At its regular meeting on the 27th, the Nuclear Regulatory Commission approved the draft report compiled by the TEPCO Fukushima Daiichi Nuclear Power Plant Accident Analysis Committee and decided to solicit opinions from the general public. It was pointed out that a large amount of radioactive material had adhered to the upper lids of the reactor containment vessels of Units 1 to 3, and the content required careful measures during decommissioning work. It will be officially summarized in March.

According to the draft report, about one-tenth of the total of about 70 Kyobecquerels of radioactive cesium in Units 1 to 3 at the time of the accident remained in the upper lid. The upper lid has a three-layer structure made of reinforced concrete, and it is possible that cesium may have adhered between the first and second sheets from the top.