Transient burst properties of ODS steel cladding for evaluating sever accident

Inoue, Toshihiko ; Sekio, Yoshihiro  ; Otsuka, Satoshi   ; Yano, Yasuhide  ; Tanno, Takashi  ; Oka, Hiroshi   ; Furukawa, Tomohiro  ; Kaito, Takeji ; Torimaru, Tadahiko*; Hayashi, Shigenari*; Kimura, Akihiko*; Ukai, Shigeharu*

In order to evaluate the strength and deformation in severe accident, the transient burst tests were carried out with various heating rates (from 0.1 to 10 K/s) and hoop stresses (from 50 to 200 MPa) to provide more evaluation data. The test materials were core materials in fast reactors, 9-18Cr-ODS and accident tolerant fuel cladding tube in the light water reactors, FeCrAl-added ODS ferritic steels. Result, the rupture strength dropped with increasing hoop stress and decreasing heating rate. The burst strength of Al-added ODS steels was lower than other ODS steels, Al and Zr-added ODS steels show good transient burst strength.