A STUDY OF SOME CANADIAN EXPERIMENTS USING THE WINFRITH FIVE-GROUP SCHEME

摘要

As part of the justification of the Winfrith five-group scheme a series of Canadian critical experiments have been analysed. These include 19 and 7-rod clusters, the latter with air and organic coolant as well as heavy water. Agreement of calculation with experiment on fast fission and conversion ratio is very good. Discrepancies of up to 2$ in reactivity are traced to errors in fine structure which are due partly to the use of diffusion theory and partly to the method used to simulate end-regions. When fine structure is corrected the deviation of calculated k effective from unity is less than 1/2 ％ in practical cases.