The effect of γ-ray irradiation on deuterium permeation through reduced activation ferritic steel and erbium oxide coating. (December 2018)

• Record Type: Journal Article
• Authors: Fujita, Hikari; Mochizuki, Jumpei; Horikoshi, Seira; Matsunaga, Moeki; Tanaka, Teruya; Terai, Takayuki; Oya, Yasuhisa; Chikada, Takumi
• Is Part Of: Nuclear materials and energy. Volume 17(2018)
• Page Start: 78
• Page End: 82
• Publication Date: 2018-12
• Subjects: Tritium -- Permeation -- γ-ray -- Irradiation -- F82H -- Erbium oxide; Nuclear energy -- Periodicals; Nuclear fuels -- Periodicals; Nuclear reactors -- Materials -- Periodicals; Radioactive substances -- Periodicals; 621.4833
• DOI: 10.1016/j.nme.2018.09.001
• Languages: English
• ISSNs: 2352-1791

Abstract

Highlights: Deuterium permeation flux through F82H sample slightly increased by γ-ray irradiation. γ-ray irradiation effect increased with increasing dose rate and lowering sample temperature. Surface temperature of F82H sample rose by 0.2–0.5 °C depending on γ-ray dose rate. γ-ray irradiation effect is mainly attributed to γ-heating. The effect of γ-ray irradiation on deuterium permeation through Er2 O3 coating is similar to that of F82H. Abstract: Deuterium permeation through a fusion-relevant ferritic steel F82H with and without erbium oxide coatings under γ-ray irradiation has been investigated in a temperature range from 300 to 700 °C. The deuterium permeation flux through F82H sample increased by γ-ray irradiation at lower temperatures below 450 °C. The irradiation effect increased with dose rate, and the percentage of the permeation flux gain might be several percent under the dose rate of a few Gy s ‒1 . Temperature of the F82H sample surface rose by about 0.5 °C depending on the dose rate, and so the γ-ray irradiation effect is mainly attributed to γ-heating. On the other hand, at higher temperature above 500 °C, no appreciable change of the deuterium permeation was observed. Similarly, the deuterium permeation flux through erbium oxide coated samples increased under γ-ray irradiation at lower temperatures (350‒450 °C), but no appreciable change of permeation flux through coatings was observed at higher temperatures (600‒700 °C). The coating surface temperature increased at lower sample temperatures by γ-heating.