Abstract
The stability of the neutron field in a conversion load of commercial uranium-graphite reactors on the basis of highly enriched uranium in connection with the intrinsic positive reactivity effect with respect to fuel temperature is studied. This effect is small compared with the negative reactivity effect with respect to the coolant temperature, but nonetheless this feature creates the prerequisites for the appearance of neutron-physical instability during reactor operation and requires a corresponding study. The analysis was based on the computational investigation of the behavior of simplified one-point and one-dimensional models of the core in transient regimes with a mutually consistent description of the dynamics of the neutron- and thermophysical properties of the load. The basic assumptions concerning the characteristics of the reactor which were used in the computational model are presented. The results obtained, on the basis of the approximations adopted, preclude the possibility of the appearance of spontaneous high-frequency oscillations, due to positive effect of reactivity with respect to fuel temperature, in the conversion load.
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