The European Spallation Source ESS comprises a giant linear accelerator, a revolving helium cooled tungsten target wheel, a wide range of state-of-the-art neutron instruments, a suite of laboratories and supercomputing data management and a software development center.
ESS is more than an advanced research tool. It is also a major new European Research Infrastructure Centre (ERIC), starting from scratch. Activation of the neutron source area around the rotating target poses challenges for maintenance to be performed remotely. A specific problem is the maintenance of the moderator. Another challenge is to define all maintenance work to take place in the Active Cells.
There is a new moderator concept development, where the original moderator is split into two separate units (upper and lower). For maintenance of critical moderator module at the bottom of the target wheel has established a task force.
Heemskerk Innovative Technology supported the design teams at ESS and Fagerstrom in developing the Twister, the assembly of the target station and the establishment of the active cells, using the experience of ITER maintenance. It also makes HIT on the basis of components, tools and procedures, the need for an inventory maintenance tasks in the active cells.