摘要
控制棒价值及其燃耗规律是核反应堆物理设计关注的要点之一。球床式高温气冷堆控制棒位于侧反射层石墨孔道中,吸收体为圆环形的B4C,其燃耗特性具有特殊性。采用MCNP耦合燃耗计算模块的方法,对控制棒吸收体进行精细划分,分析了各子区域硼的详细燃耗特性及控制棒价值的变化规律。计算结果表明,由于强烈的空间自屏效应,虽然吸收体外层硼燃耗很多,但吸收体内层硼燃耗很少,因此,反应堆运行寿期末控制棒价值减少很小。
The worth of control rod and its change along depletion are one of important features for reactor neutronics design. The control rods in pebble bed high-temperature gas-cooled reactor （HTR） were located in the hole of side graphite reflector. Its absorb- er was made up of annular B4 C, which had special depletion rules. The depletion charac- teristics in each absorber sub-zone and the changes of the control rod worth were ana- lyzed, based on both the MCNP coupling another depletion module and the detailed modeling control rod absorber region. According to the analysis, the boron in inner region of absorber is depleted only a little, although most of boron in outer region of absorber is depleted, because of the strong space self-shielding effects in control rod absorber. Therefore, the worth of control rod in the HTR decreases just a little at the end of reactor life time.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2011年第12期1484-1488,共5页
Atomic Energy Science and Technology
基金
国家自然科学基金资助项目(10675071)
关键词
球床式高温气冷堆
控制棒
控制棒价值
自屏效应
pebble bed high-temperature gas-cooled reactor
control rod
worth of con-trol rod
self-shielding effect
