20.08.2015   Design of Reactor Containment Systems for Nuclear Power Plants

Piping penetrations

4.185. In the mechanical design of piping penetrations, including isolation valves, the loads originating from the piping system as well as loads originating from the containment should be taken into account. Special attention should be paid to complex features like metallic bellows. For these solutions, means such as nozzles or double seals should be used to test the leaktightness of piping penetrations individually.

4.186. Piping penetrations should be accessible so that leaks from individual penetrations can be detected in the leaktightness tests.