Utilisation and Reliability of High Power Proton Accelerators
Workshop Proceedings, Daejeon, Republic of Korea, 16-19 May 2004
Accelerator-driven systems (ADS) are being considered for their potential use in the transmutation of radioactive waste. The performance of such hybrid nuclear systems depends to a large extent on the specification and reliability of high power accelerators, as well as the integration of the accelerator with spallation targets and sub-critical systems. At present, much R&D work is still required in order to demonstrate the desired capability of the system as a whole.
Accelerator scientists and reactor physicists from around the world gathered at an NEA workshop to discuss issues of common interest and to present the most recent achievements in their research. Discussions focused on accelerator reliability; target, window and coolant technology; sub-critical system design and ADS simulations; safety and control of ADS; and ADS experiments and test facilities. These proceedings contain the technical papers presented at the workshop as well as summaries of the working group discussions held. They will be of particular interest to scientists working on ADS development as well as on radioactive waste management issues in general.
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CFD Analysis on the Active Part of Window Target Unit for LBE-Cooled XADS
Nuclear Energy Agency
The window target unit for an LBE-cooled primary core is one of the basic options considered in the framework of the preliminary design study of an experimental accelerator-driven system (PDS-XADS). In the present work, a numerical design study using the computational fluid dynamics (CFD) code CFX 5.6 was performed for the active part of this option with special attention to the coolability of the window. Steady-state as well as beam trip behaviours under normal operating conditions were investigated with the advanced turbulence model combined with the advanced wall treatment available in the new CFX 5 version. Based on the results of CFX 5.6 calculations, the window thickness was reduced to 2 mm in the centre from the initial proposal of 3 mm in order to satisfy the thermal design limit. The maximum temperature change rate of the window under beam trips is predicted to be as high as 412 C/s at 0.1 s after the beam interrupt. It is clear that beam trips with a beam interrupt duration less than 1 s could also be crucial to the integrity of the window.
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