A "power reactor core" is a type of nuclear reactor designed to generate electricity. It is a complex system that combines different materials and components to create a controlled nuclear chain reaction that produces heat. Some synonyms for "power reactor core" include nuclear reactor core, nuclear power unit, atomic reactor core, and nuclear energy system. These terms are often used interchangeably to refer to the heart of a nuclear power plant and the technology that helps to generate electricity from nuclear reactions. Other related terms include fission reactor, fusion reactor, and fast breeder reactor, each of which describes different types of nuclear energy systems.