About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2025
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2025
|
| Presentation Title |
Fuel Inventory in and on Fusion Materials Studied With Ion and Molecular Beams |
| Author(s) |
Taki Aissou, Florin Ghiorghiu, Greg De Temmerman, Marco Minissale, Thierry Angot, Regis Bisson |
| On-Site Speaker (Planned) |
Regis Bisson |
| Abstract Scope |
In ITER, power exhaust occurs on tungsten (W) tiles but 10% of plasma-exposed surfaces are made of 316L stainless steel. Thus, deuterium and tritium retention is expected in both W and 316L. We measured that 316L materials exposed to deuterium plasma not only retain hydrogen isotopes, but also emit ammonia molecules. This is because the natural nitrogen content of SS316L easily diffuses towards the surface and reacts with hydrogen isotopes [1]. To understand how this potential source of radioactive ammonia could influence the nuclear safety requirement of ITER, we measured the sticking probability of ammonia on W and 316L thanks to a supersonic molecular beam and built a kinetic model to estimating ammonia contribution to the tritium inventory in ITER [2].
[1] https://doi.org/10.1088/2053-1591/ad2b10 (2024)
[2] https://doi.org/10.1021/acs.jpcc.0c03313 (2020) |
| Proceedings Inclusion? |
Undecided |