Transcript ppt

IFE Plant Structural
Concepts Including
Shielding and Optical
Stability Requirements
Thomas Kozub, Charles Gentile, Irving Zatz - PPPL
HAPL
Overview
• Conceptual Development of an Integrated IFE
Facility Structural Design
• Incorporates Several Interconnected Design
Requirements:
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Basic Structure for Facility Core
Provide Stable Platform for Optics
Provide Necessary Shielding
Incorporate Methods for Plant Servicing
Meet all Regulatory Requirements
• All Elements are Integrated into an Single
Efficient Design
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HAPL
Conceptual Structural Design
(with current MI core design)
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View with Dome and Outer Wall Removed
HAPL
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IFE Plant Model Section Views
HAPL
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Generic Structural Design
HAPL
• Major facility dimensions are fixed as
determined by optical geometry and shielding
requirements
• Any reactor chamber core design that fits
within the 40m diameter bio-shield can be
accommodated with this design
• Integrated multifunctional use of components
to efficiently meet multiple requirements
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Fundamental Design
HAPL
• The basic design is very simple, a combination of
spheres and cylinders. The inner most concrete
structural component is the spherical “bio-shield”
which contains and supports the reaction chamber
and all associated components. The bio-shield is
contained within a larger structural sphere composed
of the interconnected GIMM outer supports struts and
connected to the bio-shield through the GIMM
shielding units. This spherical GIMM shield support
structure is integrated into a series of cylinders
carrying the load to the foundation. These cylinders
are interlinked with radial arches.
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Fundamental Design
HAPL
• For the tulip magnetic intervention
concept, the suggested vessel chamber
is a cylinder with hemispherical ends.
This geometry will contain all necessary
core components while minimizing
vacuum volume and will fit completely
through the service opening.
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Analysis Methodology
HAPL
• Optimize the static structural design to withstand
dead loads and mechanical loads.
• Perform a modal and, if necessary, a frequency and
transient analysis to determine the structural
adequacy of the design subjected to dynamic loads.
• If necessary, optimize the design of GIMM and other
relevant components to assure performance will be
within the specified displacement and vibration
criteria.
• Optimize material utilization and function.
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HAPL
FEA Model
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Optical Platform Stability
HAPL
• Design Requirements:
– Static support of the GIMM structures to the facility's
foundation.
– Structural elements to maintain stability and alignment within
the prescribed tolerances of the optical components.
– A GIMM base that provides a mirror surface flatness to a
quarter wavelength.
– Elimination of high frequency vibration at GIMM that is
beyond the dynamic tracking response of the steering
mirrors.
– Methods for mounting the GIMM within the vacuum beam
duct at the several various required orientations.
– Necessary features for the installation, adjustment, servicing
and replacement of the GIMM components.
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Current GIMM Geometry
HAPL
Drawing by Malcolm McGeoch
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GIMM Structural Shielding Block Unit Section
HAPL
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HAPL
GIMM Vibration Isolated Base Support
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GIMM Shield Units form an Integrated Structural Component
of the Facility Providing the Dual Functions of Load carrying
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structure and shielding
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HAPL
Sources of Vibration
• Reducing the sources of vibration to an
minimum is as important as the attenuation of
vibration.
• Sources of vibration grouped by strength of
coupling to the GIMM:
– Sources acting directly on the GIMM.
– IFE Process sources acting on the central core
structure.
– Facility and other sources dispersed throughout
the plant.
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Sources of Vibration Acting Directly on the
GIMM
HAPL
• Thermal shock from target detonation
– Impulse at rate ~5Hz
• Thermal shock from laser pulse
– Impulse at rate ~5Hz
• Flow of GIMM coolant
– Continuous source
• Electromagnetic effects
– To be determined
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IFE Process Sources of Vibration Through the
Facility Structure
HAPL
• Target detonation impulse
– Ion, radiation and thermal impulse at ~5Hz
• Magnetic Intervention field pulse
– Field force response into structure at ~5Hz
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Facility and Other Sources of Vibration
Rotating machinery: pumps, motors, etc.
Valves operating
Fluid flow through pipes
Transformers and other electrical devices
Elevators, cranes, trucks, doors
External sources through foundation
Atmospheric and Seismic
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HAPL
Primary Servicing Design
• Dome incorporates a large crane with a 1500
ton capacity (Typical “ship yard” type)
• Upper level platform for locating large service
components of up to 1500 ton each
• Upper four GIMM shield units are removable
• Bio-Shield incorporates a 22m removable plug
for vessel access
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HAPL
Example illustrations with and without
removable core components
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Major Service Loads
(Current MI Design)
Mirror Shield Unit
Bio-Shield Plug
Vessel Dome
Vessel Cylinder
MI Core Components
1200 ton
1100 ton
500 ton
1000 ton
<500 ton each
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HAPL
Conclusions
• This design strategy provides a scalable and
flexible approach to meeting the structural
requirements of an evolving project.
• This design efficiently incorporates the
required shielding materials into the core
structure providing increased stability and
functionality
• This design rigidly binds together critical
components and infrastructure while
minimizing the effects vibration.
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HAPL
Future work
• Complete static load and vibration mode finite
element analysis
• Optimization and volume reduction of
structural elements
• GIMM mounting:
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Vibration isolator design
Refinement of the GIMM shield units
Cooling methods minimizing vibration
Servicing features and details
• Integrated facility structural details
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