CN109461509B - Inert matrix dispersion fuel pellet and preparation method thereof - Google Patents
Inert matrix dispersion fuel pellet and preparation method thereof Download PDFInfo
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- CN109461509B CN109461509B CN201811152057.8A CN201811152057A CN109461509B CN 109461509 B CN109461509 B CN 109461509B CN 201811152057 A CN201811152057 A CN 201811152057A CN 109461509 B CN109461509 B CN 109461509B
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C21/00—Apparatus or processes specially adapted to the manufacture of reactors or parts thereof
- G21C21/02—Manufacture of fuel elements or breeder elements contained in non-active casings
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C3/00—Reactor fuel elements and their assemblies; Selection of substances for use as reactor fuel elements
- G21C3/42—Selection of substances for use as reactor fuel
- G21C3/58—Solid reactor fuel Pellets made of fissile material
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The invention discloses an inert matrix dispersion fuel pellet and a preparation method thereof, wherein the preparation method comprises the following steps: s1, prefabricating a fuel-free area: pressing the SiC mixed powder into a cylinder and a wafer respectively and sintering under no pressure; s2, a pre-fuel area: pressing the TRISO particles with the SiC coating layer into a cylinder; s3, putting the cylinder into a cylinder, respectively placing wafers at two opposite ends of the cylinder, and sintering by using discharge plasma to obtain inert matrix dispersion fuel pellets; the cylinder forms a fuel zone in which the inert matrix disperses the fuel pellets, and the cylinder and the disc form a fuel-free zone in which the inert matrix disperses the fuel pellets. The preparation method of the invention prefabricates the fuel-free area, controls the density of the fuel-free area to be close to the density of the fuel-free area after being pressed, reduces the density difference between the fuel area and the fuel-free area in the sintered pellet, improves the peripheral outline structure of the TRISO particles in the fuel area, enlarges the fuel area, improves the integral TRISO volume content of the pellet and further improves the comprehensive performance of the inert-based fuel.
Description
Technical Field
The invention relates to the technical field of nuclear fuel, in particular to an inert matrix dispersion fuel pellet and a preparation method thereof.
Background
High nuclear fuel energy density, CO2And the emission of harmful gases is less, and the method is an important means for solving the problems of shortage of petrochemical resources and serious environmental pollution. The nuclear power generation is clean energy, the advantages of the nuclear power are obvious, and the nuclear power generation position is more prominent along with the continuous increase of the proportion of nuclear power energy. However, nuclear energy is energy generated by fission of a heavy metal element such as uranium, and fission products having a certain radioactivity are formed. Therefore, the key of nuclear power safety is to make radiation protection and prevent radioactive products from leaking, and the prerequisite of nuclear energy development is also provided. Many nuclear radioactive leakage events occur on the roads for peacefully utilizing nuclear energy of human beings, in particular to Japanese blessing in 2011Nuclear power accident in island, and promotion of traditional UO2Accident tolerance of-Zr alloy system fuel assemblies is a focus of attention.
UO2High melting point, small radiation swelling, but low thermal conductivity, and poor containment capability of fission gases under deep burnup. UO2 pellets of low thermal conductivity make UO2The Zr-fuel system forms a large temperature gradient during operation, the UO of the fuel rod2The core temperature of the pellets reaches above 1500 ℃. The core temperature of the pellets is high, the rate of fission gas release is high, and the high temperature gradient causes thermal stress to the pellets, reducing the safety of the fuel element. In addition, under the operating condition of loss of coolant accident, the higher the temperature of the core of the pellet is, the more energy is transferred to the cladding of the fuel rod, and the larger the amount of released fission gas is, the higher the risk of breakage of the cladding of the fuel rod is, and even the core melting is caused. Therefore, the development of advanced nuclear fuels and the research on nuclear fuel pellets with high thermal conductivity and low fission gas release rate are the key to improve the accident tolerance of nuclear reactor fuel elements.
IMDP is an important research direction for accident fault-tolerant fuel pellets by using TRISO microspheres as nuclear fuel carriers and taking reference of a high-temperature gas cooled reactor fuel sphere technology to disperse the TRISO microspheres in SiC matrixes. In the IMDP core block, a high-thermal-conductivity SiC matrix coats the TRISO microspheres, so that the integrity of the TRISO microspheres is protected, and heat is efficiently conducted. Moreover, the special structural design of the TRISO particles and the IMDP ensures that the pellets inhibit the release of fission gases under deep burnup. The SiC matrix of the IMDP nuclear fuel pellet has high melting point and high thermal conductivity, and the release rate of the TRISO microsphere fission gas is low, so that the accident fault tolerance of the fuel element is improved.
The IMDP pellet is prepared by dispersing TRISO microspheres in a SiC matrix of powder, and the American oak ridge national laboratory adopts a hot-pressing sintering method to mix TRISO particles and SiC powder and then carry out hot-pressing sintering, so that the process is mature, and the thermal conductivity is improved to a certain extent compared with that of a pure UO2 pellet, but the method has some defects: (1) the green body pressing process is difficult, and particularly, the fuel-free area of the outer layer cannot be tightly combined with the fuel area; (2) the sintering temperature is high, which is not beneficial to improving the comprehensive performance of the core block.
Disclosure of Invention
The invention aims to provide a preparation method of an inert matrix dispersion fuel pellet for improving the comprehensive performance of the fuel pellet and the prepared inert matrix dispersion fuel pellet.
The technical scheme adopted by the invention for solving the technical problems is as follows: a preparation method of an inert matrix dispersion fuel pellet is provided, which comprises the following steps:
s1, prefabricating a fuel-free area: pressing the SiC mixed powder into a cylinder and a wafer respectively and sintering under no pressure;
s2, a pre-fuel area: pressing the TRISO particles with the SiC coating layer into a cylinder;
s3, the cylinder is arranged in the cylinder body, the round pieces are respectively arranged at the two opposite ends of the cylinder body, and the inert matrix dispersion fuel pellet is prepared by discharge plasma sintering;
the cylinder forms a fuel zone of the inert matrix-dispersed fuel pellets, and the cylinder and disc form a fuel-free zone of the inert matrix-dispersed fuel pellets.
Preferably, in step S1, the density of the pressureless sintered cylinder and the disk is 60% to 80%, respectively.
Preferably, in step S1, the cylinder and the wafer are covered with SiC powder during pressureless sintering.
Preferably, the wall thickness of the cylindrical body is 3-5mm, and the thickness of the circular plate is 2-3 mm.
Preferably, the diameter of the disc is equal to the outer diameter of the cylindrical body; the outer diameter of the cylinder is equal to the inner diameter of the cylinder.
Preferably, in step S3, in the spark plasma sintering, the sintering temperature is 1600-.
Preferably, the preparation method further comprises the following steps:
s0, mixing the sintering aid, the SiC powder and the dispersing agent to obtain uniformly dispersed SiC mixed slurry;
step S1 includes:
s1.1, drying the SiC mixed slurry to form SiC mixed powder;
s1.2, pressing the SiC mixed powder into a cylinder and a wafer respectively;
s1.3, sintering the cylinder and the wafer under a pressureless condition.
Preferably, step S2 includes:
s2.1, taking the SiC mixed slurry and spraying the SiC mixed slurry on the surface of TRISO particles, and drying to form a SiC coating layer on the TRISO particles;
s2.2, pressing the TRISO particles with the SiC coating layer into a cylinder under the pressure of 20-40 MPa.
The invention provides another preparation method of an inert matrix dispersion fuel pellet, which comprises the following steps:
s1, prefabricating a fuel-free area: pressing the SiC mixed powder into a cylinder and a wafer respectively and sintering under no pressure;
s2, filling TRISO particles with SiC coating layers into the cylinder body, and pressing the TRISO particles in the cylinder body to form a cylinder;
s3, respectively placing the round pieces at two opposite ends of the cylinder body, and sintering by using discharge plasma to obtain inert matrix dispersion fuel pellets;
the cylinder forms a fuel zone of the inert matrix-dispersed fuel pellets, and the cylinder and disc form a fuel-free zone of the inert matrix-dispersed fuel pellets.
Preferably, in step S1, the density of the pressureless sintered cylinder and the density of the wafer are 60% -80% respectively;
during pressureless sintering, the cylinder and the wafer are covered with SiC powder.
Preferably, the wall thickness of the cylindrical body is 3-5mm, and the thickness of the circular plate is 2-3 mm.
Preferably, in step S3, in the spark plasma sintering, the sintering temperature is 1600-.
Preferably, the preparation method further comprises the following steps:
s0, mixing the sintering aid, the SiC powder and the dispersing agent to obtain uniformly dispersed SiC mixed slurry;
step S1 includes:
s1.1, drying the SiC mixed slurry to form SiC mixed powder;
s1.2, pressing the SiC mixed powder into a cylinder and a wafer respectively;
s1.3, sintering the cylinder and the wafer under a pressureless condition.
Preferably, step S2 includes:
s2.1, taking the SiC mixed slurry and spraying the SiC mixed slurry on the surface of TRISO particles, and drying to form a SiC coating layer on the TRISO particles;
s2.2, filling the TRISO particles with the SiC coating layer into the cylinder, and pressing the TRISO particles in the cylinder to form a cylinder under the pressure of 20-40 MPa.
The invention also provides an inert matrix dispersion fuel pellet which is prepared by adopting any one of the preparation methods.
The invention has the beneficial effects that: the density of the fuel-free area is controlled to be close to the density of the fuel-free area after being pressed, the density difference between the matrix density of the fuel area and the density of the fuel-free area in the inert matrix dispersed fuel pellet after sintering is reduced, the peripheral outline structure of TRISO (trigeminal-isotropic, referred to as TRISO) particles in the fuel area is improved, the fuel area is expanded as much as possible, the volume content of the TRISO in the whole pellet is improved, and the comprehensive performance of the inert matrix fuel is further improved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a flow chart of a method of making a first embodiment of the present invention;
FIG. 2 is a three-dimensional perspective view of CT of a pellet made by the method of making according to the first embodiment of the invention;
fig. 3 is a flow chart of a method of making a second embodiment of the present invention.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the method for preparing inert matrix-dispersed fuel pellets according to the first embodiment of the present invention may include the steps of:
and S0, mixing the sintering aid, the SiC powder and the dispersing agent according to a preset proportion to obtain uniformly dispersed SiC mixed slurry.
The prepared SiC mixed slurry is used for the raw materials of a subsequent fuel-free zone and a fuel zone.
S1, prefabricating a fuel-free area: pressing the SiC mixed powder into a cylinder and a wafer respectively and sintering without pressure.
Step S1 may further include:
and S1.1, drying the SiC mixed slurry prepared in the step S0 to form SiC mixed powder.
S1.2, pressing the SiC mixed powder into a cylinder and a wafer respectively.
Two disks are disposed corresponding to one cylinder.
S1.3, sintering the cylinder and the wafer under a pressureless condition to densify the cylinder and the wafer.
In step S1, the wall thickness of the pressed cylinder may be 3-5mm, and the thickness of the disc may be 2-3 mm.
The density of the cylinder and the disc after pressureless sintering is controlled to be 60-80 percent respectively, so that the density of the cylinder and the disc is close to or the same as that of the fuel area of the pellet, and the density difference between the cylinder and the disc is reduced.
And during pressureless sintering, controlling the sintering temperature according to the required density of the cylinder and the wafer, so that the density of the sintered cylinder and the wafer is in a required range.
During pressureless sintering, SiC powder is covered on the cylinder body and the wafer, and the volatilization of various auxiliary agents in the SiC mixed powder is mainly reduced or prevented.
S2, a pre-fuel area: the TRISO particles with SiC coating were pressed into cylinders.
The pressure for pressing the TRISO particles with the SiC coating into a cylinder is 20-40 MPa. In the cylinder, the SiC coating forms a matrix in which the TRISO particles are dispersed; the content of TRISO particles in the cylinder is 40-60%. The density of the cylinders is 40-50%.
Step S2 may further include:
s2.1, taking the SiC mixed slurry prepared in the step S0, spraying the SiC mixed slurry on the surfaces of the TRISO particles, and drying to form SiC coating layers on the TRISO particles.
S2.2, pressing the TRISO particles with the SiC coating layer into a cylinder under the pressure of 20-40 MPa.
The cylinder is dimensioned to correspond to the cylinder, e.g. the outer diameter of the cylinder is equal to or slightly smaller than the inner diameter of the cylinder, and the height of the cylinder is equal to the height of the cylinder.
And S3, putting the cylinder into the cylinder, respectively placing the circular sheets at the two opposite ends of the cylinder, and sintering by using discharge plasma to obtain the inert matrix dispersion fuel pellet.
The cylinder forms a fuel zone in which the inert matrix disperses the fuel pellets, and the cylinder and the disc form a fuel-free zone in which the inert matrix disperses the fuel pellets.
The diameter of the wafer is equal to the outer diameter of the cylinder, and the wafer covers the cylinder and the cylinder inside the cylinder at the end part of the cylinder. The outer diameter of the cylinder corresponds to the inner diameter of the cylinder so that the cylinder fits snugly within the cylinder.
Spark plasma sintering is performed in a graphite mold. When the discharge plasma is sintered, the sintering temperature is 1600-2000 ℃, the sintering pressure is 10-50MPa, and the heat preservation time is 5-20 min. And after sintering, cooling along with the furnace to obtain the inert matrix dispersion fuel pellet.
Because the fuel-free area is prefabricated and formed firstly, when the discharge plasma is sintered, the fuel-free area plays a role in restraining TRISO particles in the fuel area, and the distribution peripheral outline of the TRISO particles in the sintered pellets is more regular. As shown in fig. 2, which shows a three-dimensional perspective view of CT of the pellets obtained by the preparation method of this example, it can be seen that the external contour of the TRISO particles is more regular, mainly because the density of the fuel-free region is higher, so that the TRISO particles are restrained and prevented from moving to the fuel-free region.
As shown in fig. 3, the method for preparing inert matrix-dispersed fuel pellets according to the second embodiment of the present invention may include the steps of:
and S0, mixing the sintering aid, the SiC powder and the dispersing agent according to a preset proportion to obtain uniformly dispersed SiC mixed slurry.
The prepared SiC mixed slurry is used for the raw materials of a subsequent fuel-free zone and a fuel zone.
S1, prefabricating a fuel-free area: pressing the SiC mixed powder into a cylinder and a wafer respectively and sintering without pressure.
Step S1 may further include:
and S1.1, drying the SiC mixed slurry prepared in the step S0 to form SiC mixed powder.
S1.2, pressing the SiC mixed powder into a cylinder and a wafer respectively.
Two disks are disposed corresponding to one cylinder.
S1.3, sintering the cylinder and the wafer under a pressureless condition to densify the cylinder and the wafer.
In step S1, the wall thickness of the pressed cylinder may be 3-5mm, and the thickness of the disc may be 2-3 mm.
The density of the cylinder and the disc after pressureless sintering is controlled to be 60-80 percent respectively, so that the density of the cylinder and the disc is close to or the same as that of the fuel area of the pellet, and the density difference between the cylinder and the disc is reduced.
And during pressureless sintering, controlling the sintering temperature according to the required density of the cylinder and the wafer, so that the density of the sintered cylinder and the wafer is in a required range.
During pressureless sintering, SiC powder is covered on the cylinder body and the wafer, and the volatilization of various auxiliary agents in the SiC mixed powder is mainly reduced or prevented.
S2, filling the cylinder with the TRISO particles having the SiC coating layer, and pressing the TRISO particles having the SiC coating layer in the cylinder to form a cylinder.
The pressure for pressing the TRISO particles with the SiC coating into a cylinder is 20-40 MPa. In the cylinder, the SiC coating forms a matrix in which the TRISO particles are dispersed; the content of TRISO particles in the cylinder is 40-60%. The density of the cylinders is 40-50%.
Step S2 may further include:
s2.1, taking the SiC mixed slurry prepared in the step S0, spraying the SiC mixed slurry on the surfaces of the TRISO particles, and drying to form SiC coating layers on the TRISO particles.
And S2.2, filling the TRISO particles with the SiC coating layer into the cylinder, and pressing the TRISO particles in the cylinder to form a cylinder under the pressure of 20-40 MPa.
The cylinder is dimensioned to correspond to the cylinder, e.g. the outer diameter of the cylinder is equal to or slightly smaller than the inner diameter of the cylinder, and the height of the cylinder is equal to the height of the cylinder.
And S3, respectively placing round pieces at two opposite ends of the cylinder body, and sintering by using discharge plasma to obtain the inert matrix dispersion fuel pellet.
The cylinder forms a fuel zone in which the inert matrix disperses the fuel pellets, and the cylinder and the disc form a fuel-free zone in which the inert matrix disperses the fuel pellets.
The diameter of the wafer is equal to the outer diameter of the cylinder, and the wafer covers the cylinder and the cylinder inside the cylinder at the end part of the cylinder. The outer diameter of the cylinder corresponds to the inner diameter of the cylinder so that the cylinder fits snugly within the cylinder.
Spark plasma sintering is performed in a graphite mold. When the discharge plasma is sintered, the sintering temperature is 1600-2000 ℃, the sintering pressure is 10-50MPa, and the heat preservation time is 5-20 min. And after sintering, cooling along with the furnace to obtain the inert matrix dispersion fuel pellet.
The difference between this embodiment and the first embodiment is that the fuel zone material is loaded into the fuel-free zone and then pressed, the three-dimensional perspective view of the resulting pellets is substantially the same as the three-dimensional perspective view of the pellets produced in the first embodiment, and the peripheral contour of the TRISO particles is more regular.
The inert matrix dispersion fuel pellet prepared by the preparation method comprises a fuel area and a fuel-free area, wherein the fuel area is positioned in the fuel-free area.
Specifically, the fuel region is formed by a cylinder, and the fuel-free region is formed by a cylinder and a disc. The cylinder is arranged in the cylinder body, the space inside the cylinder body is filled, the circular sheets are arranged at two opposite ends of the cylinder body, and the integral inert matrix dispersion fuel pellet is formed after sintering.
In conclusion, in the invention, the fuel-free area is sintered and then is molded with the fuel area, and the strength of the sintered fuel-free area is higher than that of an unsintered green body, so that the risk of splitting of the fuel-free area in the molding process can be reduced. The density difference between the fuel area and the non-fuel area in the pellet can be reduced by calculating the density of the pre-prepared non-fuel area before and after sintering; the prefabricated fuel-free area has higher density, plays a role in restraining TRISO particles in the fuel area, can prevent the TRISO particles from moving to the fuel-free area in the sintering process, is beneficial to controlling the size of the fuel area, can enlarge the diameter of the fuel area and improve the volume content of the TRISO particles in the pellet. In addition, the increased density of the fuel-free zones in the pellets improves the mechanical properties of the pellets.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (12)
1. A method of making an inert matrix dispersed fuel pellet comprising the steps of:
s1, prefabricating a fuel-free area: pressing the SiC mixed powder into a cylinder and a wafer respectively and sintering under no pressure; when pressureless sintering is carried out, covering SiC powder on the cylinder body and the wafer; controlling the density of the cylinder and the wafer after pressureless sintering to be 60-80% respectively;
s2, a pre-fuel area: pressing the TRISO particles with the SiC coating layer into a cylinder; the density of the cylinder is 40-50%;
s3, the cylinder is arranged in the cylinder body, the round pieces are respectively arranged at the two opposite ends of the cylinder body, and the inert matrix dispersion fuel pellet is prepared by discharge plasma sintering;
the cylinder forms a fuel zone of the inert matrix-dispersed fuel pellets, and the cylinder and disc form a fuel-free zone of the inert matrix-dispersed fuel pellets.
2. A method of producing inert matrix-dispersed fuel pellets according to claim 1, wherein the wall thickness of the cylinder is 3-5mm and the thickness of the discs is 2-3 mm.
3. A method of producing inert matrix-dispersed fuel pellets according to claim 1, characterized in that the diameter of the disc is equal to the outer diameter of the cylinder; the outer diameter of the cylinder is equal to the inner diameter of the cylinder.
4. The method of claim 1 wherein in step S3, the sintering temperature is 1600-.
5. A method of producing inert matrix-dispersed fuel pellets according to any of claims 1 to 4, characterized in that it further comprises the steps of:
s0, mixing the sintering aid, the SiC powder and the dispersing agent to obtain uniformly dispersed SiC mixed slurry;
step S1 includes:
s1.1, drying the SiC mixed slurry to form SiC mixed powder;
s1.2, pressing the SiC mixed powder into a cylinder and a wafer respectively;
s1.3, sintering the cylinder and the wafer under a pressureless condition.
6. The method for producing inert matrix-dispersed fuel pellets according to claim 5, wherein step S2 includes:
s2.1, taking the SiC mixed slurry and spraying the SiC mixed slurry on the surface of TRISO particles, and drying to form a SiC coating layer on the TRISO particles;
s2.2, pressing the TRISO particles with the SiC coating layer into a cylinder under the pressure of 20-40 MPa.
7. A method of making an inert matrix dispersed fuel pellet comprising the steps of:
s1, prefabricating a fuel-free area: pressing the SiC mixed powder into a cylinder and a wafer respectively and sintering under no pressure; the density of the cylinder and the disc after pressureless sintering is 60-80% respectively; when pressureless sintering is carried out, covering SiC powder on the cylinder body and the wafer;
s2, filling TRISO particles with SiC coating layers into the cylinder body, and pressing the TRISO particles in the cylinder body to form a cylinder; the density of the cylinder is 40-50%;
s3, respectively placing the round pieces at two opposite ends of the cylinder body, and sintering by using discharge plasma to obtain inert matrix dispersion fuel pellets;
the cylinder forms a fuel zone of the inert matrix-dispersed fuel pellets, and the cylinder and disc form a fuel-free zone of the inert matrix-dispersed fuel pellets.
8. A method of producing inert matrix-dispersed fuel pellets according to claim 7, characterized in that the wall thickness of the cylinder is 3-5mm and the thickness of the discs is 2-3 mm.
9. The method of claim 7 wherein in step S3, the sintering temperature is 1600-2000 ℃, the sintering pressure is 10-50MPa, and the holding time is 5-20 min.
10. A method of producing inert matrix-dispersed fuel pellets according to any of claims 7 to 9, characterized in that it further comprises the steps of:
s0, mixing the sintering aid, the SiC powder and the dispersing agent to obtain uniformly dispersed SiC mixed slurry;
step S1 includes:
s1.1, drying the SiC mixed slurry to form SiC mixed powder;
s1.2, pressing the SiC mixed powder into a cylinder and a wafer respectively;
s1.3, sintering the cylinder and the wafer under a pressureless condition.
11. The method for producing inert matrix-dispersed fuel pellets according to claim 10, wherein step S2 includes:
s2.1, taking the SiC mixed slurry and spraying the SiC mixed slurry on the surface of TRISO particles, and drying to form a SiC coating layer on the TRISO particles;
s2.2, filling the TRISO particles with the SiC coating layer into the cylinder, and pressing the TRISO particles in the cylinder to form a cylinder under the pressure of 20-40 MPa.
12. An inert matrix dispersed fuel pellet produced by the production method according to any one of claims 1 to 6 or any one of claims 7 to 11.
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| CN113012832A (en) * | 2019-12-20 | 2021-06-22 | 中核北方核燃料元件有限公司 | UO2Composite UN-UO2Method for producing fuel pellets |
| CN111933310B (en) * | 2020-06-09 | 2022-07-19 | 上海核工程研究设计院有限公司 | High-thermal-conductivity uranium dioxide single crystal composite fuel pellet and preparation method thereof |
| WO2022241733A1 (en) * | 2021-05-20 | 2022-11-24 | 中广核研究院有限公司 | High-entropy ceramic inert matrix dispersion fuel pellet and preparation method therefor |
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| CN106448749A (en) * | 2016-09-23 | 2017-02-22 | 中广核研究院有限公司 | Fuel pellet and preparation method thereof |
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