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耦合三维中子时空动力学程序和超临界水堆(SCWR)热工水力计算程序,开发了适用于SCWR堆芯瞬态和事故分析的三维瞬态分析程序STTA。采用第二类边界条件节块格林函数方法 NGFMN_K求解瞬态中子扩散方程,采用串行耦合方法将SCWR子通道程序ATHAS嵌入NGFMN_K程序。通过压水堆基准题NEACRP-L-335和SCWR弹棒问题检验STTA程序,结果表明:STTA针对压水堆问题的计算结果与参考解符合良好,针对SCWR问题的计算结果合理可信,可用于SCWR堆芯的三维瞬态性能分析。
Coupled with the three-dimensional neutron space-time dynamics program and the thermal-hydraulic computing program of supercritical water reactor (SCWR), a three-dimensional transient analysis program STTA for core-transient and accident analysis of SCWR was developed. A second type of boundary condition nodal Green’s function method NGFMN_K is used to solve the transient neutron diffusion equation. The SCWR subchannel program ATHAS is embedded into the NGFMN_K program using a serial coupling method. The STTA program was verified by PWR benchmark questions NEACRP-L-335 and SCWR. The results show that STTA’s calculation results for PWR are in good agreement with the reference solution, and the calculation results for the SCWR problem are reasonable and credible. Three Dimensional Transient Performance Analysis of SCWR Core.