How Russia fires dangerously close near Ukraine's nuclear facilities | DW News

Key Concepts

• Nuclear Terrorism: The deliberate targeting or intimidation of nuclear facilities to create fear and instability.
• Grid Instability: The fluctuation in power supply caused by damage to high-voltage lines and substations, forcing nuclear plants to adjust output rapidly.
• Active Cooling: The essential process of circulating coolant through a reactor to prevent fuel overheating, which requires a constant supply of electricity.
• Cold Shutdown: A state where a reactor is shut down, and the coolant is at atmospheric pressure and below boiling temperature, reducing the risk of a pressure-driven explosion.
• Kinjal Missiles: High-speed Russian ballistic missiles capable of reaching nuclear sites in seconds, used as a tool of intimidation.
• IAEA (International Atomic Energy Agency): A technical body with limited political leverage to enforce safety zones around nuclear sites.

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1. Operational Challenges at Nuclear Power Plants

Engineers at the Khmelnytskyi Nuclear Power Plant are operating under constant duress due to Russia’s systematic targeting of Ukraine’s energy infrastructure.

• Grid Balancing: Workers must frequently adjust power output (e.g., reducing to 75% capacity) within minutes to prevent grid overload or instability caused by damaged substations.
• Emergency Protocols: If external power is lost, plants must rely on diesel generators to maintain cooling. Reconnecting to the grid after a total disconnection can take up to a full day.
• Human Impact: The psychological toll is significant. Staff are now required to remain in the control room for the duration of their shifts, with food brought to them, as the environment is too unstable to allow for breaks.

2. The Threat of Direct Hits and Intimidation

Despite the risk of radioactive contamination spreading to Russian territory, Russian forces continue to fly missiles and drones dangerously close to Ukrainian nuclear sites.

• Proximity Data: Ukraine’s prosecutor general reported that 35 Kinjal missiles have passed within 20 kilometers of the Khmelnytskyi plant. Some have been recorded as close as 10 kilometers.
• Calculated Intimidation: Many of these missiles fly over the Chernobyl site before approaching active plants, a maneuver interpreted by Ukrainian officials as deliberate psychological warfare.
• Historical Precedent: In 2025, a Russian Shahed drone damaged the steel shielding structure at the Chernobyl site, proving that these facilities are not being given a "wide berth."

3. Technical Risks: Cooling and Meltdown

Ross Peele (King’s College London) explains the technical dangers of losing external power:

• The Cooling Requirement: Nuclear reactors require active cooling even after shutdown. If pumps fail due to a lack of electricity, fuel temperatures rise, potentially leading to material failure and the release of hazardous radioactive material.
• Scale of Disaster: While a meltdown would be catastrophic, experts suggest it might not reach the scale of the 1986 Chernobyl disaster due to differences in reactor design.
• Zaporizhzhia Concerns: Even in "cold shutdown," the Zaporizhzhia plant remains at risk. If cooling systems fail, the lack of pressure does not prevent the eventual release of radioactive material if the fuel overheats.

4. International Leverage and Consequences

• IAEA Limitations: The IAEA is a technical, not political, body. It lacks the mandate or power to enforce a demilitarized zone or stop Russian aggression against these sites.
• Transboundary Fallout: Radioactive contamination does not respect borders. Any release of material would be carried by high-level winds and waterways, potentially impacting all of Europe and the Russian Federation itself.
• Strategic Importance: Nuclear power currently provides approximately 60–70% of Ukraine’s electricity. It is the only energy source that Russia cannot destroy without risking direct environmental consequences for its own population.

Synthesis and Conclusion

The situation at Ukraine’s nuclear power plants represents a precarious intersection of technical necessity and geopolitical warfare. Because the Soviet-era grid is well-known to Russian planners, they are able to target infrastructure to force nuclear plants into dangerous operational states. The primary takeaway is that the safety of these plants is currently maintained only by the constant, high-stress vigilance of on-site engineers. With international diplomatic efforts largely stalled, the risk of a catastrophic accident remains a persistent threat to the entire region, driven by the unpredictable nature of the ongoing conflict.