DEMO Single Null Inner Mid-plane Limiter RM feasibility study

DEMO Single Null Inner Mid-plane Limiter RM feasibility study

DEMO Single Null Inner Mid-plane Limiter RM feasibility study 150 150 UKAEA Opendata
UKAEA-RACE-PR(21)03

DEMO Single Null Inner Mid-plane Limiter RM feasibility study

DEMO is a key part of the EU fusion roadmap, where the programme is reaching the end of the pre-conceptual phase with a gate review in 2020. As part of the work to complete this phase, eight Key Design Integration Issues (KDII’s) have been identified as critical to the programme. Within KDII#1 (wall protection limiters) the feasibility of the Inner Mid-plane Limiter (IML) for remote maintenance is assessed. The IML is an actively cooled component attached to the inner ring of the tokamak torus, the access for removal and installation is only possible from the plasma facing side. The IML service life is less than the breeder blankets (BB). This drives the need to change the IML with the BB in position. When replacing the IML, the pipework is expected to be too highly irradiated to allow re-welding. This drives the need to change the pipework to the IML, a challenging task when the BB are in position. This paper presents the preliminary development of a maintainable IML concept, including: the development of the IML fastening for remote maintenance; a proposal for a new IML cooling pipe chute; and the rational for the options selected. This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 and 2019-2020 under grant agreement No 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission.

Collection:
Journals
Journal:
Fusion Engineering and Design
Publisher:
Elsevier
Published date:
16/03/2021
The published version of this paper is currently under embargo and will be available on 16/03/2023