加速器驱动次临界快堆初装堆芯的功率密度分布展平

为了降低以(U、Pu、Np、Am、Cm)O2为燃料的加速器驱动次临界快堆(ADSFR)堆芯径的功率峰因子,将堆芯精细地分为燃料高、低富集度区.采用耦合散裂中子源的产生(LAHET)、中子输运(MCNP)和核素燃耗(ORIGEN2)等计算程序的COUPLE程序系统进行计算分析.结果显示,在设定的0.97初始临界度下,富集度分割比为1.5时将给出最有利的结果:初始的全堆功率峰因子为1.692;以840 MW的热功率运行过程中,尽管全堆的功率峰因子不断升高,但至300 d时,只达到1.963.堆芯物理设计满足预期要求.

Power density profile flattening for the initial core of an accelerator-driven subcritical fast reactor

Refined allocations of the assemblies to high- and low- enrichment zones were used to reduce the power peaking factors of the Accelerator-Driven Sub-critical Fast Reactor (ADSFR) loaded with (U, Pu, Np, Am, Cm)O_2 fuel elements. The calculations were done using the code system COUPLE, which consists of three programs: LAHET for the simulation of the neutron source, MCNP for the neutron transport, and ORIGEN2 for the burnup. The results show that an enrichment split of 1.5 gives the best performance at a initial criticality of 0.97 for the initial core with a whole-core peak power density factor of 1.692 during operation with a thermal power level of 840 MW. The peak power density factor increases gradually to 1.963 after 300 days. The reactor core physical design satifies expected requirements.