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Division Spotlight
Nuclear Nonproliferation Policy
The mission of the Nuclear Nonproliferation Policy Division (NNPD) is to promote the peaceful use of nuclear technology while simultaneously preventing the diversion and misuse of nuclear material and technology through appropriate safeguards and security, and promotion of nuclear nonproliferation policies. To achieve this mission, the objectives of the NNPD are to: Promote policy that discourages the proliferation of nuclear technology and material to inappropriate entities. Provide information to ANS members, the technical community at large, opinion leaders, and decision makers to improve their understanding of nuclear nonproliferation issues. Become a recognized technical resource on nuclear nonproliferation, safeguards, and security issues. Serve as the integration and coordination body for nuclear nonproliferation activities for the ANS. Work cooperatively with other ANS divisions to achieve these objective nonproliferation policies.
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!
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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.”
Akihiro Uchibori, Tatashi Takata (JAEA), Hideki Yanagisawa (NESI Corp.), Jiazhi Li, Sunghyon Jang (The Univ of Tokyo)
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 1289-1294
When pressurized water or vapor leaks from a failed heat transfer tube in steam generators of sodium-cooled fast reactors, a high-velocity and high-temperature jet with sodium-water chemical reaction may cause tube failure propagation. In this study, a numerical analysis method to predict occurrence of failure propagation by overheating rupture was constructed to expand application range of an existing computer code. Applicability of this method was investigated through the numerical analysis of the experiment on water vapor discharging in liquid sodium. In this experiment, one tube for water vapor discharging and the 91 target tubes were placed in a liquid sodium pool. The numerical analysis showed that the temperature of the target tubes increased by the effect of the reacting jet. Some of them near the initial water leak point resulted in overheating rupture as with the experimental result. Although the proposed analysis method is very helpful for design and safety assessment, this method provides temperature distribution more widely than the real situation. To improve this conservativeness, a Lagrangian particle model for simulating reacting jet was also developed as an alternative method. The numerical results by the program unit of this model showed that the discharged gaseous particles repeated collision with the target tubes and moved along the inverse gravity direction.