ゲル化振動充填燃料小規模製造施設の調査

Investigation of small scale sphere-pac fuel fabrication plant with external gelation process

前川 一彦*; 吉村 忠宏*; 菊池 俊明*; 星野 康史*; 宗片 英樹*; 清水 真*

Maekawa, Kazuhiko*; Yoshimura, Tadahiro*; Kikuchi, Toshiaki*; Hoshino, Yasushi*; Munekata, Hideki*; Shimizu, Makoto*

FBRサイクル実用化戦略調査研究では、候補となるFBRサイクルシステムについて安全性、経済性、環境負荷低減性、核拡散抵抗性、運転・保守補修性などの観点から総合的なシステム検討と特性評価を行っている。その一環として、FBR燃料を対象とする外部ゲル化プロセスによる振動充填燃料製造施設について調査を行った。 昨年度までに生産規模200tHM/yの燃料製造施設について、ゲル化工程および試薬回収工程の主要機器の概略検討を行うとともに、セル内機器配置設計、建屋配置設計を行い、安全性、経済性、廃棄物発生量等の検討を行ってきた。 今年度は、これまでの顆粒製造工程のほかに振動充填以降、燃料集合体貯蔵庫までを調査範囲に加え、遠隔自動化および遠隔保守性の観点から、主要機器の設計検討を深めるとともに、経済性を追求した小規模製造施設全体の概念を構築した。施設検討は50tHM/y規模施設を中心に実施し、生産規模200tHM/yの燃料製造施設についても見直し検討を行った。また、他の燃料製造システムとの比較評価を行うことを念頭に置き、振動充填以降の工程機器については、共通とするべき機器はペレット燃料製造と同等設計とした。その他、設計検討に基づき各規模施設の経済性及び環境負荷低減性に係わるシステム特性評価データを取得した。従来の設計と比較して、ゲル化顆粒製造工程についてはプラグ輸送型の気流輸送設備の採用などを前提として工程セルの高さを下げ、振動充填以降の工程については、ペレット燃料製造の合理化配置を適用することで、燃料製造建屋がコンパクトになった。

In feasibility studies on commercialized FBR cycle system, comprehensive system investigation and properties evaluation for candidate FBR cycle systems have been implemented through view point of safety, economics, environmental burden reduction, non-proliferation resistivity, etc. As part of these studies, an investigation of small scale sphere-pac fuel fabrication plant with external gelation process was conducted. Until last fiscal year, equipment layout in cells and overall layout design of the 200t-HM/y scale fuel fabrication plant were conducted as well as schematical design studies on main equipments in gelation and reagent recovery processes of the plant. System property data concerning economics and environmental burden reduction of fuel fabrication plant was also acquired. In this fiscal year, the processes from vibropacking to fuel assemblies storage were added to the investigation range, and a conceptual design of whole fuel fabrication plant was studied as well as deepening the design study on main equipments. The conceptual design study was mainly conducted for small 50t-HM/y scale plant and a revising investigation was done for 200t-HM/y scale Plant. Taking the planed comparative evaluation with pellet fuel fabrication system into account, design of equipments which should be equivalent with pellet system, especially in post-vibropacking processes, were standardized in each system. Based on these design studies, system properties data concerning economics and environmental burden reduction of the plant was also acquired. In comparison with existing design, the cell height was lowered on condition that plug type pneumatic system was adopted and fuel fabrication building was downsized by applying rationalized layout design of pellet system to post-vibropacking processes. Reduction of reagent usage at gelation process and rationalization of sintering and O/M controlling processes etc., are foremost tasks.