1. UCN Beamline Shielding, Target & Remote-Handling UCN CDR (Sept/2010) L.Lee

2. UCN Shielding Requirements A.Trudel calculations (TRIUMF Safety Group) 40  A, 500 MeV protons stopping in W target Assumes 0.5 m empty space around target (no moderator) Plot shows the shielding needed to reduce dose to 3  Sv/hr outside General Layout of Shielding Structure Inner layer of Steel Outer layer of Concrete

3. Shielding Costs Latest UCN Layout Vendor Quotes: Concrete$1251 k Steel (radioactive)$ 360 k (66%) Steel (new)$ 480 k (33%) Staging/Installation$ 20 k Total$2111 k Latest UCN Layout: Concrete$ 834 k Steel (radioactive)$ 240 k (66%) Steel (new)$ 320 k (33%) Staging/Installation$ 20 k Total$1414 k Original Cost Estimate (CFI prop): Concrete$ 900 k Steel (radioactive)$ 200 k (66%) Steel (new)$ 700 k (33%) Staging/Installation$ 20 k Total$1820 k Above estimates based on bulk volume estimates+20% contingency More detailed layout TRIUMF Design Office (A.Prorok)

4. Detailed Layout of UCN Shielding (1 st Iteration) Extent of existing Shielding Wall UCN Concrete Shielding UCN Steel Shielding

5. UCN Shielding – Layer 1 Concrete shielding blocks – Yellow Steel shielding blocks – Black/Silver

6. UCN Shielding – Layer 3

7. UCN Shielding – Layer 5

8. UCN Shielding – Layer 7

9. UCN Shielding – Layer 9

10. UCN Shielding Structure 4’ x 6’ x 18’ Concrete shielding blocks (on-hand, outside “Electronics” Trailer) Reuse existing concrete blocks from M11/M13  1836 ft 3 ~50 m 3

11. Shielding Costs from 1 st Iteration Layout Possible Cost Savings:  “Skyshine” dose limits are higher  remove uppermost 2 layers of shielding (?)  savings of ~ 22%  $225 k  Reuse existing steel from magnets  possible savings  $ 75 k Total savings  $300 k 1 st Iteration UCN Layout: Concrete$ 445 k Steel (radioactive)$ 485 k Steel (new)$ 240 k Staging/Installation$ 20 k Total$1190 k If above savings can be implemented, total cost for shielding  $890 k 2 nd Iteration Layout  Possible further improvements in “blocking” efficiency

12. Initial startup at 2  A (500 nA time-averaged)  Target cooling and residual activity  not a major issue  RCNP @ 1  A  radiative cooling found to be adequate  residual activity  very low At higher currents 40  A (10  A time-averaged)  Require Target Cooling  Water-cooling vs Helium-cooling  Model target after elements from existing designs at BNL, KEK, TRIUMF  Budget: $30k Residual Activity & Remote-Handling  Retract target into a shielded cask  TRIUMF Remote-Handling specialists consulted  do-able at $100k  Target failure  Transfer to Horizontal transport flask (e.g. 2C-STF flask) and crane to existing Hot Cell facility Prior to installation at TRIUMF (recent initiative with RCNP)  Spallation Target & RH system  use at RCNP  RCNP: 2  A to 10  A (instantaneous)  Ideal opportunity to test system and resolve Cooling/RH issues Spallation Target & Remote-Handling System

13. Target Design BNL target  Pt target (segmented) coupled to Copper base  Water-cooled base  Heat load ~ 2kW (time-avg)  TRIUMF people involved in design of this target UCN target  Tungsten alloy (HeavyMet) target; d~5 cm, L~11-14 cm  Coupled to water-cooled base (Cu?)  Heat load ~ 5kW (time-avg)  Water flow rate ~10 L/min to remove instantaneous heat load Model target after BNL target

14. Beam 300K D 2 O 20K D 2 O Target Cooling Block Coolant Lines Rails/Bearings Bellows Rack & Pinion System Driveshaft (detachable) Pb-Shielded Cask Pb-Shielded Shutters Flexible Shaft (remote-control cables) He 80 cm Remote-Handling System (Upstream Withdrawal) Pb-Shielded Cask and Target Mounting System

15. Water-Cooling Setup for 1AT1/T2 Target Ladder Bellows & Coaxial water lines on Target Ladder Custom seals TRIUMF M/Shop

16. Target in Retracted Position  Retract Target into Cask  Access UCN cryostat OR Prep for Target Removal

17. Target Removal/Disposal External Transport Flask (e.g. 2C-STF flask)  Relocate Target + Cask to external (horizontal) transport Flask  Crane to Meson Hall Hot-Cell facility

18. Costs & Human Resources Summary  More details in main Resources & Timeline Section  Possible reduction in Human Resources requirements: RCNP (Tgt), Acsion (Tgt, Shielding)

19. Shielding: Final designmid-2012 Procure shielding mid-2012  mid-2014 Install Base layer mid-2013  Dec/2013 Install remaining layersmid-2014  mid-2015 Target & RH system: Receive Target @ TRIUMF: Mar/2014 Install Target @ TRIUMF: May/2014 Schedule: Shielding and Target/RH Overview of Main Milestones (details in Resources & Timeline Section)

20. The End

21. Shielding Costs ORIGINAL (“With PIF”) UCN LayoutNEW (“No PIF”) UCN Layout Shielding Budgets Original cost estimate (total)  $1820 k (from CFI proposal) Vendor Quotes: Concrete$1251 k Steel (radioactive)$ 360 k (66%) Steel (new)$ 480 k (33%) Staging/Installation$ 20 k Total$2111 k Latest UCN Layout: Concrete$ 834 k Steel (radioactive)$ 240 k (66%) Steel (new)$ 320 k (33%) Staging/Installation$ 20 k Total$1414 k

22. UCN Shielding – Layer 2 (Base Layers)

24. Water-cooling vs Helium-cooling Water CoolingHelium Cooling Good cooling efficiencyLow cooling efficiency  high flow velocities req. “Conventional” technologyGreater Technical & Regulatory (ASME) complexity Activation of waterLow Activation Leaks  Contamination RisksLow Contamination Risks Boiling of Coolant Two Water-cooled targets (1AT1 & 1AT2) in operation “near-by” Water-cooling infrastructure already available

25. Spallation Target Calculations from Safety (A.Trudel) indicates target activity level after 10 years of irradiation will still be a factor of ~5 below the A 2 transport limit  A stopping target of tungsten bombarded with 100 uA of 500 MeV protons.  Blue arrows correspond to 1, 5 & 10 years of irradiation.  Shown below the arrow is the total activity as a fraction of the A 2 transport limit.  The inventory of activity in the target at ten years is at approximately one fifth of the A 2 transport limit for Type A packages.