What does nuclear meltdown mean?

Related questions

1. How long until Chernobyl will be safe?
2. How long did it take to evacuate Chernobyl?
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4. How many people died as a result of Chernobyl?
5. What animals live in Chernobyl?
6. Do people live in Chernobyl today?
7. Do animals still live in Chernobyl?
8. Does Chernobyl have mutants?
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Tags

1. #regulatory
2. #energy
3. #nuclear
4. #international
5. #defined
6. #atomic
7. #accident
8. #severe
9. #agency
10. #reactor
11. #overheating
12. #results
13. #partial
14. #meltdown
15. #damage
16. #officially
17. #commission