Investigation of self-adjustable neutron-nuclear mode of the second kind in the fast reactor

Self-adjustable neutron-nuclear mode of the second kind (SANN2) is being investigated. It is shown that an important increase of reactor period and decrease of control are possible. There are several days for repair in a case of control accident. Reactivity store is close to zero in the reactor because of $\rm U^{238}\to\rm Pu$ transformation, i.e. $\rm U^{238}$ is actually burning.