Plugs, Covers, Seals

Preferred Engineering types of plugs, covers, and seals are well respected in the nuclear industry. The demands in today's shorter outages often require a more creative approach. The incentive for use of a plug varies with the circumstances, and we can assist in evaluating your specific conditions. Our ability to customize plugs, covers, and seals has been a staple of our company since its 1980 founding.

  • Custom Covers

    The Preferred Engineering Covers are constructed from polished stainless steel for easy decontamination, and offers a unique design which includes our Quick-Lock© Toggle Bolt System.


  • Custom Seals

    Preferred Engineering has a long history of designing and manufacturing custom seals for generating stations. We focus on cost effective, easily installed seals with a long operational life.


  • Stud Hole Plug Set

    The Stud Hole Plugs are machined from UHWM plastic and are designed to ‘rest’ on the top thread and seal on counter bore walls.


  • Valve Housekeeping Plug

    The specialized Valve Housekeeping Plug was developed by Preferred Engineering to prevent water from interfering with welding operations.


  • Cavity Seal System

    Consisting of segmented EPDM extrusions, these seals are custom made for each plant’s reactor annulus.


  • Fuel Transfer Tube Closure System

    Specifically designed to cut Critical Path time and reduce Dose, the FTTCS is a stainless steel assembly that allows remote sealing of the Fuel Transfer Tube.


  • Fuel Pool Plugs

    The Preferred Engineering Fuel Pool Plugs are stainless steel weldments designed to seal openings in the Spent Fuel Pool during maintenance.


  • Loop Plugs

    Hot/Cold Leg Loop Plugs are designed for reliable nozzle isolation and minimal protrusion from the vessel wall.