There are concerns an increase in nuclear activity could damage the old container built to house the power station.
The sarcophagus was eventually replaced by a new containment system called the New Safe Confinement structure, which was only completed in 2019.
Currently the neutron counts are not rising fast, but Hyatt added there were concerns they could accelerate exponentially. However, such a reaction could damage the delicate structure of the original sarcophagus and cause it to collapse. The New Safe Confinement has been cutting rainwater off from Unit 4, but new data suggests that the drying of the fuel is somehow causing radioactivity to increase in certain locations, rather than decrease."It's just not clear what the mechanism might be," Hyatt told Science Magazine.
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