The number of ageing nuclear power plants (NPPs) is increasing in NEA member countries. Accordingly, maintenance programmes, in-service inspection and testing of structures, systems and components important to safety have been implemented to ensure that levels of reliability and effectiveness remain in accordance with the design assumptions. This is often being done using an integrated ageing management strategy based on state-of-the-art technology.
Ageing effects, especially material degradation, have progressively been experienced worldwide since the start of nuclear power plant operation. Material degradation is expected to continue as plants age and operating licences are extended. It is clear that unanticipated and unmanaged structural degradation could result in significant loss of safety margins, undermining public confidence and straining the resources of both regulatory authorities and the operators.
For regulatory authorities, it is important to verify the adequacy of the ageing management methods applied by the licensees, based on reliable technical evidence. Degradation of cable insulation were selected as one of the focus areas of the of SCAP project (2006-2010) due to its implications for nuclear safety and its relevance for plant ageing assessment.
This report summarises the project results of the CADAK database project during the two three-year terms: First term: 2012 to 2014 and second term: 2015 to 2017.