摘要
熔盐冷却球床堆采用球形燃料元件,冷却剂采用高温熔盐,其堆内热源分布与压水堆有着明显的区别,而与同样使用球形燃料元件的高温气冷堆相比,燃料球产生的中子和γ会在冷却剂中沉积更多的能量,因此准确计算堆内释热率分布对于这种新型反应堆的热工水力设计、瞬态分析、结构力学设计等都有重要意义。本文使用蒙特卡罗计算程序MCNP对中国科学院设计的10 MW固态燃料钍基熔盐实验堆(TMSR-SF1)堆内的释热率分布进行了详细计算研究,通过使用光子产生偏倚卡(pikmt),经过3次MCNP输运计算得到了TMSR-SF1寿期初(BOL)及寿期末(EOL)堆内各部件的总释热率、体积释热率分布和最大体积释热率。计算结果显示,燃料球释热率占堆内总释热率的94%以上,熔盐和反射层释热率占总释热率的1%以上,其他堆内部件释热率的比例都小于1%。寿期末燃料球、控制棒与石墨球的释热率均有所减少,而反射层等其他构件的释热率有所增加。
The pebble bed fluoride salt cooled reactor uses spherical pebbles as fuel and high-temperature molten salt as coolant.The heat source distribution in the reactor is significantly different from that of the pressurized water reactors.Compared with the high-temperature gas-cooled reactor which also uses the pebble fuel,the heat rate of coolant is higher,since the neutron and gamma deposit more energy in the molten salt than in the gas.Therefore,accurate calculation of the heat rate distribution in the reactor is of great significance for the thermal-hydraulic design,transient analysis and structural mechanics design of this new reactor.In this paper,the Monte Carlo calculation code MCNP was used to calculate the heat rate distribution in the 10 MW Solid-fuel Thorium Molten Salt Reactor(TMSR-SF1)designed by the Chinese Academy of Sciences.By using photon-production bias card(pikmt),after three MCNP transport calculations,the total heat rate,volumetric heat rate distribution and maximum volume heat rate for various regions of TMSR-SF1 at beginning-of-life(BOL)and end-of-life(EOL)reactor were obtained.The results show that the heat rate of the fuel pebbles accounts for more than 94%of the total heat rate in the reactor,while the heat rate of the molten salt and reflector accounts for more than 1%of the total heat rate,and the proportion of heat rate of other components in the reactor is less than 1%.At EOL,the heat rate of the fuel pebbles,the control rod and the graphite pebbles decreases,while that of other components such as the reflector increases.
作者
杨璞
严睿
邹杨
于世和
朱贵凤
周波
马玉雯
YANG Pu;YAN Rui;ZOU Yang;YU Shihe;ZHU Guifeng;ZHOU Bo;MA Yuwen(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2020年第3期450-457,共8页
Atomic Energy Science and Technology
基金
中国科学院战略性先导科技专项资助项目(XDA02010200)
