Please answer the following question: Information: - Heavy water (deuterium oxide) is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (or D, also known as "heavy hydrogen"), rather than the common hydrogen-1 isotope (or H, also called protium) that makes up most of the hydrogen in normal water. The presence of deuterium gives the chemical different nuclear properties, and the increase of mass gives it different physical and chemical properties compared to normal "light water". - A county seat is an administrative center, seat of government, or capital city of a county or civil parish. The term is used in the United States, Canada, Romania, China and Taiwan. In the United Kingdom and Ireland, county towns have a similar function. - Parr Reservoir or Parr Shoals Reservoir is an impoundment of the Broad River in Pomaria, South Carolina. It is the last dam on the Broad River before the river reaches Columbia, South Carolina and the Columbia Canal. The lake is mainly used as a holding pond of sorts, as the water is pulled in and out and used to cool the turbines of a nearby nuclear power plant. Some anglers will fish for catfish in the main river channel, while bass fishing is mainly held back to Heller's and Cannon creeks, as well as the tailrace below Lake Monticello. Because of fluctuating water levels, and millions of submerged trees lurking underneath the shallow water, it is an extremely dangerous body of water to fish. - Fairfield County is a county located in the U.S. state of South Carolina. As of the 2010 census, its population was 23,956. Its county seat is Winnsboro. - The Virgil C. Summer Nuclear Generating Station occupies a site near Jenkinsville , South Carolina , in Fairfield County , South Carolina , approximately 20 miles ( 32 km ) northwest of Columbia . The nuclear power station includes the decommissioned experimental Carolinas - Virginia Tube Reactor ( CVTR ) unit , just outside the site of the old town of Parr , SC . The CVTR was a 17 MWe , heavy water reactor . Its cooling water is supplied by the Monticello Reservoir ( not to be confused with the Monticello Nuclear Generating Station in Minnesota ) , which is also used by a pumped storage ( hydroelectric ) unit . The plant utilizes a once - through cooling system . This plant has one Westinghouse 3 - loop Pressurized Water Reactor , which has received approval of a 20 - year license extension , taking the license expiration of Unit 1 from 2022 to 2042 . The plant is also in the process of constructing two Westinghouse AP1000 plants , which are currently on schedule to go online in 2019 and 2020 , respectively . The plant is named after Virgil Clifton Summer , the former Chairman and CEO of SCE&G . - Jenkinsville is an incorporated town in western Fairfield County, South Carolina, United States, between the Broad and the Little rivers. It is located east of Monticello Reservoir and is near the Virgil C. Summer Nuclear Generating Station. Also in the area is the Kincaid-Anderson House and quarry. The town is South Carolina's newest, incorporating in 2008. Jenkinsville's population at the 2010 census was 46, making it South Carolina's smallest town. - Hydrogen is a chemical element with chemical symbolH and atomic number1. With an atomic weight of , hydrogen is the lightest element on the periodic table. Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass. Non-remnant stars are mainly composed of hydrogen in the plasma state. The most common isotope of hydrogen, termed "protium" (name rarely used, symbol H), has one proton and no neutrons. - South Carolina is a state in the southeastern region of the United States. The state is bordered to the north by North Carolina, to the south and west by Georgia across the Savannah River, and to the east by the Atlantic Ocean. - Deuterium (symbol ' or ', also known as heavy hydrogen) is one of two stable isotopes of hydrogen. The nucleus of deuterium, called a deuteron, contains one proton and one neutron, whereas the far more common hydrogen isotope, protium, has no neutron in the nucleus. Deuterium has a natural abundance in Earth's oceans of about one atom in of hydrogen. Thus deuterium accounts for approximately 0.0156% (or on a mass basis 0.0312%) of all the naturally occurring hydrogen in the oceans, while the most common isotope (hydrogen-1 or protium) accounts for more than 99.98%. The abundance of deuterium changes slightly from one kind of natural water to another (see Vienna Standard Mean Ocean Water). - Monticello is a reservoir in the U.S. state of South Carolina, built to provide water for the Virgil C. Summer Nuclear Generating Station. It is located in Jenkinsville. While it does not dam any major rivers, its outflow flows directly into Parr Reservoir, an artificial lake created along the Broad River, via the Fairfield Pumped Storage power station. - A reservoir (etymology: from French "reservoir" a "storehouse" ) is a storage space for fluids. These fluids may be water, hydrocarbons or gas. A reservoir usually means an enlarged natural or artificial lake, storage pond or impoundment created using a dam or lock to store water. Reservoirs can be created by controlling a stream that drains an existing body of water. They can also be constructed in river valleys using a dam. Alternately, a reservoir can be built by excavating flat ground and/or constructing retaining walls and levees. - A U.S. state is a constituent political entity of the United States of America. There are 50 states, which are bound together in a union with each other. Each state holds administrative jurisdiction over a defined geographic territory, and shares its sovereignty with the United States federal government. Due to the shared sovereignty between each state and the federal government, Americans are citizens of both the federal republic and of the state in which they reside. State citizenship and residency are flexible, and no government approval is required to move between states, except for persons covered by certain types of court orders (e.g., paroled convicts and children of divorced spouses who are sharing custody). - A census is the procedure of systematically acquiring and recording information about the members of a given population. It is a regularly occurring and official count of a particular population. The term is used mostly in connection with national population and housing censuses; other common censuses include agriculture, business, and traffic censuses. The United Nations defines the essential features of population and housing censuses as "individual enumeration, universality within a defined territory, simultaneity and defined periodicity", and recommends that population censuses be taken at least every 10 years. United Nations recommendations also cover census topics to be collected, official definitions, classifications and other useful information to co-ordinate international practice. - Rats are various medium-sized, long-tailed rodents of the superfamily Muroidea. "True rats" are members of the genus "Rattus", the most important of which to humans are the black rat, "Rattus rattus", and the brown rat, "Rattus norvegicus". Many members of other rodent genera and families are also referred to as rats, and share many characteristics with true rats. - Isotopes are variants of a particular chemical element which differ in neutron number. All isotopes of a given element have the same number of protons in each atom. The term isotope is formed from the Greek roots isos ( "equal") and topos ( "place"), meaning "the same place"; thus, the meaning behind the name is that different isotopes of a single element occupy the same position on the periodic table. Given the information, choose the subject and object entities that have the relation of 'instance of'.
A:
virgil c. summer nuclear generating station , nuclear power plant