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
Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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
Sep 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
September 2025
Nuclear Technology
Fusion Science and Technology
August 2025
Latest News
Aalo breaks ground in Idaho
Eight days after Aalo Atomics released the details of its securing of $100 million in Series B funding, the company announced that it has broken ground on the 50-MWe Aalo-X. Sited in the desert beside Idaho National Laboratory, it will be the company’s first nuclear power plant, and it remains on track to go on line by July 4, 2026.
Richard L. Moore, Daniel W. Golden, E. L. Tolman
Nuclear Technology | Volume 87 | Number 4 | December 1989 | Pages 990-1004
Late Paper | TMI-2: Decontamination and Waste Management / Nuclear Safety | doi.org/10.13182/NT89-A27691
Articles are hosted by Taylor and Francis Online.
A two-dimensional finite element model was developed to simulate the Three Mile Island Unit 2 core heatup between 174 and 224 min and the subsequent cooling of the consolidated core region after the relocation of ≃25 tonnes of core material to the lower plenum of the reactor at 224 min. The model considered heat losses at the surfaces of the degraded core zone, core material melting, convective heat transfer within the molten pool, and decay heat reduction from the release of the volatile fission products. The results obtained from the model indicate that at least 17% of the consolidated core material must have been molten at 174 min in order to generate the ≃25 tonnes of core material that relocated at 224 min. The cooldown calculation indicated that as long as the core remained covered with coolant, the core configuration would remain thermally stable with pool cooldown beginning at ∼324 min after the initiation of the accident.