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Report No.

Investigation of chemical characteristics of primary helium gas coolant of HTTR (High Temperature engineering Test Reactor)

Hamamoto, Shimpei ; Shimazaki, Yosuke ; Furusawa, Takayuki ; Nemoto, Takahiro; Inoi, Hiroyuki; Takada, Shoji

The technical basis of helium gas purification control for HTGRs was established by verifying the design of the PHPS of HTTR by showing that the measured concentrations of impurities of primary helium coolant were restricted below the criteria to protect the graphite oxidation, and that the carburization atmosphere was maintained to keep intact of metallic high temperature components, in the 30-day continuous operation and the 50-day long term high temperature operation. The improved analytical model predicted the composition of the impurities such as H$$_{2}$$, CO, H$$_{2}$$O and CO$$_{2}$$, which is determined by the temperature dependency of release of impurities during the rated power operation adequately. In contrast, it was revealed that the measured concentration of H$$_{2}$$O remarkably decreased while the concentration of CO increased in the primary helium coolant in the long term high temperature operation.



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Category:Nuclear Science & Technology



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