Investigation of WWER RPV steel and cladding from Greifswald NPP

The investigation of the well documented different irradiation/annealing states of the four former NPP Greifswald units are a special advantage to assess the reactor pressure vessel integrity and to check the corresponding rules and codes.
The results of new, more accurate calculations of the neutron fluence will be given. Further, the change of the RPV dismantling strategy required a new approach for the trepanning procedure. The new procedure will be shortly described and the cold test results of the new developed drilling machine are shown. Finally some aspects of the material investigation program are discussed.