Grand Gulf Nuclear Station is a

nuclear power station A nuclear power plant (NPP) is a thermal power station in which the heat source is a nuclear reactor. As is typical of thermal power stations, heat is used to generate steam that drives a steam turbine connected to a generator that produces ele ...

with one operational

GE BWR General Electric's BWR product line of boiling water reactors represents the designs of a relatively large (~18%) percentage of the commercial fission reactors around the world. The progenitor of the BWR line was the 5 MW Vallecitos Boiling Wat ...

reactor (

General Electric General Electric Company (GE) is an American multinational conglomerate founded in 1892, and incorporated in New York state and headquartered in Boston. The company operated in sectors including healthcare, aviation, power, renewable en ...

boiling water reactor A boiling water reactor (BWR) is a type of light water nuclear reactor used for the generation of electrical power. It is a design different from a Soviet graphite-moderated RBMK. It is the second most common type of electricity-generating nu ...

). It lies on a site near

Port Gibson, Mississippi Port Gibson is a city in Claiborne County, Mississippi, United States. The population was 1,567 at the 2010 census. Port Gibson is the county seat of Claiborne County, which is bordered on the west by the Mississippi River. It is the site of the ...

. The site is wooded and contains two lakes. The plant has a 520-foot natural draft

cooling tower A cooling tower is a device that rejects waste heat to the atmosphere through the cooling of a coolant stream, usually a water stream to a lower temperature. Cooling towers may either use the evaporation of water to remove process heat an ...

. As of January 2023, the plant employs 675 people. Grand Gulf's reactor is the most powerful in the US and the 7th most powerful in the world, with a core power of 4408 MW_th yielding a nominal gross electrical output of 1443 MW_e. Grand Gulf is operated by

Entergy Entergy Corporation is a Fortune 500 integrated energy company engaged primarily in electric power production and retail distribution operations in the Deep South of the United States. Entergy is headquartered in New Orleans, Louisiana, and gene ...

, which also owns 90% of the station through their subsidiary, System Energy Resources Inc. The other 10% is owned by Cooperative Energy.

Units 2 and 3

Adjacent to the operating Grand Gulf station, is an unfinished concrete structure that was to be the containment for Unit 2, a twin to the existing Unit 1. In December 1979, staggered by construction cost,

(then called Middle South Utilities) stopped work on Unit 2. On September 22, 2005, it was announced that Grand Gulf had been selected as the site for a GE ESBWR reactor. For details, see Nuclear Power 2010 Program. This was to be Unit 3. In 2007, the U.S. Nuclear Regulatory Commission (NRC) issued an Early Site Permit (ESP) to Grand Gulf. In 2008, Entergy and NuStart submitted a

Combined Construction and Operating License The Combined Construction and Operating License (Regulatory Guide 1.206, COL) replaced the previous Draft Regulatory Guide 1145 as the licensing process for new nuclear power plants in the United States. It is a part of a newer "streamlined" proce ...

(COL) application for a potential new nuclear unit at the Grand Gulf. On January 9, 2009, Entergy indefinitely postponed work towards the license and construction of Unit 3. In September 2015 the NRC withdrew the COL for the ESBWR unit, at the request of Entergy.

Electricity Production

Surrounding population

The Nuclear Regulatory Commission defines two emergency planning zones around nuclear power plants: a plume exposure pathway zone with a radius of , concerned primarily with exposure to, and inhalation of, airborne

radioactive contamination Radioactive contamination, also called radiological pollution, is the deposition of, or presence of radioactive substances on surfaces or within solids, liquids, or gases (including the human body), where their presence is unintended or undesirab ...

, and an ingestion pathway zone of about , concerned primarily with ingestion of food and liquid contaminated by radioactivity. The 2010 U.S. population within of Grand Gulf was 6,572, a decrease of 18.6 percent in a decade, according to an analysis of U.S. Census data for msnbc.com. The 2010 U.S. population within was 321,400, a decrease of 0.4 percent since 2000. Cities within 50 miles include Port Gibson (5 miles to city center), Vicksburg (25 miles). Alcorn State University is 25 miles southwest of the plant.

Seismic risk

The Nuclear Regulatory Commission's estimate of the risk each year of an earthquake intense enough to cause core damage to the reactor at Grand Gulf was 1 in 83,333, according to an NRC study published in August 2010.

Release of low levels of tritium into Mississippi River

After heavy rains in late April 2011, workers were pumping standing water collected in the abandoned, never-completed Unit 2 turbine building into the Mississippi River. Detectors sounded alarms at the presence of

tritium Tritium ( or , ) or hydrogen-3 (symbol T or H) is a rare and radioactive isotope of hydrogen with half-life about 12 years. The nucleus of tritium (t, sometimes called a ''triton'') contains one proton and two neutrons, whereas the nucleus of ...

in the water, and the pumping was stopped. The accidental release was reported to the Mississippi Health Department and the NRC. As of the dates of the news reports, it was unknown both how much tritium had entered the river and how the tritium had collected in the standing water, given that Unit 2 was not an operational reactor and had never been completed. It is unknown how much tritium entered the river because samples were not taken at the leak time. The NRC is investigating to find the source of the leak. Tritium is a very low level

beta emitter In nuclear physics, beta decay (β-decay) is a type of radioactive decay in which a beta particle (fast energetic electron or positron) is emitted from an atomic nucleus, transforming the original nuclide to an isobar of that nuclide. For exam ...

with an approximate half-life of 12.3 years and it cannot penetrate the outer dead layer of skin. The main concern with this isotope is inhalation or ingestion.

Notes

External links

* * * {{U.S. Nuclear Plants Energy infrastructure completed in 1985 Nuclear power plants in Mississippi Buildings and structures in Claiborne County, Mississippi Nuclear power stations using Economic Simplified Boiling Water Reactors Entergy 1985 establishments in Mississippi