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Complicated physical processes govern diffusional fission gas release in nuclear fuels. Besides the physical problem there is a numerical problem since some solutions of the underlying diffusion equation have numerical errors that by far exceed the physical details. In this paper the two algorithms incorporated in the TRANSURANUS code, the URGAS and the new FORMAS algorithm are compared. The previously reported deficiency of the most elegant and mathematically sound FORMAS algorithm at low release could be overcome. Both algorithms are simple, fast, without numerical problems, insensitive to time step lengths and well balanced over the entire range of fission gas release. They can be made available on request as FORTRAN subroutines.

Additional information

Authors: LASSMANN K, JRC Institute for Transuranium Elements, Karlsruhe (DE)
Bibliographic Reference: An Oral report given at: The International Seminar on Fission Gas Behaviour in Water Reactor Fuels. Held at: Cadarache (FR) 26-29 September 2000
Record Number: 200013177 / Last updated on: 2001-03-20
Original language: en
Available languages: en
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