Nuclear Double Whammy – Fukushima Unit 3 Also Suffers Hydrogen Blast

What a double whammy? One of the three least affected Fukushima unit 3 succumbed to Hydrogen bubble induced blast, blowing out the concrete building today. If hear I it right someone failed to notice the fuel gauge and DG sets ran out of fuel. In two hours time due to lack of forced circulation of water in the reactor vessel, fuel rods became so hot that steam must have formed around the top side of these enriched Uranium , Zirconium claded fuel assemblies. Once temperature goes above 1204 Degrees C, the water vapour and Zirconium will violently react and generate Hydrogen. It is explosive gas and once mixed with Oxygen, there will be explosion. Oxygen will be formed as a result of Zr + water reaction itself along with Hydrogen. 4% Hydrogen is good enough to explode ferociously. That could be the cause for blast in second occasion.

In each of these blasts a large amount of radioactive material will escape into human environment. Iodine can reach Thyroid, Cesium in food plates. That will be awful for the population.

Second explosion at Fukushima proves a great error is design of the safety systems , back up DG failure and assessment of multiple failures of hardware , all in tandem.

The Big Lesson is that when there is Nuclear disaster, the common human errors, which otherwise would have no consequence can be devastating.

By the way the other three units at this location are safe. You know why? They were shut down for maintenance for some weeks. So they were already cooled off. Did not need DG back up.

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One thought on “Nuclear Double Whammy – Fukushima Unit 3 Also Suffers Hydrogen Blast

  1. I dont think it was the DG running out of fuel – which probably would have happened anyway, which caused the steam explosion. The DG got submerged when the tsunami hit the station 1 hour after the quake. The DG were at a basement level (poor design basis) because the sea wall around the plant was supposed to ensure that there was no water ingress (another poor design consideration)The Indian reactor at Kalpakkam has its electrical systems installed at least 50 feet high to take account of such flooding eventualties (inc the air conditioners, geysers and power points at the MAPS guest house!)Secondly, it was the water gauges which indicate level of coolant water in the reactor, which stopped giving accurate readings.Not the fuel gauge of the DG’s. The DG;s would have stopped functioing much before they ran out of gas. This exposed the top half of the fuel in the core to get exposed to air. Which can lead to partial meltdown – which has probably happened. Because taces of cesium and iodine have been evidenced.

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