[2J10-14] Fuel Cladding Tube 2

[2J12] R&D of ODS ferritic steel cladding for maintaining fuel integrity at accident condition (3)

(8)a/a¢ phase separation effects (Evaluation summary)

Akihiko Kimura¹, *Kiyohiro Yabuuchi¹, Tadahiko Torimaru², Shigeharu Ukai³, Naoko Oono³, Takeji Kaito⁴, Shigenari Hayashi⁵ (1. IAE, Kyoto University, 2. NFD, 3. Hokkaido University, 4. JAEA, 5. TIT)

Keywords:Accident tolerant fuel cladding

Thermal aging (475℃, 10,000hr) and ion-irradiation (475℃, 8dpa) effects were investigated for FeCrAl-ODS ferritic steels. Hardness, tensile tests and impact tests were crarried out for long term aged specimens. The effects of phase separation of Fe/Cr was invesitated and it was cleared that the age-hardening was due to the phase separation. The ion-irradiation resulted in no phase separation in this irradiation conditions. Lifeime of the candidate materials is evauated on the basis of the results of aging and ion-irradiation experiments.