Analytical Modeling of Fission Product Releases by Diffusion from Multicoated Fuel Particles

GELBARD, FRED

Sandia National Laboratories

关键词: Numerical Solution;    Fuel Particles;    Diffusion;    Implementation;    Simulation;   

DOI  :  10.2172/809605
RP-ID  :  SAND2002-3966
RP-ID  :  AC04-94AL85000
RP-ID  :  809605

美国|英语

来源: UNT Digital Library

【 摘 要 】

Three levels of fission product diffusional release models are solved exactly. First, the Booth model for a homogeneous uncoated spherical fuel particle is presented and an improved implementation is suggested. Second, the release from a fuel particle with a single barrier layer is derived as a simple alternative to account for a coating layer. Third, the general case of release from a multicoated fuel particle is derived and applied to a TRISO-coated fuel. Previous approaches required approximate numerical solutions for the case of an arbitrary number of coatings with arbitrary diffusivities and arbitrary coating interface conditions.