2018 | AFC ACCOMPLISHMENTS 90 tubes (without Mo and Si additions) and (2) the decades of experience with stainless steel and Zr-based claddings. Figure1 shows the integral LOCA furnace test equipment, which is part of the severe accident test station (SATS) at Oak Ridge National Laboratory (ORNL).The LOCA burst tests were conducted in the SATS on 30 cm long tube specimens filled with ZrO2 pellets and internally pressurized to a fixed value followed by heating in steam to 1200°C at 5°C/s.The pressure was monitored in the tube during the experiment to determine the burst temperature. During cooling, water was injected into the system at 600°C. Figure 2 shows the prior work and the new results on three batches of C26M.The results are compared to results from the literature for Zr-based cladding and type 304 stainless steel.As the temperature increased in the experiment and the material got weaker, Zr-based alloys typically ballooned (i.e., expanded due to creep) and eventually burst. Previous characterization showed that the stronger FeCrAl alloys tended to just burst without significant deformation.The expectation was that the C26M tubing would outperform the “B” series tubing (e.g. designated B135Y (13Cr-5Al) and B154Y (15Cr- 4Al) in Figure 2 because of the higher tensile properties attributed to the 2wt. %Mo and 0.2%Si additions.The first batch of C26M specimens did not Figure 2: Burst temperature as a function of engineering hoop stress for various cladding materials examined in the SATS (data points from this year and prior years) alongside empirical correlations (lines) from the literature for Zr-alloys and type 304 stainless steel (SS).