel and the new cladding are processed so that gas holes are provided on the new fuel and the new cladding respectively to facilitate the inflow and outflow of gas in the new cladding, thereby facilitating the replacement of the gas in the new cladding in step S50.

[0039] In some embodiments, in step S60, after the new fuel and the new cladding are taken out from the reaction space, the new fuel and the new cladding are placed under a protective atmosphere to prevent the reaction layer from being damaged, which would affect the analysis results of the microstructure of the new fuel and the new cladding, thereby reducing the test accuracy.

[0040] In some embodiments, in step S60, during the analysis process, the new fuel and the new cladding are subjected to non-destructive testing to prevent the new fuel and the new cladding from being destroyed and to be used again for new tests, so as to facilitate multiple tests on the same set of new fuel and new cladding, reduce errors caused by replacing test materials, improve the accuracy of the test, and at the same time reduce the consumption of new fuel and new cladding, thereby improving resource utilization.

[0041] In some embodiments, in step S60, element scanning analysis and phase structure analysis are performed on the new fuel and the new cladding to determine the composition of the new cladding included in the new fuel and the composition of the new fuel included in the new cladding, as well as the influence of the composition of the new fuel on the new cladding and the influence of the composition of the new cladding on the new fuel, so as to determine the degree of interaction between the new fuel and the new cladding, thereby accurately determining the compatibility between the new fuel and the new cladding.

[0042] In step S70, according to the analysis result of step S60, when the content of the components of the new cladding included in the new fuel and the components of the new fuel included in the new cladding are less than the predetermined value, the influence of the components of the new fuel on the new cladding and the influence of the components of the new cladding on the new fuel are less than the predetermined value, the compatibility of the two is good; when the content of the components of the new cladding included in the new fuel and the components of the new fuel included in the new cladding are greater than the predetermined value, the influence of the components of the new fuel on the new cladding and the influence of the components of the new cladding on the new fuel are greater than the predetermined value, the compatibility of the two is poor.

[0043] In step S60, the weight change values ​​of the new fuel and the new cladding before and after the test can also be determined respectively. In step S70, when the weight change values ​​of the new fuel and the new cladding before and after the test are less than a predetermined value, the compatibility of the two is good; when the weight change values ​​of the new fuel and the new cladding before and after the test are greater than a predetermined value, the compatibility of the two is poor.

[0044] The embodiment of the present application also provides a test system suitable for determining the compatibility between new fuel and new cladding, such as Figure 2 As shown, Figure 2 A schematic structural diagram of a test system of an embodiment of the present application is shown, and the test system includes: a processing module, which is configured to process new fuel and new cladding so that they can be used for testing; a reaction module 10, the reaction module 10 forms a reaction space 11, and the new fuel 1 and the new cladding 2 processed by the processing module are placed in the reaction space 11 for testing; a protective gas supply module, the protective gas supply module inputs protective gas to the reaction space 11 to a first predetermined pressure; a heating module, the heating module is configured to heat the reaction space 11 to a predetermined temperature; a contact force control module 20, the contact force control module 20 is configured to adjust the contact force between the new fuel 1 and the new cladding 2; an analysis module, the analysis module is configured to analyze the microstructure of the new fuel and the new cladding, and based on the analysis results, determine the compatibility between the new fuel and the new cladding.

[0045] The system provided in the embodiments of the present application can simulate the actual pressure and temperature within the reactor, and conduct compatibility tests on new fuel and new cladding under such conditions. In addition, the contact force between the new fuel and the new cladding can be adjusted to accurately simulate the interaction between the fuel and the cladding under actual operating conditions, so that the reaction between the new fuel and the new cladding is closer to the actual situation, thereby improving the test accuracy and enhancing the accuracy and reliability of the test results ultimately obtained by analyzing the microstructure of the new fuel and the new cladding.

[0046] The contact force control module 20 includes a pressure rod 21, a press 22 and a pressure measuring device 23. The pressure rod 21 is configured to provide pressure to the new fuel 1 and the new cladding 2 to change the contact force between the new fuel 1 and the new cladding 2; the press 22 is used to pressurize the pressure rod 21 so that the pressure rod 21 provides pressure to the new fuel 1 and the new cladding 2; the pressure measuring device 23 is configured to measure the pressure provided by the pressure rod 21 to the new fuel 1 and the new cladding 2 to determine the change in the contact force between the new fuel 1 and the new cladding 2.

[0047] The process of determining the compatibility between the fuel and the cladding in the present application is further explained below with reference to specific examples.

[0048] Treat the new fuel so that the surface roughness and porosity of the new fuel are consistent with those of the fuel in service in the reactor, preheat the new cladding to change its organizational structure so that it is consistent with the cladding in service in the reactor; evacuate the reaction space, and then use high-purity inert gas to clean the reaction space; divide the treated new fuel and one new fuel and one new cladding in the new cladding into a group to form multiple test groups, and stack the multiple test groups and put them into the reaction space for testing; input protective gas to the reaction space to reach 1-2Mpa; heat the reaction space, and during the heating process, replace the gas in the new cladding according to the change of gas in the cladding when the fuel element is in service in the reactor; after the temperature of the reaction space reaches 1100K, keep it warm for a predetermined time, and pressurize the reaction space during the insulation process; obtain the change data of the contact force between the fuel and the cladding under the actual operating conditions of the reactor, and according to the change data, during the heating stage and During the heat preservation stage, the contact force between the new fuel and the new cladding is adjusted within the range of 1N to 10N; the new fuel and the new cladding are taken out of the reaction space, and the microstructures of the new fuel and the new cladding are subjected to element scanning analysis and phase structure analysis under a protective atmosphere to determine the components of the new cladding included in the new fuel and the components of the new fuel included in the new cladding, as well as the influence of the components of the new fuel on the new cladding and the influence of the components of the new cladding on the new fuel; when the contents of the components of the new cladding included in the new fuel and the components of the new fuel included in the new cladding are less than a predetermined value, and the influence of the components of the new fuel on the new cladding and the influence of the components of the new cladding on the new fuel are less than a predetermined value, the two have good compatibility; when the contents of the components of the new cladding included in the new fuel and the components of the new fuel included in the new cladding are greater than a predetermined value, and the influence of the components of the new fuel on the new cladding and the influence of the components of the new cladding on the new fuel are greater than a predetermined value, the two have poor compatibility.

[0049] Regarding the embodiments of the present application, it should also be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other to obtain new embodiments.

[0050] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. The protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A test method suitable for determining the compatibility between new fuel and new cladding, characterized in that: It includes the following steps: S00: processing the new fuel and the new cladding so as to enable them to be used for the test; S10: evacuating the reaction space, and then purging the reaction space with a high-purity inert gas; S20: placing the processed new fuel and the new cladding together and placing them into a reaction space for testing; S30: inputting protective gas into the reaction space to reach a first predetermined pressure; S40: heating the reaction space to a predetermined temperature and keeping the temperature for a predetermined time; S50: During the heating stage and the heat preservation stage, adjusting the contact force between the new fuel and the new cladding; S60: taking out the new fuel and the new cladding from the reaction space, and analyzing the microstructures of the new fuel and the new cladding; S70: According to the analysis in step S60, the compatibility between the new fuel and the new cladding is determined.

2. The test method according to claim 1, characterized in that In the step S00, the new fuel and the new cladding are processed to make them consistent with the fuel and cladding actually in service in the reactor.

3. The test method according to claim 2, characterized in that: In the step S00, the new fuel is processed so that the surface roughness and porosity of the new fuel are consistent with those of the fuel in service in the reactor; In the step S00, the new cladding is preheated to change its organizational structure so that it is consistent with the cladding in service in the reactor.

4. The test method according to claim 1, characterized in that: In step S40, during the heat preservation process, the first predetermined pressure is adjusted to a second predetermined pressure, and the second predetermined pressure is greater than the first predetermined pressure.

5. The test method according to claim 1, characterized in that: The step S50 also includes the following steps: S51: Obtaining the change data of the contact force between the fuel and the cladding under the actual operating conditions of the reactor; S52: According to the contact force change data obtained in step S51, the contact force between the new fuel and the new cladding is adjusted.

6. The test method according to claim 5, characterized in that In step S50, the change of the temperature of the reaction space under the actual operating condition of the reactor is obtained, and in the process of adjusting the contact force, the temperature in the reaction space is controlled in the same control manner as the change of the actual operating condition of the reactor.

7. The test method according to claim 1, characterized in that: In step S50, during the heating process, the gas in the new cladding can be replaced.

8. The test method according to claim 7, characterized in that: In step S00, the new fuel and the new cladding are processed so that air holes are respectively provided on the new fuel and the new cladding.

9. The test method according to claim 1, characterized in that: In step S60, after the new fuel and the new cladding are taken out from the reaction space, the new fuel and the new cladding are placed under a protective atmosphere to prevent the reaction layer from being damaged.

10. The test method according to claim 1, characterized in that: In step S60, during the analysis process, the new fuel and the new cladding are subjected to non-destructive testing to prevent the new fuel and the new cladding from being destroyed and to be used again for new tests.

11. The test method according to claim 10, characterized in that: In step S60, element scanning analysis and phase structure analysis are performed on the new fuel and the new cladding to determine the composition of the new cladding included in the new fuel and the composition of the new fuel included in the new cladding, as well as the influence of the composition of the new fuel on the new cladding and the influence of the composition of the new cladding on the new fuel.

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