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:
e set forth in RGs will be deemed acceptable if they provide a basis for the findings required for the issuance or continuance of a permit or license by the Commission. Paperwork Reduction Act This RG contains information collection requirements covered by 10 CFR Part 50 and 10 CFR Part 52 that the Office of Management and Budget (OMB) approved under OMB control numbers 3150- 0011 and 3150-0151, respectively. The NRC may neither conduct nor sponsor, and a person is not required to respond to, an information collection request or requirement unless the requesting document displays a currently valid OMB control number. B. DISCUSSION Discussion Nuclear power plants use dams, slopes, canals, and other water-control structures and associated facilities, to impound, retain, and divert water sources for the reliable operation of emergency cooling systems. Failure of the water-control structures to perform their functions could trigger flooding or result in a failure of the emergency cooling systems. Therefore, a high degree of reliable performance is necessary for safe plant operation. Dams and other water control structures should be maintained in good working order throughout their lives. Inspection and monitoring should be conducted in such a manner that changes in structural, hydraulic, and foundation conditions of the dam or other water control structure can be detected promptly. In addition, the design of features used for inspecting and monitoring these structures should be such that these activities can be performed following a design basis event. According to the Association of State Dam Safety Officials (Ref. 10), the most common causes of dam and other water control structure failures are: 1. Overtopping due to flooding, inadequate spillway design, debris blockage of spillways, or settlement of the dam crest account for approximately 34 percent of all failures. 2. Foundation defects, including settlement and slope instability, cause about 30 percent of all