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Fukushima Daiichi Nuclear Power Plant Containment Vessel Water Level Continues to Drop Due to Earthquake

February 23, 2021, 5:05 PM

Tokyo Electric Power Company (TEPCO) summarized the impact of the February 13 earthquake on the Fukushima Daiichi Nuclear Power Plant on February 22, and said that the water level in the containment vessel that houses the reactor continues to drop. The Nuclear Regulation Authority (NRA) has said that water injection is continuing and that there are no safety issues at present, but has called for tighter monitoring.

At the Fukushima Daiichi Nuclear Power Plant, water is being injected to cool the melted down nuclear fuel, but the water level in the containment vessels of the Unit 1 and Unit 3 reactors has dropped by several dozen centimeters and has been on a downward trend ever since.

In addition, nitrogen has been injected into the containment vessel to prevent hydrogen explosions and increase the pressure, but in the Unit 1 reactor, the pressure gauge that measures the difference from atmospheric pressure has dropped from 1.2 kilopascals to 0.1 kilopascals and is now almost at atmospheric pressure.

The Tokyo Electric Power Company (TEPCO) says it will continue to monitor the water level and pressure, as it is possible that the earthquake may have caused damage that was created 10 years ago to spread, causing the water level and pressure to drop.

In addition to the above, it was also found that six tanks used to store water after treating contaminated water were displaced by up to 5 cm due to the earthquake.

The displacement was within the design assumptions, and no water leakage has occurred.

There was no change in the values of the monitoring posts after the quake, and there was no leakage of radioactive materials to the outside.

The Nuclear Regulation Authority (NRA), which received the report, said that cooling of the nuclear fuel and nitrogen injection are continuing and that there are no safety issues at present, and asked TEPCO to strengthen its monitoring.

February 25, 2021 Posted by | Fukushima 2021 | , , | Leave a comment

Pressure drops inside vessel at Fukushima plant

February 13 earthquake could have exposed damaged part

February 22, 2021

Tokyo Electric Power Company has found that the pressure inside one of the reactor containment vessels at the Fukushima Daiichi nuclear plant has dropped.

The utility said the earthquake that hit the area on February 13 may have been to blame. TEPCO said no radioactive material has leaked.

The nuclear plant in Fukushima Prefecture in northeastern Japan is now undergoing decommissioning.

TEPCO said it confirmed at around 6 p.m. on Sunday that pressure inside the vessel of the No.1 reactor dropped to 0.9 kilopascals from the usual 1.2 kilopascals. Nitrogen is being added to the vessel to raise the pressure and reduce the risk of a hydrogen explosion.

TEPCO found that after the quake the level of water in the containment vessel had dropped.

It said the part damaged in the 2011 nuclear accident may have been exposed after the water level dropped, possibly causing an air leakage and the drop in pressure.

TEPCO said it is continuing to pump water into the vessel and there should be no safety problem.

It said there have been no abnormality in the measurements at radioactivity monitoring posts in the compound.

The utility said it will keep watching the data at the vessel and other facilities

February 25, 2021 Posted by | Fukushima 2021 | , , , | Leave a comment