Document: NUREG-0800
Document ID: 482aa99f-2f4b-4e4c-b6c4-3ad5b3d83b59
Document Type: srp
Title: COOLING WATER CANALS AND RESERVOIRS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0707/ML070730431.pdf
Revision Date: 2023-06
Chapter: 2
Section ID: 2.4.8
CFR Part: 
CFR Title: 

Content:
t of the ultimate heat sink. 3. Hydraulic Design Bases of Reservoirs: The staff reviews the design bases of reservoirs pertaining to wind wave and runup coincident with the highest flood water surface elevation from one or a reasonable combination of flooding mechanisms evaluated separately in the applicant’s SAR Sections 2.4.2, 2.4.3, 2.4.4, 2.4.5, 2.4.6, and 2.4.7. The staff uses U.S. Army Corps of Engineers (USACE) criteria and methods for review of the design bases of embankment protection such as riprap, grass, soil cement, tetrapods, dolosse, etc. Input from the review of SAR Section 2.4.7 is considered for ice-induced hazards, including flooding, forces on structures and components, ice blockages, and interruptions of safety-related cooling water supply. The staff review of the design bases will also consider design conditions that ensure stability of the embankment. More specifically, the review will consider, as appropriate, the following: 1) Stability analysis during and at the end of construction, 2) Stability analysis for conditions of steady state seepage, 3) Stability analysis during conditions of sudden drawdown, and 4) Stability analysis for earthquake loading. The spillway design is reviewed with respect to its ability to safely discharge the PMF or another controlling design-basis flood, with antecedent conditions, as discussed in Regulatory Guide 1.59, without endangering safety-related facilities or increasing the hazard to downstream residents. Regulatory Guide 1.125 provides guidance in the use and evaluation of physical models for design and operation of hydraulic structures and systems for nuclear power plants. The staff also reviews the necessity of a low-level outlet to assist in emergency discharge of floods. The lowest water surface elevation in reservoirs is determined by routing the flow during the design basis drought, determined during review of SAR Section 2.4.11, through the reservoir using standard methods suggested by the USACE.