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The future prediction of the discharge estimates that 111 TBq of 137Cs and 44 TBq of 134Cs are released into the Pacific Ocean during 2011–2111. This condition shows that prevention of the radioactive substance leakage from the FDNPP is insufficient since river as the media of radioactive substance transport is also significant source. While the discharge from Abukuma River is equal to 30% of FDNPP direct discharge and also considering the discharge of the radioactive substance from the other major rivers in Fukushima Prefecture (Arakawa, Naka, Agano, Tadami), the sum of the discharge from these rivers could be as large as the leakage from FDNPP. Although this statement needs confirmation, it is sufficient to warrant concern from the authorities of rivers as a major source of radiocesium flux into the Pacific ocean.
Mean values of the water-column inventories decay-corrected for the Fukushima-derived 134Cs and the bomb-derived 137Cs were estimated to be 1020 ± 80 and 820 ± 120 Bq m−2, respectively, suggesting that in winter 2012 the impact of the FNPP1 accident in the western North Pacific Ocean was nearly the same as that of nuclear weapons testing.
Japan's government approved Friday a revised 40-year roadmap to clean up the wrecked Fukushima nuclear plant, but many questions remain.
The plan, endorsed by key Cabinet members and officials, delays the start of a key initial step — the removal of spent fuel in storage pools at each of the three melted reactors — by up to three years due to earlier mishaps and safety problems at the plant.
Three of the plant's six reactors melted following the 2011 earthquake and tsunami. The fourth, which was offline and had no fuel in the core at the time of the accident, suffered damage to its building, and its fuel storage pool was emptied late last year.
Despite the delay, experts need to locate and study melted fuel inside the reactors and develop robots to start debris removal within six years as planned.
Experts believe melted fuel had breached the reactor cores and mostly fell to the bottom of the containment chambers, some possibly sinking into the concrete foundation.
The plant operator, Tokyo Electric Power Co., has conducted limited surveys of the reactors using remote-controlled robots.
The roadmap says the initial plan to repair damage in the containment chambers and fill them with water to conduct debris removal underwater is more technically challenging than previously thought, and alternative plans need to be studied.
Radiation levels at the reactors remain high and the plant is still hobbled by the massive amount of contaminated water.
Fuel removal delayed by up to 3 more years
Nuclear & Energy Jun. 12, 2015 - Updated 02:59 UTC-4
A new roadmap says the removal of fuel rods from the spent fuel pools of the crippled reactors at the Fukushima Daiichi plant will begin 2 to 3 years later than originally planned.
Officials from the Japanese government and Tokyo Electric Power Company officially endorsed the revised plan at a meeting on Friday.
The decommissioning schedule for the reactors disabled in the 2011 earthquake and tsunami was reviewed for the first time in 2 years.
The roadmap refers to 2 major tasks -- removal of the fuel rods left inside spent fuel pools in the reactor buildings and cleaning up the melted nuclear fuel in the reactors.
The revised plan says the removal of fuel rods from the pools may be postponed until 2017 at the No.3 reactor building -- a delay of 2 years. It says the work at the No.1 and No.2 reactor buildings will start in 2020 -- 3 years later than originally planned.
Officials cite the need for more time to remove radioactive debris from the buildings and decontaminate the facility.
The revised roadmap also calls for studying new ways of removing molten fuel from the reactors, in addition to the current procedures. The new methods will not utilize water to shield workers from the strong radiation.
The initial methods entailed filling the reactor containment vessels with water before removing the melted fuel.
But the officials found this to be more difficult than they originally thought due to the possibility of water leaks from the vessels as well as the need to ensure their earthquake resistance.
The new roadmap keeps the initial target of beginning the removal of melted nuclear fuel within 6 years, but the plan does not state which reactor will be chosen first.
Industry ministry officials say the start of the removal will depend on which method is selected, but they believe it can begin within 6 years.
@jadedandcynical i'm on the fence with the weapons comparison. my understanding is that fuku is a lot more dirtier than the former and seems to be a continuous criticality times 3. I suspect the corium is under the groundwater (and elsewhere) and offering continued energy to its' egress.
The Safecast radiation measurement dataset contains over 27 million measurements as of March 2015.
Since April 2011, Safecast volunteers have been collecting radiation data using bGeigie mobile radiation sensors. As of March 2015, over 600 bGeigies have been built and have collected over 27,000,000 measurements. Almost all Japanese roads have been measured, with many areas repeatedly measured over time to provide clear evidence of radiation level changes. Additionally, data has been collected from every continent around the world and more 65 countries including most of Europe and North America. The Safecast dataset also includes data from far corners including Sudan, Iraq, Antarctica and the Marshall Islands and sites of interest such as Chernobyl.
In March, 2015, realtime.safecast.orglaunched. This new initiative is focused on deploying stationary radiation sensors in Japan and globally. These sensors will be sending real-time updates about radiation levels and publishing this data without interceptions as CC-0 data.
The sensors in Japan will focus on areas around the Fukushima Daiichi plant, including the exclusion (“difficult to return”) zone. We’re working with volunteers who are in contact with evacuees who have expressed the desire to be able to check the radiation levels at their evacuated houses in realtime. For people living outside of the zone, we will work with volunteers to house the sensors. This will be strictly a “pull” model, where we’re dependent on volunteers who are willing to support the initiative.
originally posted by: Ektar
Is there anyone in the US on the East Coast posting anything?