Abstract
Finland has four nuclear reactors units in two power plants. The first unit started operation in 1977 and in the early 1980's all four units were in use. During the last few years the aging management of the Nuclear Power Plant's (NPP) concrete structures has grown an important issue because the existing structures are reaching the end of their licensed operating lifetime (about 40 years). Therefore the nuclear power companies are developing aging management systems to avoid premature degradation of NPP facilities and to be able to extend their operating lifetime. This paper is about the development of a computerized ageing management system for the nuclear power plants concrete structures. The computerized ageing management system is built upon central database and implementation applications. It will assist the personnel of power companies to implement the aging management activities at different phases of the lifetime of a power plant. It will provide systematic methods for planning, surveillance, inspection, monitoring, condition assessment, maintenance and repair of structures.
Highlights
Basic idea of the computerized ageing management systemIn context with applying an extension to a plant operating license it is especially important for the applicant to know the current condition state of concrete structures
Finland has four nuclear reactors units in two power plants
During the last few years the aging management of the Nuclear Power Plant's (NPP) concrete structures has grown an important issue because the existing structures are reaching the end of their licensed operating lifetime
Summary
In context with applying an extension to a plant operating license it is especially important for the applicant to know the current condition state of concrete structures. The computerized ageing management system provides access to the structural, material and environmental information and to various design applications with appropriate methodologies and optimisation processes, which are required for the designers and maintainers of a nuclear power plant. It will provide the basis for planning, surveillance, quality management, inspection, monitoring, condition assessment, maintenance and repair of structures. The basic idea of the computer aided IAEA ageing management system is shown in schematically Fig. 1
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