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Recent development in advanced ISI-NDE for nuclear power plants

: Deuster, G.; Höller, P.

4th European Conference on Non-Destructive Testing '87. Proceedings. Vol.4
Oxford: Pergamon Press, 1988
European Conference on Non-Destructive Testing <4, 1987, London>
Fraunhofer IZFP ()
acoustic emission; acoustic holography; eddy current testing; in-service-inspection; reactor pressure vessel; SAFT; ultrasonic testing

The present situation in NDE in the nuclear industry in the Federal Republic of Germany can be described briefly as follows. To achieve basic safety of nuclear power plant components, requirements are established to assure satisfactory fabrication and testing conditions as well as a favourable stress curve under operating loads. Basic safety depends on: high-quality material charcteristics, in particular toughness; a conservative restriction of stress; prevention of stress peaks through optimal design; assurance of the application of optimized manufacturing and testing technologies; knowledge and assessment of possible faulty conditions; consideration of the operating fluid and temperature. If basic safety requirements are fulfilled, growth of residual fabrication defects or inhomogeneities for the lifetime of a nuclear powerplan plant is not expected. Under these circumstances non-destructive testing during fabrication and during operation is still a necessity, but its role has change d. Quality assurance during fabrication of components fulfilling requirements of basic safety needs high-level non-destructive testing. Inservice inspections are more redundant than they were before, but redundancies significantly contribute to safety and cannot be relinquished. Moreover, in-service inspection has to cover unexpected service-induced defects and unforseeable (on the present basis of knowledge and experience) initiation and/or growth of cracks.