Tepco Handout, May 30, 2013 (Summary translation of page 26 by Fukushima Diary): [...] the committee of experts suggested Tepco to fill the torus room with grout. [...] Tepco plans to conduct the feasibility study with United States Department of Energy this year. [...] They assume it takes 1.5 years to make planning, and 2 years to inject the grout material. [...] The committee points out the benefit of using grout is it doesn’t directly touch the molten fuel. However, it hasn’t been confirmed that the fractured molten fuel is not really in the torus rooms.
Department of Energy: Grouting—Grout is a promising option to stop water leakage that’s occurring between reactor and turbine buildings at Fukushima Daiichi’s reactor units, and could be a key step toward facilitating decommissioning of units 1-4. SRNL has extensive experience in grout development and also has operating experience with grouting components reactors and other facilities.
Reuters: The company may resort to pouring a cement-like material into the rectors’ suppression chambers to plug leaks it has not been able to locate, Suzuki said. “One approach we are considering is putting grout, like cement,” he said. “In other words, filling it in. That would block all the holes.”
See also: "Too many holes" in Fukushima reactors? May have to fill up suppression chambers with cement -Tepco
Published: May 31st, 2013 at 12:54 pm ET