增殖比可调快堆堆芯方案设计

Core Design of Fast Reactor With Flexible Breeding Ratio

增殖比可调快堆是指在不对堆芯设计进行重大改动的条件下实现增殖比可调的快中子反应堆。这一思想使快堆设计可先于工业发展需求，实现对核能形势的动态响应。为实现更大的增殖比，选择了增殖性能更为优异的金属燃料，堆芯采取非均匀布置，轴向和径向布置有使用压水堆乏燃料的增殖区。利用SRAC／COREBN软件包和自行编写的换料耦合脚本为工具，提出了具有不同增殖比的钠冷快堆堆芯方案设计。在同一个堆中，使用相同的燃料，仅通过改变组件数量及堆芯布置，便可实现增殖比在1．0～1．4范围内的可调。计算结果表明，各增殖比方案下的空泡反应性和最大线功率等参数均满足快堆设计要求。

Fast reactor with flexible breeding ratio can achieve variable breeding ratios without significant changes of core design. This concept enables fast reactor to effectively respond to the industrial needs. In order to obtain larger breeding ratio, the metal fuel with better performance was selected. Assemblies were heterogeneously arranged. Blankets of PWR spent nuclear fuels were axially and radially arranged. Various sodium cooled fast reactor core schemes with different breeding ratios were proposed. SRAC/COREBN package was used for neutronic calculation and perl scripts was used for shuffling and data exchange. Different breeding ratios were achieved by changing the number of assemblies and their loading pattern. The achieved breeding ratios varied from 1.0 to 1.4. Numerical results show that concerning parameters, such as void worth and maximum linear power, of all schemes satisfy the criteria of fast reactor designs.