[en] This paper presents the results of a review and updates of specific scenarios from four previous fire risk assessments. These four probabilistic risk assessments are those performed for Limerick, Indian Point Unit 2, Oconee, and Seabrook. The requantification work included the use of updated data bases and fire modeling techniques. Changes made to Indian Point Unit 2, Limerick, and Seabrook subsequent to the original risk assessment in response to implementation of 10CFR50 Appendix R have also been included in the requantification. For Oconee no Appendix R changes made subsequent to the performance of the original risk assessment were identified. Also presented is a discussion of the primary contributors to uncertainty in the analyses. 12 refs., 2 tabs