The core testing equipment of Unit 1 of Fukushima Daiichi Nuclear Power Station in Japan is almost completely destroyed

The Tokyo Electric Power Company of Japan said on the 16th that almost all the detectors used to detect the insertion state of the control rod of Unit 1 of the Fukushima Daiichi Nuclear Power Plant had been damaged and could not function normally.

According to reports, Unit 1 has a total of 97 control rods, each with a detector installed on it. When TEPCO checked whether the detectors were working properly, it was found that almost all the detectors were damaged. TEPCO believes that because the melted fuel accumulates on the bottom of the pressure vessel of Unit 1, the high temperature generated when the core melts may cause the wires to break or form a short circuit, damaging the detector installed at this location.

TEPCO originally planned to check the condition of the detector to confirm the degree of fuel rod damage and speculate the temperature of the lower part of the reactor, but because the damage of the detector was far beyond expectations, the staff failed to obtain clues. Tepco said it will study other ways to investigate the extent of fuel rod damage.

The control rod is generally made of stainless steel shell wrapped with hafnium or silver indium cadmium alloy and other materials with strong neutron absorption capacity. Its function is to control and adjust the number of fission neutrons in the core of the nuclear reactor to adjust the reactor output power, or in emergency Under the circumstances, the nuclear reaction is quickly stopped to ensure the safety of the reactor.

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