Document: NRC Regulatory Guide
Document ID: 8b2255d1-47a9-4dfe-ba41-568c561a89ee
Document Type: regulatory_guide
Title: Inspection of Water-Control Structures Associated with Nuclear Power Plants + HISTORY – HISTORY 01/2015 – DG-1245 , Proposed Revision 2 (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1325/ML13255A435.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.127
CFR Part: 
CFR Title: 

Content:
l load conditions. Attention should be focused on inspection and data collection during relatively rapid changes in reservoir water surface elevations. In addition, year-to-year conditions at high and low seasonal levels should be compared. Data should also be collected on changes occurring since project construction that may influence the safety and function of the facilities. It is important that abnormalities affecting facility safety be corrected in a timely manner. The service water channels should be examined for any conditions such as channel bank erosion, aggradations, or degradations that may impose constraints on the function of the cooling system and present a potential hazard to the safety of the plant. Submerged dams and emergency canals (e.g., artificially dredged canals at the river bed or the bottom of the reservoir) should be examined for any conditions (e.g., blockage caused by sedimentation, debris, or slope instability) that may impair the function of the canals under extreme low-flow conditions. Harmonization with International Standards The International Atomic Energy Agency (IAEA) has established a series of safety guides and standards constituting a high level of safety for protecting people and the environment. IAEA safety guides present international good practices and increasingly reflect best practices to help users striving to Pre-Decisional DG-1245, Page 5 achieve high levels of safety. The following three IAEA safety standards contain guidance similar to the guidance in this RG. 1. IAEA Safety Guide NS-G-2.6, “Maintenance, Surveillance and In-Service Inspections in Nuclear Power Plants,” issued August 2002; (Ref. 11) 2. IAEA Safety Standard SSG-18, “Meteorological and Hazards in Site Evaluation for Nuclear Installations,” issued November 2011 (Ref. 12); and 3. IAEA Safety Standard NS-G-1.5, “External Events Excluding Earthquakes in the Design of Nuclear Power Plants,” issued November 2003 (Ref. 13). While this RG does not