According to NHK public broadcaster in Japan, Tokyo Electric Power Company has announced the installation of heat exchangers in the Unit 2 atomic reactor building intended to help cool the unit's distressed high-level radioactive waste storage pool. The Unit 1 and Unit 3 reactor buildings are to similarly get heat exchangers in June, and the Unit 4 reactor building in July, in a bid to prevent any further high-level radioactive waste fires, as occurred in the Unit 4 pool in the initial days of the Fukushima nuclear catastrophe.