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小型高温ガス炉システム(HTR50S)の核設計

Nuclear design of small-sized HTGR system (HTR50S)

後藤 実 ; 関 靖圭; 稲葉 良知 ; 大橋 弘史 ; 佐藤 博之 ; 深谷 裕司  ; 橘 幸男 

Goto, Minoru; Seki, Yasuyoshi; Inaba, Yoshitomo; Ohashi, Hirofumi; Sato, Hiroyuki; Fukaya, Yuji; Tachibana, Yukio

日本原子力研究開発機構は、2030年代の開発途上国等への導入を目指し、実証もしくは商用炉初号機と位置付けられる小型高温ガス炉システムHTR50Sの概念設計を開始した。HTR50Sの設計は、建設コストの抑制と2030年代の導入を可能とするために、実証試験を必要とする新たな技術はできるだけ用いず、実証されたHTTRの設計技術を改良して用いることを方針とした。その中で、核設計については、出力密度の向上及び燃料濃縮度数の削減を主な改良項目として検討を進めた。その結果、HTR50Sの核設計では、出力密度をHTTRの1.4倍に向上させるとともに、燃料濃縮度数をHTTRの12種類から3種類に大幅に削減させることに成功した。

Japan Atomic Energy Agency has started a conceptual design of a small-sized HTGR with 50 MW thermal power (HTR50S), which is a first-of-a-kind commercial or demonstration plant of a small-sized HTGR to be deployed in developing countries in the 2030s. The design policy of the HTR50S is to construct it without development of new technologies, which require additional demonstration tests, to suppress the construction cost and deploy it in 2030s. Accordingly, the nuclear design of the HTR50S was performed by upgrading the proven design technology of the High Temperature Engineering Test Reactor (HTTR). In the nuclear design of the HTR50S, we challenged to increase the power density and decrease the number of the fuel enrichments compared with the HTTR. As a result, the nuclear design was completed successfully by increasing the power density by 1.4 times of the power density of the HTTR and reducing the number of the fuel enrichment to only three from twelve of the HTTR.

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