The regulatory standards related to nuclear energy that have been enforced since the Great East Japan Earthquake require equipment that is important for safety against tsunami to maintain its integrity. However, at present there is no systematization of impact assessment methods for equipment that is important for safety regarding the collision of the tsunami drifting object. Therefore, in this research, a free fall test that simulates a collision with equipment that is important for safety (pipe) by the ts...
英字タイトル:
Study on the equipment integrity assessment at the time of a drifting object collision

At Hamaoka Nuclear Power Station, facilities for the safety improvement are increased, and efficient inspection methods are required. In particular, these are urgently needed for the tsunami protection wall and the exhaust stacks, which are difficult to inspect due to heights. In this report, we describe the verification results of the feasibility of the inspection using the drone and the high magnification camera, and propose efficient inspection methods....
英字タイトル:
Inspection methods using images of structures that cannot be easily inspected

We developed a technology for monitoring machine frequency by using a camera available on the market which is possible to install in place difficult to approach due to high temperature or radiation environments. This camera detects frequency by using Fast Fourier Transform (FFT) from images taken of equipment. Cavitation in the pump was measured using this camera and it was confirmed that it could be detected. By measuring the vibration frequency of the machine with this camera, it is possible to detect an ...
英字タイトル:
Development of technology to detect a damage foresee by image processing

Nuclear power plants are required not to lose safety functions against assumed natural phenomena as damage prevention from external impact. Among possible natural phenomena, it is known that blockage of the intake filter by volcanic ash occurs due to the volcanic effect. Therefore, we are investigating a volcanic ash removal system that uses a metal filter that can remove volcanic ash before the intake filter and supply clean air....
英字タイトル:
Examination of volcanic ash removal system using metal filter

The water of Suppression pool at severe accident has become a hot, high chloride ion concentration and strong alkaline because of exhaust of the reactor heat, the melted cable, and pH controller. The equipment using the water has wetted part made stainless, therefore there is a possibility that SCC because of chloride ion occurs this wetted part. However, alkaline environment may reduce a possibility the SCC although poor knowledge. As such we examined the effect of structural material in a hot, high chlori...
英字タイトル:
Effect assessment of structural material in a hot, high chloride ion concentration, and strong alkaline environment