Title: Evolution of spent nuclear fuel in dry storage conditions for millennia and beyond
Authors: WISS ThierryHIERNAUT JEAN-POLROUDIL D.COLLE Jean-YvesMAUGERI EmilioTALIP ZEYNEPJANSSEN ARNERONDINELLA VincenzoKONINGS RudyMATZKE HjWEBER William
Citation: JOURNAL OF NUCLEAR MATERIALS vol. 451 no. 1-3 p. 198-206
Publisher: ELSEVIER SCIENCE BV
Publication Year: 2014
JRC N°: JRC88132
ISSN: 0022-3115
URI: http://www.sciencedirect.com/science/article/pii/S0022311514001822
http://publications.jrc.ec.europa.eu/repository/handle/JRC88132
DOI: 10.1016/j.jnucmat.2014.03.055
Type: Articles in periodicals and books
Abstract: Significant amounts of spent uranium dioxide nuclear fuel are accumulating worldwide from decades of commercial nuclear power production. While such spent fuel is intended to be reprocessed or disposed in geologic repositories, out-of-reactor radiation damage from alpha decay can be detrimental to its structural stability. Here we report on an experimental study in which radiation damage in plutonium dioxide, uranium dioxide samples doped with short-lived alpha-emitters and urano-thorianite minerals have been characterized by XRD, transmission electron microscopy, thermal desorption spectrometry and hardness measurements to assess the long-term stability of spent nuclear fuel to substantial alpha-decay doses. Defect accumulation is predicted to result in swelling of the atomic structure and decrease in fracture toughness; whereas, the accumulation of helium will produce bubbles that result in much larger gaseous-induced swelling that substantially increases the stresses in the constrained spent fuel. Based on these results, the radiation-ageing of highly-aged spent nuclear fuel over more than 10000 years is predicted.
JRC Directorate:Nuclear Safety and Security

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