Kori Nuclear Power Plant

The Kori Nuclear Power Plant (Korean: 고리원자력발전소, Hanja: 古里原子力發電所) is a South Korean nuclear power plant located in Kori, a suburban village in Busan. It is owned and operated by Korea Hydro & Nuclear Power, a subsidiary of KEPCO. The first reactor began commercial operation in 1978 and operated until 2017 when it was decommissioned. Units 2, 3, and 4 started commercial operations in the 1980s, and are all slated to be decommissioned in the mid-2020's. All reactors on site are pressurized water reactors.

Kori Nuclear Power Plant
Kori Nuclear Power Plant (8505820845).jpg
Kori Nuclear Power Plant, Reactors Kori 1, Kori 2, Kori 3, Kori 4 from right to left.
Official name고리원자력발전소
CountrySouth Korea
LocationGori, Busan
Coordinates35°19′12″N 129°17′24″E / 35.319904°N 129.290053°E / 35.319904; 129.290053Coordinates: 35°19′12″N 129°17′24″E / 35.319904°N 129.290053°E / 35.319904; 129.290053
Construction beganUnit 1: August 1, 1972
Unit 2: December 23, 1977
Unit 3: October 1, 1979
Unit 4: April 1, 1980
Unit 5: June 16, 2006
Unit 6: June 5, 2007
Unit 7: October 16, 2008
Unit 8: August 19, 2009
Commission dateUnit 1: April 29, 1978
Unit 2: July 25, 1983
Unit 3: September 30, 1985
Unit 4: April 29, 1986
Unit 5: February 28, 2011
Unit 6: July 20, 2012
Unit 7: December 20, 2016
Decommission dateUnit 1: June 18, 2017
Owner(s)Korea Hydro & Nuclear Power
Operator(s)Korea Hydro & Nuclear Power
Nuclear power station
Reactor typePWR
Reactor supplierWestinghouse
Cooling sourceSea of Japan
(East sea of Korea)
Thermal capacity1 × 1882 MWth
2 × 2912 MWth
2 × 2825 MWth
2 × 3983 MWth
Power generation
Units operational1 × 640 MW
1 × 1011 MW
1 × 1012 MW
2 × 997 MW
2 × 1340 MW
Make and model3 × WH-F
2 × OPR-1000
2 × APR-1400
Units under const.2 × 1340 MW APR-1400
Units decommissioned1 × 576 MW WH-60
Nameplate capacity7337 MW (netto)
Capacity factor74.45%
(includes Units 1 & 7)
Annual net output43,148 GW·h (2016)
(includes Units 1 & 7)
External links
CommonsRelated media on Commons


An expansion of the plant begun in 2006 added four new Korean-sourced reactors, the so-called Shin Kori reactors. The first pair of Shin Kori reactors are of the OPR-1000 design, while the second two are the APR-1400 design. Shin Kori 1 & 2 achieved commercial operations in 2011 and 2012 respectively, with Shin Kori 3 & 4 achieving commercial operations in 2016 and 2019. Construction on two further APR-1400 reactors, known as Shin Kori-5 and Shin Kori-6, was started in April 2017 and September 2018, respectively.[1][2]

In November 2019, the reactor pressure vessel of the 1340MWe APR-1400 reactor to be housed in Shin Kori 5 was installed.[3] As of November 2019, construction on the Shin Kori 5 and 6 was 51 percent complete.[3]

Kori Nuclear Power Plant became the largest operating nuclear power plant in the world by nameplate capacity after the commissioning of Shin Kori 4. Only the Kashiwazaki-Kariwa Nuclear Power Plant has a larger nameplate capacity, though it was idled after the 2011 Fukushima Daiichi nuclear disaster and has not been restarted as of 2019.

Name Capacity
Design First criticality Commercial start Decommissioning NSSS Turbine generator A-E Construction
Phase I
Kori-1 576 MW WH-60 06/1977 04/1978 06/2017 Westinghouse GEC Turbines (Rugby) Gilbert Westinghouse
Kori-2 640 MW WH-F 04/1983 07/1983 Westinghouse GEC Turbines (Rugby) Gilbert Westinghouse
Kori-3 1011 MW WH-F 01/1985 09/1985 Westinghouse GEC Turbines (Rugby) Bechtel Hyundai
Kori-4 1012 MW WH-F 10/1985 04/1986 Westinghouse GEC Turbines (Rugby) Bechtel Hyundai
Phase II
Shin Kori-1 996 MW OPR-1000 06/2010 02/2011 KHNP/KEPCO Doosan KOPEC Hyundai
Shin Kori-2 996 MW OPR-1000 12/2011 07/2012 KHNP/KEPCO Doosan KOPEC Hyundai
Shin Kori-3 1416 MW[4] APR-1400 12/2015 12/2016[5] KHNP/KEPCO Doosan KOPEC Hyundai
Shin Kori-4 1340 MW APR-1400 04/2019[6] 08/2019[7] KHNP/KEPCO Doosan KOPEC Hyundai
Shin Kori-5 1340 MW APR-1400 2022[6] Unknown Unknown Unknown Unknown
Shin Kori-6 1340 MW APR-1400 2023[6] Unknown Unknown Unknown Unknown

Kori-1 was shutdown in June 2017 in advance of decommissioning beginning in 2022 after its spent nuclear fuel is removed.[8]


On February 9, 2012, during a refueling outage, loss of off-site power (LOOP) occurred and emergency diesel generator (EDG) 'B' failed to start while EDG 'A' was out of service for scheduled maintenance, resulting in a station blackout (SBO). Off-site power was restored 12 minutes after the SBO condition began.

The LOOP was caused by a human error during a protective relay test of the main generator. The EDG 'B' failing to start was caused by the failure of the EDG air start system. Further investigation revealed that the utility did not exercise proper control of electrical distribution configuration to ensure the availability of the Station Auxiliary Transformer (SAT) while conducting test on the Unit Auxiliary Transformer (UAT).

After restoring off-site power through the SAT, the operators eventually recovered shutdown cooling by restoring power to a residual heat removal pump. During the loss of shutdown cooling for 19 minutes, the reactor coolant maximum temperature in the hot leg increased from 37℃ to 58.3℃ (approximately 21.3℃ rise), and the spent fuel pool temperature slightly increased from 21℃ to 21.5℃. There was no adverse effect on the plant safety as a result of this event, no radiation exposure to the workers, and no release of radioactive materials to the environment. However, inconsistent with the requirements, the licensee did not report the SBO event to the regulatory body in a timely manner and did not declare the "alert" status of the event in accordance with the plant emergency plan. The licensee reported this event to the regulatory body about a month after the event had occurred.[9]

On 2 October 2012 at 8:10 a.m., Shingori 1 was shut down after a warning signal indicated a malfunction in the control rod system. An investigation is currently[needs update] underway to verify the exact cause of the problem.[10]

In June 2013, Kori-2 was shutdown, and Kori-1 ordered to remain offline, until safety-related control cabling with forged safety certificates is replaced.[11] Control cabling installed in the APR-1400s under construction failed flame and other tests, so need to be replaced delaying construction by up to a year.[12]

In October 2013, cable installed in Shin Kori-3 failed safety tests, including flame tests. Replacement with U.S. manufactured cable delayed the startup of the plant,[12][13] which eventually entered commercial operation 3 years late.[5]


In the 2016 movie Pandora, the Kori Nuclear Power Plant is a main scene in the movie. The movie touches on the dangers of nuclear energy around the world and if it were to go wrong in a major city. This story also has some resemblance to the 2011 meltdown at the Fukushima Daiichi Nuclear Power Plant, which was caused by a tsunami. This movie features a 7.9 magnitude earthquake while the earthquake that impacted Fukushima was rated 9.1.[14][15][16]

See alsoEdit


  1. ^ "Archived copy". Archived from the original on 23 September 2018. Retrieved 17 October 2018.CS1 maint: archived copy as title (link)
  2. ^ "Archived copy". Archived from the original on 18 October 2018. Retrieved 17 October 2018.CS1 maint: archived copy as title (link)
  3. ^ a b "Reactor vessel installed at Shin Kori 5 - Nuclear Engineering International". www.neimagazine.com. Retrieved 3 December 2019.
  4. ^ "Archived copy". Archived from the original on 22 September 2018. Retrieved 27 April 2019.CS1 maint: archived copy as title (link)
  5. ^ a b "First Korean APR-1400 enters commercial operation". World Nuclear News. 20 December 2016. Archived from the original on 24 August 2017. Retrieved 23 December 2016.
  6. ^ a b c "Archived copy". Archived from the original on 28 April 2019. Retrieved 27 April 2019.CS1 maint: archived copy as title (link)
  7. ^ "Second-APR-1400-unit-starts-commercial-operation". Retrieved 3 September 2019.
  8. ^ "Korea to decommission its oldest reactor". Nuclear Engineering International. 12 June 2017. Archived from the original on 25 July 2017. Retrieved 21 July 2017.
  9. ^ "Loss of shutdown cooling due to station blackout during refueling outage". IAEA. 23 April 2012. Archived from the original on 23 June 2012. Retrieved 6 November 2012.
  10. ^ Yonhap News (2 October 2012) Nuclear reactor halts operation due to malfunction Archived 4 October 2012 at the Wayback Machine
  11. ^ "New component issues idle Korean reactors". World Nuclear News. 28 May 2013. Retrieved 7 June 2013.
  12. ^ a b "Recabling delays Shin Kori start ups". World Nuclear News. 18 October 2013. Archived from the original on 30 October 2013. Retrieved 15 November 2013.
  13. ^ "Shin-Kori 3 receives replacement cables". Nuclear Engineering International. 30 September 2014. Archived from the original on 2 April 2015. Retrieved 10 March 2015.
  14. ^ Lee, Maggie (10 December 2016). "Film Review: 'Pandora'". Variety. Archived from the original on 23 January 2019. Retrieved 23 January 2019.
  15. ^ "With Kori-1 shutdown, Pres. Moon signals major turn away from nuclear energy". Hankyoreh. 20 June 2017. Archived from the original on 23 January 2019. Retrieved 23 January 2019.
  16. ^ Park, Jin-hai (4 December 2016). "Disaster movie 'Pandora' rings true more than ever". Korea Times. Archived from the original on 23 January 2019. Retrieved 23 January 2019.

External linksEdit