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論文

Development of transient behavior analysis code for metal fuel fast reactor during initiating phase of core disruptive accident

太田 宏一*; 尾形 孝成*; 山野 秀将; 二神 敏; 島田 貞衣*; 山田 由美*

Proceedings of 30th International Conference on Nuclear Engineering (ICONE30) (Internet), 8 Pages, 2023/05

The experimental analyses of the U-Pu-Zr fuel pin behavior during transient overpower (TOP) tests were performed by CANIS, and the residual cladding wall thickness and molten region of the fuel alloy after the tests, and the reactivity inserted by molten fuel extrusion before the fuel pin failure were compared with the experimental results. On the basis of these analysis results, detailed calculation models were developed for and implemented into CANIS to be made it possible to consider changes in the local properties of the fuel alloys due to redistribution of fuel constituents during steady-state irradiation and in the cladding thinning rate depending on the fuel-cladding interface temperature. The modified CANIS properly predicted fuel behavior and resulting reactivity changes before fuel pin failure in TOP events.

論文

Effect of extrusion ratio in hot-extrusion on kink deformation during compressive deformation in an $$alpha$$Mg/LPSO dual-phase magnesium alloy monitored by ${it in situ}$ neutron diffraction

Harjo, S.; Gong, W.; 相澤 一也; 川崎 卓郎; 山崎 倫昭*; 眞山 剛*; 河村 能人*

Materials Transactions, 64(4), p.766 - 773, 2023/02

https://doi.org/10.2320/matertrans.MT-MD2022004
 被引用回数：4 パーセンタイル：87.83(Materials Science, Multidisciplinary)

To elucidate the effect of extrusion ratio in hot-extrusion on the deformation behavior during compression of Mg$$_{97}$$Zn$$_{1}$$Y$$_{2}$$ alloy containing about 25-vol% long-period stacking ordered phase (LPSO) in the HCP structured $$alpha$$ matrix ($$alpha$$Mg), ${it in situ}$ neutron diffraction measurements were performed under compressive loading using four types of samples: as-cast and after hot extrusion at 623 K with extrusion ratios of 5.0, 7.5 and 12.5. The macroscopic yielding was observed to appear by the occurrence of basal slip of $$alpha$$Mg in the as-cast sample and at the onset of twinning in the hot extruded samples. The applied stress to initiate slip, twinning, and kinking increased by hot extrusion and then decreased with increasing extrusion ratio. LPSO shared higher stress than $$alpha$$Mg and the ratio to the strength increased as the extrusion ratio increased.

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