Nuclear reactors at Fukushima reach cold shutdown temperature

A core spray has helped bring the temperature of Unit 3 at the Fukushima nuclear power plant in Japan under the level needed for a cold shutdown, according to World Nuclear News.

Tokyo Electric Power Co. (TEPCO) said Unit 3’s temperature at the bottom of the reactor vessel read 205.5 F. The benchmark for cold shutdown is 212 F.

Unit 1’s temperature measured 186 F, making Unit 2 the only melted core still above the mark at 235.2 F as of September 6, the article said.

Before September 1, Unit 3’s core was cooled only by steam rising from a pool of water at the bottom of the reactor vessel. The core spray is putting in 3 cubic metres per hour of water while the feedwater line continues at 6 cubic metres per hour. The water isbeing pumped out and taken through a series of treatment lines before storage and re-injection.

The rate of injection will gradually be reduced to 3 cubic metres per hour while the temperature is monitored.

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