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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.”
Steven T. Polkinghorne, Gregg L. Sharp, Richard T. McCracken
Nuclear Technology | Volume 145 | Number 1 | January 2004 | Pages 44-56
Technical Paper | Thermal Hydraulics | doi.org/10.13182/NT04-A3459
Articles are hosted by Taylor and Francis Online.
The Advanced Test Reactor (ATR) is a 250-MW irradiation facility used to test reactor fuels and other materials, and also to produce radioisotopes. The ATR core is divided into five regions, or lobes, that normally operate at different power levels. To support future irradiation programs, it is desired that the maximum lobe power be increased 10% (from 60 to 66 MW). A modification to ATR's emergency core cooling system is proposed to ensure that adequate safety margins would be maintained during a loss-of-coolant accident (LOCA). The modification being considered is the addition of an accumulator injection system. The RELAP5 thermal-hydraulic code and the SINDA thermal analyzer were used to simulate the two most challenging design-basis LOCAs identified in the ATR Safety Analysis Report. Calculations were performed both with and without accumulator injection. The results indicate that a 10% increase in maximum lobe power is achievable. Minimum thermal margins increased more than 40% when accumulator injection was simulated.