1. PIE program of STIP-V tungsten specimens for ESS target engineering
Jemila Habainy, Yong Dai, Yongjoong Lee, Srinivasan Iyengar
European Spallation Source, Paul Scherrer Institut, Lund University
6th High Power Targetry Workshop, 11-15th April 2016, Oxford

2. Outline ESS Tungsten target STIP-V project at PSI Scope of PIE program
Preliminary results
Summary
HPTW-6, Oxford, April 2016
Jemila Habainy

3. ESS Tungsten Target Target will operate at max. 500°C
Estimated lifetime of 5 years
Accumulated damage max. 10 dpa
dpa/year in Tungsten
HPTW-6, Oxford, April 2016
Jemila Habainy

4. SINQ Target Irradiation Program - STIP
2 year irradiation program at PSI
Spallation Neutron Source SINQ
560 MeV/ 1.3 mA
Proton beam
360x Zircaloy-2 clad Pb rods,
and specimen rods
HPTW-6, Oxford, April 2016
Jemila Habainy

5. STIP-V, Rods 3 and 5 STIP-V Irradiated between 2007-2008
Temperature and dose distribution profiles follow the 2-D Gaussian proton beam
2x hot-rolled tungsten bars, size: 60x8x1mm, at row 7; rods 3 and 5
5-28 dpa, 100°-800°C
HPTW-6, Oxford, April 2016
Jemila Habainy
Proton beam

6. 2 pieces of Tungsten extracted from Rod 38
~ 40
~ 12
HPTW-6, Oxford, April 2016
Jemila Habainy

7. EDM cutting plan for Rod 3
6x small bend samples, 8x2x1 mm
4x tensile samples, 4x16 mm
HPTW-6, Oxford, April 2016
Jemila Habainy

8. 7 pieces of tungsten in Rod 5
20 mm
The 5 larger pieces are about mm long.
HPTW-6, Oxford, April 2016
Jemila Habainy

9. EDM cutting plan for Rod 5
One 6 mm diameter disc and 4-6x bend samples of 8x2 mm were cut from each of the 5 larger pieces.
HPTW-6, Oxford, April 2016
Jemila Habainy

10. Cold cutting with reference tungsten
The entire cutting procedure was first performed on unirradiated reference tungsten
HPTW-6, Oxford, April 2016
Jemila Habainy

11. Cutting of active samples in Hot cellR3
HPTW-6, Oxford, April 2016
Jemila Habainy

12. Results after EDM cutting (low dose)
In total 31 samples successfully extracted:
4 Tensile
5 Discs
22 Small Bend Bars
Sample extraction work:
 800 hours manpower
10 days hot-cell
Specimen type
Size
Dose rate
Low dose specimen, handled manually
HPTW-6, Oxford, April 2016
Jemila Habainy

13. High dose specimen Highly active samples:
Dose rate up to 12 mSv/h at 10 cm
(limit 20 mSv/person/year)
Require special handling, currently waiting for licensing of semi-hot cell
HPTW-6, Oxford, April 2016
Jemila Habainy

14. PIE plan for STIP-V tungsten specimen
Bend tests
6 low dose , 16 high dose bars
Ductility and flexural stress/strain
Tensile tests
4 high dose specimen
Yield and tensile strength
Hardness tests
Irradiation hardening as a function of dose
Thermal diffusivity with Laser Flash Apparatus
2 low dose, 3 high dose discs
Thermal conductivity and specific heat capacity
SEM & TEM microscopy
Fracture mode and microstructural changes at different doses and temperatures
HPTW-6, Oxford, April 2016
Jemila Habainy

15. Bar sample preparation and PIE
Starting with 6x low dose bars.
Polishing
Hardness measurements
3-point bend test
Gamma spectrum analysis
SEM fractography
HPTW-6, Oxford, April 2016
Jemila Habainy

16. PIE: Gamma spectroscopy & Hardness measurements
Nuclide/ Activity* [MBq]
Hf-172
5.200
Ti-44
0.110
Lu-172
20.00
Co-57
0.081
Tm-172
0.890
Co-58
0.750
Lu-179
0.240
Co-60
0.096
Hf-182
0.450
Rh-102
0.082
Os-182
0.390
Ru-106
0.330
Re-188
Hardness increase from 400 to nearly 700 HV0.5 after 4.4 dpa
Hf-172 (1.87y) and Lu-172 (6.70d) main nuclides (measured 7 years after irradiation)
Radiation damage: dpa
*Results from SBB-5 specimen
Specimen
dpa
Dose rate
(mSv/h in 10 cm)
Weight (g)
Lu172 MBq/g
SBB-1
1.64
0.82
24.5
SBB-2
2.33
1.00
28.7
SBB-3
3.3
1.30
36.6
SBB-4
1.5
0.98
29.5
SBB-5
4.4
1.40
40.1
SBB-6
2.4
1.20
33.6
Disc-1
6.67
2.90
101.2
Disc-2
4.04
2.40
83.8
HPTW-6, Oxford, April 2016
Jemila Habainy

17. PIE results: 3-point bending test
SBB-6
SBB-2
SBB-1

18. PIE results: 3-point bending test
HPTW-6, Oxford, April 2016
Jemila Habainy

19. Next step High dose specimen cannot be handled in glove box
Currently waiting for licensing of new semi hot cell
Low dose discs to be tested with LFA for thermal diffusivity data
HPTW-6, Oxford, April 2016
Jemila Habainy

20. Summary Scope of PIE program Preliminary PIE results Tensile tests
Thermal diffusivity measurements
3-point bending tests
Hardness measurements
TEM/SEM microscopy
Preliminary PIE results
Tungsten shows no ductility at 2.4 dpa and at target operating temperature.
Hardness increased almost 40% after 4.4 dpa.
Will provide crucial information about proton/neutron irradiation effects on tungsten
HPTW-6, Oxford, April 2016
Jemila Habainy