The Fission Process
The MITR-II is a tank-type reactor, having in fact two tanks: an inner one for
the light water coolant moderator and an outer one for the heavy water reflector. The fuel elements of uranium are positioned in
a hexagonal core structure, 38 cm (15 inches) across, at the bottom of the core tank. Power is controlled by six shim blades and an
automatic regulating rod. The pressure in the system is practically atmospheric, and the maximum temperature approximately 50 C (120
F). An exterior shield of dense concrete makes it possible for research workers and students to conduct experiments and training without
The MIT nuclear reactor contains a number of experimental
facilities. There are more than 40 ports (horizontal and vertical) which penetrate the concrete shield and graphite reflector.
Below the reactor is a shielded medical room for the use of a neutron beam in Boron Neutron Capture Therapy. A number of experimental
facilities are installed in the graphite reflector, including pneumatic facilities for neutron activation analysis, and through ports for
Neutron Transmutation Doping of Silicon.