Nuclear Energy

3. a radioactive isotope of hydrogen with a mass approximately three times that of the common protium isotope.
4. any of a class of devices that can initiate and control a self-sustaining series of nuclear fissions. Nuclear reactors are used as research tools, as systems for producing radioactive isotopes, and most prominently as energy sources for nuclear power plants.
5. Radioactive waste which can be handled safely without shielding.
9. a cylindrical reactor vessel which contains the heavy water moderator. It is penetrated from end to end by hundreds of calandria tubes which accommodate the pressure tubes containing the fuel and coolant.
10. demineralized water as a coolant and neutron moderator.
14. a type of nuclear reactor designed and operated in the United Kingdom
15. Measure of thermal energy released by nuclear fuel relative to its mass, typically Gigawatt days per tonne of fuel.

1. a nuclear reactor in which the fuel is uranium oxide clad in zircaloy and the coolant and moderator is water maintained at high pressure so that it does not boil at the operating temperature of the reactor.
2. the energy released during nuclear fission or fusion, especially when used to generate electricity.
6. a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
7. The emission and propagation of energy by means of electromagnetic waves or particles.
8. a chemical element with symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table.
11. atoms as a source of nuclear energy.
12. a stable isotope of hydrogen with a mass approximately twice that of the usual isotope.
13. the chemical element of atomic number 2, an inert gas which is the lightest member of the noble gas series.