Subject: Effect of Proposed Al Liners in Vicinity of Reactor
In the present design 4" I.D. Al liners 1/8" thick are to traverse the
reflector and reach the reactor vessel. There will be in all ten of these.
In the reflector near the surface of the reactor there will be considerable
contamination of the graphite due to this Al which will result in an increase in
the amount of U235 needed for criticality as well as a distention of the flux in
If we consider a six inch section around the reactor 6" high and assume
a homogeneous mixture, the following data is obtained (See Calculations):
This means that the diffusion length L is
L [~=] 31 cm.
|Volume of region||= [pi](r1² - r2²) 15 cm||=|
|= [pi](30² - 15²) 15||= [pi]15(900-225)|
|= 47.2(675) = 31800 cm³|
||0.115||= (0.222) 0.115x1023|