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CBBI-14 20060907 JHF 1
Thermomechanical Model developed for the Pebble Bed Assembly applied to other Pebble Bed
Mock-Up Tests
J.H. FokkensNRG PPT
CBBI-14 20060907 JHF 2
• thermomechanical pebble bed model
• application to HCPB in-pile test element
• results HELICA analyses
• next steps
Contents _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 3
• reliable temperature prediction- feasibility in-pile test module- determination test matrix
• engineering tool- lay-out in-pile test module- determination of gas gap dimensions- determination of pre-compaction procedure- safety evaluation
Thermomechanical Pebble Bed Model (1) _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 4
• describe observed behaviour- non-linear elasticity- initial compaction behaviour- creep compaction behaviour- strain dependent thermal conductivity of pebble bed
• based on available test data- oedometer experiments
Thermomechanical Pebble Bed Model (2) _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 5
Thermomechnical Pebble Bed Model (3) _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 6
HCPB In-Pile Test Element _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 7
HCPB In-Pile Test Element _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 8
HELICA Geometry and FE-model _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 9
HELICA Thermal boundary conditions (1) _______________________________________________________________________________________________________________________
h = 10 W/m2K Tsink = 20oC
h = 145 W/m2K Tsink = 250oC
CBBI-14 20060907 JHF 10
HELICA Thermal boundary condition (2) _______________________________________________________________________________________________________________________
h = 84 W/m2K Tsink = 250oC
h = 84 W/m2K Tsink = 250oC
CBBI-14 20060907 JHF 11
HELICA Mechanical boundary conditions _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 12
HELICA Loading conditions _______________________________________________________________________________________________________________________
Schnorr springs (p = 0.09 MPa)
CBBI-14 20060907 JHF 13
• thermomechanical model for pebble bed- non-linear elasticity- initial compaction- creep compaction
• generalized plane strain• MSC.Marc Version 2005• gap development at interfaces pebble bed - solids• heat transfer through gaps by purge gas conduction• analysis of complete loading cycles
HELICA Summary of analysis _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 14
HELICA TC-positions (1) _______________________________________________________________________________________________________________________
2.70
16.5
102.70
CBBI-14 20060907 JHF 15
HELICA Results (1) _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 16
HELICA Results (2) _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 17
HELICA Results (3) _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 18
HELICA Results (4) _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 19
HELICA Results (5) _______________________________________________________________________________________________________________________
mean initial compaction strain
CBBI-14 20060907 JHF 20
HELICA Results (6) _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 21
HELICA Results (7) _______________________________________________________________________________________________________________________
mean creep compaction strain
CBBI-14 20060907 JHF 22
HELICA Results (8) _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 23
HELICA Results (9) _______________________________________________________________________________________________________________________
mean total compaction strain
CBBI-14 20060907 JHF 24
HELICA Results (10) _______________________________________________________________________________________________________________________
gap development after cooldown
CBBI-14 20060907 JHF 25
HELICA Results (11) _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 26
• comparison calculated results with TC measurements
• comparison calculated results with deformation measurements
• optimisation of boundary conditions
• improvement of thermomechanical pebble bed model
HELICA Next steps _______________________________________________________________________________________________________________________
CBBI-14 20060907 JHF 27
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