A new multiphysics simulation suite has been created to model Liquid Metal-cooled Fast Reactors (LMFRs). LUPINE: “LMFR Utility for Physics Informed Nuclear Engineering” is based on the Finite Element Method (FEM) and employs a general, unstructured mesh to solve the Simplified ${\mathrm{P}}_N$ (${\mathrm{SP}}_N$) neutron transport equations and multiphysics models to simulate thermal hydraulics and thermal expansion. Results of validation benchmarks are presented using the ${\mathrm{SP}}_N$ solver and runtime results indicate that the ${\mathrm{SP}}_N$ solver scales well for increasing ${\mathrm{SP}}_N$ truncation order. To demonstrate the multiphysics coupling capabilities of LUPINE, the Advanced Burner Reactor (ABR) MET-1000 benchmark is modeled using coupled neutronics, thermal hydraulics, and thermal expansion models. It is shown that the SP₃ method is sufficient to model the ${\mathrm{SP}}_N$ effects in the ABR. The multiphysics models are showcased by calculating several multiphysics reactivity coefficients including: power defect, thermal expansion coefficient, Doppler coefficient, and Coolant Temperature Coefficient (CTC).

已经创建了一个新的多物理场仿真套件，以对液态金属冷却快堆（LMFR）进行建模。羽扇：“LMFR实用的物理知情核工程”是基于有限元法（FEM）和采用通用的，非结构化的网格解决简体${\mathrm{P}}_{ñ}$ （${\mathrm{SP}}_{ñ}$）中子输运方程和多物理场模型来模拟热力学和热膨胀。验证基准的结果使用${\mathrm{SP}}_{ñ}$ 求解器和运行时结果表明 ${\mathrm{SP}}_{ñ}$ 求解器可以很好地扩展以增加 ${\mathrm{SP}}_{ñ}$截断顺序。为了证明多物理场耦合的能力羽扇，高级燃烧器反应器（ABR）MET-1000基准，使用耦合中子，热工水力，和热膨胀模型建模。结果表明，SP ₃方法足以对模型进行建模。${\mathrm{SP}}_{ñ}$ABR中的效果。通过计算几个多物理场反应性系数来展示多物理场模型，其中包括：功率缺陷，热膨胀系数，多普勒系数和冷却液温度系数（CTC）。