Document: NUREG-0800
Document ID: 339b5072-d5b1-47d7-9002-e7b942ab753b
Document Type: srp
Title: II.
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070311.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.1.3.8
CFR Part: 
CFR Title: 

Content:
assumption of nonlinear response (i.e., ductility ratios greater than unity) of the structural elements is generally acceptable, provided that the intended safety functions of the structural elements and those of safety-related systems and components supported or protected by the elements are maintained. The following summarizes specific positions for review and acceptance of ductility ratios for reinforced concrete and steel structural elements subjected to impactive and impulsive loads. II. SPECIFIC POSITIONS 1. Reinforced Concrete Members The technical position of the regulatory staff with regard to permissible ductility ratios is stated in Regulatory Guide 1.142. Prior to publication of Revision 1 of Regulatory Guide 1.142, the staff position regarding ductility will be provided to applicants on a case-by-case basis.50 2. Structural Steel Members a. For tension due to flexure µ < 10.0 d b. For columns with slenderness ratio (l/r) equal to or less than 20 µ < 1.3 d Where l = effective length of the member r = the least radius of gyration For columns with slenderness ratio greater than 20 µ < 1.0 d µd 0.5 eu ey 3.5.3-11 DRAFT Rev. 2 - April 1996 c. For members subjected to tension Where e = Ultimate strain u e = Yield strain y DRAFT Rev. 2 - April 1996 3.5.3-12 [This Page Intentionally Left Blank] SRP Draft Section 3.5.3 Attachment A - Proposed Changes in Order of Occurrence 3.5.3-13 DRAFT Rev. 2 - April 1996 Item numbers in the following table correspond to superscript numbers in the redline/strikeout copy of the draft SRP section. Item Source Description 1. Current primary review branch Changed PRB to Civil Engineering and Geosciences designation and abbreviation Branch (ECGB). 2. SRP-UDP format item Added "Review Interfaces" to REVIEW PROCEDURES. 3. Editorial modification Renumbered paragraph to conform to updated format of SRP sections. 4. Current review branch designation Changed review interface branch to Plant Systems and abbreviation Branch (SPLB). 5.