What, if anything, do you know about this? Thanks.

]]>In the step when the uranium peroxide is precipitated out, can 6 %, pharmacy, hydrogen peroxide be used?

Thanks, ]]>

Contact tangazazen@aol.com ]]>

I’d be happy to share outputs from MCNP with you, but have no way of getting in touch. Shoot me an email and I will reply. The real problem with uranyl nitrate, as I mentioned, is that it is always crystallized as a hexahydrate commercially, and even this little bit of light hydrogen is a huge reactivity penalty in nat-U/D2O homogenous reactors. That alone is a good reason to choose something else (like the oxide, as you mentioned).

-Carl ]]>

For a homogeneous configuration the fast fission factor ‘e’ is close to unity but by lumping the fuel this can be raised to 1.1 or so .The number of fast fission neutrons produced per thermal neutron absorbed in uranium ‘z’ is for a U28 / U25 of 137.8 is 1.335.

Using the four factor equation for Kinf, the condition that a chain reaction be possible in a homogeneous system of finite size is such that Kfin >1, or zfp >1, that is pf >1/z = 0.75, where ‘f’ = thermal utilization and ‘p’ = resonance escape probability.

For this the resonance escape probability ‘p’ and the thermal utilization ‘f’ must both be in the region of 0.85. Setting the moderator to fuel as N1/No, an analysis gives:-

For U-Graphite pf = 0.604 and Kinf 0.81 at N1/No = 400.

UO2-H2O__ pf = 0.595__Kinf 0.8___5.

UO2-D2O___ pf = 0.874__Kinf 1.17__300-400.

Hence a chain reaction is a homogeneous system is only possible for the D2O-UO2 arrangement.

As far as I am aware nobody has ever built such an arrangement. The big problem would be the radiological-decomposition of the moderator which for enriched systems was overcome by using a catalytic converter.

I would be interested in the results of your computer programme. ]]>