This report contains a summary of irradiation testing in the Advanced Test Reactor (ATR) of Nuclear Technology Research & Development Accident Tolerant Fuels (ATF-1) experiments performed at the Idaho National Laboratory (INL) in FY 2019. Additionally, three capsules met the sponsor-specified burnup targets, and five capsules were shipped from the ATR to the Hot Fuels Examination Facility (HFEF) at INL.

A dual-channel scanning microprobe ͑dual probe͒ has been developed for simultaneous mapping of microwave and optical properties of a sample. It employs a tunable open-ended coaxial resonator with a tapered and metal-coated fiber optic tip, from which microwave and light can be emitted/ collected simultaneously. The microwave channel of this probe, operating at 1.5 GHz, can detect changes in sheet resistance (R x ) above 293 m⍀ with a spatial resolution ranging from 5 to 10 m. The optical channel, on the other hand, has a spatial resolution ϳ1 m. The poorer spatial resolution in the microwave channel was attributed to its lower sensitivity. Imaging of dielectric grid and high-T c superconducting microwave resonators was carried out at ambient temperature.

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BSU-8242 3 DPA As-Run Physics Analysis 11. Conclusions/Recommendations: An MCNP full core physics model was used to calculate the as-run heat rates, flux values, fluences, and DPA for each test specimen within the BSU-8242 experiment. The heating rates ranged from 6.67 to 17.37 in position A-6 (300C 3 DPA Capsule), depending on the material and axial location; the heating rates ranged from 5.14 to 16.38 in the A-7 position (400C 3 DPA (Y)), and the heating rates in the A-8 position (400C 3 DPA (X)) ranged from 5.25 to 9.81 . The average neutron flux experienced by the BSU-8242 specimens in position A-6 was ~9.08× 10 14 2 • , while the average fluence was ~1.47 × 10 22 2 ; The average neutron flux in position A-7 was ~8.31× 10 14 2 •