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 the world's largest fully operational nuclear generating station by total reactor count and the number of currently operational reactors since 2016, after it exceeded in nameplate capacity Canada's Bruce Nuclear Generating Station. 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. All reactors on site are pressurized water reactors. Reactors An expansion of the plant begun in 2006 added four new Korean-sourced reactors, the so-called Shin Kori reactors (shin meaning "new"). 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 and 2 achieved commercial operations in 2011 and 2012 respectively, with Shin Kori 3 and 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 2021. Kori-1 was shutdown in June 2017 in advance of decommissioning beginning in 2022 after its spent nuclear fuel is removed. Decommissioning will take 15 years to complete and will cost an estimated KRW719.4 billion (US$639.5 million). Incidents Minor incidents On 9 February 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