[en] The project aims to provide the regulatory direction of major technical issues related to the quantitative criteria for probabilistic risk analysis, establishment of containment performance criteria, design of additional water source for long-term corium cooling of core debris, protection against common mode failure of digital I and C system, criteria for safety-related operator action, quantitative reliability targets, classification of plant conditions and acceptance criteria and development of graded QA. These issues are parts of major technical issues resulted from the safety regulation R and D on the next generation reactor. Regulatory directions to be applied to the Korea Next Generation Reactors in this study are developed by analyzing the state-of-the-art of the development of local and foreign regulatory requirements, research trends, and the design features and safety goals of advanced reactors