新クロスオーバ研究「照射・高線量領域の材料挙動制御のための新しいエンジニアリング」,6; 実燃料の照射後歪の観察

New cross-over project new engineering to control materials behaviour at high energy and high fluence irradiation, 6; Crystal lattice strain changes in irradiated fuel

中村 仁一 ; 天谷 政樹  ; 本田 順一; 畠山 祐一; 更田 豊志; 木下 幹康*

Nakamura, Jinichi; Amaya, Masaki; Honda, Junichi; Hatakeyama, Yuichi; Fuketa, Toyoshi; Kinoshita, Motoyasu*

高燃焼度燃料ペレット(燃焼度4060GWd/t)の結晶格子歪,結晶子径(結晶子の粒径)及び結晶粒間に生じる不均一歪を測定することにより、燃焼に伴うペレット内部の結晶組織変化状態を調べ、組織変化に及ぼす照射の影響を検討した。

Based on the micro-X-ray diffraction results, lattice parameters and diffraction peak broadenings (increase of FWHM of diffraction peak) of high burnup UO pellets were measured. Crystallite diameter, which corresponds to subdivided grain diameter, and strain distribution between crystallites can be evaluated from the increase of FWHM of diffraction peak by using Willamson-Hall method. Basesd on these data, the crystal microstructural change during irradiation was examined and the effects of irradiation for microstructure.