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Argonne’s METL gears up to test more sodium fast reactor components
Argonne National Laboratory has successfully swapped out an aging cold trap in the sodium test loop called METL (Mechanisms Engineering Test Loop), the Department of Energy announced April 23. The upgrade is the first of its kind in the United States in more than 30 years, according to the DOE, and will help test components and operations for the sodium-cooled fast reactors being developed now.
H. Zush et al.
Fusion Science and Technology | Volume 55 | Number 2 | February 2009 | Pages 9-14
Technical Paper | Seventh International Conference on Open Magnetic Systems for Plasma Confinement | doi.org/10.13182/FST09-A6975
Articles are hosted by Taylor and Francis Online.
Hydrogen reemission and retention from and in the inert gas plasma sprayed tungsten (IPS-W) exposed to the plasma are described. Two kinds of irradiation scenarios are investigated in continuous and cyclic exposures. In the later a recovery phase exists between plasma exposure phases, simulated to the regular tokamak discharges. The H retention at the surface temperature Ts of 600 ~ 900 K was evaluated from 4 × 1020 m-2 to 2 × 1022 m-2 at the fluence from 1 × 1024 m-2 to 1 × 1026 m-2 under continuous exposure conditions. For the cyclic exposure, two cases associated temperature variation during the cycle, large Ts > 100 K and small < 40 K, are investigated. The temperature rise Ts dependence of the reemission and retention is observed. When Ts > 100 K, the apparent reemission is triggered by both Ts and irradiation itself, and then after the exposure stops it turns to apparent retention. However, for Ts < 40 K no reemission and retention are observed in the cycle. This fact suggests that the hydrogen reemission is enhanced during the exposure via the surface recombination process depending on Ts or Ts gradient across the specimen.