Short answer: 2
More details: There have only been two full meltdowns, both in Ukraine (Prypait and Chernobyl). These were due to inadequate safety systems, as the USSR didn't exactly care about the safety of it's citizens. There have, however, been many partial meltdowns. These are usually due to one of the following:
• Simultaneous human and machine error (neither the machines nor the technicians noticed a problem).
• Massive human error (Human error so bad, the machines were incapacitated and couldn't detect the human error.
When adequate safety systems are in place (as they are in every operational power plant today as required by both the UN and the EU), on the off chance that something goes wrong, it can be fixed hours before anybody is exposed to radioactive material. Nuclear power is the safest non-renewable method of power production, and safer than every renewable method except for solar. It is also extremely cost effective, costing less in maintenance and fuel than coal, oil, gas, hydro, wind, tidal, and solar, and the same price as geothermal (but quicker and on a larger scale).
Yes, nuclear power plant can be shut down.
There are no licenced nuclear power plants in Utah. There is one research reactor at the University of Utah. Such a reactor is not licenced the way commercial reactors are, in part because they are supposedly incapable of melting down. They are used for a variety of purposes, including making radionuclides used in medicine.
Nuclear power does not release greenhouse gases or other atmospheric pollutants (barring a melt-down), unlike power plants that burn fossil fuels (coal, oil, or natural gas). Unlike solar power, nuclear power is independent of the weather conditions. Unlike hydroelectric power, nuclear power can be installed anywhere.
The ultimate result is the pollution of the environment. Any nuclear accidents leave the area unusable for centuries. When the nuclear reactor melted down in Russia in the 80's it left the entire area radioactive. People can no longer live there and any plants and animals are affected by the radiation that still exists.
A nuclear power plant is no more dangerous than a fossil power plant. In fact, taking into account the global picture, it is less dangerous, from an economic, and an ecological standpoint. This may seem counter-intuitive, but the fact is that radiation hazard is mitigated by the dilution effects of the atmosphere and oceans and, looking at the big picture, nuclear power plants are safer than fossil power plants, hands down.
3
The nuclear power plants are filled with water to keep the atoms from splitting too fast inside the nuclear rod. Because of the earthquake in Japan, the nuclear power plants lost a lot of water in them, which is making the atoms split too fast. Radiation is now leaking from the plants, so crews are going in and dumping seawater into the nuclear plants to cool down the rods.
The tsunami wiped out almost all of Japan knocking down many buildings such as skyscrapers and nuclear power plants that were operating in Japan. The tsunami destroyed the nuclear power plants and radiation leaked out which caused a raging panic among the people of Japan.
Yes, nuclear power plant can be shut down.
There are no licenced nuclear power plants in Utah. There is one research reactor at the University of Utah. Such a reactor is not licenced the way commercial reactors are, in part because they are supposedly incapable of melting down. They are used for a variety of purposes, including making radionuclides used in medicine.
Nuclear power does not release greenhouse gases or other atmospheric pollutants (barring a melt-down), unlike power plants that burn fossil fuels (coal, oil, or natural gas). Unlike solar power, nuclear power is independent of the weather conditions. Unlike hydroelectric power, nuclear power can be installed anywhere.
They melted down and leaked radiation into the ground and the air.
You would have to be atleast 30 miles away from an individual nuclear power plant to get away from the deadly amounts of radiation.
Asia, specifically the Chernobyl Disaster in the former Soviet Union (Russia), in which a nuclear power plant went critical and melted down, rendering the city uninhabitable and causing radioactive clouds to travel globally.
Not normally. If they melt down, they can cause extreme damage. But generally it is a source of good, clean energy.
There were three of them, but one has been permanently shut down. (See link below)
The ultimate result is the pollution of the environment. Any nuclear accidents leave the area unusable for centuries. When the nuclear reactor melted down in Russia in the 80's it left the entire area radioactive. People can no longer live there and any plants and animals are affected by the radiation that still exists.