An approach of ensuring the quality of piping of NPP’s on the Czech Republic is described, with focus on high energy piping systems. Basic principles of this approach are described that are aimed to ensure the safety goals while maintaining the effectiveness of NPP operation during its long-term life. This approach ensures defense in depth of the piping. Its application on the high energy piping on +28.8 m level of WWER 1000 type NPP is demonstrated.

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