What caused Chernobyl reactor to explode?

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Tags

1. #rapid
2. #second
3. #circulation
4. #failing
5. #debate
6. #chemical
7. #still
8. #exactly
9. #hydrogen
10. #reactions
11. #system
12. #steam
13. #explosions
14. #reactor
15. #increase
16. #scientists
17. #pressure
18. #explosion
19. #caused