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

HTTR(高温工学試験研究炉)1次冷却材ヘリウムガスの不純物特性の研究

濱本 真平; 島崎 洋祐; 古澤 孝之; 根本 隆弘; 猪井 宏幸; 高田 昌二

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

HTTRによる30日及び50日の高温連続運転において、1次ヘリウム冷却材の不純物濃度の測定値が、(1)黒鉛酸化を防止する基準値以下に抑制されること、(2)超耐熱合金の健全性を確保できる浸炭性雰囲気に維持されることを示すことができた。これにより、HTTRの不純物除去系の設計の妥当性を検証でき、高温ガス炉の不純物管理に関する技術基盤を構築できた。改良した解析モデルによる解析結果と試験結果との比較により、(1)定格出力連続運転中における、不純物放出の温度依存性により決まるH$$_{2}$$, CO, H$$_{2}$$O, CO$$_{2}$$の不純物組成比の測定結果を適切に予測できること、(2)長期高温連続運転では、1次冷却材ヘリウム中でのH$$_{2}$$O濃度の測定値が顕著に減少するがCO濃度が増加することを明らかにした。

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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パーセンタイル:73.24

分野:Nuclear Science & Technology

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