Document: NRC Regulatory Guide
Document ID: c64ed18e-c0e6-4b9a-8f77-2dc65c76782d
Document Type: regulatory_guide
Title: Concrete Placement in Category I Structures
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1306/ML13064A106.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.55
CFR Part: 
CFR Title: 

Content:
r the provisions of Appendix B to Part 50, the applicant's quality assurance program should also ensure the implementation of sections C.2. and C.3. below. 2. Designer a. The designer should check the design and shop drawings for practicality of: (1) Placement of reinforcing bars-continuity, congestion, interference, non-planar geometric bending and placing requirements, splice locations and their .effect on minimum bar spacing. (2) Location of embedded items-feasibility of placing concrete completely around the item, considering congestion and interference from other embedded items and reinforcing as well as the type of concrete to be placed (slump, aggregate size, whether preplaced appregate is used, etc.). (3) Locations of construction joints-locations of acceptable construction joints should be noted, as well as any "windows" in congested reinforcing patterns needed for placing the concrete. Followup coordination and revision with the constructor is essential. Factors for consideration include: type and quantity of concrete to be placed; shrinkage and creep; accessibility; cleanout capability before and after placing the concrete; and acceptability from a strength or functional point of view. Alternative joint locations should be available to the constructor in the event that concrete placement cannot be completed as planned and started. b. In addition to checking the drawings as noted above, the designer should assist the constructor as necessary in preplanning placement of reinforcement, embedded items, and concrete as well as the sequence to be followed in placing concrete. The designer should also follow the construction while it is in progress, including, if necessary, occasional site visits, and be available for assistance in resolving unanticipated field placement problems that might affect the structural or functional integrity of the structure. Field generated revisions should be approved by the designer. 3. Constructor. In addition-to the coordination