In order to improve the operational reliability of automatic closure system(hereinafter referred to as "flap gates") used at air conditioning openings of buildings as a measure to protect Hamaoka NPP against tsunami, outdoor exposure test of actual equipment and components , And grasped the deterioration tendency. By making use of the exposure test results in maintenance, we were able to set up a reasonable and appropriate maintenance cycle and to enhance the safety of the Hamaoka NPP. ...
英字タイトル:
Degradation characteristics of flap gate under outdoor environment

As the lessons learned from the Fukushima Daiichi NPP accident, we will implement installing the sea wall in order to block direct intrusion of tsunami on Hamaoka Nuclear Power Station. In addition, assuming a tsunami higher than the sea wall, we will implement countermeasures to prevent flooding inside the building and the important equipment containment room. In this paper, we present countermeasures to prevent flooding for penetrations and openings of ventilation. ...
英字タイトル:
Prevention measures of flooding inside building at Hamaoka NPS

In order to verify the operational reliability of automatic closure system(hereinafter referred to as “flap gates“) used at air conditioning openings of buildings as a measure to protect Hamaoka Nuclear Power Station against tsunami, operational tests on actual size equipment has been conducted. Tests showed reliable operation in response to repeated rises in the water level. Tests also showed normal operation of flap gates in the case of waves containing debris and sediment. ...
英字タイトル:
Use of flap gates at building openings of Hamaoka Nuclear Power Station

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

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