Application of High-order Predict-correct Burnup Method in PWR Assembly Calculation

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.