Document: NUREG-0800
Document ID: c9c204f0-a162-491c-8c25-ee0418212f29
Document Type: srp
Title: PRESSURE-TEMPERATURE LIMITS, UPPER-SHELF ENERGY, AND PRESSURIZED
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0703/ML070380185.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.3.2
CFR Part: 
CFR Title: 

Content:
to address specific modes of operation. These nonbeltline curves are normally submitted to provide additional operational/testing flexibility and are generally less restrictive than the corresponding beltline curve. The development of these curves necessitates the evaluation of complex geometries where discontinuities are present. No simple review procedure can be specified for the review of such curves. However, the reviewer may use the guidance provided in Appendix G to Section XI of the ASME Code and Welding Research Council Bulletin 175 for such situations. B. Upper-Shelf Energy. The reviewer will evaluate the initial Charpy USE values for the reactor vessel materials in accordance with the acceptance criterion specified in paragraph IV.A.1.a of Appendix G to 10 CFR Part 50. Reactor vessel materials that do not meet the specified initial Charpy USE acceptance criterion shall be evaluated in accordance with the provisions for additional analysis also specified in paragraph IV.A.1.a. In addition to the ASME Code, Regulatory Guide 1.161 provides an acceptable methodology for the performance of analyses intended to meet the provisions for the additional analysis in paragraph IV.A.1.a. The reviewer will also evaluate the end-of-license (EOL) Charpy USE values for the reactor vessel materials in accordance with the acceptance criterion specified in paragraph IV.A.1.a of Appendix G to 10 CFR Part 50. Regulatory Guide 1.99 provides guidance on evaluating Charpy USE drop and, hence, USE values. Reactor vessel materials that do not meet the projected EOL Charpy USE minimum 68 J (50 ft-lb) criterion shall be evaluated in accordance with the provisions for additional analysis also specified in paragraph IV.A.1.a. In accordance with paragraph IV.A.1.c., this analysis must be submitted to the staff for review and approval on an individual case basis at least 3 years prior the date on which the predicted Charpy USE will no longer satisfy the requirements of paragraph