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Conference Spotlight
2026 Annual Conference
May 31–June 3, 2026
Denver, CO|Sheraton Denver
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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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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.
Claudia Dumitrescu, Sebastian Brad, Horia Necula, Mihai Vijulie, Alin Lazar, Catalin Brill, Oleksandr Sirosh, Aleksander Grafov, Andrii Rozhentsev
Fusion Science and Technology | Volume 81 | Number 4 | May 2025 | Pages 285-293
Review Article | doi.org/10.1080/15361055.2024.2434996
Articles are hosted by Taylor and Francis Online.
A computer simulation model developed in the ANSYS Fluent 2022 version R2 package was used for the engineering analysis required to design a counterflow matrix heat exchanger (MHE) for cooling a hydrogen stream. The theoretical data obtained with the simulation model were compared with the experimental data collected during the experimental campaigns carried out in the Cryogenics Laboratory of ICSI Rm. Valcea.
The MHE was tested for three test regimes obtained by theoretical correlations applicable to the current configuration. The Nusselt number, friction factor, and performances theorized by different authors, such as Gnielinski, Miheev, and Mikulin et al. were evaluated. This paper presents comparisons between the results obtained with the simulation model, the experimental values, and the theoretical models from the literature, highlighting the possibility of developing a mathematical model that can be applied to the calculation and design of a MHE.
