The Wolseong Nuclear Power Plant, or Wolsong, is a nuclear power plant located on the coast near Nae-ri, Yangnam-myeon, Gyeongju, North Gyeongsang province, South Korea. 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.

The power plant site including Yangnam-myeon. Yangbuk-myeon and Gampo-eup was designated an industrial infrastructure development zone in 1976. 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.

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 June 2013 Shin-Wolsong 1 was shut down, and Shin-Wolsong 2 ordered to remain offline, until safety-related control cabling with forged safety certificates is replaced. Shin Wolsong-1 was approved for restart in January 2014. 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.

Unit	Type	Capacity (net)	Construction start	Operation start	Notes
Phase I
Wolsong-1	CANDU-6	657 MW	30 Oct 1977	22 April 1983	Unit placed in Permanent Shutdown in 2019.
Wolsong-2	CANDU-6	576 MW	22 June 1992	1 July 1997
Wolsong-3	CANDU-6	601 MW	17 March 1994	1 July 1998
Wolsong-4	CANDU-6	567 MW	22 July 1994	1 Oct 1999
Phase II
Shin Wolsong-1	OPR-1000	997 MW	20 Nov 2007	31 July 2012
Shin Wolsong-2	OPR-1000	993 MW	23 Sept 2008	24 July 2015

• Kori Nuclear Power Plant
• Nuclear power in South Korea
• List of nuclear reactors#South Korea

• Nuclear power > Wolseong Archived 2010-02-01 at the Wayback Machine at Korea Nuclear Energy Foundation