Depletion does not occur when having materials flow in a cyclic manner

[Luke_Seifert]

It seems that if the user creates a flow regime which has a material loop back around to its starting material, then depletion does not occur for any material connected with the flow regime. Here is an example input file that has a cube of fuel salt surrounded by graphite subdivided into different material regions that can show this behaviour.

Code: Select all

set title "Cyclic Flow Bug"


%__________SURFACE DEFINITIONS__________%
% Outer graphite
 surf ogc cuboid -50 50 -50 50 -50 50
% Inner Fuel Salt Cube vol of 1E6
 surf ifs cuboid -25 25 -25 25 -25 25
% Subdivisions
 surf sub0 cuboid -25 25 -25 25 -25.0 -15.0
 surf sub1 cuboid -25 25 -25 25 -15.0 -5.0
 surf sub2 cuboid -25 25 -25 25 -5.0 5.0
 surf sub3 cuboid -25 25 -25 25 5.0 15.0
 surf sub4 cuboid -25 25 -25 25 15.0 25.0

%__________CELL DEFINITIONS__________%
% Outside
 cell 999 0 outside ogc
 cell gr_cu 0 graphite ifs -ogc
% Subdivisions
 cell cell0 0 fuelsalt0 -sub0
 cell cell1 0 fuelsalt1 -sub1
 cell cell2 0 fuelsalt2 -sub2
 cell cell3 0 fuelsalt3 -sub3
 cell cell4 0 fuelsalt4 -sub4


%__________MATERIAL DEFINITIONS__________%
% Graphite Moderator
mat graphite -1.8
rgb 130 130 130
6000.09c -1


mat fuelsalt0 -1.94
rgb 10 10 10
vol 25000.0
burn 1

  4009.09c  -0.014487655439    %  Be-9
  9019.09c  -0.376674024719    %  F-19
 11023.09c  -0.234064237192    %  Na-23
 90232.09c  -0.295304238725    %  Th-232
 92234.09c  -0.000174400907    %  U-234
 92235.09c  -0.019679584059    %  U-235
 92236.09c  -0.000090911860    %  U-236
 92238.09c  -0.059524947099    %  U-238


mat fuelsalt1 -1.94
rgb 10 10 10
vol 25000.0
burn 1

  4009.09c  -0.014487655439    %  Be-9
  9019.09c  -0.376674024719    %  F-19
 11023.09c  -0.234064237192    %  Na-23
 90232.09c  -0.295304238725    %  Th-232
 92234.09c  -0.000174400907    %  U-234
 92235.09c  -0.019679584059    %  U-235
 92236.09c  -0.000090911860    %  U-236
 92238.09c  -0.059524947099    %  U-238

mat fuelsalt2 -1.94
rgb 10 10 10
vol 25000.0
burn 1

  4009.09c  -0.014487655439    %  Be-9
  9019.09c  -0.376674024719    %  F-19
 11023.09c  -0.234064237192    %  Na-23
 90232.09c  -0.295304238725    %  Th-232
 92234.09c  -0.000174400907    %  U-234
 92235.09c  -0.019679584059    %  U-235
 92236.09c  -0.000090911860    %  U-236
 92238.09c  -0.059524947099    %  U-238

mat fuelsalt3 -1.94
rgb 10 10 10
vol 25000.0
burn 1

  4009.09c  -0.014487655439    %  Be-9
  9019.09c  -0.376674024719    %  F-19
 11023.09c  -0.234064237192    %  Na-23
 90232.09c  -0.295304238725    %  Th-232
 92234.09c  -0.000174400907    %  U-234
 92235.09c  -0.019679584059    %  U-235
 92236.09c  -0.000090911860    %  U-236
 92238.09c  -0.059524947099    %  U-238


mat fuelsalt4 -1.94
rgb 18 18 18
vol 25000.0
burn 1

  4009.09c  -0.014487655439    %  Be-9
  9019.09c  -0.376674024719    %  F-19
 11023.09c  -0.234064237192    %  Na-23
 90232.09c  -0.295304238725    %  Th-232
 92234.09c  -0.000174400907    %  U-234
 92235.09c  -0.019679584059    %  U-235
 92236.09c  -0.000090911860    %  U-236
 92238.09c  -0.059524947099    %  U-238


set pcc 0
set powdens 1
set mcvol 500000
%set arr 2
set printm 1
set inventory
Th
U
922350
932370



set acelib "/projects/sciteam/bbcc/serpent/xsdata/jeff312/sss_jeff312.xsdata"
set declib "/projects/sciteam/bbcc/serpent/xsdata/jeff312/sss_jeff33.dec"
set nfylib "/projects/sciteam/bbcc/serpent/xsdata/jeff312/sss_jeff33.nfy"



set pop 5000 100 40

% Changing from "all" did not seem to fix bug.
mflow cycle_pump
 all 0.2

mflow cycle_pump1
 all 0.1

mflow cycle_pump2
 all 0.3


% Changing between type 0, 1, and 2 did not seem to fix bug.
rep flowprocess
 rc fuelsalt0 fuelsalt1 cycle_pump 0
 rc fuelsalt1 fuelsalt2 cycle_pump1 1
 rc fuelsalt2 fuelsalt0 cycle_pump2 2


dep
pro flowprocess
daystep


0.00116 0.00116 0.00116 0.00116

After running this code and checking the depletion output, it can be seen that fuelsalt3 and fuelsalt4 deplete as expected, while the other fuelsalts which form the cyclic flow regime established in rep flowprocess do not deplete.