b'Figure 4. Temperature and pressure histories for the in-cell LOCA burst & fragmentation test HBR#1.fuel rod sectioning, metallographic(2) in-cell refabrication and SATS burst mounting and polishing, fuel leaching,testing performed with an HB Robinson outer oxide layer removal, limited fuelHBU cladding segment, (3) post-SATS removal for end-plugs, and end-plugtest cladding and fuel characterization welding. After assembly of the testAside from evaluating changes in train, two Type-S thermocouples wereburst pressure and temperature due strapped to the outer surface of theto ARMOR coating, out-of-cell burst cladding, approximately 2 inches abovebehavior was quantified in a non-the sample centerline. One of them wasdestructive manner via structured light used to control the sample temperature.scanning. The aim was to quantify The fragmentation test was conductedeffectiveness of ARMOR coating to Figure 3. The Severe Accident Testin steam at 1,000C, but without waterphysically impart better tolerance Station pictured during HBR#1quench. The full LOCA fragmenta- in LOCA scenario by reducing burst testing. The test station includestion test sequence included heatingsurface area. Images of as-received and the integral LOCA testing modulethe fuel segment in flowing steam to (foreground furnace) and the BDBA300C and internally pressurizing theburst uncoated Zircaloy-4 cladding with high-temperature furnace testassociated structured light scans are apparatus (behind). fuel segment to 1,200 psi, increasingshown in Figure 2.the temperature to 1,000C at 5C/s, holding in steam for 120s at 1,000C,For in-cell fuel fragmentation testing, cooling at 3C/s to 800C, and furnaceFigure 3 shows the temperature and cooling from 800C to room tempera- pressure histories for the in-cell LOCA ture. After fragmentation testing, strainfragmentation test HBR#1. After the measurement of the burst region andHBR fuel specimen was assembled to sieve analysis of fuel fragmentationthe test train, two Type-S thermocouples were performed. were strapped to the outer surface of the Accomplishments:cladding approximately 2 inches above The main activities in FY19 included:the sample centerline. One of these was (1) industry supported out-of-cellused to control the furnace power to give a hold temperature of 1,000C at testing of ATF concept GE-Globalthat location. The fuel fragmentation test Nuclear Fuels (GNF) ARMOR cladding,was conducted in steam at 1,000C, but without water quench.144 2019|AFC ACCOMPLISHMENTS'