三维离散纵标方法在中国实验快堆堆芯屏蔽计算中的应用

The shielding calculation for China Experiment Fast Reactor core with three-dimensional SN method

离散纵标(又称SN)方法是反应堆屏蔽计算中常用的方法,随着计算能力的发展和离散纵标计算方法的不断完善,使得离散纵标方法在反应堆的屏蔽计算中得到了广泛的应用。本文以中国实验快堆(CEFR)堆芯为研究对象,使用三维离散纵标方法对区域功率份额、组件功率、DPA、寿期内堆芯围板积分快中子注量及寿期内小栅板联箱积分快中子注量进行了计算研究,并与二维离散纵标法和俄罗斯设计报告结果进行对比。研究结果表明:三维离散纵标方法能够减少二维程序几何等效过程中导致的误差,计算结果可靠,可应用于大型快堆堆芯的屏蔽设计中。

Discrete ordinates（SN） method is the most widely used method for reactor shielding calculation,As the fast development of calculation capacity and consummation of three-dimensional（3-D） SN method.it is mature for 3-D SN method to be used for reactor shielding design for nuclear facilities.This work was done specifically for China Experiment Fast Reactor（CEFR） core model.The fuel assembly power fraction,the power of assembly,DPA,the integral fast neutron fluence of boarding and headerthrottle structure in life were calculated by 3-D SN method.These results were compared with two-dimensional（2-D） SN method and Russia design report.The research result show that the 3-D SN method can reduce the discrepancy during the model equivalence、the result is reliable,and can be utilized to shielding design for largescale fast reactors core.