RPV Integrity Assessment by Operational Feedback: Post Service Investigations of VVER-type NPPs

The investigation of RPV material from decommissioned NPPs offers the unique opportunity to evaluate the real toughness response. By investigation of material from the decommissioned VVER 440-type Greifswald NPP the evaluation of a standard RPV design and the assessment of the quality of prediction rules and assessment tools will be possible. First results of the investigations are presented in the paper.