Accession Number:

AD0711845

Title:

A REASSESSMENT OF FRACTURE-SAFE OPERATING CRITERIA FOR REACTOR VESSEL STEELS BASED ON CHARPY-V PERFORMANCE.

Descriptive Note:

Special interpretative rept.,

Corporate Author:

NAVAL RESEARCH LAB WASHINGTON D C

Personal Author(s):

• Loss,F. J.
• Hawthorne,J. R.
• Serpan,C. Z. , Jr

Report Date:

1970-09-08

Pagination or Media Count:

29.0

Abstract:

Fracture-safe operating criteria for commerical nuclear pressure vessels based on Fracture Analysis Diagram procedures and Charpy-V energy trends are reappraised with respect to the effects of thick-section mechanical constraint and low Charpy-V shelf energies resulting from neutron irradiation. Comparisons of the Charpy-V test with the more definitive Dynamic Tear test procedures indicate the former to be an acceptable means of assessing the fracture toughness of A533-B steel. The mechanical constraint associated with 12-in. thicknesses of this steel suggests the addition of 70F 39C to the existing criterion requiring vessel operation above NDT 60F 33C. Ratio Analysis Diagram procedures are shown to be useful in interpreting Charpy-V shelf level data obtained from vessel surveillance programs in terms of critical toughness levels relating to brittle fracture. Author

Descriptors:

• (*STEEL
• FRACTURE(MECHANICS))
• (*PRESSURE VESSELS
• NUCLEAR REACTORS)
• SAFETY
• TESTS
• TRANSITION TEMPERATURE
• DESIGN

Subject Categories:

• Metallurgy and Metallography
• Fission Reactor Materials

Distribution Statement:

APPROVED FOR PUBLIC RELEASE