This proposed structure they can't afford won't "conclude" Chernobyl.

The new structure will be the largest of its kind in the world - an arch more than 100m (328ft) high, 250m (820ft) wide and 160m (524ft) long.
It will be assembled away from the Chernobyl site and then slid into place over the damaged reactor, before the ends are blocked up.

BUT!!!...

It is expected to give Ukraine 100 years to dispose of the nuclear waste.

...it's another temporary fix and they'll need to build something even bigger by then.