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 62 Transducers for In-pile Ultrasonic Measurements of Fuels and Materials Evolution Bernhard Tittmann – Pennsylvania State University – brt4@psu.edu Figure 1. 3-D renderings of the ULTRA-capsule as constructed for the irradiation. The piezoelectric sensors are shown in yellow, the magnetostrictive sensors are shown in green, the piezoelectric drop in specimens are shown as gray disks, while the magnetostrictive drop-in samples are shown in a peach cylinder. Current generation light water reactors (LWRs), sodium cooled fast reactors (SFRs), small modular reactors (SMRs), and Next Generation Nuclear Plants (NGNPs) produce harsh environments in and near the reactor core that can severely tax material performance and limit component operational life.To address this issue, several Department of Energy Office of Nuclear Energy (DOE-NE) research programs are evaluating the long-duration irradiation performance of fuel and structural materials used in existing and new reactors.To maximize the amount of information obtained from MaterialTesting Reactor (MTR) irradiations, DOE is also funding development of enhanced instrumenta- tion that will be able to obtain in‑situ, real‑time data on key material character- istics and properties with unprecedented accuracy and resolution. Such data are required to validate new multi-scale, multi-physics modeling tools under development as part of a science-based, engineering driven approach to reactor development. It is not feasible to obtain high-resolution/microscale data with the current state of instrumentation technology. Project Description Ultrasound‑based sensors offer the ability to obtain in‑situ data if it is demonstrated that these sensors and their associated transducers are resistant to high-neutron flux, high-gamma radiation, and high temperature.To address this need, the Nuclear Science User Facilities (NSUF) funded an irradiation, led by Penn- sylvania State University (PSU), at the Massachusetts Institute ofTechnology (MIT) Research Reactor to test the surviv- ability of ultrasound transducers.