The Proceedings of the International Conference on Nuclear Engineering (ICONE)
Online ISSN : 2424-2934
2023.30
Session ID : 1631
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ANALYSIS OF PHYSICAL PROPERTIES OF FUEL ELEMENTS BASED ON PLATE-TYPE FUEL DISPERSED PARTICLES
Jiannan LiLing ChenSong LiYongfa ZhangJianli HaoPengfei Liu
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Abstract

Dispersed pellet fuels and plate fuel elements in new pressurized water reactors have good prospects for application. Dispersed fuel has the advantages of extremely infusible character, strong fission product retention, high oxidation resistance, and mainly exists in the form of pellets. Meanwhile, reactivity is a crucial issue during the operation of the reactor, which needs to be well controlled throughout its life cycle, and the implementation of burnable poison is one of the most effective measures. Therefore, in this paper, based on the Monte Carlo method program OpenMC, a two-dimensional plate fuel grid element is constructed with a single plate in the MTR assembly as the study object , and the dispersed particles are set up and then the volume is homogenized. As a comparison, both two methods have the same material with the same mass, and the conventional volume homogenization method will overestimate the neutron absorption effect, which will lead to a large deviation in the reactivity calculation. At the same time for different setting conditions deviation is different, with the increase of enrichment, particle size increases, packing factor decreases its deviation will gradually increase; the increase of the temperature of the moderator affects the temperature coefficient of the moderator and thus makes the reactivity deviation change but the trend is not obvious, at the same time the dispersed particles with poison will also cause deviation, and different poison affects differently.

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© 2023 The Japan Society of Mechanical Engineers
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