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Nuclear Science User Facilities 72 Transducers for In-Pile Ultrasonic Measurement of the Evolution of Fuels and Materials Bernhard Tittmann Pennsylvania State University brt4psu.edu Project Description Pennsylvania State University PSU was awarded anATR NSUF program to insert both magnetostrictive and piezoelectric transducers into the Massachusetts Institute ofTechnology Research Reactor MITR for radiation at fluences up to 1021 ncm2 . Ultrasonic measurements of the transducers are being taken in-situ as the transducers are subjected to the neutron flux.The goals of the experiment are to develop a test design including selection criteria for candidate materials and opti- mizing test assembly parameters obtain data from both out-of-pile and in-pile tests conducted at elevated temperatures and compare the accrued data with the expected performance of ultrasonic devices under irradiation conditions. These experiments will enable researchers to design ultrasonic sensors for characterizing the evolution of fuel materials and other nuclear reactor components.The sensors will allow in-situ measurements of material prop- erties and will lead to the development of tools that will monitor the structural health of reactors. Accomplishments In 2014 the following progress was made on the project. The following piezoelectric transducer materials were selected aluminum nitride AlN zinc oxide ZnO and bismuth titanate BiT. Remendur and Galfenol were selected as magnetostric- tive transducers. Assemblies for the magnetostrictive transducers were designed built and tested Figures 1 and 2.Transducer performance was characterized at design temperatures Figures 35. Ground lead weld to cable sheath Power lead weld to cable center conductor Figure 1. Magnetostrictive transducer fabrication. a Silver-palladium is wrapped around an alumina bobbin b the wire is coated with a standoff insulation and heat treated c the wire is coated with an alumina cement and heat-treated a second time d leads are laser-welded to the coax cable and e welded into a pre-fabricated housing.