Organic Moderated Reactor Experiment

The Organic Moderated Reactor Experiment (OMRE) was a 16 MWt experimental organic nuclear reactor that operated at the National Reactor Testing Station from 1957 to 1963 to explore the use of hydrocarbons as coolant, moderator, and reflector materials in power reactor conditions. Such organic fluids are non-corrosive, do not become highly activated under irradiation, and can operate at low pressure and moderate temperature.

Source: Wikipedia — Organic Moderated Reactor Experiment (CC BY-SA 4.0)