Document: NUREG-0800
Document ID: 904b56ce-40c5-4058-b0ad-837d98f63c2a
Document Type: srp
Title: PROBABLE MAXIMUM FLOOD (PMF) ON STREAMS AND RIVERS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730405.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.3
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identification and consideration of the probable maximum flooding on streams and rivers at the site and in the surrounding area are acceptable and meet the requirements of 10 CFR Part 50, Appendix A, General Design Criterion 2 and 10 CFR Part 100 [10 CFR 100.10(c) or 10 CFR 100.20(c), as applicable], with respect to determining the acceptability of the site. The staff finds that the applicant has considered the appropriate site phenomena in establishing the design bases for SSCs important to safety. The staff has generally accepted the methodologies used to determine the probable maximum flooding on streams and rivers reflected in these design bases, as documented in safety evaluation reports for previous licensing actions. Accordingly, the staff concludes that the use of these methodologies results in design bases containing margin sufficient for the limited accuracy, quantity, and period of time in which the data have been accumulated. The staff concludes that the identified design bases meet the requirement(s) of 10 CFR Part 50, Appendix A, General Design Criterion 2 and 10 CFR 100.10(c) [or 10 CFR 100.20(c)], with respect to establishing the design basis for SSCs important to safety. 2. Early Site Permit Reviews. The following statements should be preceded by a summary of the site characteristics and design parameters to be included in any ESP that might be issued for the ESP site: As set forth above, the applicant has presented and substantiated sufficient information pertaining to the probable maximum flood on streams and rivers at the proposed site. Section 2.4.3, “Probable Maximum Flood (PMF) on Streams and Rivers,” of NUREG-0800, Standard Review Plan, provides that the site safety analysis report should address the requirements of 10 CFR Parts 52 and 100 as they relate to identifying and evaluating the probable maximum flood on streams and rivers. Further, the applicant considered local flooding of the site drainage under local intense precipitation in