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Nuclear Science and Engineering
Fusion Science and Technology
Finding fusion’s place
Fusion energy is attracting significant interest from governments and private capital markets. The deployment of fusion energy on a timeline that will affect climate change and offer another tool for energy security will require support from stakeholders, regulators, and policymakers around the world. Without broad support, fusion may fail to reach its potential as a “game-changing” technology to make a meaningful difference in addressing the twin challenges of climate change and geopolitical energy security.
The process of developing the necessary policy and regulatory support is already underway around the world. Leaders in the United States, the United Kingdom, the European Union, China, and elsewhere are engaging with the key issues and will lead the way in setting the foundation for a global fusion industry.
Gregg A. Morgan, Brittany J. Hodge, Anita S. Poore
Fusion Science and Technology | Volume 72 | Number 3 | October 2017 | Pages 426-433
Technical Paper | dx.doi.org/10.1080/15361055.2017.1333858
Articles are hosted by Taylor and Francis Online.
A prototype Pd-Ag diffuser manufactured by Power and Energy was evaluated for performance characterization testing at the Savannah River National Laboratory (SRNL). The prototype Pd-Ag diffuser was characterized to determine the overall performance as a function of the permeation of hydrogen through the membrane. The tests described in this report consider the effects of feed gas compositions, feed flow rates, pump type and internal tube pressure on the permeation of H2 through the Pd-Ag tubes.
For the 96% H2/4% N2 mixtures, nearly all of the H2 permeated through the membrane at flow rates up to 3000 sccm. However, results for the 50% H2/50% N2 composition show that 100% permeation is only achieved up to a flow rate of 1000 sccm. A significant reduction in the hydrogen permeation was observed for the 2% H2/98% N2 composition. This Pd-Ag diffuser design is not suitable for a tritium purification system within the fusion energy fuel cycle. Typical tritium purification systems can be expected to see a range of hydrogen isotope concentrations and this particular prototype diffuser is only suitable for process streams containing high concentrations of hydrogen isotopes.
Significant efforts should be undertaken to identify additional commercial vendors for Pd-Ag diffusers. It is of critical importance to identify, procure, and test different Pd-Ag designs that can perform well over a range of hydrogen isotope concentrations for tritium gas processing applications.