Now that the accident is officially "over", Fukushima I Nuclear Power Plant takes on an atmosphere of a deserted, abandoned place where occasional maintenance is done with all-mighty duct tape. (Nothing against duct tape.)
A TEPCO worker found a leak from a Kanaflex hose near the Reverse Osmosis facility (part of desalination process) during a routine inspection round. The water was not radioactive, as it was the filtered water from the nearby river that TEPCO has been using to mix with the treated water before the water is injected back into the reactors for cooling. The leak was plugged by a tape, but the leak hasn't completely stopped (one drip per 2 minutes, according to TEPCO's handout for the press, 12/29/2011). TEPCO plans to replace the hose. (I hope so.)
From TEPCO's press release on December 29, 2011:
It looks like a puncture. By the way, there are apparently a number of similar punctures throughout the length of the hoses that make up the water injection system. Some of them due to quality problem, but many of them are caused by a weed (Imperata cylindrica L.). The weed pierced through the Kanaflex pipes all over the plant as it grew during the summer; now it is winter and the plants shrivel and die off, unplugging the holes they had made and causing small leaks all over the place. One tough weed.
I suppose this is not what NISA and TEPCO had expected. Totally "so-tei-gai" (想定外）.