Posted by: Dr Churchill | January 29, 2014

Fukushima Water Heavy in Radiation still Leaking into Pacific Ocean — Few things You should know

Since the Tohoku earthquake and tsunami crippled Japan’s Fukushima Daiichi nuclear power plant in 2011, concerns have spread among the public that water with radioactive material might be traveling in a plume across the Pacific Ocean toward the west coast of North America.

Experts say the radiation levels reaching the U.S. coast and Hawaiian Islands will be too low to threaten human health or marine life, but no U.S. government or international agency is actually monitoring the radiation in these places at the present time.

And the tensions are again rising in Japan over radioactive water leaking into the Pacific Ocean from Japan’s crippled Fukushima Daiichi nuclear plant, through an unidentified breach in the reactor number 3 that went into melt-down and is still far too unstable and dangerous. This leak is the radiation escape that has defied the plant operator’s efforts to gain control of the stability of the situation for almost three years now.

Prime Minister Shinzo Abe in the past had called the matter “an urgent issue” and had ordered the government to step in and help in the clean-up, following an admission by Tokyo Electric Power Company that water is seeping past an underground barrier it attempted to create in the soil. The head of a Nuclear Regulatory Authority task force told Reuters the situation was an “emergency.”

It marked a significant escalation in pressure for TEPCO, which has come under severe criticism since what many view as its belated acknowledgement July 22 that contaminated water has been leaking for some time. The government now says it is clear that 300 tons (71,895 gallons/272,152 liters) are pouring into the sea each day, enough to fill an Olympic-size swimming pool every eight days. While Japan grapples with the problem, here are some answers to basic questions about the leaks:

Q: How long has contaminated water been leaking from the plant into the Pacific?

Shunichi Tanaka, head of Japan’s Nuclear Regulation Authority, has told reporters that it’s probably been happening since an earthquake and tsunami touched off the disaster in March 2011. According to a report by the French Institute for Radiological Protection and Nuclear Safety, that initial breakdown caused “the largest single contribution of radionuclides to the marine environment ever observed.” Some of that early releases were actually intentional, because TEPCO reportedly had to dump 3 million gallons of water contaminated with low levels of radiation into the Pacific to make room in its storage ponds for more heavily contaminated water that it needed to pump out of the damaged reactors so that it could try to get them under control.

But even after the immediate crisis eased, scientists have continued to find serious radioactive contamination in the oceanic waters off the plant. Ken Buesseler, a senior scientist with the Woods Hole Oceanographic Institution who has analyzed thousands of samples of fish from the area, said he’s continued to find the high levels of cesium-134, a radioactive isotope that decays rapidly. That indicates it’s still being released. “It’s getting into the ocean, no doubt about it,” he said. “The only news was that they finally admitted to this.”

Q: How much and what sort of radiation is leaking from the plant into the Pacific?

TEPCO said Monday that radiation levels in its groundwater observation hole on the east side of the turbine buildings had reached 310 becquerels per liter for cesium-134 and 650 becquerels per liter for cesium-137. That marked nearly a 15-fold increase from readings five days earlier, and exceeded Japan’s provisional emergency standard of 60 becquerels per liter for cesium radiation levels in drinking water. (Drinking water at 300 becquerels per liter would be approximately equivalent to one year’s exposure to natural background radiation, or 10 to 15 chest X-rays, according to the World Health Organization. And it is far in excess of WHO’s guideline advised maximum level of radioactivity in drinking water, 10 becquerels per liter.) Readings fell somewhat on Tuesday. A similar spike and fall preceded TEPCO’s July admission that it was grappling with leakage of the radioactive water.

Scientists who have been studying the situation were not surprised by the revelation, since radiation levels in the sea around Japan have been holding steady and not falling as they would if the situation were under control. In a 2012 study, Jota Kanda, an oceanographer at Toyko University of Marine Science and Technology, calculated that the plant is leaking 0.3 terabecquerels (trillion becquerels) of cesium-137 per month and a similar amount of cesium-134. While that number sounds mind-boggling, it’s actually thousands of times less than the level of radioactive contamination that the plant was spewing in the immediate aftermath of the disaster, estimated to be from 5,000 to 15,000 terabecquerels, according to Buesseler. For a comparison, the atomic bomb dropped on Hiroshima released 89 terabecquerels of cesium-137 when it exploded.

Another potential worry: The makeup of the radioactive material being leaked by the plant has changed. Buesseler said the initial leak had a high concentration of cesium isotopes, but the water flowing from the plant into the ocean now is likely to be proportionally much higher in strontium-90, another radioactive substance that is absorbed differently by the human body and has different risks. The tanks (on the plant site) have 100 times more strontium than cesium, Buesseler said. He believes that the cesium is retained in the soil under the plant, while strontium and tritium, another radioactive substance, are continuing to escape. (

Q: Why is the plant continuing to leak?

There are at least a couple of possibilities. In an effort to cool and control the damaged reactors, TEPCO has pumped enormous amounts of water in and out. But that water is contaminated with radioactive material, and it has to go someplace. According to a recent report issued by the International Atomic Energy Agency, the plant operator has been storing highly contaminated water in seven underground storage ponds, which have a total of 60,000 tons (14.4 million gallons/54.5 million liters) of capacity. In April, TEPCO workers discovered that at least three of the ponds were leaking. The IAEA concluded that the company’s monitoring system, which hadn’t spotted the breach, was insufficient to spot such outflow. So it could be that the faulty containments, which are now being replaced, are the source of at least some of the contaminated water that’s gotten into the ocean.

But most experts seem to think that ordinary movement of groundwater probably is the real culprit. An estimated 400 tons (95,860 gallons/ 362,870 liters) of water streams into the basements of the damaged reactors each day. Keeping that water from continuing to flow into the ocean is crucial. As the IAEA noted in its report, “the accumulation of enormous amounts of liquids due to the continuous intrusion of underground water into the reactor and turbine buildings is influencing the stability of the situation.”

“Big surprise—water does flow downhill,” said Dr. Janette Sherman, a medical expert on radiation and toxic exposure who once worked as a chemist for the Atomic Energy Commission, the forerunner of today’s U.S. Nuclear Regulatory Commission. “If you’ve ever had a leak in your house during a storm, you know how hard it is to contain water. There’s a lot of water going into the plant, and it’s got to go someplace. It’s very hard to stop this.”

Q: What can be done to stop the leaking?

According to TEPCO’s latest full status report on the cleanup of Fukushima Daiichi, issued in October 2012, the utility company already had put in place an array of measures to try to control the radioactive water. It built a groundwater bypass system, which tries to siphon off and reroute groundwater flowing down from the mountain side of the complex, before it can get into the basements of the reactor buildings and be contaminated. But that doesn’t seem to have made much of a dent in the problem.

Plant workers also tried to create an underground barrier by injecting chemicals into the soil to solidify the ground along the shoreline of the Unit 1 reactor building. But TEPCO officials Tuesday said the water was seeping under or past this barrier. Officials also believe the water is rising to the surface, which is a troubling development because it could hasten leakage into the sea.

The company also continues to add to a massive tank farm on the site, with capacity to store about 400,000 tons (95 million gallons/360 million liters) of contaminated water, and is planning to add an additional 300,000 tons of capacity over the next three years. Unfortunately, TEPCO must deal with an ever-increasing amount of contaminated water—nearly 150,000 tons (35.9 million gallons/136 million liters) a year—so it’s inevitable that the company is going to run out of storage space.

That’s why TEPCO seems to be betting heavily on another solution—an elaborate state-of-the art system for filtering the accumulated water and removing radioactive materials from it. According to New Scientist, the new system supposedly can filter out 62 different radioactive substances. However, the April IAEA report noted that the filtering system is still a work in progress, and that in tests so far, “it has not accomplished the expected result” in terms of removing radioactive material from the water. Additionally, the system doesn’t remove tritium, which isn’t as radioactive as other materials in the water, but which still is a health hazard if it is inhaled or ingested. The Wall Street Journal recently reported that TEPCO hopes eventually to be able to discharge the cleansed water into the ocean, though that plan would likely meet intense opposition from local fishermen. Sherman, who has a chemistry background, said she’s skeptical that such a process could work on the enormous scale required. “You can precipitate these things out in the laboratory, but you’re talking about many millions of gallons here,” she explained.

In a July 26 press release, TEPCO had also said it would continue construction of a shielding wall along the waterline, but that structure will not be finished until September 2014.  Marine scientist Buesseler isn’t sure that will work, either. “You can build a dam, but eventually the water goes around it,” he explained.

Q: How far is the radiation spreading, and how fast does it travel?

The initial gigantic deluge of contaminated water dispersed through the immediate Fukushima coastal area very quickly, according to a 2012 report by the American Nuclear Society. But it takes years for the contamination to spread over a wider area. A mathematical model developed by Changsheng Chen of the University of Massachusetts at Dartmouth and Robert Beardsley of the Woods Hole Oceanographic Institute found that radioactive particles disperse through the ocean differently at different depths. The scientists estimated that in some cases, contaminated seawater could reach the western coast of the United States in as little as five years. Buesseler thinks the process occurs a bit more rapidly, and estimates it might take three years for contamination to reach the U.S. coastline.

Q: What are the potential risks to humans, and who might be affected by the contamination?

This is a murky question, because it’s not that easy to determine whether health problems that may not show up for decades are caused by exposure to radioactive contamination. A report released in February by the World Health Organization, which was based upon estimates of radiation exposure in the immediate wake of the accident, concluded that it probably would cause “somewhat elevated” lifetime cancer rates among the local population. But figuring out the effect of years of exposure to lower levels of radioactive contamination leaking into the ocean is an even more complicated matter.

Minoru Takata, director of the Radiation Biology Center at Kyoto University, told the Wall Street Journal that the radioactive water doesn’t pose an immediate health threat unless a person goes near the damaged reactors. But over the longer term, he’s concerned that the leakage could cause higher rates of cancer in Japan.

Marine scientist Buesseler believes that the leaks pose little threat to Americans, however. Radioactive contamination, he says, quickly is reduced “by many orders of magnitude” after it moves just a few miles from the original source, so that by the time it would reach the U.S. coast, the levels would be extremely low.

Q: Will seafood be contaminated by the leaks?

As Buesseler’s research has shown, tests of local fish in the Fukushima area still show high enough levels of radiation that the Japanese government won’t allow them to be caught and sold for human consumption—a restriction that is costing Japanese fishermen billions of dollars a year in lost income. But while flounder, sea bass, and other fish remained banned for radiation risk, in 2012 the Japanese government did begin allowing sales of octopus and whelk, a type of marine snail, after tests showed no detectable amount of cesium contamination.

Buesseler thinks the risk is mostly confined to local fish that dwell mostly at the sea bottom, where radioactive material settles. He says bigger fish that range over long distances in the ocean quickly lose whatever cesium contamination they’ve picked up. However, the higher concentration of strontium-90 that is now in the outflow poses a trickier problem, because it is a bone-seeking isotope. “Cesium is like salt—it goes in and out of your body quickly,” he explains. “Strontium gets into your bones.” While he’s still not too concerned that fish caught off the U.S. coast will be affected, “strontium changes the equation for Japanese fisheries, as to when their fish will be safe to eat.”

All this and still we fail to monitor the oceans for the levels of radiation and the necessary alerts to People’s Health and Safety.

This needs to be corrected soonest…

So now, the Woods Hole Oceanographic Institution (WHOI) in Massachusetts is launching a new citizen science project to measure levels of radioactive cesium in water washing up along the West Coast.

“The levels of cesium in the ocean we expect of the west coast of North America are not of concern for our own exposure or fisheries,” said WHOI marine chemist Ken Buesseler, who is leading the project. But whether people agree with these predictions or not, radiation levels should be monitored to confirm them, Buesseler said.

A recent study suggests the radioactive plume from Fukushima will reach U.S. coastal waters starting early this year, and peaking in 2016. But ocean currents off Japan’s eastern coast have most likely diluted the radioactivity to well within safe levels set by the World Health Organization, said study leader Vincent Rossi, an oceanographer and postdoctoral research fellow at the Institute for Cross-Disciplinary Physics and Complex Systems in Spain.

Buesseler started sampling the seawater around the Fukushima plant — sometimes from as close as a half mile away — three months after the disaster. His team has dozens of water samples from the coast of Japan to the middle of the Pacific, but needs samples spanning the rest of the Pacific to the West Coast.

He launched a website Jan. 14 called “How Radioactive is Our Ocean?”, where the public can make tax-deductible donations to support the analysis of existing samples or propose and fund new sampling locations along the West Coast.

Collection and analysis of a seawater sample costs $550 to $600, depending on the site’s location. The scientists are asking individuals or communities to donate a minimum of $100 in seed funding, and WHOI will create a fundraising website for each location that is selected for sampling.

When a person or group raises enough money, WHOI will send a sampling kit so volunteers can collect about 5 gallons (19 liters) of seawater and ship it back to WHOI for analysis.

The scientists will use a $75,000 instrument to detect levels of biologically hazardous gamma-rays, produced by the decay of radioactive cesium in the samples. The results of the analysis will be posted on an online map, showing cesium concentrations and the names of sponsors.

The oceans already contain naturally occurring radioactive chemical elements, as well as remnant radiation from nuclear-weapons testing during the 1950s and ’60s. Scientists can take a fingerprint of the Fukushima radiation by precisely measuring the ratio of the chemical variant cesium-137 left by weapons testing, which has a 30-year half-life, to the chemical form cesium-134 from Fukushima, which has a two-year half-life. (Half-life is the time it takes for half of the material to radioactively decay.)

The U.S. safety limit for cesium levels in drinking water is about 28 Becquerels (Bq), the number of radioactive decay events per second, per gallon (7,400 Bq/cubic meter). For comparison, uncontaminated seawater contains only a few Bq/cubic m of cesium, and much higher levels of other, naturally occurring radioactive elements.

Yours,
Pano

PS:

Keep taking your iodine and hope for the best…

And to ensure the safety of your iodine and related products from West Coast seaweed, we have a separate project, known as Kelp Watch 2014, where researchers plan to monitor the radiation levels in California’s kelp forests.

“Part of the reason for doing this is because the public is very freaked out by all this talk of radioactivity,” the study’s leader, biologist Steven Manley of California State University, Long Beach, told KQED Science. “If they can actually see the numbers and a commentary as to what they mean, hopefully that will put them at ease or alert them to the ongoing risks.”

Fukushima into the sea

 

 

 

 

 

Fukushima Burning

 

 

 

 

 

Fukushima Radiation Tanks

 

 

 

 

 

Fukushima Nuclear Melt down and Hydrogen Explosion photo

 

 

 

 

 

 

 

 

Fukushima radioactive oceanic water movement chart 1-1-14


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