15 December A long-range timetable is announced for the decommissioning of the Fukushima Daiichi reactors. The plan is to repair the damaged containment vessels and determine the condition of the melted fuel by the end of 2021, then begin the retrieval of this fuel in 2022. The full duration of the schedule is 40 years, with the decommissioning work to be completed by 2052. Friday, 16 December In a joint statement by TEPCO and the Japan government it is announced that the reactors have achieved a state of cold shutdown. Temperatures in the containment vessels were 38.9 degrees Celsius for reactor one, 67.5 degrees for reactor two, and 57.4 degrees for reactor 3. This announcement failed to lay to rest substantial concerns arising from TEPCO's inability to directly measure temperatures at the bottoms of the containment vessels, and the fact that the site is too radioactive for visual confirmation of the fuel rods' status. Sunday, 18 December 230 tons of highly radioactive water are discovered in a tunnel below a building that stores contaminated water, raising questions about TEPCO's inspection and management capabilities. TEPCO admits that this radioactive water may be mixing with the ground water, yet claims that the tunnel is not connected to the sea. Tuesday, 20 December US Nuclear Regulatory Commission Chairman Gregory Jaczko, visiting Japan, confirmed that the Daiichi reactors were stable. Said Jaczko, "The temperatures have decreased significantly, the amount of heat that's being produced from the reactor fuel itself is very, very low now. So it simply doesn't have the kind of energy, if you will, that's needed to have any kind of off-site releases of radiation. I feel very comfortable with the (government's cold shutdown) decision." Monday, 26 December An interim report was issued by the investigative panel headed by Yotaro Hatamura. In the report, the panel concluded that poor internal communication by the Japanese government and faulty knowledge and actions by TEPCO employees contributed to the disaster. The Japanese cabinet was not informed of the government's System for Prediction of Environmental Emergency Dose Information, which could have told them of the wind direction's effect on the spread of radiation, which would have allowed them to make better decisions on which areas to evacuate around Fukushima Daiichi. TEPCO workers mistakenly believed that the isolation condenser for reactor No. 1 was still working, when it was not, delaying efforts to try other methods to