Currently, the ATR NSUF offers two reactor facilities to users--the advanced test reactor (ATR) and the MIT reactor.  The ATR is located on the INL site in Idaho.  It is a water cooled, high flux test reactor, with a unique, serpentine design which provides large power variations among its flux traps.  The beryllium control cylinders contain hafnium plates that can be rotated toward and away from the core, and hafnium shim rods which withdraw vertically, can be individually inserted or withdrawn for minor power adjustments.  The ATR User's Guide contains detailed information on the operating conditions of the reactor, positions, flux and fluence available.

The MIT reactor is a 5 MW research tank-type reactor.  It is equipped with a wide variety of sample irradiation positions with fast and thermal neutron fluxes up to 1014 and 5x1013 /cm2 s.  A variety of in-core and support instrumentation and measurement can be provided to support in-core opp irradiation.  The MITR User's Guide contains detailed information on the operating conditions of the reactor, positions, flux and fluence available.