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:
n should be examined for any extensive recent alterations to the surface of the drainage basin such as changed agricultural practices, timber clearing, railroad or highway construction, or real estate developments that might adversely affect the runoff characteristics. Upstream projects that could have an impact on the safety of the dam should be identified. e. Cooling-Water Channels and Canals and Intake and Discharge Structures The cooling-water channels and canals and intake and discharge structures should be inspected as follows: (1) Channels and Canals: The water conveyance channels and canals should be inspected for channel bank erosion, bed aggradation or degradation and siltation, undesirable vegetation, or any unusual or inadequate operational behavior. (2) Intake and Discharge Structures: The structures and all features should be inspected for any conditions that may impose operational constraints on the cooling facilities such as silt or debris accumulation at the water intake or discharge. f. Safety and Performance Instrumentation Instruments that have been installed to measure/monitor the behavior of the structures should be examined and tested for proper functioning. The available records and readings of installed instruments should be reviewed to detect any unusual performance or distress of the structure. The adequacy of the installed instrumentation to measure the performance and safety of the dam and other water control structures should be evaluated. Records of the following instrumentation (if available) should be examined to determine any potential problems: (1) Headwater and Tailwater Gauges: The existing records of the headwater and tailwater gauge measurements should be examined to determine the relationship between these and other instrumentation measurements such as streamflow, uplift pressures, alignment, and drainage system discharge with the upper and lower water surface elevations. (2) Horizontal and Vertical Alignment Instrumentation