The EU Commission reports that in Germany 583 kilograms of waste is produced per person annually. So it takes only ~17,000 Germans to produce 10,000 tonnes of normal waste per year.
Waste from decommission is not even included there.
http://papers.nber.org/tmp/26395-w26598.pdf
This paper examines the impact of the shutdown of roughly half of the nuclear production capacity in Germany after the Fukushima accident in 2011. We use hourly data on power plant operations and a novel machine learning framework to estimate how plants would have operated differently if the phase-out had not occurred. We find that the lost nuclear electricity production due to the phase-out was replaced primarily by coal- fired production and net electricity imports. The social cost of this shift from nuclear to coal is approximately 12 billion dollars per year. Over 70% of this cost comes from the increased mortality risk associated with exposure to the local air pollution emitted when burning fossil fuels. Even the largest estimates of the reduction in the costs associated with nuclear accident risk and waste disposal due to the phase-out are far smaller than 12 billion dollars.
The is a huge coal lobby and coal in underdeveloped regions being the only employer are right now the main reasons why coal is being kept alive while support for renewables is being kept low.
Not a single coal reactor or mine would have been shut down if nuclear would have still be there.
There's very little of it? Really?
Even the Spiegel article says:
"the amount of highly radioactive waste that Germany will have to store indefinitely - a total of around 10,000 tons - would fit inside a largish furniture store"
10,000 tons doesn't sound like very little to me. And that's just Germany.
I don't know the numbers, but I would be shocked if other countries like the US and Russia didn't have way, way, way more.