Reactor irradiation loading fixture for zirconium alloy plate surface coating samples

Abstract

This application belongs to the field of materials irradiation technology, specifically relating to a reactor irradiation sample loading device for zirconium alloy plate surface coating samples. The device includes: an upper cover plate and a sample loading seat; the upper cover plate and sample loading seat cooperate with each other to fix and load the coating sample; the upper cover plate is mounted on the upper side of the sample loading seat, and its lower surface has a first protrusion that fixes the coating sample to move parallel to the upper cover plate; the upper side of the sample loading seat has a groove for placing the sample, and second protrusions are fixed on both sides of the groove to fix the movement of the coating sample perpendicular to the upper cover plate. This device ensures that the sample is not damaged by mechanical forces or vibrations during loading before entering the reactor, irradiation inside the reactor, and transfer and extraction after leaving the reactor. This provides a strong guarantee for the accurate characterization and analysis of the microstructure, structure, and macroscopic properties of the coating sample tested under actual reactor conditions. Furthermore, the device is simple in structure and convenient for installation, use, and sampling.

Description

Technical Field

[0001] This application belongs to the field of materials irradiation technology, specifically relating to a reactor irradiation sample loading device for a zirconium alloy plate surface coating sample. Background Technology

[0002] In nuclear accidents, the zirconium alloy cladding in the reactor core reacts violently with high-temperature steam, releasing large amounts of hydrogen and heat, ultimately leading to core meltdown and a hydrogen buildup explosion. Therefore, accident-tolerant fuel (ATF) research has become a hot research area in nuclear materials science. Its main goal is to design high-performance fuel systems that can withstand high temperatures under Loss-of-Cooldown Accident (LOCA) and Over-Design-Balance-Accident (BDBA) conditions, prevent the release of fission products for a certain period, keep combustible gas production within permissible limits, and maintain core cooling capacity. This reduces the probability of severe reactor accidents, mitigates their consequences, and further improves reactor safety. An important branch of ATF research involves preparing protective coatings on the zirconium alloy surface to improve the high-temperature oxidation and corrosion resistance of commercial zirconium alloy cladding.

[0003] Initial research on the preparation of protective coatings for zirconium alloy surfaces primarily focused on off-core performance, including simulating neutron irradiation experiments with ion irradiation, simulating in-core water chemistry and high-temperature, high-pressure corrosion experiments in an autoclave, and simulating loss-of-coolant accidents using a high-temperature experimental furnace. Ultimately, coating samples demonstrating excellent off-core performance in these tests will undergo experimental verification under actual reactor operating conditions.

[0004] In order to accurately characterize and analyze the microstructure, structure and macroscopic properties of the coating samples tested under actual reactor conditions, the samples are prone to mechanical damage and vibration damage during loading before entering the reactor, irradiation inside the reactor and transfer and extraction after leaving the reactor, and the integrity of their surface and cross-section cannot be guaranteed. Summary of the Invention

[0005] The purpose of this application is to provide a reactor irradiation sample loading device for zirconium alloy plate surface coating samples, which solves the problems of easy mechanical damage and vibration damage to samples during the loading of samples before entering the reactor, irradiation in the reactor, and transfer and extraction after leaving the reactor in the prior art, and ensures the integrity of the sample surface and cross section.

[0006] The technical solution to achieve the purpose of this application is as follows:

[0007] This application provides a reactor irradiation sample loading device for zirconium alloy plate surface coating samples. The device includes: an upper cover plate and a sample loading base.

[0008] The top cover and the sample holder fit together to fix and install the coating sample;

[0009] The upper cover plate is installed on the upper side of the sample holder, and the lower surface has a first protrusion that fixes the coated sample to move in a direction parallel to the upper cover plate;

[0010] The upper side of the sample holder has a groove for placing the sample, and a second protrusion is fixed on both sides of the groove to fix the movement of the coating sample in a direction perpendicular to the upper cover plate.

[0011] Optionally, the coating sample is rectangular and has third protrusions on both sides to fit the sample.

[0012] The lower part of the groove has a concave groove for the third protrusion to slide into.

[0013] Optionally, the concave groove is provided with a sample positioning mark to mark the installation position of the coating sample.

[0014] Optionally, the side of the first bump closest to the coated sample is a slope.

[0015] Optionally, the coating sample has cross-sections that mate with the first protrusions on both sides; at least four first protrusions are fixed on the lower surface of the upper cover plate, respectively fixed to the front, rear, left and right sides of the coating sample.

[0016] Optionally, the sample holder is provided with two diagonally distributed fixing screw holes; the upper cover plate is fixed to the fixing screw holes by bolts.

[0017] Optionally, the bolt fixing points of the top cover and the sample holder adopt a semi-circular contact design.

[0018] Optionally, the device contains multiple coating samples, with a spacing of not less than 15 mm between two adjacent coating samples.

[0019] Optionally, the device is made of aluminum alloy or zirconium alloy.

[0020] Optionally, the coating area on the surface of the coated sample is square, with an area of ​​25 mm². 2 The length, width, and height of the third protrusion are 5mm, 1.5mm, and 0.5mm, respectively.

[0021] The beneficial technical effects of this application are as follows:

[0022] This application provides a reactor irradiation sample loading device for zirconium alloy plate surface coating samples. During sample loading, a sample positioning mark is used to effectively position the coating sample. The upper cover plate with fixing protrusions on its lower surface and the sample loading seat with fixing protrusions on both sides of the groove can cooperate to completely fix the coating sample from four directions (up, down, left, and right) without contacting the surface or cross-section of the coating sample. This ensures that the sample is not damaged by mechanical forces or vibrations during pre-reactor loading, reactor irradiation, and reactor transport and extraction. This provides a strong guarantee for the accurate characterization and analysis of the microstructure, structure, and macroscopic properties of the coating sample tested under actual reactor conditions. Furthermore, the device is simple in structure, easy to install, use, and sample. Attached Figure Description

[0023] Figure 1 A schematic diagram of a reactor irradiation sample loading device for a zirconium alloy plate surface coating sample provided in this application embodiment;

[0024] Figure 2 This application provides a schematic diagram of the structure of a coating sample in a reactor irradiation sample loading device for an alloy plate surface coating sample;

[0025] Figure 3 This application provides a schematic diagram of the sample holder in a reactor irradiation sample loading device for a zirconium alloy plate surface coating sample;

[0026] Figure 4 A schematic diagram of the structure of the upper cover plate in a reactor irradiation sample loading device for a zirconium alloy plate surface coating sample provided in this application embodiment;

[0027] Figure 5 This application provides a side sectional view of the upper cover plate in a reactor irradiation sample loading device for a zirconium alloy plate surface coating sample;

[0028] Figure 6 This application provides an AA cross-sectional view of the upper cover plate in a reactor irradiation sample loading device for a zirconium alloy plate surface coating sample.

[0029] In the picture:

[0030] 1-Top cover plate; 11-First protrusion;

[0031] 2-Sample holder; 21-Groove; 22-Second protrusion; 23-Concave groove; 24-Sample positioning mark; 25-Fixing screw hole;

[0032] 3-Coated sample; 31-Third bump;

[0033] 4- Bolts. Detailed Implementation

[0034] To enable those skilled in the art to better understand this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are only a part of the embodiments of this application, and not all of them. Based on the embodiments described in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0035] See Figure 1 The figure is a schematic diagram of the reactor irradiation sample loading device for a zirconium alloy plate surface coating sample provided in an embodiment of this application.

[0036] The reactor irradiation sample loading device for zirconium alloy plate surface coating samples provided in this application embodiment includes: an upper cover plate 1 and a sample loading seat 2;

[0037] The upper cover plate 1 and the sample holder 2 cooperate with each other to fix and install the coating sample 3;

[0038] The upper cover plate 1 is installed on the upper side of the sample holder 2, and the lower surface has a first protrusion 11 that fixes the coated sample 3 to move in a direction parallel to the upper cover plate 1;

[0039] The upper side of the sample holder 2 has a groove 21 for placing the coating sample 3. The groove 21 has a second protrusion 22 fixed on both sides for fixing the movement of the coating sample 3 in a direction perpendicular to the upper cover plate 1.

[0040] In this embodiment, the upper cover plate 1 and the sample holder 2 cooperate with each other to fix and install the coating sample 3. The coating sample 3 is placed in the groove 21. The second protrusion 22 of the first protrusion 11 fixes the coating sample 3 to move in directions parallel to and perpendicular to the upper cover plate 1, ensuring that the coating sample 3 is completely fixed from four directions (up, down, left, and right) without contacting the surface and cross-section of the coating sample 3. This can completely fix the coating sample in the device and prevent damage or friction to the surface and cross-section of the coating sample 3.

[0041] In practical implementation, the sample holder 2 can be provided with two diagonally distributed fixing screw holes 25; the upper cover plate 1 is fixed to the fixing screw holes 25 by bolts 4. The upper cover plate 1 and the sample holder 2 are connected as a whole by bolts 4 and fixing screw holes 25.

[0042] In a specific example, the bolt fixing points of the upper cover plate 1 and the sample holder 2 adopt a semi-circular arc contact design, which facilitates cutting and disassembly within the hot chamber.

[0043] In some possible implementations of the embodiments of this application, such as Figure 2 and Figure 3As shown, the coating sample 3 is rectangular and has third protrusions 31 on both sides to fit the sample.

[0044] The lower part of the groove 21 is provided with a concave groove 23 for the third protrusion 31 to slide into.

[0045] As an example, the coating area on the surface of coating sample 3 is square, with an area of ​​25 mm². 2 The length, width, and height of the third protrusion 31 are 5mm, 1.5mm, and 0.5mm, respectively.

[0046] In one example, a sample positioning mark 24 is provided on the concave groove 23 to mark the installation position of the coating sample 3.

[0047] In another example, the side of the first protrusion 11 closest to the coating sample 3 is beveled, which can prevent damage or friction to the surface and cross-section of the coating sample 3.

[0048] In some possible implementations of the embodiments of this application, such as Figure 4-6 As shown, the coating sample 3 has cross sections that mate with the first protrusion 11 on both sides; at least four first protrusions 11 are fixed on the lower surface of the upper cover plate 1, respectively fixed to the front, rear, left and right sides of the coating sample 3.

[0049] In some possible implementations of the embodiments of this application, the device has multiple coating samples 3 fixed inside, and the distance between two adjacent coating samples 3 is not less than 15 mm, so that they can be removed by a robot or tweezers in a hot chamber or shielded glove box after irradiation. Figure 1 and Figure 6 An example is shown where three coating samples 3 are fixed in the device. The device can fix three coating samples 3 at a time, so there are three second protrusions 22 on each side of the groove 21 of the sample holder 2, for a total of six second protrusions 22; and twelve first protrusions 11 are fixed on the lower surface of the upper cover plate 1.

[0050] In practice, the device is made of aluminum alloy or zirconium alloy.

[0051] The following detailed description, using a specific example, illustrates the detailed structure and usage of a reactor irradiation sample loading device for a zirconium alloy plate surface coating sample provided in this application embodiment.

[0052] This application provides a reactor irradiation sample loading device for a zirconium alloy plate surface coating sample, including an upper cover plate 1 and a sample loading seat 2 that cooperate with each other to fix and install the coating sample 3. The sample loading seat 2 has a groove 21 for placing the sample on the side near the lower surface of the upper cover plate 1. On the lower surface of the upper cover plate 1 near the sample loading seat 2, there is a first protrusion 11 that fixes the sample to move in a direction parallel to the upper cover plate. On both sides of the groove 21 where the sample is placed, there are second protrusions 22 that fix the coating sample 3 to move in a direction perpendicular to the upper cover plate 1. The coating sample 3 is rectangular and has a third protrusion 31 on both sides for loading. The groove 21 of the sample loading seat 2 is provided with a sample loading concave groove 23 on both sides and a sample loading positioning mark 24. Bolts 4 and fixing screw holes 25 are used to connect the upper cover plate 1 and the sample loading seat 2.

[0053] In practical use, the operator first places the top cover plate 1, sample holder 2, coating sample 3, and bolts 4 on the table. After fixing the sample holder 2, the coating sample 3 is slid into the sample mounting grooves 23 on both sides of the groove 21 of the sample holder 2, aligning it with the corresponding sample positioning mark 24. All three samples are slid in sequentially in this manner. The top cover plate 1 is then installed, so that the top cover plate 1 with the fixing first protrusion 11 on its lower surface and the sample holder 2 with the fixing second protrusions 22 on both sides of the groove 21 are closed, ensuring that the coating sample 3 is completely fixed from four directions (top, bottom, left, and right). Care should be taken during this process to prevent damage or friction to the surface and cross-section of the coating sample 3. Finally, the top cover plate 1 and the sample holder 2 are connected as a whole using bolts 4 and fixing screw holes 25.

[0054] The device containing coating sample 3 was transferred to the hot chamber, and then from the hot chamber to the reactor for loop irradiation or pore irradiation tests. After the irradiation test was completed, the device was transferred out of the reactor and into the hot chamber, where the surface dose rate was measured. Depending on the surface dose rate value, disassembly was performed in either the hot chamber or a shielded glove box. The bolt fixing points of the upper cover plate 1 and the sample holder 2 adopted a semi-circular contact design to facilitate cutting and disassembly within the hot chamber. After removing coating sample 3, it was transported to the laboratory via a special transport container for subsequent experiments and microstructure characterization.

[0055] The present application has been described in detail above with reference to the accompanying drawings and embodiments. However, the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present application. All content not described in detail in this application can be derived from existing technology.

Claims

1. A reactor irradiation sample loading device for a zirconium alloy plate surface coating sample, characterized in that, The device includes: an upper cover plate (1) and a sample holder (2); The upper cover plate (1) and the sample holder (2) cooperate with each other and are used to fix and install the coating sample (3); The upper cover plate (1) is installed on the upper side of the sample holder (2), and the lower surface has a first protrusion (11) that fixes the coated sample (3) to move in a direction parallel to the upper cover plate (1). The sample holder (2) has a groove (21) on its upper side for placing the coating sample (3). A second protrusion (22) is fixed on both sides of the groove (21) to fix the movement of the coating sample (3) in a direction perpendicular to the upper cover plate (1). The coating sample (3) is rectangular and has a third protrusion (31) on both sides to fit the sample. The lower part of the groove (21) is provided with a concave groove (23) for the third protrusion (31) to slide into. A sample positioning mark (24) is provided on the concave groove (23) to mark the installation position of the coating sample (3); The side of the first protrusion (11) closest to the coating sample (3) is a slope; The coating sample (3) has cross sections that fit the first protrusion (11) on both sides; at least four first protrusions (11) are fixed on the lower surface of the upper cover plate (1), respectively fixed on the front, rear, left and right sides of the coating sample (3).

2. The reactor irradiation sample loading device for zirconium alloy plate surface coating samples according to claim 1, characterized in that, The sample holder (2) is provided with two fixed screw holes (25) arranged diagonally; the upper cover plate (1) is fixed to the fixed screw holes (25) by bolts (4).

3. The reactor irradiation sample loading device for zirconium alloy plate surface coating samples according to claim 2, characterized in that, The bolt fixing points of the upper cover plate (1) and the sample holder (2) adopt a semi-circular arc contact design.

4. The reactor irradiation sample loading apparatus for zirconium alloy plate surface coating samples according to any one of claims 1-3, characterized in that, The device contains multiple coating samples (3), and the distance between two adjacent coating samples (3) is not less than 15 mm.

5. The reactor irradiation sample loading apparatus for zirconium alloy plate surface coating samples according to any one of claims 1-3, characterized in that, The device is made of aluminum alloy or zirconium alloy.

6. The reactor irradiation sample loading device for zirconium alloy plate surface coating samples according to claim 1, characterized in that, The coating area on the surface of sample (3) is square, with an area of ​​25 mm². 2 The length, width and height of the third protrusion (31) are 5mm, 1.5mm and 0.5mm respectively.

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