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Aerospace Nuclear Science & Technology
Organized to promote the advancement of knowledge in the use of nuclear science and technologies in the aerospace application. Specialized nuclear-based technologies and applications are needed to advance the state-of-the-art in aerospace design, engineering and operations to explore planetary bodies in our solar system and beyond, plus enhance the safety of air travel, especially high speed air travel. Areas of interest will include but are not limited to the creation of nuclear-based power and propulsion systems, multifunctional materials to protect humans and electronic components from atmospheric, space, and nuclear power system radiation, human factor strategies for the safety and reliable operation of nuclear power and propulsion plants by non-specialized personnel and more.
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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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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.
T. Koehler, M. Yoda, S. I. Abdel-Khalik, D. L. Sadowski, S. Shin
Fusion Science and Technology | Volume 52 | Number 3 | October 2007 | Pages 526-530
Technical Paper | The Technology of Fusion Energy - High Heat Flux Components | dx.doi.org/10.13182/FST07-A1542
Articles are hosted by Taylor and Francis Online.
The liquid surfaces of liquid-protected high heat flux plasma-facing components may be subject to large temperature gradients caused by non-uniform incident particle and heat flux. Thermocapillary flows due to such gradients can potentially cause dry-out in high-temperature regions. Experimental and numerical investigations have been conducted to determine the maximum allowable non-dimensional temperature gradient just before rupture in thin liquid films of various aspect ratios and viscosities . Experiments were conducted using a needle contact method to measure the liquid film height of axisymmetric silicone oil ( = 4.8 × 10-3 Ns/m2-9.6 × 10-1 Ns/m2) films for aspect ratios of 0.0065 to 0.02 on a non-isothermal stainless steel surface. The experimental data were compared with predictions from both an axisymmetric asymptotic analysis for the steady-state film height for thin layers and a direct numerical simulation using the level contour reconstruction method for thicker layers. The results of this investigation will provide component designers with experimentally-validated limits on the maximum allowable temperature radients to prevent local dry spot formation and possible burnout.
