b'Figure 2. 3D nCT renderings of SETH-D and initial visual inspections showing regions of ballooned cladding and localized features such as pitting near thermocouple mounting points. The false colors shown in the nCT rendering have no scale or specific quantitative value but are applied to highlight finer features in the tomography which otherwise are difficult to visualize.Accomplishments: ment of complex and disrupted fuel TREATs first year of experimentalsamples. While GET shows promise, operations since 1994 was focusedadditional development is needed to on demonstrating new LWR relevantincrease spatial resolution while at the transient shapes representing Reac- same time reducing counting time tivity-Initiated Accidents (RIAs) andfor low source-strength specimens. Loss of Coolant Accidents (LOCAs).The commissioning demonstration The successful outcome of theseof the first digital neutron computed efforts paved the way for the firsttomography on irradiated fuel has fueled experiments using a newproven successful and valuable for irradiation vehicle system, associatedboth its speed and resolution ofinstrumentation, including noveldata acquisition. application for pyrometry and otherIn addition to demonstrating and support systems which were success- commissioning the post irradiation fully commissioned. These effortsexamination capability, the post irra-were paralleled by development ofdiation exams confirmed the results advanced non destructive post-irradi- of the predicted irradiation conditions ation examination technique develop- and in situ instrumentationnamely, ment of Gamma Emission Tomog- that no cladding melting would occur raphy (GET) and digital neutron- in Separate Effects Test Holder (SETH) computed tomography (nCT) thatC, that SETH D was very near the were specifically focused on assess- cladding melt temperature, and that 114 2020|AFC ACCOMPLISHMENTS'