Study on improvement of safety for accident conditions in spent fuel pool, 10; Effects on criticality due to the differences of water level between in and out of channel box of BWR fuel

Kobayashi, Kensuke*; Tojo, Masayuki*; Goto, Daisuke*; Nemoto, Yoshiyuki; Kaji, Yoshiyuki

no journal, , 

It is suggested that effective multiplication factor would increase if there is a water level difference between in and out of channel box of BWR fuel. Monte Carlo criticality analysis was conducted in consideration of the water density and the water level in and out of the channel box which were indicated in the evaluation using void fraction correlation obtained in previous works simulating several irradiation conditions of BWR fuels.