Yellow light was seen when reactor 3 exploded

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.

About this site

This website updates the latest news about the Fukushima nuclear plant and also archives the past news from 2011. Because it's always updated and added live, articles, categories and the tags are not necessarily fitted in the latest format.
I am the writer of this website. About page remains in 2014. This is because my memory about 311 was clearer than now, 2023, and I think it can have a historical value. Now I'm living in Romania with 3 cats as an independent data scientist.
Actually, nothing has progressed in the plant since 2011. We still don't even know what is going on inside. They must keep cooling the crippled reactors by water, but additionally groundwater keeps flowing into the reactor buildings from the broken parts. This is why highly contaminated water is always produced more than it can circulate. Tepco is planning to officially discharge this water to the Pacific but Tritium is still remaining in it. They dilute this with seawater so that it is legally safe, but scientifically the same amount of radioactive tritium is contained. They say it is safe to discharge, but none of them have drunk it.


November 2011