- Toshiba 4S
The Toshiba 4S (Super Safe, Small and Simple) is a “nuclear battery” reactor design. It requires only minimal staffing.
The plant design is offered by a partnership that includes
Toshiba and theCentral Research Institute of Electric Power Industry (CRIEPI) of Japan. [ [http://criepi.denken.or.jp/en/index.html Central Research Institute of Electric Power Industry ] ]The technical specifications of the 4S reactor are unique in the
nuclear industry . The actual reactor would be located in sealed, cylindrical vault 30 m (98 ft) underground, while the building above ground would be 22 x 16 x 11 m (72 × 52.5 x 36 ft) in size. This power plant is designed to provide 10Megawatt s of power.The 4S uses
neutron reflector panels around the perimeter to maintainneutron density. These reflector panels replace complicated control rods, yet keep the ability to shut down the nuclear reaction in case of an emergency. Additionally, the Toshiba 4S utilizes liquid sodium as a coolant, allowing the reactor to operate 200 degrees hotter than if it used water. This means that the reactor is depressurized, as water at this temperature would run at thousands of pounds per square inch.The reactor is expected to provide electric energy for between 5 and 13 cents/kWh, factoring in only operating costs. On paper, it has been determined that the reactor could run for 30 years without being refueled.
The Toshiba 4S Nuclear Battery is being proposed as the power source for the
Galena Nuclear Power Plant in Galena, Alaska.External links
* [http://www.atomicinsights.com/AI_03-20-05.html Atomic Insights article] information about the reactor, its specifications, and engineering aspects and challenges.
* [http://www.roe.com/about_techGalena.htm] Technical details about the 4S planned for Galena, Alaska.References
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