Chernobyl to get new steel lid
$1.4bn 'containment structure'
Ukrainian authorities will spend an estimated $1.4bn of foreign donors' cash covering the remains of Chernobyl nuclear power plant's No 4 reactor with a new "containment structure", the BBC reports.
French company Novarka needs five years to construct the "giant arch-shaped structure", 190 metres wide and 200m long, to replace the crumbling concrete mausoleum poured over the reactor following the 1986 accident. Once in place, the new lid will allow the reactor to be dismantled and the removal of the 95 per cent of its original nuclear material still entombed within.
Ukrainian President Viktor Yushchenko declared: "Today is probably the first time that we can openly look into the eyes of the national and international community and say that a solution to the problem that has long been called the Chernobyl problem was formally found." ®
@ Anonymous "@ Andrew" idiots
Context, people. Context.
Eugene Goodrich said:
So, a containment vessel around a nuclear reactor? Like the one that should have been built there at the same time the reactor was, so that if the reactor were to leak its magic smoke, there'd be a chance to contain it?
In response, Andrew said:
Would not the large explosion / heat kinda wreck any pre built containment before it could be of any use?
Neither of them are referring to the current structure being built over Chernobyl, but rather the feasibility (or lack thereof) of building a containment superstructure over existing power stations, as a preventive measure.
Re: Re: Built in the first place
You quote from http://www.chernobyl.info/index.php?navID=10 when saying the reactor power level dropped to less that one percent "for unknown reasons".
I believe the current consensus is that the experiment protocol called for a reduction in power output to ~20%. However, this was only supposed to take place after the output had already been reduced to 50%. This had not been possible due to an earlier shortfall in grid supply caused by the failure of a power station elsewhere. The reactor was therefore running at normal output when the experiment began.
Reducing the power from 100% to 20% resulted in an increase in the fission poison product xenon-135, which absorbs neutrons. The resulting unexpected drop in reactor output was counteracted by withdrawing the control rods beyond recommended limits.
Additional increases in coolant flow, as called for by the experiment protocol, further reduced the reactor's output, since water also absorbs neutrons. The technicians responded by removing manual control rods. Although the reactor's output was now restored to its expected level, fission was to a large degree controlled by factors outside the technicians' control, i.e. xenon-135, which was eventually expended, and water, which was removed from the core by the design of the experiment itself.
The disaster, from the start of the experiment, to the steam explosion and resulting ignition of the graphite moderator, took approximately 43 seconds.
I will always remember the courage of the people going in to try
to cap and extinguish the inferno.Heroes that knew they were sent
to their deaths trying to save the lives of countless others.
I wish this new structure will be able to be built without more people
dying. That noone else will have to die in the nuclear inferno, ever.