Uncertainty reduction for the sodium void reactivity by data assimilation technique using sodium shielding experimental data

Maruyama, Shuhei   ; Endo, Tomohiro*; Yamamoto, Akio*

In this study, nuclear data-induced uncertainty reduction of sodium void reactivity was performed by a data assimilation method using a sodium shielding experiment. The analysis reveals that a large reduction is achieved especially for the uncertainty in the sodium void reactivity, which is dominated by the neutron leakage component.