What caused Chernobyl meltdown?

Related questions

1. Did anyone died at Fukushima?
2. Why is heavy water used as moderator?
3. How does an RBMK reactor explode?
4. What is acute radiation syndrome?
5. What does an autistic meltdown feel like?
6. What exactly caused Chernobyl?
7. What happened Trinoble?
8. What does RBMK stand for?
9. Is Fukushima still evacuated?
10. What would happen if a nuclear reactor exploded?

Tags

1. #resulting
2. #result
3. #design
4. #operated
5. #downwind
6. #fires
7. #atmosphere
8. #radioactive
9. #explosion
10. #released
11. #trained
12. #personnel
13. #reactor
14. #accident
15. #least
16. #steam
17. #flawed
18. #inadequately
19. #chernobyl