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In the case of Chernobyl the reactor core exploded, and at Three Mile Island it partially melted.

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Q: In what ways did the incident at Three Mile Island differ from that at Chernobyl?
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How are the meltdowns at Chernobyl and Three Mile Island similar and how are they different?

In brief, both accidents involve gross failure of a nuclear reactor. The two reactors are of different types, so there are some things that are unique to each plant. Both had the reactor cores damaged catastrophically. And in both cases, radiation was released ourside fuel element cladding and outside containment barriers. What is different is that in the Chernobyl disaster, the atomic pile caught fire. I was built using graphite blocks for moderators. At Three Mile Island (TMI), there was no fire. The radiation released at TMI was some nasty stuff including fission fragments from failed fuel element cladding, but it was released in limited quantities. TMI was an accident. In Russia, things were different. It was a disaster. At Chernobyl, as the core burned, massive clouds of highly radioactive fission byproducts (from the failed fuel elements) were caught up in the fire column and swept aloft with the smoke and heat. This caused the surrounding area to have to be evacuated and some of it was actually abandoned. The small city of Pripyat became a ghost town. This newly constructed community of about 50,000 or so was abandoned. People just walked away. They literally left everything behind and departed with just the clothes on their backs. There were a number of fatalities at Chernobyl, and none at TMI. Some reactor workers and a number of emergency personnel responding to the fire died of radiation sickness. And a number of civilians lost their lives within a few weeks of the accident. One account logged by a helicopter pilot (several choppers dumped water on the fire from aloft) said that in the night, the column of smoke and debris from the fire glowed in the darkness due to the radioactivity. Helicopter pilots were among those who died as a result of their heroic efforts to douse the flames. Links are provided to relevant Wikipedia articles.


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Related questions

Are nuclear explosions -like atomic bombs- possible?

The United States had an incident in the Three Mile Island and Ukraine had one in Chernobyl but the results were not compared as the results reached on Japan in world war two.


What was the impact of the three island incident?

The primary impact of the three mile island incident was to increase nuclear safety. This has had lasting effects on the industry.


What was the impact of the three miles island incident?

The primary impact of the three mile island incident was to increase nuclear safety. This has had lasting effects on the industry.


Could the accidents of Three Mile Island and Chernobyl have been avoided yes or no?

Yes


What candy bar has the same name as a nuclear generating plant?

* Chernobyl Chews * Chocolate Chernobyl Chews * Three Mile Island Mint Bar


Who was president during Three Mile Island?

The president at the time of the Three Mile Island nuclear incident was Jimmy Carter.


How many syllables in Chernobyl?

Chernobyl has three syllables: cher-no-byl


Was the nuclear accident at Chernobyl more devastating than the accident at Three Mile Island?

No, not according to an Forbes article that states Chernobyl disaster (level 7 on International Nuclear and Radiological Event Scale) was magnitudes worse than the 2011 Fukushima nuclear disaster in Japan, which was a level 4 and likely be upgraded to a level 5.


What caused many Americans to worry about nuclear power?

The incident at Three Mile Island.


What event caused many Americans to worry about nuclear power?

The incident at Three Mile Island.


What is a site of a famous nuclear disaster of 1986?

Three mile Island near Harrisburg,PA March 28, 1979


What year was three mile island disaster?

1979. You call it disaster, and it was for the plant owners as they lost their investment, but it was not in the same class as the Chernobyl disaster, which really was a disaster.