In that case, 200 cubic meters amount to around 80 tonnes of CO2 emissions. That's around 80 MWh worth of coal electricity, which a 2 MW wind turbine running at a 30% CF offsets in around a week. So a complete non-issue.
I don't think the numbers for cement use by nuclear include the cement used for the sarcophagus at the end of the lifetime. But they should, if you want to talk about validity.
