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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
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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.”
Iztok Tiselj, Cedric Flageul, Jure Oder (Jožef Stefan Inst), invited
Proceedings | Advances in Thermal Hydraulics 2018 | Orlando, FL, November 11-15, 2018 | Pages 1050-1065
The paper discusses the most accurate methods for description of turbulent flows: computationally very expensive Direct Numerical Simulation (DNS) and, slightly less accurate and slightly less expensive, Large Eddy Simulation (LES) method. Both methods have found the way into the nuclear thermal hydraulics as tools for studies of the fundamental mechanisms of turbulence and turbulent heat transfer. In the first Section of the paper, both methods are briefly introduced in parallel with the basic properties of the turbulent flows. The focus is on DNS method, the so-called quasi-DNS approach, and the coarsest turbulence modelling approach discussed in this work, which is still on the very small scale, wall-resolved LES. Other, coarser turbulence modeling approaches (such as wall-modelled LES, RANS/LES hybrids, or RANS) are beyond the scope of the present paper. Section 2. answers the question: "How do DNS and LES methods work?", with a short discussion of the computational requirements, numerical approaches and computational tools. Section 3. is about the interpretation of the DNS and LES results and statistical uncertainties. Sections 4. and 5. give some examples of the DNS and wall-resolved LES results relevant for nuclear thermal hydraulics. The last section lists the conclusions and some of the challenges, which might be tackled with the most accurate techniques like DNS and LES.