中文摘要：

压水堆燃料组件输运燃耗耦合计算通常采用的是传统的预估-校正（PC）燃耗方法。然而,该方法本身的假设导致其存在一定的计算误差。为进一步提高燃耗计算的精度,本文针对传统的预估-校正燃耗方法的缺陷研究了改进的预估-校正燃耗方法,改进了对核反应率进行修正的高阶预估-校正燃耗方法,并在Bamboo-Lattice程序中进行了程序实现,对该方法进行了验证分析。结果表明：改进的预估-校正燃耗方法和高阶预估-校正燃耗方法在保证计算效率的前提下提高了燃耗计算的精度。

英文摘要：

The coupling calculation of transport and depletion usually adopts traditional predict-correct（PC）burnup method in PWR fuel assembly.However,the method results in the calculation error because of its assumption.In order to improve the accuracy of burnup calculation,the modified PC burnup method was studied and high-order PC burnup method which corrected the microscopic reactivity was improved.Corresponding code was developed to verify and analyze these burnup methods with some benchmarks.The results indicate that new methods improve the calculation accuracy under the premise of insuring calculation efficiency.