Conference Proceedings Paper
Analytical and Experimental Assessment of CANDU Fuel Sheath Integrity Under Post Dryout Conditions
NURETH-14 - 2011 September 25-30
Mohamed E. Shawkat (AMEC NSS Ltd.)
Hisham Hasanein (AMEC NSS)
Yuksel Parlatan (Ontario Power Generation)
Todd Daniels (Ontario Power Generation)
Mohamed Bayoumi (AMEC NSS Ltd.)
Hassan Albasha (Bruce Power)
The experiments that investigated the CANDU fuel sheath behavior under different pressures,
temperatures, oxidizing environment, material structure (as-received or thermally treated to
attach appendages), and heating rates were reviewed and assessed to determine the limits of postdryout
duration, sheath temperature, and pressure difference across the sheath required to ensure
the fuel sheath integrity. A number of burst curves at different heating rates were studied. Timeat-
temperature fuel sheath failure maps were developed based on temperature ramp and
isothermal experiments for the 28-element fuel bundle. Analytical time-at-temperature fuel
sheath failure maps were also developed for both of 28- and 37-element fuel bundles using the
ELOCA fuel analysis computer code and were compared to the experimental time-at-temperature
sheath failure maps. Time-at-temperature sheath failure maps could be used as a simple and
effective screening tool to demonstrate fuel sheath integrity during postulated design basis
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