Axil- Regarding permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-UR-17-21903<http://permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-UR-17-21903>egarding:
I think this document indicates that the reactor’s temperature coefficient changes sign from positive to negative at high temperatures around 800 C. They note that additional reactivity must be added to get to the desired operating temperature. I still did not see a clear discussion of a prompt criticality at the lower temperatures where the positive temperature coefficient exists. The document does indicate that the change in reactivity is associated with expansion of the reactor with temperature. However the slow kinetics associated with expansion will not stop a rapid multiplication of k-eff. considering epi-thermal neutrons which can cause run-away reaction or an explosion. The epi-thermal neutron cross sections of the various nuclear species in the reactor are important when it comes to prompt critical evaluation, as I would assume the folks at LANL are aware. For example I wonder if the epi-thermal neutron cross sections for molybdenum are well established? I think they are well established for Hf and Zr, neither of which metals are used in the reactor. I am not sure how boron reacts to a fast neutron flux. It may actually multiply fast neutrons. The report should clearly address this potential accident. If you saw such an analysis that I have missed, please correct me. Bob Cook ________________________________ From: Axil Axil <janap...@gmail.com> Sent: Thursday, November 16, 2017 6:30:05 PM To: vortex-l Subject: Re: [Vo]:dark matter update--Mills' hydrinoes are a good bet Try permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-UR-17-21903<http://permalink.lanl.gov/object/tr?what=info:lanl-repo/lareport/LA-UR-17-21903> On Thu, Nov 16, 2017 at 9:03 PM, Adrian Ashfield <a.ashfi...@verizon.net<mailto:a.ashfi...@verizon.net>> wrote: Tghanks Axil, I have seen that data and what you wrote on the other thread about conversion to electric power. My eyesight is not good but that section of the Stirling engine was too simplified to figure out how it works. -----Original Message----- From: Axil Axil <janap...@gmail.com<mailto:janap...@gmail.com>> To: vortex-l <email@example.com<mailto:firstname.lastname@example.org>> Sent: Thu, Nov 16, 2017 8:50 pm Subject: Re: [Vo]:dark matter update--Mills' hydrinoes are a good bet There is a lot of info on the "kilopower" that NASA is designing for Mars power to replace solar cells. https://www.outerplaces.com/science/item/17087-nasa-kilopower-mars The heat pipe driven Stirling converter is impressive at an efficiency of 38% at 800C. On Thu, Nov 16, 2017 at 8:34 PM, Adrian Ashfield <a.ashfi...@verizon.net<mailto:a.ashfi...@verizon.net>> wrote: Axil, Do you have any info on the Stirling engines. I couldn't find anything useful on line. Apart for the SunCell , it looks like it would simple enough to use the E-Cat QZ as the heat source.