Journal
FUSION ENGINEERING AND DESIGN
Volume 83, Issue 5-6, Pages 747-751Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.fusengdes.2008.05.030
Keywords
Lithium-lead; Inertial fusion reactor; Wet wall; Tritium; Recovery
Categories
Funding
- Grants-in-Aids for Scientific Research in Priority Areas on Tritium Science and Technology for Fusion Reactor [19055006]
- Osaka University
- National Institute Fusion Sciences
- Kyushu University [NIFS04KUGK001]
- Grants-in-Aid for Scientific Research [19055006] Funding Source: KAKEN
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The best material for a wet wall and blanket of an inertial fusion reactor is selected among Li, eutectic alloys of Li-Pb, Li-Sn and a 2LiF + BeF2 molten salt mixture called Flibe, judging from their chemical, nuclear and heat-transfer properties. Li0.17Pb0.83 is found to be the most promising one because of low Li vapor pressure, moderate melting temperature, good heat-transfer properties under the condition of a KOYO-fast circulation loop operated between 300 and 500 degrees C. A counter-current extraction tower packed with metallic rashig rings is proposed to extract tritium generated and dissolved in the Li-Pb eutectic alloy. Mass-transfer parameters when He and Li-Pb flow counter-currently through the tower packed with the rings are determined to satisfy the two necessary conditions of a self-sufficient tritium generation rate of 1.8 MCi/day and a target tritium leak rate of 10 Ci/day. It is found that the height of a tower to achieve the 99.999% recovery is comparatively low because of the promising property of a large equilibrium pressure of tritium. in order to mitigate the disadvantage of its high density, which needs a large pumping power, a porous packing material that keeps good contact between He and Li-Pb should be developed in the future. It is found experimentally that D-2 addition in He purge gas is effective to achieve a faster rate of tritium recovery from the Li-Pb flow. The rate-determining step of tritium permeation through a steam generator is determined as a function of a Li-Pb flow rate in a stainless-steel heat-transfer tube. (C) 2008 Elsevier B.V. All rights reserved.
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