Abstract
Manifestations of autocatalysis, caused by neutron-absorbing samples loaded into a cavity in the core, in explosive accidents in BR-1 and BR-K1 reactors were investigated. The investigation was conducted on the basis of calculations using a multigroup neutron-gas-dynamic program for one-dimensional calculations of fission surges in various configurations of the reactors indicated. It was shown that, even though the boron content in the screens is comparatively limited and the natural isotopic composition of boron is used in the BR-K1 screen, in the case of accidents accompanied by a chain reaction of an explosive type strong manifestations of autocatalysis with nine-fold (BR-1) and 520-fold (BR-K1) increase of energy release in accidental surges are possible.
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