Yeah, the design is still broken, they just bandaided it. I'm pro-nuke, but I don't want to be anywhere near an RBMK - or even anywhere downwind. Per Wikipedia, these were the improvements:Russia still has ten RBMK (Chernobyl-type) reactors in operation, retrofitted with additonal safety measures, but still...
That makes me feel so much better. Not.Following Legasov's death all remaining RBMKs were retrofitted with a number of updates for safety. The largest of these updates fixes the RBMK control rod design. Previously the control rods were designed with graphite tips, which when initially inserted into the reactor first speed up the reaction and after that begin slowing or stopping it. This design flaw contributed to the first explosion of the Chernobyl accident.
The updates are:
* An increase in fuel enrichment from 2% to 2.4% to compensate for control rod modifications and the introduction of additional absorbers.
* Manual control rod count increased from 30 to 45.
* 80 additional absorbers inhibit operation at low power, where the RBMK design is most dangerous.
* SCRAM (rapid shut down) sequence reduced from 18 to 12 seconds.
* Precautions against unauthorized access to emergency safety systems.
Since 10pm, per USGS, might be a few minutes before this latest one appears.Just got another warning in the apartment and felt another tremor. I think they said it was magnitude 5 in Fukushima on TV. Getting tired of it.
The aftershocks seem to be hovering around the 6.0 mark per USGS and they don't seem to be diminishing. Never seen anything like it, this is a colossal "WTF" moment just to watch the things scroll in on the USGS site.It was a 6 off the coast of Fukushima apparently, about a 5 on land, about a 3 in Tokyo.
Again, what 70?Sv over what timeframe?Radiation has reduced to 70microsievert according to announcement on news.
The news seems to be saying that's per hour, they just leave it off from time to time. I haven't seen a single media report say 'per second'.Again, what 70?Sv over what timeframe?
70?Sv is less than one head x-ray, and about 3 hours in an airplane. If that's the dose per second it would be really bad. If it's the dose per hour or day it would be pretty good under the circumstances.
Wouldn't be surprised if some jerk mechanic decided to skip the last maintenance/overhaul and just say he did it, figuring that since the plant was closing, nobody'd notice and it wouldn't matter.I wonder if that has anything to do with the failed diesel generators.
Apparently there were four idiots in or near Crescent City, CA who decided to do just that and were swept out to sea.Thankfully, everyone I know is fine, including relatives of some friends in Japan. Hopefully the same can be said about all the FG members effected. Also it seems I assumed correctly that nobody I associate with here in California was among the fucking morons who thought to themselves, HURRRRRRRRRR, tsunami warning! lets go to the beach and see what happens!
Or the plant's owner decided to skip it, saving some bucks. They got a history of downplaying reactor security problems.Wouldn't be surprised if some jerk mechanic decided to skip the last maintenance/overhaul and just say he did it, figuring that since the plant was closing, nobody'd notice and it wouldn't matter.
I read the tsunami affected the site, to what extent i don't know. It's possible that even sediment stirred up could have caused problems (blocked pumps), but I would have thought that those possible outcomes would have been considered. There is a protective wall around the site but the tsunami was on the large side.Or it may have been seawater damage (does anyone know if the facility was swept by the tsunami?).
Also possible. They've also had at least one really strange criticality incident, back in 1999.Or the plant's owner decided to skip it, saving some bucks. They got a history of downplaying reactor security problems.
My own thought is since, as many politicians of all US parties point out, energy independence and security is of paramount importance or even a matter of national security, we should perhaps have the military spec and run nuclear power plants, and lease the resulting output to energy companies. Solves a lot of problems.I think that's one of the reasons for the flawless record of the US Navy you rightly pointed out: They are not under pressure to deliver returns to their shareholders. I'd feel much better about civilan uses of nuclear technology if it would not be use by for-profit entities.
I read the tsunami affected the site, to what extent i don't know. It's possible that even sediment stirred up could have caused problems (blocked pumps), but I would have thought that those possible outcomes would have been considered. There is a protective wall around the site but the tsunami was on the large side.
Apparently there were 13 diesel generators and all failed.
Try my wild speculation out: Earthquake hits, turbine (aka, the generator part of the installation) shuts down and decouples from the reactor due to excessive vibration. Reactor is still getting power from the grid's remaining generation systems, so not a huge deal. A bit later, the tsunami rolls in and grid power goes down. Computers or the operators command the diesels to start - and they suck in water and hydrolock. Assuming they didn't get filled with water by the tsunami to begin with.It's located very close to the seaboard, so... there's a good possibility that the waves may have done some damage to contribute to this event.