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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
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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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.
Shingo Tashiro, Ai Fujiwara, Muneaki Senoo
Nuclear Technology | Volume 121 | Number 1 | January 1998 | Pages 14-23
Technical Paper | Kiyose Birthday Anniversary | doi.org/10.13182/NT98-A2815
Articles are hosted by Taylor and Francis Online.
To develop engineered barriers and construction methods for an enhanced radioactive waste repository, an advanced application of cement/concrete and bentonite was studied. On the basis of the tests on fundamental properties of the materials, model structures were prepared by actual construction methods, and then the permeability was evaluated.For cement/concrete, two model silos were constructed by different methods and then the reduction in permeability was evaluated. One was constructed by an ordinary method and then grouted with cement milk containing fine cement and silica fume. The whole permeability of the silo after grouting decreased to one-sixteenth of the value before grouting. The other was constructed by a crack-controlling method. This method could make the whole permeability of the silo as low as one-tenth of that of the cracked silo. For bentonite, a compaction method and a spraying method were examined with a mixture of sodium-type bentonite and sand. To demonstrate these methods, model structures were constructed using full-scale machines. Then the relationship between the dry density and the permeability was examined. For a 20 to 30% bentonite mixture, the permeability was almost equally low for both methods, while the density was lower for the spraying method than for the compaction method. In contrast, for a 10% bentonite content, low permeability could only be obtained with the high-density structure.The permeability of both the concrete structures and the bentonite-sand structures was significantly low as engineered barriers, showing some differences with the structures and their construction methods. Referring to the test results, an engineered barrier system proving low permeability was suggested by a combination of the structures and the construction methods.