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Nuclear Science and Engineering
Fusion Science and Technology
Advanced reactors: Now comes the hard part
Designing a reactor is complicated but building one may be harder. Even companies that have had lots of practice haven’t always done it well. And all the power reactors in service today were built by companies that had years of experience in other kinds of big steam-electric power plants. In contrast, some of the creative new designs now moving toward commercialization come from start-ups that have never built anything at all. How should they prepare?
R. R. Paguio, M. Takagi, M. Thi, J. F. Hund, A. Nikroo, S. Paguio, R. Luo, A. L. Greenwood, O. Acenas, S. Chowdhury
Fusion Science and Technology | Volume 51 | Number 4 | May 2007 | Pages 682-687
Technical Paper | dx.doi.org/10.13182/FST51-682
Articles are hosted by Taylor and Francis Online.
Previously we have developed a production process for both standard density (100 mg/cc) and high-density (180-200 mg/cc) resorcinol formaldehyde (RF) foam shells with a triple orifice droplet generator. These foam shells are needed for direct drive inertial confinement laser fusion experiments on the OMEGA laser facility at the University of Rochester. Although this process has been developed into production mode, the yield of high density RF (HDRF) and standard density (SDRF) shells with acceptable wall uniformity has been poor. This yield depends on the type of RF shell that is being fabricated. For HDRF this yield is ~5% while for the SDRF shells the yield is ~30%. We have made improvements in the yield of these shells that meet the wall uniformity specification by modifying the composition of the outer oil solution (O2) in the microencapsulation emulsion. This improvement was achieved by a small addition (0.60 wt.%) of a styrene-butadiene-styrene (SBS) block copolymer into the outer oil (O2) solution that increased the interfacial tension of the emulsion system as well as the viscosity of the O2 solution. This modification improved the out of round and concentricity of the RF foam shells resulting in an increase in the yield of shells that meet the target wall uniformity specifications.