Tohoku Electric Power Co. has submitted its final report over the inadequate maintenance of pipes at its Onagawa nuclear power plant in Miyagi Prefecture to the Nuclear and Industrial Safety Agency.
The firm's report, submitted Monday, includes the result of examinations of damaged pipes and its review of methods to minimize wear and tear of equipment following government instructions to conduct a full check of the utility's quality assurance system due to poor safety management of its reactors.
Tohoku Electric said it will soon submit the results of its full check to the central government.
According to the results of the pipe examinations, the firm checked pipes at about 2,200 locations in the No. 1, 2 and 3 reactors, where there was the possibility of corrosion or other type of damage, and found four locations at the No. 1 and 2 reactors where there was significant wear.
Tohoku Electric said in the final report it will increase its checks and inspection sites.
The Ministry of Economy, Trade and Industry's nuclear safety agency said the report, including the outcome of a study into the causes and the review of methods to ensure pipes maintained a proper thickness, was "appropriate."