Nuclear Industrial Directory of Japan

Nuclear Industrial Directory of Japan



Shinagawa Intercity Tower B, 2-15-2, Konan, Minato-ku, Tokyo 108-8502, Japan

Contact Person
Mr. Akira Shimizu

Corporate Information

With a history of more than 126 years, Obayashi Corporation is one of Japan’s largest general contractors. Centered on the Obayashi Corporation, the Obayashi Group comprises 89 subsidiaries and 28 affiliated companies with a total of approximately 14,000 employees and combined annual net sales of approximately ¥2,000 billion.
Obayashi also has an established record outside Japan, dating back to 1962 when it became the first Japanese general contractor to take on an overseas construction project. Since then, Obayashi has continued its business activities in the United States, playing a role in many high-profile large-scale projects, from the Central Artery/ Tunnel Project in Boston to the Colorado River Bridge at Hoover Dam. In addition to the United States, Obayashi has been involved in a number of global projects around the world, from the main stadium for the Sydney Olympics to Taiwan’s high-speed railway and the urban rail system in Dubai — a truly global business.

Main Activities

Our main scope of business is as follows:

  1. Contracting for construction work
  2. Regional, urban, marine environmental development and management, and other construction related business
  3. Engineering and management, including research and surveys, planning, design and supervision related to the two preceding items

In the field of nuclear energy, Obayashi provides engineering, construction and technical services for facilities such as nuclear power plants, reprocessing facilities, spent fuel interim storage facilities, and geological disposal facilities.

Major Technologies

1. Advanced Construction

Obayashi has an extensive modularization methodology developed through experience with construction of nuclear facilities; this is coupled to a highly-advanced computer-integrated system that incorporates information and construction management functions. Making full use of this advanced methodology, we can realize improvements in productivity and quality, with a corresponding reduction in costs as required in the construction of large-scale nuclear facilities.
Recently, we utilize building information modeling (BIM) in the building construction field and construction information modeling (CIM) in the heavy civil engineering field to construct computer-based models of buildings or infrastructure, as a visualization technique. The models integrate 3D form information as well as information on material and component specifications and attributes such as costs and finishing. Use of 3D models assists information sharing and mutual understanding between people involved in projects, and enables them to form a consensus quickly.

2. Pre-stressed Concrete Containment Vessels( PCCV)

Obayashi recognized the potential of PCCV at a very early stage, starting research in the 1960’s and constructing the first PCCV in Japan. At present, we are continuing to improve our technology in order to maintain our global position as the leading expert in PCCV.

3. Decommissioning Technology

Obayashi Corporation is actively promoting the development of all kind of technologies, including dismantling plan, demolition method, and reuse of dismantled waste, in order to implement measures for safe and efficient decommissioning. For example, we develop BIM based simulation techniques and rational shielding method for dismantling planning. Regarding dismantling of concrete, we are developing dry wire sawing method, dry long core drilling method, controlled blasting method etc. so that we can handle any field conditions.
Obayashi Corporation also focuses on the reuse technology of nonradiative concrete for reducing of environmental burden.

4. Waste Disposal Technology

Obayashi has a long history of global involvement in radioactive waste disposal projects. We participated in the WIPP construction project in USA, in 1982 and are now involved in a variety of waste disposal research projects worldwide, for example in the Grimsel and the Mont Terri rock laboratories in Switzerland. We provide a“ one-stop” service for all aspects of geological disposal, including site investigation, design, construction and safety assessment.