Accidents preventing possibility in reactor core

The method of fast insertion of absorbers into a reactor core is most acceptable to prevent reactor accident connected with its acceleration. At present the problem is solved in each reactor by its own way. In this work has been suggested some measures and methods of fast insertion of ab sorbents for preventing accident process in reactor core. The physical and technical devices immediate reacting to temperature and pressure increase are observed in the work. The several variants of anti-accidental devices are considered