Halden Boiling Water Reactor (HBWR)
The reactor is situated 100 meters within a rock hillside, with a rock covering of 30-50 meters. As the reactor is operational the reactor hall is closed with air lockdoors. The net volume inside the reactor hall is 4500 m³. The reactor hall is 10 meters wide, 30 meters long and has a total height of 26 meters, where 11.5 meters are above the main floor. The reactor hall also contains fuel pits for temporarily storage of used fuel.
The reactor is a natural circulation boiling heavy water reactor. The maximum power is 25 MW, with a maximum operational pressure of 33.6 bar. The energy produced is delivered to Norske Skog Saugbrugsforeningen as steam through heat exchangers and pipelines. Saugbrugsforeningen uses the steam in their paper production.
The reactor plant includes also water-filled fuel storage pits in the reactor hall and the bunker building. There are also positions with dry conditions in the bunker building. The storage rooms contain app. 6900 kg (0.36m³) radiated metallic uranium and ca. 2600 kg (0.29m³) radiated uranium oxide.
The reactor plant is supplied with water from Norske Skog Saugbrugsforeningen and/or Halden-water mains. Normally water is taken from Norske Skog as cooling water for heat exchangers and other process equipment, while Halden water is mainly used as drinking water and sanitary water. Halden-water is mainly used as a reserve for reactor plant water supplies.