Right, the liabilities are hard to determine and those liabilities may increase substantially if simply buried.
This is because most types of spent nuclear fuel slowly become "weapons-grade" as the short half-life isotopes decay.
This is because most types of spent nuclear fuel slowly become "weapons-grade" as the short half-life isotopes decay.
Since Pu-240 has a shorter half life than Pu-239, it is technically true that the isotopic composition in spent fuel becomes more weapon-like as the fuel ages. But it is very slow because Pu-240 still has a half life in excess of 6500 years. It would take more than 13000 years for the decay of Pu-241 to improve the isotopic profile of today's power reactor plutonium to something near "weapons grade."