Additive manufacturing method of imdp pellets and imdp pellets

Abstract

The invention discloses an IMDP pellet additive manufacturing method and an IMDP pellet. The IMDP pellet additive manufacturing method includes: S1. Putting a matrix raw material into a three-dimensional printer; S2. A printer head of the three-dimensional printer outputs a molten matrix Raw material, print a base unit with one or more grooves arranged at a set distance on the printing platform; S3, the robotic arm in cooperation with the 3D printer puts the TRISO particles into the grooves; Repeat steps S2-S3 Multiple times, the multiple matrix units printed in sequence are connected as a whole, and form a primary structure of pellets with the TRISO particles on them; S4, the printer head outputs the molten matrix raw materials, and prints out on the top of the primary structure of pellets The covering layer covers the TRISO particles exposed on the top of the primary structure of the pellet, and is connected with the primary structure of the pellet to form an integral IMDP pellet. The present invention manufactures IMDP pellets in a three-dimensional printing manner, realizes the reasonable distribution of TRISO particles, increases the loading capacity of nuclear substances, and stabilizes the performance of pellets.

Description

technical field [0001] The invention relates to the technical field of nuclear fuel, in particular to an IMDP pellet additive manufacturing method and the IMDP pellet. Background technique [0002] The full name of IMDP is Inert Matrix Dispersed Pellet, and the Chinese name is "Inert Matrix Dispersed Pellet". Structurally, the IMDP pellet contains a fuel area and a fuel-free area. The fuel area is formed by TRISO particles dispersed in the matrix material, and the TRISO particles contained in it are used as nuclear fuel, and the fuel-free area is entirely composed of the matrix material. [0003] The main feature of IMDP pellets is high safety, and both TRISO particles and matrix have high safety. TRISO particles are composed of a core and an outer coating, and the core is UO 2 Or other fissile substances, the outer cladding layer has a four-layer structure, which are respectively from the inside to the outside: loose buffer layer, dense barrier layer, structural support s...

AI Technical Summary

Problems solved by technology

[0006] (1) The distance between TRISO particles is random, and the distribution is irregular, resulting in large performance fluctuations between pellets;

[0007] (2) The loading capacity of TRISO particles is limited. There is an extrusion process in the traditional process. The "dressing" layer of TRISO particles cannot be thinned, so the distance between TRISO particles cannot be reduced, and the thickness of the fuel-free area is also due to the process. method limits cannot be reduced;

[0008] (3) The lead angle and dish shape cannot be processed, and the thermal stress deformation of the core block cannot be effectively relieved

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