Electrical Penetration Assemblies (EPAs) transfer electrical power and signals through the containment wall and ensure the containment pressure boundary is maintained during design basis accident conditions. This dual function, as a safety-related electrical and mechanical device, makes the EPA an unique nuclear component.
EPAs are configured with individual feedthrough modules that are mounted to a bulkhead flange, header plate, or canister. Feedthrough modules are constructed with electrical conductors to pass electrical signals or power, insulators, and seals in a stainless steel housing. Feedthrough modules and the bulkhead flange aperture are supplied with double redundant seals and internal nitrogen gas containment space for leakage monitoring.
Applications
- Annunciator Panels
- Fire Protection Panels
- Sampling Panels
- Electrical Control Panels
- Instrument Panels
- HVAC Control Panels
- Custom Cabinets and Racks
- Electrical Distribution Panels
- Process Flow/Control Panels
Design Features
- Feedthrough modules with integral lead wires
- Flanges, canisters, or header plates Junction Boxes (both inboard and outboard)
- N2 pressure gauge and shut off valve
Qualification Levels
- Qualified life: 60 years
- Thermal Aging
- Radiation
- Seismic
- Thermal Cycling
- High Current Testing
- LOCA/MSLB
- Flooding and Severe Accident
Qualification Standards
- ASME NPT Certification
- IEEE 317-1983/2013
- IEEE 323-1974/1983/2003
- IEEE 344-1975/1987/2004
- KBE EP-146
- KBE EP-154
- Equivalent to RCC-E, K1
- 10CFR50/Appendix B
- 10CFR21
- NQA-1
- ISO 9001