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Conference Spotlight
2025 ANS Winter Conference & Expo
November 9–12, 2025
Washington, DC|Washington Hilton
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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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NN Asks: What did you learn from ANS’s Nuclear 101?
Mike Harkin
When ANS first announced its new Nuclear 101 certificate course, I was excited. This felt like a course tailor-made for me, a transplant into the commercial nuclear world. I enrolled for the inaugural session held in November 2024, knowing it was going to be hard (this is nuclear power, of course)—but I had been working on ramping up my knowledge base for the past year, through both my employer and at a local college.
The course was a fast-and-furious roller-coaster ride through all the key components of the nuclear power industry, in one highly challenging week. In fact, the challenges the students experienced caught even the instructors by surprise. Thankfully, the shared intellectual stretch we students all felt helped us band together to push through to the end.
We were all impressed with the quality of the instructors, who are some of the top experts in the field. We appreciated not only their knowledge base but their support whenever someone struggled to understand a concept.
Alan P. Main, Bryce L. Shriver
Nuclear Technology | Volume 59 | Number 3 | December 1982 | Pages 456-462
Technical PaperTechnical Paper | The Backfill as an Engineered Barrier for Radioactive Waste Management / Material | doi.org/10.13182/NT82-A33003
Articles are hosted by Taylor and Francis Online.
A model for predicting the annealing response of A553-B weld materials has been developed. This model assumes that the irradiation-induced shifts in the nil ductility transition temperature (ΔNDTT) and Charpy upper shelf energy (ΔUSE) are a result of the introduction of three types of defects into the alloy. The recovery of ΔNDTT and ΔUSE depends on the concentration of each defect remaining after the annealing treatment. The three defect types, including their diffusion constants, are assumed to be the same for all A533-B welds. However, the contribution of each defect type to ΔNDTT and ΔUSE depends on the chemical composition of the material and possibly the neutron fluence. Copper, nickel, manganese, and chromium were found to correlate with ΔNDTT, while sulfur and phosphorus appeared to correlate with ΔUSE. Once the relative contribution of each defect type is known, the recovery of ΔNDTT and ΔUSE is predicted based on diffusion calculations. Both the annealing temperature and time are accounted for in the calculations. The final model was compared with experimental data on three materials tested by Westinghouse Electric Corporation and two materials tested by the Naval Research Laboratory. The model accurately predicted the recovery of ΔNDTT for all five materials annealed at 343°C (650°F) to 454°C (850°F) for 24 to 336 h. The predicted recovery of ΔUSE was not as accurate as that of ΔNDTT.
