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Mitsubishi Nuclear Energy Systems

Energy - Utilities - Gas - Electric
< 100 employees  |  

Mitsubishi Heavy Industries, Ltd. (MHI) is a diverse company that manufactures a range of products, including heavy machinery, ships, industrial equipment, wind turbines, aircraft engines and power plants, to name a few. We have over 32,000 employees worldwide, and had total sales of nearly $23 billion in fiscal 2006.

The motto of our company, “New Engineering Excellence,” is embodied in our products, based on leading-edge research into the technologies of the future. We go beyond merely refining existing technologies; instead, we integrate diverse technologies based on totally new concepts in pursuit of ever-more advanced solutions. We constantly challenge ourselves to create a better future.

Since the 1950’s, when Mitsubishi group first began to research and develop nuclear power generation, we have taken part in the design and construction of more than twenty nuclear power plants in Japan. We will continue to supply reliable products and services in the area of Pressurized Water Reactor (PWR) power plants, including:

  • Basic plans
  • Design
  • Manufacturing
  • Construction
  • Maintenance

To meet U.S. customers’ needs, MHI has established Mitsubishi Nuclear Energy Systems Inc. (MNES), headquartered in Washington, D.C. MHI, through MNES, will supply commercial industries with efficient, safe and economical nuclear products and services.


In 1970, Mitsubishi constructed the first nuclear power plant in Japan using Pressurized Water Reactor (PWR) technology – the Mihama Unit 1 of the Kansai Electric Power Co. For the past four decades, we have been improving PWR plants with our own operational experience as well as through extensive research and development. With this vast knowledge, we are now able to supply PWR plants with unparalleled levels of reliability, safety and output capacity to our utility customers. PWR technology is used by two thirds of the nuclear power plants now operating in the world. We are now planning our next generation plants, the Tsuruga 3 and Tsuruga 4, using Advanced PWR (APWR) technology. These are scheduled for operation by the Japan Atomic Power Company beginning in 2014. At over 1,500 megawatts output, they will have one of the highest capacities in the world. These units will be capable of producing 30% more total energy than a conventional 4-loop plant. The APWR design will also incorporate a high-performance core that loads MOX fuels and operates over longer cycles.

Our Creed

  • We strongly believe that the customer comes first and that we are obligated to be an innovative partner to society
  • We base our activities on honesty, harmony, and a clear distinction between public and private life.
  • We shall strive for innovative management and technological development from an international perspective.

In Japan, there are many enterprises with their own “creeds,” which simply represent their management concept. The creed at Mitsubishi Heavy Industries, Ltd. was instituted in 1970 to indicate the essential attitude of the company, the mental attitude of the employees and the future direction of the company. Our creed helps us call to mind our one hundred years of tradition, and makes us strive for further development in the future.

Our Services

Mitsubishi Heavy Industries, Ltd. (MHI) has over 35 years of experience building and maintaining nuclear power plants in Japan; servicing plants worldwide; and developing more efficient and reliable technologies through research. This track record of steady evolution in our knowledge of nuclear power generation has led to development of the U.S. Advanced Pressurized Water Reactor (US-APWR) for the global energy market

We are a fully-integrated nuclear power company, providing all facets of plant design, site selection, construction, fueling, operation and maintenance:


We use a seamless design information control system for all of our activities, from the initial planning/basic design (including license approval and safety evaluation) to manufacturing and inspection. The universal scope of the control database and the advanced computer technologies at its core assure reliability and high quality in all designs.


We continuously refine our factory automation technology using 3D-CAD data, applying the latest techniques such as laser beam welding and high-performance large-scale machining. High-quality nuclear products can be manufactured within short periods with the help of our technologies and strict quality-control systems.

Quality Assurance

This is the heart of our manufacturing system, using the latest examination techniques in combination with traditional craftsmanship. The result is an unrivalled reputation for producing the very best. Mitsubishi’s technologies and quality assurance promise customers satisfaction at a level they never expected.


Our extensive scheduling and quality controls assure that we construct the best possible plant in the minimum delivery time. Our advanced construction methods and our high-level control systems serve the customer from the early stages of planning and design right through to test operation.

Contact Us

Mitsubishi Nuclear Energy Systems, Inc.

For media inquiries, please contact

1700 K Street NW, Suite 440
Washington DC 20006, USA
Phone: 1-202-775-3933

Engineering Office
2300 Wilson Boulevard, Suite 300
Arlington, VA 22201-5426, USA
Phone: 1-703-908-8040
Fax : 1-703-908-8099

Nuclear Services
300 Oxford Drive, Suite 301
Monroeville, PA 15146, USA
Phone: 412-374-7395
Fax : 412-374-7377

Mitsubishi Heavy Industries, Ltd.


16-5 Konan 2-chome, Minata-ku
Tokyo, Japan
Phone: 81-3-6716-4835
Fax: 81-3-6716-5858