Why do spent fuel rods need to be cooled?

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Tags

1. #called
2. #water
3. #reaction
4. #provides
5. #uranium
6. #things
7. #radiation
8. #cooling
9. #other
10. #spent
11. #submerged
12. #thing
13. #shielding
14. #fission
15. #proceeds
16. #reactor