Accelerator-driven subcritical transmutation reactor core adopting dispersion metal fuel

Abstract

The invention relate to an accelerator-driven subcritical transmutation reactor core adopting a dispersion metal fuel. The accelerator-driven subcritical transmutation reactor core sequentially comprises an external neutron source zone, a buffer zone, a fuel zone, an LBE (Lead-Bismuth Eutectic) reflecting layer zone, a stainless steel reflecting layer zone and a shielding layer zone from reactor core center to outside, wherein the fuel zone is divided into 2-4 zones from inside to outside; a plurality of fuel assemblies with the same structure, quantity and size are respectively loaded in each fuel zone; the fuel assemblies are composed of a plurality of triangularly-arranged fuel rods; the fuel rods are made from (TRU-10Zr)-Zr dispersion metal; and the Pu contents in the fuel rods of the fuel zones are sequentially increased from inside to outside. According to the invention, the fuel rods in the fuel zones are made from the (TRU-10Zr)-Zr dispersion metal, so that harder neutron spectrum is provided for the reactor core, the transmutation of minor actinides (MA) is benefited and the annual transmutation rate is up to about 15% and higher than the annual transmutation rate 10% of a Japanese scheme; and the fuel zone of the reactor core is divided, the Pu contents of the zones are at a certain proportion, the power peak density is low and the maximum value is not more than 450W / cm<3> under the condition that the safety is guaranteed.

Description

technical field [0001] The invention relates to an accelerator-driven subcritical transmutation core, in particular to an accelerator-driven subcritical transmutation core using dispersoid metal fuel. Background technique [0002] The minimization of nuclear waste is one of the key issues that must be solved for the sustainable development of nuclear energy. In recent decades, the nuclear energy community has been exploring the final treatment methods of minor actinides (MA) and long-lived fission products (LLFP). After comparative analysis, it was found that the final treatment method of nuclear waste nuclides is separation and transmutation. [0003] Due to its inherent safety and advantages in transmutation of nuclear waste, the accelerator-driven subcritical system (ADS) has been widely recognized in industry and has become one of the most popular new reactors in nuclear waste treatment. At present, the ADS being developed internationally mainly includes the following f...

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Problems solved by technology

[0010] In scheme C, the transmutation rate of MA is high, but it needs to enrich more than 90% 15 N, fuel manufacturing costs are high

[0011] In Scheme D, the fuel for the transmutation of MA is an alloy fuel, which has good compatibility during high-temperature chemical treatment, and can meet the requirements of deep burnup and provide a harder fast neutron energy spectrum. It is beneficial to increase the transmutation rate of MA, but scheme D is a fast thermal coupling system, and the MA transmutation rate in the fast zone is not high

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