 Hydrogen is highly flammable, and in the case of a fire it is possible that the hydrogen stored on-site could be burned up and escape.In this case, the tritium contents of the hydrogen would be released into the atmosphere, posing a radiation risk.Calculations suggest that at about , the total amount of tritium and other radioactive gases in a typical power station would be so small that they would have diluted to legally acceptable limits by the time they blew as far as the station's perimeter fence.