Study on coating technic to enhance accident tolerance of fuel cladding, 3; Irradiation behavior of the Cr coated MDA cladding

事故耐性向上を目指した燃料被覆管のコーティング技術に関する研究,3; CrコーティングしたMDA被覆管の照射挙動

Mohamad, A. B. ; Chien, J.; 井岡 郁夫  ; 鈴木 恵理子   ; 近藤 啓悦  ; 根本 義之  ; 大久保 成彰   ; 山下 真一郎   ; 岡田 裕史*; 佐藤 大樹*

Mohamad, A. B.; Chien, J.; Ioka, Ikuo; Suzuki, Eriko; Kondo, Keietsu; Nemoto, Yoshiyuki; Okubo, Nariaki; Yamashita, Shinichiro; Okada, Yuji*; Sato, Daiki*

As a candidate for accident tolerent fuel (ATF) cladding tubes, chromium (Cr) coated Zry cladding tubes are being developed. To realize the Cr-coated Zry cladding for future cladding application, the integrity of this material needs to be confirmed with the reactor environment conditions. In order to understand an effect of irradiation on the Cr-coated Zry cladding, ion irradiation test is carried out on the cross-sectional specimens. In this study, the following content mainly focuses on the microstructural evolution and mechanical behavior induced by ion irradiation in Cr-coated Zry cladding. The 10 MeV-Fe irradiation was chosen to induce the damage on the cross section of the Cr-coated Zry cladding. The sample was irradiated at 350 C and the peak irradiation damage was approximately 30 dpa. TEM-EDS shows that the Fe-enrichment peaks are observed around 15 nm at the interface regions between the coating and the Zry substrate for the sample irradiated up to 30 dpa. In addition, the hardness of irradiated sample is higher compared to that un-irradiated sample as result of irradiation-induced hardening. The details of the irradiation effect on the un- and irradiated Cr-coated Zry cladding will be discussed in detail during the presentation.