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:
ctivity 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 access and alert for a wide variety of instruments. g. Operation and Maintenance Features The following operation and maintenance features should be examined: (1) Reservoir Regulation Plan: The actual practices in regulating the reservoir and discharges under normal and emergency conditions should be examined to determine if these practices comply with the designed reservoir regulation plan. (2) Maintenance: The maintenance of the operating facilities and features that pertain to the safety of the water control structure should be examined to determine the adequacy and quality of the maintenance procedures followed in maintaining the facilities in a safe operating condition. h. Post-Construction Changes Baseline inspection data on the construction changes of safety-related structures should be collected during and after the construction phases, where the safety of the structures could be adversely affected. 6. Technical Evaluation When findings of the engineering data review or the inspection and monitoring program indicate that changes have occurred, an evaluation of the existing conditions of the water-control structure should be made as discussed below. The evaluation should include the assessment of the hydraulic and hydrologic capacities and the structural stability based on the changes. Pre-Decisional DG-1245, Page 13 a. Hydraulic and Hydrologic Design Capacities Hydraulic and hydrologic design capacities should be evaluated in accordance with applicable portions of RG 1.59, “Design-Basis Floods for Nuclear Power Plants” (Ref. 18), RG 1.102, “Flood Protection for Nuclear Power Plants” (Ref. 19) and RG 1.27, “Ultimate Heat Sink for Nuclear Power Plants” (Ref. 20). The evaluation should consider constraints on water control such as blocked entrances,