The Shaw Group Inc. announced Wednesday that a patent-pending water retrieval and recovery system is being used to remove cesium and other highly radioactive contaminants from basements and other buildings near the Fukushima Daiichi nuclear plant in Japan.

Shaw is performing the work through its Shaw Global Services LLC, which is under contract to help with the clean up.

After a massive tsunami and earthquake struck Japan in March, Shaw began providing water treatment, radiation monitoring and consulting services, said J.M. Bernhard Jr., company chairman, president and chief executive officer, in a news release.

“Our technical systems at the damaged Fukushima Daiichi nuclear power station were brought online very quickly and safely through the help of our subcontractors and already have demonstrated successful operations,” Bernhard said. “We are committed to this long-term effort and are ready to employ our critical resources, leadership and technical solutions for years to come.”