Title: Mass Spectroscopic Measurements of Fission Product Effusion from Irradiated Light Water Reactor Fuel
Citation: Nuclear Science and Engineering vol. 124 p. 436-454
Publication Year: 1996
JRC N°: JRC12243
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC12243
Type: Articles in periodicals and books
Abstract: Irradiated LWR fuel from the BR3 reactor was thermally annealed up to 2500 K in a Knudsen-cell, and the effusing vapors were measured by mass spectrometry. The experiments provide data on the stoichiometry evolution of the fuel during release as well as a reliable method to evaluate the diffusion coefficients of volatile and less volatile products. The analysis of the data starts from diffusion on Xenon which clearly shows three typical release stages respectively controlled by radiation damage annealing, self-diffusion and matrix vaporization. The experimental measurements are also in agreement with the predictions of intragranular trapping models. Barium and Caesium showed faster release than Xenon, the former being likely diffusion atomically to the grain boundaries where no evidence of formation of stable zirconates was found. These results were compared with those obtained by a burnup-simulated fuel, where Barium was initially present in a perovskite phase, producing essentially different release patterns.
JRC Directorate:Nuclear Safety and Security

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