Wolseong Nuclear Power Plant (Korean: 월성원자력발전소 ), also known as Wolsong Nuclear Power Plant. It is located in the east of South Korea near the Sea of Japan. It is built at Nae-ri, Yangnm-myeon, Gyeongju, North Gyeongsang province.
Wolseong Nuclear Power Plant will be constructed in two phases, with a total of 6 reactors and an installed capacity of 3,835 MW.
Construction of Wolseong 1 started in 1976 and was completed in 1982. In the following year, the power plant began commercial operations. This PHWR reactor has a gross generation capacity of 678 MW.

Wolseong reactors 2, 3 and 4 were completed in 1997, 1998 and 1999, respectively. Each of these reactors has a capacity of 700 MW. Wolseong Nuclear Plant has since operated successfully.
Wolseong Nuclear Power Plant supplies about 5% of South Korea’s electricity. It is the only South Korean nuclear power plant operating CANDU-type PHWR (Pressurized Heavy Water Reactors).
Korea Hydro & Nuclear Power owns the plant. These reactors are capable of consuming multiple types of fuel, including wastes from South Korea’s other nuclear plants.

Shin-Wolsong Nuclear Power Plant
Shin-Wolsong No. 1 and No. 2, are two new OPR-1000 type pressurized water reactors. Shin-Wolsong 1 became fully operational in July 2012.
In November 2014, Shin Wolsong-2 loaded its first core of nuclear fuel, and the plant was connected to the grid in February 2015, with commercial operation commencing in July 2015.

6 Reactors
Construction began
Phase I
- Wolsong-1 October 30, 1977
- Wolsong-2 June 22, 1992
- Wolsong-3 March 17, 1994
- Wolsong-4 July 22, 1994
Phase II
- Shin Wolsong-1 November 20, 2007
- Shin Wolsong-2 September 23, 2008
Commission date
Phase I
- Wolsong-1 April 22, 1983
- Wolsong-2 July 1, 1997
- Wolsong-3 July 1, 1998
- Wolsong-4 October 1, 1999
Phase II
- Shin Wolsong-1 July 31, 2012
- Shin Wolsong-2 July 24, 2015
Unit 1 of the Wolsong nuclear power plant ( Wolsong-1 ) will be decommissioned before the expiration of the operating permit in 2022.

Wolseong Nuclear Power Plant Data
- Country
- South Korea
- Region
- East Asia
- Status
- In use
- Official name
- 월성원자력발전소, 月城原子力發電所
- Location
- Gyeongju, North Gyeongsang, South Korea
- Owner
- Korea Hydro & Nuclear Power
- Operator
- Korea Hydro & Nuclear Power
- Began
- Oct-30, 1977
- Opened
- Apr-22, 1983
- Installed capacity
- 3835 MW
- Units operational
- 1 × 657 MW 1 × 647 MW 1 × 651 MW 1 × 653 MW 1 × 997 MW 1 × 993 MW
- Reactor type
- CANDU, PHWR, PWR
- Reactor supplier
- AECL KEPCO E&C
- Cooling source
- Sea of Japan (East sea of Korea)
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