子通道程序SUBSC的开发及稳态验证

Development and Steady Validation of Subchannel Code SUBSC

采用面向对象模块化编程技术开发了面向大规模热工水力计算的自主化子通道程序SUBSC,利用SUBSC和COBRA程序分别计算了典型压水堆1/4组件,结果表明,两者计算结果吻合很好。为进一步验证SUBSC程序,计算了PSBT稳态5×5棒束基准题,结果表明,在各种工况下SUBSC程序计算得到的通道平均含汽率与实验测量值吻合很好,最大相对偏差仅为0.7%,证明了程序具有较高的计算精度。为提高SUBSC程序的计算效率,引入不完全LU分解预处理的再启动GMRES算法求解质量守恒方程,对多组件的计算结果表明,SUBSC程序具备大规模热工水力计算能力。

An in-house subchannel code SUBSC which was intended to be applied for large-scale thermal-hydraulics calculation was developed with object-oriented module coding technology. Both SUBSC and COBRA subchannel codes were used to calculate a typical PWR quarter assembly and the consistent results were obtained. In order to further validate SUBSC code, a steady-state bundle problem of the PSBT benchmark was calculated. The results show that the channel-averaged quality provided by SUBSC agrees well with the measured data at various conditions with the maximum relative deviation of 0.7%, demonstrating the accuracy of SUBSC code. In order to improve efficiency of SUBSC code, a restart GMRES algorithm with an incomplete LU factoriza- tion preconditioning was implemented for solving the mass conservation equation. The calculated results of multi-assembly indicate that SUBSC code is capable of dealing with large-scale thermal-hydraulics calculation.