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In a news conference on May 1, TEPCO said the amount of water being pumped into the reactor's pressure vessel had been brought back down from 10 to 6 tons per hour.
As a result pressure inside the containment vessel rose to 1.4 times normal atmospheric pressure -- about the same level as before the amount of water was increased. Officials said the water level inside the reactor's pressure vessel remained almost unchanged
-- at about 1.6 meters above the top of the fuel rods --
when the amount of water was temporarily increased.
With water pumped into the pressure vessel leaking out, workers estimate that the water level inside the containment vessel stands at about 6 meters, but they do not know the exact level. More than 7,400 tons of water -- roughly the amount needed to fill the containment vessel -- has already been pumped into the reactor. Normally, this would have significantly increased the water level inside the pressure vessel. "We don't know why the water level isn't increasing,"
a TEPCO representative said. "We've judged that 6 tons of water per hour is enough to cool the reactor down, so we want to continue to pump in water this way."
On May 1 TEPCO announced that it had pumped about 120 tons of water from the turbine building of the No. 6 reactor into a makeshift tank. The level of accumulated water, totaling roughly 4,900 tons, stands at about 2 meters.
...at Reactor No. 6, workers Tuesday pumped 100 tons of water from the basement of the turbine building into the reactor's condenser unit. NISA said underground streams are a possible source. Before the crisis, streams beneath reactors No. 5 and 6 were pumped to divert water, a process that hasn't been conducted since the quake.
The operator of the troubled Fukushima nuclear power plant says it has detected higher levels of radioactive materials in seawater samples from near the water intake at one of the reactors.
Tokyo Electric Power Company says it detected 130 becquerels of radioactive iodine-131 per cubic centimeter in samples collected near the water intake for the Number 2 reactor on Saturday. The figure is 3,300 times the national limit and 30 percent higher than the level detected on Friday.
It's the same site where iodine-131 at a level 7.5 million times the limit was detected on April 2nd. TEPCO says it detected radioactive cesium-134 at 120 times the limit and cesium-137 at 81 times the limit at the same place on Saturday. But the readings taken for these 2 substances were down for the third straight day.
There was a 90 percent drop in levels of iodine and cesium to the south of water intakes for reactors 1 through to 4.
The level of highly radioactive water in the sea rose to three to four times the level of the previous day along the coast 10 kilometers south of the power plant.
TEPCO says it's continuing to monitor the level, though there has not been a fresh leak of highly contaminated water.
Monday, May 02, 2011 05:45 +0900 (JST)
Relatively high levels of radioactive cesium have been detected in the sludge from a waste water treatment plant in Koriyama City, Fukushima Prefecture.
The prefectural government is tracking some of the sludge that has been shipped out of the prefecture to be used in making cement.
The prefecture's investigation found that the sludge contained 26,400 becquerels of radioactive cesium per kilogram.
The solidified slag made from it contained 334,000 becquerels per kilogram, which is 1,300 times the level before the accident at the Fukushima Daiichi nuclear power plant.
The prefecture says rain likely washed radioactive substances from the surface of the ground into the sewer, and they became concentrated through processing.
The sludge from the facility is transported out of the prefecture and used to produce cement.
The prefectural government will suspend the recycling and track the sludge that has been shipped since the accident to determine how it has been used.
The land and transport ministry says it will report the incident to the Nuclear Safety Agency, and coordinate with the Environment Ministry and other relevant organizations to find ways to process the sludge safely. The sludge must be kept at the facility until a solution is found.
The ministry says there is no precedent for this, but that it will decide soon what to do.
Sunday, May 01, 2011 23:20 +0900 (JST)
Workers have begun a plan to enter a building at the damaged Fukushima Daiichi nuclear plant to install equipment that will help to cool down the reactor.
Tokyo Electric Power Company, the operator of the plant, said on Monday that workers are preparing to install devices that will reduce the amount of radioactive materials inside the No.1 reactor building.
The equipment is designed to filter out 95 percent of the radioactive substances in the air coming through the ducts, when operated for 24 hours.
Four of the devices will be installed outside the reactor building door.
Workers will need a safe environment to install equipment to steadily cool the reactor. A water gauge will help TEPCO to determine the feasibility of its plan to cool the reactor's fuel rods by covering them with water.
Eight workers are set to enter the No.1 reactor building as early as Thursday. They will be the first to do so since a hydrogen explosion occurred one day after the March 11th earthquake and tsunami.
Monday, May 02, 2011 12:56 +0900 (JST)
URGENT: Radiation leaks from fuel rods suspected at Tsuruga plant: local gov't
FUKUI, Japan, May 2, Kyodo Leaks of radioactive materials from fuel rods have been suspected at a nuclear power plant in Tsuruga, the Fukui prefectural government said Monday, citing a rise in density of the toxic substances in coolant water.
* Company says might close reactor for technical reasons
* Says no radiation leak
* Reactor is not in area affected by March 11 quake, tsunami (Adds detail, background)
TOKYO, May 2 (Reuters) - Electricity wholesaler Japan Atomic Power Co said on Monday it would consider shutting a reactor at its Tsuruga nuclear plant due to a technical problem, adding that there had been no radiation leak from the facility.
The plant is around 450 km (280 miles) west of Tokyo in Fukui prefecture, an area that was not affected by a massive earthquake and subsequent tsunami that hit Japan on March 11. The company said it had identified a possible leak of iodine from the 1,160-megawatt No.2 reactor's nuclear fuel assemblies into its coolant.
Originally posted by Cyanhide
Got a problem ,i got lost in the stream of information in this thread, Could someone tell me in short how bad things are right now ? i lost track at page 600'ish.
Like on scale 1/10 how bad is the situation now on worldscale ?
The plant at Tsuruga needs 3500 kilowatts to safely cool its reactors, but the backups can only deliver 1020 kilowatts, says Kyodo - and that can't be fixed til next March. The agency's sources says the power available will "only run measuring gauges and small-scale water injection devices". And at the Tomari power station, a 3,200 kilowatt backup generator cannot "achieve stable shutdown" of the reactors - and that won't be fixed until some time in the next two years.
Kyodo's story is appalling news for Japan. Nuclear power stations can never be switched off since residual heat from low level fission must continually be transported away from the core. The lack of backup power means further accidents are waiting to happen.
Electricity wholesaler Japan Atomic Power Co said on Monday it would consider shutting a reactor at its Tsuruga nuclear plant due to a technical problem, adding that there had been no radiation leak from the facility.The company said it had identified a possible leak of iodine from the 1,160-megawatt No.2 reactor's nuclear fuel assemblies into its coolant.
Originally posted by Destinyone
reply to post by Chakotay
Thank You Chakotay. Your heads-up, put many questions to rest.
It is reported that 245 workers are working at the stricken nuclear plant and firefighters, police officers, and the military are also based in and around the site.
According to Tanigawa the workers do not have access to baths, fresh food, any privacy, and the long hours and work pressure is creating many negative side effects.
External pressure is also building up because many loved ones want the workers to return home. Also, some workers have lost family members and their homes and the siege like mentality must be building up.
Added to this is the fact that other workers do not want to replace them, therefore, it appears that everything depends on them and this is also leading to huge pressure.
One worker stated, in confidence, that “We are shocked by the high level of radiation….I work at the plant just because I want to save my hometown……We are the ones who have worked at the nuclear plant all this time. Who else would take the job now if we don’t?
In the coming weeks the natural temperature will increase and the hot and humid conditions will lead to further problems.
Golden Week may be a time for the majority of people to refresh themselves but for the workers at the stricken nuclear plant they will be battling away and doing their level best in order to salvage the stricken plant.
These brave souls need more support and living conditions need to improve and quickly because their share of the burden is too high.
Rumor has it that many of the cleanup workers are burakumin. This cannot be verified, but it would be congruent with the logic of the nuclear industry and the difficult job situation of day laborers. Because of ostracism, some burakumin are also involved with yakuza. Therefore, it would not be surprising that yakuza-burakumin recruit other burakumin to go to Fukushima. Yakuza are active in recruiting day laborers of the yoseba: Sanya in Tokyo, Kotobukicho in Yokohama, and Kamagasaki in Osaka. People who live in precarious conditions are then exposed to high levels of radiation, doing the most dirty and dangerous jobs in the nuclear plants, then are sent back to the yoseba. Those who fall ill will not even appear in the statistics.1
Fukushima workers before the catastrophe
According to data published by the Nuclear and Industrial Safety Industry (NISA), in 2009, there were 1108 regular employees (seisha’in 正社員) at Fukushima NP1. These were TEPCO employees, but may also include some employees from General Electric or Toshiba, Hitachi and Mitsubishi. But the vast majority of those working at Fukushima 1 were 9195 contract laborers (hiseisha’in 非正社員). These contract employees or temporary workers were provided by subcontracting companies: they range from rank and file workers who carry out the dirtiest and most dangerous tasks—the nuclear gypsies described in Horie Kunio’s 1979 book and Higuchi Kenji’s photographic reports—to highly qualified technicians who supervise maintenance operations. So even within this category, there is much discrepancy in working conditions, wages and welfare depending on position in the hierarchy of subcontracted tasks. What is clear is that the contract laborers are routinely exposed to the highest level of radiation: in 2009 according to NISA, of those who received a dose between 5 and 10 millisieverts (mSv), there were 671 contract laborers against 36 regular employees. Those who received between 10 and 15 mSv were comprised of 220 contract laborers and 2 regular workers, while 35 contract workers and no regular workers were exposed to a dose between 15 and 20 mSv.
Since contract laborers move from one nuclear plant to another, depending on the maintenance schedule of the various reactors, they lack access to their individual cumulative dose for one year or for many years. NISA compiles only the cumulative dose for each nuclear plant. The result is that the whole system is opaque, thus complicating the procedure for workers who need to apply for occupational hazards compensation.
Originally posted by Silverlok
I think that the RPV At #3 (whatever is left of it) is still in the building . If the sensors on it can be trusted it has well below (1/10) normal air pressure. And the dry-well is at about air pressure , but the torus is at 1.7 atmospheres .
The 'bottom' of the RPV temp has been steadily rising and is currently 118C. So if all that can be trusted then it's a good bet the rpv is still in the drywell (somewhere) and hasn't moved far enough to dislodge the wires that connect the sensors , so it is plausible that the thing in Mosphet's post is the upper ring that serves as the floor of the pool when they flood the top of the drywell to open the core and changes rods
Snip to save space
edit on 2-5-2011 by Silverlok because: salt is good
Water boils at 100 degrees Celsius, 212 degrees Fahrenheit or 373.15 Kelvin under standard conditions at sea level (at one atmosphere of pressure). Read more: wiki.answers.com...
Originally posted by Cyanhide
Like on scale 1/10 how bad is the situation now on worldscale ?
Originally posted by mrbillshow
Would it be more helpful to you if the information on this thread were organized chronologically and by subject?