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Research Program on Tritium Control Methods in Supercritical CO2 Gas-Cooled Reactors

Hirofumi Nakamura, Kanetsugu Isobe, Masaru Nakamichi

Fusion Science and Technology / Volume 54 / Number 2 / August 2008 / Pages 341-345

Technical Paper / Tritium in Fission /

A research program to control tritium in supercritical CO2 (SC-CO2) gas-cooled reactors is presented. This type of reactor is attractive because it offers higher thermal efficiency and lower reactivity with the primary coolant. This program consists of two activities; development of tritium permeation barriers in the heat exchanger tubes and development of tritium removal method from the SC-CO2. For permeation reduction, a glassy coating was developed as the tritium permeation barrier for the SC-CO2 system. Experimental results showed the physical and chemical integrity of the coating for 100 hours soaking in the SCCO2. Significant permeation reduction of 1/20 to 1/60 are obtained. But, further permeation reduction is desired through a new coating technique development, since the permeation reduction at lower temperatures is small.

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