2024 Annual Meeting

Presentation information

Oral presentation

III. Fission Energy Engineering » 301-1 Reactor Physics, Utilization of Nuclear Data, Criticality Safety

[1L13-17] Uncertainty Analysis Method

Tue. Mar 26, 2024 4:05 PM - 5:25 PM Room L (21Bildg.4F 21-423)

Chair:Tomoaki Watanabe(JAEA)

5:05 PM - 5:20 PM

[1L17] Improvement of high-efficiency random sampling method by using control variates method and sensitivity

(5)Optimization of mockup parameters using singular value decomposition

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

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

In the CV-S method, which combines the controlled-variable method and sensitivity, the selection of mockup parameters for calculation was optimized by re-generating mockup parameters of high importance from the sensitivity library by singular value decomposition. As a result, the uncertainty obtained by the CV-S method after the mid-burnup period was about a quarter of that obtained by the conventional method. For the early burnup period, the influence of fission products and Gd fuel on the computational efficiency was confirmed.