3/14/2011, reactor 3 exploded.
Arnie Gundersen, C.Busby and other foreign experts pointed out it was a nuclear explosion though Japanese government has been stating it was a hydrogen explosion.
According to Arnie Gundersen’s explanation,the blast had 3 phases.
- 1: Hydrogen explosion
- 2: Nuclear fuel in the spent fuel pool (more than 550 assemblies) had nuclear explosion
- 3: Second nuclear explosion
He says the dark brown mushroom cloud was made of powder of plutonium.
Gundersen Postulates Unit 3 Explosion May Have Been Prompt Criticality in Fuel Pool from Fairewinds Associates on Vimeo.
On 9/27/2011, a Fukushima citizen, Mr.Toshiyuki stated that he saw yellow flash before the blast.
It is said in an interview.
He is a man from Iwaki shi, where is about 50km away from Fukushima plant, has a daughter,a son,wife and parents. He is self-employed and is involved in a medical industry.
He has been in Iwaki shi since 311.
When reactor 3 exploded on 3/14, he was at the 50 km point.
He says he was more surprised at the yellow light/flash than the explosion itself.
We at Fukushima Diary are looking for potential explanations for what the yellow light / flash was.