Planned and implemented remedial measures to prevent IGSCC and to ensure safe plant operation with BWR piping systems made of stabilized austenitic steels

After intergranular stress corrosion cracking had been found in piping, made from stabilized austenitic stainless steel, carrying reactor water in German BWRs, remedial measures have been taken with regard to the refurbishing concepts, material considerations, water chemistry and optimized fabrication processes. By taking adequate remedial action the integrity of the pipes for long-term plant operation is ensured. In addition study programs are already under way to provide better knowledge on crack initiation and crack growth behavior.