Document: NUREG-0800
Document ID: 6cdd237d-c5b3-4a09-8753-54cfe1fea503
Document Type: srp
Title: REACTOR VESSEL MATERIALS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0631/ML063190007.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.3.1
CFR Part: 
CFR Title: 

Content:
reactor vessel and appurtenances thereto which are made of ferritic materials shall meet the following minimum requirements for fracture toughness during system hydrostatic tests, conditions of normal operation, and anticipated operational occurrences: A. The ferritic materials shall be tested in accordance with the ASME Code paragraph NB-2300 including: i. TNDT shall be determined for each material by means of a drop weight test. ii. The materials shall meet the acceptance standards of paragraph NB-2330 of the Code, which states that at a temperature not greater than (TNDT + 33EC)[(TNDT + 60EF)] each Charpy Cv specimen tested shall exhibit at least 0.89 mm (35 mils) lateral expansion and not less than 68 J (50 ft-lbs) of absorbed energy. When these requirements are met, TNDT is defined as the reference temperature, RTNDT. Revision 2 - March 2007 5.3.1-8 iii. 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 which they are met. In this case the reference temperature RTNDT = Tcv - 33EC (RTNDT = Tcv- 60EF). Thus the reference temperature RTNDT is the higher of TNDT and (Tcv - 33EC) [(Tcv - 60EF)] iv. When a Cv impact test has not been performed at (TNDT + 33EC) [(TNDT + 60EF)], or when the Cv impact test at (TNDT + 33EC) [(TNDT + 60EF)] does not exhibit a minimum of 68 J (50 ft-lbs) and 0.89 mm (35 mils) lateral expansion, a temperature representing a minimum of 68 J (50 ft-lbs) and 0.89 mm (35 mils) lateral expansion may be obtained from a full Cv impact curve developed from the minimum data points of all the Cv impact tests performed. B. In addition to the above criteria, the requirements of paragraphs IV.A.1, IV.A.2, and IV.B of Appendix G of 10 CFR Part 50 and 10 CFR 50.61(b)(2) (for PWRs) shall be met. i. SRP Section 5.3.2 discusses the requirements of paragraphs IV.A.2 and of Appendix G in detail. ii. The acceptance criteria discussed in