Steam Oxidation and Burst Testing in the Severe Accident Test Station

Steam Oxidation, Burst and Critical Heat Flux Testing of FeCrAl Cladding in the Severe Accident Test Station

“…designated B135Y (13Cr-5Al) and B154Y (15Cr-4Al) in Figure 4 [9]) because of the higher tensile properties attributed to the Mo and Si additions [8], Table 1. As reported previously [36], the first batch of C26M specimens did not show improved burst temperatures compared to the 1 st generation FeCrAl results and this was consistent with the low tensile properties reported for this batch of material, which were attributed to processing issues [39]. In the 2 nd batch of C26M tubing, the processing issues were resolved, and the burst temperatures were consistently higher than the 1 st generation "B" alloy results.…”

“…For the "B" material, a large burst occurred at only 85 MPa [9] so the C26M material is showing an increase in both the burst temperature and the stress where a large burst occurs. The previous testing for C26M was all at lower stress levels and only small openings were observed [36] similar to the bursts marked by arrows in Figure 5. Additional testing is in progress to further study the burst behavior of C26M in the 90-130 MPa stress range and obtain statistical information on the burst behavior.…”

“…Now that more commercial tubing is available, additional burst testing has been conducted. The results for the first two batches of C26M material were reported previously [36]. The LOCA burst tests were conducted in the SATS on 30 cm long tube specimens that were filled with ZrO2 pellets and internally pressurized to a fixed value followed by heating in steam to 1200°C at 5°C/s.…”