It is important for the utilities to continuously pursue enhanced safety evaluation and safety improvement measures while thinking and acting by themselves besides the implementation of safety measures in order to maintain and improve the safety of nuclear power plants. In this regard, discussion and examination on various documents and guidelines regarding the risk-informed approach have been continued by stakeholders. It is necessary to identify credible events by using risk information and find rational and effective measures to mitigate the progression of events and mitigate environmental impacts by excluding factors that reduce the safety of nuclear power plants. The Standards Committee (SC) of Atomic Energy Society of Japan (AESJ) published several PRA standards and the standards for risk-informed activities, and technical reports showing interpretations and examples for smooth and effective application of these standards. As a result, SC has developed a standard providing the requirements for implementing the standardized process of Integrated Risk-Informed Decision Making (IRIDM) while recognizing the importance of establishing the guidelines on how to evaluate, determine and utilize risks so that the utilities can utilize risk information effectively and work on the safety improvement measures on a continuous basis into the future. This paper shows outline of the standards for risk-informed activities, i.e. the IRIDM standard and the PSR+ (Proactive Safety Review) guide, and the relationship between some regulatory systems for continuous safety improvement of Japanese nuclear power plants and some risk application standards. This paper also explains the status of discussion over the establishment of basic requirements to be incorporated into the new IRIDM standard. In addition, examples of possible applications of this standard and the future approach to utilize this standard for enhancement of the safety of Japanese nuclear power plants are also shown. In particular, an utmost effort is being made to formulate a useful and practical IRIDM standard incorporating the basic requirements and example cases so that the user can utilize the standard in various decision-making processes by collecting various information, such as operating experience and risk management resources (organizations, funds, time, etc.) as well as risk information, including Probabilistic Risk Assessment (PRA) results, evaluating the collected information, making a decision in an integrated manner, and then implementing the total management.