The central portion of anuclear reactor, which contains thefuel assemblies,moderator,neutron poisons,control rods, and support structures. The reactor core is wherefissiontakes place
U.S. Nuclear Regulatory Commission (NRC), Full-Text Glossary, Washington, DC, USA 2014. http://www.nrc.gov/reading-rm/basic-ref/glossary/f ull-text.html, (Dzstr/ Disabl Mass Care - Amer) {826}