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Originally posted by manicminxx
Edit: so, in a nutshell, that map is about airborne concentrations of iodine. Z's assumptions are correct.
Originally posted by DancedWithWolves
reply to post by zworld
Greetings all. Z, if memory serves, that would be the report that was withheld from the public early in the disaster and only admitted to much later. I am on my kindle so not able to search, copy and paste from way back like normally.
Come on bluetooth keyboard for kindle fire, come out of r & d.
And as for the dust, are they still burning the sludge created in water treatment nearby? That sludge was extremely hot.
Originally posted by Purplechive
To all the folks that contribute and lurk this thread...
- Purple Chive
Myself, Im kinda going with the theory that none of the original instrumentation survived the meltdown. The more I go over data the more Im beginning to think they're all fried. How could they not be. 2800C melts everything pretty much. Of course that doesnt explain where the readings they are getting are coming from.
Originally posted by intrptr
Since I began tracking and reporting the temperatures in the bottom of #2, I have been unable to find the new data in the same link I previously book marked. What is there is not updated and some windows in the site have vanished.
I would hate for that to mean that someone is monitoring this site for any "truth" and quickly covering the tracks.
Oh, and keep an eye on #2 CRD Temp. it ain't done yet.
Originally posted by Aircooled
Some info from our bud Lucas.
New docs show contamination was much higher than reported,
Monju fast breeder reactor's sodium detector hits trouble
TOKYO (Kyodo) -- A sodium detector at Japan's prototype fast-breeder reactor Monju went out of order, the government's Nuclear and Industrial Safety Agency said Thursday.
But neither sodium leakage nor damage to the environment has been reported, said the agency under the Ministry of Economy, Trade and Industry.
The state-run Japan Atomic Energy Agency, the operator of the Monju reactor in Tsuruga, Fukui Prefecture, is currently working to repair the detector, it said.
An alarm sounded at the central control room shortly after 3 p.m. Thursday notifying of trouble at the detector. A fan that sends air around the sodium coolant piping to the detector apparently came to a halt, it said.
Originally posted by intrptr
There are charts somewhere that I was monitoring that answer your question z about new "temporary" Reactor Temp Sensors.
POLITICIANS' FAILURE The Fukushima crisis destroyed the myth that atomic energy is safe, cheap and clean and prompted Japan to scrap a plan to boost its share of electricity demand to more than half by 2030. The government is now crafting a new mid-term programme.
But critics have questioned whether Noda, a stolid former finance minister keen on fiscal reform, is really committed to reducing reliance on atomic energy and introducing reforms that would help give renewable energy a bigger share. "It is not true that things have not moved forward (under Noda) ... There have been dramatic changes," Kan said. "The Noda administration is proceeding basically with what I was thinking at that time (of the accident) although there are various forms of resistance such as from some businesses. Noda and the nuclear minister are steadily proceeding with reform."
He did, however, take a swipe at politicians on both sides of the aisle for bickering rather than cooperating in the wake of the accident. "The Japanese people have acted calmly and were patient in their response to the accident," he said. "But as for whether politicians fully cooperated at the time of the accident and thereafter, unfortunately that's not the case."
Kan stopped short of floating a target date for when Japan should exit nuclear power entirely, although he noted that reality on the ground was moving ahead of policy. All but three of Japan's 54 reactors are off-line mostly for maintenance, and the government has yet to persuade wary local authorities that it is safe to resume operations. "I believe that most people will seek a society that does not rely on nuclear power if we can show them specifically that (non-nuclear) energy can realistically be supplied," Kan said.
"Japan can strengthen its energy supply system outside of nuclear and fossil fuel while moving forward with energy conservation ... It is possible for Japan to become the model of a society that does not rely on nuclear power."
Two weeks after the crisis in March, the head of Japan's Atomic Energy Commission drew up a worst-case scenario. It was presented to Kan, but never officially released to the public.
Below are key points from the scenario document, obtained by Reuters, that was compiled by commission chairman Shunsuke Kondo and entitled "Sketches of Scenarios of Contingencies at Fukushima Daiichi Nuclear Power plant."
MULTIPLE REACTOR EXPLOSIONS, MELTDOWNS AT FUEL POOL Multiple vapor and hydrogen explosions and a loss of cooling functions at the six reactors at Tokyo Electric Power Co's Fukushima Daiichi nuclear plant lead to radiation leaks and reactor failures.
Thousands of spent fuel rods, crammed into cooling pools at the plant, melt and mix with concrete, then fall to the lower level of the buildings.
CHAIN OF EVENTS In a possible domino effect, a hydrogen explosion at one reactor forces workers to evacuate due to high levels of radiation, halting cooling operations at all reactors and spent fuel pools. Reactors and cooling pools suffer serious damage and radiation leaks.
At 2:00 pm today, as result of conducting the thermometers concerned, we judged that it does not deviate with the "Conditions for operation" which are provided in the Reactor Facility Safety Regulation for the temperature of the lower part of the Reactor Pressure Vessel of Unit 2, we corrected an original judgment retroactively to on February 12.
And we decided to exclude the thermometers from the monitoring items for the temperature of the lower part of the Reactor Pressure Vessel in Safety Regulation Article 138 and we checked the temperature of the lower part of the Reactor Pressure Vessel than other thermometers and we continuously confirm that there is not critical state inside the Reactor.
We decrease the water injection amount into Unit 2 as soon as we are ready.
We try the maintenance of the cold shutdown state and the ensuring safety of the plant continuously
Using seawater to cool nuclear fuel was the best choice for post-tsunami Japan,
but the method could be risky. ---
But Navrotsky and others have since discovered a new way in which seawater can corrode nuclear fuel, forming uranium compounds that could potentially travel long distances, either in solution or as very small particles. The research team published its work in the journal Proceedings of the National Academy of Sciences.
“This is a phenomenon that has not been considered before,” says Navrotsky, distinguished professor of ceramic, earth, and environmental materials chemistry. “We don’t know how much this will increase the rate of corrosion, but it is something that will have to be considered in future.” -----
Uranium in nuclear fuel rods is in a chemical form that is “pretty insoluble” in water, Navrotsky said, unless the uranium is oxidized to uranium-VI—a process that can be facilitated when radiation converts water into peroxide, a powerful oxidizing agent.
The Fukushima-Daiichi nuclear accident brought together compromised irradiated fuel and large amounts of seawater in a high radiation field. Based on newly acquired thermochemical data for a series of uranyl peroxide compounds containing charge-balancing alkali cations, here we show that nanoscale cage clusters containing as many as 60 uranyl ions, bonded through peroxide and hydroxide bridges, are likely to form in solution or as precipitates under such conditions. These species will enhance the corrosion of the damaged fuel and, being thermodynamically stable and kinetically persistent in the absence of peroxide, they can potentially transport uranium over long distances.
Displaying results 1-10 of 442
1-10 of 372,464 hits for fukushima @ Scirus
・ 14:00 February 17: We evaluated that the temperature at the bottom of the PCV was not actually risen and it didn’t exceed the limit of the safety operation. Our evaluation of violation of the safety operation was corrected retroactive to February 12. The meter was deleted from the list of the meters to monitor the temperature of the bottom of the PVC. The temperature is monitored with the other meters. *1) Based on the management of facilities stipulated at the Article 12 “Mid-term safety securing” of Act of the Regulation of Nuclear Source Material, Nuclear Fuel Material and Reactors, it provides “Operational Limit“ and “measures required in the case that does not satisfy the Operational Limit“, it is required to respond based on the measures required in the case that does not satisfy the Operational Limit. In our case, in order to implement the preservation work, it was shifted to outside of operational limit condition as planned (from 1:55 pm on February 12), we changed the water injection amount into the reactor of Unit 2. At 2:20 pm, we judged that it was not satisfied “the temperature is below 80 °C at the bottom of PCV”, which is stipulated in “the Reactor Facility safety Regulation” as one of the “Conditions of operation”. as the indicated temperature was 82 °C beyond 80 °C. We continue to change the water injection amount accordingly. *2) Reactor Facility Safety Regulation provides necessary conditions such as the numbers of the permitted machines etc. or criteria of temperatures and pressures for securing multiple safety function for operating reactors and for keeping nuclear power stations stable and these are treated as conditions for operation. When there happen some malfunctions of equipment provided in the regulation and a nuclear power station can not clear the conditions temporarily, operators have to take required countermeasures.