Miniscule, yet extremely dangerous and incredibly difficult & expensive to deal with.
The estimated cost of making the UK's current stock of waste safe is currently £136bn, for a value of "safe" that leaves at least one of the high level waste pools being at an "intolerable" level of risk of leaking into groundwater until the late 2050s.
For comparison, the estimated cost of achieving net zero in the UK by 2050 is £110bn.
It’s only irrelevant to you as long as it doesn’t leak into your ground water supply after a few decades down the line, when we discover the containment didn’t resist corrosion as well as we thought. The danger of nuclear waste does not correspond to the amount at all.
The estimated cost of making the UK's current stock of waste safe is currently £136bn, for a value of "safe" that leaves at least one of the high level waste pools being at an "intolerable" level of risk of leaking into groundwater until the late 2050s.
For comparison, the estimated cost of achieving net zero in the UK by 2050 is £110bn.