We grabbed deposits that had accumulated at the bottom of the PCV to examine their shape and size, and we also confirmed that the deposits could be moved. The following year in February 2019, we conducted a “contact investigation” for the first time during which we touched deposits in order to examine hardness and brittleness. The investigation also showed that water is dripping from above and keeping the fuel debris at the bottom cool and stable. Some of this footage showed deposits that are assumed to be fuel debris. We successfully took footage from immediately below the Reactor Pressure Vessel (RPV), where it is assumed that fuel debris exists. In February 2018, an investigation of the inside of the Primary Containment Vessel (PCV) was conducted in preparation for fuel debris removal. Into the building from Unit 3 through pipes. An explosion also occurred at Unit 4, which was undergoing periodic inspection, due to hydrogen that flowed In Units 1 and 3, hydrogen leaking from the Primary Containment Vessel accumulated in the Reactor Building and causedĮxplosions. Hydrogen was generated due to the chemical reaction that ensued. The earthquake, thereby resulting in a loss of cooling functions.Īfter fuel cooling functions were lost, the temperature of the fuel rose causing a melt-down and a significant volume of However, these auxiliary power sources were ultimately rendered inoperable by the tsunami that struck the site following The cooling of fuel, for which power was needed, continued using onsite emergency power sources after external power Units 1~3 which were in operation at the Fukushima Daiichi Nuclear Power Station (1F), and the cooling of fuel began. The Great East Japan Earthquake, which occurred at 2:46pm on March 11, 2011, triggered an automatic scram of
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |