CAJ | 학술논문

熔盐堆堆芯物理分析不同于传统的固体燃料反应堆，由于燃料流动的特点，堆芯中缓发中子先驱核浓度不仅与中子通量分布相关，还受到燃料盐流动的影响。针对熔盐堆堆芯中多物理场非线性耦合的特性，采用点堆模型方程与二维对流扩散方程、热流体动力学方程相结合建立耦合模型，求解二维稳态条件下熔盐堆堆芯主要物理参数分布，并在稳态条件基础上研究堆芯模型引入3种阶跃扰动后堆芯燃料盐温度在温度负反馈作用下的动态变化过程。结果表明，堆芯在温度负反馈作用下能够快速达到稳定，模型将燃料盐流动特性和缓发中子先驱核浓度空间效应考虑在内，更加接近熔盐堆堆芯真实情况。
용염퇴퇴심물리분석불동우전통적고체연료반응퇴，유우연료류동적특점，퇴심중완발중자선구핵농도불부여중자통량분포상관，환수도연료염류동적영향。침대용염퇴퇴심중다물리장비선성우합적특성，채용점퇴모형방정여이유대류확산방정、열류체동역학방정상결합건립우합모형，구해이유은태조건하용염퇴퇴심주요물리삼수분포，병재은태조건기출상연구퇴심모형인입3충계약우동후퇴심연료염온도재온도부반궤작용하적동태변화과정。결과표명，퇴심재온도부반궤작용하능구쾌속체도은정，모형장연료염류동특성화완발중자선구핵농도공간효응고필재내，경가접근용염퇴퇴심진실정황。
Considering the fuel salt flow effect of the molten salt reactor, the delayed neutron precursors are drifted out of the core, which lead to a complex and highly coupled phyxical environment. A model of point-reactor neutron kinetics equation in combination with 2 - D kinetics equations is presented for de- scribing the stability in the molten salt reactor. In the steady-state operation conditions, dynamic response process of core temperature under the fuel negative feedback effect was simulated after introducing three step representation disturbances. The simulation results indicate that the core could quickly achieve stabil- ity under the negative feedback effect of temperature. Moreover, the flow characteristics of the fuel salt and the space effect of delayed neutron precursors were taken into consideration in this model, which was eln~r~r tn th~ ro~lit~ nf th~ mnh~. ~alt ~aoo~