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高速炉実用化のための大規模ナトリウム試験

Large-scaled thermohydraulic tests using sodium for commercialization of LMFBR technology

家田 芳明; 村松 壽晴; 土井 禎浩; 児玉 徹彦; 仲井 悟; 山下 卓哉; 井上 正明

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実験炉段階で採用される配管短縮化、原子炉容器を含む機器のコンパクト化、自然循環を重視のした崩壊熱除去など、原子炉冷却系に係る新概念技術の確率を目的とする大規模ナトリウム試験への要求条件を摘出し、試験施設の基本仕様を検討した。大規模ナトリウム試験では、系統熱過渡試験、自然循環崩壊熱除去試験、炉壁保護構造試験及び水蒸気系熱流動試験の4項目の熱流動及び機器構造に係る原子炉理冷却系統総合試験が実施され予定である。本報告書ではそれらの試験計画として、主に熱流動に関する課題、試験目的、期待される成果、試験項目及び試験の特徴をまとめた。ここで検討した試験施設は、実証炉に関する「国への要望」に応えるのはもちろんのこと、「FBR固有の技術」を確率する観点から、今後の長期に亘り高速炉の実用化に必要な技術開発に活用する総合的な大規模ナトリウム試験施設として位置付けられる。

Requirements for a large-scaled sodium test facility are examined to designate basic specifications that will answer to the needs for the development of innovative heat transport concepts of LMFBRs (Liquid Metal Fast Breeder Reactors), such as shortening of a main piping system, compact components including a reactor vessel and decay heat removal focussing on natural circulation. Four large-scaled sodium tests related to plant system dynamics, decay heat removal by natural circulation, protection of a reactor vessel wall and a steam generator are planed using an integral system model simulated a Japanese DFBR (Demonstration Fast Breeder Reactor) to study thermohydraulic characteristics of heat transport systems. In the present paper, notable points, objectives, expected results, test items and specific features of thermohydraulic tests are specified to confirm the concept of the test facility. The facility is positioned not only in responding to "demands from the utility group to the nation about large-scaled confirmation tests for DFBR", but also as an integral large-scaled sodium test facility that will be utilized over a long time from a view point of "establishing peculiar characteristic know-how of FBR" to pave the way for commercial LMFBRs.

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