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.
Explore membership for yourself or for your organization.
Conference Spotlight
2026 Annual Conference
May 31–June 3, 2026
Denver, CO|Sheraton Denver
Standards Program
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
Dec 2025
Jul 2025
Latest Journal Issues
Nuclear Science and Engineering
January 2026
Nuclear Technology
December 2025
Fusion Science and Technology
November 2025
Latest News
What’s the most difficult question you’ve been asked as a maintenance instructor?
Blye Widmar
"Where are the prints?!"
This was the final question in an onslaught of verbal feedback, comments, and critiques I received from my students back in 2019. I had two years of instructor experience and was teaching a class that had been meticulously rehearsed in preparation for an accreditation visit. I knew the training material well and transferred that knowledge effectively enough for all the students to pass the class. As we wrapped up, I asked the students how they felt about my first big system-level class, and they did not hold back.
“Why was the exam from memory when we don’t work from memory in the plant?” “Why didn’t we refer to the vendor documents?” “Why didn’t we practice more on the mock-up?” And so on.
Norihiro Ikemoto, Hironori Shiraishi, Akira Tsuguchi, Mutsumi Nakamura, Naoki Mizuniwa, Satoshi Akamaru, Masanori Hara
Fusion Science and Technology | Volume 81 | Number 6 | August 2025 | Pages 580-590
Regular Research Article | doi.org/10.1080/15361055.2025.2456894
Articles are hosted by Taylor and Francis Online.
A tritium removal system (TRS) has been designed and installed. The TRS can remove tritium leaked into a workspace (100 m3). The tritium removal process in the TRS is a wet method in which leaked tritium compounds are oxidized to tritiated water by a catalyst, and the tritiated water is captured by a molecular sieve bed. The tritium removal performance (TRP) of the TRS was evaluated using H2 and CH4. The TRP is expressed by the relationship between the tritium oxidation efficiency of the catalyst bed and the water-capturing efficiency of the molecular sieve bed. The oxidation efficiency of CH4 increased with increasing the catalyst temperature, and it reached to 0.75 around 280°C. The water-capturing efficiency was found to be 0.97 during the operation.
The relationship between the oxidation efficiency and the water-capturing efficiency was reconstructed to chart and evaluate the tritium removal time. The chart evaluating the TRP of the TRS satisfied the design requirements. The design and evaluation method of this TRS can be applied to other TRSs using the wet method.
