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@fitter Look at it like an aquarium (the sfp). If we just keep adding water to our fish tank and don't do a partial water change the water gets nasty fast even with the filtration system. As you add water back in to make up for evaporation it concentrates the junk in the water. The SFP is leaking but lots is evaporating and they are just topping off so there is likely lots of junk in that water between the rods giving off things, rubble in the pool and junk in the water.

Good thing they have fresh water now, or the pool would end up as a pile of salt.

@Nancy Ironically, those of us in the saltwater aquarium hobby, top off our tanks with "fresh" water, not salt water. Topping off with "salt" water would kill our fish and corals, because in a tank, the salt content increases with evaporation.

while tepco pretends everything to be clean and under control, it's very disturbing to think about the corium that is very unlikely to cool down within 6-9 months. most probably they have to deal with it for the next 1000 years. or how do you put out a volcano ?

@Debra Beckham are you going to use salt from japan and have glow in the dark fishes???

@Edano About that Cobalt-60, note how Tepco measured the amount of Co-60 in the Unit 3 turbine building, and then re-evaluated it to non-detectable. www.tepco.co.jp

@Ralph Unger my question is salt weighs 72lbs /ft2 is there a accumulation of salt weight going on or is it infact dissoling and overflowing with the water ???

@fitter They said that they reduced the amount of water they were using to limit the overflow.

@Bobby1 So it goes from 7.0x10^2 to undetectable and the reason given is that the original numbers were evaluated based on 'main peaks' while the updated numbers were evaluated based on 'radiative balance' -- can anyone explain that a bit?

@Ralph Unger thats what brings up the question of additioal wieght..... the pools were not designed to have "how much" salt laying on the bottem and its it infact inhibiting the flow of water to the bottom sections of the fuel?????

Salt is lighter then water, the only concern would be restriction of water flow. They are using fresh water now so it is no longer a concern except for the corrosive effects of the salt which at high temperatures can be massive.

@Ralph, did the person you contacted say anything about the cobalt in the readings? Wondering if that one reading that was later removed is in the realm of correct and if it means anything?

Because of turbulence, that is not guaranteed. But is should help a lot, but they limited the overflow at about the same time they switched to fresh water.

It looks like a mistook the group of footnotes for a single 'set' -- the footnote for the Cobalt simply states that the reading were based on 'main peaks' -- but that still doesn't explain the reduction from something to nothing. At least, not with my limited understanding and perspective. @Bobby1 same footnote on the Cerium-144

Do they have any thermals that show better detail on the hot spot in #3 (presumably the SFP). The scales are generally 0 to 30 or 40, which gives pretty good detail on #4, but leaves #3 maxxed out. Also where do we find those thermals, can't locate them?

From TOD " I do question the use of seawater cooling. I hope the Japanese have considered the danger they have created by introducing oxygenated seawater into this stainless steel piping and pressure vessel at boiling temperatures. These stainless steels are extremely susceptible to chloride stress corrosion cracking.

Since residual weld stresses and tensile stress in piping, valves, control tubing, etc. are always present, Standard Operating Reactor water quality standards require keeping chlorides at parts per billion levels. Seawater has about 3.5% or 35 grams per liter of salinity!!! (i.e. 35,000,000 parts per billion).

I have no way of knowing how many days they have before a stainless steel component suddenly cracks, but if it were me, I would be advocating an emergency program to get pure deionzied cooling water back into this stainless steel system ASAP. In laboratory tests in boiling chlorides, cracking of stainless in tensile stress can occur within days - they have at most a few months if they keep boiling sea water in this system and yet another disaster occurs." www.theoildrum.com

@marie rich ty, but not looking at cicrculation issure, there would be a different "variavble" if the SPF has a foot or so of salt on the bottom..

@General Armstrong not sure I understand your last comment... are you saying that in the future is degrades the containment structure, or while there is a opening now????

From TAD as well " Richard T. Lahey Jr., who was General Electric’s chief of safety research for boiling-water reactors when the company installed them at the Fukushima Daiichi plant, said that as seawater was pumped into the reactors and boiled away, it left more and more salt behind.

He estimates that 57,000 pounds of salt have accumulated in Reactor No. 1 and 99,000 pounds apiece in Reactors No. 2 and 3, which are larger."

@Ralph Unger or anybody Have wondered but never seen addressed -- whether the salt having deposited might then dissolve as new fresh water is added? By now they must have put a lot more fresh in than salt.

@General Armstrong without drawings and using bld 1 as a base, it really is just guessing... but they have been putting out pics that you can trace out the systems, based on buld 1,, now is that correct -- anyones guess

@ General, I don't know but it would be baked on and I think it would be hard to dissolve.