ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
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!
Latest Magazine Issues
Jul 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
August 2024
Nuclear Technology
Fusion Science and Technology
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.”
Haihua Zhao, Per F. Peterson
Nuclear Technology | Volume 158 | Number 2 | May 2007 | Pages 145-157
Technical Paper | Nuclear Reactor Thermal Hydraulics | doi.org/10.13182/NT07-A3832
Articles are hosted by Taylor and Francis Online.
This paper presents an overview and a few point designs for multiple-reheat Brayton cycle power conversion systems (PCSs) using heat from high-temperature molten salts or liquid metals. All designs are derived from the General Atomics gas turbine-modular helium reactor (GT-MHR) power conversion unit (PCU). Analysis shows that, with relatively small engineering modifications, multiple GT-MHR PCUs can be connected together to create a PCS in the >1000 MW(electric) class. The resulting PCS is quite compact, and results in what is likely the minimum gas duct volume possible for a multiple-reheat system. To realize this, compact plate type liquid-to-gas heat exchangers (power densities from 10 to 120 MW/m3) are needed. Different fluids such as helium, nitrogen and helium mixture, and supercritical CO2 are compared for these multiple-reheat Brayton cycles. For turbine inlet temperatures of 900, 750, and 675°C, the net thermal efficiencies for helium cycles are 56, 51, and 48%, respectively, and corresponding PCU power densities are 560, 490, and 460 kW(electric)/m3, respectively. The very high PCU power densities could imply a large material saving and low construction cost, and bring down the specific PCU cost to about half that of the current GT-MHR PCS design.