[en] The number of nuclear power plants in Japan that have been operating for more than 30 years since their commissioning is increasing. Toshiba has developed a high-quality maintenance technology called Plant Reconstruction, for the preventive maintenance of aged nuclear power plant equipment. The use of this technology for maintenance makes it possible to improve the operating rate of a nuclear power plant and achieve as much as 60 years of stable operation. Plants to be reconstructed with this technology are considered in terms of various aspects including improvement of reliability and performance, compliance with new regulations, reduction of radioactivity, and improvement of maintainability, thereby contributing to enhancement of the value of the plant and realizing a high return on investment. (author)