1. 1 TW6-TSW-003 Kick off meeting EFDA Garching October 9 th, 2006. Kick off meeting TW6-TSW-003-D1 Watching activities: Study and analysis of detritiation processes for high heat flux components (incl. Be, W, CFC) Kris Dylst, Johan Braet, Sven Vanderbiesen

2. 2 Background  High heat flux components are foreseen to be replaced at regular time intervals in future fusion machines.  Detritiation is necessary:  to recover high amount embedded tritium;  to facilitate waste storage and handling.

3. 3 Goals  Overall goal of the research program:  Development and testing of efficient, economical and safe processes for detritiation of high heat flux components (incl. Be, W and CFC)  Goal for this task:  To analyse the existing methods and review the state of the art of detritiation processes for heat flux components coming from the divertor refurbishment and blanket replacement during ITER / future fusion reactor maintenance.

4. 4 Overview of prior activities in the ‘detritiation’ field A lot of work has already been done at SCK and other laboratories: water detritiation;  mineralization of tritiated organic liquids;  concrete detritiation with superheated steam;  detritiation of molecular sieves;  detritiation of metals (stainless steel plus others);  sufficient detritiation of getter materials for final disposal.  Some work has also been done on the detritiation of plasma facing components:  Different hi-tech techniques like flash lights, laser ablation, plasma torch, HF heating have been proven to work. But the treatment speed needs to be increased and the techniques should be made in vessel compatible.

5. 5 TW6-TSW-003-D1: Working method  Analysis of the existing detritiation methods.  Review of the state of the art detritiation methods.  When sufficient data is available for a method:  Analyses of the overall process and the throughput;  Evaluation of the material flow management.  Possibly meeting with authors of most promising techniques to evaluate analyses and check for recent developments.  We will look into the possibility to check hydrogen diffusion from a heat flux component using thermo gravimetric-mass spectrometry.

6. 6 Foreseeable difficulties  Acquisition and transport of a tritiated heat flux component.  Availability of the thermo gravimetric-mass spectrometry equipment.

7. 7 Planning  Kick off  Study and analyses  Meetings with authors of detritiation techniques  Hydrogen diffusion  Final Report Due date 10 – 2006 06 – 2006 06 – 2007