Two, 1/5 scale, models of CANDU fuel bundles used in an experiment aimed to simulate effects that could lead to a disassembly of a CANDU core. The 10 cm long by 2 cm diameter units are made of tungsten and equipped with heaters and thermocouples to allow the simulation of fuel behavior under very low-probability, loss-of-cooling conditions. They were part of the Core Disassembly Facility (CDF) at the Chalk River Laboratories where up to four CANDU-type, 1/5 scale, channels were used to investigate pressure-tube sag under various conditions. Tungsten, which has a high density as well as a high melting point, was used as the material for the bundles to simulate the behaviour of uranium oxide under similar conditions.
