“Technical Guidelines for Watertight Facilities (JEAG4630)” was established in 2016 to provide common guidelines for nuclear power utilities. This technical guidance describes the basic processes of each stage, from design to in-service inspections in Japanese. The guidance considers the features of the equipment, the functions of which are difficult to inspect after installation. This guidance is formulated according to the requirements described in Chapter 4 of the “Technical Code for Tsunami Design of Nuclear Power Plants (JEAC4629-2014)”: “Design of Tsunami Protection and Flood Protection Facilities”.

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