Utilisation and Reliability of High Power Proton Accelerators

Workshop Proceedings, Daejeon, Republic of Korea, 16-19 May 2004

image of Utilisation and Reliability of High Power Proton Accelerators

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.



Thermal-Hydraulic Experiments on the Tall LBE Test Facility

Nuclear Energy Agency

In order to support ADS-related technologies, the thermal-hydraulic ADS lead-bismuth loop (TALL) was designed and constructed at KTH to investigate the heat transfer performance of different heat exchangers, and the thermal-hydraulic characteristics of natural and forced circulation flow under steady and transient conditions. The LBE loop is of full height and was scaled such that the prototypic (power/volume) ratio would represent the main components. So far, the forced convection and heat transfer of LBE through a straight tube heat exchanger and a U-tube heat exchanger have been accomplished and documented [1]. Transient experiments in the test facility are being conducted with reference to safety issues of ADS under the following conditions: a) startup and shutdown, b) loss of heat sink, c) loss of external driving head, d) heater trips, e) sudden change in power, and f) blockage in pipe. Preliminary tests were encouraging given the agreement of experimental data with RELAP5 analysis. More transient experiments and RELAP5 analysis will be performed in the future.


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