CFETR水冷陶瓷包层中子学试验模块初步设计与分析

Preliminary design and neutronics analysis of CFETR WCCB experimental mock-up

针对中国聚变工程实验堆(CFETR)水冷陶瓷增殖剂包层(WCCB)基本方案,进行了中子学试验模块初步设计与分析。试验模块由3个氚增殖区、2个中子倍增区、3个冷却板以及第一壁、钨保护层、背板组成,并在试验模块中放置碳酸锂探测器进行氚测量。通过MCNP输运程序和IAEA发布的聚变评价核数据库FENDEL-2.1对试验模块中子学性能进行评估,获得了试验模块各区域的中子能谱以及氚产生率(TPR)值;各个区域中子径向通量以及由中子能谱所得到的边缘效应,表明内部区域能谱最能代表原包层的中子能谱;加反射层能提高试验模块的TPR值,综合考虑能谱,TPR以及经济等因素,加钢反射层是较好的选择。

Based on the water cooled ceramic breeding blanket（WCCB） basic scheme for CFETR, preliminary design and neutronics analysis for experimental mock-up was performed. The experimental mock-up consists of three tritium breeder zones, two neutron multiplying zones and three cooling plates, first wall, tungsten armor and back plate. In the design, the local tritium production rates（TPR） from ~6Li and ~7Li in breeder zones were measured with Li_2CO_3 pellet. The neutronics analysis of experimental mock-up was evaluated by MCNP code with the IAEA Fusion Evaluated Nuclear Data Library FENDL2.1, the neutron energy spectra and TPR values of each region were obtained. The distribution of neutron flux and the neutron spectra in each region indicated the edge effect of the experimental mock-up is important, and the neutron spectrum in the central region is the most representative of the neutron energy spectrum of the original blanket. The reflector can elevate the TPR value. By considering the energy spectrum, TPR and the economic factors, the reflector with steel is a better candidate.