Transcript Structural Analysis of a Nuclear Fuel Handling Machine Overview

Westinghouse Non-Proprietary Class 3
© 2012 Westinghouse Electric Company LLC. All Rights Reserved.
Structural Analysis of a Nuclear Fuel
Handling Machine Overview
By: Steve Sherfey, Westinghouse Electric Company LLC
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Westinghouse Non-Proprietary Class 3
© 2012 Westinghouse Electric Company LLC. All Rights Reserved.
Agenda
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Abstract
Analytical Model
Hoist & Hook Model Configurations
Acceptance Criteria and Codes
Service Condition
Seismic Condition
Special Modeling Technique
Primary and Secondary Evaluations
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© 2012 Westinghouse Electric Company LLC. All Rights Reserved.
Abstract
• Nuclear Power Plants contain Fuel Handling Machines
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(FHMs) for moving fuel
Rail Mounted, Motorized, and Computer controlled
Very top heavy
Very difficult to qualify
Engineers must use a special modeling technique for
qualification
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Analytical Model
Main Hoist
Upper Bridge
Lower Bridge
SFP Hoist
Upper Rail
Lower Rail & Wheel
Power Center
Motor
Lower Rail & Wheel
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Analytical Model - Inputs
• Design Drawings
• Boundary Conditions
• Material and Sectional Properties of Structural Components
• Proper member releases at bolted connections
• Response Spectra for the SSE Event
• Create analytical model using Structural Analysis Computer
Code such as GTStrudl
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Analytical Model – Material Properties
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Analytical Model – Sectional Properties
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Analytical Model
Response Spectrum (X Direction)
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Analytical Model
Response Spectrum (Y Direction)
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Analytical Model
Response Spectrum (Z Direction)
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Analytical Model
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Hoist & Hook Model Configurations
Main Hoist at Mid Span,
SFP Hoist at North End.
Main Hoist at North End,
SFP Hoist at South End.
Main Hoist at North End,
SFP Hoist at Mid Span.
N
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Acceptance Criteria and Codes
• Plant Design Specification & Response Spectra
• AISC Manual of Steel Construction, Allowable Stress
Design
• ASME NOG-1, Rules for Construction of Overhead and
Gantry Cranes
• ASME B&PVC Code, Section III, Division 1, Sub-Section
NF
• CMAA-70, Crane Manufacturers Association of America,
“Specifications for Top Running Bridge & Gantry Type
Multiple Girder Electric Overhead Traveling Cranes”
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Service Condition
• Analyzed for all service loads without seismic excitation and
qualified per CMAA-70
• Loadings shall include Inertia of mass loads from movement
of Crane, Trolley, Hoist, and Lifted Load
• Loadings due to Wind, Skewing, Collision, Platform, and
maximum critical hook loads shall be considered when
applicable.
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Seismic Condition
• Analyzed for all normal operation deadweight loads acting
simultaneously with seismic excitation from Safe Shutdown
Earthquake (SSE)
• Response spectrum method shall be used
– Proper Combination of modes of seismic vibration
– Proper Combination of directional seismic responses
– Proper Damping factors
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Special Modeling Technique
• Sliding or rolling must be considered to prevent overturning
• Force required to cause sliding or rolling must be calculated
• Each crane drive wheel is restrained in the movement
direction with a specified spring stiffness
• The spring stiffness is derived by iteration
• An initial stiffness is assumed; the value is changed &
analysis rerun until the wheel seismic load equals the
sliding/rolling force.
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Required Crane Evaluations
Primary Evaluations:
Wheel Reactions, Displacements, Accelerations, Structural
Steel Stresses, Plate Element Stresses
Secondary Evaluations:
Welds, Beam Connection Plates, Beam Flange/Web
Deformations, Stiffener Plates, Bolts, and Wire Ropes
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Some Typical Items Being Evaluated
TUBE ON TUBE
CONNECTION
M SHAPE TO W SHAPE
CONNECTION
THE END
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Bolt Evaluations
• The maximum forces and moments for each connection
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type can be extracted from GTStrudl
30-40 types of major bolted connections in the FHM
Can be grouped in 10-15 typical connection types
Each connection type has a different bolted configuration
pattern due to size, number, and spacing of bolts
Each configuration has different sectional properties
required for calculating max shear and tension stresses
Bolts must be qualified to applicable code
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Slack Rope Evaluations
• If the lifted load has an upward seismic acceleration greater
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than 1 g, the hoist wire rope may need to be evaluated for
the slack rope condition
ASME NOG-1 provides design guidance for performing this
evaluation
The maximum slack rope allowable is based on a
percentage of the rope breaking strength
A non-linear time history analysis is normally required for
performing the slack rope analysis
The analysis is only used for evaluating the rope for the
most probable lifted load condition
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Structural Analysis of a Nuclear Fuel Handling Machine
THE END
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