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:
ion 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 (Concrete Structures): The existing records of alignment and elevation surveys and measurements from inclinometers, inverted plumb bobs, gauge points across cracks and joints, or other devices should be examined to determine any change from the original position of the structures. (3) Horizontal and Vertical Movement, Consolidation, and Pore-Water Pressure Instrumentation (Embankment Structures): The existing records of measurements from settlement plates or gauges, surface reference marks, slope indicators, and other devices should be examined to determine the movement history of the embankment. Existing piezometer measurements should be examined to determine if the pore-water pressures in the embankment and foundation would, under given conditions, impair the safety of the structure. Survey methods should also be inspected to evaluate the magnitude and rate of horizontal and vertical deformations of the surface monuments on and at the toes of embankment structures. Pre-Decisional DG-1245, Page 12 (4) Uplift Instrumentation: The existing records of uplift measurements should be examined to determine if the uplift pressures for the maximum pool would impair the safety of the structure. (5) Drainage System Instrumentation: The existing records of measurements of the drainage system flow should be examined to confirm the normal relationship between pool elevations and discharge quantities or to detect any changes that have occurred in this relationship. (6) Seismic Instrumentation: The existing records of seismic instrumentation should be examined to determine the seismic activity in the area and the response of the structures to recent earthquakes. (7) Remote-Monitoring Instrumentation: The use of remote-monitoring instrumentation should be considered to provide remote