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Takahama nuclear reactor in Fukui halted after alert goes off

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So much fake political rage elsewhere but nothing when it matters.

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Didn’t think so

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Nobody’s bothered?

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Not surprised they buried this away as the story gets worse as the real series of events becomes clearer. 15 hours before the shutdown, warning alarms on the control rod assembly.were already going off.

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Why is this in Technology? Surely National at least.

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They are in process of negotiating another 20-year extension as its 40-year life expectancy had reached 37 years and was due to run out. Very bad timing.

Many conflicting details among what few updates have been released but they are now looking seriously at completely replacing the corroded narrow-gauge steam piping heat exchangers of Nos 3 & 4, that is if they still have the technical know-how, and if they can guarantee to protect the workers from radiation exposure.

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At least the safety procedures worked.

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Reactor scram. It's automatic. This is the basic way you prevent a Chernobyl.

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Neutrons, not neutrinos. I doubt they have any neutrino detectors at nuclear power plants as neutrino detectors are quite large things in themselves or a large number of smaller individual detectors like the antarctic "ice cube" neutrino detection array.

If no other indication of issues were found it might have just been a neutron detector failing. Any material that is subjected to neutron bombardment gets changed physically either by physical damage or by the materials it is made up of having their original atomic structure changed to a different isotope of those materials.

Neutrons by themselves don't combine chemically so they have to be detected by ionizing radiation from their collisions. A small number of neutrons will undergo neutron decay and produce hydrogen but that would not be sufficient to provide a rapid reliable test of their presence.

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I don’t get it. A rapid decrease of neutrinos indicates already quite lesser fission activities. So that halting of the unit surely leads to even less neutrinos and causing next such alerts. Maybe just using a few newer rods will do. The detectors also seem to be ok, because it’s improbable that two of four would show the same false alert reaction at the same time for no reason. On the other hand, why don’t all four bring an alarm then? It’s really a bit strange, isn’t it? Obviously it should be checked carefully as this important and sophisticated technology doesn’t allow too many errors at the same time.

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