燃料球体积填充率对2MW先进高温堆物理特性的影响

在燃料装载量不变情况下,燃料球体积填充率的变化对于先进高温堆的堆芯物理特性有重要影响。我们运用蒙特卡罗程序MCNP5对艇价中子能谱及中子注量率的空间分布进行了研究。计算中,燃料球体积填充率取值范围在最密堆积和最稀堆积之间(0.7405-0.5236)。结果表明,燃料球体积填充率的增加可以提高堆芯的Keff,促使中子能谱更加硬化,使中子注量率峰值所在轴向的位置上升。从而为先进高温堆的设计和计算程序的开发提供理论基础。...

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Published in核技术 Vol. 36; no. 6; pp. 71 - 75
Main Author 李晓恒 陈金根 邹杨 康旭忠 蔡翔舟 郭威 梅龙伟 张鸿飞
Format Journal Article
LanguageChinese
Published 兰州大学核科学与技术学院 兰州730000%中国科学院上海应用物理研究所嘉定园区 上海201800%兰州大学核科学与技术学院 兰州730000 2013
中国科学院上海应用物理研究所嘉定园区 上海201800
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ISSN0253-3219

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Summary:在燃料装载量不变情况下,燃料球体积填充率的变化对于先进高温堆的堆芯物理特性有重要影响。我们运用蒙特卡罗程序MCNP5对艇价中子能谱及中子注量率的空间分布进行了研究。计算中,燃料球体积填充率取值范围在最密堆积和最稀堆积之间(0.7405-0.5236)。结果表明,燃料球体积填充率的增加可以提高堆芯的Keff,促使中子能谱更加硬化,使中子注量率峰值所在轴向的位置上升。从而为先进高温堆的设计和计算程序的开发提供理论基础。
Bibliography:Background: With a constant fuel inventory, the pebble packing rate has an important influence on the physical property of AHTR. Purpose: This paper attempts to study the influence of the pebble packing on a 2 MW AHTR. Methods: We used Monte Carlo Code MCNP 5 to study the related parameters, such as Keff, neutron spectrum and neutron flux distribution. In the analysis, we changed the packing from 0.7405 to 0.5236. Results: Results show that the changes of the pebble packing could increase the Keff of the core, make the neutron spectrum harder, and make the neutron flux peak up in axial position. Conclusions: Results provide rational theory for the design of AHTR and the development of computation code.
31-1342/TL
AHTR, Criticality, Volume packing, Pebble, Neutron spectrum, Neutron flux
LI Xiaoheng CHEN Jingen ZOU Yang KANG Xuzhong CAI Xiangzhou GUO Wei MEI Longwei ZHANG Hongfei 1 (Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Jiading Campus, Shanghai 201800, China) 2(School of Nuclear Scien
ISSN:0253-3219