Thermal Conductivity Data
Tests at ORNL show very high strain tolerance as needed to withstand Reactivity
Insertion Accidents (RIA)
Tests of similar SiC composites show strength retention to very high temperatures,
thus affording the opportunity to allow DNB during transients, without damage to the
cladding. This would enable larger power uprates of LWRs.
The internal SiC monolithic layer of the duplex cladding is designed to hold fission gases
during normal and transient operation to very high internal pressures, thereby allowing extension
of the burnup capability. Containment integrity at internal gas pressures in the range of 8000 to
9000 psi have been demonstrated in 15 x 15 fuel cladding geometry.
Short term autoclave tests in 300 C water demonstrate a lower surface recession rate
than advanced zirconium alIoys. Longer term corrosion tests are planned.
No data yet to report.