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 : 08 SEP 1970

Pagination or Media Count : 29

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