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

In Hamaoka Nuclear Power Station No.5, condenser tube broke on May 14, 2011, and a large quantity of seawater invaded in the wide area of the plant. The seawater contained a highly-concentrated chloride ion. Because the corrosion influence on equipments which constituted a plant was concerned about, we decided to remove a chloride ion in a desali nation plant. The desalination plant was manufactured from the quality of the general industrial product, we adopted some design changes and special inspection p...
英字タイトル:
Summary of the purification with the desalination plant of the seawater which invaded to a condenser of theHAMAOKA Nuclear Power Station No.5

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