b'the fuel rod with a suite of state ofpressure in the rodlet plenum. TheFigure 2. MCNP predictions and the art and first of a kind instrumentspurpose of the ATF-RIA-1 tests is togamma spectroscopy measurements of to collect relevant data for post-testcommission the MARCH-SERTTAthe core-to-specimen power coupling factor of ATF-RIA-1-Gamma rodlet with analysis of the experiments. Thecapsule and instrumentation forfive 4.95wt% and five 0.74wt% U 235 fuel instruments include thermocouplesRIA testing in a static water envi- pellets. Average measured to predicted and optical-fiber-coupled pyrom- ronment in TREAT. Demonstratingdeviation was less than 6%.eters to measure the temperatureand proving the capabilities of the of cladding and water, a pressureMARCH-SERTTA capsule is crucial for transducer to monitor capsule pres- planned follow-on testing of ATF as sure, an electro-impedance detectorwell as very high burnup LWR fuels. to monitor boiling around theThese tests will play a crucial role in rod, and linear variable differentialmeeting industries needs to support transformer (LVDT) to monitorlicensing these fuels.axial elongation of the fuel rod and 2020|AFC ACCOMPLISHMENTS 105'