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Tokyo Electric Power Co. said Sunday it will review its criteria for determining a self-sustaining nuclear chain reaction, known as criticality, in the wake of recent confusion over a case of "spontaneous" fission, which occurs at a constant rate.
The operator of the crisis-hit Fukushima Daiichi nuclear power plant only reported the criteria last month to the government's Nuclear and Industrial Safety Agency but did not include cases of spontaneous fission, when a rare gas like xenon is detected at a reactor, as in the incident on Tuesday.
When it revealed Wednesday that it had detected radioactive xenon at the crippled plant's No. 2 reactor, the firm known as TEPCO said that melted fuel inside the reactor may have temporarily gone critical, but denied the possibility the next day, saying it was the result of spontaneous fission.
The criteria were included in TEPCO's medium-term safety measures for the Fukushima Daiichi plant reported to the government on Oct. 17, amid the ongoing nuclear crisis at the plant triggered by the March 11 earthquake and tsunami.
Copyright 2011 Kyodo News
At around 11:00 am on November 6, since partner companies' workers who went on patrol found that the boiler of evaporative concentration apparatus stopped, we stopped operation of the apparatus 3B and 3C. Since the operation panel on the site alerted "Very low water level in boiler supply water tank", we assumed that the boiler stopped due to this reason. After that, we conducted investigation of the cause of decrease of supply tank water level. When we started a backup pump for transfer of boiler supply water, the alert stopped. Therefore we judged that one pump was troubled. In addition, although all the evaporative concentration apparatus stopped, water treatment by the water desalinations (RO membrane system) and water injection to the reactors have been continued.
For a man who has spent almost every waking hour over the past half year shepherding Japan through one of the world’s worst nuclear disasters, Goshi Hosono wears his worries lightly.
The youthful and telegenic government pointman on the Fukushima clean-up has been in his post since shortly after the earthquake and tsunami of March 11.
He has outlived one prime minister and counts as a survivor in the revolving door world of Japanese politics, a place peopled largely by faceless men in grey suits who are all but unknown in the world outside the debating chamber.
Despite a series of setbacks at Fukushima, including the revelation this week that spontaneous fission had been detected inside a reactor that was supposed to be all but extinct, Hosono is upbeat.
“We have come a long way in our efforts to control the accident,” he told AFP in an interview.
“It was the emergency workers at the plant who have contributed to it the most. We are finally seeing the goal of cold shutdown in sight. The workers’ efforts must be highly applauded.”
Originally posted by YarlanZey
Was reading a thread about an outbreak of illnesses in US. Has this got anything to do with fuku fallout or is it just one of those time of year things?
At least 6 schools experienced sudden mass outbreak of unkown illness in the last week
Some of the symptoms look similar to radiation exposure including headaches, vomiting and nausea. There are several theories, many blaming carbon monoxide, even though some of these took place outside hitting a large number of people at the same time including a firefighter, and tests were conducted but I dont think anyone took measured for radiation.
Originally posted by Aircooled
And the link. [French]
Originally posted by Unity_99
Report: US topsoil contains levels of radioactive cesium up to 10,000 percent higher than previously believed
Related to the above.
It won't be just Japanese children who are having radioactive particles in their urine. My kids have missed half their school now since last spring. And I'm really concerned about what is occurring to all the children, in Japan and the west coast of North America.
1. Traces of Japan nuclear fallout in California rainwater
2. Confirmed: EPA Rigged RADNET Japan Nuclear Radiation Monitoring Equipment To Report Lower Levels Of Fukushima Fallout
3. Tokyo to become dumping ground for radioactive rubble from Fukushima disaster
4. Fukushima: biggest single outflow of man-made radionuclides to the marine environment ever observed
5. Fukushima residents’ urine now radioactive
6. Fukushima: Strontium levels up to 240 times over legal limit near plant, uninhabitable land area now the size of 17 Manhattans
7. Radioactivity in Food: “There is No Safe Level of Radionuclide Exposure, Whether From Food, Water or Other Sources. Period.”
Fukushima, Nov. 6 (Jiji Press)--Tokyo Electric Power Co. started removing radioactive material from the spent nuclear fuel pool at the No. 2 reactor building of its crippled Fukushima No. 1 nuclear power plant on Sunday.
The step is necessary to begin work to purify salty water at the pool to prevent corrosion in the facility, TEPCO officials said.
The water, estimated to total 1,500 tons, has become salty due to the seawater injection to cool the spent fuel after the ongoing nuclear crisis occurred in the wake of the March 11 earthquake and tsunami, they said.
The operator of the nuclear power plant in northeastern Japan aims to reduce the radioactive substance to one-hundredth to one-thousandth of the current level of about 200,000 becquerels per cubic centimeter in a month, they said.
For the cesium removal work, TEPCO will use the existing cooling water circulation system for the pool.
After completing the work at the No. 2 reactor building, TEPCO will decontaminate water at the No. 3 reactor building's spent fuel pool, the officials said.
Copyright Jiji Press LTD.
Originally posted by Wertwog
Originally posted by Aircooled
Always Brilliant. Potrblog. I've seen the northern lights many times in the years I worked in the far north. I've never seen red or even orange.
This is highly alarming. Not since #3 blew have I had the willies like this. The correlation can't be ignored. I haven't really seriously thought that we could potentially loose the atmosphere via this disaster since I thought we are talking mostly about the troposphere. If this is true and we are seeing beta this high up in the magnetosphere, well this is extremely bad news.
American philanthropist David Rockefeller Jr. and his wife on Monday visited a coastal area in the city of Sendai, which was devastated by the March 11 earthquake and tsunami, and offered condolences to those affected by the disaster.
Rockefeller, board chair of the Rockefeller Foundation, and his wife Susan toured the Arahama district as Sendai Mayor Emiko Okuyama described the magnitude of damage at a local elementary school and works to remove debris.
The couple, who came to Japan to pledge continued support for the country and promote tourism, told the mayor they had never seen such devastation and expressed hope that people in affected areas would be able to rebuild their lives.
The two are also scheduled to visit an area ravaged by the calamity in the city of Higashimatsushima and a fishing port in Ishinomaki, both near Sendai in Miyagi Prefecture.
Rockefeller -- a member of the American industrial, banking and political dynasty whose name is synonymous with wealth and power -- has been involved in various nonprofit activities, while his wife is a producer of documentary films on conservation efforts.
Copyright 2011 Kyodo News
Originally posted by Northwarden
Grrr... nuclear advocates on page three ticking me off
reply to Q
Considering that the worlds experts dont have a clue whats happening on the ground, and we are in uncharted territories, anything is possible. I kinda agree with WW though that the Finnish guy wasnt very clear. He had data but not a great understanding of how to put it together.
reply to GR
NHK: Fears that walls of Fukushima spent fuel pools will erode — Tepco working to keep salt from causing holes (VIDEO)
Nov. 7 — The operator of the Fukushima Daiichi nuclear power plant has begun removing radioactive cesium from water in the No. 2 spent fuel pool, according to NHK.
“There are fears that the metal pipes and walls of the spent fuel pools will erode, as seawater was used after the accident to cool down the spent fuel pools.”
Tepco said removal of cesium from the spent fuel pool water is necessary to remove the salt. “Erosion caused by salt may cause holes to form,” reports NHK.
The case of the high-radiation supermarket in Setagaya-ku, Tokyo:
The contractor hired by the government dug up the location in the parking lot with 110 microsieverts/hour radiation, and found a glass bottle 40 centimeter below the surface. The radiation on that spot was the Fuku-I Nuke Plant level radiation of 40 millisieverts/hour. After removing the glass bottle, the radiation dramatically dropped to 25 microsieverts/hour (which is still very high, actually). The bottle allegedly contained radium-226, again. There are 15 locations in the supermarket compound (including inside the store) that are emitting high radiation, and it will take several weeks at least to dig up those locations to see what's buried. (From various sources: Nikkan Sports 11/2/2011, FNN News 11/3/2011, Nikkei Shinbun 11/2/2011, etc.)
They also dug up the location with 65 microsieverts/hour radiation and found a piece of glass with a small amount of radium from 20 centimeter below the surface. Once the glass was removed, the radiation dropped to 4 microsieverts/hour. (Mainichi Shinbun Japanese, 11/6/2011)