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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?
N. S. Klimov, V. L. Podkovyrov, A. M. Zhitlukhin, A. D. Muzichenko, D. V. Kovalenko, A. B. Putrik, I. B. Kupriyanov, R. N. Giniyatulin, A. A. Gervash, V. M. Safronov
Fusion Science and Technology | Volume 66 | Number 1 | July-August 2014 | Pages 118-124
Technical Paper | doi.org/10.13182/FST13-759
Articles are hosted by Taylor and Francis Online.
The beryllium (Be) plasma-facing components (PFCs) of the ITER first wall (FW) were tested in the plasma gun QSPA-Be under pulsed plasma heat loads of 0.5-ms duration relevant to those expected in ITER during transient plasma events (edge-localized modes and disruptions). The experiments were performed for different Be grades (Russian TGP-56FW and US S65-C). The measured Be melting threshold decreases from 0.5 MJm−2 down to 0.4 MJm−2 with Be initial temperature increasing in the range of 250–500 °C. Under plasma heat loads on the exposed surface below the melting point the Be PFC erosion was mainly due to melting of the plasma-facing and lateral edges of the Be tiles. Under plasma heat loads above the melting point the Be PFC erosion was mainly due to intense melt layer movement and splashing. The Be melt layer behavior at 0.5 and 1.0 MJm−2 is similar to early investigated W melt layer behavior at higher heat loads of 1.0 and 1.5 MJm−2 correspondingly. Unlike W the Be erosion rate significantly increases with initial temperature in the range of 250–500 °C. These experimental observations are supported by calculation of temperature dynamics and melt layer thickness dynamics.