TEPCO mentioned, buried in a daily report, that they have been doing work on the unit 1-2 exhaust stack. This is the venting tower that has deadly high radiation at the base and was found to have structural damage in 2013. No further details were mentioned about the work or how it was done.
Machine translation of the statement from TEPCO
From the fact that the 24th March, the work of protective measures, such as for falling objects of Units 1 and 2 exhaust stack is finished, 15:37 the same day, start the Unit 1 spent fuel pool alternative cooling system, restart the cooling. Unit 1 spent fuel pool water temperature rose to 19.3 ℃ from 12.0 ℃ of cooling stopped, but there is room for 60 ℃ limit operational, there is no problem in management of the spent fuel pool water temperature.
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