In this paper,by means of Sn method we have calculated the humeri-eal value of nuclear critical conditions of bare sphere and complex spheremade of U~(235) or Pu~(239).

• 本文应用 S_n 方法；对 U~(235)或 Pu~(239)制作的裸球和复合球的核临界情况进行了数值计算.