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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.”
Rebecca M. Howell, Eric Burgett, Nolan E. Hertel, Stephen F. Kry, Zhonglu Wang, Mohammad Salehpour
Nuclear Technology | Volume 168 | Number 2 | November 2009 | Pages 333-339
Neutron Measurements | Special Issue on the 11th International Conference on Radiation Shielding and the 15th Topical Meeting of the Radiation Protection and Shielding Division (Part 2) / Radiation Protection | doi.org/10.13182/NT09-A9204
Articles are hosted by Taylor and Francis Online.
Above 20 MeV the standard spheres of a Bonner sphere spectrometer (BSS) have similar responses, both in shape and sensitivity. The responses of the standard set also exhibit strongly diminishing sensitivities above 20 MeV. In the current work the Monte Carlo N-Particle eXtended (MCNPX) code was used to investigate different design modifications to increase the high-energy neutron response of a BSS. The cost-effective system expands upon the design of an existing, commercially available BSS system by adding concentric shells of copper, tungsten, and lead. These shells are used in various combinations with the existing spheres. The design, referred to as the Bonner sphere extension (BSE), incorporates both passive and active detection techniques including activation foils and the standard 6LiI(Eu) scintillator. Detailed models in MCNPX were used to create fine-group neutron responses from thermal to 1000 MeV. Measurements were performed with the BSE at Los Alamos Neutron Science Center, and the data were unfolded using the MXD-FC33 code and the calculated BSE response matrix. The resulting spectrum demonstrated the BSE system provided improvement in the measurement of the neutron spectra in the energy regions above 20 MeV when compared to the standard Bonner sphere system. The BSE system extends the sensitivity of the system to more than ten decades in energy while maintaining a nearly isotropic angular response.