Apple OC
Mar 15, 10:01 PM
I did a little reading and now am a one minute expert... :p
I've read these reactors did auto shut down when the earthquake hit. The problem is that the rods create tremendous persistent heat even after a shutdown, and it is the lack of cooling water that is causing the problem.
Could it be considered a myth that any nuclear reactor can be expected to automatically safely shutdown when power to all safety systems are lost no matter how it is designed?
And who was saying this could not be like Chernobyl??
Chernobyl was 25 years ago and Russia was not very open to outside help ... no matter how bad this escalades ... somehow this will be contained.
I've read these reactors did auto shut down when the earthquake hit. The problem is that the rods create tremendous persistent heat even after a shutdown, and it is the lack of cooling water that is causing the problem.
Could it be considered a myth that any nuclear reactor can be expected to automatically safely shutdown when power to all safety systems are lost no matter how it is designed?
And who was saying this could not be like Chernobyl??
Chernobyl was 25 years ago and Russia was not very open to outside help ... no matter how bad this escalades ... somehow this will be contained.
Liquorpuki
Mar 14, 12:43 AM
Why can't people get away from the concept of a centralized power source, like a coal or nuclear plant or even a wind farm to generate their national needs? I even see arguments that 'we don't have the space' for alternative power. Look at an aerial photo of any city and all you see is miles and miles of dead empty blank rooves. Solar panels or even small wind turbines on every single roof in every city will have people either reducing their reliance on a central power source or even contributing their own electricity to the grid to the point you may not even need a central power source, or maybe just one - which could be a wind farm or a nice clean geothermal plant.
Even with residential solar or turbines, you still need centralized power to cover base load. Geothermal would work if you can could actually find a heat pocket. A windfarm doesn't. All of this is also very expensive and your distributed generation sources are not economically feasible in a lot of cities. You'll never see turbines mounted on roofs in Southern California where the wind barely blows. It'd be a waste of money.
Geothermal. Magma is 24/7.
Geothermal is probably the only renewable that would cover a significant part of base load for a local grid. But it's expensive as hell and it's a gamble. First of all, you're not tapping into Magma. You're trying to find a heat pocket underground. The research costs about 10 million and this is before you even start drilling. Then when you find a site and spend tens of millions of dollars to drill, there's still a 10% chance that there was really nothing there and you just wasted all that money. If there's something there, then you spend more money to build a plant and there's a chance that after 30 years, the heat will run out and your plant will be useless. Geothermal capacity was about 10,000 MW worldwide in 2010. LA alone has a capacity of 6,000 MW. No way is Geothermal going to cover capacity for the whole entire country.
Even with residential solar or turbines, you still need centralized power to cover base load. Geothermal would work if you can could actually find a heat pocket. A windfarm doesn't. All of this is also very expensive and your distributed generation sources are not economically feasible in a lot of cities. You'll never see turbines mounted on roofs in Southern California where the wind barely blows. It'd be a waste of money.
Geothermal. Magma is 24/7.
Geothermal is probably the only renewable that would cover a significant part of base load for a local grid. But it's expensive as hell and it's a gamble. First of all, you're not tapping into Magma. You're trying to find a heat pocket underground. The research costs about 10 million and this is before you even start drilling. Then when you find a site and spend tens of millions of dollars to drill, there's still a 10% chance that there was really nothing there and you just wasted all that money. If there's something there, then you spend more money to build a plant and there's a chance that after 30 years, the heat will run out and your plant will be useless. Geothermal capacity was about 10,000 MW worldwide in 2010. LA alone has a capacity of 6,000 MW. No way is Geothermal going to cover capacity for the whole entire country.
ddtlm
Oct 7, 11:18 AM
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Glass!
May 2, 10:49 AM
Using Google Images as an attack vector has become very popular recently, it's a problem on Windows too (http://www.reddit.com/r/techsupport/comments/gx2i8/google_images_becoming_a_hub_of_virus_activity/).
They're just using the age-old "Your computer has a virus" scareware trick that has been around on Windows for years.
Safari treating zips as safe is very broken, but the user still has to manually open the file and install it, and enter their credit card details... Are the people replying to the threads in the OP really that stupid?
That's fine, but that's not what most fanboys espouse. "THERE ARE NO VIRUSES FOR OS X!!!" is not the same as "There is no malware for OS X," which confuses the uninformed user.
There is malware for every platform -- from Windows to Haiku to Minix, therefore qualifying the difference between malware and viruses is neccessary. For example, this malware for most Unix platforms that will delete your homefolder, you just have to copy it into a text file, give it executable permissions and run it:
#!/bin/sh
rm -rf $HOME/
It's malware, but it sure isn't a virus.
They're just using the age-old "Your computer has a virus" scareware trick that has been around on Windows for years.
Safari treating zips as safe is very broken, but the user still has to manually open the file and install it, and enter their credit card details... Are the people replying to the threads in the OP really that stupid?
That's fine, but that's not what most fanboys espouse. "THERE ARE NO VIRUSES FOR OS X!!!" is not the same as "There is no malware for OS X," which confuses the uninformed user.
There is malware for every platform -- from Windows to Haiku to Minix, therefore qualifying the difference between malware and viruses is neccessary. For example, this malware for most Unix platforms that will delete your homefolder, you just have to copy it into a text file, give it executable permissions and run it:
#!/bin/sh
rm -rf $HOME/
It's malware, but it sure isn't a virus.
gollum
Nov 28, 08:38 AM
I very rarely get dropped calls on AT & T (been with them since LA Cellular)
sinsin07
Apr 9, 04:02 AM
Some us have lifestyles in which we are more than content with the entertainment selection on iOS devices-myself included. I don't have time, not desire to invest in playing games over long periods of time in a sedentary fashion. I play a game when want to clear my mind a bit, or kill time. I don't go invest huge amount of money and make that a goal, because frankly Id rather spend my time in a myriad of other ways. The vast majority of the population share my mindset. iOS devices not being 'HARDCORZ' enough is not going to hurt Apple. That market is shrinking, not expanding.
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Bill McEnaney
Apr 25, 01:27 AM
Well, I am not 100% sure about the non-existence of any given deity, but when it comes to the cobbled-together fairy tale that Christians subscribe to, my certainty-of-BS level goes through the roof. (Jews and Muslims can readily be included as well.)
There a different kinds of certainty: logical certainty and psychological certainty, say. Necessarily, 1 = 1 because 1 != 1 is a self-contradiction. A sound deductive argument proves conclusively that it's conclusion is true. If you affirm the premises of a sound deductive argument while you deny its conclusion, you contradict yourself.
You can be certain, though not absolutely certain, that some scientific theory is true because all your evidence has confirmed it so far. But as I told everyone here, inductive arguments are always inconclusive when they support their conclusions. Although the conclusion may be true, there could always, notice, I say could always be a counter-example to it. A conclusion may be statistically probable enough that you would be unreasonable to doubt it. But probability, at least epistemic probability, is about how strongly an argument's premises support its conclusion if they do support it. Whether you're talking about epistemic probability, statistical probability, or both, some highly probable theories are still false. Given the available evidence, some true theories can be highly improbable. But objectively, a theory's statistical probability is either zero or else it's one. Regardless of degrees of confirmation an argument's conclusion is either true or false. It either conforms to reality or it doesn't conform to reality.
There's merely psychological certainty, too. Imagine that my honorary brother Brian dies. Yes, he's a real person. You show me the death certificate. You show me his tombstone. I see o coroner's report Brian's picture on it. But I delude myself into believing that he's still living. I'm sure he's alive when he is, in fact, dead.
Sydde, I'm sure you don't have merely psychological certainty, the kind of certainty I've described with my hypothetical example about Brian. I don't even know what kind of certainty you have about theistic beliefs you allude to. Yet, if you've misinterpreted some theistic belief, you may only think you're certain that the belief is false.
There a different kinds of certainty: logical certainty and psychological certainty, say. Necessarily, 1 = 1 because 1 != 1 is a self-contradiction. A sound deductive argument proves conclusively that it's conclusion is true. If you affirm the premises of a sound deductive argument while you deny its conclusion, you contradict yourself.
You can be certain, though not absolutely certain, that some scientific theory is true because all your evidence has confirmed it so far. But as I told everyone here, inductive arguments are always inconclusive when they support their conclusions. Although the conclusion may be true, there could always, notice, I say could always be a counter-example to it. A conclusion may be statistically probable enough that you would be unreasonable to doubt it. But probability, at least epistemic probability, is about how strongly an argument's premises support its conclusion if they do support it. Whether you're talking about epistemic probability, statistical probability, or both, some highly probable theories are still false. Given the available evidence, some true theories can be highly improbable. But objectively, a theory's statistical probability is either zero or else it's one. Regardless of degrees of confirmation an argument's conclusion is either true or false. It either conforms to reality or it doesn't conform to reality.
There's merely psychological certainty, too. Imagine that my honorary brother Brian dies. Yes, he's a real person. You show me the death certificate. You show me his tombstone. I see o coroner's report Brian's picture on it. But I delude myself into believing that he's still living. I'm sure he's alive when he is, in fact, dead.
Sydde, I'm sure you don't have merely psychological certainty, the kind of certainty I've described with my hypothetical example about Brian. I don't even know what kind of certainty you have about theistic beliefs you allude to. Yet, if you've misinterpreted some theistic belief, you may only think you're certain that the belief is false.
blackcrayon
May 2, 10:57 AM
Meh... if you're stupid enough to have open safe files checked.
Are you sure that is the end of it, just having safe files checked and this thing installs itself? I'm trying to figure out where this is happening (i tested it myself and all it did was unzip the .zip file, it didn't automatically launch the package installer and then click the Install button for me).
Are you sure that is the end of it, just having safe files checked and this thing installs itself? I'm trying to figure out where this is happening (i tested it myself and all it did was unzip the .zip file, it didn't automatically launch the package installer and then click the Install button for me).
Macist
Feb 26, 05:20 AM
The thing is, do Apple care about being outpaced sales-wise? They may just be content to make their products smoother and sexier than the better Android phones and be the Mercedes.
If they want to be in the sales race they need to get the 32MB iPhone free on �30 per month contract like other top-end smart phones, not �230 on a �35 per month contract. As Android and Maemo and tothers improve that massve Apple tax won't wash.
They also need an iPhone nano to compete with the HTC hero type phones.
If they want to be in the sales race they need to get the 32MB iPhone free on �30 per month contract like other top-end smart phones, not �230 on a �35 per month contract. As Android and Maemo and tothers improve that massve Apple tax won't wash.
They also need an iPhone nano to compete with the HTC hero type phones.
GGJstudios
May 2, 04:44 PM
trying to stick to facts...
OSX marketshare was just shy of 50 mill
That's Mac OS X installed base, not the installed base of Macs, as I said. Mac OS X is not the only Mac OS out there. Reading comprehension is fun!
lol, sorry........I can't get into this but you are SO wrong its not true.
Which means, of course, that you can't back up your claims with facts.
there are governments around the world employing people to do this kind of thing.
So? That has nothing to do with your baseless claims about hackers.
OSX marketshare was just shy of 50 mill
That's Mac OS X installed base, not the installed base of Macs, as I said. Mac OS X is not the only Mac OS out there. Reading comprehension is fun!
lol, sorry........I can't get into this but you are SO wrong its not true.
Which means, of course, that you can't back up your claims with facts.
there are governments around the world employing people to do this kind of thing.
So? That has nothing to do with your baseless claims about hackers.
Full of Win
Mar 18, 10:37 AM
Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_2_1 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8C148 Safari/6533.18.5)
What we need need to do is to use our rights to their maximum amount. If you are on the so-called unlimited plan, download all that you can until you reach 4.5 GB per month (as shown by myAtt.app). Also, download during the day if possible, to cost them even more for peak usage. Leaving data on the table every month is for suckers.
What we need need to do is to use our rights to their maximum amount. If you are on the so-called unlimited plan, download all that you can until you reach 4.5 GB per month (as shown by myAtt.app). Also, download during the day if possible, to cost them even more for peak usage. Leaving data on the table every month is for suckers.
appleguy123
Apr 10, 11:36 AM
Ya know what? This is good advice. After doing a LOT of thinking about this, I realize that I'm probably best off sticking with Windows.
When it comes right down to it, I'm really just "curious" about trying a Mac. I don't actually have a particular reason, and I don't have any problems with Windows (believe it or not).
It looks like both operating systems have a few advantages and both operating systems have their share of annoyances. Truth is, I'm having a hard time finding a real advantage to switching.
If I were starting out today I'd most likely go with a Mac. But I'm an old dude, not a kid. I'm very comfortable with Windows and I really LIKE certain things about it. In fact, the first thing I'd do on a Mac is try to set it up so the Dock works just like the Start button in Windows. A rational person would have realized long ago that this is crazy. If I want a Mac to work like Windows I should just use Windows. Duh. But my curiosity along with the attractive cosmetic looks of the Mac got the best of me.
I won't lie, I'll forever be curious about "the other side"... but in my case I think I'd just be asking for a lot of headaches figuring out how to do all of these things differently than I'm used to.
Anyway...
Thanks to everyone that helped by adding your thoughts, I really appreciate it. And since I can't be the only one out there with similar feelings maybe this thread will help them too. Some will choose to switch to Mac, some will choose to stick with Windows.
And that's the way it goes. :)
You could always buy a Mac and run windows on it. It would let you satisfy your curiosity, and have a safe fallback to the OS you know. And a beautiful computer.
When it comes right down to it, I'm really just "curious" about trying a Mac. I don't actually have a particular reason, and I don't have any problems with Windows (believe it or not).
It looks like both operating systems have a few advantages and both operating systems have their share of annoyances. Truth is, I'm having a hard time finding a real advantage to switching.
If I were starting out today I'd most likely go with a Mac. But I'm an old dude, not a kid. I'm very comfortable with Windows and I really LIKE certain things about it. In fact, the first thing I'd do on a Mac is try to set it up so the Dock works just like the Start button in Windows. A rational person would have realized long ago that this is crazy. If I want a Mac to work like Windows I should just use Windows. Duh. But my curiosity along with the attractive cosmetic looks of the Mac got the best of me.
I won't lie, I'll forever be curious about "the other side"... but in my case I think I'd just be asking for a lot of headaches figuring out how to do all of these things differently than I'm used to.
Anyway...
Thanks to everyone that helped by adding your thoughts, I really appreciate it. And since I can't be the only one out there with similar feelings maybe this thread will help them too. Some will choose to switch to Mac, some will choose to stick with Windows.
And that's the way it goes. :)
You could always buy a Mac and run windows on it. It would let you satisfy your curiosity, and have a safe fallback to the OS you know. And a beautiful computer.
Multimedia
Oct 26, 01:21 AM
MacOSX scales very poorly compared to (say) Linux, Irix, or AIX, owing to its Mach underpinnings. 8 cpus won't get you much over 4 until Apple rips out the Mach guts and replaces it.I don't believe you. I use applications that want 3-4 cores EACH. And I need to run 2-4 of them simultaneously. No way is Apple going to ship dual Clovertowns if they provide no benefit. I think AppliedVisual also does not believe you. In other words:
You may be mistaken.
You may be mistaken.
Spectrum
Aug 29, 03:11 PM
It is a huge difference in getting to know how we can alter the genetical code and actually do it in a grand scale. THAT if anything will be our end.
We've been modifying the genetic code of organisms (plants/animals) for centuries by selective breeding. GM is a more refined way of doing these same things, but more rapidly, as well as permitting the introduction of new genetic traits not possible through standard cross-breeding strategies.
It has the potential to end a great deal of suffering in the world from starvation. Not to mention potentially huge environmental savings from reduced use of pesticides, less irrigation, and transport.
However, this immense power needs to be deployed carefully and responsibly.
We've been modifying the genetic code of organisms (plants/animals) for centuries by selective breeding. GM is a more refined way of doing these same things, but more rapidly, as well as permitting the introduction of new genetic traits not possible through standard cross-breeding strategies.
It has the potential to end a great deal of suffering in the world from starvation. Not to mention potentially huge environmental savings from reduced use of pesticides, less irrigation, and transport.
However, this immense power needs to be deployed carefully and responsibly.
Popeye206
Apr 21, 08:53 AM
Look Android lovers... this is an Apple site. You don't need to call us "Fanboys" in a condescending way here. We are here because we love our Macs, iOS devices or we develop for them and like to keep up on the news. Yes... many here are "fanboys".
We don't care about your customization, your 4G, your ability to steal music or video. It's stupid. You do know you can do all that on an iPhone too (with the exception of 4G - but who cares, very little markets have it). Yes, iTunes manages our music, apps and video, but I can add songs and videos from anywhere... just like you. If I want to be a geek and customize, I can jail break my phone and do all sorts of crazy things. You do realize the average consumer out there could care less right? They just want it to work.
So, anyway... go love your Droid device. It is a nice platform. But sorry to say, it's not going to kill the iPhone or iOS. Apple is good at what it does and consumers love it. Their sales continue to show it.
And, like it or not, Apple is the most influential high-tech company out there right now. They've done more for the PC and the Mobile industry than any other company in the last decade. You should be happy Apple exists as they've woken up many manufactures in the market as to what consumers care about. Quality product. Consistent experience and superior service.
Please... if you want to impress your friends with your customized HTC Thunderbolt, go over to the Android forum and beat your chest and stop the pissing contest here. There's pluses and minuses on both sides and we could argue all day with no productive end result.
We don't care about your customization, your 4G, your ability to steal music or video. It's stupid. You do know you can do all that on an iPhone too (with the exception of 4G - but who cares, very little markets have it). Yes, iTunes manages our music, apps and video, but I can add songs and videos from anywhere... just like you. If I want to be a geek and customize, I can jail break my phone and do all sorts of crazy things. You do realize the average consumer out there could care less right? They just want it to work.
So, anyway... go love your Droid device. It is a nice platform. But sorry to say, it's not going to kill the iPhone or iOS. Apple is good at what it does and consumers love it. Their sales continue to show it.
And, like it or not, Apple is the most influential high-tech company out there right now. They've done more for the PC and the Mobile industry than any other company in the last decade. You should be happy Apple exists as they've woken up many manufactures in the market as to what consumers care about. Quality product. Consistent experience and superior service.
Please... if you want to impress your friends with your customized HTC Thunderbolt, go over to the Android forum and beat your chest and stop the pissing contest here. There's pluses and minuses on both sides and we could argue all day with no productive end result.
bchreng
Apr 10, 01:01 PM
If you are going to buy something to mainly play games on when you are out of the house which one are you going to buy.
Ipod Touch: 230$ USD
Nintendo DS: 130$ USD
PSP: 130$ USD
I think the price of the PSP and DS make them more attractive that and the point they are not an mp3 player that can play touch games.
The iOS devices do not have the hardware that a made for gaming handheld has. a PSP still has better graphics then any iOS game rendered on the spot. The PSP and DS also have a larger advantage...Hard buttons. for real gaming that is a must.
Love how you left out the 3DS for $250. ;)
Ipod Touch: 230$ USD
Nintendo DS: 130$ USD
PSP: 130$ USD
I think the price of the PSP and DS make them more attractive that and the point they are not an mp3 player that can play touch games.
The iOS devices do not have the hardware that a made for gaming handheld has. a PSP still has better graphics then any iOS game rendered on the spot. The PSP and DS also have a larger advantage...Hard buttons. for real gaming that is a must.
Love how you left out the 3DS for $250. ;)
hvfsl
Apr 13, 12:09 PM
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Well I love the new final cut, much better than I expected. I especially like how it sorts out the colour and audio when you import.
But then I am more of a hobbest, I might do the odd wedding or school play which I get paid for, but I generally use it on my holiday videos.
Well I love the new final cut, much better than I expected. I especially like how it sorts out the colour and audio when you import.
But then I am more of a hobbest, I might do the odd wedding or school play which I get paid for, but I generally use it on my holiday videos.
samcraig
Mar 18, 08:24 AM
If you are currently on an unlimited plan, sorry - you can't complain about this new development. You agreed to TOS which stated clearly what you could and could not do with your data. Unlimited data is for PHONE use - not for other devices you can hook up to. ATT and other carrier's bandwidth isn't meant to support as many devices as you want on your unlimited plan.
Now... that being said...
Those who are on a 2gb, or whatever LIMITED plan - should be able to do whatever you want with your data. You've paid for a set allotment - and whether you use that on your phone or elsewhere doesn't matter.
There's a clear distinction between unlimited and capped in terms of what you are ENTITLED to or not.
Now... that being said...
Those who are on a 2gb, or whatever LIMITED plan - should be able to do whatever you want with your data. You've paid for a set allotment - and whether you use that on your phone or elsewhere doesn't matter.
There's a clear distinction between unlimited and capped in terms of what you are ENTITLED to or not.
eah2119
Apr 28, 04:52 PM
The iPad now is definitely just a mobile device. It can't do a lot of things a laptop computer can. Apple's going to have to make some changes to the iPad to give it the title "tablet PC" along with the other "tablet PCs" that think they are "tablet PCs." They will have to make it a little less like iOS and more like Mac OS X. It's just too limited. It's not a computer. It's just a larger iPod Touch.
nebo1ss
Mar 18, 11:47 AM
Hey mates! I live in the UK and according to what I've read, what american mobile companies are charging you is a rip-off! I pay �35 per month (tax included, about $55 USD) and I get: 2000 any network-any time minutes, 5000 same network minutes, 5000 any network messages, UNLIMITED internet, that's right, no capping, no "fair usage policies", UNLIMITED! AAAAND I can tether with up to 5 devices, (macbook and iPad in my case and even my mates iPod touch from time to time when we are out). No extra fees, no hidden tricks. And my iPhone is unlocked, so I can sell it when my contract finishes and any person can use in any country or any network. COMPLAIN PEOPLE!:apple:
Every single UK carrier has a fair use policy. Check again. I agree with you on some points and prefer the UK plans but mainly because they charge different rates for those who own their phone than subsidized phones. I spend six months of the year in the UK and have a 12 month contract plan with o2 where for Sterling 15 or about $22 per month i get 600 minutes, unlimited text and 1g data plus unlimited wifi. I have an unlocked iphone that I use on Tmobile while in the US. I will be changing to "Three" as soon as contract up because they have even more attractive plans.
Every single UK carrier has a fair use policy. Check again. I agree with you on some points and prefer the UK plans but mainly because they charge different rates for those who own their phone than subsidized phones. I spend six months of the year in the UK and have a 12 month contract plan with o2 where for Sterling 15 or about $22 per month i get 600 minutes, unlimited text and 1g data plus unlimited wifi. I have an unlocked iphone that I use on Tmobile while in the US. I will be changing to "Three" as soon as contract up because they have even more attractive plans.
darkplanets
Mar 12, 02:14 PM
While I am not a nuclear engineer, I do have a fair amount of knowledge in the area, so with that in mind I can personally say that this will NOT become another Chernobyl situation. Again though as a disclaimer, this is not my career.
With that said, the BWR should be fine. What we saw earlier was the steam blowing apart the structure-- this just means that they didn't do their job in relieving the pressure. The core should be intact, and the reports state that the housing is still in place. When the control rods are inserted into the core, the rods will not melt down, however heat WILL still be produced. In this case, steam. Steam voids moderate fewer neutrons, causing the power level inside the reactor to lower. Furthermore, there should be safety overpressure valves... not sure why these didn't work; they may not be there due to the age of the plant.
To quote wikipedia about BWR safety:
Because of this effect in BWRs, operating components and safety systems are designed to ensure that no credible scenario can cause a pressure and power increase that exceeds the systems' capability to quickly shutdown the reactor before damage to the fuel or to components containing the reactor coolant can occur. In the limiting case of an ATWS (Anticipated Transient Without Scram) derangement, high neutron power levels (~ 200%) can occur for less than a second, after which actuation of SRVs will cause the pressure to rapidly drop off. Neutronic power will fall to far below nominal power (the range of 30% with the cessation of circulation, and thus, void clearance) even before ARI or SLCS actuation occurs. Thermal power will be barely affected.
In the event of a contingency that disables all of the safety systems, each reactor is surrounded by a containment building consisting of 1.2–2.4 m (4–8 ft) of steel-reinforced, pre-stressed concrete designed to seal off the reactor from the environment.
Again; BWR =/= graphite moderated reactor. Why does no one get this?! Everyone will be fine.
Two more bones of contention (which will give you my perspective):
-I personally believe the linear no threshold model is crap, even with the adjustment factor
-I also personally advocate the use of thorium... there's many benefits, melt-down control being one of them (because of MSR)... also although there's still fabrication issues, thorium can be used in existing LWRs. There is also proposed designs where the thorium has to actively be fed into the core, providing a great shutoff mechanism. The only con to this is the fact that thorium is more radioactive than uranium, so it's potentially more dangerous. I think the pros outweigh the cons.
Do you have a link for this? I'd like to read about it. I would think a system setup to automatically scram when power is lost would be the ideal.
Sure! It's really rather cool. (No pun intended)
For starters here (http://en.wikipedia.org/wiki/Boiling_Water_Reactor_Safety_Systems) is the current safety systems that are supposed to be in all BWR, however since this one is from the 80's, it's really hit or miss-- I can't answer that.
New reactor designs have these systems in place-- for example the Westinghouse AP 1000's. (here (http://www.ap1000.westinghousenuclear.com/ap1000_safety_psrs.html))
A general link about passive safety here (http://en.wikipedia.org/wiki/Passive_nuclear_safety).
Basically though, the idea is that human intervention, mechanical or otherwise, is always the weak point in nuclear safety. Instead of relying upon mechanical or man-controlled means, these safety measures employ the laws of physics and thermodynamics, which I hope are always working :D. Many of these systems rely on heat sensitive plugs connected to tanks to flood the chamber or coolant systems via gravity.
With that said, the BWR should be fine. What we saw earlier was the steam blowing apart the structure-- this just means that they didn't do their job in relieving the pressure. The core should be intact, and the reports state that the housing is still in place. When the control rods are inserted into the core, the rods will not melt down, however heat WILL still be produced. In this case, steam. Steam voids moderate fewer neutrons, causing the power level inside the reactor to lower. Furthermore, there should be safety overpressure valves... not sure why these didn't work; they may not be there due to the age of the plant.
To quote wikipedia about BWR safety:
Because of this effect in BWRs, operating components and safety systems are designed to ensure that no credible scenario can cause a pressure and power increase that exceeds the systems' capability to quickly shutdown the reactor before damage to the fuel or to components containing the reactor coolant can occur. In the limiting case of an ATWS (Anticipated Transient Without Scram) derangement, high neutron power levels (~ 200%) can occur for less than a second, after which actuation of SRVs will cause the pressure to rapidly drop off. Neutronic power will fall to far below nominal power (the range of 30% with the cessation of circulation, and thus, void clearance) even before ARI or SLCS actuation occurs. Thermal power will be barely affected.
In the event of a contingency that disables all of the safety systems, each reactor is surrounded by a containment building consisting of 1.2–2.4 m (4–8 ft) of steel-reinforced, pre-stressed concrete designed to seal off the reactor from the environment.
Again; BWR =/= graphite moderated reactor. Why does no one get this?! Everyone will be fine.
Two more bones of contention (which will give you my perspective):
-I personally believe the linear no threshold model is crap, even with the adjustment factor
-I also personally advocate the use of thorium... there's many benefits, melt-down control being one of them (because of MSR)... also although there's still fabrication issues, thorium can be used in existing LWRs. There is also proposed designs where the thorium has to actively be fed into the core, providing a great shutoff mechanism. The only con to this is the fact that thorium is more radioactive than uranium, so it's potentially more dangerous. I think the pros outweigh the cons.
Do you have a link for this? I'd like to read about it. I would think a system setup to automatically scram when power is lost would be the ideal.
Sure! It's really rather cool. (No pun intended)
For starters here (http://en.wikipedia.org/wiki/Boiling_Water_Reactor_Safety_Systems) is the current safety systems that are supposed to be in all BWR, however since this one is from the 80's, it's really hit or miss-- I can't answer that.
New reactor designs have these systems in place-- for example the Westinghouse AP 1000's. (here (http://www.ap1000.westinghousenuclear.com/ap1000_safety_psrs.html))
A general link about passive safety here (http://en.wikipedia.org/wiki/Passive_nuclear_safety).
Basically though, the idea is that human intervention, mechanical or otherwise, is always the weak point in nuclear safety. Instead of relying upon mechanical or man-controlled means, these safety measures employ the laws of physics and thermodynamics, which I hope are always working :D. Many of these systems rely on heat sensitive plugs connected to tanks to flood the chamber or coolant systems via gravity.
balamw
Apr 9, 03:50 PM
If it's too hot on bare legs, then common sense says, "don't put it on bare legs!" It's so simple, even a cave man could figure it out.
We keep a spare 0.5" 3 ring binder in the family room for the rare time when using the MacBook is potentially uncomfortable.
99% of the time, e.g. couch surfing, it doesn't get hot at all. When it can, e.g. gaming, you have plenty of warning before it really starts getting warm (the fans start balring, etc...) to reach for a barrier.
Most, if not all, notebooks from all vendors suggest not using the notebook on anything other than a hard surface like a desk or table. Do not use in bed, on a sofa, couch, rug or bare legs. A lot of that has to do with blocking the vents they rely on for air cooling.
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We keep a spare 0.5" 3 ring binder in the family room for the rare time when using the MacBook is potentially uncomfortable.
99% of the time, e.g. couch surfing, it doesn't get hot at all. When it can, e.g. gaming, you have plenty of warning before it really starts getting warm (the fans start balring, etc...) to reach for a barrier.
Most, if not all, notebooks from all vendors suggest not using the notebook on anything other than a hard surface like a desk or table. Do not use in bed, on a sofa, couch, rug or bare legs. A lot of that has to do with blocking the vents they rely on for air cooling.
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beret9987
Nov 12, 03:09 PM
Add me to the unhappy list. Granted me I'm in California, a place where AT&T data services are notorious for not working that well. I'm currently on Sprint and quite happy. Shame the iPhone is only limited to one network in the US though.
I'mAMac
Aug 29, 02:57 PM
if anyone was wondering, Stem cells have the remarkable potential to develop into many different cell types in the body. Serving as a sort of repair system for the body, they can theoretically divide without limit to replenish other cells as long as the person or animal is still alive. When a stem cell divides, each new cell has the potential to either remain a stem cell or become another type of cell with a more specialized function, such as a muscle cell, a red blood cell, or a brain cell. wow stem cells are a life saver :)
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