The Chornobyl Deception Part 1: Lies and Fabrications

How the Soviet Union lied about Its worst nuclear disaster – and how the West helped. Make us preferred on Google Share Facebook X (Twitter) LinkedIn Bluesky Email Copy Copied Photo by EBRD Content Share Facebook X (Twitter) LinkedIn Bluesky Email Copy Copied Flip Make us preferred on Google In the spring of 1986, helicopter crews flew more than 1,800 sorties over the burning Chornobyl reactor, initially dumping 5,020 metric tons of sand, clay, lead, and boron into the inferno. Soviet officials called this the defining act of heroism that smothered the fire and saved the world from far worse contamination. The international nuclear establishment endorsed the claim. One problem: almost none of the material reached the reactor core. The pilots had been told to aim for a “red glow” inside the shattered reactor building. That glow turned out to be fragments of the core hurled about 12 meters east of the reactor shaft by the initial explosion. The actual core – 135 metric tons of uranium fuel, 71 percent of the total load – sat exposed and burning in the shaft below, untouched by the helicopters. Today, in the reactor’s central hall, a mound of sand and debris stands over the now cold “red glow” as an eerie monument to misdirected courage. Follow our coverage of the war on the @Kyivpost_official . Soviet officials did not merely fail to correct this error. They lied – at international conferences, in official reports, through personal assurances – for a decade. And the International Atomic Energy Agency, the world’s nuclear safety watchdog, helped them do it. I spent 18 months living and working inside the Chornobyl 30-km exclusion zone as the first Western scientist permitted to join the team of Russian and Ukrainian researchers studying the destroyed reactor. What I found contradicted the official narrative at nearly every turn. Other Topics of Interest Zelensky Marks 40th Anniversary of Chornobyl with Call to End Russian Nuclear Terrorism President Zelensky warned that Russian-Iranian drone attacks near the station’s confinement structure are pushing the world toward a new man-made disaster on the disaster’s 40th anniversary. What actually happened inside Unit 4 The Chornobyl accident on April 26, 1986, destroyed Unit 4 of the Chornobyl Nuclear Power Station in Ukraine. Reactor design flaws, a reckless safety culture, and multiple operator violations triggered a steam explosion and complete core meltdown. Radioactive contamination spread across Ukraine, Belarus, and Russia and registered on instruments across the northern hemisphere. Within hours, Soviet authorities formed a Governmental Commission to manage the crisis. No emergency plans were in place for an accident of this magnitude. Sergei Shirokov, head of the Nuclear Energy Division at the Ukrainian Ministry of Energy, told me that Moscow had no official information about what had happened until midday on April 27 – more than 36 hours after the explosion. People at the station had surveyed the ruins that first morning, but they were either afraid to report what they saw or simply weren’t believed. Through most of the first day, a key Soviet energy official, Gennady Shasharin, believed the core was being cooled effectively by water. On this and other incomplete information, central authorities delayed the evacuation of nearby residents. They didn’t want panic on their hands. The helicopter campaign became the centerpiece of the Soviet heroic narrative. In August 1986, Academician Valery Legasov, who headed the Soviet delegation to the International Atomic Energy Agency (IAEA) meeting in Vienna, presented the operation as a success to an international audience. The physical evidence told a different story. The explosion had blown the 2,000-metric-ton Upper Biological Shield – the reactor’s massive lid, affectionately called “Yelena” – to a cockeyed angle above the reactor shaft, blocking any aerial view of the core itself. Scientists who later entered Unit 4 at great personal risk took about 200 bore samples and conducted extensive visual and robotic observations. Their conclusion was unambiguous: virtually none of the helicopter material entered the core shaft. Only traces appeared in the lava-like fuel remnants below. Had any significant quantity reached the core, its chemical signature would be embedded in the solidified fuel. It wasn’t. The core burned – exposed to the open atmosphere for about nine days. It melted through the reactor’s lower structures and flowed into the basement levels of the building, where – without any direct human intervention – it cooled and solidified into lava-like substances now known as fuel-containing materials, or corium. “The people would not understand” At Vienna, Legasov faced data showing that radioactivity releases had increased on April 30 and May 1 – days after the helicopter campaign was supposed to have smothered the fire. His reported response was revealing: “The people would not understand. We have to be seen [to be] doing something.” Later that year, Legasov told the Soviet Academy of Sciences: “I did not lie at Vienna, but I did not tell the whole truth.” On April 26, 1988 – two years to the day after the accident – Legasov hanged himself at home. He was right to be anguished. Soviet officials had had ample time between the accident and the August meeting to examine the remains of Unit 4 and determine that the core had not been covered. Overhead photographs made this obvious. Maintaining the fiction at Vienna was not a failure of measurement. It was a choice. The consequences of the cover-up fell not on institutions but on people. If the core burned exposed for nine days rather than being smothered within the first few, then more radioactive material escaped into the environment than the Soviets admitted. The official Soviet figure, presented in Vienna, stood at about 50 million curies (MCi). My source-term analysis – based on isotopic release modeling constrained by measured data from within the Sarcophagus – placed the total at roughly 80–100 MCi for the isotopes I analyzed, about twice the official claim. Swedish investigator Lennart Devell’s independent work, which included additional volatile isotopes not covered in my analysis, placed the total approaching 200 MCi.  These are not competing estimates; they cover different isotopic inventories and reinforce the same conclusion: the official figure was a gross understatement. The marked increases in childhood thyroid cancers documented in Belarus and Ukraine in subsequent years are consistent with releases on this scale. The radioisotope release profiles revealed a further damning detail. The normalized releases of 17 analyzed isotopes were surprisingly close in magnitude – a roughly isothermal pattern. This directly contradicts the Soviet narrative of a controlled quenching, which would have produced a sharply non-uniform isotopic signature. The physics of the release fingerprint refutes the official story on its own terms. The deception extended to the structure built to contain the wreckage. Soviet authorities portrayed the Sarcophagus – constructed over Unit 4 by November 1986 – as a massive concrete-and-steel engineering triumph that tightly retained all radioactive debris and protected the surrounding environment. Officials insisted that 96.5 percent of the initial fuel load sat safely inside. The arithmetic didn’t hold. Soviet sources reported that between 300,000 and 410,000 cubic meters of concrete were used in construction. Take the cube root of those volumes: a solid block of concrete measuring 67 to 74 meters on each side – larger and taller than the Sarcophagus itself, which was mostly empty space. The structural drawings I examined on site showed that the actual amount used was about 161,000 cubic meters, much of which leaked through holes in the reactor building onto the surrounding ground. Simple arithmetic demolished the claim. The Sarcophagus was a steel tent hastily erected over ruins, not a concrete encasement. It was never hermetically sealed. It couldn’t reliably withstand the high wind loads or earthquakes possible in the region. The European Bank for Reconstruction and Development (EBRD) eventually spent over $1 billion to construct a 300-foot-high “New Safe Confinement” over the deteriorating structure, completed in 2017. The claim that 96.5% of the fuel remained inside the Sarcophagus was a political decision disguised as a scientific finding. Preliminary analyses of hot particles detected in Sweden and Germany indicated that 3-6% of the core mass had escaped beyond the station boundaries. Soviet officials subtracted this from the total and declared the remainder accounted for. No one conducted a comprehensive inventory. The instruments used to locate the fuel told their own story. Soviet authorities employed the Igla system – a wand-like detector lowered from a helicopter – to measure radiation inside the reactor building. Based on its readings, they concluded that the largest concentration of fuel lay in the reactor core shaft. Someone prepared an internal document detailing fuel locations and quantities, apparently for the August 1986 IAEA meeting. Years later, when researchers entered the Central Hall to examine the reactor remains, they found the Igla detector wand jutting partially out of the southern spent-fuel pool – about 12 meters from the reactor shaft. It had been measuring the wrong location. The core shaft was virtually empty. The detector remains there to this day. In part 2, read about the Soviet Union’s suppression of information, the IAEA’s role, the cost of deception, and what Chornobyl reveals. Alexander Sich holds a PhD. in Nuclear Engineering from MIT and an MA in Soviet Studies from Harvard. He authored the Chornobyl chapter in the “Encyclopedia of Nuclear Energy” and was the first Western nuclear engineer permitted to live and work with the Russian and Ukrainian scientists studying the destroyed reactor inside the Chornobyl Exclusion Zone, where he spent 18 months conducting research underpinning this article. Alexander Sich holds a PhD. in Nuclear Engineering from MIT and an MA in Soviet Studies from Harvard. He authored the Chornobyl chapter in the “Encyclopedia of Nuclear Energy” and was the first Western nuclear engineer permitted to live and work with the Russian and Ukrainian scientists studying the destroyed reactor inside the Chornobyl Exclusion Zone, where he spent 18 months conducting research underpinning this article.