Another danger

It’s a little surprising to read in the New York Times that it’s not only the Japanese reactors which are the source of danger, but the cooling pools around them too:

The pools, which sit on the top level of the reactor buildings and keep spent fuel submerged in water, have lost their cooling systems and the Japanese have been unable to take emergency steps because of the multiplying crises.

By late Tuesday, the water meant to cool spent fuel rods in the No. 4 reactor was boiling, Japan’s nuclear watchdog said. If the water evaporates and the rods run dry, they could overheat and catch fire, potentially spreading radioactive materials in dangerous clouds. …

The pools are a worry at the stricken reactors at the Fukushima Daiichi plant because at least two of the reactors have lost their roofs in explosions, exposing the spent fuel pools to the atmosphere. By contrast, reactors have strong containment vessels that stand a better chance of bottling up radiation from a meltdown of the fuel in the reactor core.

If any of the spent fuel rods in the pools do indeed catch fire, nuclear experts say, the high heat would loft the radiation in clouds that would spread the radioactivity.

“It’s worse than a meltdown,” said David A. Lochbaum, a nuclear engineer at the Union of Concerned Scientists who worked as an instructor on the kinds of General Electric reactors used in Japan. “The reactor is inside thick walls, and the spent fuel of Reactors 1 and 3 is out in the open.”

More on passive safety in nuclear reactors

I just found this at Technology Review (talking initially about the Japanese reactors):

The reactors at the nuclear plant, built in the early 1970s, rely on active cooling systems that require electricity. Newer plant designs would lessen or eliminate the need for active cooling, making use of natural convection or a "gravity feed" system to cool reactors in the event of an emergency.

In one design, for example, the relatively new Westinghouse AP1000, water is suspended over the reactor housing. If pressure within the system drops, this allows the water to fall into the reactor area, submerging it in enough water to keep it cool.

While passive systems could be better in the event of electrical failures, they might not always be the safest systems. Kadak says that in an active system, it's easier to ensure that coolant gets exactly where it needs to be—it's simply pumped to the right location. Designing passive systems, on the other hand, requires complex models of how fluids will behave in a system that could be rendered incorrect if the system is damaged.

Kadak says that even more advanced reactor designs could overcome these issues. Some advanced reactors use molten metals to cool the reactor—the mass of these systems is enough to provide cooling in an emergency, he says, although if the molten metal were displaced by an earthquake, that could be a problem of its own. He's devoted much of his career to another advanced alternative, the "pebble bed reactor," which is designed to make it impossible for the fuel to get hot enough for a meltdown. The tradeoff is that the reactor has to be much larger--for a given amount of power--than a conventional reactor.

Life's too short...

....to spend too much time abusing other internet identities.

But it has to be said - I've been wanting to say it here for so long - Catallaxy has the largest collection of obnoxious, immature, misogynistic, unreasonable, dishonest, disingenuous, lazy, dumb, gullible, un-insightful, self absorbed, uncharitable, childish, abusive, detached from reality, unpleasant, unscientific, selfish, tribal, repetitive, hypocritical, pedantic, tedious, psychologically unbalanced, and flat out wrong collection of commenters in all of the Australian blogosphere.

They are free to choose which adjective goes with which of them. Most there deserve more than one epithet. This is no shock to them - most have been told at their own blog many times.

Now, to resume normal blogging....

Update: some mis-spellings corrected, although epitaph for epithet might be explained as a Freudian slip.

Huh. Scientists can really can sound like Sheldon

I normally really like James Empty Blog, run by climate scientist James Annan and his wife Jules, both of whom are living in Japan (near Tokyo.)

But I can't quite get around the tone of their posts regarding the Japanese earthquake. The first was by Jules who noted she had a "pleasant earthquake" in a new building that suffered no damage.

The next was headed "Earthquake fun" by James, talking about having to walk along the train track after the train he was on stopped short of the station.

Then came "Mildly Inconvenienced" by James, confirming that they were not suffering at all really.

Next, a series of pretty sunset photos.

And then, a post "Don't Panic", complaining that there is too much media hype (I think about the nuclear problems and the effects of the earthquake in Tokyo) and ending with:

Come on people, get a grip. It's an inconvenience. It is not, by any stretch of the imagination, a catastrophe down here, and the best thing most people can do is to get back to normality as quickly as possible. Turn off the wall-to-wall disaster porn on TV and have a look out of the window. It's a beautiful spring day and the cherries are starting to blossom.

I actually then sent a comment saying, in effect, that I like their blog and doubt that they really meaning to sound this way, but they were doing a very good job of sounding like they were completely insensitive to major human suffering happening just down the road, so to speak.

It must have sounded harsher than that, because it has not come out of moderation.

But they have let a couple of other comments through of similar effect.

I'm sorry, but this is weird. More than 10,000 of your neighbors have suddenly died and nearly all of your neighbors will suffer economic consequences well into the future. While the nuclear threat ight be overstated, it is certainly plausible. yet you wax indignant about "hype".

I agree. And as far as disaster porn is concerned, you can hardly expect a still evolving, unprecedented type of disaster in Japan with that amount of loss of life and property damage to not have blanket coverage.

My message to the Annans: you're probably not Sheldon-like scientists incapable of normal human empathy for suffering that is happening not all that far from where you live.

But if you keep making cheery posts making light of how a nearby disaster has not affected you, you're sure doing a damn fine job of sounding like insensitive arses.

Word games

After admitting on Insiders that Tony Abbott uses weasel words on climate change, so that his position of spending billions of dollars to attempt to match Labor’s target for CO2 reduction is somehow “sellable” to climate change skeptics/deniers, Andrew Bolt today tries to make out a case  that when other journalists/commentators say effectively the same thing, they are “verballing” him.  (OK, maybe Combet is to a degree by use of “denier”, but Lenore Taylor – I’m not accepting that she is at all.)

Passive safety in nuclear design

Long term readers of this blog would know that I used to follow with much interest the development of pebble bed reactors - in particular in the development program South Africa had going until they ran out of money. (Use the "search this blog" bar at the side for "pebble bed reactors" and you'll find lots of past posts.)

The big attraction of the pebble bed was its (claimed) passive safety features. As the Wikipedia article on pebble bed reactors notes (although it does sound like it has been written by a strong proponent of pebble beds):

When the nuclear fuel increases in temperature, the rapid motion of the atoms in the fuel causes an effect known as Doppler broadening. The fuel then sees a wider range of relative neutron speeds. U²³⁸, which forms the bulk of the uranium in the reactor, is much more likely to absorb fast or epithermal neutrons at higher temperatures. [2] This reduces the number of neutrons available to cause fission, and reduces the power of the reactor. Doppler broadening therefore creates a negative feedback because as fuel temperature increases, reactor power decreases. All reactors have reactivity feedback mechanisms, but the pebble bed reactor is designed so that this effect is very strong and does not depend on any kind of machinery or moving parts. Because of this, its passive cooling, and because the pebble bed reactor is designed for higher temperatures, the pebble bed reactor can passively reduce to a safe power level in an accident scenario. This is the main passive safety feature of the pebble bed reactor, and it makes the pebble bed design (as well as other very high temperature reactors) unique from conventional light water reactors which require active safety controls.

The reactor is cooled by an inert, fireproof gas, so it cannot have a steam explosion as a light-water reactor can. The coolant has no phase transitions—it starts as a gas and remains a gas. Similarly, the moderator is solid carbon, it does not act as a coolant, move, or have phase transitions (i.e., between liquid and gas) as the light water in conventional reactors does.

A pebble-bed reactor thus can have all of its supporting machinery fail, and the reactor will not crack, melt, explode or spew hazardous wastes. It simply goes up to a designed "idle" temperature, and stays there. In that state, the reactor vessel radiates heat, but the vessel and fuel spheres remain intact and undamaged. The machinery can be repaired or the fuel can be removed. These safety features were tested (and filmed) with the German AVR reactor.^[6]. All the control rods were removed, and the coolant flow was halted. Afterward, the fuel balls were sampled and examined for damage and there was none.

Wikipedia has a short article on passive safety design in nuclear reactors generally, noting that there are some designs using liquid metals as a heat sink for passive safety. Somehow, I can't help but think that using liquid metal just doesn't sound as passively safe as a gas cooled pebble bed.

In any event, surely recent events show that the goal of passive safety deserves to be a major component of future nuclear design.

Back to Australian politics

It feels a little early to go back to speaking about anything other than the death and destruction in Japan, but I’ll briefly note some recent political commentary about Australia that seems about right:

* Annabel Crabb wrote on Friday:

Let's look at the basics here.

Labor's problem is one of trust and consistency.

Political advocacy is about believing something, and setting out to bring a majority around to your point of view. In the best political advocates, principle and determination work together to the extent that even voters who fundamentally disagree with their position on a particular policy stance will grudgingly support them anyway.

Federal Labor is a long way from that right now, thanks to the messages it has sent out to the electorate on a number of issues.

Sounds about right to me. As I was arguing elsewhere on the weekend, with climate change policy in particular, it doesn't seem to be a case (unlike in the Coalition) where actual scepticism of the science has any real sway in Labor (if there were any strong private sceptics in the party room, I am betting we would have heard about it from Rudd aligned leakers during the last election campaign), but rather it just seemed to be lack of will to take on a populist campaign.

While I think there is some under-appreciated value in the way Gillard has announced the intention to have the carbon price in place before the details are worked out (it gives the “Ju-Liar” factor a longer time to burn out before an election,) what was the sense in announcing Tim Flannery was going to be paid to convince Australians of the need for a carbon price only a week or two before announcing we were getting one in a year's time anyway? And whoever thought that it was a good look to have two podiums at the announcement, making Bob Brown look like a co-Prime Minister, won’t be making that mistake again, I bet.

There has been something a bit screwy going on about how policy is made and announced in Labor ever since Kevin Rudd got elected, and it still seems kind of hard for the media to pin down exactly whose fault it has been.

Still, on climate change policy I remain as appalled as ever that Tony Abbott got the leadership on the back of a substantial number of climate change sceptics in the party room who (I am betting) get their science from reading Andrew Bolt.

Speaking of Andrew Bolt, I was a bit surprised to see that even he acknowledged on Insiders yesterday that Abbott uses weasel words on the science which the climate change deniers in the Party can interpret so as to give “plausible deniality” to the idea that Tony might really take climate scientists seriously. Look at his words on Friday after Minchin said warming wasn’t happening:

Climate change does happen, mankind does make a contribution…

As Bolt said, you can easily interpret this to mean that the contribution is absolutely minimal compared to natural forces.

And look at the answers he gave to a series of on-line questions from climate change denying skeptics on Thursday. One of them brings up the “but a carbon tax by Australia it won’t affect the world’s temperature at all” line, as well as giving a spray about how all of climate science is completely corrupt, and Abbott comments:

Good point. People shouldn’t act out of mere environmental vanity

Well what exactly is the point of your plan to match Labor CO2 reduction targets by spending billions of taxpayer dollars, young Tony?

Journalists do know how inconsistent and willing to court climate change denial Abbott has been; I think they just tire of pointing it out all the time because they have bad poll numbers of Labor to talk about instead.

* But going back to Labor’s problems, David Penberthy wrote recently:

The best thing Gillard could do right now is to start a policy fight with the Greens – go and visit Olympic Dam perhaps and come out behind BHP’s push to expand its uranium exports – just to remind them and the voters that she’s the Prime Minister and is running the show. It’s not like Bob Brown is going to pack his bags and go and sit with Tony Abbott. On the current polling the alliance between Gillard and Brown is paving the way for an Abbott Government anyway.

I think that's probably right, although nuclear power is going to have a public image problem until we see how the Japanese post earthquake crisis evolves.

Japan on our minds

There is some anxiety in our house at the moment about the inability to contact some relatives in the earthquake affected areas of northern Honshu. One in particular works in one of the tsunami affected towns, quite close to the waterfront.

In the meantime, the best commentary on the Japanese character and its response to natural disasters I have read is by Nicholas Kristoff in the New York Times. It is well worth a read.

Update: an email came through this afternoon that the people we were most worried about are OK, but there’s still a couple of others about whom we have not yet heard. They would not have been close to the water, however, so we trust they are OK.

Update 2: of course there are heaps of videos being put up on Youtube, but I haven't yet spotted the remarkable seaside town destruction footage that I was watching on TV earlier tonight. But Boing Boing had this video up, showing some very unnatural looking behaviour by some Tokyo buildings:

Actually, I see that a couple of million people have watched this version of the video on Youtube (because it has the link from Boing Boing), but only 5,000 or so have watched the original, uncropped version which the guy also has up on his Youtube account. I actually find the original more interesting, as you get to see other people on the street watching the sway:

Update 3:

I don't want to turn this into disaster porn, but the video below is similar to th longer one I mentioned above that I saw on TV earlier tonight. It does get a bit upsetting when it turns briefly to the scared child and shocked adults watching from their safe point:



Update 4: Let's hope he's wrong, but a UK geophysicist is quoted at the Nature web site saying this:

"Although certainly very big, today's quake was not totally unexpected," says John McCloskey, a geophysicist at the University of Ulster in Coleraine, UK. "Technically, it was in fact an aftershock of the weaker quake earlier in the week — even though it may sound odd that an aftershock can be stronger than the main shock." ...

"The previous quake, although much smaller, significantly increased stress in the fraction of the fault zone that ruptured today," says McCloskey.

The sequence of quakes has probably also affected the stress field further south along the fault zone, critically increasing the earthquake risk in the Tokyo region, he says.

"There is a strong interaction of quakes along a subduction zone, and we can certainly expect a number of major aftershocks in the next weeks," he says. "Some may be as large as, or even stronger than, the quake that last month devastated Christchurch in New Zealand. And chances are that another very large shock could occur to the south near Tokyo."

My apologies for worrying reader Geoff, who's due to fly into Tokyo soon.

Count me as a skeptic...

...when it comes to the Zero Carbon Australia plan that says Australia could be powered by renewable energy by 2020:

Our research was undertaken with two explicit parameters: energy technologies selected had to be both commercially available and from carbon-free renewable energy sources. This explains why the ZCA Plan identifies a 60/40 mix of concentrated solar thermal (CST) power and large-scale wind developments as the backbone of a decarbonised energy system. Together with existing hydropower, investment in CST with molten salt storage, backup from a small percentage of biomass power, an upgraded electricity grid, and comprehensive energy efficiency measures, Australia can reliably meet its energy needs from renewable electricity generation. The technologies selected were not preordained; rather they were chosen on the basis that they worked within ZCA’s parameters.

The ZCA scenario also includes natural gas. Under the plan, Australia would use existing gas infrastructure in a staged scale-back, until the last gas power plants are mothballed in 2020. The most carbon-intensive coal power plants must be first to be decommissioned as large-scale renewables come online, made possible by the deployment of CST power towers with molten salt storage for 24-h operation.

Brave New Climate has been critical of this plan before. Here's one post about it, but there are others.

Too big for my backyard

Time Magazine has a story on the newly retired space shuttle Discovery: it spent a total of a year in space; was the shuttle that delivered the Hubble Space Telescope; and first flew in 1983: a long time in aviation terms, let alone a space plane. (In fact, it's kind of surprising that it handles the vibration of repeated launches so well, isn't it?)

Here's something I didn't know from the story; there are twin astronauts:

The [next] mission will be commanded by the husband of wounded Rep. Gabrielle Giffords, Mark Kelly. His identical twin brother Scott is currently the skipper of the space station; he returns to Earth next week on a Russian Soyuz spacecraft.

The New York Times wrote about where the retired shuttles will end up. There is hot competition amongst various museums, but it seems the Smithsonian is sure to get one.

The Kennedy Space Centre wants one too. I reckon they'll need it, as the tourist value of that place while there's a big gap in developing a new manned rocket will likely diminish.

Higher water

Real Climate talks about the recent finding that some Antarctic ice freezes from the bottom, but also notes the big picture with ice melt:

....there is a new assessment of the net mass balance of Antarctica and Greenland. Rignot et al have updated results, including those from the GRACE gravity measurement satellite, to the end of 2010 and show that the downward trend in ice mass is continuing (stronger in Greenland than in Antarctica). The net rise in sea level associated with this decline is about 1.3 mm/yr, which will likely accelerate with further warming. Complementary analyses of the surface mass balance of Greenland (Tedesco et al, 2011) also show that 2010 was a record year for melt area extent.

This rate of melting is more than was figured into the tabulated IPCC AR4 estimates of sea level rise, and any further acceleration will obviously make the discrepancy worse. Indeed, even in the highest forcing A1F1 scenario, the IPCC calculated only a 0.3 mm/year contribution from the ice sheets averaged over the whole 21st Century! This was clearly a gross underestimate.

Extrapolating these melt rates forward to 2050, “the cumulative loss could raise sea level by 15 cm by 2050″ for a total of 32 cm (adding in 8 cm from glacial ice caps and 9 cm from thermal expansion) – a number very close to the best estimate of Vermeer & Rahmstorf (2009), derived by linking the observed rate of sea level rise to the observed warming.

The Song of the Mice

Physorg notes that there is research going on about how mice sing (ultrasonically):

Whether or not mouse song involves learning either through auditory imitation or behavioral feedback (e.g., from the mother)... is a subject of hot debate, and the answer is proving elusive. To highlight the difficulties facing researchers, two studies published on March 9, 2011 in the open-access journal PLoS ONE have come to differing conclusions about whether mouse vocalization patterns are innate or learned.

Rodents sing and they laugh. Sound like good company, really.

The problems with politics

On the Labor side, this announcement yesterday of a new regime of requiring businesses to report on gender equality issues feels like a real blast from the past, as I seem to recall that 1980's Labor used to like grand gender based social engineering ideas too:

Under the changes announced on Wednesday, companies with more than 100 staff will be required to report on how many workers are female and how their conditions compare to male employees.

Spot checks will also be carried out, with non-compliant businesses to be shut out of government-funded grants and industry assistance programs.

Wasn't there a time when the Howard government actually seemed to be achieving more (or just as much) in terms of women members of Parliament than Labor with all their Emily's List activism?

At least it has the benefit of putting Labor back in the grand tradition of being the time wasting bureaucracy party. It had been slipping in that regard in the last few years.

On the other hand, there's a brief history of the Liberal Party and its attitude to greenhouse gases in The Age today, which also shows the Coalition has taken a strong turn to the past since the Abbott ascendancy.

I remain unhappy with both sides of politics.

Hot places

There’s a short meteorology article out talking about the hottest places on Earth. Turns out that desert temperatures can be higher than I ever realised:

The Lut Desert, located in southeast Iran has long been regarded as one of the hottest places on Earth. Numerous studies have examined the relationship between the expression of severe thermal temperature across this hyper-arid landscape and the unique natural physical characteristics of the Lut, such as the wind-sculpted mega-yardangs, and the vast areas of closely packed rock fragments known as desert pavement (Alavipanah 2007; Azizi et al. 2007). The Lut Desert was determined to be the hottest spot on Earth in two of three years previously evaluated with the Aqua/MODIS satellite LST data (Mildrexler et al. 2006). Here we found that the Lut Desert had the highest surface temperature on Earth in 2004 (68.0°C; 154.4°F), 2005 (70.7°C;159.3°F), 2006 (68.5°C; 155.3°F), 2007 (69.0°C; 156.2°F) and 2009 (68.6°C; 155.5°F), five of the seven years analyzed in this study. The Lut is the only place on Earth to have a surface temperature above 70°C (158°F) and regularly has the largest, contiguous area of surface temperatures above 65°C of anywhere on Earth (Fig. 2).

But then the paper has a local surprise:

In 2003 a scorching temperature of 69.3°C (156.7°F), the second highest temperature of the seven-year dataset, was detected in the province of Queensland, Australia. Australia is the driest inhabited continent on Earth with vast arid lands where annual maximum LSTs routinely exceed 60°C.

So, Queensland has recently had a temperature just a fraction under 70 degrees. Amazing.

UPDATE: my bad. As noted in the comment, the article is not talking about air temperature, the hottest measured record of which still seems to be 58 degrees in Libya. I thought that the article was talking about desert air temperatures measured by satellite, but it is talking about "skin temperature", which can be way higher than the air temperature.

Well, that explains why the temperatures seemed extraordinarily high to me. Must not post so quickly.

A brief observation about Charlie Sheen..

Given that he appears to need to smoke continuously during his web appearances, he's quite the gift for the anti-smoking campaigners of the world.

* his last broadcast - hopefully the last broadcast ever - can be viewed here, if you really need to watch a man going insane.