Document: NRC Regulatory Guide
Document ID: 0983c879-43f8-412c-9dbd-bbadabdfe3f3
Document Type: regulatory_guide
Title: Mechanical (Rev. 1)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1306/ML13064A126.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.10
CFR Part: 
CFR Title: 

Content:
Revision 1 1/2/73 U.S. ATOMIC ENERGY COMMISSION R E GU LATO R Y GI DIRECTORATE OF REGULATORY STANDARDS REGULATORY GUIDE 1.10 MECHANICAL (CADWELD) SPLICES IN REINFORCING BARS . OF CATEGORY I CONCRETE STRUCTURES1 J IDE A. INTRODUCTION General Design Criterion 1 of Appendix A to 10 CFR Part 50, "General Design Criteria for Nuclear Power Plants," requires that structures, systems and components important to safety be designed, fabricated, erected and tested to quality standards commensurate with the importance of the safety functions to be performed. This guide describes an acceptable method of implementing this criterion with regard to the testing and sampling of mechanical splices in reinforcing bars used on Category I concrete structures. 2 The Advisory Committee on Reactor Safeguards has been consulted concerning this guide and has concurred in the regulatory position. B. DISCUSSION Reinforcing bats for concrete structures are joined together either by lapping, welding, or mechanical splicing. The most common type of mechanical splice is called a Cadweld splice. The minimum requirements for lapping and welding splices are established by existing codes; however, the strength and testing requirements for mechanical splices are not specifically defined in such codes. The mechanical (Cadweld) splice is used most frequently for #14 and #18 reinforcing bars because (1) the welding of these bars can be performed reliably only if the bar chemistry is controlled and the bar chemistry This guide is a revision of former Safety Guide 10. As such, it is applicable to water-cooled nuclear power plants. 2 Structures, systems and components of a nuclear power plant are designated as Category I if they are designed to withstand the effects of the Safe Shutdown Earthquake (SSE) and remain functional. See Safety Guide 29, "Seismic Design Classification." is not normally controlled to an extent that would permit reliable welding, and (2) the lapping of these bars is prohibited by