b'2.1 HIGHLIGHTSNational LWR TestbedPrincipal Investigator: Nick WoolstenhulmeTeam Members/ Collaborator: Dave Kamerman, Nate Oldham, Colby Jensen, Clint Baker, Chris Petrie, Annabelle LeCoq, Kory Linton, Gordon Kohse, and David CarpenterWell featured hot cell Post Irradia-tion Examination (PIE) capabilities also accompanied these reactors campuses.Less than half of these reactors continue to operate today and general inactivity in LWR research areas over the preceding couple of decades caused atrophy of their LWR capabilities. During this time, LWR testing needs were met by a few international facilities which gradually consolidated over the years until only the Halden Boiling Water Reactor (HBWR) remained. The accident at Fukushima combined with economic challenges facing LWR plants drove a resurgence of interest in LWR fuel technology development for Accident Tolerant Fuels (ATF), High Burnup (HBu) license extensions, and other data needs drove revitalization of some LWR testing infrastructure using the United States four remaining fuels and materials test reactors. The more recent and unexpected closure of HBWR obviated other capabilities that were needed and thus started a second wave of capability develop-ment is now underway to reclaim Figure 1. ATF-1 and ATF-2 A pproximately 40 years agothese gaps. Lastly, strategic planning rodlet holder designs there were at least 9 specialhas been undertaken so that the LWR purpose material test reactorstestbed remains a long-lived national in the United States with relevantcapability with forethought in devel-environments and capabilities foroping its capabilities toward the next irradiation testing Light Watergenerations of water-cooled reactor Reactor (LWR) fuels and materials.fuel technology.16 2021|AFC ACCOMPLISHMENTS'