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 

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 

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 <>
Sent: Thursday, November 16, 2017 6:30:05 PM
To: vortex-l
Subject: Re: [Vo]:dark matter update--Mills' hydrinoes are a good bet


On Thu, Nov 16, 2017 at 9:03 PM, Adrian Ashfield 
<<>> 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 <<>>
To: vortex-l <<>>
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.

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 
<<>> wrote:
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.

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