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Abstract
In nuclear fuel fabrication facilities, fine particles of UO2 deposit on the surfaces of walls, equipment, ventilation filters, etc. which may finally become uranium-bearing wastes when these items are removed or replaced. Radon is one progeny of uranium and emanates from those wastes. It is very difficult to experimentally simulate such radon emanation, which means it is difficult to measure radon emanation coefficients for those wastes. The present paper theoretically calculated radon emanation coefficients for them assuming UO2 particles remain on the surfaces of such wastes in the distant future when radon is formed in these particles. The calculated average radon emanation coefficient was 0.03. With more complete information about particle size distribution from fuel manufacturers, this method would be able to provide better predictions.