Saturday, October 29, 2011

Fukushima is Largest Ocean Release

The nasty lesson of course is that throwing the damn thing into the ocean actually fixes the problem.  In fact once a reactor hits meltdown, that is surely the smartest thing to do.  It is not a neat engineering solution to a nasty under predicted problem but it is pretty fool proof and stops the problem of increasing aerosols which is not a solution.

Again, no one would ever permit such a plan to be put in place beforehand but somehow we need to think more like this at times.

It appears that the major contaminant mostly ended up in the ocean, solving a lot of problems.

Generally I am a fan of natural ocean dilution of many traditional waste streams, but no protocols are even slightly salable.  For instance we haul municipal garbage from the ocean up to the desert in order to mummify it for millennia of natural preservation.

I once suggested that we select an atoll with a sealable lagoon as a far better solution (of course is wanted to annoy some self righteous enviros at the time).  Aside from baiting Greenpeace, the idea actually has plenty of merit, far in excess of any scheme to build mountains in the desert.

Nuclear pollution of sea from Fukushima was world's biggest

by Staff Writers

Paris (AFP) Oct 27, 2011

France's nuclear monitor said on Thursday that the amount of caesium 137 that leaked into the Pacific from the Fukushima disaster was the greatest single nuclear contamination of the sea ever seen.

But, confirming previous assessments, it said caesium levels had been hugely diluted by ocean currents and, except for near-shore species, posed no discernible threat.

From March 21 to mid-July, 27.1 peta becquerels of caesium 137 entered the sea, the Institute for Radiological Protection and Nuclear Safety (IRSN) said.

One peta becquerel is a million billion bequerels, or 10 to the power of 15.

Of the total, 82 percent entered the sea before April 8, through water that was pumped into the Fukushima's damaged reactor units in a bid to cool them down, it said.

"This is the biggest single outflow of man-made radionuclides to the marine environment ever observed," the agency said in a press release.

Caesium is a slow-decaying element, taking 30 years to lose half of its radioactivity.

The IRSN said large quantities of iodine 131 also entered the sea as a result of the disaster, caused by the March 11 9.0-magnitude quake that occurred off northeastern Japan.

But iodine 131 decays quickly, having a half-life of eight days, and the contamination "swiftly diminished," the report said.

The IRSN said that, for the Pacific generally, caesium levels would ultimately stabilise at 0.004 becquerels per litre thanks to the diluting effect of powerful ocean currents.

This is twice the concentration that prevailed during atmospheric nuclear testing in the 1960s.

"These levels should not have an impact in terms of radiological safety," the IRSN said.

However, "significant pollution of seawater on the coast near the damaged plant could persist," because of continuing runoff of contaminated rainwater from the land, it said.

"Maintaining monitoring of marine species taken in Fukushima's coastal waters is justified," it said.

The IRSN cited deep-water fish, fish at the top of the marine food chain and molluscs and other filtrating organisms as "the species that are the most sensitive" to caesium pollution.

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