Document: 10 CFR Part 50
Document ID: cfc9c7b0-bbcd-4774-97ce-900cbc760408
Document Type: cfr
Title: Codes and standards.
Source: 10 CFR Part 50
Source URL: https://www.ecfr.gov/current/title-10/part-50/section-50.55a
Revision Date: 
Chapter: 
Section ID: 50.55a
CFR Part: 50
CFR Title: 10

Content:
age. ( xxxiii ) Section XI condition: Risk-Informed allowable pressure. The use of Paragraph G-2216 in Appendix G in the 2011 Addenda and later editions and addenda of the ASME BPV Code, Section XI is prohibited. ( xxxiv ) Section XI condition: Nonmandatory Appendix U. ( A ) When using Nonmandatory Appendix U of the ASME BPV Code, Section XI, 2013 Edition through the 2019 Edition, the following conditions apply: ( 1 ) The repair or replacement activities temporarily deferred under the provisions of Nonmandatory Appendix U must be performed during the next scheduled refueling outage. ( 2 ) In lieu of the appendix referenced in paragraph U-S1-4.2.1(c) of Appendix U, an approved version of the ASME BPV Code Case N-513 must be used in accordance with the appropriate NRC regulatory guides, as incorporated by reference in paragraph (a)(3) of this section, at the time the case was incorporated into the licensee's program. ( B ) Use of Nonmandatory Appendix U, Supplement U-S1 of the ASME BPV Code, Section XI, 2021 Edition is prohibited. ( xxxv ) Section XI condition: Use of RT T0 in the K Ia and K Ic equations. ( A ) When using the 2013 Edition of the ASME BPV Code, Section XI, Appendix A, paragraph A-4200, if T 0 is available, then RT T0 may be used in place of RT NDT for applications using the K Ic equation and the associated K Ic curve, but not for applications using the K Ia equation and the associated K Ia curve. ( B ) When using the 2015 Edition of the ASME BPV Code, Section XI, Appendix A, paragraph A-4200 subparagraph (c) RT KIa shall be defined as RT KIa = T 0 + 90.267 exp(−0.003406T 0 ) for U.S. Customary Units. ( xxxvi ) Section XI condition: Fracture toughness of irradiated materials. When using the 2013 Edition through the latest edition incorporated by reference in paragraph (a)(1)(ii) of this section of the ASME BPV Code, Section XI, Appendix A paragraph A-4400, the licensee shall determine irradiated T 0 and the associated RT T0 as specified in the 2021