According to the news, efforts to pump nitrogen into containment vessels would last until

Japanese officials say efforts to pump nitrogen into the containment vessel of a damaged nuclear reactor appeared to be succeeding. Operators of the Fukushima power station reported Thursday that pressure is rising inside the plant’s No.l reactor. They said this shows that the nitrogen is entering the containment vessel as planned. They said the operation could last for another five days and may be repeated at two other reactors. Technicians with the Tokyo Electric Power Company also are releasing 11,500 tons of polluted water into the sea. They are doing this to make room in a storage area for water from the damaged reactors.