Reliability and safety are core to nuclear reactor maintenance, and that’s exactly what you get with Preferred’s Recirculation Suction Nozzle Plug (N1). It is designed to provide a secure and repeatable seal of the recirculation suction nozzle for Boiling Water Reactors (BWRs), ensuring safe isolation during outages. With its precision fit, dual-seal design, and reliable seal, the N1 Plug is an essential tool for any nuclear facility that needs to perform maintenance on their Recirculation Pump or otherwise isolate their recirculation line for maintenance purposes. .

This plug is built to match the inner diameter of the reactor annulus and the inner diameter of the recirculation suction nozzle, ensuring a tight, leak-proof seal. Its dual-seal system consists of a primary static seal and a secondary inflatable seal, offering redundant isolation and the ability to accommodate variations in nozzle size or surface irregularities. The Preferred Engineering N1 Plug provides a consistent and dependable isolation barrier.

Made from polished stainless steel, the plug is designed for easy decontamination, reducing radiation exposure risks and simplifying handling after use. Installation is fast and efficient – it can be deployed from the refuel bridge in under two hours.

To support its use, Preferred Engineering provides a Test & Training Mockup, which allows operators to practice installation and test the plug before deploying it in the reactor. Additionally, a specialized hoist assembly ensures safe and precise maneuvering of the plug in the tight spaces between the reactor vessel and the annulus.

For nuclear facilities, the N1 Plug represents a smart investment in both safety and efficiency. Its proven reliability, repeatable installation, and robust sealing capabilities make it an ideal solution for outage recirculation line isolation and maintenance. When it comes to nuclear maintenance, the right tools make all the difference—and the N1 Plug delivers.