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Introduction to criticality accident evaluation

Yamane, Yuichi  

The aim of the chapter is to introduce a concept of new method developed to evaluate the number of fission in a criticality accident, which is expected to give reasonable value, not too much overestimated, i.e. the estimated value is in the almost same order as the actual value. The 1st section introduces the phenomena of the criticality accident with uranyl nitrate solution based on the TRACY experiment, which has been conducted by Japan Atomic Energy Agency. In the 2nd section, the condition characterizing a criticality accident is considered, such as temperature, reactivity temperature coefficient, water, cooling, etc. In the 3rd section, a new simplified method to evaluate the total fission number is described. In the 4th section, the new developing method is applied to some case to see its applicability.

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