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
Radiation Protection & Shielding
The Radiation Protection and Shielding Division is developing and promoting radiation protection and shielding aspects of nuclear science and technology — including interaction of nuclear radiation with materials and biological systems, instruments and techniques for the measurement of nuclear radiation fields, and radiation shield design and evaluation.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
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
Jul 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
August 2024
Nuclear Technology
Fusion Science and Technology
Latest News
Vogtle-3 shuts down for valve issue
One of the new Vogtle units in Georgia was shut down unexpectedly on Monday last week for a valve issue that has since been investigated and repaired. According to multiple local news outlets, Georgia Power reported on July 17 that Unit 3 was back in service.
Southern Company spokesperson Jacob Hawkins confirmed that Vogtle-3 went off line at 9:25 p.m. local time on July 8 “due to lowering water levels in the steam generators caused by a valve issue on one of the three main feedwater pumps.”
Yoichi Yamamoto, Shigeru Kubota, Satoru Suzuki (NUMO)
Proceedings | 16th International High-Level Radioactive Waste Management Conference (IHLRWM 2017) | Charlotte, NC, April 9-13, 2017 | Pages 452-461
This paper provides the outline of trial repository designs and specific design examples of underground facilities for the SDMs in NUMO safety case. Purposes of the repository design in this study are as follows.
· To show methodologies for developing flexible repository designs, tailored to various site conditions and changes in the social environment.
· To emphasize progress of the practical application of engineering technologies related to construction, operation and closure of a repository, based on technology developments for the manufacture and construction of engineered barrier systems.
· To confirm that the repository concepts developed here are capable of ensuring pre- and post-closure safety for the potential host rock formations defined in this safety case and meet the requirements in terms of practicality.
In designing the underground repository layout, the functions and design requirements of the key tunnels constituting the underground facilities were first identified, then the layout of them was designed taking into consideration discontinuous geological structures, i.e., faults and bed boundaries, and the groundwater flow. Regarding the shapes of the disposal panel for the highlevel vitrified waste, the through type and the dead-end type were adapted for the vertical emplacement concept and for the horizontal emplacement concept, respectively. The layouts of the underground facilities were provided for each emplacement concept. As the results of comparison among these design options, the underground facility combined with the horizontal emplacement concept and the dead-end type panel was identified as a relatively efficient and economical approach which is flexibly applicable to the geological structure.