You're missing at least three other major events.

Sarov in 1997

Mayak Production Association in 2017 - nobody knows what happened to this day because Russia refuses to release any info about it but it was a huge release - over 100–300 TBq of ruthenium-106.

There's the Nyonoksa explosion in 2019.

Also, we might as well count Hanaford, because of massive amounts of radioactive material released starting in the 40's that continued until the plant was shut down.

Furthermore, the site is costing us $2BN a year and will until roughly 2040. $2BN would be enough to install around 2GW of solar good for roughly 3–6 TWh/year. 450,000–500,000 "homes" worth of additional capacity.