Document: NRC Regulatory Guide
Document ID: 44b58049-ac63-457b-a075-ef162b34cb70
Document Type: regulatory_guide
Title: Materials code case Acceptability - - ASME Section III, Division 1 (Rev. 31)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740365.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.85
CFR Part: 
CFR Title: 

Content:
cation should specify impact testing for the ma terial. For these cases, it should be demonstrated by the applicant that (1) the impact test results for the material meet code requirements and (2) the material is not sub j ect to stress corrosion cracking by virtue of the fact that (a) a corrosive environment is not present and (b) the component that contains the material has essentially no residual stresses or assembly stresses, and it does not experience frequent sustained loads in service. 1644-7 11-21-77 Additional Materials for Com (N-71-7) 05-15-78 ponent Supports, Section III, Division 1, Subsection NF, Class 1, 2, 3 and MC Compo nent Supports Code Case 1644-7 was acceptable subject to the following conditions in addition to those specified in the Code Case: The maximum measured ultimate ten sile strength (UTS) of the component support material should not exceed 170 Ksi in view of the susceptibility of high-strength materials to brittleness and stress cor rosion cracking. Certain applications may exist where a UTS value of up to 190 Ksi could be considered accept able for a material and, under this condition, the Design Specification should specify impact testing for the ma terial. For these cases, it should be demonstrated by the applicant that (1) the impact test results for the material meet code requirements and (2) the material is not sub ject to stress corrosion cracking by virtue of the fact that (a) a corrosive environment is not present and (b) the component that contains the material has essentially no residual stresses or assembly stresses, and it does not experience frequent sustained loads in service. 1644-8 05-15-78 Additional Materials for Com (N-71-8) 01-07-80 ponent Supports, Section III, Division 1, Subsection NF, Class 1, 2, 3 and MC Compon ent Supports Code Case 1644-8 was acceptable subject to the following conditions in addition to those specified in the Code Case: The maximum measured ultimate ten sile strength (UTS) of the component