Soviet atomic bomb project The Soviet project to develop an atomic bomb ( Russian : Создание советской атомной бомбы ) was a top secret research and development program begun during World War II , in the wake of the Soviet Union ' s discovery of the American , British , and Canadian nuclear project . This scientific research was directed by Soviet nuclear physicist Igor Kurchatov , while the military logistics and intelligence efforts were undertaken and managed by NKVD director Lavrentiy Beria . The Soviet Union benefited from highly successful espionage efforts on the part of the Soviet military intelligence ( GRU ) . During World War II , the program was started by Joseph Stalin who received a letter from physicist Georgy Flyorov urging him to start the research , as Flyorov had long suspected that many of the Allied powers were already secretly working on a weapon after the discovery of nuclear fission in 1939 . However , because of the bloody and intensified war with Nazi Germany , large scale efforts were prevented . The Soviets accelerated the program after the American atomic bombings of Hiroshima and Nagasaki . The Soviet atomic project was charged with gathering intelligence on the German nuclear energy project as well as the American nuclear efforts . After the war , the Soviet Union expanded its research facilities , military reactors , and employed many scientists . Greatly aided by its successful " Soviet Alsos " and the atomic spy ring , the Soviet Union conducted its first weapon test of an implosion - type nuclear device , RDS - 1 , codename " First Lightning " , on 29 August 1949 , at Semipalatinsk , Kazakh SSR . With the success of this test , the Soviet Union became the second nation after the United States to detonate a nuclear device . Nuclear physics in the Soviet Union . In early 1930s , the Soviets were instrumental to the advancement of nuclear physics . The initial Soviet interest in nuclear physics had begun in the early 1930s , an era in which a variety of important nuclear discoveries and achievements were made such as ( the identification of the neutron and proton as fundamental particles , the operation of the first cyclotron to energies of over 1 MeV , and the first " splitting " of the atomic nucleus by John Cockcroft and Ernest Walton ) . Even before the Russian revolution and the February Revolution , the mineralogist Vladimir Vernadsky had made a number of public calls for a survey of Russia ' s uranium deposits . The main motivation for nuclear research at the time was radium , which had scientific as well as medical uses , and could be retrieved from borehole water from the Ukhta oilfields . After the discovery of nuclear fission in the late 1930s , Soviet scientists , like scientists all over the world , realized that nuclear reactions could , in theory , be used to release large amounts of binding energy . As in the West , the news of fission created great excitement amongst Soviet scientists and many physicists switched their lines of research to those involving nuclear physics , as it was considered a promising field of research . Soviet nuclear research was not far behind Western scientists : Yakov Frenkel did the first theoretical work on fission in the Soviet Union in 1940 , and Georgy Flyorov and Lev Rusinov concluded that 3±1 neutrons were emitted per fission only days after similar conclusions had been reached by the team of Frédéric Joliot - Curie . Beginnings of the program . Soviet physicist Georgy Flyorov noticed that in spite of the progress German , British and American physicists had made in research into uranium fission , scientific journals had ceased publishing papers on the topic . Flyorov deduced that this meant such research had been classified , and wrote to Stalin in April 1942 . He cited the lack of response he had himself encountered trying to generate interest in similar research , and warned Stalin of the consequences of the development of atomic weapons : " . . . the results will be so overriding [ that ] it won ' t be necessary to determine who is to blame for the fact that this work has been neglected in our country " . By September 1942 , Stalin , who had already been presented with evidence of the Western nuclear programs , decided to launch a Soviet program to develop an atomic bomb headed by Igor Kurchatov . Creation in 1943 of Laboratory No . 2 under the Academy of Sciences of the USSR under management of Igor Kurchatov was the first stage of the Soviet atomic bomb project . In the wake of the atomic bombing of the Japanese cities of Hiroshima and Nagasaki Stalin made the decision to accelerate research and development , expanding the development of military nuclear reactors and research facilities all over the country . On April 9 , 1946 the Council of Ministers of the USSR adopted the resolution on creation of Design Office # 11 ( KB - 11 ) to develop an atomic bomb . Administration and personnel . Initially in 1940 , the administration of this program was given to the Soviet Ministry of Foreign Affairs with Foreign Minister Vyacheslav Molotov being its first administrator . Stalin and Molotov tasked the USSR Academy of Sciences to find a science administrator notable for leading the research in nuclear physics . Abram Fedorovich Ioffe recommended Igor Kurchatov to Molotov , and Molotov advised Stalin to appoint Kurchatov as the formal scientific head of the nascent Soviet nuclear weapons programme . Other important figures included Yuli Khariton , Yakov Zeldovich , Abram Fedorovich Ioffe , Georgii Flyorov , and the future dissident and lead theoretical designer of the hydrogen bomb , Andrei Sakharov . In 1944 , Stalin handed over the program to the People ' s Commissariat for Internal Affairs ( NKVD ) and Molotov was replaced by Lavrentii Beria , Chief of NKVD . Under the ruthless Beria , the NKVD aided atomic spies of the ring . Beria also infiltrated the German nuclear program . Immediately after the end of WW II , many notable figures in the German nuclear program were forcibly taken to the Soviet Union where they greatly enhanced the Soviet nuclear weapons efforts . Espionage . Soviet atomic ring . The Soviet atomic project benefited from highly successful espionage efforts on the part of the " Glavnoye Razvedyvatel ' noye Upravleniye " ( GRU ) as well as the foreign intelligence department of the " Narodnyy komissariat vnutrennikh del " ( NKVD ) . Evidence from intelligence sources in the United Kingdom had a role to play in the decision of the Soviet State Defense Council ( " Gosudarstvennyj komitet oborony " ( GKO ) ) , in September 1942 , to approve resolution 2352 , which signaled the beginning of the Soviet atom bomb project . Through sources in the Manhattan Project , notably Klaus Fuchs , the Soviet intelligence obtained important information on the progress of the United States atomic bomb effort . Intelligence reports were shown to the head of the Soviet atomic project and had a significant impact on the direction of Soviet research . For example , Soviet work on methods of uranium isotope separation was altered when it was reported , to Kurchatov ' s surprise , that the Americans had opted for the Gaseous diffusion method . While research on other separation methods continued throughout the war years , the emphasis was placed on replicating U . S . success with gaseous diffusion . Another important breakthrough , attributed to intelligence , was the possibility of using plutonium , instead of uranium , in a fission weapon . Extraction of plutonium in the so - called " uranium pile " allowed the bypass of the difficult process of uranium separation altogether — something that Kurchatov had learned from intelligence from the Manhattan project . Soviet intelligence management in Manhattan Project . In 1945 , the Soviet intelligence obtained rough " blueprints " of the first U . S . atomic device . Alexei Kojevnikov has estimated , based on newly released Soviet documents , that the primary way in which the espionage may have sped up the Soviet project was that it allowed Khariton to avoid dangerous tests to determine the size of the critical mass : " tickling the dragon ' s tail " , as it was called in the U . S . , consumed a good deal of time and claimed at least two lives ; see Harry K . Daghlian , Jr . and Louis Slotin . One of the key pieces of information , which Soviet intelligence obtained from Fuchs , was a cross - section for D - T fusion . This data was available to top Soviet officials roughly three years before it was openly published in the Physical Review in 1949 . However , this data was not forwarded to Vitaly Ginzburg or Andrei Sakharov until very late , practically months before publication . Initially both Ginzburg and Sakharov estimated such a cross - section to be similar to the D - D reaction . Once the actual cross - section become known to Ginzburg and Sakharov , the Sloika design become a priority , which resulted in successful test in 1953 . In the 1990s , with the declassification of Soviet intelligence materials , which showed the extent and the type of the information obtained by the Soviets from US sources , a heated debate ensued in Russia and abroad as to the relative importance of espionage , as opposed to the Soviet scientists ' own efforts , in the making of the Soviet bomb . The vast majority of scholars agree that whereas the Soviet atomic project was first and foremost a product of local expertise and scientific talent , it is clear that espionage efforts contributed to the project in various ways and most certainly shortened the time needed to develop the atomic bomb . Comparing the timelines of H - bomb development , some researchers came to a conclusion that Soviets had a gap in access to classified information regarding the H - bomb at least between late 1950 and some time in 1953 . Earlier , e . g . in 1948 , Fuchs gave to the Soviets a detailed update of the classical super progress , including an idea to use lithium , but did not specify it was specifically lithium - 6 . Teller accepted the fact that " classical super " scheme was infeasible by 1951 , following results obtained by various researches ( including Stanislaw Ulam ) and calculations performed by John von Neumann in late 1950 . Yet the research for the Soviet analogue of " classical super " continued until December 1953 , when the researchers were reallocated to a new project working on what later became a true H - bomb design , based on radiation implosion . It remains an open topic for research , whether the Soviet intelligence was able to obtain any specific data on Teller - Ulam design in 1953 or early 1954 . Yet , Soviet officials directed the scientists to work on a new scheme , and the entire process took less than two years , commencing around January 1954 and producing a successful test in November 1955 . It also took just several months before the idea of radiation implosion was conceived , and there is no documented evidence claiming priority . It is also possible that Soviets were able to obtain a document lost by John Wheeler on a train in 1953 , which reportedly contained key information about thermonuclear weapon design . Logistical problems the Soviets faced . The single largest problem during the early Soviet project was the procurement of uranium ore , as the USSR had no known domestic sources at the beginning of the project . The Soviet F - 1 reactor , which began operation in December 1946 , was fueled using uranium confiscated from the remains of the German atomic bomb project . This uranium had been mined in the Belgian Congo , and had fallen into the hands of the Germans after their invasion and occupation of Belgium in 1940 . Further sources of uranium in the early years of the program were mines in East Germany ( SAG Wismut ) , Czechoslovakia , Bulgaria , Romania ( near Stei ) and Poland . Eventually large domestic sources were discovered . The uranium for the Soviet nuclear weapons program came from the following countries in the years 1945 to 1950 ( mine production only ) : Important Soviet nuclear tests . RDS - 1 . RDS - 1 , the first Soviet atomic test was internally code - named " First Lightning " ( " Первая молния " , or Pervaya Molniya ) August 29 , 1949 , and was code - named by the Americans as " Joe 1 " . The design was very similar to the first US " Fat Man " plutonium bomb , using a TNT / hexogen implosion lens design . RDS - 2 . On September 24 , 1951 , the 38 . 3 kiloton device RDS - 2 was tested based on a tritium " boosted " uranium implosion device ( not a gun - type design like the US " Little Boy " bomb ) with a levitated core . This test was code named Joe - 2 by American analysts . RDS - 3 . On October 18 , 1951 , the 41 . 2 kiloton device RDS - 3 was detonated , a boosted weapon using a composite construction of levitated plutonium core and a uranium - 235 shell . Code named Joe - 3 in the USA , this was the first Soviet air - dropped bomb test . Released at an altitude of 10 km , it detonated 400 meters above the ground . RDS - 4 . RDS - 4 represented a branch of research on small tactical weapons . It was a boosted fission device using plutonium in a " levitated " core design . The first test was an air drop on August 23 , 1953 , yielding 28 kilotons . The RDS - 4 comprised the warhead of the R - 5M medium - range ballistic missile , which was tested with a live warhead for the first and only time on February 2 , 1956 . The RDS - 5 was a similar levitated core design but with a composite plutonium core and uranium 235 shell . RDS - 6 . RDS - 6 , the first Soviet test of a hydrogen bomb , took place on August 12 , 1953 and was nicknamed " Joe 4 " by the Americans . It used a layer - cake design of fission and fusion fuels ( uranium 235 and lithium - 6 deuteride ) and produced a yield of 400 kilotons , mostly from neutron - initiated fission rather than fusion . RDS - 9 . A much lower - power version of the RDS - 4 with a 3 - 10 kiloton yield , the RDS - 9 was developed for the T - 5 nuclear torpedo . A 3 . 5 kiloton underwater test was performed with the torpedo on September 21 , 1955 . RDS - 37 . The first Soviet test of a " true " hydrogen bomb in the megaton range was conducted on November 22 , 1955 . It was dubbed " RDS - 37 " by the Soviets . It was of the multi - staged , radiation implosion thermonuclear design called " Sakharov ' s " Third Idea " " in the USSR and the Teller - Ulam design in the USA . Joe 1 , Joe 4 , and RDS - 37 were all tested at the Semipalatinsk Test Site in Kazakhstan . Tsar Bomba ( RDS - 220 ) . The Tsar Bomba ( Царь - бомба ) was the largest , most powerful nuclear weapon ever detonated . It was a three - stage hydrogen bomb with a yield of about 50 megatons . This is equivalent to ten times the amount of all the explosives used in World War II combined . It was detonated on October 30 , 1961 , in the Novaya Zemlya archipelago , and was capable of approximately 100 megatons , but was purposely reduced shortly before the launch . Although weapon ized , it was not entered into service ; it was simply a demonstrative testing on the capabilities of the Soviet Union ' s military technology at that time . The explosion was hot enough to induce third degree burn s at 100 km distance . Chagan . Chagan was a shot in the Nuclear Explosions for the National Economy or Project 7 , the Soviet equivalent of the US " Operation Plowshare " to investigate peaceful uses of nuclear weapons . It was a subsurface detonation , and was fired on January 15 , 1965 . The site was a dry bed of the Chagan River at the edge of the Semipalatinsk Test Site , and was chosen such that the lip of the crater would dam the river during its high spring flow . The resultant crater had a diameter of 408 meters and was 100 meters deep . A major lake ( 10 , 000 m³ ) soon formed behind the 20 – 35 m high upraised lip , known as " Chagan Lake " or " Balapan Lake " . The photo is sometimes confused with RDS - 1 in literature . Secret cities . During the Cold War the Soviet Union created at least ten closed cities , known as Atomgrads , in which nuclear weapons - related research and development took place . After the dissolution of the Soviet Union , all of the cities changed their names ( most of the original code - names were simply the oblast and a number ) . All are still legally " closed " , though some have parts of them accessible to foreign visitors with special permits ( Sarov , Snezhinsk , and Zheleznogorsk ) . Environmental and public health effects . The Soviets started experimenting with nuclear technology in 1943 , and first tested a nuclear weapon in August 1949 . Many of the fission based devices left behind radioactive isotopes which have contaminated air , water and soil in the areas immediately surrounding , downwind and downstream of the blast site . According to the records that the Russian government released in 1991 , the Soviet Union tested 969 nuclear devices between 1949 and 1990 . Soviet scientists conducted the tests with little regard for environmental and public health consequences . The detrimental effects that the toxic waste generated by weapons testing and processing of radioactive materials are still felt to this day . Even decades later , the risk of developing various types of cancer , especially that of the thyroid and the , continues to be elevated far above national averages for people in affected areas . Iodine - 131 , a radioactive isotope that is a major byproduct of fission - based weapons , is retained in the thyroid gland , and so poisoning of this kind is commonplace in impacted populations . The Soviets set off 214 nuclear bombs in the open air between 1949 and 1962 , when the United Nations banned atmospheric tests worldwide . The billions of radioactive particles released into the air exposed countless people to extremely mutagenic and carcinogenic materials , resulting in a myriad of deleterious genetic maladies and deformities . The majority of these tests took place at the Semipalatinsk Test Site , or STS , located in northeast Kazakhstan . The testing at STS alone exposed hundreds of thousands of Kazakh citizens to the harmful effects , and the site is continues to be one of the most highly irradiated places on the planet . When the earliest tests were being conducted , even the scientists had only a poor understanding of the medium and long term effects of radiation exposure . In fact , the STS was chosen as the primary site for open air testing precisely because the Soviets were curious about the potential for lasting harm that their weapons held . Contamination of air and soil due to atmospheric testing is only part of a wider issue . Water contamination due to improper disposal of spent uranium and decay of sunken nuclear - powered submarines is a major problem in the Kola Peninsula in northwest Russia . Although the Russian government states that the radioactive power cores are stable , various scientists have come forth with serious concerns about the 32 , 000 spent nuclear fuel elements that remain in the sunken vessels . There have been no major incidents other than the explosion and sinking of a nuclear - powered submarine in August 2000 , but many international scientists are still uneasy at the prospect of the hulls eroding , releasing uranium into the sea and causing considerable contamination . Although the submarines pose an environmental risk , they have yet to cause serious harm to public health . However , water contamination in the area the Mayak test site , especially at Lake Karachay , is extreme , and has gotten to the point where radioactive byproducts have found their way into drinking water supplies . It has been an area of concern since the early 1950s , when the Soviets began disposing of tens of millions of cubic meters of radioactive waste by pumping it into the small lake . Half a century later , in the 1990s , there are still hundreds of millions of curies of waste in the Lake , and at points contamination has been so severe that a mere half hour of exposure to certain regions would deliver a dose of radiation sufficient to kill 50 % of humans . Although the area immediately surrounding the lake is devoid of population , the lake has the potential to dry up in times of drought . Most significantly , in 1967 , it dried up and winds carried radioactive dust over thousands of square kilometers , exposing at least 500 , 000 citizens to a range of health risks . To control dust , Soviet scientists piled concrete on top of the lake . Although this was effective in helping mediate the amount the amount of dust , the weight of the concrete pushed radioactive materials into closer contact with standing underground groundwater . It is tough to gauge the overall health and environmental effects of the water contamination at Lake Karachay because figures on civilian exposure are unavailable , making it hard to show causation between elevated cancer rates and radioactive pollution specifically from the lake . Contemporary efforts to manage radioactive contamination in the Soviet Union are few and far between . Public awareness of the past and present dangers , as well as the Russian government ' s investment in current clean up efforts , are likely dampened by the lack of media attention STS and other sites have gotten in comparison to isolated nuclear incidents such as Hiroshima , Nagasaki , Chernobyl and Three - Mile Island . The domestic government ' s investment in cleanup measures seems to be driven by economic concerns rather than care for public health . The most significant political legislation in this area is a bill agreeing to turn the already contaminated former weapons complex Mayak into an international radioactive waste dump , accepting cash from other countries in exchange for taking their radioactive byproducts of nuclear industry . Although the bill stipulates that the revenue go towards decontaminating other test sites such as Semipalatinsk and the Kona Peninsula , experts doubt whether this will actually happen given the current political and economic climate in Russia .