buzzanddidj
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Australian Politics
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Eganstown, via Daylesford, VIC
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gizmo_2655 wrote on Apr 4 th, 2011 at 4:41pm: perceptions_now wrote on Apr 4 th, 2011 at 3:59pm: gizmo_2655 wrote on Apr 4 th, 2011 at 3:28pm: perceptions_now wrote on Apr 4 th, 2011 at 3:16pm: gizmo_2655 wrote on Apr 4 th, 2011 at 2:54pm: perceptions_now wrote on Apr 4 th, 2011 at 2:04pm: gizmo_2655 wrote on Apr 4 th, 2011 at 1:37pm: First off..Chernobyl was a Reactor EXPLOSION, not a Reactor meltdown, so the two cases are entirely DISsimilar.... And secondly, while the c&p'd info is partial accurate, the definition of meltdon is correct, the Guardian's stuff about the material melting through the RPV is, at best, a misquote, and at worst, a complete load of bovine fecal matter. ... You say neither, I say niether - It is believed that for some unknown reason, there was a sudden loss of water that was used to cool 1,661 uranium fuel assemblies that were set in pressure pipes surrounded by 1,700 tons of graphite blocks, causing the fuel rods to overheat. The zirconium alloy around the fuel assemblies, along with the pressure tubing, melted at about 3,500 degrees Fahrenheit, overheating the graphite. The temperature rose still more. At 5,100 degrees Fahrenheit, the uranium-oxide fuel began to melt. The operators flooded the reactor with water. It was too late and the water was instantly turned into a superheated steam, which reacted with the graphite, fuel and zirconium to produce hydrogen, methane, and carbon monoxide. Over many hours, the gases built up and combined with oxygen released by the cracked pressure tubes, triggering a massive explosion. (Barnathan & Strasser 22-23) In any event, forgetting cause & effect, many of the outcomes are similar, in terms of some health problems, but the Fukushima Economic outcomes will clearly be much, much greater! Perhaps not, it depends on who you accept as a valid source of information. I certain don't accept your uncorroberated words! Exactly ....now, the big difference between the Fukushima reactors and Chernobyl #4 is this...Fukushima HAS got RPV's and Containment Vessels...Chernobyl didn't... I understand about Chernobyl....they were running a test on one of the emergency core cooling features (which obviously didn't work) and the temperature spiked....And yes adding water did cause the steam explosions which ruptured the reactor casing... However it didn't take 'hours' for the pressure to blast the casing open... The test started at 1:23:04 am, the automatic systems triggered an emergency shut down (SCRAM) 36 seconds later, and the first explosion was a 'few' seconds after that and the second 3 seconds later..etc.. The fire alarms went off (after the casing ruptured and set fire to the building) at 1:26:03 am...a little under 3 minutes later... Anyway...the point is, none of this has happened in Japan...because we'd sure as hell know by now...AND in the case of Fukushima...even if the reactor casings HAVE ruptured, there are still TWO more levels of containment that must fail before the reactor core is exposed to the air... So, was that you agreeing that I shouldn't take your word, for anything, as you keep changing what you say? So, after the RPV ruptures/cracks/melts, there are still 2 more levels of containment, before the core is exposed?
And, they are what? No that was me saying that there was a power spike which led to the explosion.. Ok, I may have included one too many levels.. There's the concrete and steel containment vessel to hold in any explosions....which Chernobyl didn't have... and, depending on size and design, there's the actual building housing it all......which doesn' necessaily help with but weather.... Now, let's just clarify?
You talked about if the reactor casings HAVE ruptured and you talked about the concrete and steel containment vessel to hold in any explosions.
Are they both not the same as the Reactor Pressure Vessel (RPV), that I raised?
And, in case you haven't noticed, much of the surrounding Concrete & Steel building structure, is no longer there on a few of these Fukushima reactors!
Is that about right? I sort of stuffed up the idea when I said Containment AND RPV... IF the casing HAD ruptured, there'd still be the concrete (and steel?) Secondary Containment Vessel.... I admit the error, I'm not an engineer involved in Reactor construction...Fukushima still has at least one more level of containment around the core than Chernobyl had.. And NONE of the Fukushima reactor Cores are exposed...Same difference though...Chernobyl's reaction chamber core WAS blasted open by the explosions....and NONE of the Fukushima cores have been opened... Japanese withheld information on high radiation at Fukushima April 04, 2011 THE Japanese government withheld the release of data showing that levels of radiation more than 30 kilometers from the crippled Fukushima nuclear plant exceeded safe levels, broadcaster NHK reported Monday citing official documents.
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