Fukushima Nuclear Power Station One Unit Detection Instrument Almost Completely Destroyed

Japan’s Tokyo Electric Power Co., Ltd. said on the 16th that the detector used to detect the control rod insertion status of the No. 1 unit of the Fukushima Daiichi nuclear power plant was almost completely damaged and could not function properly.

According to reports, Unit 1 has a total of 97 control rods, each of which is equipped with a detector. Tokyo Electric Power Co. found that the detectors were almost completely damaged when the power-on check detectors were working properly. Tepco believes that because the melted fuel accumulates on the bottom of Unit 1 pressure vessel, the high temperatures generated during core meltdown may cause the wire to break or form a short circuit, causing the detector mounted at this location to be damaged.

Tepco originally planned to check the condition of the detector to determine the extent of damage to the fuel rod and to infer the temperature in the lower part of the reactor. However, due to the damage of the detector far beyond expectations, the staff failed to get clues.

The control rods are generally made of materials with strong neutron absorption ability such as neodymium or silver indium cadmium alloy wrapped in a stainless steel shell. Their role is to control and regulate the number of fission neutrons in the nuclear reactor core to regulate the reactor output power, or in emergency Under the circumstances, nuclear reactors are quickly stopped to ensure the safety of the reactors.

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