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Tritium Transport in LLE: Investigations in the TITAN Collaboration. P. Sharpe, P. Calderoni, D.-K. Sze S. Konishi, S. Fukada, T. Terai and the TITAN Task 1-2 Team. FNST Meeting UCLA 12-14 August 2008. OUTLINE. LLE Database of Materials Properties Tritium Transport Data Variation

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slide1

Tritium Transport in LLE:

Investigations in theTITAN Collaboration

P. Sharpe, P. Calderoni, D.-K. SzeS. Konishi, S. Fukada, T. Teraiand the TITAN Task 1-2 Team

FNST Meeting

UCLA

12-14 August 2008

slide2

OUTLINE

LLE Database of Materials Properties

Tritium Transport Data Variation

Recent TITAN Task 1-2 Results

Upcoming Work in TITAN Task 1-2

slide3

LLE Database of Materials Properties

  • Strong interest by several parties in the utility of LLE (lead-lithium eutectic) for fusion blanket systems
    • ITER TBM designs - DFLL (CN), HCLL (EU), DCLL (US)
    • Advanced reactor concepts - ARIES (US), European Fusion PowerPlant Design Options Studies, etc.
  • Varying functional demands on LLE - tritium breeding and some degree of self-cooling
  • Nuclear systems licensing requirements must be considered for LLE
    • Pedigree of database, maturity of materials properties, applicationof codes and standards
    • ITER TBM’s will be licensed separately from ITER
  • A coordinated effort is underway to establish a Computing Expert System Database for LLE thermo-physical/chemical properties; intended international availability
  • Database incorporates uncertainty quantification and degree of consensus (e.g. different experiment techniques to obtain property values)
slide4

LLE Database of Materials Properties, cont.

Database classification:

General Design Parameters and Ranges on Interest

E and B fields - 0-1 kV/m, 0-15 T Neutron wall loading - 2.5 MW/m2Power density - ~1MW/m36Li burnup - ~ 0.1 at.% / fpd / GWthTemperature - 235˚C to 700˚CT pressure - 10 Pa to 10 kPaFlow velocity - ~ 1 mm/s to ~1 m/s

LLE Materials Standard Database (Bulk)

constitutive relations, thermodynamic properties,impurity characterization and behavior, chemical reactivity,H-isotope transport,and He bubble transport

LLE Materials Extended Database (MHD)

electric-magnetic properties,hydrodynamic correlations,and 2-phase dispersion correlations

Near-eutectic Composition Sensitivities

  • LLE chemical activity governed by Li activity
  • Tritium solubility variation from mixture disproportioning in cool areas or aggregation
  • Mixture standards and impurity tolerances
slide5

Tritium Transport Data Variations

courtesy L. Sedano, CIEMAT

slide6

Tritium Transport Data Variations, cont.

Diffusion Constant Variations:

Measurements from Desorption Technique

D=2.32x10‑7exp(‑27000/RT) m2s‑1

Fukada’s recent data

(Terai)

(2) D=4.03x10‑8 exp(‑19500/RT) m2s‑1

(Reiter)

(3) D=2.62x10‑9 exp(‑6630/RT) m2s‑1

(Shibuya)

(4) D(450°C)= 1.5×10‑9 m2s-1

(Fauvet & Sannier)

Moderate agreement - within an order of magnitude - from similar experiment arrangements. However sensitivity of D to mass transport correlations is needed for blanket system characterization.

courtesy I. Ricapito, ENEA CR Brasimone

slide7

Temperature, ˚C

727

560

440

350

282

225

Absorption techniques

Fukada

Aiello

Desorption techniques

No consensus on data range, nor even behavior at low partial pressure…

Tritium Transport Data Variations, cont.

Sievert’s Constant Variations:

courtesy I. Ricapito, ENEA CR Brasimone

slide8

Recent TITAN Task 1-2 Results

  • adsorption/desorption isothermmeasurement system installed at INL
  • Small quantities of LLE (~ 25g) testable inadsorption and desorption modes…
slide9

Recent TITAN Task 1-2 Results, cont.

Solubility Variations: Preliminary data

slide10

400 C

300 C

500 C

600 C

Recent TITAN Task 1-2 Results, cont.

Solubility Variations: Increasing temperature

dashed - Aiello (adsorption)

points - INL desorption data

solid - Reiter (desportion)

Solubiltiy (y-axis) expressed as concentration (atomic fraction) of hydrogen in LLE

Plotted as x-axis is p - p expressed in Pa and covering the range 1 - 1x105 Pa

slide11

Ar

Low pressure side

Molecular diffusion

recombination

LiPb

Atomic diffusion

Fe

High pressure side

Molecular diffusion

H2 or D2

dissociation

Li-Pb

Fe

Recent TITAN Task 1-2 Results, cont.

Solubility Variations: Fukada’s data

  • Test system assembled at Kyushu University; based on previous previous permeation tests in fusion liquid (Flinak and Flibe)
slide12

Recent TITAN Task 1-2 Results, cont.

Solubility Variations: Fukada’s data

slide13

Upcoming Work in TITAN Task 1-2

  • Testing of INL experiment using tritium
  • Testing of Kyushu experiment in bouyant convection configuration
  • Initiate design of LLE flow loop for testing T removal (vacuum permeator concept)

Thank you for your attention!

slide15

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slide21
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