Pressure drops inside vessel at Fukushima plant
NHK -- Feb 22
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.

- NHK

東京電力は、福島第1原発の格納容器内部の水位が低下していると発表した。 格納容器内部の水位の低下は、1号機で15日から始まり、40cmから70cm程度、3号機は17日から始まり、30cm程度としている。 原因について東電は、格納容器は2011年の東日本大震災による原発事故で損傷していて、2月13日に発生した地震で損傷部分が大きくなった可能性があるとしている。 現在も1日数cm水位が低下していて、この傾向が続く場合は、現在、核燃料デブリを冷やすために格納容器に1時間に3トン入れている注水量を増やすなどの対策を検討している。 一方で、格納容器から漏れている水は建屋内部に流れていて、デブリの冷却や外部への影響はないとしている。 - FNNプライムオンライン

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