Detonation or Deflagration at Unit 4? Experts: “Huge detonation sound” when it was severely damaged after 3/11

Detonation or Deflagration at Unit 4? Experts: “Huge detonation sound” when it was severely damaged after 3/11 (ENENews, Oct 1, 2012):

Follow-up to: NRC officials suspected a ‘detonation’ at Reactor No. 1 weeks before Gundersen postulated that scenario at No. 3

First there was a suspected detonation at Unit 3, then at Unit 1, and now at Unit 4. The distinction between a detonation and deflagration is discussed here: Japanese study says ‘detonation’ occurred at Unit 3 — “No containment in the world can withstand a detonation shockwave” (VIDEO)

Via Team H2O Project, director Kenichi Ohmae (http://www.fairewinds.com/sites/fairewinds.org/files/Fuku%20Timeline.pdf):

Page 78

Chronology of Unit 4 […]

3/14

04:08 SFP temperature was confirmed as 84*C.

11:01 Unit 3 explosion

3/15

06:12 (Highlighted Yellow) Huge detonation sound. Reactor building severely damaged (4th & 5th floor)

Page 219

If we calculate the amount of hydrogen, which were generated and detonated in No.3, and shifted to No. 4, could the explosion in No. 4 explosion occur?

• TEPCO calculated that the amount of hydrogen generated in No. 3 from the time of meltdown to explosion was about 600-700 kg.

• This amount needs to be sufficient to destroy the floor 4 & 5 of No. 3. and floor 4 & 5 of No. 4. => 12% of hydrogen level destroys 400 mm concrete on 4th floor. 4% of hydrogen level destroys 250 nun concrete on 5th floor.

• Theoretically. 600-700 kg of hydrogen could accumulate in the level above (more than 12% on 4th Fl.. and 4% on 5th Fl.). However, approximately more than 13% of hydrogen level is necessary for detonation [Emphasis Added]. Further verification is necessary.

Nuclear expert Arnie Gundersen explains more about the differences between a detonation and a deflagration here

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