Probabilistic Safety Assessment (PSA) can be used to evaluate the safety of Nuclear Power Plants (NPPs). To improve NPPs’ safety, reactor safety technology is always developing. Each technology will have a different hazard that can cause an Initiating Event (IE). Of course, this development will affect IE. IE is the event that can affect normal operation and have the potential to cause worst-case conditions when the mitigation system does not work properly. A comprehensive, detailed bibliometric analysis of NPP PSA and IE remains absent from the literature. The objective of this paper is to discuss existing research and identify future trends through bibliometric analysis and a literature review in the PSA and IE domains. The search criteria include the keywords, publication period, publication type, and language. Ninety-five scientific papers were identified during the first screening and were included in the bibliometric analysis. The Bibliometric analysis will represent the keyword network using VOSviewer 1.6.20. The second screening stage is used to strengthen the analysis and generate 43 articles as objects for the literature review. The results showed that the topic of identifying and developing identification methods has not been widely discussed and has become an important research topic. The results of this analysis strengthen the research hypothesis that developing IE methods for new technology NPPs, including High Temperature Gas Cooled Reactors (HTGRs), is feasible. © 2025, Gadjah Mada University. All rights reserved.