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Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
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|Cooper Nuclear Station|
The reactor complex on June 15, 2011 during the 2011 Missouri River Floods
|Location||Nemaha County, near Brownville, Nebraska|
|Commission date||July 1, 1974|
|Licence expiration||January 18, 2034|
|Owner(s)||Nebraska Public Power District (NPPD)|
|Architect(s)||Burns & Roe|
|Reactors operational||1 × 770 MW|
|Reactor type(s)||boiling water reactor|
|Reactor supplier(s)||General Electric|
|Power generation information|
|Capacity factor||88.4% (2008)|
|Net generation||5,964 GW·h|
|As of 2010-12-01|
Cooper Nuclear Station (CNS) is a boiling water reactor (BWR) type nuclear power plant located on a 1,251-acre (5.1 km²) site near Brownville, Nebraska between Missouri River mile markers 532.9 and 532.5. It is the largest single-unit electrical generator in Nebraska.
CNS is owned and operated by the Nebraska Public Power District (NPPD), a political subdivision of the state of Nebraska. Management support services for Cooper Nuclear Station is provided by Entergy Nuclear, the nation's second largest nuclear power operator.
The facility is named after Humboldt natives Guy Cooper, Jr., and Guy Cooper, Sr. The senior Cooper's father, O. A. Cooper, built the first electrical plant in Humboldt in 1890; the two Guy Coopers served a total of 27 years on the board of NPPD and its predecessor agency, Consumers Public Power District.
CNS was first put into operation in July 1974 and generates approximately 800 megawatts (MWe) of electricity. The plant consists of a General Electric BWR/4 series reactor plant and a Westinghouse turbine generator. The plant has a Mark I containment system.
In 1998, CNS was the first plant in the United States to load nuclear fuel containing uranium that had been provided under the Megatons to Megawatts Program, in which uranium removed from nuclear weapons of the former Soviet Union was turned into low-enriched uranium and then into fuel.
In September 2008, NPPD applied to the U.S. Nuclear Regulatory Commission (NRC) for a renewal of the operating license for CNS, extending it for an additional twenty years. In November 2010 CNS received its license renewal, which was the 60th renewal license to be issued by the NRC.
An agreement was approved in January 2010 by NPPD to extend Entergy's management support services until January 2029. The original contract between the companies, signed in 2003, was for the remaining years of the plant's original operating license, which ran until January 18, 2014.
The Nuclear Regulatory Commission defines two emergency planning zones around nuclear power plants: a plume exposure pathway zone with a radius of 10 miles (16 km), concerned primarily with exposure to, and inhalation of, airborne radioactive contamination, and an ingestion pathway zone of about 50 miles (80 km), concerned primarily with ingestion of food and liquid contaminated by radioactivity. In 2010, the population within 10 miles of Cooper was 4,414; the population within 50 miles was 163,610. Cities within the 50-mile radius include Nebraska City, with a population of 7,289, located 25 miles (40 km) from the plant.
The Nuclear Regulatory Commission's estimate of the risk each year of an earthquake intense enough to cause core damage to the reactor at CNS was 1 in 142,857, according to an NRC study published in August 2010.
At 0402 CDT on 6/19/2011 a Notification of Unusual Event was declared due to the elevation of the Missouri River reaching 899.1 feet above mean sea level. This is above the Emergency Action Level HU1.5 elevation of 899 feet. Later, the Missouri River reached 900.6 feet on 6/23/2011 while elevation of 902 feet is the alert level for the plant.  The plant left the emergency status at 9:47 a.m., July 12 after the river dropped to 895.8 feet—3 feet below the emergency status level.
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