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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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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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PG&E to dredge Diablo Canyon intake system
The owners of the Diablo Canyon nuclear power plant plan to dredge a massive buildup of shoaled sediment from its seawater intake cove.
Pacific Gas and Electric spokesperson Suzanne Hosn said, “The dredging project in the Diablo Canyon marina will remove approximately 70,000 cubic yards of sediment to prevent circumstances that could impact the power plant’s cooling system. Dredging will take place for the first time since operations began because of a rapid increase in sediment.”
Hideyuki Hosokawa, Makoto Nagase, Motomasa Fuse, Yutaka Watanabe
Nuclear Science and Engineering | Volume 175 | Number 2 | October 2013 | Pages 135-148
Technical Paper | doi.org/10.13182/NSE12-80
Articles are hosted by Taylor and Francis Online.
The formation process of a ferrite oxide film (which can effectively suppress radioactive nuclide deposition on piping surfaces) was evaluated from the viewpoints of forming optimum film structures and reducing waste disposal. Both pH and oxidation-reduction potential (ORP) of ferrite film formation solution were found to be important, and the film formation process could be understood on the basis of a Pourbaix diagram of the iron-water system. To make a thin and closely packed oxide film, the pH and ORP values should be maintained within the magnetite stability domain by controlling the hydrazine concentration, which promotes the film formation reactions. Use of chemical solutions such as formic acid and hydrazine was confirmed to get catalyst decomposition into easily handled substances. This film formation process could be evaluated taking into consideration the charge balance and chemical equilibrium equations of each reaction involved in the film formation. It was clarified that preoxidation of the ferrite film under certain oxidizing water chemistry conditions (such as normal water chemistry) in boiling water reactors could further improve the film cobalt deposition suppression performance due to the formation of hematite. Our selected film forming process and waste solution decomposition conditions were confirmed using the simulated flow system apparatus of one-tenth actual plant scale. The method was applied to the actual plant just after the chemical decontamination. After one cycle elapsed, dose rate of the reactor recirculation system piping coated with ferrite film was half that before the ferrite film was formed.