Steel containment for nuclear reactors. Pt. 4

The standard is valid for in-service inspections of steel containments for stationary LWRs including those airlocks, construction and transport openings, pipe and cable penetrations which are firmly connected with the containment as well as isolating devices of piping which have an open end in the containment atmosphere and serve for containment isolation. The standard is also valid for containment with a pressure suppression system and an external liner. It is to be applied to all in-service inspections following first criticality, including the first repetition of the integral leak rate test (preoperational leak rate test). The aim of the standard is to fix the extend and the intervals for the in-service inspections performed on the containment and its components in order to test its integrity and performance. (orig.)