Can someone explain why it's going to take so long to fully decommission TMI-2, the old reactor? Reading the commission report, they have about $733m in the de

Can someone explain why it's going to take so long to fully decommission TMI-2, the old reactor? Reading the commission report, they have about $733m in the decommissioning fund, while decommissioning is projected to cost $1B. Active demolition projected to start 2046, completed in 2052. They've started some work on debris demoval, but it looks they're going to take a break 2030-2046 to let the fund accrue (at expected 2% real RoR) enough to get the fund to $1B. Isn't that insane? So from 2030-2046, it will just sit there "mothballed" with a minimum spent on security and so on, just for the fund to gain value?