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Nuclear design study on a small-sized high temperature gas-cooled reactor with high burn-up fuel and axial fuel shuffling

高燃焼度燃料と軸方向燃料シャッフリングを適用した小型高温ガス炉の核設計に関する研究

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

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

日本原子力研究開発機構は、2020年頃の開発途上国への導入を目指し、小型高温ガス炉(HTR50S)の概念設計を開始した。HTR50Sの設計はHTTRの設計技術を改良して用いる。HTTRでは12種類の出力分布の最適化のために濃縮度が用いられたが、これまでに行ったHTR50Sの設計研究では、燃料濃縮度を3種類まで低減することに成功した。核設計にかかわる本研究では、ウラン燃料の有効利用の観点から、高燃焼度燃料と軸方向の燃料シャッフリングを適用する。燃料シャッフリングでは、2年ごとに炉心の半分の燃料を取り出し、残りは炉心に再装荷する。炉心燃焼計算を行って核特性値を解析し、それらが設計要求を満たすことを確認した。

Japan Atomic Energy Agency (JAEA) has started a conceptual design study of a small-sized High Temperature Gas-cooled Reactor (HTGR) with 50 MW thermal power (HTR50S) to be deployed in developing countries in the 2020s. The nuclear design of the HTR50S is performed by upgrading that of a High Temperature Engineering Test Reactor (HTTR), which is the Japanese HTGR with 30 MW thermal power. In the HTTR design, 12 kinds of fuel enrichment was used to optimize the power distribution. In the previous study of the HTR50S, we succeeded in reducing the number of the fuel enrichment to 3. The present study challenges the nuclear design for effective use of uranium by utilizing high burn-up fuel and axial fuel shuffling, in which a half of the loaded fuel elements is discharged from the core every 2 years and the remains are reloaded. The core burn-up calculations were performed and the nuclear characteristics were confirmed to satisfy the design requirement.

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