MEGAPIE experiment. EURISOL 2nd TOWN MEETING. January 24th and 25th, 2002 ITALY. Th. Kirchner

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1 EURISOL 2nd TOWN MEETING January 24th and 25th, 2002 ITALY Th. Kirchner Ecole des Mines de Nantes; 4 rue Alfred Kastler; BP 20722; Nantes cedex 03; FRANCE Thomas KIRCHNER, SUBATECH

2 Context of the MEGAPIE project A A + + Systems to be validated: B B + + C D Experimental ADS (with irradiation capability) Experimental ATW (transmutation demonstration) HIGH INTENSITY ACCELERATOR A A B C D : I p 5mA; E p MeV : P MWt : k eff ; P : MWt : MA dominated fuels in the same core as Steps towards validation A : the IPHI project (High Intensity Proton Injector) and follow up program (e.g. super conducting cavities etc.) A + B : the MEGAPIE project (with existing A ) B + C : the MUSE program (with "known" B ) : dedicated fuel program (characterisation, fabrication, D irradiation, reprocessing) C TARGET (EX: PbBi) Thomas KIRCHNER, SUBATECH 2 B External source MULTIPLYING MEDIUM: WITH STANDARD FUEL WITH DEDICATED FUEL C D MS 2000/065

3 The MEGAPIE Initiative MEGAPIE Collaboration : CEA, FZK, PSI, CNRS, ENEA, SCK-CEN, JAERI, DOE, KAERI Objective : Design, build, operate, explore and decommission a liquid lead-bismuth spallation target for MW of beam power at the existing SINQ facility. Thomas KIRCHNER, SUBATECH 3

4 Accelerator complex at PSI Thomas KIRCHNER, SUBATECH 4

5 The MEGAPIE boundary conditions Exchange flask positioning base 970 Highest hook position in exchange flask 950 max , Heat removal zone ,5 Heat transport zone Neutron production zone SINQ target main dimensions and clearances to surroundings Target transport sleeve Exchange flask gate valve 22 20, , , BQ82 sinq-ta.dwg Bottom of target storage pit MP_basic conceot.ppt Top of proton beam collimator Thomas KIRCHNER, SUBATECH 5

6 The MEGAPIE target and ancillary systems Thomas KIRCHNER, SUBATECH 6

7 The MEGAPIE hot part Target top target head target top shielding Upper hot part upper LM container target heat exchanger oil leak detector Lower hot part lower LM container leak detector Thomas KIRCHNER, SUBATECH

8 The MEGAPIE hot part Oil Distribution Box Target Head Lower LM container Heat Exchanger Central Rod EM Pump housing D2O distribution box Oil Leak Detector Main Flow Guide Tube Thomas KIRCHNER, SUBATECH 2

9 The MEGAPIE heat deposition data 200 Comparison of FLUKA data and analytical curve heat deposition in Megapie, PSI Local heat deposition (W/cm 3 ) FLUKA data Analytical curve Axial distance from window inner surface (cm) Heat distribution within a CFD model of the MEGAPIE target LBE Window Hull Guide Tube Total kw 5.5 kw.3 kw 6.3 kw kw Thomas KIRCHNER, SUBATECH 3

10 The MEGAPIE target systems : The lower LM container - The MEGAPIE window material : - T9 (9CrMoNbV) - Based on FEM calculations the following reference data are valid for the window region : - Window thickness in the center :,5 mm - Window thickness at the edges : 2,0 mm - Temperature at the inlet (top) of the guide tube for the by-pass flow : 230 C - Temperature at the outlet (bottom) of the guide tube : 240 C - T9 inner wall temperature (contact side to the PbBi) : 344 C - T9 outer wall temperature : 354 C Thickness 4 mm These data should correspond to an optimal heat exchange coefficient in the region between : W/(m 2. C) experimental validation : KALLA (FZK) Thickness 2 mm Corrosion rate : for T < 400 C corrosion rate < 00 µm/ year (F. Barbier from PbLi - data ) experimental data for PbBi required Thickness,5 mm Window catcher Thomas KIRCHNER, SUBATECH 4

11 The LiSoR project Objective : Validation of the T9 steel as MEAGPIE window material Problematic : LM embrittlement under irradiation and mechanical stress LiSoR project : Realization of a liquid lead-bismuth loop for the irradiation of material test samples under MEGAPIE operating conditions LiSoR specifications Beam energy : 72 MeV Loop material : A36L Beam current : 50 µa Test tube material : T9 Average irradiation time : 20 days Radiation damage : dpa Tensile specimen : T9 LM : Pb-Bi eutectic LM temperature : 300 C max. Mechanical load : static tensile test (500 MPa); rupture test Thomas KIRCHNER, SUBATECH 5

12 The LiSoR test section Test tube No irradiation Proton beam No mechanical constrain Tensile specimen Thomas KIRCHNER, SUBATECH

13 The LiSoR loop in OBLA at PSI First irradiation June 2002 Thomas KIRCHNER, SUBATECH 2

14 The MEGAPIE target systems : The lower target enclosure 22mm 92mm Safety windows AlMg3/Zy 3/4/3mm D2O Y Vacuum AlMg3/Zy 59.5 R20 X 22mm 92mm AlMg3/Zy 3/4/3mm D2O AlMg3/Zy Vacuum Z Vacuum X Thomas KIRCHNER, SUBATECH 3

15 The MEGAPIE target systems : The lower target enclosure (N/mm2) Lower Target Enclosure Upper Target Enclosure Thomas KIRCHNER, SUBATECH 4

16 The MEGAPIE target systems : The electromagnetic pump system LM flow : forced convection flow Manufactured and tested in RIGA Main Stream Pump: straight through pump with upward flow nominal flow rate for lead bismuth eutectic : 5 litre / second nominal operating lead bismuth eutectic temperature range: 80 to 400 o C maximal operating temperature of EMP coils: 450 o C pressure drop in the outer loop: 0.2 bar Bypass Pump: straight through pump with upward flow and flow redirection downwards in the Bypass tube nominal flow rate for lead bismuth eutectic : 0.35 litre / second nominal operating lead bismuth eutectic temperature range: 80 to 300 o C maximal operating temperature of EMP coils: 450 o C pressure drop in the outer loop: 0.3 bar at 0.35 litre/second in a 20mm bypass tube (LM speed at nozzle :,7m/s) Thomas KIRCHNER, SUBATECH 5 AR VP00 AR V00 3 AR GR00 AR BB00 Ar AR V00 2 AR ET00 LMT T 00 AR V00 AR SV00 AR SV TS PT0 TS PT0 3 LMT V00 AR V00 4 AR ET AR SV00To Ar 3 injector TS LD0 TS LD0 2 TS PT OL V00 2 LML LML PT0 FM0 OL OP00 OL V00 TS PT0 4 LML P T0 2 LML T V00 LML T V00 2 LML H E00 OL HE00 Cooling wate r

17 The MEGAPIE target systems : The heat exchanger system Beam current on SINQ target: 66h period Requirements for heat exchanger and heat removal system : evacuate 700 kwatt of heat cope with frequent short beam trips and occasional unstable operation prevent PbBi from freezing 2 single wall heat exchanger pins Beam current, microa min average 30 min. average Time (hours) DIPHYL THT (oil) as organic coolant Heat Exchanger Total coolant flow : 0 l/s Coolant T(in): C Coolant T(out) : 48 C PbBi T (in) : 330 C PbBi T(out) : 223 C Oil distribution Elastic spacer with Upper Target Enclosure Thomas KIRCHNER, SUBATECH 6

18 The MEGAPIE instrumentation No - 3 Tc (PbBi system) 6 n-flux 7-3 Tc 4 flow 5 level 6 P 7 V (EMP) 8 I (EMP) 9 P (Isolation gas system : Ar) 2 Tc (Safety hull cooling system 22 P and window) 23 flow 24 PbBi leak 25 Beam Tc (Interm. coolant system) 30 P 3 flow 32 level 33 Tc (Fil and drain system) 34 P 35 Tc (Coolant system enclosure in safety hull) Thomas KIRCHNER, SUBATECH 7

19 The MEGAPIE systems : Target head Hook system D2O connections Oil in- and outlet Fill and drain tubes El. connections Top shielding Central rod interface D2O distribution box Thomas KIRCHNER, SUBATECH 8

20 The MEGAPIE Target testing Thomas KIRCHNER, SUBATECH 9

21 The MEGAPIE schedule ADS planning (loi 9) Engineering Design 2002 Technical and safety baseline Detail Design, Manufacturing System Integration, Testing and Commissioning Operation 2006 Feasibility and definition of an European installation PIE and Decommissioning Thomas KIRCHNER, SUBATECH 0

22 The MEGAPIE - TEST EU Program Objectives : Design and development of the MEGAPIE spallation target, Comprehensive testing and assessment under beam-off condition, Commissioning and first operation period under beam-on condition, Feedback on high power neutron spallation sources in general. WP Target development Design; Design support and validation; Safety; Licensing WP2 Target testing Sub-system, component; Integral testing; Overall target performance assessment WP3 Synthesis Feedback for Pb-Bi; Planning for MEGAPIE irradiation phase (6th FP); Planning of MEGAPIE Decommissioning (6th FP); Beam-on reporting Thomas KIRCHNER, SUBATECH

23 Conclusion and feedback from operation MEGAPIE First LM spallation target for MW beam power; Concerted effort between design team and design support (R&D) teams; Full feasibility demonstration of a spallation target system; Evaluation of radiation and damage effects of structures and beam window in a realistic spallation spectrum; Effectiveness of the window cooling under realistic conditions; Liquid metal / metal interactions under irradiation and stress; Licensing of a liquid metal spallation target Post irradiation examination; Demonstration of decommissioning; Thomas KIRCHNER, SUBATECH 2