This is amazing and terrible. Thank you. Biggest takeaway for me, that accidents happened BEFORE:
Archival files indicate that accidents at the station happened before. So, in 1982, a significant release of radioactive substances occurred at the first power unit. The KGB report on this ends with the phrase "measures have been taken to prevent panic and provocative rumors." In 1984, there were emergencies at power units 3 and 4.