Abstract
The burst behaviour of fourteen vessels containing longitudinal flaws was investigated. The vessels were made of the two steels: 20 MnMoNi 5 5 with a high upper shelf impact toughness and a special melt of 22 NiMoCr 3 7 with a low upper-shelf impact toughness. The dimensions of the vessels were the same as of the pipes of the primary coolant system (798 O.D. × 47.5 mm wall thickness) of a pressurized water reactor. The test pressure and temperature correspond with the real service conditions of a PWR. Using a highly sophisticated measuring equipment, the time-history of pressure, crack opening and crack-opening area were determined experimentally.
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