An Account of Sub-Critical and Critical Reactivity Measurements on the First B.N.L. Zero Energy Reactor

摘要

Some results of prompt neutron decay constant and source jerk measure¬ments on a 1.8% enriched U02 fuelled, graphite moderated and fully reflected assembly are described. The definition of a reactivity scale relative to source jerk measurements, the non-unique decay constant measured for a small core with a large reflector, and the analysis of decay constant measurements near critical are discussed. The excess reactivity measurement of the unperturbed core using the doubling time technique is described for the critical reactor.