A drone struck the turbine building adjacent to reactor 6 at ZNPP on 30-31 May. IAEA inspectors on site confirmed debris and a damaged metal hatch; radiation levels remained normal. ZNPP's six reactors are in cold shutdown with fuel cooling pools stable, and the turbine building houses steam turbines rather than the reactor vessel or spent-fuel pools, so the strike does not threaten a radiological release under current conditions.
The risk calculus shifts if the single remaining 330 kV backup line fails. IAEA Update 352 does not report current diesel reserve levels, itself a data gap. The 12-hour communications blackout on 27 May meant inspectors lost real-time contact with Vienna during active hostilities around the plant, an operational vulnerability regardless of radiological status.
The main 750 kV Dniprovska line has now been disconnected for over 70 days, approaching the threshold at which the IAEA classifies the situation as a sustained safety event rather than a recurring incident. No sixth repair ceasefire has been brokered despite Rafael Grossi's continued negotiations.
Both sides deny responsibility. Ukraine's Foreign Ministry asked why it would strike its own plant, the standard response, but it does not advance attribution; IAEA policy is to document damage, not assign blame. The 750 kV line went down in mid-May, and Rosatom had already attacked IAEA credibility on 17 May as the outage hit 60 days; the reactor-building strike is the next step in that deteriorating pattern.
