APR: your source for nuclear news and analysis since April 16, 2010

Sunday, March 13, 2011

Fukushima Daiichi No. 3 hydrogen hazard

The Japanese Chief Cabinet Secretary has confirmed to the public the possibility that hydrogen is building up inside Daiichi No. 3 containment exactly as it did with No. 1 and that there is the chance of an explosion identical with, or similar to, that which occurred at No. 1 plant.

There was a brief period in which radiation levels around No. 3 rose again, meaning that it is possible that for a brief time some portion of the core was also uncovered as at No. 1 which would both lead to the increased H2 production and very likely trigger the decision to perform core flood with seawater and boric acid. According to TEPCO these actions have been performed, incidentally, with fire pumps.

UPDATE: Several credible sources in addition to myself are indeed reporting the likelihood of fuel damage at Daiichi No. 3 because of the indications I have described above and it doea appear now that the Japanese government and TEPCO believe this as well.

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