Abstract The sensitivity of FCM parameters to the equivalent radius of the RPT model is evaluated by a quantitative method, and six important FCM parameters are identified. Then the relationship between the six parameters and the equivalent radius of the RPT model is analyzed. Finally, a rapid fitting RPT method is proposed. The new method can directly establish the RPT model by a fitting formula without relying on the results of the Monte Carlo high-fidelity model. The numerical results show that the fitting RPT method achieves high precision in most test cases, which demonstrates practicability for the lattice physics calculation of FCM fuel using conventional PWR lattice physics codes.

中文翻译：

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轻水堆FCM燃料的RPT方法综合评价

摘要 通过定量方法评估了FCM参数对RPT模型等效半径的敏感性，确定了六个重要的FCM参数。然后分析了六个参数与RPT模型等效半径的关系。最后，提出了一种快速拟合的RPT方法。新方法可以通过拟合公式直接建立RPT模型，不依赖于蒙特卡罗高保真模型的结果。数值结果表明，拟合RPT方法在大多数测试案例中都达到了较高的精度，证明了使用常规压水堆晶格物理程序进行FCM燃料晶格物理计算的实用性。