[2G01-04] Evaluation and Analysis Technology

11:15 AM - 11:30 AM JST(2:15 AM - 2:30 AM UTC)

[2G03] Development of ultra-high temperature in-situ observation technique for nuclear fuel(8) Comparison analysis with thermodynamic phase diagram for the UO2-ZrO2 reaction at high temperatures

*Ayumi ITOH¹, Kenji KONASHI², Yuji ARITA³, Tsuyoshi YAITA^4,5, Goro SHIBATA⁴ (1. Science Tokyo, 2. Tohoku Univ., 3. Fukui Univ., 4. JAEA, 5. QST)

Keywords:

XAFS-XRD,severe accident,UO2-ZrO2,thermodynamic evaluation

Chemical structural changes in the UO₂-ZrO₂ system during heating and cooling obtained by in-situ XRD/XAFS high temperature experiments were compared with the phase diagram to investigate the applicability of thermodyanmics to beyond-design-based-accident (BDBA) behavior of fuel. Also, thermodyanmic evaluation of the Fe-U-Zr-O sample used for STXM analysis will be reported.