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.
George D. Cremeans, Richard F. Mahla
Nuclear Technology | Volume 87 | Number 4 | December 1989 | Pages 737-744
Technical Paper | TMI-2: Decontamination and Waste Management / Radioactive Waste Management | doi.org/10.13182/NT89-A27666
Articles are hosted by Taylor and Francis Online.
The March 1979 accident at Three Mile Island Unit 2 released reactor coolant and core material particles to the reactor building basement and by various side streams to the auxiliary and fuel-handling building systems. Consequently, existing plant materials and incidental debris became radioactively contaminated from contact with the primary coolant discharge. Additionally, the makeup and purification (MUP) system demineralizer resins were degraded by exposure to thousands of curies of iodine and cesium trapped in the vessels. Area radiation levels, ranging from ten to thousands of roentgens per hour, prevented or severely restricted access to these areas and prohibited local decontamination methods. To decontaminate these areas, several alternative methods were evaluated, and one was selected as the most economically acceptable and plant-compatible method to remotely collect, process, and dispose of these radioactive materials and degraded resins. The decision was made to modify the two 14.38-kl (3800-gal) in-plant spent-resin storage tanks (SRSTs) to operate as particulate separators by a decantation process. The level of particulate concentration by this process was determined by the physical and radiochemical characteristics of the materials, relative to the subsequent requirements for solidification and disposal operations. Various modifications and features were added to each SRST to allow them to operate as clarifiers for concentrating sediments as well as resins. The sequence of operation is to pump a batch of solids entrained in water to a tank, allow it to settle, decant the supernatant, repeat this process until sufficient solids are collected, and then pump the solids to a solidification disposal container. The first two waste streams processed by the SRSTs were the containment basement sediment and contaminated resins from the cleanup demineralizers. A campaign is currently in progress to remove the contaminated resins from the MUP demineralizers.