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:
ng activities prerequisite to concrete placement. However, the listing of these references in an appendix to this guide does not constitute a blanket endorsement of their contents. Individual material specifications (ASTM, etc.) are not included in Appendix A of this guide, since this guide addresses only the requirements for proper planning and coordination in placing concrete so as to avoid the recurring problems of voids, cracks, and bulges which have been experienced in nuclear power plant construction. C. REGULATORY POSITION The regulatory positions given below for the applicant, the designer, and the constructor together with the guidance from appropriate documents listed in Appendix A of this guide represent a minimum basis for assuring compliance with the Commission's regulations in Appendices A and B to Part 50 and should be supplemented as necessary in the appropriate quality assurance programs and project specifications. (As an example, in several areas ACI 301 lists stricter concrete sampling requirements than ACI 318. In such cases, the relevant provisions of ACI 301 should govern in the interest of obtaining the best concrete quality practical under existing industry practices.) 1. Applicant. The applicant's quality assurance program should ensure that early and regular communication is established between the designer and constructor. Rapid access to the designer should be possible for the constructor in the event that a field condition requires immediate consultation with the designer, such as relocation of a construction joint or an embedded item while placing of concrete is in progress. Conversely, the designer should have rapid access to the constructor in the event that late revisions must be made in the field because of changes in design. Under 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