Document: NUREG-0800
Document ID: 22df8787-ae92-4706-b796-d1b326c09e3c
Document Type: srp
Title: POTENTIAL DAM FAILURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340533.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.4
CFR Part: 
CFR Title: 

Content:
of possible bores on exposed plant facilities. 8. Conservative flow conditions for downstream dam failures that can influence safety-related water supplies. 9. Applicability and conservatism of models used to predict the effects of dam failure floods including breach shape and rate of failure. II. ACCEPTANCE CRITERIA Acceptance criteria for this SRP section are based on meeting the requirements of the following regulations: 1. General Design Criterion 2 (GDC 2) as it relates to structures, systems and components important to safety being designed to withstand floods. 2. 10 CFR Part 100 as it relates to evaluating hydrologic features of the site. 3. 10 CFR Part 100, Appendix A as it relates to establishing the design basis flood due to seismic dam failure. To meet the requirements of GDC 2, 10 CFR Part 100, and 10 CFR Part 100, Appendix A, as they relate to dam failures, the following specific criteria are used: The staff will review the applicant's analyses and independently assess the coincident river flows at the site and at the dams being analyzed. ANSI N170 provides guidance on acceptable river flow conditions to be assumed coincident with the dam failure event. The applicant's estimates (which may include land- slide-induced failures) of the flood discharge resulting from the coincident events should be no more than 5% less conservative than the staff's estimates to be acceptable. If the applicant's estimates differ by more than 5%, the applicant should fully document and justify its estimates or accept the staff's estimates and redesign applicable flood protection. For SAR Section 2.4.4.1 (Dam Failure Permutations): The location of dams and potentially "likely" or severe modes of failure must be identified. The poten- tial for multiple, seismically-induced dam failures and the domino failure of a series of dams must be discussed. Approved models of the Corps of Engineers and the Tennessee Valley Authority are used to predict the downstream water levels