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:
bulkheads and flashboards, of service and auxiliary spillways for conditions that may impose operational constraints on the spillway. The outlet works inspection and monitoring program should include structures and features designed to release reservoir water below the spillway crest through or around the dam. The following spillway structures and outlet works should be examined: (1) Control Gates and Operating Machinery: The structural members, connections, hoists, cables, and operating machinery and the adequacy of normal and emergency equipment Pre-Decisional DG-1245, Page 10 should be examined and tested to determine the structural integrity and verify the operational adequacy of the equipment. In areas where cranes will be used for handling gates and bulkheads, the capacity and operating condition of the cranes and lifting beams should be verified. Operability of control systems and protective and alarm devices such as limit switches, sump high-water alarms, and drainage should be verified. (2) Unlined Saddle Spillways: If unlined saddle spillways are used, they should be examined for evidence of erosion and conditions that may impose constraints on the functioning of the spillway. (3) Approach and Outlet Channels: The approach and outlet channels should be examined for conditions that may impose constraints on the functioning of the spillway and the outlet works. (4) Stilling Basin (Energy Dissipators): Stilling basins, including baffles, flip buckets, or other energy dissipators, should be examined for conditions that may impose constraints on the ability of the stilling basin to prevent downstream scour or erosion that may create or present a potential hazard to the safety of the dam. The condition of the channel downstream of the stilling basin should be examined. (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