B Reactor can take a tour of the reactor by advance reservation. The reactor was designed and built by E. I. du Pont de Nemours and Company based on experimental designs tested by Enrico Fermi at the University of Chicago, and tests from the X-10 Graphite Reactor at Oak Ridge National Laboratory. It was designed to operate at 250 megawatts (thermal). The reactor occupies a footprint of (about and is tall, occupying a volume of . The reactor core itself consisted of a graphite box measuring occupying a volume of and weighing . It was penetrated horizontally through its entire length by
Enrico Fermi Nuclear Generating Station of threats to public health and the environment. The groups have filed 14 contentions with the NRC, claiming that a new plant would pose "radioactive, toxic and thermal impacts on Lake Erie's vulnerable western basin." In May 2015, the Nuclear Regulatory Commission approved a combined construction and operating license for Fermi 3, but DTE Energy stated there were no plans for construction at that time. The Nuclear Regulatory Commission's 2010 estimate of the risk each year of an earthquake intense enough to cause core damage to the reactor at Fermi was 1 in 238,095 making it the 88th least likely