b'Figure 1. MiniFuel RB irradiation vehicle accommodating 15 MiniFuel targetsMiniFuel design provides additional(300-400C) and damage of 2 or 8 testing positions, fifteen targets beingdisplacements per atom (dpa) [4]. able to be inserted in an aluminumThe specimens are short PWR clad-basket in one RB position versus theding segments about 24 mm long 9 targets accommodated by a VXFand 9.5 mm diameter. In addition, basket. This design would allow UO 2 PWR geometry plane-strain and fuel specimens to reach tempera- tensile tube specimens about 12 mm tures beyond 1,000C, enablinglong were also inserted in HFIR for observation of fission gas release forirradiation. The plane-strain specimen moderate burnups in the range ofgeometry is a standard tube specimen 4050 MWd/kg-U. featuring two notches at each end of the specimens for hoop strain in plain Cladding tube specimens strain state measurements. The tensile irradiation testing tube specimen geometry presents two Coated-zirconium cladding tuberings connected by two gauge regions specimens were inserted in rabbitfor uniaxial tension testing. A rabbit capsules for HFIR irradiationcapsule can accommodate two 24-mm testing at temperatures relevant forlong tube specimens and four 12-mm pressurized-water reactors (PWRs)long plane-strain or tensile specimens. 2021|AFC ACCOMPLISHMENTS 155'