[2M01-04] Uncertainty Evaluation 1

[2M02] Improvement of high-efficiency random sampling method by using control variates method and sensitivity

(4) Application to uncertainty evaluation of infinite multiplication factor for BWR fuel assemblies

*Daichi Takami¹, Go Chiba¹ (1. Hokkaido Univ.)

Keywords:Uncertainty evaluation, Core burnup calculation, Control variates method, Sensitivity coefficient, CV-S method

Further refinement of the CV-S method, which combines the controlled variates method and sensitivity , is underway. The uncertainty of the infinite multiplication factor in a fuel assembly system was evaluated using the sensitivity of the infinite multiplication factor in a fuel pin-cell system as a mock-up parameter. It was found that the uncertainty of the infinite multiplication factor in the fuel assembly system can be estimated efficiently even if the infinite multiplication factor of the pin-cell system without considering burnup effects is used.