Document: NUREG-0800
Document ID: a1ba9094-2225-4b8b-aadf-92e70968c29a
Document Type: srp
Title: REACTOR VESSEL INTEGRITY
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070432.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.3.3
CFR Part: 
CFR Title: 

Content:
the special considerations relating to fracture toughness and radiation effects effectively limit the basic materials that are currently acceptable for most parts of reactor vessels to SA 533 Gr B C1 1, SA 508 C1 2, and SA 508 C1 3. Acceptability criteria for other grades will have to be developed before they can be used. The relationships among material compositions, expected neutron fluence, and requirements for the material surveillance program must be compatible. The reviewer uses published data to ensure that the predicted shift in toughness properties (RT and NDT upper shelf energy) is conservative, based on actual material composition and predicted fluence. The predicted shift in toughness properties must be at least as conservative as that obtained by use of Regulatory Guide 1.99, "Effects of Residual Elements on Predicted Radiation Damage to Reactor Vessel Materials." Acceptability of the 23 material surveillance program, as specified in Appendix H, "Reactor Vessel Material Surveillance Program Requirements," of 10 CFR Part 50, depends on these relationships. 3. Fabrication Methods Acceptance criteria for the basic fabrication processes and their qualification and control requirements, and the regulations satisfied by these criteria, are detailed in SRP Section 5.3.1. These criteria are given in Sections III and IX of the Code. Although a particular fabrication process (such as multiple wire-high heat input welding) may be generally acceptable, it may not be suitable for reactor vessel fabrication for some materials without further justification or qualification. The reviewer uses "state-of-the-art" criteria and past practice to evaluate the acceptability of materials process combinations. Because fabrication methods, materials, and the effectiveness of nondestructive evaluation methods are interrelated, the reviewer must rely on state-of-the-art knowledge 5.3.3-5 DRAFT Rev. 2 - April 1996 and past practice to determine whether the proposed combinations