原子能科学技术2018，Vol.52Issue(6)：973-978,6.DOI:10.7538/yzk.2017.youxian.0599
多普勒展宽舍弃修正对氟盐冷却球床高温堆中子学的影响分析
Influence of Doppler Broadening Rejection Correction on Neutronics of PB-FHR
摘要
Abstract
In epithermal energy range,the thermal motion of the target nuclides impacts the elastic scattering.The traditional constant scattering cross section approximation free gas model was adopted in Monte Carlo code to describe the scattering in epithermal energy range.Recent researches show that the bias introduced by ignoring the resonance elastic scattering increases with the temperature.The working temperature of the peb-ble-bed fluoride-salt-cooled high-temperature reactor(PB-FHR)is high,therefore it's necessary to consider the resonance elastic scattering by using the Doppler broadening rejection correction(DBRC)method.In this work,the modified Monte Carlo code MCNP5 was used to analyze the pebble unit cell of PB-FHR.It is found that the DBRC method results in an increase of capture reaction rate of 238U and a decrease of infinite multiplication coefficient(kinf)by 123-1 182 pcm.In addition,the absolute difference of kinfintroduced by the DBRC increases with TRISO packing factor and temperature.关键词
多普勒展宽舍弃修正方法/氟盐冷却球床高温堆/238U俘获率/无限增殖因数Key words
Doppler broadening rejection correction method/pebble-bed fluoride-salt-cooled high-temperature reactor/capture reaction rate of 238U/infinite multiplication coefficient分类
能源科技引用本文复制引用
李志峰,蔡杰进,曾勤..多普勒展宽舍弃修正对氟盐冷却球床高温堆中子学的影响分析[J].原子能科学技术,2018,52(6):973-978,6.基金项目
国家自然科学基金资助项目(11675057,11705195) （11675057,11705195）
湖南省教育厅项目资助(15C1176) （15C1176）
中国博士后基金面上项目资助(2017M622697) （2017M622697）
广东省教育厅青年创新人才类项目资助(2017KQNCX006) （2017KQNCX006）
