[1M08-13] Criticality Safety 1

[1M09] Exponent dependency of neutron multiplication factor distribution in system randomized with 1/f^β frequency spectrum

*Shouhei Araki¹, Yuichi Yamane¹, Taro Ueki¹, Kotaro Tonoike¹ (1. Japan Atomic Energy Agency)

Keywords:Fuel debris, Effective neutron multiplication factor, Monte Carlo calculation, Randomness, Criticality safety

We investigated the effect of the degree of randomness on the distribution of neutron multiplication factors (k_eff) calculated for fuel debris for the purpose of criticality risk assessment. The calculation results with the model randomized with 1/f^β frequency spectrum showed a positive correlation between the exponent β and variance of the k_eff distribution.