Friday, February 3, 2012

#Fukushima I Nuke Plant: 2 Sieverts/Hr Beta Radiation from Leaked Concentrated Water After Desalination

Gamma radiation was 20 millisieverts/hour. The leak stopped when they tighten the bolt of the tank.

(Ummm... So they are not welded?)

From Nikkei Shinbun (2/3/2012):


TEPCO announced on February 3 that the water leaked from one of the contaminated water storage tanks at Fukushima I Nuclear Power Plant. 2,000 millisieverts/hour beta radiation was detected. The amount of the leak was small, and there was no leak into the ocean. The leak stopped when the bolt was further tightened. The radiation was then shielded with acrylic plates, and the beta radiation dropped to 15 millisieverts/hour.


The bolt may have gotten loose at the joint of a storage tank that stores the contaminated water that was condensed by the desalination apparatus (Reverse Osmosis), letting the water leak. TEPCO said a large amount of radioactive strontium might be in the water. On the concrete where the leaked water was, 22 millisieverts/hour gamma ray was also detected in addition to the beta radiation. It dropped to 1 millisievert/hour after shielding.


The Nuclear and Industrial Safety Agency instructed TEPCO on February 3 to submit a report on the causes of the leaks at the plant and on the measures to be taken to prevent the leaks from occurring again.

Here's the tank that leaked, and there are 100 more such tanks, from TEPCO (2/3/2012):


Anonymous said...

Whoever made the tanks..probably also made the same error with the equipment used in California at San Onofre Nuclear Plant. Darn those bolts--they do it everytime when they are loose, or not installed correctly.

Atomfritz said...

The whole radiation situation could be way more serious than everybody imaginated.
Not only in regard to the actual, still unknown contamination situation in mid-northern Japan.
But also to the Fukushima tank installations, which is going to mass-spill in spring when the frozen water melts which closed the tank leaks.

This clearly shows why it is so important not to judge only from cesium (gamma) measurements, but to test for alpha and beta emissions also.

It is irresponsible that the radiation maps published up to now only take gamma (cesium) radiation into consideration, when in fact the alpha and beta contamination can be much larger.

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