b'Boiling Transition (Dryout) Testing of FeCrAl CladdingPrincipal Investigator: Ken KaneTeam Members/ Collaborators: Soon Lee, Sam Bell, Bruce Pint and Nick BrownA novel experimentAwas then programmed into the SATS novel experiment designed to simulate cyclic dryout inrig and consisted of first heating from has been designed toboiling water reactors has beenroom temperature (RT) to 300C, then simulate cyclic dryoutdeveloped utilizing the severe accidentrapidly heating to 650C, at which has proven to betest station (SATS). point IR furnace was turned off and effective and pertinent,Project Description: cladding assembly allowed to air cool easily demonstrating theCyclic dryout is simulated by modi- to 300C, signaling one completed mechanical superiorityfying the out-of-cell Loss of Coolantcycle and immediately ramping back of C26M over Zircaloy-2. Accident (LOCA) burst test. Testingup to 650C. Once the thermal cycling was performed to determine theregime was programmed, claddings temperature cycling capabilities ofwere positioned within a quartz reac-the LOCA burst rig. After capabilitiestion tube environment and subjected were determined, internally pres- to the simulated cyclic dryout. During surized claddings were subjectedtesting, temperature was monitored to rapid thermal cycling in a steamat four different locations across the environment until cladding fails viacladding, with a central thermocouple burst. Lifetime during cyclic dryoutcontrolling the preprogrammed was found to be correlated with uppertemperature regimes. 300-650C thermal cycle temperature, internallifetimes for Zircaloy-2 varied from 1-4 pressure, and cladding material. cycles depending on internal pressure. During identical testing, C26M cladding Accomplishments: did not fail. To generate failure criteria Testing was performed on C26M FeCrAlfor C26M, it was necessary to increase and Zircaloy-2 cladding to determinecycling from 300-650C to 300-lifetime during cyclic dryout as a700/750C. Actual cladding tempera-function of thermal cycle and internaltures, for both Zircaloy-2 and C26M, pressure. It was first necessary towere slightly higher than programmed determine the fastest possible heatingtemperatures due to thermal gradients rate using the infrared (IR) furnace. Thewithin the furnace. Cyclic dryout maps maximum heating was determined toillustrating the superiority of C26M be 15-17C/s, which is significantlyover Zircaloy-2 regarding cyclic dryout higher than the 5C/s heating ratelifetimes were drawn.used during standard out-of-cell LOCA burst testing. Thermal cycling 98 2020|AFC ACCOMPLISHMENTS'