Search found 49 matches

by clumma
Jan 20, 2015 2:45 pm
Forum: China
Topic: Partnership SINAP - ANSTO
Replies: 4
Views: 4680

Re: Partnership SINAP - ANSTO

"we continue to support...", even if they don't really mean it
American leadership would never say something like that about nuclear. :lol:

-Carl
by clumma
Oct 07, 2013 1:32 am
Forum: Reprocessing, Transmutation, Waste Storage
Topic: Borehole Waste Disposal
Replies: 57
Views: 8530

Re: Borehole disposal study

Cyril R wrote:Lots of water, plus critical reactors, yet the fission products didn't get out even in 1.5 billion years. No engineered barriers, no isolating layers, just porous sandstone. Shows you how paranoid we are about geo storage.
The fission products did get out. It's the TRUs that were contained.
by clumma
Jun 09, 2013 3:32 pm
Forum: General Discussion
Topic: Minimum Critical Mass for Natural Uranium Reactor????
Replies: 31
Views: 3449

Re: Minimum Critical Mass for Natural Uranium Reactor????

For HEU, the smallest fuel load for criticality can be had with the most effective moderator: ordinary hydrogen. See attached. Deuterium has a higher moderating ratio than hydrogen. How does H2O outperform D2O here? Is it that we're looking at k >> 1 (as opposed to k ~~ 1) and neutron loss isn't so...
by clumma
Jun 08, 2013 4:57 am
Forum: General Discussion
Topic: Minimum Critical Mass for Natural Uranium Reactor????
Replies: 31
Views: 3449

Re: Minimum Critical Mass for Natural Uranium Reactor????

Are you sure that homogeneous gives the lowest fissile startup? Heterogeneous would reduce resonance captures, though perhaps at some cost of self-shielding. I'm not sure, and would appreciate any information on the fuel loading of the ARGUS reactor. I googled just now and found a slide deck that s...
by clumma
Jun 06, 2013 2:30 am
Forum: General Discussion
Topic: Minimum Critical Mass for Natural Uranium Reactor????
Replies: 31
Views: 3449

Re: Minimum Critical Mass for Natural Uranium Reactor????

According to Vogelaar 2010, CP-1 contained 52 tons Unat. I believe but am not certain he means short tons (corresponding to 47 metric tons). He gives the minimum ever achieved with graphite at 15 tons. But recent experiments at Duke and LANL suggest modern graphite has 30% less parasitic neutron abs...
by clumma
Aug 07, 2012 2:11 pm
Forum: China
Topic: China started "thorium based molten salt reactor" project
Replies: 164
Views: 79165

Chinese TMSR Colloquium at UC Berkeley

Yesterday afternoon, several members of this community converged at UC Berkeley to hear Kun Chen of the Shanghai INstitute of Applied Physics (SINAP) describe the Chinese "TMSR" effort launched last year. http://events.berkeley.edu/index.php/calendar/sn/NUC.html?event_ID=51922 Chen outlined the hist...
by clumma
Dec 13, 2011 4:21 am
Forum: Liquid-Metal-Cooled Reactors
Topic: Traveling Wave Reactor
Replies: 240
Views: 49207

Re: Traveling Wave Reactor

Yeah, I like the FHR/AHTR concepts quite a lot, and I agree the atmospheric-pressure operation (and greater thermal capacity) of molten salt is an advantage. Still, having thousands of spherical fuel elements bobbing around in there concerns me for some reason. I assume the moderation provided by th...
by clumma
Dec 12, 2011 3:08 pm
Forum: Liquid-Metal-Cooled Reactors
Topic: Traveling Wave Reactor
Replies: 240
Views: 49207

Re: Traveling Wave Reactor

Ft St Vrain had prismatic graphite fuel embedded with both fissile and fertile (thorium) TRISO particles. In fact it contained over 20 times more thorium than uranium. The fuel is said to be much cheaper to produce than normal fuel rods. Another spec sheet says it was rated to 100 GWd/t (6 years in ...
by clumma
Dec 12, 2011 1:54 pm
Forum: Liquid-Metal-Cooled Reactors
Topic: Traveling Wave Reactor
Replies: 240
Views: 49207

Re: Traveling Wave Reactor

@Cyril In the paper they say the neutronics support up to 40% burnup (400 GWd/tHM) without reprocessing. @Jaro Where did you get the 3-D model? Are you sure you're not looking at the demo plant, which has fast flux test ports and other access for maintenance? By the way, by some accounts the thermal...
by clumma
Dec 11, 2011 6:38 pm
Forum: Liquid-Metal-Cooled Reactors
Topic: Traveling Wave Reactor
Replies: 240
Views: 49207

Re: Traveling Wave Reactor

Thanks Jaro, I'll try to watch that later tonight. Probably it has a lot of the same info as this paper http://lumma.org/temp/Ellis_et_al-TWRs_A_Truly_Sustainable_Resource.pdf which was taken down from the site hosting it, but not before I could yank it from the Google cache. Get it while it's hot -...
by clumma
Dec 07, 2011 3:02 pm
Forum: Liquid-Metal-Cooled Reactors
Topic: Traveling Wave Reactor
Replies: 240
Views: 49207

Re: Traveling Wave Reactor

Thanks Jonathan for your informative post on the TWR. I lived in Gainesville for a year in 1997. Really nice place.
by clumma
May 20, 2010 4:36 pm
Forum: Reprocessing, Transmutation, Waste Storage
Topic: How much nuclear opposition is driven by waste longevity?
Replies: 271
Views: 84694

Re: How much nuclear opposition is driven by waste longevity?

Sorry my post was so cryptic to you, but the answer is yes. And this is my last response to all the bait you have tossed out in this thread. Your second and last, contributing a grand total of zero information. Good for you! Sorry, third. You said earlier that TRISO fuel was invented for naval use....
by clumma
May 20, 2010 3:11 am
Forum: Reprocessing, Transmutation, Waste Storage
Topic: How much nuclear opposition is driven by waste longevity?
Replies: 271
Views: 84694

Re: How much nuclear opposition is driven by waste longevity?

More of the 'if it worked, people would be using it' fallacy? I could say the same thing about LFTR itself. Proliferation is not a technical issue but if it were, selling LFTR as proliferation-proof would be incorrect. This hasn't been the first time I've discovered revisionist conspiracy theories d...
by clumma
May 19, 2010 10:50 pm
Forum: Reprocessing, Transmutation, Waste Storage
Topic: How much nuclear opposition is driven by waste longevity?
Replies: 271
Views: 84694

Re: How much nuclear opposition is driven by waste longevity?

Have you considered these factors? When you post something coherent, I'll certainly consider it. I'll agree with the first part of your statement: you are not a weapons expert. Having worked over three decades at one of the nuclear priesthood labs, you can be assured they are not selecting material...
by clumma
May 19, 2010 6:51 pm
Forum: Reprocessing, Transmutation, Waste Storage
Topic: How much nuclear opposition is driven by waste longevity?
Replies: 271
Views: 84694

Re: How much nuclear opposition is driven by waste longevity?

Any reference to pure U233 is dishonest. Pure U233 does not exist and cannot exist. I already gave a plausible argument that U233 with 5% U232 is perfectly suitable for a weapon, even if the material is a year old. Pa-233 will be mixed with Pa-231 as a result of Th230 contamination in Th232. Th230 ...