Document: NRC Regulatory Guide
Document ID: 5f4d6577-6c2a-473a-9a76-4033a95dba4c
Document Type: regulatory_guide
Title: Radiation Embrittlement of Reactor Vessel Materials (Rev. 2)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML0037/ML003740284.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.99
CFR Part: 
CFR Title: 

Content:
and Test Reactors 7. Transportation 3. Fuels and Materials Facllltles 8. Occupational Health 4. Environmental and Siting 9. Antitrust and Financial Review 5. Materials and Plant Protection 10. General Copies of Issued guides may be purchased from the Government Printing Office at the current GPO price. Information on current GPO prices may be obtained by contacting the Superlntendent·of Documents, U.S. Government Printing Office, Post Office Box 37082, Washington, DC 20013-7082, telephone (202)275-2060 or (202)275-2171. Issued guides may also be purchased from the National Technical Information Service on a standing order basis. Details on this service may be obtained by writing NTIS, 5285 P.ort Royal Road, Springfield, VA 22161. The two measures of radiation embrittlement used in this guide are obtained from the results of the Charpy V-notch impact test. Appendix G to 10 CFR Part 50 requires that a full curve of absorbed energy versus temperature be obtained through the ductile-to-brittle transition temperature region. The adjustment of the reference temperature, ARTNDT, is defined in Appendix Gas the tempera- ture shift in the Charpy curve for the irradiated material relative to that for the unirradiated material measured at the 30-foot-pound energy level, and the data that formed the basis for this guide were 30-foot-pound shift values. The second measure of radiation embrittlement is the decrease in the Charpy upper-shelf energy level, which is defined in ASTM E 185-82. This Revision 2 updates the calculative procedures for the adjustment of reference temperature; however, calculative procedures for the decrease in upper-shelf energy are unchanged because the preparatory work had not been completed in time to include them in this revision. The basis for Equation 2 for ARTNDT (in Regulatory Position 1.1 of this guide) is contained in publications by G. L. Guthrie (Ref. 2) and G. R. Odette et al. (Ref. 3). Both of these papers used surveillance data from