b'What is a test reactor?U nlike a commercial reactor designed to generate heat and produce power, test reactors are used strictly for research. They are designed to accelerate fuel and material performance testing, and operate at much lower temperatures and pressures than most large-scale commercial reactors. Researchers use the reactors to perform experiments that advance nuclear energy and nuclear propulsion, and to help better understand nuclear physics. Two of INLsfour operating research reactors fall inthis category.'