ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Decommissioning & Environmental Sciences
The mission of the Decommissioning and Environmental Sciences (DES) Division is to promote the development and use of those skills and technologies associated with the use of nuclear energy and the optimal management and stewardship of the environment, sustainable development, decommissioning, remediation, reutilization, and long-term surveillance and maintenance of nuclear-related installations, and sites. The target audience for this effort is the membership of the Division, the Society, and the public at large.
2021 Student Conference
April 8–10, 2021
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!
Latest Magazine Issues
Latest Journal Issues
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.
Fusion Science and Technology | Volume 52 | Number 4 | November 2007 | Pages 1040-1044
Technical Paper | Plasma Engineering and Diagnostics | dx.doi.org/10.13182/FST07-A1632
Articles are hosted by Taylor and Francis Online.
For the successful steady state operation of deuterium-tritium (DT) fusion reactors, helium (He) ash needs to be removed continuously from the burning core, along with unburned hydrogenic fuel particles, to sustain the power generation. This will require enormous particle pumping capabilities despite the fact that helium is the most difficult gas to be pumped by means of cryogenic condensation. In the present work, zero-dimensional, four-reservoir (core-plasma, SOL-plasma, gas-phase, and wall material) global particle balance modeling has been conducted for both DT-fuel and He-ash particles. Modeling results indicate that, for the density control of He-ash particles in the burning core, passive wall pumping via codeposition with eroded plasma-facing materials would definitely be necessary to compensate for the lack of pumping speed provided by conventional vacuum equipment. Recent experimental data on helium codeposition with lithium have been used as input for modeling and results indicate that lithium-gettered moving-surface plasma-facing components can meet the He-ash pumping requirements.