The News That Matters about the Nuclear Industry

Experts: Fukushima Must Do More to Reduce Radioactive Water

March 7, 2018
By MARI YAMAGUCHI, Associated Press
A group of experts has concluded that a costly underground ice wall is only partially effective in reducing the ever-growing amount of contaminated water at Japan’s destroyed Fukushima nuclear plant, and that other measures are needed as well.
In this Nov. 12, 2014, file photo, workers wearing protective gears stand outside Fukushima Dai-ichi nuclear power plant’s reactor in Okuma, Fukushima prefecture, northeastern Japan.
A government-commissioned group of experts concluded Wednesday, March 7, 2018 that a costly underground ice wall is only partially effective in reducing the ever-growing amount of contaminated water at Japan’s destroyed Fukushima nuclear plant, and that other measures are needed as well.
TOKYO (AP) — A government-commissioned group of experts concluded Wednesday that a costly underground ice wall is only partially effective in reducing the ever-growing amount of contaminated water at Japan’s destroyed Fukushima nuclear plant, and that other measures are needed as well.
The plant’s operator, Tokyo Electric Power Co., says the ice wall has helped reduce the radioactive water by half. The plant also pumps out several times as much groundwater before it reaches the tsunami-damaged reactors via a conventional drainage system using dozens of wells dug around the area.
The groundwater mixes with radioactive water leaking from the damaged reactors.
The panel agreed Wednesday that the ice wall helps, but said it doesn’t completely solve the problem. Panel members suggested that additional measures be taken to minimize the inflow of rainwater and groundwater, such as repairing roofs and other damaged parts of the buildings.
The 1.5-kilometer (1-mile) coolant-filled underground structure was installed around the wrecked reactor buildings to create a frozen soil barrier and keep groundwater from flowing into the heavily radioactive area. The ice wall has been activated in phases since 2016. Frozen barriers around the reactor buildings are now deemed complete.
On Wednesday, TEPCO said the amount of contaminated water that collects inside the reactor buildings was reduced to 95 metric tons per day with the ice wall, compared to nearly 200 tons without one. That is part of the 500 tons of contaminated water created every day at the plant, and the other 300 tons were pumped out via wells, treated and stored in tanks.
In addition to the 35 billion yen ($320 million) construction cost funded by taxpayers’ money, the ice wall needs more than 1 billion yen ($9.5 million) annually in operating and maintenance costs. Critics have been skeptical about the ice wall and suggested that the greater use of wells — a standard groundwater drainage system — would be a cheaper and more proven option.
The plant has been struggling with the ever-growing water — only slightly contaminated after treatment — now totaling 1 million tons and stored in 1,000 tanks, which take up significant space at the complex, where a decades-long decommissioning effort continues. Officials say they aim to further reduce the amount of contaminated water in the reactor buildings before starting to remove melted fuel in 2021.



March 7, 2018 Posted by | Fukushima 2018 | , , | Leave a comment

Regulator urges release of treated Fukushima radioactive water into sea

11 jan 2018 tritium water release pacific NRA.jpg
The chief of Japan’s nuclear regulator said Thursday water at the crisis-hit Fukushima Daiichi nuclear plant that contains radioactive tritium even after being treated should be released into the sea after dilution.
“We will face a new challenge if a decision (about the release) is not made within this year,” Nuclear Regulation Authority Chairman Toyoshi Fuketa told a local mayor, referring to the more than 1 million tons of coolant water and groundwater that has accumulated at the facility crippled by the 2011 disaster triggered by a devastating quake and tsunami.
As local fishermen are worried about the negative impact from the water discharge, the Japanese government and Fukushima plant operator Tokyo Electric Power Company Holdings Inc. have not made a final decision on the treated water, which is currently stored in tanks.
In his meeting with Yukiei Matsumoto, mayor of Naraha town near the Fukushima plant, Fuketa said, “It is scientifically clear that there will be no influence to marine products or to the environment” following the water release.
The nuclear regulator chief underlined the need for the government and Tepco to quickly make a decision, saying, “It will take two or three years to prepare for the water release into the sea.”
At the Fukushima plant, toxic water is building up partly because groundwater is seeping into the reactor buildings to mix with water made radioactive in the process of cooling the damaged reactors.
Such contaminated water is treated to remove radioactive materials but tritium, a radioactive substance considered relatively harmless to humans, remains in the filtered water as it is difficult to separate even after passing through a treatment process.
At other nuclear power plants, tritium-containing water is routinely dumped into the sea after it is diluted. The regulator has been calling for the release of the water after diluting it to a density lower than standards set by law.
With limited storage space for water tanks, observers warn tritium could start leaking from the Fukushima plant.
On March 11, 2011, tsunami inundated the six-reactor plant, located on ground 10 meters above sea level, and flooded the power supply facilities.
Reactor cooling systems were crippled and the Nos. 1 to 3 reactors suffered fuel meltdowns in the world’s worst nuclear catastrophe since the 1986 Chernobyl disaster.

January 11, 2018 Posted by | Fukushima 2018 | , , , , | Leave a comment

TEPCO Urged to Cut Radioactive Water inside Fukushima N-Plant

feb 2016.jpg



Tokyo, July 19 (Jiji Press)–Japan’s Nuclear Regulation Authority on Tuesday instructed Tokyo Electric Power Company Holdings Inc.  to reduce the amount of highly radioactive water inside reactor buildings at its disaster-crippled Fukushima No. 1 nuclear power plant.

The nuclear watchdog also demanded TEPCO lower the water’s radiation levels and consider substantially boosting the number of water storage tanks at the plant in order to lower the risk of the contaminated water leaking out.

Currently, there are tanks only enough to store contaminated water being generated every day mainly due to inflows of groundwater.

Meanwhile, the highly radioactive water inside the No. 1 to No. 4 reactor buildings totaled some 61,600 tons as of Thursday. A lot of tanks would need to be built in order to remove the contaminated water from the buildings.

The highly radioactive water may leak out if tsunami hits the plant again, Toyoshi Fuketa, acting head of the NRA, said, demanding cuts in the amount of the water.

July 19, 2016 Posted by | Fukushima 2016 | , | Leave a comment