Document: NRC Regulatory Guide
Document ID: 3c238fa7-baa2-41c1-ac85-868fcda6b038
Document Type: regulatory_guide
Title: Design Limits, Loading Combinations, Materials, Construction, and Testing of Concrete Containments + HISTORY – HISTORY 07/2020 – DG-1372 , Proposed Revision 4 05/2019 – Periodic Review of Revision 3 – Revise 10/2015 – Periodic Review of Revision 3 – Reviewed with issues identified for future consideration 10/2006 – DG-1159, Proposed Revision 3 Prior to the issuance of DG-1159, RG 1.136 was entitled "Materials, Construction, and Testing of Concrete Containments (Rev. 4)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2010/ML20105A215.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.136
CFR Part: 
CFR Title: 

Content:
esign-basis accident pressure. Further, containment structures are expected to withstand beyond-design-basis accidents, earthquakes, and other extreme events. Consequently, Type 2 mechanical or welded splices and mechanical headed bar systems should be used in concrete containment structures. Therefore, the criterion in the ASME Code, which is the equivalent to the criterion for Type 1 mechanical or welded splices in ACI 318-14 and ACI 318-19, is not an adequate criterion for qualifying mechanical splices for use in concrete containment structures. Thus, the regulatory position provides a more stringent strength criterion for qualification of mechanical splices and headed deformed bar systems, and the same criterion should also be used for continuing splice performance tests for production in the field. Additionally, subparagraph CC-2331.2 of the Code and ASTM A706 also specify for reinforcing steel both a lower limit (fy) and an upper limit (fy + 18, kilopounds per square inch (ksi) [fy+125, MPa]) on the actual yield strength (fy_actual) of the steel and require a minimum actual tensile strength (ft_actual) to actual yield strength (fy_actual) ratio of 1.25. These requirements can result in the required tensile strength of the reinforcing bar being significantly higher than the specified minimum tensile strength. The recommended performance standard and acceptance criteria for mechanical or welded splices and mechanically headed deformed bar systems in Regulatory Position 11 are therefore also intended to be consistent with acceptance standards for reinforcing bar in CC-2331.2. Regulatory Position 13 CC-5210: General [Concrete Construction Examination] The locations of all major embedments, such as plates, embedded piping penetration sleeves, major structural framings, and anchor bolts, need to be preplanned, identified on the construction drawings, and documented on field changes to the drawings. This would permit verification that embedments have been placed with