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 1242015 | ANNUAL REPORT 29 Top of the HFIR reactor. Aerial view of the ATRC reactor core and bridge. Oak Ridge National Laboratory High Flux Isotope Reactor High Flux Isotope Reactor (HFIR) is a versatile 85-MW research reactor offering the highest steady-state neutron flux in the western world. With a peak thermal flux of 2.5 x 1015 n/cm2 -s and a peak fast flux of 1.1 x 1015 n/cm2 -s, HFIR is able to quickly generate isotopes that require multiple neutron captures and perform materials irradiations that simulate lifetimes of power reactor use in a fraction of the time. HFIR typically operates seven cycles per year, each cycle lasting between 23 and 26 days.Associated irradiation processing facilities include the HydraulicTube Facility, Pneumatic Tube Facilities for Neutron Activation Analysis (NAA) and Gamma Irradia- tion Facility. Massachusetts Institute of Technology Reactor Massachusetts Institute ofTechnology Reactor (MITR) is a 5-MW tank-type research reactor. It has three positions available for in-core fuel and materials experiments over a wide range of conditions.Water loops at pressurized water reactor/boiling water reactor (PWR/BWR) conditions, high- temperature gas reactor environments at temperatures up to 1400°C and fuel Annular fuel rig in the MITR core. Downward view of the PULSTAR reactor pool. tests at light water LWR temperatures have been operated and custom conditions can also be provided. A variety of instrumentation and support facilities are available. Fast and thermal neutron fluxes are up to 1014 and 5 x 1014 n/cm2 -s. MITR has received approval from the Nuclear Regulatory Commission for a power increase to 6 MW, which will enhance the neutron fluxes by 20 percent. North Carolina State University PULSTAR Reactor The PULSTAR reactor is a 1-MW pool- type nuclear research reactor located in North Carolina State University’s (NCSU) Burlington Engineering Laboratories.The reactor, one of two PULSTAR reactors built and the only one still in operation, uses 4 percent enriched, pin-type fuel consisting of uranium dioxide pellets in zircaloy cladding.The fuel provides response characteristics that are very similar to commercial light water power reactors.These characteristics allow teaching experiments to measure moderator temperature and power reactivity coefficients including Doppler feedback. In 2007, the PULSTAR reactor produced the most intense low-energy positron beam with the highest positron rate of any comparable facility worldwide.