Document: NUREG-0800
Document ID: d4acff25-51e1-4891-b590-9ad78ef4833e
Document Type: srp
Title: REACTOR VESSEL MATERIALS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0523/ML052340633.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.3.1
CFR Part: 
CFR Title: 

Content:
l,." and 1.37, "Quality Assurance Requirements for Cleaning of Fluid Systems and Associated Components of Water-Cooled Nuclear Power Plants," provide the acceptance criteria to avoid sensitization and contamination of stainless steel. The referenced regulatory guides are described in detail in the acceptance criteria of SRP Section 5.2.3, which is reviewed by MTEB. 5. Fracture Toughness The acceptance criteria for this area of review are the requirements of Appendix G of 10 CFR Part 50. These criteria satisfy the requirements of GDC 31 and § 50.55a(i) regarding materials testing and acceptance standards for fracture toughness. Appendix G requires that the reactor vessel and appurtenances thereto which are made of ferritic materials shall meet the following minimum requirements for fracture toughness during system hydrostatic tests, during conditions of normal operation, and during anticipated operational occurrences: a. The ferritic materials shall be tested in accordance with the ASME Code section NB-2300 including: 5.3.1-5 Rev. 1 - July 1981 (1) TNDT shall be determined for each material by means of a drop- weight test. | (2) The materials shall meet the acceptance standards of paragraph NB-2330 of the Code, which states that at a temperature not greater than (TNDT + 60?F) each Charpy Cv specimen tested shall exhibit at least 35 mils lateral expansion and not less than 50 ft-lbs of absorbed energy. (3) When these requirements are met, TNDT is defined as the reference temperature, RTNDT. In the event .that the above requirements are not met, additional Cv notch impact tests are performed (in groups of three specimens) to determine the temperature Tcv at l which they are met. In this case the reference temperature RTNDT = Tcv - 60?F. Thus the reference temperature RTNDT is the higher of TNOT and (Tcv - 60?F). (4) When a Cv impact test has not been performed at (TNDT + 60?F), or when the Cv impact test at (TNDT + 60'F) does not exhibit a minimum of 50 ft-lbs and 35