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XRF and EPMA results for the distribution of retained xenon in twenty fuel pins are surveyed, to show the progress that has been achieved by combining these methods. One of the main concerns of the paper is the reliability of the XRF and EPMA measurements and the identification of the principal sources of uncertainty. Another is to demonstrate the wealth of new mechanistic information that has been acquired by systematically combining XRF and EPMA with quantitative image analysis (QIA) of the local size distribution of the gas bubbles in the fuel. It is shown that by correlating the three data sets it is possible to establish the distribution of retained gas on the grain boundaries and to estimate the pressure of the gas contained in grain boundary bubbles. It is concluded that often gas release during a reactor power transient cannot be predicted on the basis of simple gas diffusion considerations and that it is not possible to derive a gas diffusion coefficient of general relevance from puncturing data.

Additional information

Authors: MOGENSEN M, Riso National Laboratory, Roskilde (DK);BAGGER C, Riso National Laboratory, Roskilde (DK);WALKER C T, JRC Karlsruhe (DE)
Bibliographic Reference: Article: Journal of Nuclear Materials, Vol. 199 (1993) pp. 85-101
Record Number: 199310595 / Last updated on: 1994-11-29
Original language: en
Available languages: en