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
Conference on Nuclear Training and Education: A Biennial International Forum (CONTE 2025)
February 3–6, 2025
Amelia Island, FL|Omni Amelia Island Resort
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
Jan 2025
Jul 2024
Latest Journal Issues
Nuclear Science and Engineering
February 2025
Nuclear Technology
Fusion Science and Technology
Latest News
How to talk about nuclear
In your career as a professional in the nuclear community, chances are you will, at some point, be asked (or volunteer) to talk to at least one layperson about the technology you know and love. You might even be asked to present to a whole group of nonnuclear folks, perhaps as a pitch to some company tangential to your company’s business. So, without further ado, let me give you some pointers on the best way to approach this important and surprisingly complicated task.
Wataru Shinoda, Susumu Mitake
Nuclear Science and Engineering | Volume 36 | Number 3 | June 1969 | Pages 372-388
Technical Paper | doi.org/10.13182/NSE69-A18735
Articles are hosted by Taylor and Francis Online.
We investigated the xenon-induced spatial oscillations in boiling-water cooled reactors by the use of a three-dimensional xenon dynamics code FILE-6, which solves the one-group neutron diffusion equation simultaneously with the steady state thermo-hydrodynamics equations and with the iodine-to-xenon equations in the time domain. The stability limit of the first azimuthal mode in terms of the void coefficient of reactivity was found to be in a 500 MWe heavy-water-moderated boiling-light-water-cooled reactor. When the height of the reactor core is larger than 7 m, the first axial mode becomes unstable for a void coefficient of +0.05. It has also been shown that (i) a positive (negative) void coefficient may have a stabilizing (destabilizing) effect on the axial higher modes depending on the inlet subcooling, (ii) the mode coupling between the axially zeroth and the first modes through voids has a stabilizing effect, and (iii) when the first azimuthal mode is oscillating, higher harmonics are excited in some of higher modes through the nonlinear reactivity feedback.
