[en] Intergranular stress corrosion cracking susceptibility of surface finished type 304 and 304L stainless steel has been studied in 288/degree/C water containing 26 ppm dissolved oxygen to define conditions to prevent IGSCC in piping used in a boiling water reactor (BWR). Susceptibility of type 304 increased by surface finishing, such as grinding, when in a sensitized condition. Increasing surface roughness shortened the time to failure. Specimens which are solution heat treated do not show susceptibility even if ground. Type 304L stainless steels do not show susceptibility even if ground and sensitized at 621/degree/C for 2 h. 8 refs