Tag Archives: Fukushima

TEPCO fails to restart Fukushima water decontamination process

TEPCO fails to restart Fukushima water decontamination process TEPCO fails to restart Fukushima water decontamination process

The water decontamination process at the crippled Fukushima nuclear power plant has once again been halted, only about six hours after the plant’s operator TEPCO announced it was resuming the purification process following a previous failure.
Continue reading «TEPCO fails to restart Fukushima water decontamination process»

Six days ago, Tokyo Electric Power Co. (TEPCO) detected a failure in what is known as the Advanced Liquid Processing System (ALPS). The company said that up to 900 tons of water, which had not been sufficiently cleaned in the ALPS equipment, flowed into a network of 21 tanks that were holding 15,000 tons of treated water. Not only have the 21 tanks been rendered unusable, but all 15,000 tons of previously cleaned water has to be retreated.

TEPCO said it restarted two of three lines used to clean toxic water at around 04:00 GMT on Monday. A third line remained offline while crews examined a filter defect, AFP reported.

Yet shortly before 10:00 GMT, TEPCO suspended the ALPS of the two units after finding about a half liter of leaked water at a tank designed to measure levels of radioactive materials in the processed water, according to Jiji Press. TEPCO said in a press release that there were no new leaks outside the system, though.

The difficulties only mark the latest challenges TEPCO has faced since March 2011, when a 9.0 megathrust earthquake triggered a subsequent tsunami that resulted in a badly-damaged Fukushima Daiichi nuclear power plant.

The ALPS system was developed to dramatically curb the radiation level of highly contaminated water that is accumulating at the plant. The ALPS consists of 14 steel cylinders through which the contaminated water is filtered. After the filtering, waste materials like the absorbent and remaining sludge are transferred to high-integrity containers (HICs) that are transported to a temporary storage facility.

The ALPS can remove 62 different types of radionuclides, including strontium and cobalt, from contaminated water. While the system cannot remove tritium – a radioactive isotope of hydrogen – the purification of water through the system is expected to reduce damage levels if water leaks from storage tanks.

The equipment, which is supposed to be able to treat up to 750 tons of contaminated water a day, has been undergoing trial runs since March 2013. The system, however, has been plagued with problems from the outset. The latest glitch and subsequent recontamination was caused when one of the three ALPS lines failed to remove radioactive substances to a sufficient level.

In mid-January, TEPCO warned that nuclear radiation at the boundaries of the damaged facility had jumped to eight times the government safety guidelines, while only a week into the new year, plant operators once again had to stop using its systems to decontaminate radioactive water. Compounding their problems at the time, a crane used to get rid of the container from the ALPS ceased functioning.

TEPCO has struggled to manage a growing volume of contaminated water at the plant. About 436,000 cubic meters of contaminated water is stored at the site in about 1,200 tanks.

Source: RT

TEPCO reveals record cesium level in Fukushima No. 1 well

fukushima1 TEPCO reveals record cesium level in Fukushima No. 1 well

A record high level of radioactive cesium has been found in groundwater beneath the crippled Fukushima No. 1 nuclear power plant, it operator TEPCO revealed.
Continue reading «TEPCO reveals record cesium level in Fukushima No. 1 well»

On February 13, Tokyo Electric Power Co. reported 37,000 becquerels of cesium-134 and 93,000 becquerels of cesium-137 were detected per liter of groundwater sampled from a monitoring well earlier that day.

Water samples were taken from the technical well, located next to the second power unit, some 50 meters from the coast. These figures (the total reading) are the highest of all the cesium measurements taken previously.

Experts do not rule out that radioactive water is leaking from an underground tunnel, which is located close to the second power unit on the seashore.

However, no exact reason for such a significant increase of radioactive cesium content in the groundwater has been given so far.

Japanese newspaper The Asahi Shimbun reported that the amount of radioactive chemicals seems to be increasing. On Feb. 12, the same sampling well had produced a combined cesium reading of 76,000 becquerels per liter.

Earlier Japan’s nuclear regulator slammed the stricken Fukushima plant operator for incorrectly measuring radiation levels in contaminated groundwater at the site.

The Nuclear Regulation Authority (NRA) accused TEPCO of lacking basic understanding of measuring and handling radiation almost three years since the reactor meltdowns at the Fukushima No. 1 nuclear power plant.

On Thursday, fears of new leaks surfaced in Japanese media, as the same newspaper reported two cracks in a concrete floor of the No. 1 facility near radioactive water storage tanks.

TEPCO suggested some contaminated water from the melting snow may have seeped into the ground through the cracks, stretching for 12 and 8 meters.

The leakage of radiation-contaminated water is posing a major threat to Japan’s population and environment and to the international community since the March 2011 disaster.

Source: RT