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:
ed as conservative, it will be necessary to use unsteady flow methods to develop flood levels at the site. References 11 and 12 are acceptable methods; however, other programs would be acceptable with proper documentation and justification. Computations, coefficients, and methods used to establish the water level at the site for the most critical dam failures must be summarized. Coincident wind-generated wave 'activity should be con- sidered in a manner similar to that discussed in SRP Section 2.4.3. Appropriate sections of the guides described below are used by the staff to determine the acceptability of the applicant's data and analyses. Regulatory Guide 1.59, which incorporates ANSI N170, provides guidance for estimating the design basis for flooding considering the worst single phenomena and combina- tion of less severe phenomena. Regulatory Guide 1.29 identifies the safety- related structures, systems, and components, and Regulatory Guide 1.102 describes acceptable flood protection to prevent the safety-related facilities from being adversely affected. III. REVIEW PROCEDURES The conservatism of the applicant's estimates of flood potential and low water levels from structure failures is judged against the criteria indicated in subsection II above. An analysis is performed using simplified, conservative procedures (such an instantaneous failure, coincident SPF flows, minimal flood wave attenuation, and extrapolated site discharge-rating curves). Techniques for such analyses are identified in standard hydraulic design references and text books, such as those listed in the reference section. If no potential flood problem exists, the staff safety evaluation report (SER) input is written accordingly. If the simplified analysis indicates a potential flooding problem, the analysis is repeated using a more refined technique which may include time rate of failure and hydrometeorologically compatible storm centerings. Detailed failure models, such as those of the Corps of