Criticality safety assessment of tank 241-C-106 remediation Page: 12 of 83
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WHC-SD-W320-CSA-001 REV 0
CONTENTS
1.0 INTRODUCTION ... .... .. ...........-.-. 1-1
2.0 TANK 241-C-106 REMEDIATION PROGRAM .... . ........... 2-1
3.0 CHEMICAL CONSIDERATIONS - PLUTONIUM CONTAINING SOLIDS .. ..... 3-1
3.1 INTRODUCTION ...... . .............. 3-1
3.2 ADSORPTION ......... . ....... ....... 3-3
3.2.1 Formation Mechanisms .... . ........... 3-3
3.2.2 Composition of Solids and Sluicing Solutions ...... 3-6
3.2.3 Important Chemical Parameters . ........... 3-8
3.2.4 Plutonium/Absorber Ratios .. . ........... 3-8
3.3 SOLUBILITY ........ . ... ............ 3-13
3.4 SOLID-SOLID SOLUTION .. ...... .......... 3-17
3.5 EFFECTS OF AGING ........... . .......... 3-20
3.5.1 Adsorption ....... . .......... 3-20
3.5.2 Solubility ........ ... . .......... 3-21
4.0 PHYSICAL CONSIDERATIONS - SLUICING INDUCED SEPARATIONS .... ... 4-1
4.1 ONE-DIMENSIONAL SIMPLIFIED SETTLING SIMULATIONS .. ....... 4-1
4.1.1 Simplified Sedimentation Model . ...... ...... 4-1
4.1.2 Simulation Results ... ..... ........... 4-4
4.2 TWO-DIMENSIONAL ANALYTICAL MODELS .. ... ........... 4-6
4.3 THREE-DIMENSIONAL TEMPEST MODELING .. ........... 4-6
4.3.1 Tank 241-C-106 Pump Out Simulation .. ......... 4-7
4.3.2 Tank 241-AY-102 ........... ......... 4-8
4.4 OTHER EFFECTS ... ........ ......... 4-11
4.5 CONCLUSIONS FROM FLUID DYNAMIC MODELING .. . ......... 4-14
5.0 CRITICALITY CONSIDERATIONS FOR SLUICING . ............ 5-1
5.1 FISSILE MATERIAL CONCENTRATION . . ............ 5-1
5.2 DEFENSE IN DEPTH . ..... ........... ... . 5-4
5.2.1 Neutron Moderation 5-4
5.2.2 Areal Concentration Limit - =240 g Pu/ft2 (2600 g
Pu/in2).... .. ............... .. .. ...... .. .. ....5-5
5.2.3 Neutron Absorbers . .... . ......... ... 5-6
5.2.4 Geometry .......... ............ 5-8
5.3 PERSPECTIVE ON PLUTONIUM CONCENTRATION
WITHIN TANKS 241-C-106 AND 241-AY-102 . ... . ......... 5-8
6.0 CONCLUSIONS ... . .. . .. .......... .... 6-1
7.0 REFERENCES ......... ....... . ......... 7-1ix
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Waltar, A. E. Criticality safety assessment of tank 241-C-106 remediation, report, July 19, 1996; Richland, Washington. (https://digital.library.unt.edu/ark:/67531/metadc702698/m1/12/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.