b'Figure 2. TWIST instrumentationdrawings, comprehensive neutronic,and unique blow-down design in heat transfer, thermal-hydraulic, andTREAT is expected to fill a critical gap structural analysis of the test devicein testing for both extended burnup to meet all associated testing require- and new fuel designs. To date, the ments. This milestone representsout-of-reactor demonstration of the the culmination of several years ofLOCA device has provided valuable work by a large multidisciplinarylessons learned regarding fabrication and multifacility team. The renewedand assembly of the TWIST capsule.in-pile LOCA capability in the world 154 2022|AFC ACCOMPLISHMENTS'