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The behaviour of neutron and delayed neutron precursors in subcritical systems is considered in time-dependent physical models at different levels of detail. Point kinetics and a simple space model in one-group diffusion theory are assumed at first, in order to be able to construct analytical solutions and to gain a full insight into the problem. More realistic calculations are then performed using a numerical multigroup diffusion code in two-dimensional cylindrical geometry. The results presented clearly show the appearance of a decoupling phenomenon between the evolutions of neutrons and delayed neutron precursors, which is enhanced by the subcriticality level of the multiplying system.

Decoupling of neutron and delayed neutron precursor evolutions in source-driven subcritical systems