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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.
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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.”
Elia Merzari, Hisashi Ninokata, Sheng Wang, Emilio Baglietto
Nuclear Technology | Volume 165 | Number 3 | March 2009 | Pages 313-320
Technical Paper | Thermal Hydraulics | doi.org/10.13182/NT09-A4104
Articles are hosted by Taylor and Francis Online.
The present work considers simulation of free-surface vortices by means of computational fluid dynamics. The issue is relevant for the design of sodium-cooled fast breeder reactors (FBRs). In fact, the eventual entrainment of gas in the reactor core of an FBR may cause abnormal operation condition because of disturbed reactivity.The foci of this work are turbulence modeling and free-surface modeling. Two different approaches are tested in the benchmark case of Moriya et al.: single-phase simulation (through large eddy simulation and detached eddy simulation methodology) and two-phase simulation (combining a volume-of-fluid method with turbulence modeling). Results are in excellent agreement with the experiment for the circumferential velocity in both cases if the grid adopted is sufficiently fine near the vortex core. Through additional grid refinement it is possible to correctly reproduce the shape of the vortex dimple. The code employed is STAR-CD 4.0.