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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.
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Nuclear Energy Conference & Expo (NECX)
September 8–11, 2025
Atlanta, GA|Atlanta Marriott Marquis
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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WIPP’s SSCVS: A breath of fresh air
This spring, the Department of Energy’s Office of Environmental Management announced that it had achieved a major milestone by completing commissioning of the Safety Significant Confinement Ventilation System (SSCVS) facility—a new, state-of-the-art, large-scale ventilation system at the Waste Isolation Pilot Plant, the DOE’s geologic repository for defense-related transuranic (TRU) waste in New Mexico.
D. R. Harris, V. Prescop
Nuclear Science and Engineering | Volume 37 | Number 2 | August 1969 | Pages 171-179
Technical Paper | doi.org/10.13182/NSE69-A20675
Articles are hosted by Taylor and Francis Online.
A reactor can be analyzed as a multiplicative stochastic process or, approximately, as a deterministic process. When feedback is present, the stochastic and deterministic analyses can differ qualitatively as well as quantitatively, as is illustrated by the concept of stability. In the present study, a stochastic model of a nuclear power reactor with 135Xe, 135I, and control feedback is considered as an example of a nonlinear stochastic process. The values of variances and covariances are calculated from the first- and second-moment equations, using an iterative procedure. Numerical criteria for the value of the feedback coefficient for marginal stationarity of the stochastic model are compared with the corresponding criteria for the stability of the corresponding linearized deterministic model and found to be identical, within eight significant figures.
