The Unit 2 reactor building is mostly intact and as a result the warm water in the spent fuel pool is causing high humidity inside, which is limiting the workers stay time. TEPCO will be installing a heat exchanger to cool the Unit 2 spent fuel pool to improve working conditions prior to working on the reactor cooling system.
Work is beginning on to reinforce the Unit 4 spent fuel pool. 30 steel supports will be installed below the spent fuel pool.
The MegaFloat structure pictured in the April 20 update below is now moored at the site. It will be used to store low level waste water.
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