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
Operations & Power
Members focus on the dissemination of knowledge and information in the area of power reactors with particular application to the production of electric power and process heat. The division sponsors meetings on the coverage of applied nuclear science and engineering as related to power plants, non-power reactors, and other nuclear facilities. It encourages and assists with the dissemination of knowledge pertinent to the safe and efficient operation of nuclear facilities through professional staff development, information exchange, and supporting the generation of viable solutions to current issues.
Meeting Spotlight
2025 ANS Annual Conference
June 15–18, 2025
Chicago, IL|Chicago Marriott Downtown
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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Jun 2025
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Nuclear Science and Engineering
July 2025
Nuclear Technology
Fusion Science and Technology
Latest News
Smarter waste strategies: Helping deliver on the promise of advanced nuclear
At COP28, held in Dubai in 2023, a clear consensus emerged: Nuclear energy must be a cornerstone of the global clean energy transition. With electricity demand projected to soar as we decarbonize not just power but also industry, transport, and heat, the case for new nuclear is compelling. More than 20 countries committed to tripling global nuclear capacity by 2050. In the United States alone, the Department of Energy forecasts that the country’s current nuclear capacity could more than triple, adding 200 GW of new nuclear to the existing 95 GW by mid-century.
G. Apostolakis, T. L. Chu
Nuclear Technology | Volume 50 | Number 1 | August 1980 | Pages 5-15
Technical Paper | Reactor | doi.org/10.13182/NT80-A17065
Articles are hosted by Taylor and Francis Online.
The reliability analysis of the engineered safety systems of nuclear power plants requires the calculation of the pointwise and average unavailabilities of redundant systems under periodic test and maintenance. The complexity of the calculations usually requires simulation for realistic results. However, simple analytical expressions showing the significant contributions to the unavailability provide insights concerning the relative importance of the potential failure modes of the systems, such as hardware failures, demand-type failures, human errors, and various types of dependent (common cause) failures. These expressions can be used for a quick calculation of the unavailability as well as the propagation of uncertainties by analytical methods, e.g., the method of moments.
