Even Tepco admitted melt-out is occurring.

Tepco has been stating that Fukushima plants are under control and they can achieve cold shutdown by the end of this year.

However, 11/30/2011, Tepco admitted that melt-out is happening at reactor 1 ,2 ,and 3.

In “their worst senario”, at reactor 1 , all the fuel has melted, it broke through the pressure vessel, dropped to the bottom of the container vessel. They assume the melted fuel is sinking to about 65cm depth of the concrete on the bottom of the container vessel.

Please note that there is only 37cm left to the body of the container vessel.

Also, they assume 57% of the fuel in reactor 2 and 63% of the fuel in reactor 3 have already melted out to the container vessel.

They still assert the situation is stable, but they don’t have any basis.


1号機溶融燃料 65cm浸食
11月30日 19時6分

  1. Pingback: Fukushima Diary
  2. @Cal Abel“Even had they venetd the containments when they could it is doubtful they would have succeeded in preserving their integrity because of the loss of all AC/DC”Venting the Drywell / Torus earlier may have allowed Reactor Pressure to be lowered sufficiently to achieve injection with the Temporary Pump. Aligning alternate injection sources is required by Emergency Operating Procedures and Severe Accident Guidelines – this always includes lowering Reactor Pressure sufficiently to enable injection, or lowering Drywell Pressure sufficiently to enable flooding.Page 11 of the INPO Report… “The decision to complete evacuations before venting containment, and the subsequent equipment and radiological challenges encountered as operators attempted to establish a vent path, delayed injection of water into the Unit 1 reactor. At approximately 0230 on March 12, as Unit 1 depressurized, pressure in the reactor and in containment equalized at approximately 122 psia (0.84 MPa abs). This pressure is above the discharge pressure of the station fire pumps and fire engines. Once pressure had equalized, further reductions in reactor pressure were not possible until containment pressure had lowered. As a result, little to no injection was achieved until after the containment was venetd successfully, which occurred at approximately 1430 on March 12. High containment pressures in Unit 1 contributed to the amount of time Unit 1 did not have adequate core cooling.” Reply

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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