CAJ | 학술논문

采用考虑6组缓发中子的点堆中子动力学模型，开发了核反馈模拟模块，并将之与摇摆条件下单相自然循环热工水力计算模型进行合并，基于Matlab软件编制了相应的计算程序，实现了摇摆条件下单相自然循环核热耦合的模拟计算。计算结果表明：摇摆条件下，与不考虑核反馈相比，考虑核反馈后核热耦合效应使系统流量降低，系统功率产生波动；系统功率的平均值随摇摆频率及振幅的增大而降低，而系统功率的振幅则随摇摆周期及振幅的增大而增大。核热耦合效应使燃料元件温度的波动振幅减小，起到了抑制燃料温度波动的作用。
채용고필6조완발중자적점퇴중자동역학모형，개발료핵반궤모의모괴，병장지여요파조건하단상자연순배열공수력계산모형진행합병，기우Matlab연건편제료상응적계산정서，실현료요파조건하단상자연순배핵열우합적모의계산。계산결과표명：요파조건하，여불고필핵반궤상비，고필핵반궤후핵열우합효응사계통류량강저，계통공솔산생파동；계통공솔적평균치수요파빈솔급진폭적증대이강저，이계통공솔적진폭칙수요파주기급진폭적증대이증대。핵열우합효응사연료원건온도적파동진폭감소，기도료억제연료온도파동적작용。
A nuclear feedback simulation module adopting the point reactor neutron kinetics model with six delayed neutron precursor groups was proposed . A program which combines a nuclear feedback module with the thermal-hydraulic calculation model to simulate the natural circulation under rolling motion in Matlab platform was developed .The results show that the average flow rate and heating power decrease when considering the nuclear thermal coupling effect under rolling motion condition . The average value of the heating power decreases with the increase of the rolling frequency and rolling amplitude . The oscillation amplitude of the heating power increases with rolling period and rolling amplitude .Furthermore ,the nuclear thermal coupling effect decreases the fluctuation amplitude of the fuel temperature ,playing a positive role in suppressing the temperature fluctuations .