Procedure and method of Equipment Qualification(EQ) for EPA in NPP

The Electric Penetration Assemblies(EPAs) for NPP are usually used for medium voltage power, low voltage power, low voltage control and instrumentation. Field cables either interface with the EPAs using electrical connectors or are terminated to penetration lead wires using splices or terminal blocks. These EPAs provide two critical and distinct functions, which are the electrical continuity, insulation and the containment pressure integrity. EPAs insulation resistance or impedance characteristics may be critical in instrument applications. The following design shows a typical modular unit design. In this paper, we analyze the codes and procedures of the equipment qualification test and propose test items, conditions, and acceptance criteria more specifically