Since May 2002, the OECD/NEA has operated an event database on passive component degradation and failure. During 2002-2011 the project, referred to as OPDE, focused on piping component failure events. In May 2011, the Project Review Group approved the transition of OPDE to a new, expanded "OECD-NEA Component Operational Experience, Degradation and Aging Program (CODAP)." The objective of CODAP is to collect information on passive metallic component degradation and failures of the primary system, reactor pressure vessel internals, main process and safety systems, and support systems (i.e., ASME Code Class 1,2 and 3 systems). It also covers non-safety related components with significant operational impact. With the 2011 transition from OPDE to CODAP, a new and enhanced web-based database format was implemented. As of mid-2012, the entire CODAP event database resides on a secure server at NEA Headquarters. Provisions exist for online database interrogation as well as downloading selected database records or the entire database to a local computer or computer network. In addition to the event records, the Knowledge Base contains national and international reference material on damage and degradation mechanisms, codes and standards, R&D results, regulatory frameworks, and country-specific aging management frameworks. The CODAP Project has developed a comprehensive web-based event database that is supported by a web-based Knowledge Base. This paper describes the project structure, project participation and lessons learned from significant PSA applications of the database and R&D to advance the passive component reliability analysis state-of-the-art.