This work is aimed at running the first IRIS reactor core with mixed thorium dioxide fuel（ThO2-UO2 and ThO2-PuO2）.Calculations are performed by using Dragon 4.0.4 and Citation codes.The results show the multiplication factor(Keff) for central and peripheral assemblies as a function of burnup.To ensure the proliferation resistance,the value of 235U enrichment is < 20%.The Keff is calculated using Dragon 4.0.4 for a single fuel rod and the model developed to fuel assembly,while the whole core was calculated using Citation code.For a fuel burnup,the use of increased enrichment fuel in the IRIS core leads to high reserve of reactivity,which is compensated with an integral fuel burnable absorber.The self-shielding of boron is in an IRIS reactor fuel.The effect of increased enrichment to the burn-up rates,and burnable poison distribution on the reactor performance,are evaluated.The equipment used in traditional light water reactors is evaluated for designing a small unit IRIS reactor.
中国和欧盟合作研究项目超临界水堆鉴定实验(Supercritical Water Reactor-Fuel Qualification Test,SCWR-FQT)的主要目的是研究水在超临界条件下对回路结构设计的影响,为研究设计超临界水堆做基础工作。本次研究对象为位于LVR-15实验堆堆芯中的超临界水实验SCWR-FQT装置。热工水力分析和回路设计的前提是堆芯及实验装置的物理分析,包括临界分析和燃耗分析等。RMC是清华大学自主研发的堆用蒙特卡罗分析软件,本文基于此软件对LVR-15堆芯和超临界实验装置进行了物理分析,并完成了全堆临界计算,得到了临界富集度、全堆芯中子通量分布和超临界装置中的中子能谱和通量分布,最后完成了全堆及超临界装置的燃耗计算和分析。
