Vault-BL1A Shielding Plug
Sept 26, 2012L.Lee
NUCN Installation-1: 2014 Shutdown
Shielding “Plug” will need to be reconfigured
“Existing” Vault-BL1A Shielding Plug
What is the required shielding “plug” thickness between the Vault & BL1A?When UCN beamline (septum & dipole) is installed, the shielding “plug”between the Vault and BL1A tunnel will need to be reconfigured.
CYCL.VAULT
BL1A
Vault-BL1A/1U Shielding Plug
Footprint of the shielding plug will be reduced slightly.What are the requirements for the “new” shielding plug with BL1U installed?How thick does the “new” shielding plug need to be?
CYCL.VAULT
BL1A
BL1U
Vault-BL1A/1U Shielding RequirementsWhat are the requirements for the shielding “plug” with BL1U installed? (Preliminary discussions with A.Trudel) - Prompt Radiation Hazard (PRH) Study - Based on occupancy in 1A/1U tunnel with beam ON in vault:
Dose rate in accessible areas < 100 Sv/hr Annual personnel dose limits from chronic losses < 1 mSv
- Dose rate constraints for various accidental full beam loss scenarios (e.g. accidental insertion of 1A stripper, failure of 2AVB1 bender) Dose rate outside shielding < 50 mSv/hr Dose limit per full loss event < 1 mSv
How thick does the “new” shielding need to be? - Based on dose rates from various scenarios mentioned above (PRH study, simulation studies, surveys/measurements) - Design to maintain overall effective thickness (t ) in shielding “plug”
Is a Shielding-Plug “Task Force” needed?
Layout Option: Maintain effective thickness of shieldingReplace some of the concrete w/ higher density mat’l
Vault Elements
Higher Density Shielding Materials
Replacing some concrete blocks with higher density material
Issues/Considerations:
- Re-use existing concrete blocks, as much as possibleCosts, Storage fewer removed blocks (potentially activated)
- Combine with denser (Steel) blocks
- Combine with denser (Hematite-aggregate concrete) blocks
Concrete/Hematite aggregate shielding blocks (from NSS)Variable/Customizable density (3.8 - 5.7 g/cc)Used at reactors (Ontario – 25 yrs), SNS, TRIUMFNSS has worked with Ellis-Don, Burnco, LaFargeNSS Meeting at TRIUMF on Sep.10, 2012 (M.Chopra)
Layout Options (“First-Pass” study):(1) Replace some concrete w/ steel blocks ( ~ 3:1 thickness ratio)(2) Replace some concrete w/ aggregate blocks ( ~ 2:1 thickness ratio)
Shielding Plug Layout: Option-1Replace some concrete with steel blocks ( ~ 3:1 thickness ratio)
“First-Pass” study using SolidWorks 3D-Model of Meson Hall West
SolidWorks 3D-Model of Meson Hall West
CYCL.VAULT
BL1ATUNNEL
Beampipe to BL1A
ImmovableBlock East (to T1,
T2, TNF)
Existing Shielding (Layers A-D)(UPPER LAYERS E-J HIDDEN)
Vault-1A“Plug”
Existing Shielding (Layers A+B+C)(LAYER D & UPPER LAYERS E-J HIDDEN)
Existing Shielding (Layer A+B)(LAYERS C+D & UPPER LAYERS E-J HIDDEN)
Existing Shielding (Layer A)(LAYERS B+C+D & UPPER LAYERS E-J HIDDEN)
“New” Shielding Layout (Layer A)“FIRST-PASS” STUDY : OPTION-1 (STEEL)
Blue – steel, newYellow – concrete, new (w/ cut-out)
“New” Shielding Layout (Layer A+B)“FIRST-PASS” STUDY : OPTION-1 (STEEL)
Blue – steel, newYellow – concrete, new (w/ cut-out)
“New” Shielding Layout (Layer A+B+C)“FIRST-PASS” STUDY : OPTION-1 (STEEL)
Blue – steel, newYellow – concrete, new (w/ cut-out)
“New” Shielding Layout (Layer A+B+C+D)“FIRST-PASS” STUDY : OPTION-1 (STEEL)
Blue – steel, newYellow – concrete, new (w/ cut-out)
List of “Removed” Concrete Blocks: List of “New” Blocks:(2) 12’ x 6’ x 4’ (Layer A, C) (5) 2’ x 3’ x 6’ steel (Layer A)(7) 2’ x 3’ x 6’ (Layer A) (1) 2’ x 3’ x 6’ steel* (Layer A)(1) 6’ x 3’ x 2’ (Layer C) (2) 2’ x 3’ x 6’ concrete* (Layer A)(5) 2’ x 3’ x 2’ (Layer D) (1) 6’ x 3’ x 2’ concrete* (Layer C)
(6) 2’ x 3’ x 2’ steel (Layer D)(38% of existing) *block with “cut-out” for 1U beampipe
Vault-1A Shielding Layout (Layers A-D)EXISTING vs “NEW” (OPTION-1, STEEL)
List of “Removed” Concrete Blocks: List of “New” Blocks:(2) 12’ x 6’ x 4’ (Layer A, C) (7) 2’ x 3’ x 6’ aggregate (Layer A)(6) 2’ x 3’ x 6’ (Layer A) (1) 2’ x 3’ x 6’ aggregate* (Layer A)(5) 6’ x 3’ x 2’ (Layer A, B, C) (2) 2’ x 3’ x 6’ concrete* (Layer A)(4) 2’ x 3’ x 2’ (Layer D) (1) 6’ x 3’ x 2’ concrete* (Layer C)
(8) 2’ x 3’ x 2’ aggregate (Layer D)(42% of existing) *block with “cut-out” for 1U beampipe
Vault-1A Shielding Layout (Layers A-D)EXISTING vs “NEW” (OPTION-2, AGGREGATE)
More Information onHigh-density Shielding
Blocks from NSS(Nuclear Shielding Supplies)
High Density Concrete w/ AggregateNuclear Shielding Supplies and Services (NSS)
Concrete/Hematite aggregate shielding blocks – HD (3.8-5.7 g/cc) - Hematite (Fe2O3): Coarse [1” 3/8”] & Fine [3/8” 100 mesh] components
Established history of use at reactors and accelerators - Ontario Hydro (20 yrs, P.Mukherjee: Study of long-term effect on HD concrete at reactors) - BNL AGS (ilmenite, roof beams: 33 ton, blocks: 21, 11, 0.5 – 2 ton) - SNS Tunnel (hematite, 3.85g/cc, poured in place, 2000 m3) - TRIUMF
NSS has worked with Ellis-Don, Burnco, LaFarge
Used in both radiation & non-radiation applications: - high density radiation shielding - linear accelerator vaults & treatment rooms - high dose rate HDR rooms - mass concrete projects - high density concrete applications columns - gravity seawall, coastal protection & breakwater structures - bridge counterweights - ballast for ocean vessels and off shore platforms - noise and vibration dampening
Coarse Hematite
Fine Hematite
Charles River Suspension Bridge in Boston, MA
NSS HD-concrete (Non-radiation Applications)
HD-concrete Back-spans
Breakwater Structure Utilizing High Density Concrete
NSS HD-concrete (Non-radiation Applications)
EXTRA
2011 2015201420132012 2016 2017ACTIVITY
J A J OJ A J O J A J OJ A J O J A J OJ A J O J A
Schedule( 2010-2016 )2011 2015201420132012 2016 2017
Cleanup M11,1A/1B roof-beamDismantle PIENU & M13-DS
MESON HALL (& Vault):
Core M13 I-block
Shielding
UCN APPARATUS:Spallation Target & R/HUCN Source
BEAMLINE 1U:Kicker
SeptumDipoleBeamline (incl Quads, PS,…)
Design & Review Order/Fabricate/Deliver
Test
Test
Order/Mod
Order/Fabricate
Design & Review
Design & Review Order/Fabricate InstallTest
Specify/Conceptual design
Design/Fabricate InstallUnInstall
Procure shielding blocksDesign & Review Install
COMMISSION @ TRIUMFBeamline Commissioning
HELIUM LIQUEFIER:
Upgrade He Liquefier System
He Liquefier SystemProcure
UCN Source Commissioning
Install/Test & Run @ RCNP
Procure/Install
Install
Kicker Ceramic Beamtube InstallDesign/Order Fabricate
Install
Test
MILESTONES Shutdown Activities Activities Elsewhere(KEK, RCNP, CERN, Acsion)
Non-Shutdown Activities
Mod. 1VQ4/Q5; BL1V & Shld
InstallInstall
Install
Dismantle M13-US, Mod.Shld
UCN Schedule (Draft)
Design/Order/Fabricate Test
Install
Install
Design/Fabr
UCN Installation Schedule
N
2014 Shutdown
2015 Shutdown
2015 Non-Shutdown& 2016 Shutdown