| More Hall Annex | |
|---|---|
 The decommissioned More Hall Annex, photographed in 2009 | |
 | |
| Former names | Nuclear Reactor Building (1961–2001) |
| General information | |
| Type | Nuclear research reactor |
| Architectural style | Brutalist |
| Address | 3785 Jefferson Road NE Seattle, Washington |
| Opened | April 10, 1961 |
| Inaugurated | June 1, 1961 |
| Closed | June 30, 1988 |
| Demolished | July 19, 2016 |
| Owner | University of Washington |
| Dimensions | |
| Other dimensions | 69 ft 8 in by 76 ft (21.23 m by 23 m) |
| Technical details | |
| Material | Reinforced concrete |
| Size | 7,595 sq ft (705.6 m2) |
| Floor count | 2 |
| Design and construction | |
| Architecture firm | The Architect Artist Group |
| Designations | NRHP, WSHR |
Nuclear Reactor Building | |
  | |
| Location | Seattle, Washington |
| Coordinates | 47°39′10″N 122°18′16″W / 47.65278°N 122.30444°W |
| Built | 1961 |
| Architectural style | Brutalist |
| NRHP reference No. | 08001158 |
| Added to NRHP | July 24, 2009 |
| References | |
| [1][2] | |
| Nuclear Reactor Building | |
|---|---|
| Operating Institution | University of Washington |
| Location | Seattle, Washington |
| Type | Argonaut class reactor |
| Power | 100 kW (thermal) |
| First Criticality | 1961 |
| Shutdown date | 1988 |
| Decommission date | 2007 |
| Technical Specifications | |
| Fuel Type | Uranium-235 |
The More Hall Annex, formerly the Nuclear Reactor Building, was a building on the campus of the University of Washington (UW) in Seattle, Washington, United States, that once housed a functional nuclear research reactor. It was inaugurated in 1961 and shut down in 1988, operating at a peak of 100 kilowatts thermal (kWt), and was officially decommissioned in 2007.
The reactor was housed in a reinforced concrete building designed in the Brutalist architectural style by UW faculty members. They designed the reactor room with large windows that allowed observation from the outside, in an attempt to demonstrate the safety of nuclear energy.
The Nuclear Reactor Building was added to the National Register of Historic Places in 2009, after a campaign led by an architecture student in response to the proposed demolition of the building. A later demolition plan prompted a lawsuit from preservation groups, which ended with a court ruling exempting the building from the city's landmarks-preservation ordinance. While this decision was eventually overturned, the university demolished the building in July 2016 and replaced it with a new computer science building that opened in February 2019.
- ^ The Johnson Partnership (August 2008). More Hall Annex: Historic Resources Addendum (PDF) (Report). University of Washington. Archived (PDF) from the original on March 1, 2017. Retrieved November 29, 2016.
- ^ Martin, Abby (June 10, 2009). National Register of Historic Places Registration: Nuclear Reactor Building (More Hall Annex) (Report). National Park Service. Retrieved November 29, 2016, with 12 photos from 2007–08