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Nuclear Science User Facilities 32 each of which can contain multiple experiments. Experiment positions vary in size from 0.5 to 5 inches in diameter 1.27 to 12.7 centimeters and all are 48 inches 121.92 centi- meters long.The peak thermal flux is 1x1015 ncm2 -sec and fast flux is 5x1014 ncm -sec when operating at full power of 250 MW. There is a hydraulic shuttle irradiation system which allows experiments to be inserted and removed during reactor operation and pressurized water reactor PWR loops which enable tests to be performed at prototypical PWR operating conditions. Idaho National Laboratory Advanced Test Reactor Critical Facility ATRC is a low-power version same size and geometry of the higher- powered ATR core. It is operated at power levels less than 5 KW with typical operating power levels of 600 W or less.ATRC is primarily used to provide data for the design and safe operation of experiments for ATR.ATRC is also used to supply core performance data for the restart of ATR after periodic core internals replacement. Occasionally ATRC is used to perform low-power irradia- tion of experiments. REACTOR Capabilities OS-1 OS-3 OS-8 OS-13 OS-18 OS-4 OS-9 OS-14 OS-19 OS-5 OS-10 OS-15 OS-20 OS-6 OS-11 OS-18 OS-21 OS-7 OS-12 OS-17 OS-22 OS-2 ON-8 ON-3 ON-9 ON-4 ON-10 ON-5 ON-11 ON-6 ON-12 ON-7 ON-1 ON-2 13-GA50331 ATR NSUF offers access to a number of reactors.ATR is located at the ATR Complex ATR on the INL Site and has been operating continuously since 1967. In recent years the reactor has been used for a wide variety of government and privately sponsored research.The ATRC reactor is low-power version of ATR. The MIT reactor is a 5-MW reactor with positions for in-core fuels and materials experiments. Oak Ridge National Laboratorys ORNL HFIR is an 85-MW reactor offering steady-state neutron flux and a variety of experiment positions.The PULSTAR reactor at North Carolina State University is a pool-type reactor that offers response charac- teristics similar to commercial light water power reactors. Idaho National Laboratory Advanced Test Reactor ATR is a water-cooled high-flux test reactor with a unique serpentine design that allows large power varia- tions among its flux traps.The reac- tors curved fuel arrangement places fuel closer on all sides of the flux trap positions than is possible in a rect- angular grid.The reactor has nine of these high-intensity neutron flux traps and 68 additional irradiation positions inside the reactor core reflector tank ATRs serpentine design allows a variety of experiment configurations.