Radiological Issues for Thin Liquid Wall Options L. El-Guebaly, P. Wilson, and D. Henderson Fusion Technology Institute University of Wisconsin - Madison.

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Radiological Issues for Thin Liquid Wall Options L. El-Guebaly, P. Wilson, and D. Henderson Fusion Technology Institute University of Wisconsin - Madison With input from M. Sawan, R. Peterson, I. Sviatoslavsky, E. Mogahed (UW), R. Raffray (UCSD), L. Waganer (Boeing), W. Meier, R. Moir (LLNL), S. Abdel-Khalik, M. Yuda (GT), and D. Petti (INEEL) ARIES Meeting April , 2002 UW

2 Develop activation approach for liquid wall supply methods: –Tangential injection –Porous wall injection Identify activation issues for candidate liquid wall (LW) materials: Liquid Metals * Molten Salts LiPbFlibe # Pb Sn Consider two extreme activation cases: –No mixing of LW material with breeder (worst case) –Mixing of LW material with breeder inside and outside chamber (proposed for ARIES-IFE-HIB) Develop design solutions for activation problems ___________ * No major activation problems expected for Li # (LiF) 2, BeF 2. Flinabe (NaF, LiF, BeF 2 ) exhibits similar behavior Objectives

3 Activation Assessment Includes: –Activity for safety analysis –Decay heat for LOCA/LOFA analysis –Waste management: Means for waste minimization: –Use same liquid breeder for LW –Clean-up LW and reuse in other devices –Clear from radiologically controlled area if Clearance Index < 1 (unlikely) Waste disposal in repositories: –Generate only low level waste (LLW) to meet ARIES requirements –Any high level waste (HLW)?

4 Blanket:Candidate LW Materials Liquid breeders:PreferredBackup LiPb * LiPb * Pb Flibe  Flinabe Li # Li # Ga LiSnLiSn Sn Recommendation: Use same breeder for LW to minimize waste Solid breeders: Li 2 O **, Li 2 ZrO 3, Li 4 SiO 4, Pb ** Sn, Ga Li 2 TiO 3, LiAlO 2 ______________________________ * HIBALL (UW-1981), HIBALL-II (UW-1984), LIBRA (UW-1990), LIBRA-SP (UW-1995)  OSIRIUS (LLNL-1992) # LIBRA-LiTE (UW-1991) ** Prometheus (MDC-1992) LW and Breeder Options

5 In-chamber residence time for LW is unknown  parameterize it Ex-chamber residence time ≈ 50 s, per Waganer LW Cycle Hohlraum Debris, T, Buffer Gas, and Transmutation Products Chamber Heat recovery, T extraction, and Clean up processes LW Injection LW Vapor/Drops, Hohlraum Debris, Buffer Gas, and Others t in ? T out ~50 s Breeder

6 Tangential Injection Option Heat recovery, T extraction, and Clean up processes LW Material LW Vapor/Drops, Hohlraum Debris, Buffer Gas Hohlraum Debris, T, Buffer Gas, and Transmutation Products LW Solid Wall Blanket No outside mixing of LW with breeder

7 Porous Wall Injection - Option I (Liquid Breeder Blanket - Proposed for ARIES-IFE) Heat recovery, T extraction, and Clean up processes Breeder LW Vapor/Drops, Hohlraum Debris, Buffer Gas Hohlraum Debris, T, Buffer Gas, and Transmutation Products LW Porous Wall Blanket Supply Channel Route breeder exiting supply channel through blanket to increase ∆T and enhance thermal conversion efficiency Use same breeder for LW to minimize waste

8 Porous Wall Injection - Option II (Solid Breeder Blanket - Prometheus type ) Heat recovery, T extraction, and Clean up processes LW Material LW Vapor/Drops, Hohlraum Debris, Buffer Gas Hohlraum Debris, T, Buffer Gas, and Transmutation Products LW Porous Wall Blanket Supply Channel No mixing with solid breeder outside chamber (Prometheus type) 1 mm

9 Representative Radial Build for LiPb Breeder Using ARIES-AT Design Rules SiC/SiC composite structure and LiPb LW/coolant/breeder Design parameters (per Raffray): SiC T max 1000 o C Surface heat flux≤ 1 MW/m 2  Chamber radius≥ 6 m LiPb ∆T o C LiPb velocity4-6 m/s LiPb T max 1100 o C LW Thickness1 mm LW Porous Wall (90% SiC, 10% LiPb) Blanket (20% SiC, 80% LiPb) (TBR~1.1) Supply Channel (10% SiC, 90% LiPb) SiC Wall 0.5 Thickness (cm) In-chamber residence time ? ? 5 s 140 s

10 Perkins’ neutron spectrum for HIB target (av. E n =11.75 MeV) Parameters: Target yield458.7 MJ Rep rate 4 Hz (0.25 s between pulses) Chamber radius6 m Neutron wall loading2.8 MW/m 2 Plant lifetime40 FPY Availability 85% In-chamber residence time for LW depends on evaporation and condensation processes. LW may survive thousands of pulses before being processed and re-injected into chamber  Parameterize in-chamber residence time between 0.25 s (1 pulse) and several tens of minutes (~10,000 pulses) Impurities included in all materials LW materials only. No target debris Same radial build used for all LW candidates No mixing during operation. Mixing with EOL * Waste disposal rating (WDR) evaluated at 100 y after operation using Fetter’s limits for LiPb, Pb, and Sn and NRC-10CFR61 limits for Flibe and Flinabe Exact model of all pulses using ALARA pulsed activation code ______________ * Conservative assumption Activation Parameters and Assumptions

11 WDR - Tangential Injection (No Outside Mixing with Breeder) WDR increases with LW residence time and saturates at ~ 40 min LW materials generate tons of HLW unless residence time and/or exposure time are controlled Sn and Flibe have lower WDR compared to Pb and LiPb To reuse materials in other devices or dispose as LLW waste: –Limit LW service life  higher inventory. Use fresh LiPb and Pb after 2-3 y and fresh Sn and Flibe after y if in-chamber residence time ≥ 40 min (Bi impurity control below 43 wppm helps prolong LiPb/Pb service lifetime), –Or, control in-chamber residence time to ≤ 2-3 s for Pb/LiPb and s for Sn/Flibe –Or, filter out cup(s) of transmutation products and dispose as HLW

12 WDR ≤ 1 No Transmutation Removal Option IOption II Max Exposure Residence Max Residence Time Time Exposure WDR* Time Time LiPb69 3 s 47 y ≥ 40 min 2.5 y Pb s 47 y ≥ 40 min 2.2 y Sn6 20 s 47 y ≥ 40 min 14.4 y Flibe9 25 s 47 y ≥ 40 min 15.6 y On-line removal of transmutation products relaxes limits on residence/exposure times, thus reduces EOL inventory, but generates cup(s) of HLW _________________ * ≥ 40 min in-chamber residence time and 47 y of operation WDR - Tangential Injection - Cont. (No Outside Mixing with Breeder)

13 Example: Liquid breeder used in all components. Proposed for ARIES-IFE Blanket controls volumetric average WDR WDR is not sensitive to in-chamber residence time of LW Results for 47 y of operation: WDR * LiPb10 Flibe0.8 No waste disposal problem identified for Flibe even without clean-up system To reuse LiPb in other devices or dispose as LLW, filter out cup(s) of transmutation products and dispose as HLW Do not limit exposure time for sizable breeders (> 1000 tons) ______________ * No transmutation removal. WDR - Porous Wall Injection (Outside Mixing with same Breeder)

14 Example: Solid breeder blanket with Pb (or Sn) seeping from supply channel through porous wall 1 mm thick LW controls volumetric average WDR #  Need more accurate evaluation for in-chamber residence time Results for ≥ 40 min residence time and 47 y of operation: WDR * Pb14 Sn0.94 No waste disposal problem identified for Sn even without clean-up system Without LW contribution, WDR of Pb in supply channel is ~2  HLW To reuse Pb in other devices or dispose as LLW, filter out cup(s) of Bi and dispose as HLW ______________ * No transmutation removal # 86% from LW and 14% from supply channel WDR - Porous Wall Injection (No Outside Mixing with Breeder - Prometheus-type)

15 Main Contributors to WDR LiPb, Pb 208 Bi Sn 108m Ag, 121m Sn, 126 Sn Flibe 14 C

16 Conclusions Employ same breeder for LW to minimize waste volume Tangential injection case without clean-up system: –All LW materials generates HLW if in-chamber residence time exceeds 2-25 s, depending on materials Porous wall injection case without clean-up system : –No waste disposal problems identified for Sn and Flibe –LiPb and Pb generate HLW if employed for 47 y On-line clean-up system removes cup(s) of transmutation products (HLW) and allows tons of LW materials to be reused in other devices or disposed as LLW Some results are sensitive to in-chamber residence time that is unknown and needs to be determined