Showing posts with label Kurion. Show all posts
Showing posts with label Kurion. Show all posts

Sunday, November 3, 2013

U.S. Energy Secretary Ernest Moniz to Japanese Government: "Ratify the Convention on Supplementary Compensation for Nuclear Damage, and We Will Send Kurion to Help TEPCO"


Kurion?

So what's the trick?

Reading the Bloomberg article linked below, the trick seems to be that Kurion wouldn't be liable under the ratified treaty even if Kurion's patented system to remove TRITIUM (really?) doesn't work or fails to deliver or causes damage. Only the plant operator, in this case TEPCO, would be held liable.

Kurion's cesium absorption system was sold by then-US Energy Secretary and Nobel Prize winner Steven Chu in 2011, right after the start of the Fukushima nuclear accident. As with any system installed at the plant after the accident, Kurion's cesium absorption system was plagued with problems from the beginning (too many to list here, but browse through these posts) and sub-par performance. TEPCO stopped using it when Toshiba's SARRY came online in October 2011.

A quick check on Kurion's website shows the current CEO of the company from France's AREVA with close ties with the US Department of Energy, and two people whose career was with the Department of Energy, and one former researcher at Oak Ridge National Laboratory. The company was founded by a venture capital in 2008.

Now the new Secretary of Energy is trying to peddle a new system from the same company - tritium removal system. Just like the cesium absorption system, Kurion and the US Department of Energy probably want to use Fukushima I Nuclear Power Plant as a test site for unproven or prototype technology, with liability safely on TEPCO, a clueless, technologically-blind plant operator.

From Bloomberg News (11/3/2013; emphasis is mine):

U.S. Says Japan Signing Liability Pact Would Aid Nuclear Cleanup

Japan will receive international help with the cleanup at the Fukushima atomic station once it joins an existing treaty that defines liability for accidents at nuclear plants, U.S. Energy Secretary Ernest Moniz said.

The treaty, known as the Convention on Supplementary Compensation for Nuclear Damage, assigns accident liability to plant operators rather than equipment and technology vendors, Moniz said in a Nov. 2 interview in Tokyo. The treaty includes setting up a fund for victims of nuclear accidents and a standard for compensation claims.

Japanese Prime Minister Shinzo Abe, Trade Minister Toshimitsu Motegi and other officials showed an “eagerness” during meetings last week for expertise from abroad to decommission the Fukushima plant, Moniz said. Such help will be easier to secure once Japan ratifies the treaty, he said.

“As one gets into the real work, then these liability conventions become quite important,” Moniz said. “Certainly Prime Minster Abe and Minster Motegi both emphasize that the importance of moving on this in 2014 is to a large extent driven by their openness and their desire to get as much international help as they can.”

...

The Compensation for Nuclear Damage treaty was adopted in 1997 under the International Atomic Energy Agency and had 16 signatories as of June 24 this year, including the U.S., India and Italy.

At least five signatories must ratify the treaty to enact it. So far, the U.S., Romania, Morocco and Argentina have ratified. So Japan joining would bring it into force, Moniz said.

Legislation ratifying the convention could be introduced to parliament early next year, Foreign Minister Fumio Kishida told reporters on Nov. 1, Kyodo news reported.

Under the pact, a company such a Irvine, California-based Kurion Inc., which possesses technology for removing the radioactive isotope tritium from contaminated water, could deploy its technology at the Fukushima plant, Moniz said.

Liability would rest with Tepco, as the plant’s operator is known, he said.

(Full article at the link)


If the Abe administration is indeed "eager" for the international (read United States here) expertise that will come by ratifying the treaty, it will probably be not particularly for the expertise, as far as I see it.

It will be for the fund to be set up for the victims and a set standard for compensation, I think, which must be more advantageous to the government than what (sort of) exists currently (i.e. saving tons of money for the government).

It would be amazing, to me, if the countries who have already ratified the treaty actually allows Japan to join them, after the fact (=nuclear accident).

Kurion's press release on their tritium-removing technology is copied below. (Please let me know if there is more to it than meets the eye, as I cannot picture a system from the press release that will treat over 100,000 tonnes of water that are in the storage tanks and turbine building basements at Fukushima I Nuke Plant...)

Press Releases
Kurion Introduces Tritium Removal Technology to Limit Release of Radionuclides into Environment

Originally Published on 09/30/2013

Patent-pending Modular Detritiation System™ Strengthens Clean, Safe Value of Nuclear Power

Kurion, Inc., an innovator in nuclear and hazardous waste management, announced a breakthrough in the treatment of the historically difficult to capture isotope with the introduction of its patent-pending Modular Detritiation System™ (MDS™) to decontaminate tritiated water. The ability to perform light water detritiation (i.e., the removal of tritium from water) enables the safe release of purified water into the environment or recycling of reactor cooling water. The technology has applications for light water reactors, which are the dominant nuclear plant designs worldwide.

The decontamination of tritium (T) is particularly problematic: it is a special form of hydrogen that forms tritiated water (HTO vs. H2O), which does not lend itself to removal by conventional technologies. This is because instead of the contaminant being carried along in water in suspended or dissolved form, the water molecule itself is modified. As a result, tritiated water is particularly difficult to treat and can spread easily if it escapes into the environment.

“Preventing the release of tritium into the environment represents one of the last remaining environmental challenges for nuclear energy,” said Bill Gallo, chief executive officer of Kurion. “The key value of Kurion’s patent-pending detritiation technology is that it offers an economical alternative to releasing tritium into the environment and bolsters the appeal of nuclear power as a clean, safe energy source.”

John Raymont, Kurion founder and president of international operations, added, “Historically, nuclear power plants were forced to release tritium into the environment because there was no method to remove it economically. Kurion’s new detritiation system now offers a technology-based alternative with the benefit of addressing the public's concern over environmental release.”

The industrial process of removing tritium from water has historically focused on cleaning highly contaminated “heavy water” for recycling back into nuclear reactors, such as for the CANDU design. However, this technology is prohibitively expensive for use with light water reactors. The Kurion MDS™ builds upon proven heavy water solutions and makes advances in throughput and efficiency where the tritium removal occurs. Kurion has developed an economical solution that – for the first time – would allow for recycling or clean release of reactor cooling water for light pressurized water reactors.

Wednesday, December 21, 2011

#Fukushima I Nuke Plant: Field of Cesium Towers

Level the ground, pour in concrete slab, pile up a lot of sandbags. Decidedly conventional tech. And this has to last for no one knows how long. According to TEPCO, as of December 20, the total number of used cesium towers (Kurion and Toshiba) was 316, with the storage capacity of 393 , and the number of used cesium towers increased by 4 from the previous week. Even at this slow rate, the storage would have been full in 19 weeks or about 5 months. Therefore this "kick the can" construction of more storage space.

One area for Kurion (544 towers capacity), another for Toshiba's SARRY (200 towers). From the looks of it, TEPCO will move the existing used towers from the existing temporary storage space to these new temporary storage facility. That means Kurion's storage will be already more than half full (currently 288 towers), and Toshiba's storage will be more than 10% full (currently 28 towers) already.

Why do they need two separate areas for Kurion and Toshiba in the same facility? Because the size of the cesium towers from these companies is too different, as you can see in the TEPCO's diagram below. Kurion's tower is about 2.4 meter tall (probably built to the spec in inches and feet), and Toshiba's tower is about 3.8 meter tall (probably built in centimeters and meters). It seems Toshiba's SARRY towers do not need concrete lids on top, so they are doubling the height of the rack for SARRY towers and using concrete panels to create secure containment for Kurion towers.

Ah the infinitely long road to "recovery" at Fukushima I Nuclear Power Plant.

From TEPCO's press release on December 21, you see this diagram of the facility:

30-centimeter thick concrete slab on top of some sort of substrate. That doesn't inspire much sense of security, considering the recent leak from the evaporative condensation apparatus (desalination), whose concrete perimeter cracked because the concrete wasn't cured long enough.

Here's the facility up-close (click for a bigger photo):


Friday, September 16, 2011

Contaminated Water Treatment at #Fukushima I: What Kurion Took Away, AREVA Put It Back

Radioactive cesium, that is.

TEPCO announced the numbers for the density of radioactive materials after the decontamination using Kurion and then AREVA.

Cesium-134:
940,000 Bq/cm3 --> Kurion, ND --> AREVA, 450,000 Bq/cm3, and 66,000 Bq/cm3 (2 tests)

Cesium-137:
1,100,000 Bq/cm3 -->Kurion, ND --> AREVA, 520,000 Bq/cm3, and 77,000 Bq/cm3

So what is TEPCO's solution to the conundrum?

Stop using AREVA.

Does the company know why this happened?

No.

Is the company interested in knowing?

No.

To see the data for yourself, go here (PDF).

Thursday, September 15, 2011

#Contaminated Water Treatment System at #Fuku I: TEPCO to Use SARRY Only from October

Just as I thought. TEPCO will ditch the Kurion-AREVA combo that has had numerous problems from the beginning and will rely solely on Toshiba (and IHI and US's Shaw)'s SARRY for highly contaminated water treatment. Toshiba's SARRY has had its share of problems but not as many as the Kurion-AREVA duo.

The latest trouble at the water treatment system: the density of radioactive materials, reduced after Kurion's treament, shot up again after AREVA's treatment.

From Mainichi Shinbun (9/15/2011):

 東京電力は15日、福島第1原発事故で生じた高濃度の放射性物質を含む汚染水を浄化して原子炉の冷却に使う「循環注水冷却システム」で、米キュリオン社の装置によって下がった放射性物質の濃度が、続いて仏アレバ社の装置を通すと上がるトラブルが起きたと発表した。アレバ社の装置が処理する高濃度の汚泥が流出した可能性もあり、原因を調べている。現在は、アレバ社の装置は止め、キュリオン社の装置だけで処理している。

TEPCO announced on September 15 that there was a trouble in the reactor cooling system that circulates water treated in the contaminated water treatment system. The density of radioactive materials that decreased after the treatment with Kurion's system increased after the treatment with AREVA's system. It is possible that highly radioactive sludge in AREVA's system leaked. TEPCO is investigating the cause. Currently, AREVA's system is stopped, and the treatment is done by Kurion's system alone.

 東電が同日、両社の装置の処理能力を確認したところ、キュリオン社単独では汚染水の放射性物質の濃度が1立方センチ当たり数百万ベクレルから数百ベクレルまで下がったが、その汚染水を続けてアレバ社の装置で処理すると、逆に数十万ベクレルに上がった。

TEPCO looked at the treatment performance of both systems and found that Kurion's system had reduced the density of radioactive materials from several million becquerels/cubic centimeter to several hundred becquerels/cubic centimeter. However, when that treated water was further processed in AREVA's system, the density shot up to several hundred thousand becquerels/cubic centimeter.

 東電は10月以降、キュリオン社とアレバ社の装置を組み合わせた浄化システムを止め、比較的故障が少ない東芝製の別の浄化装置「サリー」で汚染水を浄化する方針だ。

TEPCO plans to stop using Kurion-AREVA system starting October, and use Toshiba's SARRY exclusively for contaminated water treatment. SARRY has had a relatively small number of failures compared to Kurion's or AREVA's system.

TEPCO was working on both Kurion's and AREVA's system from September 13, replacing a pump at Kurion's and a stirrer in the coagulation settling unit at AREVA's. Maybe that had something to do with the problem. Maybe not. TEPCO is not very forthcoming, as you may have noticed over the past 6 months.

Friday, September 2, 2011

How 2 Workers Got Wet from Contaminated Water from Kurion's Vessel

TEPCO has a cute illustration of what happened. The worker's error, the company says, of removing the hose without shutting the valve off.

(When the workers get blamed, look for the real cause elsewhere.)

TEPCO's handout for the press on 9/1/2011:


Sunday, August 7, 2011

#Contaminated Water Treatment: AREVA's Unit is Back, Kurion Is Still Down

First, about AREVA's pump that feeds chemicals:

According to NHK Japanese (8/7/2011) who cannot mention names of the companies as a public broadcaster,

福島第一原発では、7日午前8時すぎに汚染水の浄化設備のうち、フランス製の装置で汚染水に処理用の薬剤を流し込むポンプが停止したうえに予備のポンプも動かず、浄化設備全体の運転が停止しました。

The pump for the chemicals for the treatment for the contaminated water stopped in the French-made system [AREVA] stopped at 8AM on August 7. The backup pump failed to start, and the entire treatment system shut down.

東京電力では、薬剤の粘りけが強いためにポンプに負荷がかかって停止したものとみて、薬剤を流す力を調整したうえで午後3時半すぎに運転を再開しましたが、予備のポンプが動かなかった理由は分かっていません。

According to TEPCO, the viscosity of the chemicals were too strong, putting too much pressure on the pump. TEPCO adjusted the flow of the chemicals and restarted the pump at 3:30PM. The reason why the backup pump didn't work is still unknown.

And Kurion's pumps are still offline, according to NHK.

With Toshiba's SARRY not even in the test run yet and Kurion offline, the contaminated water treatment is done by Toshiba's oil separation unit - AREVA's co-precipitation decontamination unit - Hitachi's desalination by reverse osmosis - AREVA and Toshiba's evaporative concentration unit (new). Decontamination is totally dependent on AREVA's unit for now.

Snippets that I pick up from Twitter and some Japanese magazine articles interviewing anonymous high-level managers at Fukushima I Nuke Plant indicate that the workers have almost given up on having Kurion and AREVA units run without frequent problems, and are pinning their hope on Toshiba's SARRY. But they do say they are impressed with AREVA's unit's ability to decontaminate. When it is working, that is.

#Contaminated Water Treatment System Comes to a Dead Stop (Again)

The pumps failed, and TEPCO doesn't know why. Some of the pumps for Kurion's system stopped, and couldn't be restarted. One of the pumps in Areva's system that feed chemicals stopped, and the backup pump didn't work. The entire system is down.

From NHK Japanese (12:30PM JST 8/7/2011):

不安定な状態が続いている東京電力福島第一原子力発電所の汚染水の浄化設備で、7日朝、汚染水を処理するためのポンプが止まったうえに予備のポンプも動かないなどトラブルが相次ぎ、再び運転を停止しています。

The contaminated water treatment system at Fukushima I Nuclear Power Plant has been unstable, but on August 7 morning, the system was stopped after the pumps stopped and the backup pump failed.

... ところが、7日午前7時すぎ、汚染水の浄化設備のうち放射性セシウムなどを取り除くアメリカ製の装置で、汚染水を送る一部のポンプが突然停止し、再起動もできなくなりました。

About 7AM on August 7, some of the pumps that transport contaminated water in the US-made system [Kurion's] that removes radioactive cesium and other nuclides suddenly stopped, and couldn't be re-started.

さらに、午前8時すぎにはフランス製の別の装置でも汚染水に処理用の薬品を混ぜるポンプが停止したうえに予備のポンプも動かず、汚染水の浄化設備のすべての運転が停止しました。

Then about 8AM, a pump that feeds chemicals to the water stopped in the French-made [AREVA's] system, and the backup pump also failed. The entire water treatment system has stopped.

原子炉への注水は処理済みの水を使って続けているということですが、これらの浄化設備を巡っては、4日にも別のポンプが一時停止したほか、5日も警報が鳴って運転が止まるなど不安定な状態が続いています。

Water injection to the reactor continues with the water that have already been treated, according to TEPCO. The treatment system continues to be unstable. On August 4, a different pump stopped temporarily, and on August 5 an alarm sounded off and the system stopped.

東京電力では、より安定的な運転を目指して国産の新しい処理装置を追加して設置していますが、汚染水の保管場所の水位に余裕がないため、この装置の試運転を延期して汚染水の処理を優先することにしていました。

TEPCO has added a new treatment system [made by Toshiba] for more stable operation of the system, but since the water level is very close to the limit in the storage area [Central Waste Processing Facility] TEPCO has delayed the test run of the new system so that they can treat more contaminated water.

東京電力でトラブルの原因を調べるとともに、設備の復旧を急いでいます。

TEPCO is looking into the cause of the trouble, and is trying to get the system back online quickly.

Thursday, July 14, 2011

#Fukushima Water Treatment System: Toshiba's Long Tall "SARRY" to the Rescue!

10 workers spent 2 minutes each to fix the PVC joint that broke off in AREVA's unit at Fukushima I Nuclear Power Plant on July 13, according to Asahi (link is in Japanese). The air radiation level at the location is 100 to 150 millisieverts/hour. For 2 minutes work, a worker could have received 5 millisieverts radiation.

The on-again-off-again water treatment system is finally on again, but at this point all TEPCO cares about is probably that these Kurion-AREVA units keep hobbling along, at least processing the amount of water that's being injected into the RPVs (Reactors 1, 2 and 3) so that the highly contaminated water in the reactor and turbine buildings does not increase.

Why? Because Toshiba's "SARRY" will soon come to the rescue. (Photo is from Asahi.)

SARRY stands for "Simplified Active Water Retrieve and Recovery System". Well, it doesn't quite stand for these words, but that's how Toshiba's been calling it.

It is already being installed at Fukushima I Nuke Plant, and is expected to come online sometime in early August. As it is planned right now, this Toshiba's system comes after Kurion and before AREVA.

SARRY is being jointly built by Toshiba, IHI, and the US company Shaw. A metal cylinder of 1.4 meter in diameter and 3.6 meters in height is filled with synthetic zeolite and titanium silicate. The system will connect these cylinders serially to decontaminate the water. The first half of the cylinders use absorbers with low percentage removal of cesium, and the second half of the cylinders use absorbers with higher percentage removal.

Toshiba thinks SARRY can reduce the amount of radioactive materials in the water to one-millionth, and process 1,200 tonnes of water per day.

The water will first go through the resin filters that remove oil, then through the cylinders filled with zeolite and titamium silicate for cesium removal. The system will be surrounded by lead panels to reduce radiation. Compared to Kurion's system which basically uses the same principle, Toshiba's system uses less pumps and thus less chance of breakdowns, according to TEPCO/Toshiba.

The drawings are probably written in a language that TEPCO and workers understand without dictionary, and it is probably being installed by Toshiba and its affiliates who are building the system.

If Toshiba's system delivers what it promises, there will be no need at all for Kurion or AREVA, and TEPCO can simply bypass both and just use SARRY. Kurion+AREVA can remain as a backup.

We'll see if Murphy will get Toshiba. After all, processing 1,200 tonnes of water per day and reducing the radioactive materials in the water to one-millionth is what was promised with Kurion and AREVA's systems.

Yomiuri has a video that Toshiba has released, showing the manufacturing and assembly of SARRY.

TEPCO's handout for press on July 14 has the diagrams and photos:









(I have a suspicion that Toshiba engineers wanted to call it "Sally", as in "Long Tall Sally". The system does use long tall cylinders, doesn't it? But as I said, "Sally" and "Sarry" don't make a bit of difference to most Japanese who are incapable of differentiating between "l" and "r". In Japanese they are pronounced the same, more like "l".)

Wednesday, July 6, 2011

#Fukushima I Nuke Plant: Contaminated Water Treatment System at 76% Operating Rate

TEPCO's target was at least 80%, and they were hoping to ramp it up to 90% quickly. Now the company says it will focus on achieving the steady 80% for now.

At least part of the reason for the less than desired operating rate looks to be Kurion's system.

Kurion's system has a decontamination factor (DF) of about 17, instead of 1,000 that was hoped for when the system started. In other words, instead of reducing 2 million becquerels/cubic centimeter of radioactive cesium in the water to 2,000 becquerels/cubic meters (DF of 1,000), Kurion's system reduces 2 million becquerels/cubic centimeter of cesium to 120,000 becquerels/cubic centimeter (DF of about 17).

TEPCO has found out that the Kurion's vessels that contain different types of zeolite for removing different nuclides need to be exchanged far more frequently than planned (which was one a day). In addition, the system needs "flushing" (cleaning out the system with water) every time a vessel is changed, and that results in several hours of downtime for the entire system.

From TEPCO's handout for the press on July 6, "flushing" operations since June 23 (link goes to the Japanese handout, as English handout is missing some info):

June 23: 1:00PM to 2:44PM
June 24: 10:00AM to 12:50PM
June 25: 10:00AM to 3:00PM
June 26: 10:00AM to 18:10PM
June 28: 10:06AM to 12:24PM
June 29: 10:45AM to 2:13PM
June 30: 10:46AM to 1:35PM
July 2: 10:30AM to 1:45PM
July 3: 10:39AM to 12:50PM
July 5: 10:30AM to 12:55PM

According to the tweets from a Fukushima I Nuke Plant worker, the system seems to stop at other times for other undisclosed reasons.

TEPCO changes a vessel when the surface radiation of the vessel reaches 4 millisieverts/hour. Since June 17 when the entire system started to operate, TEPCO has changed 43 vessels as of July 5. In 7 more days TEPCO estimates there will be additional 20 used vessels. TEPCO has the storage capacity of this highly radioactive vessels up to 192. At 20 vessels per week, the storage will reach capacity in less than 8 weeks.

For more on the contaminated water treatment system operation, TEPCO has a detailed report it submitted to the NISA on July 6.

Friday, June 24, 2011

#Contaminated Water Processing: AREVA Overachieved, Kurion Underachieved, But Full-Run Ready Next Week

According to TEPCO, Kurion's system reduced radioactive cesium in the highly contaminated water at Fukushima I Nuclear Power Plant to about 1/16 (or Decontamination Factor (DF) of 16), again falling short of 1/1,000 as hoped for.

But that was made up by AREVA's system that reduced radioactive cesium to about 1/6,700 (Decontamination Factor of 6,700) after Kurion, making the entire system reduction at slightly over 1/100,000. Good enough to go, even though they had hoped for 1/1,000,000.

Kurion's system fared even worse than the previous test with highly contaminated water announced on June 22. So it may not be just a matter of switching the order of decontamination or changing the zeolite types.

(Kurion can blame "workers", like TEPCO does habitually...)

From TEPCO's handout for the press, June 24 (Japanese only, so far), I added the English labels, DF for each system, and spelled out the amount of nuclides. The higher the DF, the better the system performance is. (Click on the image for a clearer view.)

Wednesday, June 22, 2011

#Contaminated Water Processing at #Fukushima: Wrong Valve Was Open in Kurion's System

Or so TEPCO says. The company also says it was the worker's error.

From what I can figure from the TEPCO's handout for the press in English on June 23 (their English reads like Google translation...maybe it is), the problem was in the Skid No.4 of the cesium absorption. One valve was open which shouldn't have been, letting some of the water bypassing the cesium absorption vessels No. 2 and No.3.

So, will this account for 1/20 of desired performance by the Kurion system? TEPCO is running the test with this valve closed.

Contaminated Water Processing at #Fukushima: Kurion's System Achieved Less Than 1/20 of Hoped-For Performance

AREVA's system fared better, achieving 40% of the hoped-for performance.

The reason? The deadly combo of seawater and very high radioactive materials in it.

According to TEPCO's handout for the press on June 22, Kurion's system managed to reduce the radioactive materials as follows:

Iodine-131

Before the treatment: 6900 becquerels/cubic centimeter
After the treatment: 990 becquerels/cubic centimeter
Decon Factor: 6.97
Hoped-for DF: not known

Cesium-134

Before the treatment: 2,000,000 becquerels/cubic centimeter
After the treatment: 43,000 becquerels/cubic centimeter
Decontamination Factor: 46.5
Hoped-for DF: 1,000

Cesium-137

Before the treatment: 2,200,000 becquerels/cubic centimeter
After the treatment: 48,000 becquerels/cubic centimeter
Decon Factor: 45.8
Hoped-for DF: 1,000

So, Kurion's system achieved less than 1/20 (or 4.6%) of the performance hoped for.

The result for AREVA's system are listed as "ND" (not detected), but it was assumed by TEPCO that AREVA's system's Decon Factor was less than 400, where 1,000 was hoped for. (Information from Yomiuri Shinbun)

By using both Kurion's and AREVA's systems, TEPCO had hoped that the radioactive materials in the water could be reduced to 1/1,000,000.

If Kurion's system reduced the radioactive materials to about 1/46 and AREVA's system 1/400, the combined performance was only 1/18,400, short of the minimum performance needed for the smooth operation of the desalination system (by Hitachi).

Desalination is essential if TEPCO wants to use the treated water as cooling water for the reactors.

TEPCO's Matsumoto said in the press conference that he had hoped that the water treatment system would start running full-scale in a couple of days, but now he wasn't sure when. (Information from Asahi Shinbun)

The Tohoku region that include Fukushima Prefecture entered the rainy season on June 21.

Sunday, June 19, 2011

#Fukushima Contaminated Water Treatment: 75 Tonnes of Water Processed in 5 Hours

Information I found in Chunichi Shinbun says the Toshiba-Kurion-Areva-Hitachi water treatment system at Fukushima managed to process 75 tonnes of highly contaminated water in 5 hours before it was manually shut down.

That's 15 tonnes per hour.

At that pace, it is 360 tonnes per day, and they are pouring 500 tonnes of water per day.

And it also means the contamination level that they expected the Kurion's subsystem to reach in a month was reached in 5 hours. That means the contamination was 144 times more than they had calculated.

(As someone said, it is as if they were reconstituting the nuclear fuel rods.)

I have some questions for the experts on this blog.

Why do they need to do this serially? Kurion's "vessel" (cylinder) is 90 centimeter in diameter, 2.3 meter high. It sure seems like a system meant for much smaller amount of water with much less contamination and the treatment process is to be done very carefully and slowly.

If you pour literally tons of water that needs to be cleaned fast, if you connect the cylinders serially, of course the very first cylinder would take a radioactive hit and the whole system would stop.

Why can't they just fill up a 20-foot container with zeolite, dump water from the top, put the spigot at the bottom, connect a hose to collect water back into a tank, dump the water again until the zeolite in the container gets too dirty? Have several such containers and do it at the same time.

Or for that matter, forget the neat system set up inside the building. Just dump bags of zeolite in the building basements where the contaminated water sits. And forget the idea of circulating the water to cool the reactor. The reactors are cool already because they are devoid of the corium.

Or bring an old oil tanker or two, as many people in Japan and outside have suggested from the beginning, and store the water there until a better water treatment system can be built and tested.

(Oh I forgot. I don't have PhD.)

#Fukushima I Nuke Plant: Another Leak in Kurion's System at "Rapture" (Rupture) Disk

Since the entire water treatment system was stopped in the early hours of June 18 after only 5 hours of full run due to the faster than expected rise in radiation level on the Kurion's oil/technetium separation unit, TEPCO has been using the low contamination water to clean out the system.

Well, while they were doing the cleaning run, they found another leak in the same oil/technetium separation unit.

From Asahi Shinbun (10:27PM JST 6/19/2011):

東京電力は19日、福島第一原発で本格稼働をめざしている放射能汚染水の浄化処理装置で、新たな水漏れを発見したと発表した。漏れたのは、装置のトラブルに伴って内部の洗浄のため流した低濃度の汚染水30リットル程度で、すでに回収した。

TEPCO announced on June 19 that it found a new leak in the water treatment system for highly contaminated water at Fukushima I Nuclear Power Plant. The amount of leak was about 30 liters of the low contamination water that the company was using to clean out the system after the trouble [of the oil/technetium unit] was found. The leaked water has already been collected.

 18日午後9時ごろ、点検中の作業員が見つけた。放射性物質や油分の吸着に使うゼオライトを入れた装置の安全弁が壊れ、円筒形の装置を囲う容器とのすき 間に水がたまっていた。安全弁は内部の圧力が高まると破れる仕組み。東電はポンプの動作と停止を繰り返した影響が考えられるという。安全弁は停止中に水素 がたまるのを防ぐ目的で取り付けているため、運転中は安全弁の手前の弁を閉めるなどの対応を検討する。

The leak was found at 9PM on June 18 by the worker conducting the inspection. The safety valve [rupture disk] of the oil/technetium unit was broken, and there was water between the cylinder [vessel] that contains zeolite and the container that holds the cylinder. The safety valve is designed to break when the pressure inside the vessel gets high. TEPCO believes it may be the result of having to repeatedly start and stop the pump. The purpose of the safety valve is to prevent the hydrogen leak during the system halt. TEPCO is considering closing the valve leading to the safety valve during the operation.

It looks like this water treatment system will have to involve carbon-based workers on a regular basis, instead of automatic, remote-controls.

Here's the detailed diagram of the hydrogen venting system that includes the rupture disk, which TEPCO labeled as "rapture disk". I thought that was funny. The difference in pronunciation between "rupture" and "rapture" totally escapes the Japanese.

(From the press conference handout on June 19; cleaner copy at the link)

Saturday, June 18, 2011

#Fukushima I Nuke Plant: Kurion's System Was Stopped At the Very First "Skid"

According to TEPCO's handout for the press for June 18, TEPCO stopped the entire water processing system manually when the surface radiation at the "skid" for removing oil and technetium exceeded 4 millisievert/hour, the limit set for replacing the zeolite cylinders (which TEPCO calls "vessel") inside the skid.

That "skid" contains 4 cylinders filled with SMZ (surfactant modified zeolite) to absorb oil and technetium. (The system diagram by TEPCO is provided below, with English labels added by me.)

The cause for the high radiation at the oil-technetium skid wasn't given in the handout, but in the press conference TEPCO listed the following as potential cause:

  • The radiation measurement device picked up the radiation from the pipe that transports highly contaminated water to the system; or

  • The water contained extremely radioactive sludge; or

  • The water contained too much seawater for the system to handle.

By the way, the skids were welded and fabricated by a company in Delta County, Colorado, called Industrial Systems, Inc.. According to the Delta County Independent's article on June 18, 2011, ISI has tripled the number of workers - welders, fabricators, machinists - to 75 to work 24/7 on the project, which for them now includes internal components for filter assemblies in addition to the skids.

Friday, June 17, 2011

#Fukushima I Nuke Plant: Contaminated Water Treatment System May Not Re-Start for Another Week, as Trench Water Rises

More on the news that TEPCO halted the system due to higher than expected radiation level in the cesium absorption subsystem by Kurion:

The radiation limit of 4 millisieverts/hour was reached in 5 hours, instead of one month as anticipated.

New information from Jiji News Japanese (12:47PM JST 6/18/2011):

  • The radiation level on the cesium absorption towers (cylinders) reached the limit [4 millisievert/hour] in 5 hours.

  • The limit was supposed to be reached in a month.

  • There is a possibility that the contaminated water contained the sludge with extremely high level of radioactive materials.

  • TEPCO hopes to investigate the cause and re-start the operation within a week.

TEPCO had better hurry. The water levels in the trenches leading from the Reactors 2 and 3 are rising again, even as the Ministry of Economy, Trade and Industry (METI) has stopped disclosing the information on water levels.

TEPCO discloses the water levels in the daily press conference handouts, and these are the numbers for the trench water levels measured from the top of the grating of the trench pit:

Reactor 2 trench pit:

6/17: 292 millimeters from the top of the grating
6/16: 337 millimeters
6/15: 321 millimeters
6/14: 304 millimeters
:
6/1: 332 millimeters
5/1: 840 millimeters

Reactor 3 trench pit:

6/17: 159 millimeters
6/16: 178 millimeters
6/15: 165 millimeters
6/14: 155 millimeters
:
6/1: 265 millimeters
5/1: 900 millimeters

The Reactor 2 pit water is about 30 centimeters from the top of the pit, the Reactor 3 pit water about 15 centimeters from the top of the pit.

#Fukushima I Nuke Plant: TEPCO Stopped Water Treatment System

The water treatment system for the highly contaminated water at Fukushima I Nuclear Power Plant has been stopped by TEPCO in the early morning of June 18. The system had been on the full "hot" run since 8PM on June 17.

The full run was halted in less than 6 hours due to high radiation level on the cesium absorption towers by Kurion.

The water treatment system is supposed to treat 1,200 tonnes of highly contaminated water every day, or 50 tonnes per hour.

From Yomiuri Shinbun (12:07PM JST 6/18/2011):

 東京電力は18日、福島第一原子力発電所の高濃度汚染水処理システムを同日午前0時54分に停止させたと発表した。

TEPCO announced on June 18 that it stopped the water treatment system for the highly contaminated water at Fukushima I Nuclear Power Plant at 12:54AM on June 18.

 東電は、装置などの故障ではなく、セシウム吸着装置の放射線量が想定より早く基準値に達したためと説明している。処理システムで浄化した水を原子炉に戻す循環注水冷却の同日中の実施は微妙な状況になった。

The stoppage was not due to system malfunction, TEPCO explained. The company stopped the system when the radiation level of the cesium absorption subsystem [by Kurion] had reached the set limit earlier than expected. TEPCO had planned to start the cooling water circulation system whereby the treated water is injected back into the Reactor Pressure Vessels on June 18, but it is not clear whether it will start as scheduled.

 セシウム吸着装置は集中廃棄物処理施設の中に設置されている。交換式の吸着剤が入った容器が6本1組で4列配置され、線量が毎時4ミリ・シーベル トに達すると吸着剤を交換することになっている。東電によると、システムは17日午後8時に本格稼働したが、遠隔操作中の作業員が、セシウム吸着装置の容 器表面の線量計の値が4・7ミリ・シーベルトになっていることに気づいた。

The cesium absorption subsystem is set up inside the Central Waste Processing Facility. There are 4 rows of 6 cylinders that contain cesium absorption material [zeolite], and when the radiation level reaches 4 millisieverts/hour the cylinders are to be replaced. According to TEPCO, the system started the full run at 8PM on June 17, but the worker who was remote-operating the system noticed that the radiation measurement device on the surface of the cesium absorption cylinders was 4.7 millisieverts/hour.

#Fukushima I Nuke Plant: Full "Hot" Run Starts at Contaminated Water Treatment System

After changing the "rupture disks" for the Kurion's part of the system and blaming the workers for closing the valve by mistake, TEPCO has started the full run, using "hot" water that they have in abundance (over 110,000 tonnes of it) at Fukushima I Nuclear Power Plant.

It must mean they were really running out of space to store the highly contaminated water, and have decided to run the full system made up of 4 different components by 4 different vendors (Kurion, Areva, Toshiba, Hitachi) with what looks to me like a very short test run. Or is this normal time-frame for a test run of the system like this? I'm no expert so I don't know for sure.

From TEPCO's handout for the press on June 17 (in Japanese only):

  • Kurion's system tested: from 3:45AM to 2PM, June 14 (10 hours and 15 minutes)

  • Areva's system tested: from 1:10PM to 8:35PM, June 15 (7 hours and 25 minutes)

  • Kurion+Areva tested: from 10:40PM, June 15 to 12:20AM, June 16 (1 hour 40 minutes)

  • Entire system tested: from 12:20AM to 7:20PM, June 16 when the system stopped (19 hours)

  • Entire system test resumed: from 1:00PM to ??? (NHK says the full run started in the evening, so 6 hours? making the total system test run of 25 hours)

If the "hot" water ever leaks like the low contamination water did (to the tune of 6 tonnes), I hope TEPCO and the participating companies have a plan ready to fix the leak.

Other potential Murphy moments would include:

  • Heavy rain

  • Seawater (neither Kurion's nor Areva's system has dealt with contaminated seawater)

  • Super "hot" radioactive sludge from the process, estimated to be 2,000 tonnes (no one knows what to do with them)

Even the cesium absorption towers (cylinders) need storage space after the run every day. TEPCO will need to replace one a day.

NHK World (6/17/2011):

A system to decontaminate highly radioactive water has gone into service at the Fukushima Daiichi nuclear plant.

The system is considered key to dealing with the build-up of contaminated water that is hampering work to bring the reactors under control.

Tokyo Electric Power Company, or TEPCO, activated the system on Friday evening after conducting final test-runs.

The utility earlier found water leaking from one of the system's 4 components -- a US-made cesium absorption device -- forcing the test-runs to be called off on Thursday.

TEPCO later determined that a mistakenly closed valve in the pipes had clogged the water, which then damaged a safety valve in one of the absorption units and caused the leak. The broken valve has been replaced.

Highly radioactive water is building up in reactor facilities at a rate of 500 tons per day. TEPCO hopes to cool the reactors by decontaminating the runoff and re-circulating the water.

Stable operations of the decontaminators will now be important, as the system has suffered glitches both before and during the test-runs.

Friday, June 17, 2011 20:51 +0900 (JST)

Thursday, June 16, 2011

#Fukushima I Nuke Plant: Kurion's System Leak Was Due to High Pressure in One of Cesium Absorption Towers

Accordingly, the safety valve, called the "rupture disk", ruptured as designed to release the pressure and let the water flow out, according to Asahi Shinbun (in Japanese; 12:01PM JST 6/17/2011).

Why did the pressure go up in that particular set of towers (most upstream of the 4 sets)? Because a valve was closed shut downstream. TEPCO hinted it may have been a human error, that a worker closed that downstream valve by mistake.

The total amount of water leaked was more than 6,000 liters [or 6 tonnes].

TEPCO will replace the ruptured "rupture disk" as well as the same disks for the other three sets of towers, and hopes to start the full run by midnight on June 17.

I was told by a former TEPCO nuclear plant engineer that something else is likely involved when the company wants to blame workers for a malfunction or an accident. We'll see if that's the case here.

The contaminated water situation must be getting really bad for TEPCO to hurry on with the full run that will process the highly contaminated water heavily mixed with seawater.

On the side note, Yomiuri Shinbun reports that the CEO of Areva, Anne Lauvergeon, will not be reappointed at the end of June, in the decision made by the office of the President of France, despite the urging by the company's executive board. Areva is 90% owned by the French government, and the CEO is rumored to have had disagreements with President Nicolas Sarkozy. The new CEO is going to be Luc Oursel, current COO of the company in charge of international marketing and projects. Oursel's name was missing in the letter by the company's executive board urging the reappointment of Anne Lauvergeon, as Reuters reports.

#Fukushima I Nuke Plant: Leak Found, Water Treatment System Test Run Halted

TEPCO was running the test of the entire contaminated water treatment system since 12:20AM JST, June 16, but the test has been halted because of the leak found in one of the cesium absorption towers after 19 hours of running the test. The company was planning to run the test with the low contamination water for 30 to 40 hours before the full operation of the system with the high contamination water.

It looks to be part of the Kurion system which uses a series of towers filled with zeolite to absorb radioactive cesium.

Murphy's still alive and well at Fukushima.

From Asahi Shinbun (12:30AM JST 6/17/2011):

東京電力は16日、福島第一原子力発電所にたまり続ける高濃度の放射能汚染水を浄化処理する施設の試運転中に、一部の装置から汚染水が漏れ出したこ とを明らかにした。装置は自動停止した。水が漏れた場所を見つけて修理するのに少なくとも半日はかかりそうだという。17日に予定する浄化施設の本格稼働 が遅れる可能性が高まっている。

TEPCO disclosed on June 16 that there was a leak in one of the subsystems during the test run of the entire water treatment system that will treat high contamination water at Fukushima I Nuclear Power Plant. The system was shut down automatically. According to TEPCO, it may take at least half a day to identify the location of the leak and repair. It is increasingly likely that the full-scale operation of the water treatment system, which is scheduled to start on June 17, will be delayed.

 水漏れがあったのは、施設のうち、放射性セシウムを吸着させる円筒形の装置。午後7時20分に警報が鳴って装置が自動停止した。午後8時ごろ、作業員が 直径90センチ、高さ2・3メートルほどの装置を入れた金属製の箱に30センチほど水がたまっているのを確認したという。さらに箱の外にまで汚染水が漏れ だしていた。

The leak was found in one of the cylindrical equipment to absorb radioactive cesium. The alarm sounded off at 7:20PM JST [on June 16] and the system was shut down automatically. At 8:00PM, the workers went in and visually confirmed the leaked water 30 centimeter deep inside the metal box that houses the cylinder, 90 centimeter in diameter and 2.3 meter in height. The water had spilled outside the box, too.

 原因について東電は「詳しくは調査しないと分からない」としている。

TEPCO said the detailed investigation was needed to figure out what had caused the leak.