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

Monday, March 14, 2011

Fukushima Daiichi No. 2 - fuel exposed

TEPCO is reporting that at 8 PM it began injecting seawater into No. 2 reactor, but there was, prior to this, apparently possible full uncovering of the fuel rods. Apparently at 5 PM local the water level (standpipe) reading in the core dropped out of sight low.

This very likely confirms earlier suspicions that No. 2 is in the same failure path that No. 1 and No. 3 were in.

There is now good reason to believe that the primary coolant systems of these reactors have been compromised leading to what essentially would be called a SBLOCA or "Small Break Loss Of Coolant Accident." The degree to which they were compromised may be hinted at by the order in which the reactors have lost their cooling water, although this is highly speculative. What seems better as a supposition is the simple fact that the primaries are compromised in some way, even if small.

More very soon... 2:45 PM Monday 3/14

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