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, Reactors Kori 1, Kori 2, Kori 3, Kori 4 from right to left.
|Construction began||Unit 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 date||Unit 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 date||Unit 1: June 18, 2017|
|Owner(s)||Korea Hydro & Nuclear Power|
|Operator(s)||Korea Hydro & Nuclear Power|
|Nuclear power station|
|Cooling source||Sea of Japan|
(East sea of Korea)
|Thermal capacity||1 × 1882 MWth|
2 × 2912 MWth
2 × 2825 MWth
2 × 3983 MWth
|Units operational||1 × 640 MW|
1 × 1011 MW
1 × 1012 MW
2 × 997 MW
2 × 1340 MW
|Make and model||3 × WH-F|
2 × OPR-1000
2 × APR-1400
|Units under const.||2 × 1340 MW APR-1400|
|Units decommissioned||1 × 576 MW WH-60|
|Nameplate capacity||7337 MW (netto)|
(includes Units 1 & 7)
|Annual net output||43,148 GW·h (2016)|
(includes Units 1 & 7)
|Commons||Related 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.
In November 2019, the reactor pressure vessel of the 1340MWe APR-1400 reactor to be housed in Shin Kori 5 was installed. As of November 2019, construction on the Shin Kori 5 and 6 was 51 percent complete.
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.
|Design||First criticality||Commercial start||Decommissioning||NSSS||Turbine generator||A-E||Construction|
|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|
|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||APR-1400||12/2015||12/2016||KHNP/KEPCO||Doosan||KOPEC||Hyundai|
|Shin Kori-4||1340 MW||APR-1400||04/2019||08/2019||KHNP/KEPCO||Doosan||KOPEC||Hyundai|
|Shin Kori-5||1340 MW||APR-1400||2022||Unknown||Unknown||Unknown||Unknown|
|Shin Kori-6||1340 MW||APR-1400||2023||Unknown||Unknown||Unknown||Unknown|
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.
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.
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. 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.
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, which eventually entered commercial operation 3 years late.
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.
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- "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.
- 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.