[en] Intermediate test vessel V-8, a 152-mm-thick vessel fabricated of SA 533, grade B, class 1 steel, was pressurized to failure at a test temperature of -23⁰C. The vessel contained a large fatigue-sharpened notch adjacent to a half-bead weld repair that had not been stress relieved. Residual stresses and fracture toughness were determined before the pressure test by measurements on a prototypic weld, and fracture predictions were made by linear elastic fracture mechanics. Predictions agreed well with results of the test, which demonstrated the important influence of high residual stresses on fracture behavior