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:
ined. (5) Intake Structure: The intake structure and features should be examined for conditions that may impose operational constraints on the outlet works. Entrances to the intake structure should be examined for conditions such as silt or debris accumulation that may reduce the discharge capabilities of the outlet works. (6) Conduits, Sluices, and Water Passages: The interior surfaces of conduits should be examined for erosion, corrosion, cavitation, cracks, joint separation, and leakage at cracks or joints. (7) Drawdown Facilities: Facilities provided for the drawdown of the water level should be examined for conditions that may impose constraints on their proper functioning. d. Reservoirs The inspection and monitoring program for the reservoir should include inspections for conditions that may impose operational constraints on the cooling system or that may be hazardous to the safety of the dam or other water control structures. This program should include: (1) Shore Line: The landforms around the reservoir should be examined for indications of major active or inactive landslide areas and for their susceptibility to landslides of sufficient magnitude to significantly reduce reservoir capacity or create waves that might overtop the dam. (2) Sedimentation: The reservoir and drainage area should be examined for excessive sedimentation or recent developments in the drainage basin that could cause a sudden increase in sediment load, thereby reducing the reservoir capacity with an attendant increase in the maximum outflow and maximum pool elevation. (3) Potential Upstream Hazard Areas: The reservoir area should be examined for changes with a potential for hazardous backwater flooding. Pre-Decisional DG-1245, Page 11 (4) Watershed Runoff Potential: The drainage basin 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