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2014 ANNUAL REPORT 33 Top of the HFIR reactor. Aerial view of the ATRC reactor core and bridge. Oak Ridge National Laboratory 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 2.5x1015 ncm2 -s and a peak fast flux of 1.1x1015 ncm2 -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 typi- cally operates seven cycles per year each cycle lasting between 23 and 26 days.Associated irradiation processing facilities include the HydraulicTube Facility PneumaticTube Facilities for Neutron Activation Analysis NAA and Gamma Irradiation Facility. Massachusetts Institute of Technology Reactor Massachusetts Institute ofTechnology MITR is a 5-MW tank-type research reactor. It has three positions available for in-core fuel and materials experi- ments over a wide range of condi- tions.Water loops at pressurized water reactorboiling water reactor PWR BWR conditions high-temperature gas reactor environments at tempera- tures up to 1400C and fuel tests at light water LWR temperatures have Annular fuel rig in the MITR core. Downward view of the PULSTAR reactor pool. 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 5x1014 n cm2 -s. MITR has received approval from the Nuclear Regulatory Commis- sion 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 Universitys 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 coefcients 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.