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On 11/27/2014, coolant system of Reactor 2 pool suddenly stopped, according to Tepco.
Approx. 5 hours later, Tepco managed to reboot the system. Pool water temperature was 16.7 ℃ when it was stopped. Tepco reported it was 17.3 ℃ when the system was rebooted.
You are probably aware of the laws passed in Japan making publishing Fukushima news punishable by jail time? It seems to have drastically reduced independent information coming out about it - we have to rely on little leaks and Tepco's infamous reports and PR videos which are enough to turn ones stomach over a few times.
Even cement couldn’t shut up the underground trench, Tepco reported on 11/27/2014. There are underground trenches connected to each crippled reactor building. Each one of them retains extremely highly contaminated water and it is assumed that the water is leaking to the ground and the sea. For example, the underground trench of Reactor 2 retains 5,000 t of contaminated water, the one of Reactor 3 retains 6,000 t as Tepco reports. In order to pump up the contaminated water, it is necessary to separate those trenches from the buildings. After they admitted the frozen water wall failed, Tepco tried to fill the underground trench with cement and grout. They completed filling one of the joint parts between the trench and Reactor 2 T/B (Turbine Building) on 11/6/2014 and pumped up the retained water of the trench on 11/17/2014. By pumping up the water for 6 hours, they managed to reduce the retained water level by 20cm. However the water level went back to the previous level only 2.5 hours after turning off the pump. Also, the water temperature jumped up to suggest the water coming from Reactor 2 T/B is heated by something. The largest increase in temperature was approx. 35℃ within 4 days (-27℃ → 8℃). It became clear that even if they fill the trench with cement, contaminated water, which contains the direct leakage of coolant water, would keep flowing into. The filling cement would make it even more difficult to pump up the water. At this moment Tepco is not announcing they are going to change the plan.