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WP4: System optimisation

The number of ADS accelerator beam trips has been identified in the PDS-XADS and EUROTRANS phases as a key issue since such trips threaten the core materials and can affect dramatically the plant availability.

This very specific reliability issue is a major requirement for the MYRRHA accelerator, which is asked to produce a very low number of beam interruptions (less than 10 within a 3-month operation cycle). During the EUROTRANS phase, a preliminary reliability study of the ADS reference accelerator has been conducted in order to assess the number of those trips per mission time. From the conclusions of this study, it seems realistic to ultimately reach such reliability goals if appropriate design concepts are used (especially redundancy and fault-tolerance). On the other hand, the absolute reliability figures obtained through this study remain quite questionable, because of the somewhat crude model used for such a complex system, especially for auxiliary systems, and because of the lack of a well-established component reliability figures database. The main objective of this WP4 “System optimisation” is therefore to pursue these reliability-oriented studies and push them one step beyond.

The development of a far more accurate reliability model of the MYRRHA accelerator is in particular strongly required for guidance of the engineering design. One of the most important goals of WP4 will therefore to first perform a detailed reliability analysis of an already existing accelerator, using the methodology applied in the current Nuclear Power Plants. In accordance with the obtained results, a model of the full MYRRHA linac will have then to be built, based on its existing design, and trying to take into account all support systems and, as far as possible, smart control strategies, fast beam shutdown systems and accelerator/reactor interface aspects.

The goal of this analysis is to draft conclusions and new recommendations in order to maximise the MYRRHA accelerator reliability/availability and safety. In this context, lessons learned from the accelerator-coupled GUINEVERE experiment will also be analysed and taken into account.

Following the conclusions of the EUROTRANS activities, WP4 needs also to focus on the optimisation of two crucial sub-systems of the MYRRHA accelerator: the cryogenic system, and the RF power system, the operation of which is of prime importance for the whole system reliability. Fundamental technological choices need to be made on these two topics, taking into account essential aspects like accelerator performances, reliability and cost. On the cryogenic system point of view, the optimal operational temperature needs in particular be determined for the intermediate-energy section. Concerning RF systems, design activities are especially required on the RF architecture optimisation of the 700 MHz high-energy section of the linac, taking into account the new advances in the solid-state technology at high frequency. On the former point, associated R&D activities need be performed.

This WP4 “System Optimisation” is ensured by EA. In order to fulfil the WP4 objectives described previously, five different tasks have been settled.

Task 4.1: Analysis of the optimal temperature of the MYRRHA superconducting linac
Due date of deliverable: January 2012

Task 4.2.: Reliability model of an existing accelerator
Parners: EA, ACS, CNRS
Due date of deliverable: October 2012

Task 4.3: Lessons learnt from the GUINEVERE accelerator-coupled experiment
Parners: CNRS, SCK•CEN
Due date of deliverable: July 2013

Task 4.4: Preliminary reliability study of the MYRRHA accelerator
Due date of deliverable: January 2014

Task 4.5: Expertise on the MYRRHA linac 700MHz RF system and associated R&D
Parners: TED, CNRS
Due date of deliverable: January 2014

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