[dirtyid]

You're drawing some arbituary point of even more negligible dilution when mathematically, flat out dumping everything straight into Inawashiro is still merely 1% of WHO limit for safe drinking water. It would already be adequately diluted for human health. It's already likely sufficiently negligible considering the ratio of solution:solvent. Spread that over 30/50 or whatever years over water cycles and different locations and it's even less of an issue. It would be bloody diluted regardless, especially so when titrated on multi decade time scale. I'd happily drink it. And I am not being facetious.

Ultimately, regardless of feasibility, it's simply a solution which they didn't even consider, because again, as you recognized why would they. That's politically suicide even if it's deemed ecologically sound plan. Which circles back to your first point, does any country dump tritium in their local lake? Not publically, and Fukushima is notoriously public politics. But you know what most try to do with nuclear waste? They attempt to engineer supremely expensive local storage solutions, and frequently fail only to spend stupid resources to warehouses it domestically, instead of dumping that into the commons. It's 60 olympic swimming pools worth of water. It's trivial storage problem for nation state. Hence problem 1/2/3 isn't even a problem especially if they bothered with local dumping studies which again, is 3 tankers per day for 30 years. It's nothing. Desalinating 1.25m tons is also trivial, and not even that costly. A 10m gallon / day plant cost less than 100M and sort filter that in a month. Which is peanuts versus aggregate clean up cost, and even potential lost fishing revenue. Cost isn't driving this decision to release, politics is. And it's not regional geopolitics because JP isn't releasing this water out of spite for her neighbours. Let's not forget, it's not PRC but most of region as well as countries across the Pacific not pleased with this decision.

Which ultimately circles back to point 4, and my broader point. LOCALs don't like it. LOCALs vote. Can't risk LOCAL votes even if they're irrational, and EVEN worse if their rational distrust of TEPCO becomes reality down the line. IIRC even more containated water already leeched into ground water. Risk of future leaks, however "safe" this water is, and heads will roll. So the politically expedient solution is to dump into ocean and remove any potential risk. The political math is simple, they would never even consider local disposal or long term local storage due to the risks, so into the ocean it goes. Which again, is fine. Fine in the sense that it's a calculated decision. But let's just acknowledge that's whats actually driving decision making. Less science and more domestic JP politics. They didn't have to dump this water. A 5T economy can afford to store it indefintely and ignore geopolitical shit show. But domestic JP politics want that water gone from JP territory, so into the ocean it goes.

[freetime2]

So I agree with your point that it would be heavily opposed by local residents if they tried to dump it in a lake. And yes an elected government is going to be more concerned with keeping their voters happy than than their neighbors who are engaged in opportunistic political posturing. But I don't think this is unique to Japan at all. Look at the pushback that the US got when they tried to bury spent nuclear waste in an uninhabited section of desert [1]. And politicians being beholden to their constituents' demands is a feature of democracy, not a bug.

And also like Prickle says it's all moot because releasing it into the ocean is the better solution - in terms of cost, risk, dilution effectiveness, and political feasibility. Maybe their fishing industry would be impacted less if they dumped it in a lake - although I suspect the effect will be temporary as the global market reconfigures itset, and South Korea already bans fish and agricultural products from Fukushima, and Japan was already headed toward a trade war with China for other geopolitical reasons. There would also be economic impacts as a result of dumping it in Lake Inawashiro - for example to tourism in the Lake Inawashiro area. Is that a good trade-off? I don't think the answer is as obvious as you claim.

And I don't know how you can claim "it's simply a solution which they didn't even consider" - were you there in the room when the engineers were drawing up ways to treat the wastewater before deciding on this one? Honestly I find it perplexing that you are so fixated on this notion that because they didn't choose some suboptimal solution to dispose of waste water, somehow that is emblematic of "Japanese domestic politics at it's worst".

[1] https://en.wikipedia.org/wiki/Yucca_Mountain_nuclear_waste_r...

[dirtyid]

>perplexing that you are so fixated

It was just a retort to OP comment of regional reaction to JP release being geopolitics at it's worst when incentive calculus points to decision to release being JP domestic politics at it's worst (even if it's also politically optimal/expedient). As far as being in room, I don't see how that's relevant. All we have is what has been publicly communicated and it was between aerial release and water, both of which = release into commons, what solution makes to public discourse is as important as what doesn't - the numbers released so far suggest domestic storage/disposal was feasible, but again, that's a politically non-starter. I find it perplexing people can judge what's optimal/suboptimal based on science when this is predominantly a political issue due to domestic and regional trust of TEPCO. The fundmental issue is people, including japanese does not trust TEPCO even with oversight to behave correctly long term. So the politically expedient thing for JP politics to do is dump in commons to avoid potential domestic blowback, because local storage not politically viable option. And natural regional geopolitical response to that would be fishing bans because JP made a potential domestic problem a regional one. How optimal the solution is a function of politics/incentives. In this case one that involves radiation that sensible geopolitical response would be to keep that shit in your borders regardless of cost. Yucca mountain fine example, it's a fucking shitshow but it's still US at least keeping their nuclear waste on domestic soil, it's US gov eating the cost, as they should. But IIT we have useful idiots whose like, punishing said dick move is geopolitics at it's worst.

[Prickle]

It's not arbitrary, and I don't understand why you think it is. It's not even a mathematical issue. At it's core, it has always been an environmental issue.

Fundamentally, the complaint is that the tritium water will cause environmental damage. => And will lead to damage to humans. If we go down to the roots of the issue, it has not, and never was centered around whether the bq/L was below human drinking limits. It has always been about whether the bq/L amount is safe for the environment. That's why I brought up the natural range in the first place. If anything, claims about it being safe to drink have been a distraction brought up to placate protestors. (And it misses the point)

Therefore, the powerplant should be (and has been) required to reduce environmental effects. When it comes to controlling the Catastrophically F'd reactors, they've been less than capable to say the least. But that's not explicitly related to the tritium water we are discussing about right now.

So, the goal should be to minimize environmental damage. In order to better ensure that, the Tritium water should not cause a major change in composition of the water. Therefore, the bq/L of tritium in water, should preferably, not change beyond the naturally expected amount. (ie: 0.4–1.2 bq/L) Hence why I brought up how your solution violates that basic idea, while the sea release does not. I even showed you the very basic napkin math that made me come to that conclusion.

You do realize, one of the other proposed solutions was actually release by air? After all, Tritium is an isotope of Hydrogen. That plan was specifically dropped because the amount of expected tritium per cubic liter of air, would be greater than when released in water. The decision from the start, has been about minimizing the becquerels per cubic liter. Certainly, the government would accept nothing else.

I should point out, the water is more dangerous when stored. By default, the stored water has a significantly higher concentration until it is diluted. Certainly, higher than the safe level. A leak from the tanks would cause significantly more environmental damage. Just like with aircraft design, where every contingency is considered, we must also consider every contingency for when that containment fails. History has shown us multiple times, that inevitably, even the best built systems are destroyed by human error.

Quite frankly, your complaints are more arbitrary than mine. You are proposing that Japan should take the concerns of uninformed individuals, over the concerns and claims made by professionals.

[dirtyid]

No, I'm highlighting professionals, ESPECIALLY policy makers, are politically constrained in what they can recommend/advocate. They are more compromised by default. I'm aware of the release by air solution, and it reinforces my fact that domestic storage/disposal, though expensive, was likely never properly considered, not because of science or viability, but because domestic politics forbids it. Fundamentally, the problem is one of (geo)political trust. No one trusts TEPCO not to fuck up regardless of oversight, hence the actual science is _politically_ irrelevant. When that's the trust baseline, the region would prefer Japan to keep their domestic nuclear mess up as a domestic problem, within their borders either via domestic storage or disposal. JP political incentive is the opposite, they'd rather dump it off into commons to prevent blowback citing good science, when good science is irrelevant because it can be trivially invalidated by conspiracy/coverup, which TEPCO+JP politics name a more iconic duo. Good science isn't causing SKR/PRC residents to panic and stock up salt or reduce fish consumption if JP fish isn't banned to reduce perception of contamination risk. JP politicians did what's optimal/expedient for them and constituents - offload a literal radioactive problem into regional geopolitics. Which is... fine, even if dick move because one would expect wealthy countries with capability to keep these problems domestic despite cost. The original response to OP was to point out that JP domestic politics at its worst is what’s driving regional geopolitics, which is not responding in a vacuum, and political responses not constrained by science, because science is not sufficient without political trust.