nuclear-news

The News That Matters about the Nuclear Industry Fukushima Chernobyl Mayak Three Mile Island Atomic Testing Radiation Isotope

Steel Pipes to be Driven into Thawed Parts of Frozen Earth Wall at TEPCO’s Fukushima Daiichi Nuclear Power Plant

December 6, 2021
On December 6, Tokyo Electric Power Company (TEPCO) began to drive steel pipes into the ground to stop the inflow of underground water into the thawed part of the frozen soil barrier wall (about 1.5 km long) built underground around the No. 1 to No. 4 reactors at the Fukushima Daiichi Nuclear Power Plant (Okuma and Futaba towns, Fukushima Prefecture). Over the course of about a week, eight steel pipes with a diameter of 35 centimeters and a maximum length of six meters will be driven into the outside of the wall, creating a wall about four meters wide. If the water is not stopped, additional steel plates will be driven into the wall.
 According to TEPCO, the frozen soil wall is believed to be thawing at the intersection of the southwest side of Unit 4 and the underground tunnel for drainage. The temperature of the ground has been above zero since mid-September, and it has been confirmed that it has reached more than 10 degrees Celsius.
 The frost wall has been in operation since 2017 to prevent the inflow of groundwater into the reactor building, where melted nuclear fuel (debris) remains from the accident, and to reduce the generation of contaminated water. About 1,600 freezing pipes (30 meters long) driven into the ground are circulated with cooling liquid at 30 degrees below zero to freeze the surrounding soil.
https://www.tokyo-np.co.jp/article/147155?rct=national&fbclid=IwAR30nXaBUALO9eC4RHZkaRsXHg3j01jRmWd0RBkk4oF53UDmROD0Dk3YGNg

December 6, 2021 Posted by | Fukushima 2021 | , , | Leave a comment

Part of the frozen soil barrier may have thawed at the Fukushima Daiichi Nuclear Power Plant. Steel pipes are being driven into the ground to stop groundwater flow.

Nov. 25, 2021
Tokyo Electric Power Company (TEPCO) announced on November 25 that it may have thawed part of the frozen soil barrier wall built around the No. 1 to No. 4 reactors at the Fukushima Daiichi Nuclear Power Plant (Okuma and Futaba towns, Fukushima Prefecture) to prevent the inflow of groundwater. The company has announced that it will try to stop the flow of water by driving several steel pipes into the wall. The project will start as early as early December, and if the temperature in the ground continues to rise, additional steel plates will be driven in.
 According to TEPCO, a thermometer installed in the ground at the intersection of the southwest side of Unit 4 and the underground tunnel for drainage confirmed that the temperature exceeded zero degrees Celsius in late August. Since late September, the temperature has sometimes been above 10 degrees Celsius. A spokesperson explained at a press conference that the groundwater level outside the wall was high, and water pressure may have created a water path.
 The steel pipe is 35 centimeters in diameter and up to six meters long. Nine of them will be driven into the ground outside the frozen soil wall, which may have thawed, to create a wall three to four meters wide.
 The freezing wall, which has been in operation since 2017, was built to prevent groundwater from flowing into the reactor building, where melted nuclear fuel (debris) remains from the accident, and to reduce the amount of contaminated water generated. The wall is about 1.5 kilometers long. About 1,600 freezing pipes (30 meters long) were driven into the ground. The freezing pipes are about 1,600 tubes (30 meters long) driven into the ground and circulated with a cooling liquid of 30 degrees Celsius to freeze the surrounding soil. (Kenta Onozawa)
https://www.tokyo-np.co.jp/article/144800

November 26, 2021 Posted by | Fukushima 2021 | , , | Leave a comment