Document: NUREG-0800
Document ID: 0b23933f-b289-4641-9f98-1ba08c60372f
Document Type: srp
Title: REACTOR VESSEL MATERIALS
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070423.pdf
Revision Date: 2023-06
Chapter: 5
Section ID: 5.3.1
CFR Part: 
CFR Title: 

Content:
s performed on base material, weld metal, and heat-affected zones are reviewed, and the scope of the testing is checked, particularly in the area of the reactor vessel beltline region, where radiation effects on the material are most significant. Fracture toughness of the materials employed is characterized by its reference temperature, RT . This temperature is the higher value of the nil-ductility temperature NDT (NDT) from the dropweight test, or the temperature that is 33 C (60 F) below the 4 temperature at which Charpy V-notch impact test data meet a specified toughness level. 5.3.1-3 DRAFT Rev. 2 - April 1996 The information submitted is checked to ensure that the RT of the materials is NDT included with the data and test results for impact testing. 6. Material Surveillance Reactor vessel material surveillance must be performed to monitor changes in the fracture toughness properties of ferritic materials in the reactor vessel beltline region of water-cooled power reactors, resulting from exposure to neutron irradiation and the thermal environment. Under the surveillance programs, fracture toughness test data are obtained from material specimens withdrawn periodically from the reactor vessel. These data will permit the determination of the conditions under which the vessel can be operated with adequate margins of safety against fracture throughout its service life. 7. Reactor Vessel Fasteners The materials for the stud bolts, washers, and nuts, or other fasteners used to hold the reactor vessel head, are reviewed to determine their adequacy. Mechanical properties, including fracture toughness, are checked to ensure that all requirements are met. Lubricants or surface treatments used are reviewed to ensure that the studs will be resistant to stress-corrosion cracking under the environmental conditions during service and shutdowns. The adequacy of the destructive testing procedures used to ensure initial integrity is reviewed, along with the applicable acceptance