Tepco: Steam may be from gas leaking out of containment vessel at Fukushima Reactor No. 3

Published: July 26th, 2013 at 3:34 pm ET
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Title: Steam Found Near the Central Part of the Fifth Floor (Equipment Storage Pool Side) of Unit 3 Reactor Building
Source: TEPCO Press Release
Date: July 26, 2013

[...] the steam is likely to generate in the following mechanism [...]

The steam is estimated to be the rainwater, which was streamed down the gap of the shield plug and was heated by the head of the PCV. Also, there was a difference between the nitrogen injection amount (16m3/h) and the extracted amount (13m3/h) of the RPV and the PCV. Therefore, the gas including this difference amount of water vapor (approx. 3m3/h) is likely to be leaked from the head of the PCV, etc. It is estimated that this water vapor was cooled since the surrounding air was relatively cold when it was emitted to the upper part of the fifth floor of the Reactor Building via the gap of the shield plug, and it was observed as the steam.

See also: Fukushima Unit 3 steaming again, third time in a week -- Asahi: High radiation levels detected near where it was observed -- Tepco does not know where it's coming from (PHOTOS)

Published: July 26th, 2013 at 3:34 pm ET
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