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the story so far, full version
What Fukushima's Triple Meltdown Means
love this line
Tokyo Electric Power Company (TEPCO) has said there have very likely been partial meltdowns at the other two reactors that were operating when the crisis began on March 11 as well. A spokesman for TEPCO, Japan's largest power company that has come under fire for its management of the crippled plant, said fuel rods at reactor No. 3 started melting March 13, two days after the 9.0 earthquake and ensuing tsunami struck the plant. Fuel rods at No. 2 probably started melting a day later, on March 14.
When the nuclear plant entered its state of emergency, the fuel rods inside these reactors began to melt from their upright position and slump down to the bottom of their containers, or pressure vessels, which are designed to keep them sealed up and isolated. That's a problem because the nuclear fuel in a state of meltdown can, in the worst-case scenario, burn through its container and the plant infrastructure to leak into the ground around the facility. That, as Eben wrote here last week, is known as a ‘China Syndrome,' and that's what we want to avoid.
Fortunately, it appears for now we have dodged that bullet, and the not-great-but-not-apocalyptic news du jour is that the meltdowns at Nos. 2 and 3 are not as bad as what occurred at No. 1. About 35% of the rods at 2 and 30% of the rods at 3 were damaged, compared to a near total meltdown at 1. A TEPCO spokesman said on Monday that while those melted fuel rods inside 2 and 3 are still sitting at the bottom of their containment vessels, they are covered in water and stable, and damage to the vessels is “limited.” The situation at No. 1 is the more critical: the fact that water levels inside the vessel are believed to be low indicates the slumped fuel may have permeated the vessel, creating holes through which contaminated water may be leaking into the plant.
Minimizing the damage to the nuclear fuel rods inside the damaged reactor buildings has been the highest priority of TEPCO and the Japanese government since this crisis began to unfold more than two months ago. When the earthquake and tsunami wiped out the main electricity, generators, and backup battery systems at the plant designed to keep the cooling reactors' cooling systems online, the race to find ways to keep the fuel cool was one. Some tactics – like having helicopters attempt (and mostly fail) to dump water over a reactor from the air – were designed more for PR than for practicality.
But in general, pouring water into the reactor cores has done what it's supposed to. Temperatures inside the reactors are still too high to stop cooling them, but they are stable enough that fuel is no longer melting. The highest levels of radiation were released into the atmosphere in the early days, too, when at least two and possibly three hydrogen explosions, the result of the building up of heat and steam inside the cores, occurred in the reactor buildings, releasing radioactive material into the atmosphere. It was also during those first days after the disaster that TEPCO, at the insistence of Kan's government, opened a vent in reactor 1 to relieve building pressure inside the building and prevent an explosion. (TEPCO hesitated to do so because the subsequent release of radiation into the atmosphere would push this crisis into Chernobyl territory. Too late.)
So why does the bad news from Fukushima keep coming? The utility says it is only starting to understand what it's dealing with. The problem with a nuclear accident is that the damage gets done early, and fast. Even after the makeshift cooling system started to work, TEPCO knew there was damage to the fuel inside the reactors, but, they say, it wasn't until radiation inside the reactor buildings dropped to safe enough levels for workers to go in and take measurements that the company could start to ascertain the problem. Some have argued that the release of the information was timed to have the least impact, now that life in Japan has started to get back to normalcy. “The situation will gradually be getting better,” says Dr. Bing Luk, TITLE TK. “As long as they keep the system cool, then it will just stay as is. In a few years, maybe they can start thinking about retrieving some of the fuel rods.”
That won't be happening anytime soon. If the fuel rods were intact, Luk says the standard machinery used to handle them could go in, pluck them out of the containment vessels and stick them in the spent fuel pools where fuel rods go to die. But as we've established, they're not intact, so instead TEPCO will have to leave the rods in situ while they lose potency. “If you can give them more time, the material will become less hot — both in terms of temperature and radioactivity,” Luk explains. Enter TEPCO's plan to build a containment structure around the plant by the end of the year. The structure, which would be a precursor to a more permanent one, would contain the low levels of radiation that are still leaking from the plant while the figure out how to get the melted fuel out of the reactors.
For now, barring any significant discovery of a breach in one of the vessels or a major leak into the environment, the discouraging news trickling out of the plant doesn't mean things are actively getting worse. It just means we're finding out how bad they are.
Read more: ecocentric.blogs.time.com...
in other words we know we just do not want to say so,not yet.
For now, barring any significant discovery of a breach in one of the vessels or a major leak into the environment, the discouraging news trickling out of the plant doesn't mean things are actively getting worse. It just means we're finding out how bad they are.
This is your thread in an open-community forum. I am free to post my opinion.
Originally posted by Bob Sholtz
reply to post by unityemissions
it is interesting you say you will "check up on me" after posting:
This is your thread in an open-community forum. I am free to post my opinion.
do as i say, not as i do, eh?
now that we know that there are 3 in melt down any one care to do the math???
apan has been hit with triple wave of devastation. First, the mega-quake at Sendai, then the cataclysmic tsunami, and now the potential for a meltdown of at least one, maybe two reactors. The death and destruction is testing a nation known for its resilience and resolve. Let us hope and pray that the nightmare of a nuclear meltdown does not materialize.
Three reactors at the Fukushima Daiichi nuclear complex are at risk of over heating and meltdown. The complex is 240 Km north of Tokyo. American Physicist Michio Kaku, whose parents were born in Japan, commented on the gravity of the situation on Saturday, March 12th. He described efforts to control the risk as “driving a car without brakes, which is out of control.” Explosions in the containment building forced the utility to expand the evacuation radius from 2 miles to 6 miles to 12 miles. If efforts to keep the nuclear rods cool fail, a full scale meltdown would be inevitable and would occur over a period of 30 minutes to several hours. After that, all bets are off as to the resulting calamity.
Needless to say, 12 miles will not protect residents from nuclear winds. Wind and weather are highly unpredictable. If the winds blow out to sea, what is the likelihood of dispersion of radiation? How does the radiation permeate into the eco-system? If winds blow back to the larger Japanese cities, the effect would be more immediate. Could wind patterns affect Hawaii or the west coast of the U.S.? We just don’t know.
The environmental, societal and economic impacts of a nuclear meltdown cannot be predicted. What we do know is that this entire series of events reminds us that our best engineering, planning and infrastructure cannot prepare us for all of the power which nature wields.
Originally posted by bekod
i found this map showing the fallout of the plume thedesimag.com... i fell it note worth to paste the related text in full note this text is from mach 12thnow that we know that there are 3 in melt down any one care to do the math???
apan has been hit with triple wave of devastation. First, the mega-quake at Sendai, then the cataclysmic tsunami, and now the potential for a meltdown of at least one, maybe two reactors. The death and destruction is testing a nation known for its resilience and resolve. Let us hope and pray that the nightmare of a nuclear meltdown does not materialize.
Three reactors at the Fukushima Daiichi nuclear complex are at risk of over heating and meltdown. The complex is 240 Km north of Tokyo. American Physicist Michio Kaku, whose parents were born in Japan, commented on the gravity of the situation on Saturday, March 12th. He described efforts to control the risk as “driving a car without brakes, which is out of control.” Explosions in the containment building forced the utility to expand the evacuation radius from 2 miles to 6 miles to 12 miles. If efforts to keep the nuclear rods cool fail, a full scale meltdown would be inevitable and would occur over a period of 30 minutes to several hours. After that, all bets are off as to the resulting calamity.
Needless to say, 12 miles will not protect residents from nuclear winds. Wind and weather are highly unpredictable. If the winds blow out to sea, what is the likelihood of dispersion of radiation? How does the radiation permeate into the eco-system? If winds blow back to the larger Japanese cities, the effect would be more immediate. Could wind patterns affect Hawaii or the west coast of the U.S.? We just don’t know.
The environmental, societal and economic impacts of a nuclear meltdown cannot be predicted. What we do know is that this entire series of events reminds us that our best engineering, planning and infrastructure cannot prepare us for all of the power which nature wields.
Originally posted by Bob Sholtz
to pred:
fair enough. i didn't take into account the weight of the particles. still... if they don't seal them off soon, they risk a much worse scenario. thats all i'm trying to say.
look at some of the chernobyl radiation spread maps. it wouldn't take much for this to turn into a devastating situation.
Originally posted by bekod
reply to post by predator0187
well how was i to know it is fake???? just because you say it is fake does that make it fake??? seemed real to me. for that could be the wind current for the 12th of march, not that it is that way now. and this is a place for debate. just tiered of the so called experts that change there mind, say one thing then tell something else and the MSM that falls for it
Originally posted by all2human
why cant they dig a very big and deep hole,with appropriate vents and filters,close to these reactors,line it with lead and bury the stuff forever and seal it over?would it still pollute the Pacific?i mean there doesn't seam to be a real solution yet,there just throwing lives at it,i know conditions are less than perfect but whats the plan here?and wheres the international community to the rescue like Haiti,etc?edit on 24-5-2011 by all2human because: (no reason given)
note there is no data so how do we know how much rad is pouring out?? and then this from Bloomberg www.bloomberg.com... from the link, note not one word as to how bad in % rate
Disaster Prevention and Nuclear Safety Network for NuclearEnvironments
Nuclear Safety Division Ministry of Education Cluture Sports Science and Technology
Disaster Prevention Network for Nuclear Environment
-Ministry of Education Culture Sports Science and Technology (MEXT) -
full text
Tepco Says Fuel Rods Melted Down in Two More Reactors at Fukushima Plant
By Takeshi Awaji and Yuji Okada - May 24, 2011 2:58 AM MT
slowly the full extent of this is coming to light with 1570+ news articles on this it is hard to chose the right one to post
Tokyo Electric Power Co. said fuel rods melted in two more reactors at its Fukushima nuclear plant, indicating for the first time that damage from the March 11 earthquake and tsunami is matching worse-case-scenarios.
Fuel rods in reactors 2 and 3 had almost complete meltdowns, spokesman Junichi Matsumoto told reporters in Tokyo today. That’s in line with U.S. assessments in the early days of the crisis that suggested damage to the station was more severe than Tokyo Electric officials estimated.
The meltdown of the cores is the “greatest at the No. 1 reactor, followed by the No. 3 unit and then No. 2,” Matsumoto said. The analysis of the damage became possible “after data from the central control room was retrieved.”
Japan’s biggest utility, known as Tepco, raised the possibility of more extensive destruction when it announced last week -- more than two months after the disaster -- that fuel rods in the No. 1 reactor had melted within 16 hours of the quake and cooling water was below the base of the rods.
“When Tepco announced there wasn’t any water in the No. 1 reactor pressure vessel, the speculation was that had also happened in No. 2 and No. 3 reactors,” said Ken Nakajima, a professor of nuclear engineering at Kyoto University who specializes in reactor safety. “Now, they have confirmed what everyone expected.”
Tepco has been struggling to cool reactors and spent fuel pools to stop radiation leaks and resolve the world’s worst nuclear crisis since Chernobyl in 1986. On April 17 it set out a so-called road map to end the crisis in six to nine months.
Cold Shutdown
The utility said it expects to achieve a sustained drop in radiation levels at the plant within three months, followed by a cold shutdown, where core reactor temperatures fall below 100 degrees Celsius.
It reiterated the timetable last week in an update of the plan, drawing criticism from Tetsuo Ito, head of the Atomic Energy Research Institute at Kinki University in western Japan.
Setting a timetable without knowing the condition of the reactor cores doesn’t make sense, Ito said in a phone interview from Osaka.
Today, Tepco’s Matsumoto said fuel rods in the No. 3 unit started melting on March 13 and those in the No. 2 reactor on March 14, The fuel dropped to the bottom of the pressure vessel after melting although the damage to the vessel is “limited,” he said, without giving details.
Fuel Rods
Tepco shares closed little changed today at 333 yen in Tokyo. The stock has slumped about 85 percent since the quake and tsunami struck.
The fuel rods in the No. 1 reactor started melting about four and a half hours after the magnitude-9 earthquake when the water level in the reactor core vessel fell below the base of the assembly, Tepco said last week.
Engineers established the extent of the damage after fixing gauges in the reactor No. 1 building. The building was damaged by a hydrogen explosion on March 12. Workers were sent into the No. 2 and 3 buildings last week to establish whether repairs could be carried out on gauges.
Originally posted by bekod
reply to post by predator0187
yes that is the big worry how much rad is going into the sea and in the air japan will be the hardest hit but with wind and ocean currents a little over time adds up to a lot, yes it is depleted over time, but do they not have different type of fuel rods?????
Originally posted by unityemissions
reply to post by bekod
The burden of proof is on the one making the claim.
I don't generally respond to people who bastardize the English language as much as you have.