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There are 9 miniature neutron source reactors (MNSRs) built in countries around the world, all of which use U-Al alloy fuel elements with 235U enrichment of about 90%. From 2016 to 2018, consider the non-proliferation of nuclear, based on the RERTR project, the low enrichment conversion of three MNSRs was completed, the prototype MNSR-IAE in China, the commercial MNSR GHARR-1 in Ghana and the MNSR NIRR-1 in Nigeria. Considering the economy of reactor and the requirement of faster operation, the MNSRIAE adopts UO2 pellets with 235U enrichment of 12.5% as the fuel element without changing the core size and structure, and the GARR-1 and NIRR-1 both use UO2 pellets with 235U enrichment of 13% as the fuel element. The existing core arrangement is suitable for high enriched uranium (HEU) core, and the core arrangement with low enriched uranium (LEU) as fuel element has a large space for optimization. On the premise that the core diameter and active zone remain unchanged, the changes of thermal neutron flux density in the core and in the Be reflector at similar 235U loading levels are studied by calculating different core arrangement. The performance of the reactor can be improved by optimizing the core arrangement.

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Study on Optimization of Low Enriched Uranium Core Arrangement of MNSR

  • 会议论文

  • 发表日期：

    2026年

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  • MengJiao Wang,
  • Qian Hao,
  • XiaoBo Wu,
  • JingYan Hong,
  • JinHua Zhang,
  • Dan Pen,
  • YiGuo Li

摘要

There are 9 miniature neutron source reactors (MNSRs) built in countries around the world, all of which use U-Al alloy fuel elements with 235U enrichment of about 90%. From 2016 to 2018, consider the non-proliferation of nuclear, based on the RERTR project, the low enrichment conversion of three MNSRs was completed, the prototype MNSR-IAE in China, the commercial MNSR GHARR-1 in Ghana and the MNSR NIRR-1 in Nigeria. Considering the economy of reactor and the requirement of faster operation, the MNSRIAE adopts UO2 pellets with 235U enrichment of 12.5% as the fuel element without changing the core size and structure, and the GARR-1 and NIRR-1 both use UO2 pellets with 235U enrichment of 13% as the fuel element. The existing core arrangement is suitable for high enriched uranium (HEU) core, and the core arrangement with low enriched uranium (LEU) as fuel element has a large space for optimization. On the premise that the core diameter and active zone remain unchanged, the changes of thermal neutron flux density in the core and in the Be reflector at similar 235U loading levels are studied by calculating different core arrangement. The performance of the reactor can be improved by optimizing the core arrangement.