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Regarding No. 3:
  • It suffered less tsunami damage, for example the DC switchbox remained intact, and multiple cooling systems were operational.
  • The first cooling system failed probably due to batteries running out, the second because the water level gauge stopped and thus there was no reference value. The water level gauge was restored, but the cooling system probably didn't start again due to low pressure.
  • Again, the rate of water injection was low. According to TEPCO simulations, the fuel got uncovered about four hours after the stoppage, and core damage another two hours later, and another 20 hours later (66 hours after the earthquake), the corium damaged the pressure vessel.
  • According to NISA, the above events progressed slower (pressure vessel damage 79 hours after the earthquake).
  • The iodine and caesium that escaped was less than one percent.

Regarding No. 4:
  • Taking evaporation of the spent fuel pool into account only, the hydrogen explosion cannot be explained. Lack of significant damage to the fuel rods (as indicated by the water sample) and lack of visible cracks on photos also point against this possibility.
  • So they don't say explicitly but imply that the other theory now looks more likely: hydrogen from No. 3 entering No. 4 via the piping to the joint exhaust stack (there is a diagram showing the route of hydrogen from No. 3 to different exit points in No. 4).


*Lunatic*, n.
One whose delusions are out of fashion.
by DoDo on Mon Jun 13th, 2011 at 08:16:26 AM EST
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