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1 Homes take DUSELNSF Preliminary Baseline Review - April 13-15, 2010
Bob AltesEngineer- ISE
Water Shield Engineering
Figure Courtesy PDG and LBNL
Homestake DUSEL FAARM AARM Collaboration Meeting
UC Berkeley
March 19-20, 2010
2 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
OverviewOverview
• Structure–Construction Concepts–Strength Issues
• Design issues• Fabrication• Transport• Assembly Integration
4850 Level Campus
7400 Level Campus
3 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
ConceptsConcepts
• Liquid/Metal Skin Modular–Structural modules-building blocks–Non structural modules-external structure
• Liquid/Plastic container modules–External structure requirements
4850 Level Campus
7400 Level Campus
4 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
Steel Modular Water ShieldSteel Modular Water Shield
• Six foot water shielded hot cell
• Chevron interfaces
• Mild steel-3/16in. Thick– Stiffened vertical plates for
Hydrostatic pressure &Gravity loads
• Inside dimensions– 5’x8’x12’
• Air vented to top row of tanks
4850 Level Campus
7400 Level Campus
5 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
Tank ModularTank Modular
4850 Level Campus
7400 Level Campus
6 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
Steel modular Water ShieldSteel modular Water Shield
• 6 foot water shielded facility
4850 Level Campus
7400 Level Campus
7 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
Concepts-Cont.Concepts-Cont.
• Plastic Shielding–Type of material and implementation method–Availability–Castings
• Cast Block modules• Panels (thick) built-up from thinner plates or castings
–Sprayed in place• Probably less dense than cast material• Possible EH&S restrictions
–External structural requirements
7400 Level Campus
8 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
Acrylic Panel ShieldAcrylic Panel Shield• Concept
4850 Level Campus
7400 Level Campus
9 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
Strength IssuesStrength Issues
• Walls–Vertical and Lateral stability –Bracing requirements
• Roof–Design for shielding wt. plus ancillaries–Tensile/compression and shear stress–Lateral stability-buckling–More challenging for plastic
• Cavity floor–Loading/stiffness requirements–Minimize mass of less radio pure materials
10 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
Cavity Floor ConceptCavity Floor Concept
• Removable Panels– Like Computer room floor– Box construction– Face thickness to support
Concentrated loads– Web for support of
Distributed Loads• Box support structure below
Panels-Stiff• Piers below stiff support
structure – Shimmed/grouted to module
floor
4850 Level Campus
7400 Level Campus
11 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
Design for minimum “shine”Design for minimum “shine”
• Water/Steel or plastic containment Modules–Walls
•Venting and Head issues•Stepped horizontal joints
–Metal/metal, plastic to plastic gaps–Air voids–Hydrogenous thickness
•Roof–Stepped vertical joints–Hydrogenous thickness
•Utility penetrations
4850 Level Campus
7400 Level Campus
12 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
Tank InterfacesTank Interfaces
• Horizontal interfaces– Metal/metal on shoulders-tolerances– Air removal on flat headers difficult– Possible hydrogenous 1/3-2/3 t
• Chevron Interfaces– Metal /metal contact through
interface– Air removal easy-anything over
3 degrees good– Hydrogenous greater than ½ t
4850 Level Campus
13 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
Tank InterfacesTank Interfaces
• Vertical Interfaces– Metal to metal on shoulders
and lower vertical surfaces
– Clearance on upper vertical surfaces
– Clearance gaps filledwith plastic plate/sheet (Polyethylene for example)
– Hydrogenous shieldingt/2 or greater in joint region
14 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
Fabrication and TransportFabrication and Transport
Fabrication Materials and Equipment Transport Rely on 18000 kg (18 Ton) Yates Super Cage
Dimensions: Height 4.9m,16 ftLength 4.1m,13.4ftWidth 3.2m,10.5ft
4850 Level CampusSuper CageAuxiliary Hoist
15 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
Fabrication-cont.Fabrication-cont.
• Metal modules•Fabrication at 4850 level
–Plate and equipment size limits–Where?–Quality Control and EH&S issuesoMaterial handlingoWeldingoChemical cleaning and passivation type processes
•Vendor surface shops–Module finish size limits
• Structural Elements•Vendor surface shops•Yates lift limited (same as raw stock)
16 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
Fabrication-cont.Fabrication-cont.
• Plastic modules•Plastic Panels
–Vendor surface shopsoCastingoMachining and module assembly /disassemblyoShipping
•Module assembly–Components and assemblies to 4850 –Yates size limit –Assembly in module
4850 Level Campus
7400 Level Campus
17 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
Assembly IntegrationAssembly Integration
• Scheduling by module occupants–Staging area and crane use
• FAARM assembly plans–Water shield–Immersion tank –Ancillary equipment
• Cranes rigging and special fixtures–Module 30-40 ton monorail and 20 bridge –Small crane inside the water shield–Experiment supplied fixtures and rigging
• Many design related issues here 7400 Level Campus
18 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
Module Space/Crane Issue Module Space/Crane Issue
• Layout assumptions– Design of Monorail can be brought back to 2m– Bridge crane available
During assembly
• Risk– Assembly scheduling
For 3 experiments– Bridge crane may be
Blocked by other users– Agreements necessary
among module occupants
19 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010
Shielding LiquidShielding Liquid
• Processing system
• Breech containment–Processing system–Shield volume 4850 Level Campus
7400 Level Campus
20 Homestake DUSELAARM Collaboration Meeting - March 19-20, 2010