The VVER-440 is a type of pressurized water reactor (PWR) designed in the former Soviet Union. It has a thermal power output of 440 megawatts and is primarily used for electricity generation. The reactor uses water as both a coolant and a neutron moderator, ensuring efficient nuclear fission processes. This reactor design features a robust containment structure and employs a dual-loop system for heat exchange. The VVER-440 has been widely used in several countries, contributing to energy production while adhering to safety standards established for nuclear power plants.