WNP-1 and WNP-4

WNP-1/4
WNP-1/4 site in 2009, with WNP-1 to the south and WNP-4 to the north. The turbine building extends northeast of the containment, and the auxiliary building extends south of the containment.
Location of WNP-1/4 in Washington (state)
Official name	Nuclear Project Nos. 1 and 4
Country	United States
Location	North of Richland, Benton County, Washington
Coordinates	46°28′17″N 119°19′01″W / 46.4715°N 119.3170°W / 46.4715; -119.3170Coordinates: 46°28′17″N 119°19′01″W / 46.4715°N 119.3170°W / 46.4715; -119.3170
Status	canceled
Construction began	1975
Commission date	N/A
Owner(s)	Washington Public Power Supply System
Nuclear power station
Reactor type	PWR
Reactor supplier	Babcock & Wilcox
Power generation
Units planned	2 × 1267 MW
Nameplate capacity	2534 MW

Washington Nuclear Project Nos. 1 and 4, abbreviated as WNP-1 and WNP-4 were two of the five nuclear power plants on which construction was started by the Washington Public Power Supply System (WPPSS) in order to meet projected electricity demand in the Pacific Northwest. WNP-1, WNP-2 and WNP-3 were part of the original 1968 plan, with WNP-4 (a twin to WNP-1 and located at the same site) and WNP-5 (a twin to WNP-3, in similar fashion) added in the early 1970s.

WNP-1 and -4 are located on 972 acres (393 ha), within the boundaries of the Hanford Reservation in the U.S. state of Washington, approximately 1.5 miles (2.4 km) east of the Columbia Generating Station. The WNP-1 site has been proposed as a potential pilot location for small modular reactors.

The Site Certification Agreement was approved in 1975, with construction commencing on both units later that year. Labor disputes at Hanford halted construction on WNP-1, -2 and -4 in 1980 and the forecast electric demand had failed to materialize, prompting WPPSS to install new management and re-evaluate the cost and schedule for all five nuclear projects. In 1982, the Bonneville Power Administration, which had encouraged and was responsible for funding the construction of the initial three projects, had to decide between shutting down construction on WNP-1 or WNP-3. Construction continued on WNP-3 since WNP-3 was partly owned by public utilities and was slightly ahead of schedule, and WNP-1 entered an extended construction delay in April 1982 when it was approximately 63% complete.

Equipment and structures at WNP-1 were preserved to enable the resumption of construction at a later date, based on regional energy forecasts showing surplus power generation would disappear by 1990, but preservation was terminated in 1995. However, the low humidity has maintained the structures in a reasonable condition. The co-owners of WNP-4 and WNP-5 planned to fund similar preservation measures for a potential construction restart, but could not agree on funding obligations, and WNP-4 was canceled in January 1982 at approximately 24% complete.