Document: NRC Regulatory Guide
Document ID: a1541707-8144-409c-8842-4ea7d4b8ef4e
Document Type: regulatory_guide
Title: 10/2019 (Rev. 19)
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML1912/ML19128A244.pdf
Revision Date: 2023-06
Chapter: 
Section ID: RG-1.147
CFR Part: 
CFR Title: 

Content:
ent exceeds 25 percent. 2/15E N-843 Alternative Pressure Testing Requirements Following Repairs or Replacements for Class 1 Piping between the First and Second Inspection Isolation Valves, Section XI, Division 1 If the portions of the system that requires pressure testing are associated with more than one safety function, the pressure test and visual examination VT-2 shall be performed during a test conducted at the higher of the operating pressures for the respective system safety functions. 4/13E N-849 In-situ VT-3 Examination of Removable Core Support Structures Without Removal, Section XI (1) The use of Code Case N-849 is limited to plants that are designed with accessible core support structures to allow for in situ inspection. (2) Before the initial plant startup, a VT-3 examination shall be performed with the core support structure removed, as required by ASME Section XI, IWB-2500-1, and shall include all surfaces that are accessible when the core support structure is removed, including all load bearing and contact surfaces. 7/13E RG 1.147, Rev. 19, Page 21 3. Annulled Unconditionally Approved Section XI Code Cases The NRC had previously approved the Code Cases listed in Table 3 unconditionally; however, they have been annulled by ASME. Table 3. Annulled Unconditionally Approved Section XI Code Cases CODE CASE NUMBER TABLE 3 ANNULLED UNCONDITIONALLY APPROVED SECTION XI CODE CASES ANNULMENT DATE N-34 (1551) Inservice Inspection of Welds of Nuclear Components, Section XI 11/20/81 N-72 (1646) Partial Postponement of Category B-C Examination for Class 1 Components, Section XI 1/1/81 N-73 (1647) Partial Postponement of Category B-D Examination for Class 1 Components, Section XI 1/1/81 N-98 (1705-1) Ultrasonic Examination—Calibration Block Tolerances, Section XI, Division 1 8/9/96 N-112 (1730) Acceptance Standards for Class 2 and 3 Components, Section XI, Division 1 7/1/79 N-113-1 Basic Calibration Block for Ultrasonic Examination of Weld 10 in. to 14 in. Thick,