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照射設備である水力ラビット1号照射装置の解体・撤去に係る検討

Feasibility study on dismantling and removal of hydraulic rabbit No.1 irradiation facility

馬籠 博克; 飯村 光一 ; 松井 義典 

Magome, Hirokatsu; Iimura, Koichi; Matsui, Yoshinori

JMTRの廃止措置に伴う水力ラビット1号照射装置の解体撤去について、過去に実施した水力ラビット2号照射装置の撤去作業の経験に基づいて、解体・撤去計画を策定するための留意事項と解体・撤去後に維持すべき機器の管理について検討した。この結果、配管類の撤去に関しては冷却水漏えい防止に必要な遮断弁や閉止フランジ等を追加する必要があること、炉プール内配管の撤去に関しては引抜治具等を事前に準備する必要があること、残存する配管は地震等の外力に耐える様に短尺化する必要があることが明らかになった。また、撤去後の維持すべき機器の管理については、3パターンの地上部機器の撤去方法に関して必要な管理方法を整理した。

As to the removal of the hydraulic rabbit No.1 irradiation facility related to the decommissioning of JMTR, points to be noted for considering a removal plan and maintenance methods after the removal were studied based on the past experiences of removing the hydraulic rabbit No.2 irradiation facility. As results, it became clear that it was necessary to (1) add a shutoff valve and a closing flange to piping for preventing cooling water leakage, (2) prepare a drawing jig for inner tube, and (3) shorten the remaining piping to withstand earthquakes. In addition, regarding the management of equipment to be maintained after removal, the necessary management items for the removal methods of the three patterns of ground equipments were listed.

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