Slutsatsen är att inneslutningen höll.
liten update från november för den seriöst intresserade:
http://www.iaea.org/newscenter/focus/fukushima/statusreport241111.pdf• Desalination equipment for the Spent Fuel Pool at Unit 2 is currently being prepared and planning for desalination of the Spent Fuel Pool at Unit 3 is underway;
• Approximately
161,580 tons of accumulated water has been treated onsite as of 4 November;
• On 28 October installation work for the (tsunami) water shield wall began. Land surveys and boring for construction activities are on-going;
• The
building cover for the Unit 1 Reactor Building was completed on 29 October;
• Approximately
28000 m3 of debris has been cleaned up onsite. 6000 m3
of that debris is stored in waste containers onsite;
• Debris removal from the upper part of Unit 3 and Unit 4 is still on-going;
• The primary containment vessel (PCV) gas control system at Unit 2 began operation on 28 October;
• Installation work for PCV gas control system for Units 1 and 3 is on-going;
• Xenon was detected within the PCV gas control system at Unit 2. The measured xenon was in very low concentrations and based on TEPCOs calculations it was concluded that the measurement corresponded with xenon production via spontaneous fission of Cm-242 and Cm-244 and not a criticality event;
• The
dose to someone at the site boundary is currently estimated to be
0.1 mSv/yr. The estimate is based on the current rate of material being released from Units 1-3, i.e., excluding all previously released material;
• On 8 November
a model decontamination project has begun in the restricted area;
• TEPCO has been providing personnel to support the government’s decontamination efforts in municipal environments as of 8 November;
• As of 1 November 20 onsite rest stations have been established covering 4750 m2 and capable of supporting 1600 people;
• As of 8 November workers have been allowed to work without a full facemask and instead with a partial facemask in select locations;
TEPCO’s Fukushima Daiichi nuclear power plant station reactors 1, 2 and 3 require circulating water to remove heat from their fuel.
Plant operators are working to bring the reactors into a “
cold shutdown condition” defined by TEPCO and the Nuclear Emergency Response Headquarters as:
1) Lowering the coolant water temperature to below 100 degrees centigrade while reducing the pressure inside the reactor vessels to the same as the outside air pressure, or 1 atmosphere (atm); and
2) Bringing release of radioactive materials from primary containment vessel under control and reducing public radiation exposure by additional release (not to exceed 1 mSv/year at the site boundary as a target).
...
Latest protective measures for the public On 17 November METI released an updated version of the “Roadmap for Immediate Actions for the Assistance of Residents Affected by the Nuclear Incident”. The main updates added to the document include, though they are not limited to, the following points:
• As of 16 November the current numbers for the second round of temporary access has totalled 17337 households amounting to 40622 people being granted permission to travel to their homes by private car or by bus;
• As of 4 November 2094 households from Fukushima Prefecture have moved into their new homes (or been assigned new homes). Nationwide 16931 households have moved or been assigned new homes. Both figures include those displaced by the nuclear accident and those displaced by the earthquake and tsunami;
...
• On 29 October the Ministry of the Environment presented the “Basic Concept of the Interim Storage Facility Required for
Handling of Environmental Pollution by Radioactive Materials Associated with TEPCO‟s Fukushima Dai-ichi NPS Accident”. The general concept is that temporary storage sites will be established in each municipality or community. The location of the interim storage facility will be decided by end of fiscal 2012. The final disposal site will be located outside Fukushima Prefecture;
• As of 7 November in-depth monitoring of the sites to be decontaminated has started;
• On 11 November the basic policy pursuant to the Act on Special Measures Concerning Handling of Radioactive Pollution was decided by the Cabinet as a policy for determining basic direction for addressing environmental contamination by the released radioactive materials resulting from the accident;
• On 8 November in-depth monitoring of Okuma Town began as part of the model decontamination project targeting locations in the restricted area;
• As part of the selection process for the decontamination technologies to be tested, 25 companies out of 305 applicants were selected on 9 November to participate in a validation test of their techniques and technologies. The testing process is being performed in a prompt manner;
• As of 31 October
more than 230000 people have been screened for contamination –
not a single case of adverse health effects has been found in the population;
• On 9 October the Fukushima Medical University Hospital began screening residents under
the age of 18 for thyroid cancer as part of a preliminary survey. As of 31 October 2485
residents have been screened at the hospital. A mobile thyroid examination process began
on 14 November;
• Fukushima Prefecture is now supporting a loan program for the distribution of personal
dosimeters to children and pregnant women (approximately 300000 people). The number of
dosimeters planned to be distributed within the 47 municipalities is approximately 230000."
What is the latest information regarding radiation monitoring of foodstuffs? Food monitoring data were reported from 16 to 19 November by the Ministry of Health, Labour and Welfare for a total of 3415 samples collected on 25, 27, 29-31 October and from 1-18 November in 34 different prefectures...
These comprised samples of various vegetables and vegetable products, fruit and fruit products, wild and refined tea leaves, mushrooms, nuts, cereals, dairy products, meat, eggs, fish and seafood. Analytical results for 3399 (over
99.5%) of the 3415 samples indicated that Cs-134 and Cs-137 or I-131 were either not detected or were below the regulation values set
by the Japanese authorities. However,
16 samples were above the regulation values for radioactive caesium (Cs-134 and Cs-137), as follows: ...
Länkar...
http://www.tepco.co.jp/en/news/110311/dagliga kommunikéer
http://www.tepco.co.jp/en/press/corp-com/release/index-e.htmlDet talas om utrymningszon
men i verkligheten är avståndet inte avgörande för mängden nedfall; det är vindriktning och nederbörd
En liten passus om hur nära det var att olyckan kunnat undvikas:
"In the late 1990s to comply with new regulatory requirements, three additional backup generators for reactors Nos. 2 and 4 were placed in new buildings located higher on the hillside. All six reactors were given access to these generators, however the switching stations that sent power from these backup generators to the reactors' cooling systems for Units 1 through 5 were still in the poorly protected turbine buildings. All three of the generators added in the late 1990s were operational after the tsunami.
If the switching stations had been moved to inside the reactor buildings or to other flood-proof locations, power would have been provided by these generators to the reactors' cooling systems."
http://en.wikipedia.org/wiki/Fukushima_Daiichi_nuclear_disasterFukushima har ställt till det för elförsörjningen i Japan. Problemen har förvärrats avsevärt av uppdelningen på mitten av landet i 50 resp. 60 Hz.
(får de ev. problemen med svensk eldistribution att se obetydliga ut!).
http://en.wikipedia.org/wiki/Electricity_distribution_in_Japan
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