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
2025 ANS Winter Conference & Expo
November 9–12, 2025
Washington, DC|Washington Hilton
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
Oct 2025
Jul 2025
Latest Journal Issues
Nuclear Science and Engineering
November 2025
Nuclear Technology
October 2025
Fusion Science and Technology
Latest News
Sellafield awards $3.86B in infrastructure contracts to three companies
Sellafield Ltd., the site license company overseeing the decommissioning of the U.K.’s Sellafield nuclear site in Cumbria, England, announced the award of £2.9 billion (about $3.86 billion) in infrastructure support contracts to the companies of Morgan Sindall Infrastructure, Costain, and HOCHTIEF (UK) Construction.
F. Schmittroth, R. E. Schenter
Nuclear Science and Engineering | Volume 63 | Number 3 | July 1977 | Pages 276-291
Technical Paper | doi.org/10.13182/NSE77-A27040
Articles are hosted by Taylor and Francis Online.
Based on a sensitivity analysis of decay-heat summation calculations, uncertainties are obtained for the calculated decay heat associated with the thermal fission of 235U and the fast fission of 238U and 239Pu. For typical reactor irradiation times and cooling times >100 s, these uncertainties are <3.5% for 235U, 4% for 238U, and 5% for 239Pu. All calculations are based on ENDF/B-IV data.