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大量ナトリウムの処理技術開発-ナトリウム転換基礎試験装置の製作と試運転結果-

Development of sodium conversion technology; Fabrication of sodium conversion test apparatus and results of previously test run

大道 正雄; 川崎 弘嗣; 遠藤 康志*; 仲井 悟

not registered; not registered; not registered; not registered

将来国内において、高速炉プラントの廃炉あるいはナトリウム試験施設の解体等に伴う大量の放射性ナトリウム処理に備え、安全で効率的、かつ経済的に処理するための技術開発を実施している。海外で実機レベルでの大量ナトリウム処理の実績がある苛性ソーダ処理法を採用し、これを国内で適用する上での基礎的な処理方法の確立を目指し、研究開発を開始した。 そこで、ナトリウムと苛性ソーダとの基礎的な反応特性の把握とその転換処理システムの最適仕様決定を目的とした「ナトリウム転換基礎試験装置(Sodium Conversion Test Apparatus:SCOT)」を設計・製作した。本装置のシステム機能を確認し、少量の反応試験を実施した結果、以下の知見と課題を得た。 (1)本試験装置のもつ各設備の機能試験においては、各機能及び制御性について、設計性能を十分満足した。 (2)苛性ソーダ濃度計の校正試験では、超音波音速値と苛性ソーダ濃度、温度との相関データを、従来より拡張された条件範囲で取得し、重回帰分析により校正曲線を得た。 (3)ナトリウムを苛性ソーダに微量注入する反応試験においては、反応現象あるいはプロセス挙動等に安全上の問題は認められなかった。しかし、本試運転では、ノイズ影響によるナトリウム流量計指示の変動、スプレーノズル部の閉塞、苛性ソーダ循環ラインへのアトマイジングガス巻き込み等、いくつかの問題が生じた。今後、抽出されたいくつかの課題について、装置改造及び運転要領の両面から対策する。

It prepares for a large amount of radioactive sodium processing accompanied by final shutdown/decommissioning of First Reactor Plant, and/or dismantling of sodium experimental facilities in a domestic one, and the technical development for sodium processing safely, efficiently, and economically is carried out in the future. The sodium processing method with caustic soda, which has application in the actual sodium processing of abroad, was adopted, and the experimental research was started aiming at establishment of the fundamental processig method when applying this in our country. Then, the sodium conversion test apparatus "SCOT" aiming at grasp of the basic reaction property of sodium and caustic soda, and the optimum specification determination of a sodium conversion processing system, was designed and fabricated. As a result of checking the system function of this apparatus and carrying out a small reaction test as a previously test run, the following findings and subjects of future were obtained. (1)In the functional test of each performance in this apparatus, the design performance was sufficiently satisfied on each function and controllability. (2)In the calibration test of a caustic soda concentration meter, the correlation data between ultrasonic velocity and caustic soda concentration as a function of caustic soda temperature was obtained in the condition range extended conventionally, and the calibration curve was proposed by multiple regression analysis. (3)In the reaction test which carries out very-small-quantity pouring of the sodium at caustic soda, the problem on the safety was not recognized a reaction phenomenon or a process behavior. However, some problems, such as fluctuation of the sodium flow meter indication by noise influence, plugging in the spray nozzle, and involvement atomizing gas in a caustic soda circulation line, were occurred in this test run. In the future, it will be coped with from both sides of the equipment modificatkm ...

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