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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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ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
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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
First astatine-labeled compound shipped in the U.S.
The Department of Energy’s National Isotope Development Center (NIDC) on March 31 announced the successful long-distance shipment in the United States of a biologically active compound labeled with the medical radioisotope astatine-211 (At-211). Because previous shipments have included only the “bare” isotope, the NIDC has described the development as “unleashing medical innovation.”
Jae-Jun Jeong, Isabelle Dor, Dominique Bestion
Nuclear Technology | Volume 117 | Number 3 | March 1997 | Pages 267-280
Technical Paper | Nuclear Reactor Safety | doi.org/10.13182/NT97-A35341
Articles are hosted by Taylor and Francis Online.
The CATHARE 2 three-dimensional module is assessed in comparison with the Upper Plenum Test Facility downcomer test 7, which was performed to obtain full-scale data on downcomer and lower plenum refill behavior during the refill phase of a loss-of-coolant accident. New discretizations for the equation of motion, named Mods. D and R, are suggested and implemented in the three-dimensional module. Mod. A is also investigated, which defines a new junction void fraction used to calculate interfacial friction. Using the standard and the modified three-dimensional modules, the four experiments, test 7 runs 200 through 203, are simulated with the downcomer nodalized as an 8 × 1 × 8 mesh. Sensitivity calculations associated with interfacial friction, condensation, and nodalization are also performed. The calculation results show that the discretization of the momentum convection is very important in strongly heterogeneous flow conditions. Mod. D + A gives the best results so far, and Mod. R + A yields the smallest scatter in the predicted water deliveries to the lower plenum. The results of the sensitivity calculations show that the interfacial friction coefficient of CATHARE 2 is somewhat overestimated and the 8 × 1 × 8 mesh downcomer is fine enough for test 7.
