Diversity metric evaluation considering extended NUREG-7007 diversity classification

This paper describes some limitations of NUREG-7007 based technique of diversity assessment. Possible errors of the assessment and the consequences of these errors in case of extending the NUREG-7007 diversity classification by new subtypes are considered. Two approaches to improve the diversity assessment are proposed taking into account new diversity subtypes. The modernized technique and tool considering the extending NUREG-7007 diversity classification with the third and fourth levels to minimize or exclude risk of assessment errors is suggested in this paper.