b'Dynamic System Scaling (DSS) for Enhanced Interpretation of Irradiation TestsPrincipal Investigator: Alexander DuenasTeam Members/ Collaborators: Dan Wachs, Guillaume Mignot, Jose Reyes, Qiao Wu, and Wade MarcumDSS can provideE fforts for accelerating fuelDSS can be used to support fuel qualification are leveraging newperformance code validation studies, objective metrics toirradiation experiments withexperiment design, and evaluating identify and quantifyreduced geometric length scales andsimilitude between datasets from distortions betweenreactor conditions to generate testdifferent test reactors and irradiation scaled SET and IET data on shorter timelines and provideconditions. Emerging Nuclear data and full-scale data necessary for fuel performanceRegulatory Commission (NRC) LWR conditions. code validation studies. Irradiatedguidance on fuel qualification fuel performance test data producedacknowledges the need to from test reactors often are atdemonstrate that experiment data is reduced or altered geometric lengthrepresentative of full-scale reactor scales and are not typically capable ofconditions by quantifying the replicating exact initial, boundary, orimpact from geometric and temporal test conditions in light water reac- distortions. This approach will tors (LWR). Distortions introducedprovide researchers with the tools by these varying power, geometricsto design irradiation experiments and temporal scaling factors needat altered geometric and temporal to be identified and quantified toscales that produce test data scalable determine how representative testto LWR conditions.data is of the full-scale nominalRecent test data from the Separate conditions in a commercial reactor.Effects Test Holder (SETH) and The Dynamical System Scaling (DSS)Critical Heat Flux Static Environment methodology can quantify scalingRodlet Transient Test Apparatus distortions over transients and deter- (CHF-SERTTA) experiments at TREAT mine similitude between scaled fuelwill be used to analyze separate rodlet performance and full-lengtheffects experiments that replicate fuel rod performance. distinct fuel and cladding thermal Project Description: and mechanical responses from DSS is being used to develop aReactivity Initiated Accident (RIA) framework to quantify transientpower pulses. The objective will scaling distortions in reduced-scalebe to identify regions of scaling fuel rodlets under transient testing.agreement which can allow data This scaling theorys utility is beingfrom multiple separate effects test to able to identify regions of localcapture separate phases of transients. scaling distortion and regions ofThe potential outcome from this is similitude throughout a transient.that the number of integral effects 100 2021|AFC ACCOMPLISHMENTS'