Top 10 nuclear power factsTechnology quiz
What is the only physical difference between heavy water and pure water?
Heavy water has greater density. Heavy water contains deuterium instead of common hydrogen-1. In its pure form it has a density about 11% greater than water, but otherwise, it is physically and chemically similar. It is not radioactive. Because of greater density and stronger hydrogen-oxygen bonds, its behaviour is slightly different in some biochemical reactions. It may be toxic, but only when a large fraction of water (> 50%) in higher organisms is replaced by heavy water.
The USS Enterprise is a ship with the largest number of nuclear reactors. How many does she have?
8. Most American aircraft carriers are powered by two reactors. The only exception was the early-constructed USS Enterprise, having an eight-reactor propulsion design, with each A2W reactor taking the place of one of the conventional boilers in earlier constructions. Enterprise was meant to be the first of a class of six, but construction costs ballooned and the remaining vessels were never laid down. The design was replaced by two-reactor Nimitz class.
What is the only continent (except Antarctic) without nuclear power plants?
Australia is practically the only developed country not using electricity (indigenous or imported) from nuclear energy. Australia's abundance of cheap coal, conveniently located to population centers, has ruled nuclear energy out of contention on economic grounds. There are nuclear power plants on all other continents, including South America (Brazil, Argentina) and Africa (South Africa).
What makes depleted uranium a good material for making ammunition?
High density. Depleted uranium is 1.67 times as dense as lead, 84% as dense as osmium or iridium, which are the densest known substances under standard (i.e., Earth-surface) pressures. Consequently a depleted uranium projectile of given mass has a smaller diameter than an equivalent lead projectile, with less aerodynamic drag and deeper (armor-piercing) penetration due to a higher pressure at point of impact.
Apart from power plants, who is the main user of nuclear reactors worldwide?
The army. By 1990 there were more nuclear reactors powering ships (mostly military) than there were generating electric power in commercial power plants worldwide (however, marine reactors are much smaller). Many of these submarines and other vessels were decommissioned in the 1990s.
United States is the global leader in nuclear power production. Which country takes the second place?
France. The present situation is due to the French government deciding in 1974, just after the first oil shock, to expand rapidly the country's nuclear power capacity. This decision was taken in the context of France having substantial heavy engineering expertise but few indigenous energy resources.
What was the world's first grid-connected nuclear power plant?
Obninsk Nuclear Power Plant was built in the "Science City" of Obninsk, Kaluga Oblast, about 110 km southwest of Moscow. It remained in operation between 1954 and 2002, although its production of electricity for the grid ceased in 1959; thereafter it functioned as a research and isotope production plant only.
What is the main reason to use nuclear reactor on a submarine?
It needs no oxygen. Nuclear reactor requires no oxygen for combustion and emits no exhaust gas. It gives the submarine the ability to operate submerged at high speeds, for unlimited periods, dependent only on the endurance of its crew. Nuclear power revolutionized the submarine, finally making it a true "underwater" vessel, rather than a "submersible" craft.
Which of the G8 countries is the smallest emitter of carbon dioxide?
France. Low carbon dioxide emission in France is a result of large investments in nuclear technology. Most electricity produced by France is generated by 59 nuclear power plants. As a side-effect renewable energies are having difficulty taking off.
Which of these lakes is considered the most toxic in the world?
Lake Karachay is a small lake in central Russia. It is often referred to as the most polluted site on earth. Containing just one square mile of water, the lake formed a dumping ground for nuclear waste by for around 12 years.High level radioactive waste makes up almost the entire lake-bed to a depth of around 3.4 meters. Some areas surrounding the lake have radiation measurements of around 6 Sv/hour, which is enough to give a lethal dose to a human in as little as 30 minutes¹.