IMDP pellet additive manufacturing method and IMDP pellet

Abstract

The invention discloses an IMDP pellet additive manufacturing method and an IMDP pellet. The IMDP pellet additive manufacturing method comprises the following steps of: S1, putting a matrix raw material into a three-dimensional printer, S2, enabling a printer head of the three-dimensional printer to output a molten matrix raw material, and printing a matrix unit with one or more grooves distributed according to a set distance on a printing platform, S3, enabling a mechanical arm cooperating with the three-dimensional printer to put TRISO particles into the groove, repeating steps S2-S3 for multiple times, enabling the multiple sequentially-printed matrix units to be connected into a whole, and enabling the multiple sequentially-printed matrix units and TRISO particles on the multiple sequentially-printed matrix units to form a pellet initial body structure, and S4, outputting the molten matrix raw material by the printer head, printing a covering layer at the top of the pellet initialbody structure, covering the TRISO particles exposed at the top of the pellet initial body structure, and connecting the covering layer with the pellet initial body structure to form an integral IMDPpellet. The IMDP pellet is manufactured in a three-dimensional printing mode, reasonable distribution of TRISO particles is achieved, the loading capacity of nuclear substances is improved, and the performance of the pellet is stabilized.

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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