The operator of the troubled Fukushima Daiichi nuclear plant says a hose has been leaking seawater used to cool the No.5 reactor, which is currently in a state of cold shutdown.

Tokyo Electric Power Company, or TEPCO, is set to replace the hose, but will have to suspend the reactor's cooling function to do so. It says this will raise the water temperature, but the reactor will still remain in a state of cold shutdown.