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In United States and German licensing rules according to American Society of Mechanical Engineers (ASME) Code and KTA-Regel for safety against brittle fracture of light-water reactor (LWR) pressure vessel steels, the nil ductility transition temperature plays an important role. It is based on the drop-weight test after Pellini. Together with the results from the Charpy test, the nil ductility transition (NDT) temperature is used to determine the reference temperature
Numerous tests with Charpy and drop-weight specimens irradiated at the GKSS-Research Center have shown that the measured
Because the crack-arrest load is a function of the proportion of cleavage in the broken Charpy specimen (fast running crack length in the load-deflection curve), it could be shown, that the NDT temperature in the drop-weight test can be correlated with that temperature, where the portion of cleavage in the Charpy fracture surface has a value of about two thirds of the broken area
irradiation, pressure vessel steels, irradiation effects, Charpy V-notch, impact properties, drop-weight tests, ductile transition, brittle transition
Schmitt, Franz J.
Senior research metallurgist, GKSS-Forschungszentrum, Geesthacht,