Skip to comments.Japan: Quake hurt reactors before tsunami: data
Posted on 05/15/2011 7:02:33 AM PDT by TigerLikesRooster
Radiation seen as too high immediately after temblor
Quake hurt reactors before tsunami: data
High radiation readings taken in the No. 1 reactor building the night of March 11 suggest it was the quake rather than the loss of cooling that critically damaged the Fukushima No. 1 power plant, a utility source said Saturday.
The belated disclosure could trigger a review of quake-preparedness at nuclear facilities across the country. Many have been focusing on increasing defenses against tsunami, which knocked out the plant's poorly placed emergency power generators.
On March 11, the nuclear plant shut down automatically just after 2:46 p.m., when the magnitude 9 quake occurred. Within an hour, it was hit by at least two tsunami. The external power supply then shut down, stopping the emergency cooling system from injecting water into the reactor core at 4:36 p.m.
(Excerpt) Read more at search.japantimes.co.jp ...
Well, duh. I suspected from the first that the quake cracked or shifted the foundation which is why the water kept leaking out the bottom.
I think what they are saying is that the ‘data’ now confirms the hypothesis or speculation of many that the quake caused the original leak.
Huh, there must have been something lost in the translation because that doesn't even make sense. It is precisely the lost of cooling that caused the damage, maybe the quake caused the loss of cooling but even that could have been mitigated had the diesels been able to operate within 4 hours of the accident and there wasn't 20 foot of water in the lower levels of the auxiliary and turbine buildings (caused by the tsunami BTW).
"The quake's tremors may have caused damage to the pressure vessel or pipes," the official said.
So cooling may have not been effective, if the vessel and plumbing are all leaking.
It looks like they are finally admitting all three reactor have holes.
Interesting to note that 5 and 6 are not getting much “air time”
How soon before the release the big blow that the MOX fuel reactor melted down... and just when did it do it.
someone asked on one of the threads about the meltdown
TEPCO says fuel pellets fell into the RPV and melted
According to TEPCO...
3 hours after the scram the water is at the top of the fuel.
in another 1 1/2 it is as the bottom of the fuel
and 16 hours after SCRAM full meltdown.
And boy do I remember so many people on these threads on the internet saying they didn’t think that happened.
Now let’s see what they show for Reactor 2 and 3...if they ever release it
And to put this in perspective
“In an accident that has gone out of control, there is without any doubt enough heat generated to melt the steel bottom of the reactor vessel, causing an approximate 200 tons of molten uranium and radioactive fission products (above the melting temperature of uranium oxide, 2500o, or at least that of uranium, 1130o) to pour out onto the concrete floor of the containment building in a puddle with an average depth of about ¼ inch. “
Well that is certainly true but with pumps operating you can still move water enough to prevent boil off in the outer containment. It is absolutely clear they had a LOCA (loss of cooling accident, and initially caused by the quake possibly) but with 20' of water in the auxiliary building and no way to get it out, there was no way to provide alternate heat removal. obviously the overall structures were retaining water and until the H2 explosions, so was the primary containment and torus structures, we know this because they had a pressure control problem. The LOCA may have also been caused by the H2 explosions.
Anyway my only comment was that the statement didn't make much of sense, because the tsunami most certainly was a major contributor to the crisis.
Well this is just the virtual world here. Just think about all those Japanese that were living within 20 to 50 miles of at least one completely melted down reactor for two months, while their Government/Tepco lied about the radiation releases.
It is my opinion that it will have much effect on those people. The type of radiation can be more important than the amount.
I don't think one can reasonably say that the Japanese Government/Tepco lied. They were cautious about speculating until they had further information. That took time.
In Japan, if you make proclamations about an unknown, and you are wrong, you are dealt with very harshly.
Imagine if something like that happened here. Well, it did, kinda. The BP spill at Deepwater Horizon was an example of the government and company lying to cover their safety issues.
That these OLD Japanese nuclear powerplants didn't kill everyone in a 200 mile radius, considering the multiple and (even today) continuous thrashing they took, should be a sign that the Japanese did everything the best they could.
There is a mess, but there is a lot to be learned from cleaning it up.
At this point in time they need to cover all the trenches that have filled with radioactive water with heavy metal shielding. They also need to shield the basements from the higher floors. That corium is slowly coming out. IMHO.