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The division was organized to promote the advancement of knowledge of the use of particle accelerator technologies for nuclear and other applications. It focuses on production of neutrons and other particles, utilization of these particles for scientific or industrial purposes, such as the production or destruction of radionuclides significant to energy, medicine, defense or other endeavors, as well as imaging and diagnostics.
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Nuclear Science and Engineering
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NEA issues call to action in report on nuclear cost reductions
A new report from the Paris-based OECD Nuclear Energy Agency declares that nuclear power is needed for countries to meet their Paris Agreement decarbonization and energy security policy goals, but that governmental support for a rapid reduction in the cost of new nuclear capacity through the creation of certain policy frameworks is likely necessary.
S. Gordeev, F. Gröschel, V. Heinzel, W. Hering, R. Stieglitz
Fusion Science and Technology | Volume 68 | Number 3 | October 2015 | Pages 618-624
Technical Paper | Proceedings of TOFE-2014 | dx.doi.org/10.13182/FST14-948
Articles are hosted by Taylor and Francis Online.
IFMIF (International Fusion Materials Irradiation Facility) is an accelerator based deuteron-lithium (D-Li) neutron source to simulate the neutron irradiation field in a fusion reactor. The target assembly of the IFMIF consists of the flow conditioners and the nozzle, which has to form a stable lithium jet. This work focuses on a numerical study of the flow conditioner efficiency, in which two different types of flow conditioners are compared by means of a detailed numerical analysis with respect to specific hydraulic effects in the pipe elbow and the inflow conditioners. The adequateness of two modelling approaches - Large Eddy Simulation (LES) and Detached Eddy Simulation (DES) - to simulate an unstable flow through a 90° bend of circular cross section has been examined. Both methods investigated exhibit a reasonable agreement with the experimental data, but the DES approach does not require a very fine grid resolution and is less time consuming. The further conducted numerical analysis of the flow conditioner uses a DES approach. The calculations show that a honeycomb-screen combination is not capable to suppress effectively large scale swirl motions emerging from the bend. A frequency analysis of the static pressure fluctuation reveals instabilities in the shear layer between the separation zone and the accelerated outer region, which additionally increase the inhomogeneity of the axial velocity distribution.