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:
tervals discussed below should be used in developing projected inspection schedules. These intervals in no way preclude more frequent inspections if deemed necessary or less frequent inspections (with a minimum frequency of every 5 years) for those structures in which conditions or structural integrity warrant such relaxation. NOTE: In some cases, plant-specific licensing documents govern the frequency of inspections. a. Initial Inspection The first general onsite inspection should be carried out shortly after topping out for new earth and rockfill dams or water control structures and before the impoundment of reservoir water for new concrete structures. For existing facilities that are now in operation, inspection and monitoring programs should be implemented as soon as practicable if no prior inspections comparable to those described in this guide have been performed. Pre-Decisional DG-1245, Page 14 b. Subsequent Inspections The second inspection of earth and rockfill dams or water control structures should be performed at a reasonable stage of reservoir filling but in no case later than at the attainment of the normal operating pool level. The second inspection of concrete structures should be performed when the reservoir water attains the normal operating pool level but in no case later than 1 year after initial impoundment has begun. Subsequent inspections should be performed at 1-year intervals for the next 4 years and at 2-year intervals for the following 4 years; these inspections may then be extended to every 5 years if the results of the previous inspections warrant this extension. c. Special Inspections Special inspections of dams and other water-control structures should be performed as soon as practical after the structure has passed unusually large floods or after the occurrence of unusual events such as earthquakes, hurricanes, tornadoes, intense local rainfalls, etc. Such inspections should be followed by an engineering evaluation of the structural