[TOP SECRET] Report on the Progression and Dispersion of the Accident at Chernobyl Nuclear Power Plant (Revised Edition)
Document Number: CHN-1986-04-26-TOP-SECRET
Security Clearance: State Secret Class 1 (For Review by KGB and General Secretary Only)
Drafting Agency: Special Commission of Inquiry of the Union of Soviet Socialist Republics
Date: April 28, 1986 (06:00)
1. Accident Overview and Primary Explosion (01:23:44 ~ 01:23:47)
* Cause: Power Excursion during turbine inertial coasting (rundown) experiment at Unit 4.
* Progression:
* Confirmed insertion of positive reactivity due to design flaws immediately following the actuation of the Emergency Shutdown Button (AZ-5).
* Steam pressure exceeded critical limits. Vertical displacement of the 2,000-ton Upper Biological Shield ("Elena").
* Primary steam explosion followed by secondary hydrogen explosion.
* Result: Complete exposure of Unit 4 core and ignition of graphite moderator.
2. Secondary Steam Explosion and Chain Damage (01:40 ~ 02:15)
* Situation: Confirmation of fatal chemical reaction caused by firefighting water and coolant injected during the initial response.
* Mechanism of Occurrence:
* Massive influx of fire suppression water into the lower Bubbler Pool.
* Molten core fuel (Corium) penetrated the lower slab and made contact with pooled water.
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* Instantaneous vaporization caused an ultra-high-pressure steam explosion.
* Damage Propagation:
* Shockwaves transmitted to adjacent Units 1, 2, and 3 via shared ventilation systems and underground cable tunnels.
* Confirmed structural failure of Unit 3 cooling systems. Forced ingress of radioactive particulates into operating units.
3. Extent of Damage and Environmental Contamination Status
* Core Status:
* Unit 4: Total Loss of Core.
* Unit 3: Severe overheating in progress due to coolant loss resulting from shockwave impact.
* Radiation Levels:
* Estimated to exceed 15,000 Roentgen (R)/hour within a 1km radius of the plant.
* Initial report of 3.6 R/h was an error due to dosimeter operational limits. Actual levels are estimated at hundreds of times the lethal dose.
* Structural Status: Total loss of facility containment. Continuous release of radioactive nuclides into the atmosphere.
4. External Information Control and Counter-Detection Guidelines
* Basic Policy: Regard atmospheric detection by Western nations (Scandinavia and Northern Europe) as "certain"; establish active deception protocols.
* Counter-Logic for Nuclide Detection:
* Upon detection of Iodine-131/Cesium-137: Disseminate disinformation attributing readings to "minor leakage from Western research reactors" or "temporary descent of existing pollutants due to unidentified meteorological phenomena."
* Upon detection of Xenon (Xe)/Krypton (Kr): Downplay as "simple ventilation error in cooling systems."
* Geopolitical Blockade:
* Distort meteorological data transmissions near border regions (Poland, etc.) to confuse fallout trajectory analysis.
* Deny IAEA access to Unit 4 citing "National Security and Military Facility" status. Submit only fabricated normal operation data for Units 1 and 2.
* Propaganda Directives:
* Domestic: Loop broadcasts stating "Fire extinguished, situation under total control." Prevent civil unrest.
* International: If acknowledgement is unavoidable, limit scope to "minor turbine room fire." Categorically deny core meltdown and massive release of radioactive materials.
5. Technical Conclusions and Strategic Urgent Measures
* Potential Risk: Possibility of a "megaton-class tertiary steam explosion" capable of physically striking all of Europe remains if Corium contacts residual water in the Bubbler Pool.
* Emergency Measures (Liquidators):
* Forced deployment of personnel into high-radiation zones. Manual operation of pumps and underground concrete injection.
* Exposure records and personal identities of deployed personnel to be permanently expunged post-operation.
* Disposition of Unit 3:
* Internal damage is severe, but technical failure cannot be admitted.
* Secretly designate Unit 3 as a "Sealed High-Level Radiation Zone" while maintaining the external pretense of normal operation alongside Units 1 and 2.
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