基于蒙特卡罗均匀化理论与有限体积方法的溶液系统临界事故分析方法

基于蒙特卡罗均匀化理论与有限体积方法，建立了适用于瞬发临界事故分析的三维扩散时空动力学模型。将三维扩散时空动力学模型与非稳态传热模型、辐照裂解气泡模型耦合，对计算程序GETAC-S进行了升级，使其具备了对溶液系统任意几何与材料条件下的瞬态分析能力。使用国际上已有的瞬态装置TRACY的实验数据对GETAC-S进行了验证，结果符合良好。使用GETAC-S对日本的JCO临界事故进行了事故进程反演，证明GETAC-S具备了对复杂溶液系统下的临界事故后果进行评价与反演的能力，为核临界事故的预防、评估和屏蔽提供了理论支持。

Critical Accident Analysis Method of Solution System Based on Monte Carlo Homogenization Theory and Finite Volume Method

Based on the Monte Carlo homogenization theory and the finite volume method, a three-dimensional diffusion spatiotemporal dynamics model suitable for the analysis of instantaneous critical accidents was established. The three-dimensional diffusion spatiotemporal dynamics model was coupled with the unsteady state heat transfer model and the radiation cracking bubble model, and the calculation program GETAC-S was upgraded, so that GETAC-S had the ability to analyze the transient state of the solution system under any geometric and material conditions. GETAC-S was verified by the experimental data of TRACY, which was an international transient device, and the results are in good agreement. GETAC-S was used to invert the process of JCO criticality accident in Japan, and the results show that the GETAC-S has the ability to evaluate and retrieve the consequences of critical accidents in complex solution system, which provide theoretical support for the prevention, evaluation and shielding of nuclear critical accidents.