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.
Division Spotlight
Human Factors, Instrumentation & Controls
Improving task performance, system reliability, system and personnel safety, efficiency, and effectiveness are the division's main objectives. Its major areas of interest include task design, procedures, training, instrument and control layout and placement, stress control, anthropometrics, psychological input, and motivation.
Meeting Spotlight
ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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!
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Nuclear Science and Engineering
March 2025
Nuclear Technology
Fusion Science and Technology
February 2025
Latest News
RP3C Community of Practice’s fifth anniversary
In February, the Community of Practice (CoP) webinar series, hosted by the American Nuclear Society Standards Board’s Risk-informed, Performance-based Principles and Policies Committee (RP3C), celebrated its fifth anniversary. Like so many online events, these CoPs brought people together at a time when interacting with others became challenging in early 2020. Since the kickoff CoP, which highlighted the impact that systems engineering has on the design of NuScale’s small modular reactor, the last Friday of most months has featured a new speaker leading a discussion on the use of risk-informed, performance-based (RIPB) thinking in the nuclear industry. Providing a venue to convene for people within ANS and those who found their way online by another route, CoPs are an opportunity for the community to receive answers to their burning questions about the subject at hand. With 50–100 active online participants most months, the conversation is always lively, and knowledge flows freely.
Yigal Ronen, Yaakov Fahima
Nuclear Technology | Volume 67 | Number 1 | October 1984 | Pages 46-55
Technical Paper | Fission Reactor | doi.org/10.13182/NT84-A33528
Articles are hosted by Taylor and Francis Online.
Two methods for spectral shift control have been proposed for pressurized water reactors. The first method is a mechanical spectral shift where the moderator-to-fuel volume is changed. The second method is a chemical one in which the D2O/H2O ratio is changed. Utilization of a combination of the two methods has been suggested and analyzed. It was found that the advantage of the combined method is better than the sum of the advantages of the two methods separately. Emphasis was on using the spectral shift controls for one-batch reloads in order to increase the fuel cycle’s length and thus the electricity production. It was found that it is possible to increase electricity production during the plant’s lifetime by ∼6 to 9% compared to three and four batches using a regular control.
