b'Pressure, temperature, and opticalthermocouples in contact with theFigure 2. Fuel sample on the SiC holder measurements are collected tofuel holder and with additionalat a) 460 and b) 0.3 seconds after quantitatively determine the kineticsindirect monitoring via pyrometry. showing sample disappearance. The fuel piece is shown in the center of of gas release and correlate thisAs this capability is developed,panel a) with the associated cladding release with visual changes in thethis device provides a significantsegment detached above the fuel to fuel. Heating occurs inside a smallthe leftvacuum system up to 800 capability at ORNL to evaluate gas where the sample temperaturerelease of small, irradiated fuel is carefully monitored.With thesamples. Samples can be extracted system under 1000 Pa absolutefrom commercial or research pressure, approximately 0.07 molesreactor irradiated fuel samples instantaneously released gas canand be visualized during heating be resolved during heating. Onceoperations. This capability will released, gas in the chamber isenable experimental campaigns collected in charcoal traps for Kr-85to evaluate fission gas release for activity determination, followedspecific radial portions of fuel, which by ultimate release into the hotwill contribute to the knowledge cells. Temperature is measured byof accident progression in current commercial light water reactors. 2022|AFC ACCOMPLISHMENTS 97'