This article presents the Autorité de sûreté nucléaire et de radioprotection's investigation approach to the quality of analyses of significant radiation protection events and significant event reports. Despite the use of methods recognised by the institutions (ORION and ALARM(E)…), the Autorité de sûreté nucléaire et de radioprotection notes inadequacies in the content of these documents for all medical applications using ionising radiation. The first results, based on the responses to the test questionnaire, show that the cultures of individual fault and silence, the lack of availability of participants as well as their initial and continuing training are causes limiting data acquisition, the analysis of significant radiation protection events and their correction and prevention.