Theoretical investigation of reactor primary coolant pipe, welds and fittings. Technical report

A dynamic analytical model for a running axial crack in a cylindrical shell was developed and used to study the propagation of cracks due to a steady initial pressure and cracks arising during instantaneous pressurization. A thermal hydraulic two phase depressurization model which permits depressurization to occur by leakage through an axial crack was also developed to permit the study of axial running cracks subjected to the varying pressure caused by leakage. Stress intensity factors for surface cracks in pressurized and thermally shocked cylinders were also derived