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2024 ANS Annual Conference
June 16–19, 2024
Las Vegas, NV|Mandalay Bay Resort and Casino
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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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Fusion Science and Technology
February 2024
Latest News
Can hydrogen be the transportation fuel in an otherwise nuclear economy?
Let’s face it: The global economy should be powered primarily by nuclear power. And it probably will by the end of this century, with a still-significant assist from renewables and hydro. Once nuclear systems are dominant, the costs come down to where gas is now; and when carbon emissions are reduced to a small portion of their present state, it will become obvious that most other sources are only good in niche settings. I mean, why use small modular reactors to load-follow when they can just produce that power instead of buffering it?
P. Norajitra, W. W. Basuki, L. Spatafora, U. Stegmaier
Fusion Science and Technology | Volume 66 | Number 1 | July-August 2014 | Pages 266-271
Technical Paper | doi.org/10.13182/FST13-739
Articles are hosted by Taylor and Francis Online.
A modular He-cooled divertor concept for DEMO has been pursued at KIT with the goal of reaching 10 MW/m2. The reference design uses small tungsten-based cooling fingers of about 20 mm in size. They consist of a tungsten tile as a thermal shield that is to be connected to a thimble heat sink structure from W–1 wt% La2O3 (WL10) tungsten alloy. The lower boundary of the divertor operating temperature window is predicted by the ductile-to-brittle temperature and the upper boundary by the recrystallization temperature of WL10 material, currently assumed at 600°C and 1300°C, respectively. The important requirements for the joint between the W tile and WL10 thimble are (a) functioning as a crack stopper, (b) resisting a high operating temperature of about 1200°C, and (c) using low-activation material as an interlayer. Previously used PdNi brazing material has been successfully tested at a brazing temperature of about 1270°C. The mock-ups produced in this way are sufficient for the HHF tests without neutrons. In a further step to approach the DEMO requirements with higher demands, the use of low-activating titanium with a melting point of 1668°C as bonding material was examined both for brazing and for diffusion welding of tungsten parts. This paper reports on the first successful test results of both high-temperature brazing and diffusion bonding techniques.