The advanced technologies of safety and cost decrease in the modern reactors projects

Full text: The advanced technologies of safety used for the accident prevention, connected with uncontrollable change of reactivity, core coolant loss and coolant flow loss are considered in the report. For the accident prevention connected with uncontrollable change of reactivity the measures based on the use of internal inherent properties of safety, and on physical principles are applied basically. These measures are: (a) creation of negative values of all components of the reactivity temperature factor (introduction of negative feedbacks); b) exception of the boron availability in core moderator of some reactors at normal operation; c) accommodation of drive mechanisms of control rods inside the reactor vessel; d) use of burnable poisons in the core, which reduce reactivity stock; e) continuous fuel reloading in the core at a working reactor, which allow to have the minimal reactivity stock