The U.S. Nuclear Regulatory Commission (NRC) stated its belief in the final policy statement on the "Use of Probabilistic Risk Assessment (PRA) Methods in Nuclear Regulatory Activities" that the use of PRA technology in NRC regulatory activities should be increased. Subsequently, the NRC increased risk-informed activities in all areas of NRC regulation. With increased risk-informed activities comes the recognition that regulatory stability and efficiency would be enhanced if the various applications of risk-information are implemented consistently and predictably. A common understanding of information provides increased assurance that the analyses being performed are technically adequate and, therefore, produce correct results. Consistent terminology is essential to the appropriate implementation of risk-informed activities and the communication between the NRC and its stakeholders. It allows practitioners to eliminate communication issues and avoid unnecessary discussions that may have been erroneously perceived as technical issues. Therefore, a glossary with agreed-upon definitions of risk-informed related terms is an essential tool for future risk-informed activities. This paper discusses the draft version of such a glossary compiled by the NRC.
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