SCHOTT Electrical Penetration Assemblies for Nuclear Power Plants
A penetration module for nuclear power plants mainly consists of:
Our hermetically sealed penetration modules have:
Our glass-to-metal sealed (GTMS) penetrations are used in Pressurized Water Reactors (PWR), High Temperature Reactors (HTR) - also known as Pebble Bed Reactors (PBR), Boiling Water Reactors (BWR) and Fast Breeder Reactors (FBR).
The glass preform, metal shell and conductor pins, made of nickel-iron or oxygen-free copper (low-ohmic), are assembled on a fixture. The complete assembly is heated to a temperature where the glass becomes free-flowing and fills the space between the main body and the conductor pin or bolt.
During the cooling process, the glass solidifies at its set point. Upon further cooling, the outer metal housing shrinks more than the sealing glass and the conductor (due to its higher coefficient of thermal expansion), leading to a compressive radial force onto the glass body. This leads to a very high hermeticity and tightness even under high temperature or gas pressure and thermal cyclic conditions.
Finally, corrosion-protective layers are deposited on the metal shell; whereas the nickel-iron conductor pins are plated with a gold layer.
The cable tails are connected to the pins by plugs, crimping or soldering and then insulated by shrinking sleeve and potting with elastomer to ensure the electrical function even during extreme environmental conditions (important during Loss of Coolant Accident, LOCA).
Stainless steel housings are mounted to the ends, providing mechanical protection and strain relief at the cable inlet. Junction boxes inside and outside containment give an additional protection for this electrical system. For receptacle modules, the connectors can be either provided cabled according to the customer’s requirements or can be finished on site.
Besides power and regular control/instrumentation penetrations we also produce coax and triax penetrations in single or double barrier version.
Features / Specifications
Forms of Supply and Product Packaging
We can deliver products in accordance to customers’ specifications and / or completely pre-assembled. The penetration assembly usually includes junction boxes, as well.
Our products are delivered in dust-safe, moisture-safe, impact-proof transportation boxes.
Our penetration modules are manufactured according to KTA 3403 or based upon IEEE317 (Standard for Electric Penetration Assemblies in Containment Structures for Nuclear Power Generating Stations).
For more information about our quality assurance process, please refer to this page.