Hu Xiao, Chen Xiao-Xian, Chen Xiao-Liang, Huo Xing-Kai
China Institute of Atomic Energy, CIAE: China Institute of Atomic Energy, Beijing, 102413, China.
China Institute of Atomic Energy, CIAE: China Institute of Atomic Energy, Beijing, 102413, China.
Appl Radiat Isot. 2022 Dec;190:110455. doi: 10.1016/j.apradiso.2022.110455. Epub 2022 Sep 19.
The study of the nuclear reaction rate distribution in the MOX core of China Experimental Fast Reactor is a necessary condition for obtaining the operating license. From the characteristics of core structure, both the principle of experimental and experimental system are studies, emphasized on the scheme design such as the size of foils, the irradiation power and counting rate. Firstly, based on the Monte Carlo Code（MCNP）and NJOY codes, the distribution of reaction rates is obtained. MCNP is a general-purpose Monte Carlo N-Particle code that can be used for neutron, photon, electron, and so on. The NJOY nuclear data processing system is a comprehensive computer code package for producing to cross sections and related nuclear parameters from ENDF/B VIII.0 evaluated nuclear data. Secondly, the activity measurement of foils was obtained by HPGE, then the reaction rate is determined by data processing. It is worth mentioning that the experimental reactivity introduction has a negligible effect on the reactor core by MCNP. Finally, a set of activation experiment scheme that is suitable for CEFR MOX core is formed, which serves as a guide to carry out activation method experiments.
研究中国实验快堆MOX堆芯中的核反应速率分布是获得运行许可证的必要条件。从堆芯结构特点出发，对实验原理和实验系统进行了研究，重点放在箔片尺寸、辐照功率和计数率等方案设计上。首先，基于蒙特卡罗程序（MCNP）和NJOY程序，获得了反应速率分布。MCNP是一个通用的蒙特卡罗N粒子程序，可用于中子、光子、电子等。NJOY核数据处理系统是一个综合的计算机程序包，用于从ENDF/B VIII.0评估核数据生成截面和相关核参数。其次，通过高纯锗探测器（HPGE）获得箔片的活度测量值，然后通过数据处理确定反应速率。值得一提的是，MCNP计算得出实验反应性引入对反应堆堆芯的影响可忽略不计。最后，形成了一套适用于中国实验快堆MOX堆芯的活化实验方案，为开展活化法实验提供了指导。
