Various microstructures of Alloy 690 and its weld metalas and types of cold work were tested in representative pressurized water reactor primary water at 290 to 360 °C. Intergranular cracking was observed on Alloy 690 at constant stress intensity factor (no cycling) and with “gentle” cyclic loading but not in every case. Crack growth rates in some tests were in the range of 1 to 10 x 10–9 mm/s but growth rates as high as 1.4 x 10–8 mm/s were observed in Alloy 690 with microstructural banding and 1-dimension cold rolling tested in the S-L orientation which aligns the planes of banding rolling and cracking.