This animated film describes the Advanced Test Reactor (ATR), a research reactor at the Idaho National Laboratory, located east of Arco, Idaho. This reactor is primarily designed and used to test materials to be used in larger-scale and prototype reactors. It can operate at a maximum power of 250 MW and has a "Four Leaf Clover" design (similar to the Camunian rose) that allows for a variety of testing locations. The unique design allows for different flux in various locations and specialized systems also allow for certain experiments to be run at their own temperature and pressure.
The ATR is ordinary (light) water moderated and cooled, with a beryllium neutron reflector. It is pressurized and housed in a stainless steel tank.
As well as its role in materials irradiation work, ATR is the USA's only source of Cobalt-60 for medical applications.
Since 1951, fifty-two reactors have been built on the grounds of what was originally the Atomic Energy Commission’s National Reactor Testing Station, currently the location of Idaho National Laboratory (INL). Constructed in 1967, the ATR is the second-oldest of three reactors still in operation at the site. Its primary function is to intensely bombard samples of materials and fuels with neutrons to simulate long-term exposure to high levels of radiation, as would be present in a commercial nuclear reactor. The ATR is one of only four test reactors in the world with this capability. The reactor also produces rare isotopes for use in medicine and industry.
The Materials Test Reactor is also described. The Materials Testing Reactor (MTR) was developed in a cooperative effort by Oak Ridge National Laboratory and Argonne National Laboratory. The primary purpose of the MTR reactor was to test under conditions of severe neutron bombardment the materials which might be used in reactor construction (in the structures, cooling systems, or shields).
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