Study on neutronics design of ordered-pebble-bed fluoride-salt- cooled high-temperature experimental reactor  

作　　者：Rui Yan Shi-He Yu Yang Zou Qun Yang Bo Zhou Pu Yang Hong-Hua Peng Ya-Fen Liu Ye Dai Rui-Ming Ji Xu-Zhong Kang Xing-Wei Chen Ming-Hai Li Xiao-Han Yu 

机构地区：[1]Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China [2]University of Chinese Academy of Sciences, Beijing 100049,China

出　　处：《Nuclear Science and Techniques》2018年第6期36-44,共9页核技术（英文）

基　　金：supported by the Chinese Academy of Sciences TMSR Strategic Pioneer Science and Technology Project(No.XDA02010000);Thorium uranium fuel cycle characteristics and key problem research Project(No.QYZDY-SSW-JSC016)

摘　　要：This paper presents a neutronics design of a 10 MW ordered-pebble-bed fluoride-salt-cooled high-temperature experimental reactor. Through delicate layout, a core with ordered arranged pebble bed can be formed,which can keep core stability and meet the space requirements for thermal hydraulics and neutronics measurements.Overall, objectives of the core include inherent safety and sufficient excess reactivity providing 120 effective full power days for experiments. Considering the requirements above, the reactive control system is designed to consist of 16 control rods distributed in the graphite reflector. Combining the large control rods worth about 18000–20000 pcm, molten salt drain supplementary means(-6980 to -3651 pcm) and negative temperature coefficient(-6.32 to -3.80 pcm/K) feedback of the whole core, the reactor can realize sufficient shutdown margin and safety under steady state. Besides, some main physical properties, such as reactivity control, neutron spectrum and flux, power density distribution, and reactivity coefficient,have been calculated and analyzed in this study. In addition, some special problems in molten salt coolant are also considered, including ~6Li depletion and tritium production.This paper presents a neutronics design of a 10 MW ordered-pebble-bed fluoride-salt-cooled high-tem- perature experimental reactor. Through delicate layout, a core with ordered arranged pebble bed can be formed, which can keep core stability and meet the space require- ments for thermal hydraulics and neutronics measurements. Overall, objectives of the core include inherent safety and sufficient excess reactivity providing 120 effective full power days for experiments. Considering the requirements above, the reactive control system is designed to consist of 16 control rods distributed in the graphite reflector. Com- bining the large control rods worth about 18000-20000 pcm, molten salt drain supplementary means （- 6980 to - 3651 pcm） and negative temperature coef- ficient （- 6.32 to - 3.80 pcm/K） feedback of the whole core, the reactor can realize sufficient shutdown margin and safety under steady state. Besides, some main physical properties, such as reactivity control, neutron spectrum and flux, power density distribution, and reactivity coefficient, have been calculated and analyzed in this study. In addi- tion, some special problems in molten salt coolant axe also considered, including 6Li depletion and tritium production.

关 键 词：中子物理学 反应堆 试验性 高温度 学习 设计 脉冲编码调制 控制系统 

分 类 号：TL37[核科学技术—核技术及应用]