E206 ナトリウム冷却型高速炉の原子炉容器内観察技術(高速炉基盤技術,OS8 軽水炉・新型炉・核燃料サイクル)

概要

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During the investigation of an incident that occurred with the experimental fast reactor Joyo, in-vessel observations using a video camera and a radiation-resistant fiberscope were conducted. As a result of observation, it was discovered that the top of the irradiation test subassembly "MARICO-2" (MAterial testing Rig with temperature COntrol) had bent onto the in-vessel storage rack and might have damaged the Upper Core Structure (UCS). In order to observe the bottom face of the UCS, a remote handling device equipped with fiberscope was specifically developed for Joyo with a tip that could be bent into an L-shape and inserted into the 70 mm gap between the top of the subassemblies and the bottom of the UCS. The observations were successfully made and the results provided useful information on incident investigations. These experiences provided valuable insights for use in further improving and verifying in-vessel observation techniques in Sodium cooled Fast Reactors.
2009-06-28