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新型酸回収蒸発缶(新材料製)の詳細設計(1/2)

Detailed design of new material nitric acid recovery evaporator

横山 博巨*; 金沢 俊夫*; 福間 忠士*; 為清 好三*; 柳田 甲二*; 降矢 喬*; 河野 弘志*; 伊藤 圭二*; 白倉 貴雄*; 柏原 晋一郎*; 福留 豊*; 庄田 修二*; 広瀬 博章*; 仲野 修朗*; 小沢 雅夫*; 石田 敏充*; 川尻 修*; 掃部 茂*; 中沖 耕造*; 川村 重義*

Yokoyama, Hiroomi*; Kanazawa, Toshio*; Fukuma, Tadashi*; Tamekiyo, Kozo*; Yanagida, Koji*; Furuya, Takashi*; Kono, Hiroshi*; Ito, Keiji*; Shirakura, Takao*; Kashiwara, Shinichiro*; Fukutome, Yutaka*; Shoda, Shoji*; Hirose, Hiroaki*; Nakano, Nobuo*; Ozawa, Masao*; Ishida, Toshimitsu*; Kawajiri, Osamu*; Kamon, Shigeru*; Nakaoki, Kozo*; Kawamura, Shigeyoshi*

動燃再処理工場に設置されている既設蒸発缶(ステンレス綱製)を新材料製蒸発缶と交換 設置することを前提として、それに必要な詳細設計を実施した。すでに実施されている新型酸回収蒸発缶基本設計(2)ならびに小型モックアップ試験設備の設計、製作、異材継手・開発の成果を参考にした。蒸発缶の詳細設計、性能計算、耐震設計、板取り設計、異材継手設計、セル内配管設計、蒸発缶撤去、設置工事設計、蒸発缶の点検、保守設計、蒸発缶試運転計画、製作技術仕様書の検討、作業工程検討等を行った。

A detailed design for a New Material Nitric Acid Recovery Evaporator was carried out with a plan to use it to replace an already constructed stainless steel Nitric Acid Recovery Evaporator at the Power Reactor and Nuclear Fuel Development Corporation's Tokai Works. Most of the original Evaporator's conditions such as compliance with applicable laws, standards, structure, treatment performance and operating conditions were maintained when designing the new machine. The material is titanium with the addition of 5% tantalum. The Evaporator was designed with an operational life expectance of 10 years. We have calculated that the new Evaporator will have sufficient strength (including a seismatic design) and have the same evaporative performance as the already constructed one. During design, we referred to the results of already completed basic designs (Phase 1) of New Material Nitric Acid Recovery Evaporators, design and production of small-scale test equipment units, and the development of successful joints between different materials. We also considered manufacturing, installation, trial runs, maintenance, and the specifications for materials used for manufacturing, installation, piping and operation of the new Evaporator.

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