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June 15–18, 2025
Chicago, IL|Chicago Marriott Downtown
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The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
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Latest News
Zaporizhzhia ‘extremely fragile’ relying on single off-site power line, IAEA warns
Europe’s largest nuclear power plant has just one remaining power line for essential nuclear safety and security functions, compared with its original 10 functional lines before the military conflict with Russia, warned Rafael Mariano Grossi, director general of the International Atomic Energy Agency.
Hirofumi Nakamura, Takumi Hayashi, Yasunori Iwai, Masataka Nishi
Fusion Science and Technology | Volume 39 | Number 2 | March 2001 | Pages 894-898
Divertor and Plasma-Facing Components | doi.org/10.13182/FST01-A11963353
Articles are hosted by Taylor and Francis Online.
Effect of annealing on the transient permeation behavior of deuterium implanted into pure tungsten was investigated. Permeation experiment was carried out with pure tungsten foils (34 mm in diameter, 25 micro-m in thickness, and 99.5% purity) annealed at 1273 K for 3 hours in vacuum and unannealed one. Those permeation characteristics at transient state were analyzed by TMAP4 code. As a result, the feature of the trap site in the unannealed tungsten specimen was revealed that which has about 0.9 eV trap energy and 40ppm-trap density. By the analysis of the permeation behavior through the annealed tungsten, above trap sites disappeared by specimen annealing, and the permeation through annealed tungsten was found to be expressed by simple diffusion equation with the effective diffusion coefficient. However, it may involve the trapping parameter, which is virtually indistinguishable from reduction of diffusion coefficient, in itself.