It looks like you're using an Ad Blocker.
Please white-list or disable AboveTopSecret.com in your ad-blocking tool.
Some features of ATS will be disabled while you continue to use an ad-blocker.
...Its time for entombment.
Originally posted by intrptr
Hey zworld... Sorry if I fail to reply sometimes on your or others comments. I may not reply, but always will read them.
I though trying to tomb these things when they are still emitting would only lead to more hydrogen build up and more explosions blowing the lid off whatever they try to cap it all with?
Originally posted by qmantoo
...Its time for entombment.
Why try to make ourselves feel better? Is entombment really practical for something which can never be contained ? We cannot get beneath it to contain the tons of melted radioactive material, so how will we ever contain it.
“We either wait a few hundred thousand years for the radiation to cool, or we wait a few weeks to get organized and start filling those containments with concrete using boron sand,” says a physicist familiar with the reactors....Boron is a widely found element in the earth’s crust and is used for everything from making glass to manufacturing wash day detergents and bleaches. It also has the property of being extremely good at stopping neutron type radiation, and is used as shielding in nuclear reactors.
Originally posted by Aircooled
Henry's film is back. Make a copy quick.
Originally posted by Aircooled
#4 looks more open concept today. Z, I kow someone way back in the thread mentioned sealing off the quay. I thought it was great idea at the time, and I'll never understand why they didn't turn the quay into their tank. The Pacific would be better today if they had.
N.R.C. spokeswoman Victoria Midlyng says the procedures the worker was supposed to follow were improper anyway. And she says managers at the plant had given that worker the green light to do things differently.
"Nobody took the time to really focus on the safety significance of this activity," Midlyng said, "Nobody stopped in their tracks and said 'hey, what are we doing here? We need to rethink this.'"
The aforementioned attachments are only available in Japanese. We apologize for any inconvenience this may cause.
We will continue to investigate and announce the facts and so forth once they are revealed and confirmed.
[A]n interim report released Friday by the Tokyo Electric Power Co. (TEPCO) [...] was the first to detail testimonies from workers, who were hailed as heroes in the weeks following the accident as they took extreme health risks to try to prevent a worse nuclear disaster. [...]
“When I got to the place to open the valve, I heard eerie, deep popping noise from the torus (a donut-shaped structure at the bottom of the reactor),” he said.
“When I put one of my feet on the torus to reach the valve, my black rubber boot melted and slipped (due to the heat).” [...]
I have translated the abstract at the top of www.tepco.co.jp...
An estimate of Fukushima Daiichi units 1, 2 and 3's core status was publicly released on 23 May, and although cores in all three units were largely damaged and melted fuel had moved or fallen into the lower plenum, while not refuting the possibility that melted fuel had fallen ouside of the reactor pressure vessel, we estimated that most of it was being cooled in the vicinity of the lower plenum. The present public release consists of core status obtained by MAAP analysis and core status estimates based on core status evaluation that can be inferred from the behaviour of measured temperatures in every part of the plant.
Material for core status estimates were obtained by various operations, investigations, studies, and analysis performed since May. The estimates that were obtained are the following ones:
1) From the temperature behaviour of every part when injection rate is changed or when injection route is changed, it can be inferred regarding unit 1, as the RPV temperature decrease is large, that there are few fuel debris inside RPV, and regarding units 2 and 3, that fuel debris exist inside RPV.
2) As a result of calibration and of filling unit 1 and unit 2's water level gauges' reference tools with water, we can infer that a water level is not formed at the original fuel location inside the reactor, and that there is no fuel at the original location.
3) Conducting nuclear substance analysis of the gasses inside unit 1 and unit 2's primary containment vessels, we infer from cesium concentrations that fuel melted more at unit 1 than at unit 2.
4) Evaluating the heat balance of decay heat production and cooling, we estimate that the part of unit 1's decay heat that could not be cooled by the isolation condenser and by the high pressure core injection is about 3 times higher than that of units 2 and 3, and that this lead to early fuel and RPV damage.
5) From an estimate based on a RPV heat balance model, we infer that as of 10 October, at both units 2 and 3, the proportion of uncovered fuel is 3% or less, and that the fuel is largely submerged.
6) From an analysis concerning core-concrete reaction, we infer that even at unit 1, which is thought to contain the highest proportion of fallen fuel, the pedestal floor's erosion depth does not reach the PCV's inner wall.
Based on the above information and general analysis, it was possible to take further the estimations of core status we had performed in May. As a result, concerning unit 1, it can be thought that nearly all of the fuel that melted after the accident fell down into the lower plenum, and that there is almost no fuel left in its original reactor location. It can be thought that a great part of the debris that fell down into the lower plenum, fell down onto the primary containment vessel's pedestal. However, although the fuel debris create a core-concrete reaction, they were stopped due to the cooling performed by water injection and due to the decrease of decay heat, and we estimate that in the present situation, it remains inside the PCV where it is receives stable cooling. Concerning units 2 and 3, it can be thought that the fuel debris are for one part in the core's original territory, and for another part they have fallen into the lower plenum or onto the pedestal, and we estimate that in whichever place they might be, they are receiving stable cooling.
Nevertheless, far from observing directly into the reactor and into the primary containment vessel, this is a core status estimate based on various indirect informations and analysis, and in the future, using some methods, we want to grasp the situation through direct observation.