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Nuclear Last updated: November, 2014

South Korea first became interested in nuclear technology in the 1950s but did not begin construction of its first power reactor until 1970. [1] Changes in the international security environment influenced South Korea's decision to begin a nuclear weapons program in the early 1970s. Under significant pressure from the United States, Seoul abandoned the program and signed the Treaty on the Non-Proliferation of Nuclear Weapons (NPT) in April 1975. Currently, the 1973 Korea-US Atomic Energy Agreement limits South Korea’s nuclear program to an open-ended fuel cycle. Section 123 of the 1954 US Atomic Energy Act prohibits indigenous uranium enrichment, reprocessing used fuel, and restricts raw material imports.

In 1981, South Korean engineers produced five test fuel rods using depleted uranium. The fuel rods were placed in a research reactor and irradiated between July and December 1981. The spent fuel rods were removed and scientists conducted experiments in hot-cells to extract 0.3 grams of plutonium. [2] The South Korean Ministry of Science and Technology (MOST) claimed that this experiment was conducted by "a small group of scientists to analyze the chemical characteristics of plutonium." [3] These experiments were not revealed to the public until the summer of 2004, after South Korea had ratified the Additional Protocol. Under this modified safeguards agreement with the International Atomic Energy Agency (IAEA), South Korean nuclear facilities were subject to more detailed inspections. [4] In the summer of 2004, South Korea also reported that its scientists had conducted laser isotope separation experiments to enrich about 0.2 grams of uranium. Both the plutonium extraction and uranium enrichment experiments were in violation of Seoul's safeguards commitments, but the government cooperated with the IAEA to account for these violations and to ensure there were no future violations. [5] During the June 2008 IAEA Board of Governors meeting, a "broader conclusion" was drawn that all nuclear material in South Korea had been placed under safeguards and remained in peaceful nuclear activities. [6]

In November 1991, President Roh Tae Woo (노태우) declared that South Korea would not "manufacture, possess, store, deploy, or use nuclear weapons." [7] Two months later, North Korea and South Korea signed the Joint Declaration on the Denuclearization of the Korean Peninsula. In this agreement, Seoul and Pyongyang agreed not "to test, manufacture, produce, receive, possess, store, deploy or use nuclear weapons," and not to "possess nuclear reprocessing and uranium enrichment facilities." However, both sides failed to implement the agreement's provisions relating to a bilateral inspection regime. Although North Korea has violated the Joint Declaration, particularly in light of its threenuclear weapons tests (in 2006, 2009, and 2013), South Korea has never officially renounced its obligations under the declaration and has called on the North to abide by the agreement. Seoul has been a participant in the Six-Party Talks, aimed at ending the nuclear crisis on the Korean Peninsula, since their inception in 2003.

South Korea has a total of 23 nuclear power reactors in operation—ranking fifth in the world in number of reactors. As of 2013, nuclear energy provides approximately one third of its total electricity. [8] Korea plans to complete 11 new nuclear power plants by 2024. The South Korean government previously planned for 41 percent of the nation’s energy supplies to come from nuclear power by 2030, but policies released in January 2014 revised that number to 29 percent of total power supply by 2035. [9] A joint research project by the Korea Atomic Energy Research Institute (KAERI) and National Fusion Research Institute (NFRI) is currently underway to develop the 4th generation of nuclear power plants (Gen IV) which will incorporate Sodium-cooled Fast Reactor (SFR) and Very High Temperature gas-cooled Reactor (VHTR). The goal is to commercialize these technologies by 2030. [10] In January 2010, the Ministry of Knowledge Economy announced that it plans to export 80 nuclear power reactors by 2030 which is worth $400 billion. Thus far, South Korea has agreed to a US$20 billion contract to construct four reactors in the United Arab Emirates, and a $173 million contract to construct a nuclear research reactor in Jordan. [11] South Korea’s nuclear industry has also shown keen interest in penetrating into Chinese market which holds significance since China has been known to transfer its nuclear technologies and equipment to Pakistan, which is not a member of the NPT. [12] South Korean nuclear reactors have also faced safety and security issues with forged safety certificates for replacement parts. [13]   

Despite South Korea's extensive nuclear energy infrastructure and technological base, South Korea does not possess any independent means of enrichment or reprocessing. While its legal validity remains ambiguous, South Korea is politically constrained by the 1992 Joint Declaration with North Korea and the 1973 bilateral pact with the U.S. on nuclear cooperation. However, South Korean officials have expressed a keen interest in establishing a closed nuclear fuel cycle toward its goal of overtaking 20 percent of the global nuclear reactor market. [14] Additionally, South Korea’s own reliance on nuclear power is projected to grow, and the problem of mounting spent nuclear fuel is a pressing one. [15] As a country that has one of the highest population density in the world, South Korea’s problem of spent nuclear fuel storage stem from both securing the physical space and the strong domestic opposition from the Koreans who do not want the interim storage site in their neighborhood. Despite objections, low and intermediate-level waste (LILW) is stored at each reactor site with a total of about 60,000 drums of 200 liters. [16] A central disposal facility for low to medium level waste at Gyeongju was completed in June 2014; it is under a six month freeze until operators receive final approval from the new South Korean nuclear regulatory authority.A recent report from an independent advisory body indicates that South Korea will begin to run out of interim storage space for waste materials beginning in 2016. [17]

Concerns about South Korea's interest in a form of nuclear fuel recycling called pyroprocessing, and in uranium enrichment technology have hampered the renewal of the U.S.-South Korea nuclear cooperation agreement. The agreement, originally set to expire in 2014, was extended until 2016 to allow Washington and Seoul to come to some agreement about South Korea's interest in enrichment and reprocessing technology. [18] South Korean officials argue that pyroprocessing should not be considered a nonproliferation risk in the way traditional reprocessing is often viewed. However, U.S. government officials and many nonproliferation experts argue that proliferation concerns remain for pyroprocessing, which is still in the developmental stage, and that no safeguards currently exist for this method of reprocessing to assure materials are not being diverted for nuclear weapons purposes. [19] The latest round of talks on a renewal agreement between the two sides occurred in September 2014. [20] 

[1] Ha Yeong-seon, 한반도의 핵무기와 세계질서 [Nuclear Weapons on the Korean Peninsula and World Order] (Seoul: Nanam, 1991).
[2] Daniel A. Pinkston, "South Korea's Nuclear Experiments," CNS Research Story, 9 November 2004, http://cns.miis.edu.
[3] Anthony Faiola and Dafna Linzer, "S. Korea Admits Extracting Plutonium," Washington Post, 10 September 2004, www.washingtonpost.com.
[4] Anthony Faiola and Dafna Linzer, "S. Korea Admits Extracting Plutonium," Washington Post, 10 September 2004, www.washingtonpost.com.
[5] Mohamed El-Baradei, "Introductory Statement to the Board of Governors," IAEA Website, 13 September 2004, www.iaea.org.
[6] "IAEA Confirms S. Korea's Nuclear Activity Peaceful," Yonhap, 3 June 2008, in www.lexisnexis.com.
[7] Roh Tae Woo, "President Roh Tae Woo's Declaration of Non-Nuclear Korean Peninsula Peace Initiatives," 8 November 1991, available at www.fas.org.
[8] International Atomic Energy Agency, “Korea, Republic of,” Power Reactor Information System Database, 11 June 2013, http://pris.iaea.org. "Nuclear Power in South Korea," World Nuclear Association, August 2013, http://world-nuclear.org.
[9] “South Korea Cuts Future Reliance on Nuclear Power, but New Plants Likely,” Reuters, 13 January 2014, www.reuters.com.
[10] “차세대 원자로 개발 [Developing Nuclear Reactors for Future],” Korea Atomic Energy Research Institute, June 2012, www.kaeri.re.kr.
[11] "Korean Consortium for Jordan's First Reactor," World Nuclear News, 7 December 2009, www.world-nuclear-news.org; "UAE Picks Korea as Nuclear Partner," World Nuclear News, 29 December 2009, www.world-nuclear-news.org.
[12] Fred McGoldrick, “Nuclear Nonproliferation,” in  The US-South Korea Alliance: Meeting New Security Challenges, ed. Scott Snyder (Boulder, CO: Lynne Rienner Publishers, Inc., 2012).
[13] Meeyoung Cho, “South Korea to Widen Safety Probe on Certificates for Nuclear Reactor Parts,” Reuters, 7 February 2014, www.reuters.com.
[14] Park Seong-won, Miles A. Pomper, and Lawrence Scheinman, “The Domestic and International Politics of Spent Nuclear Fuel in South Korea: Are We Approaching Meltdown?” Korea Economic Institute Academic Paper Series, March 2010, Volume 5, Number 3, p. 4.
[15] "Fuel Cycle Process Development Division," Korea Atomic Energy Research Institute, http://ehome.kaeri.re.kr.
[16] "Nuclear Power in South Korea," World Nuclear Association, August 2013, http://world-nuclear.org.
[17] MeeYong Cho, "South Korea Running out of spent nuclear fuel storage space – advisory body," Reuters, 18 August 2014, http://uk.reuters.com.
[18] Hou Qiang, ed., "S. Korea, U.S. to Extend Nuclear Pact for Another 2 Years," Xinhua English News, 24 April 2013, http://news.xinhuanet.com; Mark E. Manyin, Mary Beth D. Nikitin, Emma Chanlett-Avery, William H. Cooper, Ian E. Rinehart, "U.S. – South Korean Relations," Congressional Research Service, 24 June 2014, www.crs.gov.
[19] Kim Kyung-tae, "핵연료 재처리 가능할까? [Will South Korea be Allowed to Reprocess Spent Nuclear Fuel?]" Hwan-kyung Ilbo, 25 November 2011, www.hkbs.co.kr; "S. Korea, US Resume Talks on Nuclear Energy," Agence France-Presse, 5 December 2011; Grace Oh, "S. Korea, US resume talks on key nuke energy pact," Yonhap, 7 January 2014, http://english.yonhapnews.co.kr.
[20] "Korea, U.S. to hold talks on nuke energy," The Korea Herald, 17 September 2014, www.koreaherald.com.

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This material is produced independently for NTI by the James Martin Center for Nonproliferation Studies at the Monterey Institute of International Studies and does not necessarily reflect the opinions of and has not been independently verified by NTI or its directors, officers, employees, or agents.

Get the Facts on South Korea

  • Operates 23 nuclear power reactors which provide 35% of its electricity
  • Completed destruction of its chemical weapons stockpile in July 2008
  • Owns a well-developed biotechnology infrastructure, but no evidence suggests the pursuit of a biological weapons program