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Division Spotlight
Thermal Hydraulics
The division provides a forum for focused technical dialogue on thermal hydraulic technology in the nuclear industry. Specifically, this will include heat transfer and fluid mechanics involved in the utilization of nuclear energy. It is intended to attract the highest quality of theoretical and experimental work to ANS, including research on basic phenomena and application to nuclear system design.
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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
Norway’s Halden reactor takes first step toward decommissioning
The government of Norway has granted the transfer of the Halden research reactor from the Institute for Energy Technology (IFE) to the state agency Norwegian Nuclear Decommissioning (NND). The 25-MWt Halden boiling water reactor operated from 1958 to 2018 and was used in the research of nuclear fuel, reactor internals, plant procedures and monitoring, and human factors.
J. L. Carvalho (Golder Associates), A. Ž. Živkovi?, A. Lee (NWMO)
Proceedings | 16th International High-Level Radioactive Waste Management Conference (IHLRWM 2017) | Charlotte, NC, April 9-13, 2017 | Pages 446-451
The Nuclear Waste Management Organization (NWMO) is responsible for implementing Adaptive Phased Management (APM); the approach selected by the Government of Canada for long-term management of Canada’s used nuclear fuel.
The Canadian program is in the conceptual stages and layouts have been advanced to facilitate communication about the disposal concept, but without the benefit of having a specific site identified as the host for the repository. The Canadian layouts to date have assumed that a large enough homogeneous and isotropic domain of rock will be available to host the repository; therefore the layouts tend to be of very regular geometries and compact. Other countries, such as Finland and Sweden, have identified their hosting locations which exhibit crystalline geosphere conditions. They started the development of adaptive (flexible) site-specific underground layouts capable of adjusting to encountered structural anisotropy. When viewed from this angle, it is possible that a number of Canadian candidate sites in crystalline geosphere would exhibit similar features. With this recognition, NWMO has started the development of adaptive layouts.
This paper presents the results of the first comparative study between the base case (regular and compact) and more adaptive layouts applied to a hypothetical Canadian crystalline geosphere. The Pugh Matrix (opportunity analysis) suitable for early design stages is used for comparative studies taking into consideration various factors including cost, schedule, site characterization requirements, constructability, operational flexibility, maintainability, operational safety and long-term safety, etc. It was concluded that the concepts represented in the adaptive layout offer advantages in relation to flexibility, schedule, post closure safety and thermal performance that may justify a deviation from the base case once a site has been selected.
