HYDRNOL is stored in two flexible bladders, so that the Spent and the Unspent fuel always occupy exactly the volume. Both bladders are contained in a steel tank. This arrangement is actually less prone to leaks in an accident than the gasoline and diesel tanks in today’s vehicles. Should there be a spill, the two HYDRNOL liquids are no more dangerous than gasoline or diesel, so the same procedures for spill clean-up would apply.