Ikata NPS (Nuclear Power Station) is tackling various problems, maintenance optimization, technical capability upgrading, encouraging talent, transferring technical knowledge, etc. with the aims of pursuing world-class technical capability and competitiveness. Referring to nuclear power plants in USA which have achieved high performance Ikata NPS changed the maintenance process and implemented condition based maintenance such as monitoring of vibration, lubricant and so on. So Ikata NPS could not only reduce the maintenance work volume but also improve the plant reliability by preventing any trouble proactively.