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The division was organized to promote the advancement of knowledge of the use of particle accelerator technologies for nuclear and other applications. It focuses on production of neutrons and other particles, utilization of these particles for scientific or industrial purposes, such as the production or destruction of radionuclides significant to energy, medicine, defense or other endeavors, as well as imaging and diagnostics.
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Nuclear Science and Engineering
Fusion Science and Technology
Fukiushima Daiichi: 10 years on
The Fukushima Daiichi site before the accident. All images are provided courtesy of TEPCO unless noted otherwise.
It was a rather normal day back on March 11, 2011, at the Fukushima Daiichi nuclear plant before 2:45 p.m. That was the time when the Great Tohoku Earthquake struck, followed by a massive tsunami that caused three reactor meltdowns and forever changed the nuclear power industry in Japan and worldwide. Now, 10 years later, much has been learned and done to improve nuclear safety, and despite many challenges, significant progress is being made to decontaminate and defuel the extensively damaged Fukushima Daiichi reactor site. This is a summary of what happened, progress to date, current situation, and the outlook for the future there.
James P. Blanchard, Qiyang Hu, Nasr Ghoniem
Fusion Science and Technology | Volume 56 | Number 1 | July 2009 | Pages 341-345
High Average Power Laser and Other IFE R&D | Eighteenth Topical Meeting on the Technology of Fusion Energy (Part 1) | dx.doi.org/10.13182/FST09-A8925
Articles are hosted by Taylor and Francis Online.
Dry wall laser IFE chambers will experience large, transient heat and particle fluxes as the target yield products reach the wall. These threats, consisting of x-rays, ions, and neutrons, can lead to wall failure caused by transient stresses or as a result of deposited ions in the near-surface layer. We have developed a unified model for the calculation of temperatures, stresses, strains, and fracture behavior in a solid IFE chamber wall. The model is also coupled with ion transport sub-models that assess the effects of ions on the morphology of the wall materials. This paper describes the models incorporated into the new unified simulation and, in particular, presents new fracture models that permit fracture calculations without the need for an advanced finite element calculation. This fracture model assumes that an array of surface cracks is present in the wall surface and uses superposition to calculate the stress intensity factor via a numerical integration of the stress profile computed for an un-cracked geometry. We also describe approaches for computing the stresses due to inertial effects resulting from the rapid heating associated with the IFE threats. In some cases, these inertial effects lead to stress waves that can lead to premature wall damage and must be accounted for in the analysis. This model is based on semi-analytical solutions for stress waves due to shallow heating in a relatively thick solid. The combined thermomechanical model gives us detailed understanding of the fundamental mechanics of rapidly heated surfaces.