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
Isotopes & Radiation
Members are devoted to applying nuclear science and engineering technologies involving isotopes, radiation applications, and associated equipment in scientific research, development, and industrial processes. Their interests lie primarily in education, industrial uses, biology, medicine, and health physics. Division committees include Analytical Applications of Isotopes and Radiation, Biology and Medicine, Radiation Applications, Radiation Sources and Detection, and Thermal Power Sources.
Meeting Spotlight
International Conference on Mathematics and Computational Methods Applied to Nuclear Science and Engineering (M&C 2025)
April 27–30, 2025
Denver, CO|The Westin Denver 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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Nuclear Science and Engineering
June 2025
Nuclear Technology
Fusion Science and Technology
May 2025
Latest News
Industry Update—May 2025
Here is a recap of industry happenings from the recent past:
TerraPower’s Natrium reactor advances on several fronts
TerraPower has continued making aggressive progress in several areas for its under-construction Natrium Reactor Demonstration Project since the beginning of the year. Natrium is an advanced 345-MWe reactor that has liquid sodium as a coolant, improved fuel utilization, enhanced safety features, and an integrated energy storage system, allowing for a brief power output boost to 500-MWe if needed for grid resiliency. The company broke ground for its first Natrium plant in 2024 near a retiring coal plant in Kemmerer, Wyo.
Douglas W. Akers, E. L. Tolman, Pui Kuan, Daniel W. Golden, Masahide Nishio
Nuclear Technology | Volume 87 | Number 1 | August 1989 | Pages 205-213
Technical Paper | TMI-2: Materials Behavior / Nuclear Safety | doi.org/10.13182/NT89-A27648
Articles are hosted by Taylor and Francis Online.
The results through 1988 of the postaccident inventory and distribution of selected radionuclides within the Three Mile Island Unit 2 (TMI-2) reactor system are presented. Best-estimate inventories are presented for krypton (85Kr), cesium (137Cs), iodine (129I), antimony (125Sb), strontium (90Sr), ruthenium (106Ru), and cerium (144Ce). This inventory accounting includes all repositories in the TMI-2 reactor system. The accountability for principal radionuclides includes 144Ce (105%), 90Sr (93%), 137Cs (95%), and 85Kr (91 %). The accountability for radioiodine is similar to that for cesium. The principal repositories for cesium and iodine, and the noble gases, are the reactor building, and the reactor vessel for all other radionuclides.
