Page 1 Page 2 Page 3 Page 4 Page 5 Page 6 Page 7 Page 8 Page 9 Page 10 Page 11 Page 12 Page 13 Page 14 Page 15 Page 16 Page 17 Page 18 Page 19 Page 20 Page 21 Page 22 Page 23 Page 24 Page 25 Page 26 Page 27 Page 28 Page 29 Page 30 Page 31 Page 32 Page 33 Page 34 Page 35 Page 36 Page 37 Page 38 Page 39 Page 40 Page 41 Page 42 Page 43 Page 44 Page 45 Page 46 Page 47 Page 48 Page 49 Page 50 Page 51 Page 52 Page 53 Page 54 Page 55 Page 56 Page 57 Page 58 Page 59 Page 60 Page 61 Page 62 Page 63 Page 64 Page 65 Page 66 Page 67 Page 68 Page 69 Page 70 Page 71 Page 72 Page 73 Page 74 Page 75 Page 76 Page 77 Page 78 Page 79 Page 80 Page 81 Page 82 Page 83 Page 84 Page 85 Page 86 Page 87 Page 88 Page 89 Page 90 Page 91 Page 92 Page 93 Page 94 Page 95 Page 96 Page 97 Page 98 Page 99 Page 100 Page 101 Page 102 Page 103 Page 104 Page 105 Page 106 Page 107 Page 108 Page 109 Page 110 Page 111 Page 112 Page 113 Page 114 Page 115 Page 116 Page 117 Page 118 Page 119 Page 120 Page 121 Page 122 Page 123 Page 124Nuclear Science User Facilities 28 inside the reactor core reflector tank, 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 1 x 1015 n/cm2 -sec and fast flux is 5 x 1014 n/cm -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 irradiation 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 NSUF offers access to a number of reactors.The AdvancedTest Reactor (ATR) is located at the ATR Complex on the INL Site and has been operating continuously since 1967. In recent years, the reactor has been used for a wide variety of govern- ment and privately sponsored research. The AdvancedTest Reactor Critical Facility (ATRC) reactor is a 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 Laboratory’s (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- tor’s 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 ATR's serpentine design allows a variety of experiment configurations.