Diposkan oleh Pengetahuan dan Pengalaman on Friday, September 2, 2011
Diposkan oleh Pengetahuan dan Pengalaman on Wednesday, August 31, 2011
東京電力は３１日、福島第一原発で高濃度の放射能汚染水を処理した機器の管理作業をしていた協力会社の作業員２人が、誤って放射能汚染水をかぶったと発表した。拭き取って汚染は取り除き、被曝（ひばく）線量は０．１４～０．１６ミリシーベルトだったという。
TEPCO announced on August 31 that two workers from TEPCO's affiliate company [could be two separate companies] got covered with contaminated water as they were conducting the control work of equipment used to process the highly contaminated water at Fukushima I Nuclear Power Plant. The contamination was wiped off, and the workers' radiation exposure was 0.14 to 0.16 millisievert.
東電によると、作業員は高濃度汚染水から放射性セシウムを吸着させた機器を保管する場所で、一人がはしごの上で機器の水抜き作業をし、もう一人がはしごを支えていた。３１日午前９時３５分ごろ、ホースを外したところ水が漏れ出たという。
According to TEPCO, the accident happened in the facility where the equipment that absorbed radioactive cesium from the highly contaminated water was stored. One worker was standing on the ladder draining water from the equipment and the other worker was holding the ladder secure. When the worker on the ladder removed the hose [for draining water] at about 9:35AM on August 31, the water leaked.
作業をしていた一人はかっぱを着用していたが、はしごを支えていた一人は不織布の防護服で、染みこんだ水が体に直接付着した。放射線測定器で、基準の１０倍近い値を計測した。口や鼻などから体内へ放射性物質を取り込んだ可能性はないという。
The worker [on the ladder] was wearing the water-proof jacket, but the worker who was holding the ladder was wearing the Tyvek suits only. The contaminated water penetrated the Tyvek suits and came in direct contact with the skin. The radiation survey meter showed 10 times the standard level. According to TEPCO, there is no possibility that the worker ingested radioactive materials through the nose or the mouth.
"かぶる" in Japanese means one gets covered with a substance falling from above. TEPCO hasn't tested what nuclides are there in the contaminated water during or after the treatment, and has said it has no plans to do so unless it is necessary (meaning when they are ordered to test by the regulatory agency NISA).
TEPCO's people who appear regularly on the press conferences often seem genuinely puzzled why they have to do certain things (like analyzing the treated water for beta radiation or analyzing the filter) without being specifically ordered by the government.
Diposkan oleh Pengetahuan dan Pengalaman on Friday, August 26, 2011
東京電力は２６日、福島第一原子力発電所の汚染水処理装置が一時的に停止したと発表した。
TEPCO announced on August 26 that the contaminated water treatment system at Fukushima I Nuclear Power Plant stopped temporarily.
放射性セシウムを吸着させる米キュリオン社製の装置から、仏アレバ社製の浄化装置へ送水するポンプが午後２時２１分に自動停止した。
The pump that transfer the treated water from Kurion's cesium absorption system to AREVA's co-precipitation system stopped automatically at 2:21PM.
処理装置が停止したのは、８月１２日に制御システムの信号異常に伴うトラブル以来。東電は何らかの原因でポンプに負荷がかかり過ぎたためと見て、詳しい原因を調べている。
The treatment system last stopped on August 12 due to the abnormal signal from the control system. TEPCO thinks the stoppage this time is due to too much load on the pump, and is currently looking into the cause.
Diposkan oleh Pengetahuan dan Pengalaman on Tuesday, August 23, 2011
Diposkan oleh Pengetahuan dan Pengalaman on Monday, August 22, 2011
東京電力は２２日、福島第一原発の高濃度の放射能汚染水を浄化する施設で、新たに導入した東芝製の装置「サリー」から毎時約３シーベルトという高い放射線量が観測されたため、部品交換できずに処理が停止していると発表した。
TEPCO announced on August 22 that a high radiation of about 3 sieverts/hour was detected at Toshiba's SARRY which was recently introduced as part of the contaminated water treatment system at Fukushima I Nuclear Power Plant. Due to the high radiation, TEPCO could not exchange parts [cesium towers], and the water processing [using SARRY?] had to be stopped.
東電によると、サリーは１８日に運転を始め、２２日朝からセシウムを吸着する部品を初めて取りかえる作業を行っていた際、配管の一部で高い放射線を観測した。線量を下げないと部品が交換できないため、東電は水で配管内の放射性物質を洗い流そうとしているという。
SARRY started the full operation on August 18. According to TEPCO, workers were exchanging the parts that absorb cesium for the first time in the morning of August 22, when they found a spot with high radiation on a pipe in the system. Unless the radiation level gets lower, the workers cannot exchange the parts. TEPCO is trying to flush out the radioactive materials in the pipe with water.
So, as with Kurion's system, Toshiba's SARRY also needs human intervention to exchange highly contaminated cesium absorption towers. Toshiba's towers supposedly have built-in lead sleeves inside the towers, but it is the pipe that's radiating 3 sieverts/hour radiation.
Oops. When it comes down to, it is the basic items like pipes, pipe fittings, hoses and pumps that give.
Diposkan oleh Pengetahuan dan Pengalaman on Saturday, August 20, 2011
Diposkan oleh Pengetahuan dan Pengalaman on Thursday, August 18, 2011
Diposkan oleh Pengetahuan dan Pengalaman on Sunday, August 7, 2011
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.
Diposkan oleh Pengetahuan dan Pengalaman
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.
Diposkan oleh Pengetahuan dan Pengalaman on Friday, August 5, 2011
Cesium-134: 5.5 million becquerels/cubic centimeter
Cesium-137: 6.27 million becquerels/cubic centimeter
They are much, much higher than the numbers below that TEPCO last announced (July 15) as the densities of radioactive materials in the water before the treatment:
Cesium-134: 1,500,000 becquerels/cubic centimeter (1.5 x 10^6)
Cesium-137: 1,700,000 becquerels/cubic centimeter (1.7 x 10^6)
Cesium-134: 5.5 million x 1000 x 700 = 3,850,000,000,000 or 3.85 terabecquerels
Cesium-137: 6.27 million x 1000 x 700 = 4,389,000,000,000 or 4.389 terabequerels
From Yomiuri Shinbun (1:04AM JST 8/6/2011):
東京電力は５日、福島第一原子力発電所の集中廃棄物処理施設の建屋内で、高濃度の汚染水約７００リットルがホースから漏れているのが見つかったと発表した。
TEPCO announced on August 5 that 700 liters of highly contaminated water was found leaking from the hose inside the Central Waste Processing Facility at Fukushima I Nuclear power Plant.
建屋外への影響はないが、水漏れが見つかるまで東電はこの汚染水の濃度を把握していなかった。安全管理のずさんさが改めて浮き彫りになった。
There was no effect on the environment outside the building. TEPCO hadn't tested the density of the contaminated water [at that location?] until the leak was found. It again raises the question of the effectiveness of TEPCO's safety measures.
東電によると、漏れが見つかったのは、汚染水処理システムで使われる吸着剤入り容器を洗浄した後、水を処理システムに戻すホース。この汚染水に含まれる放射性セシウム１３４の濃度は１立方センチ・メートルあたり５５０万ベクレル、セシウム１３７が６２７万ベクレルで、３、４号機タービン建屋の地下にたまった高濃度汚染水とほぼ同等だった。
According to TEPCO, the leak was found at the hose that routes the water used to flush the vessels [Kurion's system] back into the treatment system. Cesium-134 was detected at 5,500,000 becquerels/cubic centimeter, and cesium-137 was found at 6,270,000 becquerels/cubic centimeter. The level of cesium is about the same as that of the contaminated water in the basements of the turbine buildings at Reactors 3 and 4.
What? That's the level of contamination in the water in Reactors 3 and 4? That's news to me also. Water in the basements of Reactors 1 and 2 is considered even more radioactive.
Diposkan oleh Pengetahuan dan Pengalaman on Thursday, August 4, 2011
Water shields radiation. If there's no water [in the basement], the highly radioactive materials will be exposed. The radiation level at the surface of the contaminated water in the basement of the reactor building is 2 sieverts/hour, and the half value layer of water is about 19 centimeters, and the water is 4 to 5 meters [400 to 500 centimeters] deep...
It could be an outrageous level of radiation... I don't think they can empty the basement... Personally I think the melted-through fuel dropped through the ICM [In Core Monitor?] pipe or RPV drain to the bottom of [or below?] the pedestal, but no way of knowing how much of the fuel is there unless you go there and look.
Well, if a worker at the plant like me worries about it, I'm sure TEPCO and the government have already thought about it and come up with the solution. But that's my concern.
I've seen a smaller number (14 centimeters) for the half value layer of water.
I don't remember that the surface radiation level of the basement water was ever released by TEPCO. If anyone is aware, please let me know with the link.
Reactor 1 is where the 4 sievert/hour steam was seen gushing through the floor of the reactor building in early June. So, if the radiation on the water surface is 2 sieverts/hour, that's an improvement, I guess.
In the so-called "hot spots" in Fukushima Prefecture and the rest of Tohoku and Kanto, we're still talking in "microsievert/hour". At Fukushima I Nuke Plant, the "hot spots" are now in "sievert/hour". Remember the good old days when anything exceeding 100 millisievert/hour was considered extremely high at the plant?
Just the "new normal" in Japan, and life goes on, apparently.
Diposkan oleh Pengetahuan dan Pengalaman on Monday, August 1, 2011
お知らせ■本日（8/1）－8/5まで、設置工事が完了した第二セシウム吸着装置（サリー）の通水試験を実施する予定です。その後、国の確認をいただき、試運転を経て問題がなければ運用を開始する見込みです。
Notice: We finished the installation of the second cesium absorption unit (SARRY), and will conduct a flow test from August 1 to 5. After that, we will seek approval from the government, we will conduct the test run. If there is no problem during the test run, we will start the full operation.
Good luck, TEPCO and Toshiba.
Diposkan oleh Pengetahuan dan Pengalaman on Sunday, July 31, 2011
東京電力は３１日、福島第一原子力発電所の汚染水処理システムから、放射性物質を除去処理した後の塩水が、推定で約５０リットル漏出したと発表した。
TEPCO announced on July 31 that about 50 liters of saltwater leaked from the contaminated water treatment system. Radioactive materials had already been removed from the water.
塩化ビニール製の配管の劣化が原因とみられ、未明の地震による影響は考えにくいという。
According to TEPCO, the leak was probably due to the deterioration of the PVC hose used, and not the earthquake that hit the area in early morning.
水漏れが起きたのは、処理後の水から塩分を取り除く「淡水化装置」から、副産物としてできる高濃度の塩水をタンクへ送る配管。同日午前１０時５０分ごろ作業員が発見し、３０分後に装置を停止。配管を交換後、午後３時すぎに復旧した。原子炉への注水には支障はなかったという。
The leak was found at the hose that transports the highly-concentrated saltwater from the desalination unit to the storage tank. A worker found the leak at 10:50AM on July 31, and stopped the unit 30 minutes later. The PVC hose was exchanged, and the unit was back online at 3PM. The company said there was no interruption to water injection in the reactors.
また午前８時１３分ごろには、４号機の使用済み燃料一時貯蔵プールに水を送るホースから真水が霧状に漏れているのが見つかり、ホースを交換した。
Also, at 8:13AM, [a worker found] the hose that sends water to the Spent Fuel Pool of Reactor 4 was leaking, spraying water in fine mist. The hose was replaced.
These hoses are probably Kanaflex, which the manufacturer rushes to make and deliver to TEPCO as fast as possible.
So how salty is this water coming out of the desalination unit by Hitachi that made the hose deteriorate badly in slightly over a month?
From TEPCO's information on July 15, before the desalination (by reverse osmosis) the chlorine concentration is 8,000 ppm. After the desalination, this number drops to 19 ppm.
So, the saltwater that goes through the PVC pipe has 7,981 ppm chlorine.
Another one to file under the "things don't add up" category. Initially, TEPCO had blamed just about every leak to the sloppy job by the workers. Now the company hints at the poor quality of the PVC hose. Is it really the case, or is there still some information to be forthcoming later?
Diposkan oleh Pengetahuan dan Pengalaman on Saturday, July 30, 2011
Now, according to NHK News Japanese (7/31/2011), TEPCO is going to conduct a test run of the heat exchanger that it also finished installing for the SFP. The company hopes to lower the temperature of the SFP from the current 87 degrees Celsius to about 30, just like in Reactors 2 and 3.
The carbon-based workers had to carry everything up the stairs in full radiation protection suits and full face masks and do the work in high radiation. It'd better work, and it'd better be a step forward.
Next, a step backward:
One pump stopped at Kurion's unit of the contaminated water treatment system, and TEPCO decided to stop the transfer of the contaminated water from Reactors 2 and 3, as the Central Waste Processing Facility (where the water is stored before treatment) is nearing the capacity (20 centimeters from the limit), according also to NHK News Japanese (7/29/2011).
Hitachi's desalination unit is stopped due to a water leak, although the water treatment to remove radioactive materials continues uninterrupted.
And then, an enigma:
TEPCO conducted the air sampling from inside the Containment Vessel in Reactor 1, expecting the very high density of radioactive materials, but the result, after workers got max 5 millisieverts for the work on July 29, shows the air inside the Containment Vessel is just as clean/dirty as the air outside the Containment Vessel. TEPCO was expecting the air inside the CV to be 1,000 times as contaminated as the air inside the reactor building (but outside the CV).
So, what are the possible reasons as to why the air inside the CV is no different than the air outside?
TEPCO's Matsumoto thinks it may be because cesium tends to dissolve into water.
Or it could be that all that was inside the CV blew out and was gone when the reactor building blew up.
It could also be because the corium has long gone from the Containment Vessel and deep into the concrete (I hope) that it doesn't affect the air very much any more.
Remember TEPCO hasn't done (or released) the testing of the water in the basement of Reactor 1 reactor building, and that water was gushing in steam which measured 1,000 millisieverts/hour. Something very hot (temperature and radiation) is under that water.
TEPCO has been sending in workers to Reactor 1 regardless, to install the heat exchanger for the Spent Fuel Pool.
That, by the way, is another thing that hardly any information has been released by TEPCO: the SFP of Reactor 1. What's the radiation level of the water in the pool? What happened after the explosion? What's the temperature of the water? What happened to the spent fuels?
Diposkan oleh Pengetahuan dan Pengalaman on Wednesday, July 27, 2011
東京電力は２７日、福島第一原子力発電所で、高濃度の放射能汚染水を浄化する処理施設の稼働率が２週続けて５０％台になったと発表した。浄化した水 を原子炉に戻して燃料を冷やす「循環注水冷却」システムが動き出して２７日で１カ月だが、トラブルが相次いで停止が重なり稼働率が目標の９０％に達する見 込みはまだない。低迷が続けば、年末までに汚染水をゼロにする計画は難しくなる。
TEPCO announced on July 27 that the operating rate of the water treatment system at Fukushima I Nuclear Power Plant that treats highly contaminated water remained at less than 60% for two weeks in a row. It's been a month since the "circulation injection cooling system" which uses the treated water to cool the fuel in the reactors, but a series of troubles has caused the operating rate to be far below the target rate of 90%. If the rate remains low, the plan to reduce the amount of contaminated water to zero by the year end will be in jeopardy.東電によると、２６日までの直近１週間の稼働率は５８％で、前週の５３％からそう変わらなかった。運転開始から通算の稼働率も６３％で累積処理量は約３万トン。東電は当初、７月の稼働率を８０％と見込んでいた。その後７０％に下方修正したものの達成できない状況だ。
According to TEPCO, the operating rate for the week ended on July 26 was 58%, not much improvement from 53% of the previous week. The operating rate since the start of full operation is 63%, and the cumulative amount of treated water is about 30,000 tonnes. TEPCO had initially planned the operating rate in July to be 80%, but later lowered it to be 70%. The lowered target is not likely to be achieved.
８月からは９０％を目標にしようとしていたが、それも当面は７０％にとどめることにした。
The company planned to raise the target to 90% in August, but has decided to keep it at 70%.
このため汚染水は思うように減っていない。台風の雨や、処理施設の停止を補うためダムからの原子炉への注水が加わり総量は逆に約３千トン増えた。現時点で１２万６５０トン。汚染水を貯蔵する集中廃棄物処理施設も容量に近づいている。
The amount of contaminated water hasn't decreased as planned. With the rain from the typhoons and fresh water from the dam to supplement the treated water when the water treatment system was down, the total amount of contaminated water increased by 3,000 tonnes to 120,650 tonnes. The Central Waste Treatment Facility where the contaminated water is being stored is also reaching the capacity.
At this point, TEPCO must be hoping and praying that Toshiba's SARRY (photo below) will deliver, once operational in early August. With the lack of workers and the high radiation level inside the Central Waste Processing Facility, TEPCO may not be able to unclog the pipes in AREVA's system.
Diposkan oleh Pengetahuan dan Pengalaman on Sunday, July 24, 2011
Email notification from TEPCO: "The water treatment system at Fukushima I Nuclear Power Plant resumed operation at 9:40AM on July 24 but an alarm sounded at about 12PM, and the system has shut down automatically."
From the tweet of an anonymous worker at Fukushima I Nuke Plant:
The clogged-up pipes are at AREVA's system.
But during the July 24 morning press conference that I watched, TEPCO was rather vague about where the location of the clogged pipes:
(When asked about the location of the pipes clogged with sludge,) the section is after the oil separation unit.
Well, the oil separation unit by Toshiba is the first process which the contaminated water goes through, and that doesn't say much. The clogged part could be Kurion's system, or AREVA's system. Or it could be even at the water desalination unit by Hitachi, which seems to be having its own problem, according to NHK:
The desalination unit stopped on July 24 for about 7 hours. TEPCO switched to the backup unit and continued desalination.
The desalination unit that uses reverse osmosis needs the treated water to have a certain, low enough level of radioactive materials to function properly.
Minor details, but also at the July 24 TEPCO press conference, the amount of water being injected into the Reactor Pressure Vessels (Reactor 1, 2, and 3) fluctuates for unknown reasons. Responding to a female reporter from NHK who asked about the fluctuation in the amount of water into the RPV (did you know it fluctuated? I didn't), TEPCO answered:
Yes, it does fluctuate, and no we don't know the reason why, but we monitor the digital display at the pump and adjust the water flow accordingly. The alarm is set to go off when the amount of water being injected goes too low. In case of Reactor 1, it is set at 2.5 tonnes/hour.
I just have an unfounded, unscientific feeling that all these small details add up someday to cause a one big, unexpected something. Don't ask me what it is.
Diposkan oleh Pengetahuan dan Pengalaman on Saturday, July 23, 2011
福島第1原発事故で、東京電力は23日、高濃度の汚染水処理システムの流量が計画の毎時50トンを大幅に下回る37トン程度に減少している問題を解決する ため、内壁にのり状の汚泥が付着して流路が狭くなっている鋼鉄製配管100～200メートル分をルートから外し、ポリ塩化ビニール製ホースの「バイパス」 を設置することを明らかにした。
The contaminated water treatment system at Fukushima I Nuclear Power Plant has been suffering from the lower than designed throughput of 37 tonnes per hour instead of 50. On July 23, TEPCO disclosed a plan to create a 'bypass" using a PVC hose to divert the flow from going through 100 to 200 meters of steel pipes which are clogged with the sludge.
準備として同日、配管表面の放射線量を測定したところ、毎時50ミリシーベルトと高かったため、作業方法を検討している。
The company measured the radiation on the surface of the steel pipes in preparation of the work, and the radiation was high at 50 millisieverts/hour. TEPCO is considering how to proceed in the high radiation condition.
I think the PVC hose TEPCO is planning to use is an orange-colored hose that has been used throughout the plant, called "Kanaflex", which had an unfortunate rupture the other day.
Since TEPCO hasn't released the "survey map" (contamination map) of the plant since June 24, I don't know which pipe segment that TEPCO is talking about. The June 24 map shows the surface radiation of the pipes that transfer the contaminated water all exceeds 100 millisieverts/hour and as high as 210 millisieverts/hour.
Diposkan oleh Pengetahuan dan Pengalaman on Wednesday, July 20, 2011
Highly radioactive sludge that no one can touch. Or it could be rotten fish bits.東京電力は２０日、福島第一原子力発電所の汚染水処理システムの稼働率（１９日までの１週間）がこれまでで最低の５３％だったと発表した。
TEPCO announced on July 20 that the operating rate of the contaminated water treatment system at Fukushima I Nuclear Power Plant for the week ended on July 19 was 53%, the lowest ever since the system started the full operation.
東電は７月の目標稼働率を当初、８０％としていた。
TEPCO's target operating rate for July was 80%.
稼働率は、ほぼ１週間ごとに算出。稼働率が低迷しているは、システムに流せる汚染水量が毎時３７立方メートルと定格流量（毎時５０立方メートル）を大幅に下回っていることや、トラブルで停止したことが理由。流量がこのままでは、トラブルなしで連続運転できても稼働率は７４％にしかならず、東電は今後の処理目標の見直しもあるとしている。
The company calculates the operating rate every week. The reasons for the low operating rate are: low flow rate of 37 cubic meters (tonnes) per hour, instead of 50 cubic meters per hour as the system is designed, and stoppage due to various problems. At the current flow rate, even if there was no problem and the system could be run continuously, the operating rate would only be 74%. TEPCO says it is possible that the target for water treatment may be revised.
流量低下は、配管にたまった汚泥が原因と見られるが、現時点では原因を特定できていない。東電は今後、システムの改善を図り、２０日からの１週間で７０％、８月は９０％に稼働率を上げたいとしている。
The low flow rate may be caused by the sludge in the pipes, but at this point TEPCO hasn't been able to identify the cause. The company will try to improve the system somehow, and hopes to raise the operating rate to 70% during the week starting July 20, and to 90% in August.
Diposkan oleh Pengetahuan dan Pengalaman on Friday, July 15, 2011
東京電力は１５日、福島第一原子力発電所の汚染水処理システムの不調で、原子炉に注入する処理水が不足してきたため、約２週間ぶりに外部から真水を補給したと発表した。
TEPCO announced on July 15 that the company started to use the fresh water from outside source to supplement the treated water it has been using to cool the reactors for two weeks. The contaminated water treatment system at Fukushima I Nuclear Power Plant is not functioning well.外部の水を使うと汚染水の増加につながり、東電は不調の原因究明を急いでいる。
If the outside water is used, that will increase the amount of contaminated water. TEPCO is trying to identify the cause of the problem.
同システムは毎時５０トンの処理能力があるが、１２日までの１週間の実績は同３７トン。東電は、配管の一部に空気がたまるなどした可能性があると みて、１５日午前５時１４分にシステムを停止させ、空気抜きなどの処置を行った。午後２時２１分に再開したが、依然、同３９トンにとどまっているという。
The system can process 50 tonnes of water per hour. During the one week that ended on July 12, however, the rate was 37 tonnes per hour. TEPCO stopped the system at 5:14AM on July 15 to expel the air out of the pipes and restarted the system at 2:21PM, but the operating rate still remains at 39 tonnes per hour.
その結果、汚染水を処理した真水を蓄えるタンクの水量が満タン時の３５％に低下。東電は河川の水を約５７０トン補給し、６３％に回復させた。外部の水を足せば汚染水が増える。
As the result, the amount of treated water in the storage tank has dropped to 35% of the full capacity, so TEPCO replenished the tank with 570 tonnes of river water to bring it to 63% capacity. If outside water is added, the contaminated water will increase.
Let's see..
63 minus 35 equals 28.
570 tonnes equal 28% of the capacity.
So the tank holds 2,035 tonnes.
Hmmm, the number doesn't match up with the information on TEPCO's drawing, which shows the storage tank to have the capacity of 5,000 tonnes and the buffer tank that can mix river water with contaminated water if needed has only 1,000 tonnes capacity. There is no tank with 2,000 tonnes capacity in the drawing...
Diposkan oleh Pengetahuan dan Pengalaman on Thursday, July 14, 2011