不同固体慢化剂对“花”型快谱超临界水冷堆中子学性能的影响分析

Study on Neutronics Performance of Flower Shape Advanced Supercritical Water Cooled Fast Reactor with Different Solid Moderators

不同于一般采用氢化锆作固体慢化剂的反应堆,快谱超临界水冷堆工作在严酷的高温高压条件下,高氢平衡压以及停开堆造成的热冲击都会导致氢化锆中氢的大量损失,事故工况下甚至会引发氢的无控释放。本文通过分析对比多种材料的有效增殖系数、转换比、慢化剂温度反应性、燃料Doppler反应性、空泡反应性等参数的变化,发现氧化铍、碳化硅是中子学综合性能相对较好的"花"型快谱超临界水冷堆固体慢化剂材料,并且对燃料Doppler反应性系数影响不大。

The supercritical water cooled fast reactors worked at such harsh condition with high temperature and high pressure, huge hydrogen balance pressure and thermal shock can result in a great loss of hydrogen. The released hydrogen would be out of control under accident situations. Kerr, conversation ratio, moderator temperature effect, Doppler effect and void effect of different material such as ZrH1.7, Be, BeO, C and SiC are discussed. BeO and SiC hold better integrated performance among these materials. Besides, moderators have less effect on the Doppler effect of fuel.