کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7965075 | 1514179 | 2015 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Xe diffusion and bubble nucleation around edge dislocations in UO2
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی هسته ای و مهندسی
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چکیده انگلیسی
Recently it has been suggested that dislocations, generated by radiation damage, may increase the rate of fission gas diffusion from the fuel grains, an affect which is at present not incorporated into fuel performance codes. Therefore, we perform molecular dynamics simulations employing empirical potentials to investigate the diffusion of Xe atoms around edge dislocations in UO2 to establish the importance of this pathway for fission gas release. The results suggest that for isolated atoms near the dislocation the activation energy for Xe diffusion is dramatically reduced relative to the bulk. However, Xe atoms diffusing along the dislocation cluster together to form small bubbles, these bubbles incorporate all of the isolated mobile Xe atoms thereby inhibiting fast diffusion of Xe along the dislocation core.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Nuclear Materials - Volume 466, November 2015, Pages 634-637
Journal: Journal of Nuclear Materials - Volume 466, November 2015, Pages 634-637
نویسندگان
Samuel T. Murphy, Paul Fossati, Robin W. Grimes,