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Mitsubishi Nuclear Energy Systems

Mitsubishi Nuclear Energy Systems, or MNES, is a designer of America’s next generation of clean air nuclear energy generating stations and is an emerging leader in nuclear energy services.

MNES was established in 2006 by Mitsubishi Heavy Industries, Ltd. (MHI), as the supplier for Mitsubishi nuclear technologies in the United States. From its headquarters in Charlotte, North Carolina, MNES is leading the way for safer and more reliable nuclear energy.


The US Advanced Pressurized Water Reactor

Our design philosophy is “safety-first”, and that philosophy is reflected in all of our operations and designs. Nowhere is our commitment to safety clearer than in our reactor design, the US-Advanced Pressurized Water Reactor (US-APWR). The US-APWR incorporates the principles that were built into Mitsubishi’s twenty-four pressurized water reactors (PWRs) in Japan, which have operated safely for the past 40 years. The US-APWR also institutes new levels of safety and security by incorporating decades of nuclear operating experience and state-of-the-art safety systems.

The US-APWR achieves this new level of safety by incorporating a hybrid design that combines independent active safety systems with passive safety systems. These systems are state-of-the-art, each system is built upon nuclear industry principles of defense-in-depth, fail-safe operation, and backup redundancies.

As an example, the US-APWR’s backup power is provided by six independent, air-cooled gas turbines. These gas turbines are more reliable than traditional diesel generators, boasting a quicker start-up and air-cooling, with no need for water as coolant. By only requiring air-cooling the turbines can operate in isolation within their seismic category 1, water-tight housing.

The US-APWR also has a larger battery bank than existing reactors, allowing the plant to operate much longer without power. And, like our gas turbines, these batteries are protected from seismic damage and water damage by 21st century construction techniques.

The US-APWR can provide 1700 megawatts of electricity from a single plant, providing clean, reliable energy to hundreds of thousands of American homes.


Services & Technologies

MNES is also excited to bring some of the most advanced services technologies and components to the United States for use in operating nuclear stations and future facilities.

For instance, the MNES water-jet peening (WJP) process provides pressure treatment to reactor vessels, and ensures a stronger, more reliable reactor vessel. This process of peening high-pressure water against the vessel provides excellent preventive care by placing the surface of the reactor vessel into high compression, preventing stress corrosion and cracking.

If you’d like to know more about Mitsubishi’s global nuclear business or MHI’s full range of products and services please select one of the following links: