Risk of hydrogen explosion from leaking containers at Fukushima plant… at least 10 percent have leaks, which could trigger a hydrogen explosion. [TEPCO] reported its findings at a meeting with a study group from the Nuclear Regulation Authority on May 22… there were about 1,300 such containers at the plant… The first leak was discovered in a lid on April 2… Of the 278 it had examined by May 20, it found 26 had some sort of leak or were bleeding from their lids… likely caused by hydrogen and other types of gases that resulted from the water’s exposure to high levels of radiation. Such gases appear to have accumulated in sediment at the bottom of the containers, expanding the volume of the liquid. An NRA official said the accumulating hydrogen poses a potential danger…

Unnamed Gov’t Official: "If the concentration level is high, a spark caused by static electricity could cause a container to explode.”