If I had to have a wild guess (could be wrong) I would say it's from the Sosnovy Bor plant near St. Petersburg. https://en.wikipedia.org/wiki/Leningrad_Nuclear_

If I had to have a wild guess (could be wrong) I would say it's from the Sosnovy Bor plant near St. Petersburg. https://en.wikipedia.org/wiki/Leningrad_Nuclear_Power_Plant https://en.wikipedia.org/wiki/Leningrad_Nuclear_Power_Plant There is ongoing work to decommission the last Chernobyl style reactors by 2025. Hope it's all going safely!