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高速実験炉「常陽」における原子炉容器内補修技術の開発と実践; MARICO-2試料部の回収

Development of repair techniques in the reactor vessel of the experimental fast reactor Joyo; MARICO-2 S/A retrieving

皆藤 泰昭; 芦田 貴志 ; 今泉 和幸 ; 伊澤 修; 内藤 裕之

Kaito, Yasuaki; Ashida, Takashi; Imaizumi, Kazuyuki; Izawa, Osamu; Naito, Hiroyuki

高速実験炉「常陽」では、MARICO-2 (計測線付実験装置)試料部が原子炉容器内の炉内燃料貯蔵ラック上で変形していることを確認した。確認試験の結果、MARICO-2試料部の変形により炉内燃料貯蔵ラックの移送ポットと分離ができないため、通常の取り扱い手順と経路では回収することができない状態であることから、専用の回収装置の開発を進めてきた。設計・開発においては、(1)高い信頼性で移送ポットと一体でMARICO-2試料部を確実に回収する方法(2)これまでの経験や実機寸法のモックアップ試験による確認結果に基づき設計を実施した。今回は原子炉容器内補修技術のうち、MARICO-2試料部の回収について記載する。

In the experimental fast reactor Joyo, it was confirmed that the top of the irradiation test sub-assembly(S/A) of MARICO-2 (material testing rig with temperature control) had been bent onto the in-vessel storage rack as an obstacle, and the MARICO-2 S/A had been stuck in the transfer pot owing to its deformation. Since the MARICO-2 S/A cannot be retrieved with the existing handling equipment, special handling equipment was developed while considering the anomalous conditions. Emphasis had been placed on (1) how to precisely control the gripper position in the reactor vessel, and (2) how to retrieve the MARICO-2 S/A together with transfer pot with high reliability in the design and development of equipment. The MARICO-2 S/A was retrieved successfully together with transfer pot in 2014. This paper describes the in-vessel repair techniques for MARICO-2 S/A retrieval.

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