Effects of temperature history during cooling process on cladding ductility reduction under lost of coolant accident conditions

Udagawa, Yutaka; Nagase, Fumihisa; Fuketa, Toyoshi

JAERI-Research 2005-020, 40 Pages, 2005/09

JAERI-Research-2005-020.pdf:4.63MB

In order to investigate effects of quenching temperature and cooling rate before quench on cladding ductility reduction under LOCA conditions, samples cut from non-irradiated 1717-type Zircaloy-4 cladding tubes for PWRs were oxidized in steam at 1373 and 1473 K, cooled at 2 to 7 K/s, and quenched at 1073 to 1373 K. The quenched samples were subjected to ring compression test, microstructure observation, and Vickers hardness test. Quenching temperature decrease obviously increased area fraction of phase in the radial cross section of the cladding, and reduced cladding ductility. Slow-cooling rate decrease increased unit size and hardness of precipitated phase, while phase area fraction and cladding ductility were not significantly changed. phase is harder than the surrounding region in the metallic layer and has higher oxygen content, indicating its low ductility. Consequently, increase in the area fraction in the cladding is a main cause of the reduction in cladding ductility with decrease in the quenching temperature.

Regrowth of the photoquenchable defect relating to the hopping conduction in arsenic-ion-implanted semi-insulating GaAs

Kuriyama, Kazuo*; Kazama, K.*; Kato, Takashi*; Yamamoto, Shunya; Aoki, Yasushi; Naramoto, Hiroshi

Journal of Applied Physics, 80(8), p.4488 - 4490, 1996/10

https://doi.org/10.1063/1.363423

no abstracts in English

Analytical study of thermal response similarity between simulated fuel rods and nuclear fuel rods during reflood phase of PWR-LOCA

; ; Murao, Yoshio

Journal of Nuclear Science and Technology, 23(4), p.315 - 325, 1986/00

https://doi.org/10.3327/jnst.23.315

no abstracts in English

Evaluation of CCTF Core-II Second Acceptance Test C2-AC2(Run 052); Investigation of Difference in Reflooding Behaviors between Core-I and Core-II Facilities

; Murao, Yoshio

JAERI-M 84-036, 73 Pages, 1984/03

JAERI-M-84-036.pdf:1.51MB

no abstracts in English

Analysis of precursory cooling in quenching phenomena

Hirano, Masashi; Asahi, Yoshiro

Journal of Nuclear Science and Technology, 17(5), p.339 - 350, 1980/00

https://doi.org/10.3327/jnst.17.339

no abstracts in English

Data Report on Reflood Experiment ・ VIII (Series 6 : Heat Transfor Data)

; Murao, Yoshio; ; ; Sudo, Yukio; ; ; ; ; *

JAERI-M 8169, 369 Pages, 1979/03

JAERI-M-8169.pdf:7.5MB

no abstracts in English