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実用高温ガス炉の開発に必要なHTTRを用いた試験の予備検討

Preliminary study on HTTR tests for development of commercial HTGRs

後藤 実  ; 高松 邦吉  ; 中川 繁昭  ; 植田 祥平   ; 濱本 真平  ; 大橋 弘史 ; 古澤 孝之 ; 齋藤 賢司 ; 島崎 洋祐 ; 西原 哲夫 

Goto, Minoru; Takamatsu, Kuniyoshi; Nakagawa, Shigeaki; Ueta, Shohei; Hamamoto, Shimpei; Ohashi, Hirofumi; Furusawa, Takayuki; Saito, Kenji; Shimazaki, Yosuke; Nishihara, Tetsuo

実用高温ガス炉開発に必要な各種の特性・実証データを取得するため、高温工学試験研究炉(HTTR: High Temperature engineering Test Reactor)を用いた試験について予備検討を行った。本検討では、核熱供給特性試験,燃焼炉心試験,制御棒引抜試験(反応度投入試験),安全性実証試験,燃料特性試験,環状炉心試験,燃料限界照射試験,トリチウム測定試験,高温機器の健全性確認試験を提案し、実用高温ガス炉に必要とされる諸要件とそれを確認・確証する方策についてとりまとめた。このうち、燃焼炉心試験、及び安全性実証試験については、実測データと比較するために事前解析を行って予測データを取得した。また、実用高温ガス炉の炉心として採用される環状炉心の試験については、HTTRの2次燃料を用いた4種類の環状炉心について炉心計算を行って核的な成立性を示した。

Preliminary studies on the HTTR (High Temperature engineering Test Reactor) tests were conducted to obtain characteristics and demonstration data which were required to develop commercial HTGRs (high temperature gas-cooled reactors). The tests proposed in this study are as follows: nuclear heat supply characteristics tests, burned core tests, reactivity insertion tests, safety demonstration tests, fuel characteristics tests, annular core tests, fuel failure tests, tritium measurement tests, and health confirmation tests of high temperature equipments. Requirements for a development of commercial HTGRs and confirmation methods of the requirements by the HTTR tests were summarized. Preliminary analyses were performed for the burned core test and the safety demonstration test to obtain prediction data, which is compared with experimental data. Additionally, a feasibility analysis was performed on four types annular cores, which is composed of the HTTR's fresh fuels, from the point of view of shutdown margin and excess reactivity.

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