The distribution of the number of fissions has been studied as the consequence of a postulated criticality accident using a randomized model for the material distribution in fuel debris with the power law spectrum (1/fβ). The f is the frequency domain variable while the β value is the parameter related to randomness varying in a certain range. This study investigated the effect of β on the temperature coefficient of reactivity and number of fissions. The calculation results for the temperature coefficient of reactivity show that the shape of the histogram changes from symmetrical to positive skewness by increasing the β value. Moreover, large values of β increase the uncertainty of the number of fissions. The results of this study are worthwhile to realize the behavior of the temperature coefficient of reactivity and number of fissions in the randomized model of fuel debris using the 1/fβ spectrum model.
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