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College students help develop waste-measuring device at Hanford
A partnership between Washington River Protection Solutions (WRPS) and Washington State University has resulted in the development of a device to measure radioactive and chemical tank waste at the Hanford Site. WRPS is the contractor at Hanford for the Department of Energy’s Office of Environmental Management.
Masabumi Nishikawa, Ken-ichi Tanaka, Mitsuru Uetake
Fusion Science and Technology | Volume 28 | Number 4 | November 1995 | Pages 1738-1748
Technical Paper | Tritium System | doi.org/10.13182/FST95-A30438
Articles are hosted by Taylor and Francis Online.
The tritium bred in a deuterium-tritium fusion reactor is removed from its blanket by using helium sweep gas. From the viewpoint of adsorption capacity and pressure of tritium at release, a cryosorption bed, which uses molecular sieves or activated carbon at the temperature of liquid nitrogen, is attractive for the recovery of this tritium. The mass transfer coefficients required to predict the breakthrough curve are experimentally discussed. The overall mass transfer coefficient KFav in the cryosorption of hydrogen isotopes on molecular sieves or activated carbon at 77 K consists of a mass transfer coefficient that represents the transfer from the bulk gas flow to the surface of the adsorbent through the boundary layer kfav, a mass transfer coefficient that represents the axial dispersion in the packed bed kzav and a mass transfer coefficient that represents the intraparticle diffusion through micro pores in the adsorbent particle βksav. The value of βksav is confirmed to be 1 to 50 s−1, which decreases with an increase of hydrogen partial pressure, and the rate-controlling step is βksav when the hydrogen partial pressure is higher than several hundred pascals, and kzav becomes the rate-controlling step when the hydrogen partial pressure is low and gas velocity is slow. The dependence of KFav on hydrogen isotopes and adsorbents appears to be small under the current experimental conditions.