In nuclear power we mean nuclear accident to those events that emit a certain level of radiation likely to be harmful to public health.
Nuclear accidents are classified as nuclear accidents and incidents by severity. And while the nuclear accidents and radioactive accidents are included. to understand, a nuclear accident could be the failure of a reactor of a nuclear power plant accident and radiation could be pouring a radiacióna source of a river.
Despite the known nuclear accidents have occurred at nuclear power plants can also happen in other centers where working with nuclear energy, such as hospitals or research laboratories.
To determine the severity of an accident defined an International Nuclear Event Scale (better known by its acronym in English INES).
Because the secrecy of governments and the companies that own nuclear power plants is difficult to determine the severity or impact extensióny one nuclear accident can assume.
civilian nuclear accidents
Occurred in the 1950 Three outstanding nuclear accidents
- December 12, 1952 in Canada the first serious nuclear accident, nuclear reactor in Chalk River NRX occurs.
- also in Canada and in the same nuclear plant Rriver Chalk, May 24, 1958: NRU reactor in a fuel rod uranium caught fire and split in two while trying to remove the nu core of the reactor.
- United States, 1959: A sodium cooled reactor suffered a partial core meltdown at the Santa Susana Field Laboratory near Simi Valley, California .
In March 1979 the nuclear power plant at Three Mile Island had a serious nuclear accident after the first year of operation. Misinterpretation of data caused very serious errors in certain decisions of plant personnel. Although the core of the nuclear reactor was heavily damaged was limited radioactive products overseas escape. The accident was classified as Level 5 on the International Nuclear Event Scale (INES)In April 1986, came the most significant nuclear accident in history at Chernobyl nuclear power plant by a series of human errors in the course of a test plantificadas previously. It was classified as level 7 ("major nuclear accident") on the INES scale.
In October 1989, the incident of the nuclear power plant took place I. A fire in the electric generator caused a mechanical failure, which led to a flood of sea water reactor cava and inoperability of some of the safety systems. The incident was classified as level 3 ("major incident") on the INES scale, since no release of radioactive products abroad occurred, nor was it damaged the reactor core and there was no contamination within the location.
In September 1999, occurred the nuclear accident at the treatment plant Tokaimura uranium fuel, company-owned JCO in Tokaimura. All signs pointed to was due to human error. The accident was classified as level 4 according to the INES scale ("accident without significant off-site risk"), since the amounts of radiation released to the outside were very small, and within the li , set limits, but within the site, damage to equipment and biological barriers were significant, besides the fatal exposure of workers.
In Fukushima, on 11 March 2011 witnessed one of the worst nuclear accidents in history after the Chernobyl nuclear accident. A 8.9 magnitude earthquake off the northwest coast of Japóny subsequent tsunami severely affected the Japanese nuclear plant in Fukushima.