b'Progress and Accomplishments of AFC Experiments in ATRPrincipal Investigator: Chris Murdock, Nicolas Woolstenhulme and Colby Jensen, INLTeam Members/ Collaborators: Randy Fielding, Chris Murdock, Dan Chapman and Emily Swain (INL)The near-term focusT he Advanced Fuels CampaignProject Description: (AFC) series of irradiation testsThe AFC irradiations have been for these irradiationhave long been underway at thedivided into 4 major campaigns tests is to developAdvanced Test Reactor (ATR). Theseto date (AFC-1 through -4) with the data necessaryirradiations have addressed researchseveral incremental sub-campaigns to select the mostand development (R&D) needs fordenoted by a letter (e.g., AFC-3A, promising design(s),many of the key benefit areas of-3B). Depending on desired burnup, enable irradiation ofadvanced fuels in fast spectrum reactorssome rodlets can take several years lead test assembliesincluding actinide transmutation, fuelto complete irradiation. As a result, in the Versatile Testutilization through ultra-high burnupthese experiment sub-campaigns Reactor, and pave thefuels, and disposition-facilitating directtypically represent a new batch way for industrial usedisposal once-through fuel systems. Theof rodlets produced and shuffled of advanced metal fuelsAFC tests simulate sodium fast reactorinto the irradiation positions with improved benefits(SFR) test conditions in a thermalduration ATRs refueling outages for utilization economyspectrum test reactor by placing fueland occasionally causing main and dispositionrodlets in capsules with engineered gascampaigns to overlap slightly in pathways. gaps to elevate specimen temperaturethe irradiation schedule. These while surrounding the capsules withnew specimen batches have often cadmium thermal neutron filters tocorresponded with new fabrication achieve representative fast reactordevelopments, sharpened research neutronic conditions. Typically, irra- focus areas resulting from previous diation has been performed in ATRstest postirradiation exams (PIE), outboard A positions where proximityand other refinements based on to driver fuel favors fast neutroninput from academic, industrial, populations. This approach has beenand international partners. The compared to historic tests performed inAFC-1 and -2 irradiations are now genuine sodium fast reactors with fairlycomplete and successfully addressed good results. research needs for several fuel compositions including both metallic 200 2019|AFC ACCOMPLISHMENTS'