Tokyo Fire department (which has taken the task of pumping sea water into the reactor buildings) just held a press conference detailing the work that they have completed over the past two days.
Due to the wreckage caused by the tsunami, it is impossible to bring in heavy equipment near the water. The fire department sent in a truck that is heavily shielded against radiation to inspect the area, and laid out a 800 meter path leading from an area north east of reactor 1 at the water edge, leading counter-clockwise to an area on the west side between reactors 2 and 3.
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The department is using a series of truck-based pumps and several lengths of hoses (and hose extensions) to complete the 800m length. The work was completed by two teams of 20 men, using mechanical equipment as much as possible. There was one length just north of reactor 1 which is obstructed with wreckage; the hose connection along this length had to be completed by hand, and was done by 7 of the men.
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The work was completed, and water has been and is continuing to be pumped into storage pool 3. The pumps are nominally rated to be able to pump 3800 liters of water per minute, but because of the length, the department estimates a pumping capacity of about 3000L/m. Radiation levels above ground (near the top of reactor 3) were measured at approximately 40mSv, so the fire department deployed a fire truck equipped with mechanical arm to pump water from 22m above ground level, towards the direction of the location of the storage pool.
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The pumps and trucks are all capable of running without human monitoring, so as soon as the connection was completed and water being pumped into the building, all the crew were evacuated. The crew reportedly had little or no radiation exposure. Pumping is set to continue until March 20, 00:30.
Edit: Though the fire department could not visually confirm that the water was reaching the pools, they have now confirmed that since beginning the pumping, radiation levels near reactor 3 have fallen significantly. They estimate that 7 hours of pumping will provide approximately 1200 tons of water.
The fire department had reported to the site since March 12; work on the connection began on March 16. Reports and press conferences about the plan were delayed in order to focus on the work, possibly explaining why accurate news was relatively scarce.
Meanwhile, technicians and engineers have successfully restored electricity to reactors 5 and 6, and have officially confirmed that the temperature of the water in storage pool 5 has dropped significantly (from 68.8°C at 0500, to 48.1°C at 1800, March 19) and will continue to cool down. They are working to restore electricity to the remaining reactors.
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