NUCLEAR REACTORS

**Definition:** This place covers:

All aspects related to nuclear fission reactors and their components, i.e. all aspects related to the reactors per se, in particular all parts strictly related to the primary cooling circuit of the reactor, as well as monitoring or testing of nuclear fission reactor parameters and components, arrangements for handling nuclear fission reactor components or material and apparatuses and processes adapted to manufacture nuclear fission reactors.

**Limiting references (this place does not cover):** - Nuclear fusion reactors -> G21B - Nuclear explosives and their application -> G21J

**Glossary:** - Core: The central region of a reactor containing fuel and moderator elements, where nuclear fission occurs. - Moderator: Material used in a thermal nuclear reactor to reduce the velocity of neutrons produced by nuclear fission in order to facilitate chain reaction. - Shield: Means surrounding a reactor to prevent radiation damage to operators etc.