高温ガス炉の実用高燃焼燃料技術の開発; カザフスタンとの国際共同研究

Development on extended burnup fuel technologies for practical high temperature gas-cooled reactors; Collaborative research with Kazakhstan

植田 祥平   ; 柴田 大受 ; 相原 純 ; Shaimerdenov, A.*; Dyussambayev, D.*; 高橋 昌史*; 木下 英昭*; Gizatulin, S.*; 坂場 成昭 

Ueta, Shohei; Shibata, Taiju; Aihara, Jun; Shaimerdenov, A.*; Dyussambayev, D.*; Takahashi, Masashi*; Kinoshita, Hideaki*; Gizatulin, S.*; Sakaba, Nariaki

HTTRの約3倍に高燃焼度化した小型モジュール商用高温ガス炉への導入を前提とする高品質な日本製の量産型被覆燃料粒子の開発を目的として、寸法仕様を新たに設定し、国内燃料メーカーと共同で製造技術を確立した。2件の国際科学技術センター(ISTC)レギュラープロジェクトの採択を経て、カザフスタン核物理研究所において照射試験及び照射後試験を行った結果、極めて高い照射性能を確認し、世界に先駆けて高品質な量産型高温ガス炉燃料の高燃焼度化技術を確立した。

To develop the highly-qualified, mass-produced coated fuel particle in Japan which is supposed to be introduced to small modular commercial high temperature gas-cooled reactors (HTGRs), a dimensional specification of the fuel has been determined to attain three times higher burnup than that of the HTTR (High Temperature Engineering Test Reactor). Fabrication technologies of the fuel have been established in collaboration with Japanese nuclear fuel fabricator. As results on irradiation test and post irradiation examination at the Institute of Nuclear Physics in Kazakhstan via acceptances of two Regular Projects of ISTC (International Science and Technology Center), an excellent performance of the fuel under irradiation has been confirmed. Finally, technologies to extend the burnup for the highly-qualified, mass-produced HTGR fuel have been established first in the world.