Appropriations Bill Threatens Future Space Science Missions
ColdWetDog writes "A brief story in the Atlantic notes that the U.S. Senate's energy appropriations bill has failed to supply funds to continue Plutonium-238 production, needed for radioisotope generators for NASA's interplanetary probe programs. No PU-238 means no more missions like Cassini-Huygens, or ones that go places where solar cells won't produce enough power. The article notes that the only other source of PU-238 is Russia — either through the government or through trolling through Siberia and the Russian coastline looking for old Soviet Era lighthouses and power stations."
1st reply to dr trollbob!
way to fail science yet again Dr Bob, probably no less than 3 times in this one post!
NASA is toast. No politician wants to say it out loud, but they've been setting this up for some time now. The space race is over and they've been scrapping various parts of NASA for the last few years now.
SJW: Someone who has run out of real oppression, and has to fake it.
Not a problem. We'll just rely on the Russians just like with manned access to the ISS. What could possibly go wrong?
That means no more Explosive Space Modulators for Marvin to use to threaten to blow Earth away!
In Soviet Russia, plutonium trolls you!
Why is this a bad thing? Plutonium is one of the most toxic subtances known. If a spacecraft carrying this stuff blew up after lift-off, the resulting radioactive debris field could be massive. That could potentially shower millions of people with radioactive dust. It would be in our clothes, in our eyes and, worst of all, inhaled into our lungs.
Sorry to reply to such an obvious troll, but the point is worth discussing. Pu is a really nasty poison - but then so is hydrazine. Rockets have some nasty stuff. However, a chunk of Pu metal isn't such a hazard - it becomes so toxic when reduced to dust.
Spacecraft carrying RTGs are designed with this hazard in mind (as well as the danger of "roll up") and if the rocket should explode the RTG system is designed to fall from any alitiude and remain a solid lump of Pu.
Socialism: a lie told by totalitarians and believed by fools.
At the moment, it still costs more to produce very very large solar panels to produce the amount of power needed for these spacecraft. Not only that, but if you account for the extra weight added to the craft from them, it would cost more in the long run to put those into orbit. Hopefully this will change in the next decade, but its still a problem. (Also the fact that a lot of the elements needed for solar cells like that come from places not too friendly to us at the moment. (eg China.) Sometimes I wonder. Cut budgets to spend more money in the long term. People do not seem to ever take the long range plans into account.
The magic invisible hand will save us by hiring the Russians and the Chinese to look after our interests. What could possibly go wrong?
Paranoia is a Survival Trait!
well according to star trek at least... only about 50 years left until first contact
Never antropomorphize computers, they do not like that
I'm sure they'd trade fox a box of old pinball parts
Democrat anti-nooks have been trying to end NASA's Pu238 RTG use for decades.
Leave space to the Chinese. They don't tolerate anti-nooks.
Aside from the fact that the amount of plutonium involved would be so fantastically small that you couldn't detect it. (Scatter a few grams of anything over a few hundred square kilometers and the concentration really isn't that much.) You probably breath in a thousand times as much radioactive material as an entire decay-powered generator has every time you enter a city with a coal power plant. Further, most US cities have incredibly high levels of legal non-radioisotope carcinogens in the atmosphere from other sources. Besides, it certainly doesn't cost billions of dollars to make plutonium. It comes for free whenever you operate any of the older nuclear power stations.
It's a small world and it smells funny; I'd buy another if it wasn't for the money; Take back what I paid (SoM)
Many short-lived isotopes are in short supply. There's very limited US tritium production, medical radioisotopes production is so limited that there are medical shortages, and there are fewer research reactors operating. Transmutation is almost a dying technology.
Most of the radioisotopes were made in facilities built for bomb programs. Both the US and the USSR now have far too much bomb-grade PU-239, which has a half-life of 24,000 years. The giant nuclear facilities of the Cold War are mostly idle, or are hazardous waste sites.
The smaller nuclear powers are mostly separating uranium isotopes, which today is a centrifuge operation carried out in plants of modest size. The old gaseous diffusion plants were huge - square miles of plant.
How about we cut more money in the short term, so we can spend more in the long term? Plus we don't have to do anything, lets provide money to people who don't care about us too much and get what we need in return.
Price raising? Bah, who cares about that. Nobody likes science anyways.
Florida and Texas, not exactly bastions of Democrat support.
So I guess we could find any reason to support any outcome.
It is far simpler than that, NASA does not generate sufficient votes and every dollar is now too precious to "waste" on science when it could buy votes. Sorry for being cynical but you sometimes cannot help it when you watch what they do
* Winners compare their achievements to their goals, losers compare theirs to that of others.
So let's see, SSC canceled but that was a while ago. James Webb Telescope on the chopping block, probably gone. Tevatron closing (and yes, the Tevatron does a lot of work that can't be done at the LHC. It uses lower energy but a different set of collision types). And now this. At this point it really seems like the US is just giving up at doing interesting science when it has anything like a big price tag where a big price tag means a price tag that is a tiny fraction of the military budget.
Some pie in the sky 8 BILLION DOLLARS so a few hippie uglies can jump up and down for a few seconds 20 years from now is not in my plan !!
They'll have plenty soon.
From what I understand, all the Pu238 really does is generate heat, which is used to power spacecraft. Aren't there designs for tiny fission reactors which will accomplish the same thing using enriched Uranium (of which we have plenty)? Wouldn't this be an excellent substitute? I don't think it's a safety issue: If they blow up on launch, it's still less radiation spilled than Pu238 logs that we use now, and if they melt down in deep space, it's not our problem.
What am I missing?
Bob you're good, you almost got me to reply taking you seriously!
Yes, the Russians have been using these mini-reactors on some of their missions.
http://www.space4peace.org/ianus/npsm2.htm#2_2_1
Complexity and weight. A radioisotope thermal generator has exactly zero moving parts. It is almost literally a sphere of nuclear unstable metal, surrounded by some thermocouples. You really can't get much simpler and hardy than that.
Has anyone here ever even considered the risks of sending a NUCLEAR REACTOR through the Earth's atmosphere on a rocket? What's the failure rate for rockets, 10%? That's a ten percent chance of spewing radioactivity all over the planet, totally unacceptable. Perhaps acceptable to teabaggers and other "America Firsters", but the rest of the sane population of the planet thinks differently. You can't differentiate between military application and those capabilities which are civil and commercial in nature. Nuclear anything is bad, according to leading environmental and climate change scientists (fully accredited with Ph.D's and serving as professors at elite universities, mind you). Don't forget that October 1-8 is "Keep Space for Peace Week".
Remember the 1989 launch of Galileo? The military-industrial complex made the decision for you, that such a horrible risk was "acceptable" and went through with launching a plutonium reactor through the biosphere even though dedicated, lifelong environmentalists evaluated the risk as unacceptable. There were those who bravely stood in protest of Galileo, but the American mainstream (i.e. right-wing) media portrayed the heroes as misguided idiots...just like today. Julian Assange, who has become such a big name due to his courageous work with Wiki Leaks, was moved enough by the campaign against the Galileo launch to feature it in the first chapter of his book.. Let's face it, if you're against WikiLeaks, you're pretty much a teabagger, or an anti-intellectual. How else do you justify disagreeing?
Protect the planet, no nukes in space! Again, this is an accredited opinion, backed by the best and most well-funded environmental NGOs, as well as university professors all across academia. The people on the other side of the argument are on the side of the Pentagon. Geekdom typically ignores its responsibilities to the planet in favor of "OOH, SHINY!" or the discredited triumphalism of the Apollo landings. All it takes is a "natural 1" on a d20 and the planet is fucked, permanently. What say you, geeks? Those of you on the political right may excuse yourselves from replying, as your opinions have already been pre-discredited by The Smart People in our society.
Shutting down free speech with violence isn't fighting fascism. It IS fascism!
Even enriched uranium has far too long a half-life to make it useful enough to lug its weight around.
That said, other isotopes might work just as well, but those would have to be made, too.
--PM
Yeah, he's sneaky. First time I saw him, I actually had an angry rant up DEFENDING him of all the things, and then I actually stopped and reread his post and the one ripping into him and said, "Hey... wait a second..."
World class troll, that one. World class.
Support the EFF and Creative Commons. The war is coming, and they're supporting you...
What you are missing is how radioactive Pu-238 is compared to U-235 / U-238
Pu-238 half life 87.7 years. U-238 4.5 billion years, U-235 713 million years, so using pure U-235 the material is 8 million times less radioactive. -- So, you need a corresponding bigger lump of U-235. Needless to say, this is quite a different thing.
We're living in a period of transition of world power from the US (past) to China (future). China has been rapidly expanding its space exploration programs, just as the USA is gutting its. So this is quite OK - it just means that the drive to explore space is going to be coming from a different place. But it will still happen, and probably at a faster pace once China gets seriously ramped up, because unlike western powers, they aren't crippled by fear.
I know we all love our space projects here and I'm no exception - but the reality is that part of recovering from this unfathomly huge deficit is cutting spending.
If you were looking at your finances and were trying to take care of your debt aggressively you'd cut damned near anything not necessary. I can't really fault the politicians for this per se, but if they're going to make the programs we love suffer they need to continue cutting elsewhere as well (which appears to be happening relatively slowly and painfully). I've heard them mention there'd be sacrifice and thus I'd also like to see them cut their own benefits and salaries; however, I haven't seen such occur yet. (If it has and I've somehow missed it by all means educate me).
My questions to you all:
-If we start slashing budgets in this manner how does this affect jobs? Obviously there will be layoffs but will it be on a scale that's more/less devastating to our economy as a whole?
-Would you approach this specific funding issue differently?
-What else would you cut?
a Pu-238 battery is not a nuclear reactor. It's just a heat source and some thermocouples to make electricity from heat. Pu-238 only gives off alphas which can be stopped by sheet metal, or your skin for that matter.
With a budget of $18 Billion (so says wikipedia), they can find a way to fit in the $15 Million if they are actually planning an interplanetary mission.
As a recent graduate of an Astronomy program, all these recent cuts are making me sweat. How can we really complain about "not enough engineers" and "American science isn't what it should be" when every day I read about more cuts to the industry? How can we really have anything to dream and hope for, as human beings, as space exploration comes to a halt? What are the millions of children who want to become Astronauts going to dream about at night? Becoming a movie or hip-hop star? As a culture we need ideals that can produce hopes and dreams for our future; otherwise we won't have much of a future at all. Cutting spending to the space industry is the quickest way to crush all these aspirations.
Am-241, while only producing 1/4 the power of Pu-238 for a given volume, will output for centuries with its nearly 500 year half life. Much better for long term missions.
Fundamental minimum mass of a fission reactor is immense compared to the minimum size of a RTG. Also "no moving parts" fission reactors are hardly off the shelf, although there are theoretical ideas based on pebble beds. I would imagine a pebble bed reactor in zero-G transitioning to midcourse thruster acceleration would be quite a handful to theoretically simulate.
"Science flies us to the moon. Religion flies us into buildings." - Victor Stenger
This is what scares the living shit out of me 100 times more over then ANY nuclear reactor launch could ever do. People who say "Smart person A says this, it's what i believe too, so it's the only truth outthere and everyone else is WRONG!!!"
God save humanity...
You get 239Pu from power plants, along with 240Pu in high-burnup fuel. 238 is a small fraction and impractical to separate.
238 requires custom production, for example by separating and irradiating Neptunium 238. Which means reprocessing infrastructure, which is seriously expensive to build, and not exactly cheap to operate if you've already built it for other purposes.
Lets go bomb some third world countries at great expense instead!
Hes a real trooper that one
http://media.photobucket.com/image/successful+troll+/Daveed75/Memes/successful-troll-is-successful.jpg
Here to save the Erf!
C'mon, it isn't that high. Dr. Bob's more on the level of Creation Science....ack, gag me with a spoon....
Star Trek also said WWIII occured before first contact...
The United States currently has limited facilities to produce plutonium-238.[2] Since 1993, all of the plutonium-238 the U.S. has used in space probes has been purchased from Russia.
So exactly how is this dooming space probes?
submarines.
Yours In Moscow,
K. Trout, PatRIOT
Solar panels do just fine. The problem is the father away you travel from the sun the less energy you can produce. So unless you move from one star to another star as a source you need nuclear.
But please stop the bull shit that it costs too much to build solar panels. It doesn't. In the confines of a NASA budget the cost is nothing and yes we have the material here in the US.
Have they tried the Brits? They had a very extensive nuclear power programme and there are all kinds of used nuclear fuels from all the magnox and AGRs lying around at Sellafield.
Surely there must be something there that they can use?
Stick Men
http://nickelenergy.wordpress.com/2011/06/02/chief-scientist-at-nasa-langley-acknowledges-andrea-rossi-e-cat/
ummm no.
With P-238 you are using the radioactive decay, alpha I believe to create heat that you convert to electricity using a thermocouple.
With a reactor you are actually fissioning uranium and are making a lot more power. The problem is that reactors do not scale down well. http://hardware.slashdot.org/story/11/08/29/1337258/Developing-Nuclear-Power-Plant-Tech-For-the-Moon-and-Mars
Is a link about using space based reactors.
The US also flew some during the 60s as part of the SNAP project.
http://en.wikipedia.org/wiki/Systems_for_Nuclear_Auxiliary_Power
You can not make a reactor that is as small as an RTG but as the power out put goes up their mass to power increases and beats an RTG.
See my blog http://ilovecookes.blogspot.com/ for light hearted technical information.
either through the government or through trolling through Siberia and the Russian coastline looking for old Soviet Era lighthouses and power stations."
Now do yea? The mafia will be at your service, punk!
"Hello Iran, you want a nuclear programme? Well I'll tell you what, how about we lend you some gear, and we'll send over some guys to help you run it? Great! Now, when you get pretty good at Pu-238 we're going to want to buy everything you make. Oil? Nah, keep it..."
But yeah, you know, good point.
Blar.
It is financed entirely by dedicated taxes and presently has a surplus. There is certainly trouble ahead but in the near to mid term Social Security spending does not contribute to the Federal deficit and cutting Social Security spending will not reduce the Federal deficit.
On Defence, I agree with you.
Your are right. You can make RTGs the size of a coin. But the you can make reactors pretty dang small. The Snap-10a was only 600+ pounds.
See my blog http://ilovecookes.blogspot.com/ for light hearted technical information.
Summary:
The article notes that the only other source of PU-238 is Russia
Wikipedia:
Since 1993, all of the plutonium-238 the U.S. has used in space probes has been purchased from Russia. (http://nuclear.inl.gov/spacenuclear/docs/final72005faqs.pdf)
So the only option is to do what has been done since 1993. All right, so how is this article not FUD?
Democrats cutting science spending? I thought only Republicans did that! Or so we were told by left-wing blogs.
OK-dokey, so presume we're trying to put solar panels on Cassini.
Solar flux @ 1 A.U. (Earth's orbit) -- round to 1kW/m^2
Solar flux @ 10 A.U. (Saturn's aphelion) -- 10W/m^2
Power needed: 700W (to be generated by solar panels instead of RTGs)
Space-rated solar panel efficiency: ~10% (conservative figure takes into account degradation due to age and radiation)
Needed area: (700W)/(0.1)/(10W/m^2) = 700m^2
That's a freaking huge panel, almost as big as a pair of U.S. wing arrays on ISS. For a sense of scale, here's how big the darn things are.
Besides, you need extra fuel or energy to keep the damn things oriented towards the sun. This would likely add more weight since Cassini had to, first and foremost, take lots of pictures. Good luck with taking pics *and* pointing the solar panels. Of course you can have batteries like ISS does. All of this hassle adds significant risk to the mission.
A successful API design takes a mixture of software design and pedagogy.
Great, that's only 20 times the mass of the trio of RTGs on Cassini. And it produced a whole 3/4s the power. And was supposed to work for a whole year (vs. 13 and counting for the RTGs).
upon the advice of my lawyer, i have no sig at this time
from Wikipedia "Illudium Q-36 Explosive Space Modulator" (sometimes pronounced "Illudium Pu-36") what a stupe I was as a child - just getting the Illudium joke now ....
Cutting corporate taxes that encourage companies to bring manufacturing and jobs back to the Western world is a good thing. Less then 30% of the US economy is manufacturing now. During the US boom years manufacturing was 50% of GDP. Not everyone can work at Wal-Mart. Bring some lost jobs back home and we'll all see the economy improve.
"almost literally" - that would be "not really" then?
It just kills you better, and probably disperses much better in case of an accidental re-entry...
Social Security began running at a deficit (benefits payouts exceeds SS tax revenue) last year. Unless your plan is to cut benefits payments to exactly match the drop in SS tax revenue, its shortfall most certainly makes it part of the overall Federal budget we need to be worried about.
The money from Social Security taxes are tossed into the General Fund just like all other tax revenue.
And then that money is spent.
Which means, among other things, that if SS taxes don't go to paying SS, they will be spent on other things, thus reducing the total amount of money that needs to be borrowed.
Hence, the deficit reduction implicit in reducing SS outlays.
"I do not agree with what you say, but I will defend to the death your right to say it"
go fuck yourself you snake oil huckster
Or haven't there been more than a few semi-recent slashdot articles that have warned of (NASA/USA in general) running out of it (stuff to make RTG's) in the near future? This article just couches the same information but in a political text and everyone's going: OMG! Republican's are the Devil and Democrat's are the Anti-Christ!
A chunk of Pu isn't so dangerous? It ignites when exposed to air. The stuff is aptly named after the god of hell.
week / cheap rivets sank titantic.
At the time of the collision it is thought that Titanic was at her normal cruising speed of about 21 knots (39 km/h), which was less than her top speed of around 23 knots (43 km/h). At the time it was common (but not universal) practice to maintain normal speed in areas where icebergs were expected.
Fission != Decay. Pu-238 RTGs use decay heat, which is possible because of their short half-lives as you said, but the parent poster was positing the existence of some kind of micro-sized fission pile, which if it exists, would certainly extract energy from U-235 more quickly than natural decay.
However, any kind of active mechanical device, whether solar or nuclear for the heat source, will have significant longevity problems. You can't exactly do routine maintenance and lubrication a billion miles from the nearest service station. Might be useful for near-earth projects, but deep space probes are where RTGs are king, and probably always will be.
Can you be Even More Awesome?!
I seem to remember a test facility that was setup that could produce extremely high quality rare radioisotopes, oh wait a hole was drilled through it...
Link text
Ejecting highly radioactive and poisonous isotopes into space and then using earth as a slingshot is not only fool-hardy, but irresponsible. Find a different way of powering the probes, or do without. All you Trekky idiots aughta like this comment.
Per the 2010 Decadal Survey... "The committee is alarmed at the status of plutonium-238 availability for planetary exploration. Without a restart of plutonium-238 production, it will be impossible for the United States, or any other country, to conduct certain important types of planetary missions after this decade."
"Everything is linear if plotted log-log with a fat magic marker."
Well lets buy it from Russia then. IMHO one plant to produce Pu238 is enough.
Given that the Daiichi Nuclear Power Plant in Fukushima is spewing radioactive isotopes like there's no tomorrow (soon won't be if it keeps it up) can't the PU-238 coming from there be captured and "appropriated"?
When shit hits the fan get some of these https://youtu.be/pY-GncsZ-UE
They're wasting their limited budget on that instead of doing their job of aircraft and space exploration.
Climate change would be the job of the National Oceanic and Atmospheric Administration.
Mission creep is a killer.
Funny, there's a record of how much I've paid into Social Security.
Tell me how to find out (to the dollar) how much I've paid for highways or defense?
No?
See - just because the funds are fungible does NOT mean that it's just another tax. That's just what the Republicans want you to believe so that when they eliminate Social Security (I'm looking at YOU, Perry!) they can just steal the money for their own projects (tax breaks for the wealthy, military spending, etc) without paying any back to the citizens that need it.
Paranoia is a Survival Trait!
As I said reactors do not scale down as well.
The Topaz reactor that the USSR flew does a bit better.
The GPHS-RTG that Cassini uses makes around 500W for a mass of 57Kg.
Topaz made 5KW or ten times the power for a mass of 370Kg
So with Topaz one you have a better power output to weight than with the GPHS-RTG.
So if you need more power but for a short period of time a reactor is a better solution at about 5KW of output.
As I said reactors do not scale down well and RTGs do not scale up very well.
Oh and SNAP-10a is early 1960s tech, Topaz is 1980s tech. I have no idea what the specks on a modern system wold be like.
See my blog http://ilovecookes.blogspot.com/ for light hearted technical information.
No earth gravitation & earth rotation ( in some conditions )
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