Unit 2 already had one muon scan done by Nagoya University that found no fuel to likely be in the reactor vessel. They did have a small level of uncertainty because they were unable to image the very bottom of the reactor vessel. This caused them to say there was a chance some fuel debris could remain in the bottom of the reactor vessel. A recent scope inspection of unit 2′s reactor pedestal included a little publicized look at the bottom of the reactor vessel. This found a “small hole” in the bottom of the reactor. This likely means that the entire bottom head is not gone as would be found in a massive failure but instead burned a smaller hole in the reactor bottom that allowed melted fuel to leak out.
TEPCO had a larger set of muon detectors planned for unit 2 but they discovered one unit was too large to place in the turbine building location. Now they have announced a single small muon detector that will be used to attempt to image the lower portion of the reactor vessel. This should answer the question if there is any remaining fuel debris in the bottom of the reactor vessel. What all of this doesn’t find out is where the melted fuel has actually gone. This will not look at the lower section of the pedestal where the fuel fell as it left the reactor vessel.
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Filed under: Uncategorized · Tags: 2016, bottom head, fukushima, mini, muon, unit 2