Subcritical limits for plutonium systems

As a contribution to a required review of American National Standard for Nuclear Criticality Safety in Operations with Fissionable Materials Outside Reactors, limits for plutonium systems have been recalculated to confirm their subcriticality under the stated conditions or to propose other values. This paper presents calculation methods and results. The validity of each calculation method was established by extensive correlation with critical experiments, and in some cases with experiments performed subsequent to the original limit calculations. 48 refs