Abstract The transient capability of a SP3 based pin-wise core analysis code SPHINCS is developed and verified through the analyses of the C5G7-TD benchmark. Spatial discretization is done by the fine mesh finite difference method (FDM) within the framework of the coarse mesh finite difference (CMFD) formulation. Pin size fine meshes are used in the radial fine mesh kernels. The time derivatives of the odd moments in the time-dependent SP3 equations are neglected. The pin homogenized group constants and Super Homogenization (SPH) factors generated from the 2D single assembly calculations at the unrodded and rodded conditions are used in the transient calculations via proper interpolation involving the approximate flux weighting method for the cases that involve control rod movement. The simplifications and approximations introduced in SPHINCS are assessed and verified by solving all the problems of C5G7-TD and then by comparing with the results of the direct whole core calculation code nTRACER. It is demonstrated that SPHINCS yields accurate solutions in the transient behaviors of core power and reactivity.

中文翻译：

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使用多组引脚同质化 SP3 代码 SPHINCS 分析 C5G7-TD 基准测试

摘要 通过对 C5G7-TD 基准的分析，开发并验证了基于 SP3 的引脚核心分析代码 SPHINCS 的瞬态能力。空间离散化是在粗网格有限差分 (CMFD) 公式的框架内通过细网格有限差分方法 (FDM) 完成的。在径向细网格内核中使用针尺寸细网格。时间相关的 SP3 方程中奇矩的时间导数被忽略。在无杆和有杆条件下从 2D 单个组件计算生成的销均质化群常数和超级均质化 (SPH) 因子用于瞬态计算中，通过适当的插值，涉及控制杆运动的情况下的近似通量加权方法。通过解决 C5G7-TD 的所有问题，然后与直接整个核心计算代码 nTRACER 的结果进行比较，对 SPHINCS 中引入的简化和近似进行了评估和验证。证明 SPHINCS 在核心功率和反应性的瞬态行为中产生准确的解决方案。