ESS Bilbao Initiative Workshop
Multi-MW Spallation Neutron Sources:
Current Challenges and Future Prospects
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ESS-Bilbao Initiative Workshop. R&D Towards mitigation of cavitation damage in the SNS mercury target vessel

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R&D Towards mitigation of cavitation damage in the SNS mercury target vessel

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ESS-Bilbao Initiative Workshop. R&D Towards mitigation of cavitation damage in the SNS mercury target vessel

  1. 1. ESS Bilbao Initiative Workshop Multi-MW Spallation Neutron Sources: Current Challenges and Future Prospects March 16-18, 2009 Bilbao, Spain
  2. 2. • ! quot;# • $% !& •' # quot; – ( # •) # * ! 2 Managed by UT-Battelle for the U.S. Department of Energy
  3. 3. Target-to-core vessel inflatable seal Mercury vessel Target-to-Hg piping seal Water shroud 3 Managed by UT-Battelle for the U.S. Department of Energy
  4. 4. !quot;µ # 200 WNR pulses on test target • * –+ ! !! # , -$ # –) # ! –) # . /0 ) 0 4 Managed by UT-Battelle for the U.S. Department of Energy
  5. 5. $%& µ ' •/ ( 3 & ! 1 .2 –/ ( %4 5 2 7 - 45 ! 6# ! 8 9 # # :: ; ! - %µ <2 = / 8 =% ! 79 * SNS @ 2 MW 5 Managed by UT-Battelle for the U.S. Department of Energy
  6. 6. $ • # ## > # # 6 6 2 –? ! ! @ %@A B @ %% µ 8( – ## ! 9 •/ ! !! ! # ## ! # # ! ! 6 Managed by UT-Battelle for the U.S. Department of Energy
  7. 7. ( ) $ ) *+ •) quot; # ! # ', C 8 6 DDA9 • 85 6 DD=9 –E ! !! !; –F ! E @ ! • ' $%%%6 . 0 C ' 8. 0 C '9 # ! ! #> ! * 2. • ' quot;# * !!quot; ! $%% $%%$ – – 7 Managed by UT-Battelle for the U.S. Department of Energy
  8. 8. , •, # @ 4%% ( G A 6 ∝ /H I –& # • @ ! ! # J 6 6# !6 ! 6 # • ! # ! ( •G # @H G 8 ( /H # 9 ! 8 Managed by UT-Battelle for the U.S. Department of Energy
  9. 9. •' quot; quot;# • , !!quot; ! •K quot; ! •) # .0 C 0 2. 9 Managed by UT-Battelle for the U.S. Department of Energy
  10. 10. -. . / *0 1 * 0 # • # ( DD4 8& * 9 –' # –' !!# # ! ! # ( •C $%% 10 Managed by UT-Battelle for the U.S. Department of Energy
  11. 11. -. / *0 1., • ! . $%% • # ! $%% . ! $%%$ # ( J 6 6! 6# • $%%A ! 6# ## > • $%% 0 )C J < # ## ! & • $%%= G # ! ! ! L 11 Managed by UT-Battelle for the U.S. Department of Energy
  12. 12. , & 2 •) # *. • # ! •/ # , / M GN @H @% 2 / C MK ? N %@= %H / @A =@ % $@= % / !; M& < N % $A * <M N C 6 - $%% 4% @6 - 4% = % ) 6O - % C M( . N $ A $@ @ M .2 N D @$ 4 D /( M /N $A HH A% P %= P %= : 1 %%% WNR: Weapons Neutron Research facility at the Los Alamos Neutron Science Center 12 Managed by UT-Battelle for the U.S. Department of Energy
  13. 13. , Mercury filled test target being Simulation of test target response to prepared for in-beam test beam show mercury pressure evolution [Pa] Mercury in state of cavitation What is the tensile strength of mercury? 1.5 bar 13 Managed by UT-Battelle for the U.S. Department of Energy
  14. 14. 3 4 •K ! –0# ! # # –0 ! – ! # ## # • ! # ## # 6# # ## !! – ( !* •' quot; quot;# ! $%%$ ! quot; $# # # # J #H • ' quot;# $%%A > # ## J #H • . /0 ) ' 8 !!quot; 9J # A 14 Managed by UT-Battelle for the U.S. Department of Energy
  15. 15. 5 5# • + !quot; • ! –, * ; 6! )+ # ( 6 6 @ • # ! # # ! 6 @ @6 # ## • ! 28 J $H 2 9 15 Managed by UT-Battelle for the U.S. Department of Energy
  16. 16. 5 ABS: 3 pairs of acoustic transducers • ! 6' Q 0 ## 80 9 # + • E Q ! •E ! 8E 5 9 ! + 8> ! # +) 2 0 9 •. # ## # ! L ! .0 C 0 # ## SNS Target Test Facility 16 Managed by UT-Battelle for the U.S. Department of Energy
  17. 17. 6 *0 1 •0 < # ## •) # J Damage Test – Specimens (DTS) ( # – , !! Bubbler #2 # ## @ 50.8 mm 25.4 mm Bubbler #1 Storage Tank Mercury Pump 1.5 mm 17 Managed by UT-Battelle for the U.S. Department of Energy
  18. 18. 1/ 7 88 %& 9 : A B C Bubbler #1 Bubbler #2 Bubbler #2 Helium Argon Helium Series average Series average Series average VF = 3.56E-04 VF = 1.34E-03 VF = 1.37E-03 18 Managed by UT-Battelle for the U.S. Department of Energy
  19. 19. 4 ; < ( 7 %& *: 99 = 2.0E-03 1.8E-03 B1 01D-S01_04D-S02S07S08 140 sccm, Total VF = 1.29E-03 B2 140 sccm, Total VF = 4.74E-03 04D-S09S11 1.6E-03 B1 04Dec06State03 300 sccm, Total VF = 2.61E-03 B2 Number density [n/mm ] 300 sccm, Total VF = 3.46E-03 04Dec06State10 3 1.4E-03 1.2E-03 Smallest bubble: 0.12 mm equivalent radius. 1.0E-03 8.0E-04 Corresponds to 2005 damage test condition. 6.0E-04 4.0E-04 2.0E-04 0.0E+00 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2 Radius [mm] 19 Managed by UT-Battelle for the U.S. Department of Energy
  20. 20. > . 5& •, 1 %@$ L ' 1 %@ L ! #, 1 %@A • ! % 2 • ! •K ! %@ A %% *From JAEA collaborators For coaxial flow For cross flow 20 Managed by UT-Battelle for the U.S. Department of Energy
  21. 21. 6.0 A Edge Bubble Diameter [mm] Transmission 5.0 Acoustic 4.0 UL = 0 3.0 2.0 1.0 UL = 0 ; QHe = 10 sccm 0.0 4.5 B 4.0 Bubble Diameter [mm] UL = 0.63 m/s 3.5 3.0 2.5 2.0 1.5 1.0 0.5 UL = 0.63 m/s; QHe = 10 sccm 0.0 3.0 C Bubble Diameter [mm] 2.5 UL = 0.96 m/s 2.0 1.5 1.0 0.5 UL = 0.63 m/s; QHe = 100 sccm 0.0 0.1 1 10 100 1000 Gas flow rate [SCCM] • # ## !! # !# ! 21 Managed by UT-Battelle # ## 6# < for the U.S. Department of Energy
  22. 22. 6 •K # )+ # ! 2 ! ! –0 # # ## •) •C # * !# ! – ) +R 6+ 6 )) S6 6, + • ! ; ## ( – # ## 8 9 –K –K + 22 Managed by UT-Battelle for the U.S. Department of Energy
  23. 23. ( # bubble coalescence Db =1.196 mm Db =1.049 mm Fluent CFX Db =1.064 mm (measured) 23 Managed by UT-Battelle for the U.S. Department of Energy
  24. 24. ) SNS Target configuration TTF Target only has main flow 24 Managed by UT-Battelle for the U.S. Department of Energy
  25. 25. ? * •+ K T > ! 8 9 • ! quot; ! T ! ! ! 6 6 quot; •/ G K T ! # # # 25 Managed by UT-Battelle for the U.S. Department of Energy
  26. 26. 4 * • ! $%%$ quot; quot;# • ! • B !# %B 26 Managed by UT-Battelle for the U.S. Department of Energy
  27. 27. 5 27 Managed by UT-Battelle for the U.S. Department of Energy
  28. 28. 5 = & Replaceable insert Ri = 41 mm Outer acrylic window 28 Managed by UT-Battelle for the U.S. Department of Energy
  29. 29. 1 / $ = 5 # •K > %@A ' • - 2$ ! • A %% & ! ! @ Mercury flow quasi- stagnation point. Viewport 29 Managed by UT-Battelle for the U.S. Department of Energy
  30. 30. . (. . • ! !! ! θ8 9 T D %U P φ 8 !quot; 9 •+ # < 6 6 6 # 30 Managed by UT-Battelle for the U.S. Department of Energy
  31. 31. $ Nominal Hg Flow, Gas Flow = 1000 sccm 7A31903 Gas injection 31 Managed by UT-Battelle for the U.S. Department of Energy
  32. 32. / • ( ! quot; ! • !! @! # .0 C 0 Q ' Mercury flow left to right Gas Injected at this Nozzle Vertical grooves (0.5 mm pitch, V 30 deg) 32 Managed by UT-Battelle for the U.S. Department of Energy
  33. 33. 2010 - . 33 Managed by UT-Battelle for the U.S. Department of Energy
  34. 34. 6 2010 $ 1/ Flow guides increase flow Hg Flow velocity to more prototypic SNS conditions Test surface with 33 mm surface texturing 34 Managed by UT-Battelle for the U.S. Department of Energy
  35. 35. -. , •C # # ! H –!% & ' 3 test surfaces per target 35 Managed by UT-Battelle for the U.S. Department of Energy
  36. 36. )*0 1 ; 8' ): # HIGH intensity 1 σ_X = 13.5 mm 1 σ_Y = 4.5 mm 2σ Rectangular target interior 4.8 MW SNS eq, 1.625 x 5.625” MEDIUM intensity 1 σ_X = 21 mm 1 σ_Y = 7 mm 2σ 2.0 MW SNS eq. LOW intensity 1 σ_X = 30 mm 1 σ_Y = 10 mm 2σ 1.0 MW SNS eq. Total energy deposited in targets is maintained between conditions. 36 Managed by UT-Battelle Intensity varied by changing beam spot size. for the U.S. Department of Energy
  37. 37. 1 protons / Maximum σ_X σ _Y Target – Test No. of Pulses pulse length Comment pulse Intensity µ x 1012 [µs] [mm] [mm] [p/mm2 x 1010] (approx.) (half width) (half height) LDV & PCD testing. Varied RECT – LDV 95 0.1 – 27 0.3 14.8 – 33.6 4.6 – 10.4 5.6 intensities by changing profile and various beam protons RECT – High Request smallest possible beam 100 26.5 0.3 15.4 5.2 5.25 Intensity spot with 3:1 aspect ratio RECT – Medium This condition roughly splits low 100 26.6 0.3 20.2 6.1 3.43 Intensity and high RECT – Low This is about the largest beam that 100 26.3 0.3 32.5 9.5 1.36 fits inside target at 2 σ Intensity RECT – textured Cone type textured test surface; 100 26.5 0.3 21.2 6.7 2.95 surface Gas puffing suspected not correct RECT – Long Long pulse beam conditions still 100 45 ? 833 20.4 6.1 6.0 ? pulse under study Primary damage dependence on intensity scope 37 Managed by UT-Battelle for the U.S. Department of Energy
  38. 38. 0 • ?# – !# ! – ; # .0 C 0 # ! L ! !!quot; quot;# •C ! 8A T A ( & < 9 – C) * G +? –() !* •/ 8 $@$A & <9 –, C) – ,# ! ? 38 Managed by UT-Battelle for the U.S. Department of Energy
  39. 39. 1/ , 5@ * 2 1 Velocity (m/s) -1 -2 1.2 1.4 1.6 1.8 2 Time (ms) 39 Managed by UT-Battelle for the U.S. Department of Energy
  40. 40. 1. Band pass velocity data (15 – 300 kHz) Omit 10 µs after pulse 2. 0.1 High CPD = V 2 dt intensity CDP (mm2/s) Medium intensity 0.05 Low intensity Interesting artifact is consistent 2 ms after incidence 0 2 3 4 Time (ms) 40 Managed by UT-Battelle for the U.S. Department of Energy
  41. 41. ) 6 / # $2 ) /8 9 ! ! 8%@% – H 9 80 20 %9 %@ %@%D & @H=        %@%= %@% $ @%%        %@% $ %@% %@= H        , K /E C - %@%%% : %@% • )/ V ! – L !L • +, – V • 0 0FE ! !! # 41 Managed by UT-Battelle for the U.S. Department of Energy
  42. 42. • ( ; ! – C !! < # ## –/ ! ! ! # • - 4%% ( G L $S G –) J •E ! # # 6 @ •G ! 89 # ! 42 Managed by UT-Battelle for the U.S. Department of Energy
  43. 43. 2010 :2 • T. # # • ! 8! 9C T. TE 0 C # • ! # ! •C ! ! ! •& !! ! •) ! # ; ( 43 Managed by UT-Battelle for the U.S. Department of Energy
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