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Canada begins Small Modular Reactor strategy roadmap

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Re: Canada begins Small Modular Reactor strategy roadmap

#41

Earlier quoted context omitted.

This is definitely being taken into account. For a quick summary see: https://www.thenakedscientists.com/articles/questions/how-mu...

I really don't think north American nuclear waste costs can be estimated with any fixed ceiling to cost overruns, considering the expensive Fiascos that were WIPP and yucca mountain.

Yucca's issues were political though, a byproduct of democracy.

Re: Canada begins Small Modular Reactor strategy roadmap

#42
post #36

Earlier quoted context omitted.

Please note though that the "forever" timescale becomes harmless for all intents and purposes relatively quickly. So IMHO and I don't really know the cause, this conception we have of nuclear is a really uninformed one. See: https://www.quora.com/How-long-does-nuclear-fallout-last

Maybe it is uninformed, but the media certainly doesn't help in it's coverage of nuclear disasters. Speaking as someone with very little understanding of nuclear physics and energy, how it seems like nuclear power plants are amazing right up until they don't work (see Fukashima, 3 Mile Island, Chernobyl) or the fuel rods are spent. We still don't have long-term nuclear waste storage plans other than cordoning off cer…

I'm not quite sure what your question is with the spent fuel pool. The water will just sit there and slowly evaporate probably or be cleaned and checked for contaminants before going elsewhere. It's really not that much water. I think you're making a problem where there isn't one.

The water keeps it from melting as the spent fuel becomes a little more inert each day (it transfers heat to the water, and as we know radioactive stuff has half lives). After a few years, we can move it to dry storage (incased by concrete and steel).

Re: Canada begins Small Modular Reactor strategy roadmap

#43

What many people is this thread don't realize is that nuclear is by far the cleanest form of energy for the environment. It has no intermittancy problems like Wind and Solar. The process of building nuclear is extremely clean compared to building wind turbines and solar panels which devastate the environment due to the rare metals needed and production process. Its also vastly friendlier for humans and animals. The n…

The process of building nuclear is extremely clean compared to building wind turbines and solar panels which devastate the environment due to the rare metals needed and production process.

Photovoltaic cells can be made with thin film technologies based on rare elements such as gallium, indium, and tellurium. The vast majority are made with crystalline silicon wafers.

Wind turbines can be made with permanent magnet generators incorporating neodymium and dysprosium or terbium. The majority are made with electromagnets, which require no rare metals.

Nuclear, wind, and PV all have drastically lower full-lifecycle GHG emissions and deathprints per terawatt hour than any combustion-based electricity sources. It grieves me that so much "pro-nuclear" advocacy is just renewables-bashing -- and that so much "pro-renewable" advocacy is just nuclear-bashing. (Yes, I agree that nuclear really is safer and much cleaner than fossils.)

Re: Canada begins Small Modular Reactor strategy roadmap

#44

What many people is this thread don't realize is that nuclear is by far the cleanest form of energy for the environment. It has no intermittancy problems like Wind and Solar. The process of building nuclear is extremely clean compared to building wind turbines and solar panels which devastate the environment due to the rare metals needed and production process. Its also vastly friendlier for humans and animals. The n…

In an ideal world it no doubt can be done very well and safely. The thing is ours is a world of owners and the safety of the process is going to be at least partially determined by the people who make the decision on whether guidelines are being met or not. In turn those people are answerable to the owners, are chosen by them and replaceable by them. Now we are talking about micro nuclear? There is nothing about the nuclear power industry that makes me think it is better or different than any other industry. That is where it gets scary for me. Especially in a political era that loves deregulation.

Re: Canada begins Small Modular Reactor strategy roadmap

#45
post #17

Earlier quoted context omitted.

Not really a catch-22: The chicken was supposedly declared safe before it laid those radioactive eggs. And if the designs and siting were subsequently found to be unsafe, why are those reactors re-certified as safe? The nuclear power industry has only itself to blame for costs and safety.

Because the identified issues have been rectified - but the fixes add to the complexity and you are always relying on a fix to make it safe - while newer designs(pebble bed reactors) are inherently safe.

Re "Because the identified issues have been rectified" you mean like the containment buildings at Fuk that did not contain? And what, exactly, can one rectify about unsafe siting?

Re: Canada begins Small Modular Reactor strategy roadmap

#46

Earlier quoted context omitted.

As I said, new technologies might change that assessment, but these technologies are not even on the horizon yet. The problem with nuclear waste, however, very much exists already. And there is no mention that these SMR create less nuclear waste or that they can't be turned into weapons grade material. Certainly even the fissile material in an SMR would be enough for a dirty bomb out of hell. Let alone the material y…

Again you are trying to broad brush the argument as the parent comment has already stated. How do we get better nuclear technology? we iterate on it. SMR are an iteration to solve flaws in the previous versions. A quick wiki search indicates that they are designed to create less waste because of their higher burn-up rates. So yes, technology is on the horizon. Consider changing your assessment. Nuclear waste? Some SM…

Of course distributed SMRs have lesser physical security than bigger facilities. If they had the same level of physical security, costs would increase by a lot and the advantage of being small and distributed in inaccessible areas would diminish.

I don't care about iteration and the promise of eventually getting to something safer, if the intermediate result is accumulating more nuclear waste and poses serious security risks.

Re: Canada begins Small Modular Reactor strategy roadmap

#47

Earlier quoted context omitted.

As I said, new technologies might change that assessment, but these technologies are not even on the horizon yet. The problem with nuclear waste, however, very much exists already. And there is no mention that these SMR create less nuclear waste or that they can't be turned into weapons grade material. Certainly even the fissile material in an SMR would be enough for a dirty bomb out of hell. Let alone the material y…

The ammount of effort required to steal fissile material from multiple reactors, without anyone figuring it out long enough to detonate and being caught, just to make a dirty bomb ? With what estimated impact ?

Good luck trying to track down the thieves if they raid a couple of reactor sites and just disappear. Doubly so if it's somewhere in the wilderness. I don't even think they need to raid more than one SMR to create a pretty nasty dirty bomb...

Estimated impact varies on how much material is in an SMR and how easy it is to take out.

And a raid isn't even technically necessary if an SMR gets into the wrong hands in the first place.

Re: Canada begins Small Modular Reactor strategy roadmap

#48
post #9

Earlier quoted context omitted.

Nuclear accidents happen, yes... at power plants with designs which were outlawed on safety grounds 40 years ago. If you want to prevent nuclear accidents, you should be supporting attempts to build new reactors, because that's the fastest route to getting the old ones decommissioned.

Exactly. It's an almost catch-22 situation: old reactors are unsafe, so people protest building new ones, which would make the old ones obsolete and make the whole technology safer.

Protests don't really prohibit designing and prototyping safer reactors. And many of these designs seem to have a similar problem about nuclear waste.

Again: Solve nuclear waste problem first, before creating ever more nuclear waste.

Re: Canada begins Small Modular Reactor strategy roadmap

#49

At least with the current technology there are too many downsides to nuclear power. The nuclear waste issue still hasn't been solved, and nuclear accidents do happen, apparently despite all the security measures. Small reactors, maybe even mobile, can only make this worse.

AFAIK nuclear has a better track record than fossil fuels or even hydro, as far as accidents go: https://en.wikipedia.org/wiki/Energy_accidents

The potential damage done by nuclear accidents that haven't happened yet, is, however, bigger than anything remotely thinkable with fossil fuels. Even before enemy action is considered.

Re: Canada begins Small Modular Reactor strategy roadmap

#50

Earlier quoted context omitted.

Yes, I actually prefer to keep the nuclear stuff in a limited number of places. That makes supervision a lot easier, and stealing nuclear material a lot harder. Much more, I prefer not adding to the nuclear waste we already don't know how to deal with. Fossil energy is preferable to nuclear, and the volatility of wind or solar energy is much less of a problem than people think. Especially with newer technologies to e…

"we already don't know how to deal with" Yes we do. We store it, until we can use it. And even if we can never use it, which is very unlikely, in the core of the earth is already much, much more radioactive material, so adding a tiny bit to that, is not a big problem "as people think". And as far as I know, there is a great deal of work to be done to upgrade the power grid, for 100% wind/solar. And much more needed s…

And yet, solar and wind energy is on the rise, nuclear isn't.

The radioactive earth core isn't in my backyard, luckily. With nuclear waste, however, it is often stored close to the reactors, with obvious problems, of which limited space isn't the only one.

Somehow a large number of scientists do believe that nuclear waste storage is a really tough problem, and I haven't yet heard from a reliable source that it isn't. Storage facilities have been leaking and collapsing all the time.

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