Yefim Pavlovich Slavsky

Until the end of World War II, Slavsky was a nonferrous-metals factory manager. He ran the Dnieper Aluminum Plant in Zaporozhye and the Ural Aluminum Plant in Kamensk-Uralsky, becoming Deputy People's Commissar for Nonferrous Metallurgy in 1945. In 1946 he was abruptly appointed deputy head of the First Main Directorate (PGU), the secret nuclear-weapons organ overseen by Lavrenty Beria, and thrown into the atomic bomb project. In 1947 Slavsky was sent to the top-secret Combine No. 817 under construction at Chelyabinsk-40 (now Ozyorsk) in the southern Urals, serving as its director and chief engineer. The site housed the USSR's first industrial-scale reactor and plutonium separation facilities. On 29 August 1949 the first Soviet atomic bomb, RDS-1, fueled by plutonium from Combine No. 817, was successfully detonated at Semipalatinsk. For this achievement Slavsky received his first Hero of Socialist Labor, alongside Vasily Vannikov, Igor Kurchatov, and Yulii Khariton, and a Stalin Prize. The experience transformed him from a production manager of aluminum into a central figure of nuclear weapons development and laid the political and technical foundation for his command of the entire Soviet nuclear industry for nearly thirty years.

On September 29, 1957, a cooling failure caused a radioactive waste storage tank to explode at the Mayak complex (Combine No. 817), the very facility where Slavsky had overseen plutonium production. An estimated 2 million to 20 million curies of radiation were released into the atmosphere, creating the 'East Ural Radioactive Trace,' a contaminated corridor 300 km long and up to 50 km wide. It remained the world's largest nuclear accident until Chernobyl.

Slavsky immediately took charge of the liquidation. He ordered the emergency evacuation of over 10,000 residents from contaminated settlements such as Ochersk and Chernyabsk, and personally directed the excavation and burial of highly radioactive topsoil. By spring 1958, extensive civil engineering works were underway to isolate Lake Karachay and the Techa River system, the most heavily contaminated water bodies. The burial-enclosure techniques and exclusion-zone protocols developed under Slavsky's command at Kyshtym were applied directly at Chernobyl three decades later.

As was his habit, Slavsky moved through high-radiation zones wearing only standard protective clothing. Doctors later estimated his cumulative lifetime exposure at roughly 1,500 roentgen, three times the lethal dose. The decision to conceal the accident from the public was a political one taken by Khrushchev and the Central Committee; Slavsky's role was that of the field commander focused solely on containment and remediation. The Kyshtym liquidation became the foundational precedent for the Soviet nuclear industry's emergency-response framework.

When the Chernobyl nuclear power plant's No. 4 reactor accident occurred on 26 April 1986, Slavsky, then 87, was placed in charge of the construction committee responsible for liquidating its consequences and sent to the site. He travelled to Pripyat to assess the damage himself, and the surviving record is that he conceived the plans for the shelter structure (sarcophagus) that would cover the ruined reactor. The attribution of the sarcophagus design to him is best presented as that source's account rather than as an uncontested engineering credit.

The Chernobyl liquidation became the end point of his ministerial career. On 21 November 1986, aged 88, he was sent into retirement and became a personal pensioner of union significance; Ukrainian reference material likewise records that from November 1986 he lived as such a pensioner in Moscow.

How that departure should be explained, however, is contested. RIA Novosti reports that he was deeply affected by the Chernobyl accident but did not leave because of it; rather, he left because "the wrong people" came to power, and his relations with Mikhail Gorbachev had been bad since Gorbachev's Stavropol period. English Wikipedia records that he retired from the ministry after Chernobyl, and that many speculated his retirement was not his own choice and that he had been ousted from the Soviet cabinet. Whether the retirement was voluntary and whether the accident caused it are therefore presented here as differing accounts rather than as settled fact. The decontamination and exclusion techniques built up during the 1957 Kyshtym cleanup appear to have been applied again at Chernobyl, so that two large nuclear accidents, in 1957 and in 1986, both fell under his responsibility. The retirement of 1986 was the last official post of a man who had led the Soviet nuclear industry for 29 years.