[en] According to the increase for risk-informed regulations and applications, the quality of a probabilistic safety assessment (PSA) has become more important. As a part of enhancing the PSA quality, a study was initiated to standardize the process and the rules of a human reliability analysis (HRA) which is known as a major contributor to the uncertainty of a PSA. Performing a HRA requires a lot of data to maintain the quality of the results. Korea Atomic Energy Research Institute (KAERI) is developing a HRA calculator to manage the human failure events (HFEs) and to calculate the diagnosis human error probabilities and execution human error probabilities. This report describes the development process of a standard HRA method and a HRA calculator. The study was carried out in three stages; 1) development of the procedures and rules for a standard HRA method, 2) design of database schema, 3) implementation of a graphic user interface and calculation logic to the HRA calculator