A Decade of CSNI Activities in the Area of Ageing of Nuclear Power Plant Concrete Structures

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The Committee on the Safety of Nuclear Installations (CSNI) Working Group on Integrity and Ageing of Components and Structures (WGIAGE) has as a general mandate to advance the current understanding of those aspects relevant to ensuring the integrity of structures, systems and components, to provide for guidance in choosing the optimal ways of dealing with challenges to the integrity of operating as well as new nuclear power plants, and to make use of an integrated approach to design, safety and plant life management.

The WGIAGE sub-group on concrete structures developed a medium- to long-term programme of work in the area of structural integrity and ageing of concrete structures. The programme included a series of workshops that address specific issues associated with ageing of concrete structures such as loss of pre-stress force in tendons of post-tensioned concrete structures, in-service inspection techniques for reinforced concrete structures, response of degraded structures, instrumentation and monitoring and repair methods including criteria for conditions assessment.

This report compiles and summarises conclusions derived from each of the workshops and includes recommendations on collection and recording of data and information obtained during nuclear power plant decommissioning.