Science,English,and math １１th
I will start from now on
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【The atomic power plant in Hamaoka】
《The energy on the earthquake has already been accumulated》
157 years have passed from the last earthquake in Tokai area. It means that the assumed center of the earthquake in Tokai area has accumulated energy which makes the earthquake of which magnitude is 8 at present. It's the ground that the earthquake on Tokai areas is impending.
When looking over the Japan Archipelago there is hardly other place like Tokai area where the outbreak on the earthquake is set to happen concretely and its scale is over magnitude 8.
Needless to say, there is the risk...
【The atomic power plant in Hamaoka】
Needless to say, there is the risk on the earthquake in the other atomic power plants, but its risk on the one in Hamaoka is by far bigger than any other ones.
《When will it break out? 》
When will the big earthquake occur in Tokai area concretely? Is it today or after thirty years? No one can foresee it. What makes the earthquake happen? it remains unclear, and how is the plate on the boundary underground? No one knows it.
The one which makes the situation be complicated is there has been none of the cases in which the single big earthquake broke out...
【The atomic power plant in Hamaoka】
《When will it break out? 》
The single big one has never broken out in Tokai area as long as the author knows, he said like that. When the big one happens, it worked with other plates together.
The boundary continues on the west of the assumed center of the earthquake, and the earthquake of which location of the center of the earthquake is offing in Mie prefecture and is the offing from Wakayama prefecture to Shikoku area broke out repeatedly in the past.
For example, the one in 1707 was two areas worked together and in 1854, two of them worked ...
【Atomic power plant in Hamaoka】
《When will it break out？》
...in 1854 two of them worked together, to make matters worse, the third one broke out after thirty-two hours.
In 1946, 南海地震 of which location of the center of the earthquake is from Wakayama prefecture to Shikoku area broke out, but then in the location of the center of the earthquake on 東海地震, none of the earthquake broke out then.
There is none of the case in which the big single earthquake didn't broke out in the past in Tokai area, and other two of the big earthquakes worked together, so there have been some seismologists ...
【Atomic power plant in Hamaoka】
《When will it break out？》
...so there are some seismologists who have insisted that the big earthquake in Tokai area will work with other two together.
If the big earthquake in Tokai area breaks out with other two together, we know the time when the two of the earthquakes breaks out, we can foresee the time when the big earthquake in Tokai area break out as well logically.
But except for the big earthquake in Tokai area, it has never been clear the time when two of the other big earthquakes occur.
It seems that it occurred with the interval from a...
【Atomic power plant in Hamaoka】
《When will it break out? 》
We know it seemed it broke out with the interval from a hundred to a hundred and fifty-years, according to the historical archive. Considering the last outbreak in 1944 and 1946, the time has been given until the next outbreak, but we can't deny the possibility it will occur with shorter interval than before.
In addition, we can't deny other possibility that the big single earthquake which has accumulated enough energy in Tokai area will break out in the future.
The earthquake offing in the Pacific Ocean on Tohoku area has...
【Atomic power plant in Hamaoka】
《When will it break out？ 》
The earthquake offing in the Pacific Ocean at Tohoku area has made us informed painfully the assumption being based on limited knowledge by the humankind was overturned easily by the nature this time.
Mr.Kan incited the probability on the earthquake in Tokai area in the future is 87%. It was led by the committee on the research for earthquake established by the educational Ministry statically.
When will the big earthquake break out? if being asked like that, we are forced to answer we don't know after all, but it's the fact that...
【Atomic power plant in Hamaoka】
...but it's fact that the location on the center of the earthquake in Tokai area has accumulated enough energy to break out the earthquake of which magnitude is 8.
《Having been worried about the outbreak on the tidal wave which is beyond the present assumption》
Those things have already been clear before the earthquake offing in the Pacific Ocean at Tohoku area broke out. Even if the big earthquake breaks out in Tokai area, we assume that the atomic power plant in Hamaoka would be operated safely until the big earthquake broke out this time in Tohoku area.
【Atomic power plant in Hamaoka】
《Having been worried about the outbreak on the tidal wave which is beyond assumption at present》
So the operation on the atomic power plant in Hamaoka could have been continued, but the prime minister demanded to stop operating the atomic reactor, for he would think of danger which is bigger tidal wave beyond assumption attacks the atomic power plant in Hamaoka.
It seems that he judged that there is the possibility that the same thing in the atomic power plant in Fukushima will break out in Hamaoka as well.
The big earthquake broke out in 1854. Then two ...
【Atomic power plant in Hamaoka】
《Having been worried about the outbreak on the tidal wave which is beyond assumption》
Then two of the earthquakes worked together and the height on the tidal wave which was the highest was 6 meters, judging from the trace on the tidal wave, according to data in Chubu Electric Company, so estimating the tidal wave of which highest wave was 8 meters so as to keep the safety.
There are dunes of which height is from 10 to 15 meters on the site of the atomic reactor in Hamaoka along the coast. The dune will play a part as natura embankment.
But having...l
【Atomic power plant in Hamaoka】
《Having worried about the outbreak on the tidal wave which is beyond assumption》
But as having responded with the nuclear disaster in Tohoku area, Chubu Electric company has taken a new measure of setting new generators in emergency on the roof of the building for the atomic power generation.
Even if stopping supplying electricity from the outside, going on cooling down on the atomic reactor and the spent nuclear fuel becomes possible. Or setting other two generators at the high place on the site of the atomic power plant, furthermore, building embankment....
【Atomic power plant in Hamaoka】
《Having been worried about the outbreak on the tidal wave beyond assumption》
...moreover, building the embankment wall of which height is at least more than 12 meters inside the dune. Taking a few years to complete it has been decided.
If a bigger tidal wave beyond assumption until then breaks out before those construction is over, the safety can't be maintained, Mr. Kan judged like that, so he demanded to stop operating the atomic reactor this time.
Is there possibility that bigger tidal wave occurs beyond assumption in the big earthquake in Tokai area ?
【Atomic power plant in Hamaoka】
《Having been worried about the outbreak on the tidal wave beyond assumption》
I'm not sure of it at present situation, the author said like that.
If being able to solve out the mechanism which caused the big earthquake this time offing in the Pacific Ocean at the Tohoku area, we may have got something suggestive.
If assuming the possibility that the first earthquake breaks out and after dozens of minutes other earthquake occurs, the tidal wave on both of the earthquake are overwrapped and the height on the tidal wave becomes higher.
In the worst case...
【Atomic power plant in Hamaoka】
In the worst case, calculation on the height of the tidal wave is over 10 meter near Omaezaki where there is the atomic power plant in Hamaoka was reported.
《Is there enough measure against shaking? We have to consider it》
Generally, it has been considered that the pump for cooling down broke down and the generators in emergency was out of order owing to the tidal wave in Fukushima.
Isn't there any fault owing to the shaking at all? It's very important.
Putting into the control rod was done safely so as to stop the reaction on nuclear fission.
【Atomic power plant in Hamaoka】
《Is there enough measure against shaking? We have to consider it》
Putting the control rod into the nuclear reactor was done safely in emergency, but whether or not the function on the whole facility like plumbing was safe against the shaking should be solved out thoroughly in the future.
Inspection against the seismic standard is also indispensable in the atomic power plant.
In the disaster by the earthquake this time, the shaking which excessed the seismic standard so much is observed this time in other atomic power plant. The shaking beyond the...
【Atomic power plant in Hamaoka】
The shaking beyond measure so much was observed sometimes at some of atomic power plants so far.
《Having influence over the policy on energy in the future》
The number on the atomic reactor in the whole Japan is 54 and the ration in which the atomic power plant accounts for in the whole amount of the electric power reached around 25%.
The atomic disaster in the nuclear power plant in Fukushima and stopping operation on the atomic reactor in Omaezaki will have influence a lot over the policy on energy in the future.
【The route to decommissioning】
【The route to steep decommissioning】
《How do we take out the melting nuclear fuel? What is the lots of themes standing in front of us? 》
The atomic power plant in Fukushima prefecture which has caused the nuclear power disaster. Various works continued so as to come to an end the disaster completely June in 2011 when this description was done.
The atomic reactor which caused the disaster has determined to decommission finally, it has been clear that meltdown was done and it turned out that the route to decommissioning is steep.
How is the decommission going to be done? and what's kind ...
【The steep route to decommissioning】
《How do we take out the melted nuclear fuel? What are the lots of themes stand in front of us? 》
...and what kinds of theme is there? The atomic power disaster broke out at the Three Mile Island in America some forty years ago.
The author said he was going to express the decommissioning in detail, using the disaster in Three Mile Island as reference.
After four months from the disaster in the atomic power plant in Fukushima, it didn't come to an end then.
It proved that the meltdown that the nuclear fuel melted by heat broke out in the atomic reactor.
【The steep route to decommissioning】
《How do we take out the melted nuclear fuel? What are the lots of themes standing in front of us? 》
Meltdown that nuclear fuel melted by the heat broke down from the first to the third atomic reactor, according to the announcement by the Tokyo Electric Power Company May in 2011.
In addition, the melted nuclear spent fuel destroyed the pressure vessel which contained the nuclear fuel and was pointed out that the possibility that the part of the nuclear fuel flowed out beneath the pressure vessel.
Lots of the people were engaged in the work in...
【The steep route to decommissioning】
《How do we take out the melted nuclear fuel? What are the lots of themes standing in front of us? 》
Lots of people were engaged in the work so as to come to and end the unprecedented disaster as early as possible. The work was going to be done, being based on the schedule by the Tokyo electric power company updated May in 2011. Five items are being set up and is showed to work on them in order to come to an end the disaster perfectly.
One of the big themes is cooling down the atomic reactor. Even if being stopped, inside the atomic reactor has to be...
【The steep route to decommissioning】
《How do we take out the melted nuclear fuel? What are the lots of themes standing in front of us? 》
Even if being stopped, inside the atomic reactor has to be remained cool, but after the big tidal wave attacked, the existing system for cooling down couldn't function owing to the influence by the tidal wave. As a result, being unable to cool down the atomic reactor, so the serious disaster broke out this time.
The nuclear fuel continued to give off the heat in the atomic reactor even if after four months passed from the disaster, so pouring water of 1...
【The steep route to decommissioning】
《How do we take out the melted nuclear fuel? What are the lots of the themes standing in front of us? 》
...so, pouring 1 ton of water an hour continued, but part of the pouring water leaked underground on the building of the atomic reactor.
A new system purifying the polluted water which was accumulated in the atomic reactor and circling the purifying water and continues to cool down has been developed.
If the system functions enough, the temperature on the water which cools down the nuclear fuel can keep low. It's the goal for the time being.
【The steep route to decommissioning】
《How we take out the melted nuclear fuel? What are the lots of themes standing in front of us? 》
It's the goal for the time being.
Other item being on improvement on the circumstance like restraining the pollution by the radioactive material which leaked from the atomic reactor, decontamination, its monitoring, the measure after the shock has established.
Those things have to be done steadily so as to come to an end on the disaster.
《Decommissioning which takes a long time and needs labor》
At least from the first to the fourth atomic reactors have...
【The steep route to decommissioning】
《Decommissioning which takes long time and needs effort》
From the first to the fourth atomic reactor which caused the accident have to be decommission finally. Decommission means dismantling the atomic reactor and disposing of it. In Japan, decommission is done in Ibaragi and Fukui prefecture.
JPDR which is an abbreviation of Power Demonstration Reactor. It's a small atomic reactor for study which succeeded in generating electricity by atomic power in Japan for the first time. Its decommission was done from 1981 to 1996. Various expertise needs on the...
【The steep route to decommissioning】
《Decommissioning which takes long time and needs efforts》
Decommissions needs various expertise like handling radioactive material, and technical skill on dismantling atomic reactor.
Decommissioning on the JPDR was done developing the technical skill on dismantling, one of specialists said like that.
Whether or not the accident happened, the most tiresome when going ahead the work is the existence on the radioactive material.
When dismantling the atomic reactor, we need to the radioactive material prevents from scattering around. We have to prevent...
【The steep route to decommissioning】
《Decommissioning which takes long tie and needs efforts》
We have to restrain being exposed to radiation on workers in decommissioning to the bottom line. Considering it, ordinary decommission is done with the procedure like the next.
After stopping operating the atomic reactor, making the cooling water circulate, and dropping the temperature on the nuclear fuel. After waiting for the temperature drops enough, taking out the nuclear fuel and sending the nuclear fuel to the facility where the nuclear fuel is treated.
In the next, decontamination is...
【The steep route to decommissioning】
《Decommissioning which takes long time and needs efforts》
In the next, decontamination is done.
The radioactive material is attached to the pressure vessel and to the plumbing where the cooling water passes through. Decontamination is washing, getting rid of the radioactive material by medicine.
Impurity included in the cooling water received strong radiation which means strong neutron beam from the core, so the pressure vessel and plumbing were exposed to radiation, and the radioactive material was caused.
The pressure vessel and the surface...
【The steep route to decommissioning】
《Decommissioning which takes long time and needs efforts》
The pressure vessel and its surface covering with concrete learn to have the radioactivity, for the material on the pressure vessel and the concrete include chemical elements like cobalt and chromium.
When burning. a large amount of neutron is caused, and the neutron bumps against the cobalt and chromium, they change into radioactive material.
The one which isn't the radioactive material originally changes into the radioactive material is called radiation, but this kind of radiation happens...
【The steep route to decommissioning】
《Decommissioning which takes long time and needs efforts》
...but this kind of radiation happens in the atomic reactor in which the neutron beam is caused alone. The radioactive ray which issues from other radioactive material like radioactive iodine or radioactive cesium doesn't give off the neutron ray, so radiation doesn't happen.
After decontamination is over, the plumbing and pump which are used in emergency have low radiation, so dismantling them at once is possible .
As to the ones which have strong radiation, we sometimes wait for the...
【The steep route to decommissioning】
《Decommissioning which takes long time and needs efforts》
As to the ones which have strong radioactivity, we sometimes wait for the amount of radiation to drop for several years, automatically.
The pressure vessel is shut up tightly in container vessel which covers the outside, and the container vessel is in the building made up with concrete for the atomic reactor.
What should we decommission the atomic reactor which stops its operation in without any flaw?
At first dismantling the pressure vessel in the container vessel and doing the container vessel
【The steep route to decommissioning】
《Decommissioning which takes long time and needs efforts》
After the container vessel is dismantled, the building is done finally, giving great attention to avoid leaking the radioactive material, the dismantling is done, but the decommissioning on the atomic power plant in Fukushima is different from the ordinary work so much, for melting down made the container in the atomic reactor destroy, so ordinary washing technical skill isn't able to be used, taking out the nuclear fuel doesn't go ahead as planned.
Keeping the cooling water which cools down...
【The steep route to decommissioning】
《Decommissioning which takes long time and needs efforts》
The way to keep cooling water which cools down the nuclear fuel low is described in the schedule announced by the Tokyo electric company, but a concrete way of decommissioning isn't indicated.
Companies which are engaged in the atomic power plant in Japan proposed they decommission in cooperate with other companies in foreign countries for a few decades.
The specialist who has studied the atomic reactor and its security said the way of treating the nuclear disaster at the Three Mile Island in...
【The steep route to decommissioning】
...the way of treating nuclear disaster at the Three Mile Island is good as reference. What is the nuclear disaster at the Three Mile Island?
《The atomic power plant in the Three Mile Island which caused melting down》
Some of disorder in facility and mistakes by workers overlapped, and it led to the big disaster like the melting down.
As being unable to cool down the cooling water at the container vessel , so the temperature in the water went up at the second atomic reactor in the Three Mile Island May in 1979.
As a result, the steam in the ...
【The steep route to decommissioning】
《The atomic power plant in the Three Mile Island which broke out meltdown》
As a result, the steam made the pressure in the pressure vessel went up. As being ready for the situation, a valve which makes steam escape from the apparatus on 加圧器 which controls the pressure on the atomic reactor to the pressure vessel.
The atomic reactor stopped in emergency, at the same time, the valve opened automatically and the pressure in the atomic reactor began to drop, but a problem happened then.
After the pressure went down, the valve which should shut
【The steep route to decommissioning】
《The atomic power plant in the Three Mile Island which broke out meltdown》
...the valve which should shut automatically was out of order and remained open.
To make matters worse, the facility indicated the valve was shut, so workers couldn't be aware that the valve was open.
The cooling water changed into steam and continued to escape to the container vessel. As a result, water level in the pressure vessel went down.
As detecting the unusual situation, ECCS, Emergency cooling core system functioned. ECCS is the apparatus which cools down nuclear fuel.
【The steep route to decommissioning】
《The atomic power plant in Three Mile Island which broke out meltdown》
Pouring water started so as to go up the water level by the ECCS, but unfortunately, a new mistake was made then.
A worker who wasn't aware that the valve escaping the pressure was open judged that the pressure vessel was filled with the water and stopping operating the ECCS by manual operation.
As the valve escaping pressure was open, the water level went down lower and lower in the pressure vessel.
Two hours and twenty minutes passed from the accident, the worker found out...
【The steep route to decommissioning】
《The atomic power plant in the Three Mile Island where the meltdown broke out》
...the worker found out the situation finally, so the main valve which was beneath the valve escaping pressure was shut then, but the cooling water in the pressure vessel decreased so much that two thirds of the whole nuclear fuel was exposed from the surface on the water. Then the nuclear fuel melted by its own heat and melting down broke out.
When the nuclear fuel exposed from the water there is possibility that hydrogen appears. Metallic tube enveloping the nuclear fuel...
【The steep route to decommissioning】
《The atomic power plant in the Three Mile Island where melting down broke out》
Metallic tube enveloping the nuclear fuel reacts with steam and hydrogen is caused, so the hydrogen was accumulated in the pressure vessel.
The large amount of steam and the pressure by the hydrogen in the pressure vessel prevented from pouring water, so releasing the steam and hydrogen into the container vessel and the work was proceeded, and as a result, the container vessel was filled with hydrogen.
After some ten hours from the disaster, the hydrogen caught fire and...
【The steep route to decommissioning】
《The atomic power plant in Three Mile Island where meltdown broke out》
Hydrogen caught in fire and explosion by the hydrogen broke out then, but the containment vessel didn't break down by the explosion, but the similar phenomenon also occurred in the nuclear power plant in Fukushima.
The hydrogen leaked from the containment vessel to the building for the atomic reactor and caught in the fire. As a result, the explosion by the hydrogen blew up the building, and then a large amount of radioactive material was released around the place.
【The steep route to decommissioning】
《The atomic power plant in the Three Mile Island where the meltdown broke out》
There is possibility of hydrogen is left in the atomic reactor in the nuclear power plant in Fukushima where the work for handling the disaster at present. Pouring nitrogen and setting up apparatus which return the hydrogen to water and be careful not to cause the explosion by the hydrogen is indispensable, one of experts said like that.
After some 16 hours, enough cooling down became possible at the nuclear power disaster in the Three Mile Island, the disaster was going...
【The steep route to decommissioning】
《The atomic power reactor in the Three Mile Island where meltdown broke out》
...so the disaster was going to come to an end. It turned out that some 50% of the nuclear fuel melted finally in the disaster.
On the other hand, the gigantic tidal wave destroyed the way of cooling down like the ECCS, emergency core cooling system, even if three months passed from the disaster, the disaster didn't come to an end then.
To make matters worse, accidents broke out in other some of atomic power plants, and it becomes an obstacle for coming to an end earlier.
【The steep route to decommissioning】
《The atomic power plant in the Three Mile Island where meltdown broke out》
INES is an abbreviation on International Nuclear Event Scale. How serious it is, is expressed with the number on the INES. According to the INES, the atomic power plant disaster in the Three Mile Island is level 5.
On the other hand, the one in Fukushima is level 7 tentatively. It's the most serious. The difference between the two of the atomic power disaster is the scale on the influence which given outside the atomic power plant.
《Getting rid of the radioactive material...》
【The steep route to decommissioning】
《Getting rid of the radioactive material at the atomic reactor in the building》
As the nuclear fuel melted at the nuclear power disaster in the Three Mile Island, a large amount of radioactive material included in the nuclear fuel leaked into the pressure vessel. Then as the steam and hydrogen were released from the pressure vessel, the radioactive material was attached everywhere in the atomic power plant.
As a result, the amount of radiation inside the containment vessel was high immediately after the disaster.
The radioactive material leaked from...
【The steep route to decommissioning】
《Getting rid of the radioactive material in the building》
The radioactive material leaked from the nuclear fuel is a large amount, and removing the radioactive material is indispensable so as to handling matters after the disaster. Then restraining to be exposed on the radiation to workers and preventing the radioactive material from scattering neighborhood would be done.
But decontamination on the atomic reactor after the accident has never been done until then, so examining the way of getting rid of the radioactive material was done, and....
【The steep route to decommissioning】
《Getting rid of the radioactive material in the building》
Decontamination was done actually and making sure its efficiencies actually. It's like a large scale of experiment on decontamination. It was done in 1982.
The most efficient is spraying water on the floor, wall, or the surface on the apparatus with high pressure, and scraping off all of the surface.
Scraping off the floor by 1.6 millimeters with the way and getting rid of the radioactive material. The amount of the radiation became one tenth from the one in 1980.
The radioactive material...
【The steep route to decommissioning】
《Getting rid of radioactive material in the building》
Radioactive material could have attached everywhere at the atomic reactor in the atomic power plant of Fukushima where the disaster broke out, for the high amount of radiation has been measured inside the building by robot controlled from remote place. A measure of obstructing radioactive material is done and the work on decontamination has to be proceed, referring to the experience on the atomic power plant disaster in the Three Mile Island.
《Taking out the nuclear fuel is the hardest》
【The steep route to decommissioning】
《Taking out the nuclear fuel is the hardest》
If the work becomes easier by decontamination the work of taking out the nuclear fuel will start in the next, but taking out the nuclear fuel is the most difficult when dealing with the atomic reactor which caused meltdown, the specialist said like that.
When taking out the melted nuclear fuel, being unable to use an ordinary instrument for taking out the nuclear fuel which isn't melted. Moreover, the melted nuclear fuel gives off strong radioactivity, so taking out is very hard.
How was the melted...
【The steep route to decommissioning】
《Taking out the nuclear fuel is the hardest》
How was the melted nuclear fuel in the pressure vessel? It was examined by ultrasonic at first in the Three Mile Island.
One third on the core became a big hollow in the upper part, and melted nuclear fuel changed into minute particles and accumulated in the lower part of the core.
The melted nuclear fuel solidified and changed into the shape of huge egg in the center on the lower part.
The nuclear fuel was in the special situation, so the special instrument was developed so as to take out the nuclear fuel.
【The steep route to decommissioning】
《Taking out the nuclear fuel is the hardest》
If taking out of the nuclear fuel, opening the lid on the pressure vessel on the upper part, and the work is done usually.
But as strong radiation gave off, two of plates made of stainless of which thickness was 3.5 centimeters were put on the upper place of the pressure vessel and blocking off the radiation. There was a space on the plate and a crane was lowered down from there, and the work was done.
The nuclear fuel in the pressure vessel was varied like minute particles, and a big mass. Flakes and...
【The steep route to decommissioning】
《Taking out the nuclear fuel is the hardest》
Flakes and wreckage which covered the nuclear fuel was also accumulated.
The tip on crane of which shape was varied was prepared so as to dig out and to break.
As to the container which gathering the nuclear fuel, we can't use a made up article as it is.
By the way, I'm tired a little and I can't continue any more today. I'm sorry for it. Please have a nice evening, the readers who read my expression. I'm grateful for you to read my response every time.
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【China has collected Hong Kong】 …(燻し銀三)
500レス 4312HIT 燻し銀三 (60代 ♂) 名必
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こんな考え最低ですか？婚約中
料理教室の講師をしてる32歳女です。相談所で出会った52歳の経営者と成婚退会しました。お互い初婚です…
33レス 1569HIT 恋愛勉強中さん (30代 女性 ) -
ベビーカーの周りに家族が不在
交通機関のターミナルでの事です。 待合所の座席にほとんどお客が座っている中、通路側の端の席に荷物が…
20レス 304HIT 匿名 ( 女性 ) -
飲み会で言われた失礼な発言が許せない
先月、職場に新人が入ってきました。 実は前働いていた職場の後輩で、たまに話したりはする程度の人でし…
16レス 391HIT 相談したいさん (30代 女性 ) -
婚活で出会った人を信用する方法
どうやったら彼を信じられますか？婚活を続けて、ようやく素敵な方と出会い、お付き合いを開始しました。た…
8レス 238HIT 恋愛好きさん (30代 女性 ) -
友達ってなんだろう
友達に恋愛相談をしていました。 僕は人間関係が苦手な面があるので脈ナシで相手にされずなところがあり…
42レス 970HIT 匿名さん -
この世の中に、そして宇宙にあるものは
万物において、一長一短を持っているとゆうのが定理で、 たとえば、 「都会」 「イナカ」 この…
11レス 190HIT おしゃべり好きさん - もっと見る
