Although the Onagawa NPS was the closest nuclear power station to the epicenter of the Great East Japan Earthquake, the plant achieved cold shut down safely. In addition to keeping the cold shut down status after that, the inspections for confirming the soundness of the equipment are on-going according to the special maintenance program we made after the earthquake. Situation of the maintenance at the Onagawa NPS is presented in this paper. ...
英字タイトル:
Inspections after the Great East Japan Earthquake at the Onagawa Nuclear Power Station

The research and education program “Advanced Research and Education Program for Nuclear Decommissioning (ARED)” is proceeded in Tokyo Tech with views to sustainable development of human resources having advanced knowledge and experiences concerning decommissioning engineering, and development of advanced technologies to resolve a number of complicated challenges. This paper reports about the present status of the development of human resources. ...
英字タイトル:
Human resource development for the research and education program in Tokyo Tech

A large earthquake occurred on March 11, 2011 and tsunami was generated following it. The East Japan suffered serious damage by the earthquake and tsunami. This is called the Great East Japan Earthquake. Onagawa Nuclear Power Station (NPS) is located closest to the epicenter of Great East Japan Earthquake. We experienced intense shake by the earthquake and some flooding from the tsunami, however, we have succeeded safely cold shutdown of the reactors. In this paper, we introduce summary of Great East ...
英字タイトル:
Summary of Great East Japan Earthquake response at Onagawa Nuclear Power Station and further safety improvement measures

The main roles of in-vessel visual inspection (IVVI) are to detect cracks on the surface of internal structures and measure the length of the cracks. For accurately performing those matters by visual inspection, inspectors sometimes need to obtain three-dimensional (3D) measurements of cracks and 3D shape of the surface. We have been developing a prototype system to obtain 3D measurements. This system is based on stereo vision technique and has on ly one measurement head that has an inner movable camera m...
英字タイトル:
Three-Dimensional Measurement System for In-Vessel Visual Inspection

The main roles of in-vessel visual inspection (IVVI) are to observe internal structures and crack on the structure surface. For accurately checking those matter s by visual inspection, inspectors sometimes need three-dimensional (3D) recognitions. Therefore, we developed a prototype system that has only one inspection h ead to obtain 3D measurements. This system is based on our 3DVT (3 Dimensional Visual Testing) technique that we have been developing. This report proposes that prototype measurement head a...
英字タイトル:
Three-Dimensional Measurement System for In-Vessel Visual Inspection

In-Vessel Visual Inspection (IVVI) is usually conducted as indirect visual inspection with remote TV cameras. We often face the following issues in IVVI. When IVVI is conducted at narrow spa ce in the vessel, it is difficult for inspectors to set the cameras to the best position remotely and manually. When the cameras are quickly moved to reduce hours of IVVI, the visibility be comes poor because of motion blurs. For overcoming these problems, we focused on “Super Resolution (SR)” that is one of image proc...
英字タイトル:
In-Vessel Visual Inspection System using Super Resolution Technique