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Home > CSR > Past Highlight > 2. Support for recovery from the Great East Japan Earthquake > Ensuring the safety of Fukushima Daiichi Nuclear Power Station

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Support for recovery from the Great East Japan Earthquake Ensuring the safety of Fukushima Daiichi Nuclear Power Station

Toshiba is continuing to provide cooperation and support in maintaining the stability of the power station and advancing its decommissioning.

Cooperation and support to ensure the safety of Fukushima Daiichi Nuclear Power Station

Since immediately after the accident at the Fukushima Daiichi Nuclear Power Station, Toshiba Group has been working to the best of its ability to eliminate the consequences and ensure safety in response to a request by the government and the Tokyo Electric Power Company, Incorporated (TEPCO).
As a company engaged in nuclear power generation, we take the accident very seriously and have remained united in our resolve to overcome every difficulty.

Preventing the release and discharge of radioactive materials
Actions for step 1 (occurrence of the earthquake to July 2011)

In April 2011, the government and TEPCO developed a preliminary roadmap consisting of three steps for termination of the accident.
In step 1, where we effectively reduced the high radiation dose rate, Toshiba Group worked to prevent the nuclear-contaminated cooling water injected into the damaged plants from flowing out into the ocean. Under harsh work conditions with blackouts and high levels of radiation, we built and began operating a circulation cooling system designed to purify and recycle contaminated water in order to cool the reactor core within the short period of two months. As a result, we were able to control the increase in contaminated water, preventing it from flowing outside the power plant premises.

Achieving a stable state of cold shutdown
Working toward step 2 (August to December 2011)

A contaminated water treatment system developed by an overseas manufacturer was initially installed to deal with the emergency. The operation of this system led Toshiba to conclude that in order to process the massive amounts of contaminated water, it was necessary to improve the system's treatment capabilities and ensure its stable operation. Consequently, we proposed to TEPCO that we develop a new system in cooperation with partner companies in the United States and Japan. We commenced development in May and began operating the new system in August.
The new system, which we named SARRY™,*1 was highly valued for its stable operational performance and high decontamination ability, and came to be used as the primary decontamination device from October onward. The stable operation of SARRY allowed us to effectively cool the nuclear reactors through the circulation cooling system, and to help achieve a state of cold shutdown for the Fukushima Daiichi Nuclear Power Station's Units 1 through 3 in December.

*1 SARRY™:Simplified Active Water Retrieve and Recovery System

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Decommissioning initiatives in FY2012

Toshiba developed quadruped robots to perform investigations and recovery work in places unapproachable by humans and then actually deployed these robots to worksites at the power station. In addition to SARRY™, the contaminated water treatment system currently in operation, we developed and installed Multiple Radio-nuclides Removal System (MRRS), which reduces the concentration of radioactive substances being treated to a level such that the environment is not affected. At the same time, outside the nuclear power station, Gammasight™, which is a gamma camera capable of rendering radiation levels visible, continues to be used effectively in decontamination work.

Quadruped robot
Quadruped robot

Adsorption tower of MRRS™ (Multiple Radio-nuclides Removal System) in the environs of Toshiba’s Keihin Product Operations
Adsorption tower of Multiple Radio-nuclides Removal System (MRRS) in the environs of Toshiba’s Keihin Product Operations

Whole view of MRRS™ (Multiple Radio-nuclides Removal System) (from TEPCO’s website)
Whole view of Multiple Radio-nuclides Removal System (MRRS) (from TEPCO’s website)

Gammasight™ a high-performance, small-size portable gamma camera capable of rendering the effects of radiation visible

Gammasight™
Gammasight™

Smaller in size and higher in performance than gamma cameras used in the power plant, this portable gamma camera renders the distribution of radiation effects, which are difficult to identify using ordinary dose rate meters alone, visible using different colors, thereby allowing decontamination to be performed effectively and efficiently as well as contributing to ensuring the safety and security of local residents.

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