Utilisation and Reliability of High Power Proton Accelerators

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

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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.



Status of the Megapie Project

Nuclear Energy Agency

The MEGAPIE project was started to design, build and operate a liquid metal spallation neutron target as a key experiment on the road to an experimental accelerator-driven system and to improve the neutron flux at the PSI spallation source. The design of the target system has now been completed and manufacturing has started. The target is designed for a beam power of 1 MW and 6 Ah of accumulated current. It will contain about 88 l of LBE serving as target material and primary heat removal fluid. The heat will be removed by forced convection using an in-line electromagnetic pump with a 4 l/sec capacity. The heat will be evacuated from the target through 12 mono-wall cooling pins via an intermediate oil and a water cooling loop. The beam window made of the martensitic steel T91 will be cooled by a jet of cold LBE extracted at the heat exchanger exit by a second EM pump from the LBE main stream. A preliminary safety analysis has been performed considering normal, off-normal and accident conditions and a corresponding report has been submitted to authorities for licensing. The experience gained up to now shows that MEGAPIE may well be the first liquid metal target to be irradiated under high-power beam conditions.


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