Draft Details
- Design requirements for concrete containment s...
- Draft Standard
- Legal Notice for Draft Standards
- Preface
- + 1 Scope
- 1.1 General
- 1.2 Application
- 1.3 Terminology
- 2 Reference publications
- + 3 Definitions, symbols, and abbreviations
- 3.1 Definitions
- 3.2 Symbols
- 3.3 Abbreviations
- + 4 General requirements
- + 4.1 Objectives
- 4.1.1 Design of containment structures — Genera...
- 4.1.2 Design of containment structures — Design...
- + 4.2 Requirements
- 4.2.1 General
- 4.2.3 Applicable CSA nuclear standards
- 4.2.4 CSA A23.3
- 4.3 Alternative design methods
- 4.4 Openings and penetrations
- 4.5 Attachments
- + 4.6 Instrumentation
- 4.6.1 Instrumentation provisions
- 4.6.2 Instrumentation compliance
- + 4.7 Aging management
- 4.7.1 Design margins
- 4.7.2 Aging management in design
- 4.7.3 Stressors and operating conditions
- 4.7.4 Time-limited aging analyses (TLAAs)
- + 5 Details of reinforcement
- + 5.1 General
- 5.1.1 CSA A23.3 requirements
- 5.1.2 Bending or straightening of bars partiall...
- 5.2 Concrete protection for reinforcement
- + 5.3 Continuity of reinforcement
- 5.3.1 Construction access openings and recesses...
- 5.3.2 Permanent openings and recesses
- + 5.4 Reinforcement for crack control
- 5.4.1 General
- 5.4.2 Minimum reinforcement
- 5.4.3 Clear cover for reinforcement
- 5.4.4 Non-prestressed reinforcement
- + 6 Analysis and design
- + 6.1 General
- 6.1.1 CSA A23.3 requirements
- 6.1.2 Design approach and analysis
- 6.1.3 Physical models
- 6.1.4 Computer programs
- 6.1.5 Ultimate pressure capacity (UPC)
- 6.1.6 Design provisions for impulsive and impac...
- 6.2 Material strength
- 6.3 Loading
- 6.4 Beyond design basis
- + 6.5 Foundations
- 6.5.1 General
- 6.5.2 Potentially liquefiable soil strata
- 6.5.3 Effects of fluctuating groundwater
- + 6.6 Structures and elements
- 6.6.1 Separation of containment structures from...
- 6.6.2 Effects of deformations
- 6.6.3 Interaction between containment structure...
- 6.6.4 Considerations
- 6.6.5 Effects at openings or penetrations
- 6.6.6 Penetration assemblies
- 6.6.7 Steel structure attachments on metal line...
- + 7 Loads, load combinations, and load factors
- 7.1.1 CSA N287.1 requirements
- 7.1.2 Load combinations and load factors
- 7.1.3 Unfactored loads
- + Table 7.1
- 7.1.4 Determination of loads
- 7.1.5 Transient differential pressures
- 7.1.6 Impact loads from tornado-generated missi...
- 7.1.7 Pipe reaction and jet impingement
- 7.1.8 Additional postulated loads
- + 7.2 Loads induced by thermal effects
- 7.2.1 General
- 7.2.2 Cracked section properties
- + 7.3 Temperature limitations
- 7.3.1 Maximum temperature limits
- 7.3.2 Special measures
- 7.3.3 Temperature limits exceeding Clause 7.3.1...
- 7.3.4 Temperature limits exceeding Clause 7.3.1...
- + 8 Stress limits and strength
- 8.1 CSA A23.3 requirements
- + 8.2 Flexure and axial loads
- + 8.2.1 Stress limits in service load category
- 8.2.1.1 Unfactored service loads
- 8.2.1.2 Factored loads
- 8.2.1.3 Maximum permissible stresses in concret...
- 8.2.2 Strain limits under factored loads for al...
- + 8.3 Shear and torsion
- + 8.3.1 General
- 8.3.1.1 Radial shear
- 8.3.1.2 Tangential shear
- 8.3.1.3 Torsional effects
- 8.3.2 Tensile strains in shear and torsion rein...
- + 9 Development and splices of reinforcement
- + 9.1 General
- 9.1.1 CSA A23.3 requirements
- 9.1.2 Hooks, bends, or mechanical splices
- 9.1.3 Special anchorages
- 9.1.4 Tension-carrying mechanical splices or we...
- + 9.2 Welded splices and welded rebar connections...
- 9.2.1 Positioning requirements
- 9.2.2 Design requirements
- 9.2.3 Compliance with CSA W186
- + 9.3 Mechanical splices
- + 9.3.1 General
- 9.3.1.1 Design
- 9.3.1.2 Type and arrangement
- 9.3.1.3 Staggering
- 9.3.1.4 Split sleeves
- + 9.3.2 Design requirements
- 9.3.2.1 Design strength
- 9.3.2.2 Redundancy
- 9.3.2.3 Staggering
- 9.3.2.4 Compressive stress increase in adjacent...
- 9.3.2.5 Creep in splices
- Figure 9.1
- Figure 9.2
- + 10 Prestressed concrete
- 10.1 CSA A23.3 requirements
- 10.2 Concrete tensile strength exclusion
- + 10.3 Permissible stresses
- 10.3.1 Service load category
- 10.3.2 Abnormal/environmental load category
- 10.4 Loss of prestress
- 10.5 Anchorages
- + 11 Seismic design
- + 11.1 General
- 11.1.1 CSA A23.3 requirements
- 11.1.2 Structural response
- 11.1.3 Reinforcement detailing
- 11.1.4 Seismic ground motions for SOEs, SDEs, a...
- 11.1.5 Notation and terminology
- + 11.2 Analysis
- 11.2.1 Dynamic analysis
- 11.2.2 Computation of seismic forces
- 11.2.3 Interaction of elements
- + 11.3 Frame members subjected to flexure
- 11.3.1 CSA A23.3 requirements
- 11.3.2 Transverse reinforcement requirements
- 11.4 Frame members subjected to flexure and axi...
- 11.5 Frame joints
- + 11.6 Walls, slabs, shells, and domes
- 11.6.1 Minimum reinforcement
- 11.6.2 Flat shear walls
- 11.6.3 Flat slabs
- 11.6.4 Shear strength of curved shells and dome...
- + 12 Nonmetallic liner systems and joint sealants...
- + 12.1 General
- 12.1.1 Classification of nonmetallic liners
- 12.1.2 Rigid-type liners
- 12.1.3 Elastic-type liners
- 12.1.4 Sealing of concrete joints
- 12.1.5 Service life of nonmetallic liners
- + 12.2 Design requirements
- 12.2.1 Concrete tensile stress for rigid-type l...
- 12.2.2 Maximum theoretical crack widths for ela...
- 12.2.3 Calculation of crack width
- + 13 Metallic parts
- 13.1 Objective
- + 13.2 General
- 13.2.1 CSA S16 requirements
- 13.2.2 CSA N285.0/N285.6 series requirements
- 13.2.3 Load factors
- 13.2.4 Reduction factors
- + 13.3 Metallic liners
- + 13.3.1 General
- 13.3.1.1 Exclusion of structural capacity
- 13.3.1.2 Resistance to imposed loads and deform...
- 13.3.1.3 Welding
- 13.3.1.4 Brackets and attachments
- 13.3.1.5 Penetration assemblies
- + 13.3.2 Analysis
- 13.3.2.1 General
- 13.3.2.2 Deviations in liner geometry
- 13.3.2.3 Brackets and attachments
- 13.3.2.4 Penetration assemblies
- + 13.3.3 Design requirements
- 13.3.3.1 General
- 13.3.3.2 Service load category
- 13.3.3.3 Liner strain limits
- + Table 13.1
- + 13.3.4 Anchorage design
- 13.3.4.1 General
- 13.3.4.2 Considerations
- + 13.3.5 Welding
- 13.3.5.1 CSA W59 requirements and exceptions
- 13.3.5.2 Periphery welds of liner plates
- 13.3.5.3 Stiffeners
- 13.3.5.4 Compliance with CSA W47.1
- 13.3.5.5 Compliance with CSA W59
- + 13.4 Embedded parts
- + 13.4.1 General
- 13.4.1.1 Deflection limits
- 13.4.1.2 Anchors
- 13.4.1.3 Moving loads
- + 13.4.2 Allowable stresses and load factors
- 13.4.2.1 Allowable stresses
- 13.4.2.2 Load factors
- + Table 13.2
- + 13.4.3 Design of welded joints
- 13.4.3.1 General requirements
- 13.4.3.2 Waiving of restriction on types of wel...
- + 13.5 Seal welds
- + 13.5.1 General
- 13.5.1.1 Applicable requirements
- 13.5.1.2 Fabrication drawings
- 13.5.2 Classification
- + 13.5.3 Design requirements
- 13.5.3.1 Types of seal welds
- 13.5.3.2 Continuous seal welds
- 13.5.3.3 Thickness of materials joined by seal ...
- + Table 13.3
- 13.5.3.4 Minimum weld size
- Table 13.4
- Figure 13.1
- Figure 13.2
- Figure 13.3
- + 14 Anchorage
- 14.1 Objective
- + 14.2 General
- 14.2.1 Anchor and anchor groups
- 14.2.2 Post-installed anchors
- 14.2.3 Support of seismically qualified equipme...
- 14.2.4 Support of nuclear class equipment
- 14.2.5 Support of vibrating or rotating equipme...
- 14.2.6 Anchorage systems
- 14.2.7 Anchor channels and post-installed ancho...
- + 14.3 Design requirements for concrete anchorage...
- 14.3.1 General
- 14.3.2 Adhesive anchors
- + 14.3.3 Shear
- 14.3.3.1 Transfer of shear from anchor to concr...
- + 14.4 Design requirements for steel embedments
- 14.4.1 Factored resistance
- 14.4.2 Cross-sectional area of threaded anchors...
- + Annex A (informative)
- + A.1 Summary
- A.1.1 Basis of load combinations and load facto...
- A.1.2 Intent
- A.1.3 Design requirements
- + A.2 Load categories and load factors
- A.2.1 General
- A.2.2 Loads in the service load category
- A.2.2.1 General
- A.2.2.2 Limiting stresses for reinforcing steel...
- A.2.2.3 Load factors
- A.2.3 Loads in the abnormal/environmental load ...
- A.2.3.1 General
- A.2.3.2 Leakage rate
- + A.3 Load combinations
- A.3.1 Service load category
- A.3.1.1 General
- A.3.1.2 Construction load combinations
- A.3.1.3 Test load combinations
- A.3.1.4 Normal load combinations
- A.3.2 Abnormal/environmental load category
- A.3.2.1 Abnormal load combinations
- A.3.2.2 Environmental load combinations
- A.3.2.3 Abnormal/environmental load combination...
- + Annex B (informative)
- + B.1 General
- B.1.1 Scope
- B.1.2 Impulsive loads
- B.1.3 Impactive loads
- + B.2 Design criteria
- B.2.1 General
- B.2.2 Material properties
- + Table B.1
- B.2.3 Shear strength
- B.2.3.1 Flexure-controlled elements
- B.2.3.2 Punching shear, reaction shear, and per...
- B.2.3.3 Shear requirements
- B.2.4 Deformation limits
- B.2.4.1 General
- B.2.4.2 Limit design method
- B.2.4.3 Response of structural elements or sect...
- + Table B.2
- B.2.5 Special requirements
- B.2.5.1 Resistance for impulse loads
- B.2.5.2 Reinforcement for beams
- B.2.5.3 Continuity of tension reinforcement
- B.2.5.4 Vertical reinforcement in columns
- B.2.5.5 Confinement reinforcement in columns
- B.2.5.6 Volumetric ratio for spiral reinforceme...
- B.2.5.7 Rectangular hoop reinforcement
- B.2.5.8 Special reinforced concrete design
- B.2.5.9 Impact load location
- B.2.5.10 Input parameters and acceptance criter...
- + B.3 Analysis and design for impulsive loads
- B.3.1 Method of analysis
- B.3.1.1 Dynamic analysis
- B.3.1.2 Equivalent static load approach
- B.3.1.3 Short-duration loads
- B.3.1.4 Time-history dynamic analysis
- B.3.2 Concrete stiffness
- + B.4 Analysis and design for impactive loads
- B.4.1 General
- B.4.2 Local effects
- B.4.2.1 General
- B.4.2.2 Punching shear design
- B.4.2.3 Empirical formulas
- B.4.2.4 Resistance to perforation and penetrati...
- B.4.3 Overall effects
- B.4.3.1 Deformation characteristics of missile ...
- B.4.3.2 Conservation of momentum and energy
- B.4.3.3 Detailed nonlinear analysis
- B.5 Load combination
- + Annex C (informative)
- C.1 General
- + C.2 Containment capacity
- + C.2.1 Prediction method
- C.2.1.1 General
- C.2.1.2 Finite element modelling
- C.2.1.3 Dynamic effect
- C.2.1.4 Incremental loading
- C.2.1.5 Failure criteria
- + C.2.2 Material properties
- C.2.2.1 Concrete
- C.2.2.2 Steel
- C.2.3 Accuracy of analysis
- + C.3 UPC assessment
- C.3.1 Safety margin
- C.3.2 Containment failure mode
- C.3.3 Containment penetrations and extensions
- C.4 Documentation
- Table C.1
- Annex D (informative)
- + Annex E (informative)
- + E.1 General
- E.1.1 Design of containment structures
- E.1.2 Structural integrity and leak-tightness o...
- E.1.3 Structural integrity margin assessment
- E.1.4 Acceptable structural behaviour and desig...
- E.1.5 Acceptance criteria
- + E.2 Loads and load combinations
- E.2.1 General
- E.2.2 DEC loads required at minimum
- E.3 Design consideration
1.1 General
This Standard specifies requirements for the design of concrete containment structures , and addresses their beyond design basis assessment. Concrete containment structures include the following structural and non-structural elements:
a) concrete;
b) reinforcement (pre-stressed and non-pre-stressed);
c) steel (e.g., liner, embedded parts, anchors);
d) non-metallic liners and coating systems;
e) joint sealants and water stops; and
f) elements necessary to support the containment structure (e.g., foundations).
1.2 Application
This Standard is used in concert with the other standards of the CSA N287 series of Standards.
This Standard is applicable to new nuclear power plants’ concrete containment structures to be built in Canada. Application of the Standard to concrete containment structures to be built outside Canada is subject to approval of the authority having jurisdiction (AHJ).
The application of the Standard to existing or operating nuclear power plants is as agreed upon by the owner/operating organization and the AHJ.
1.3 Terminology
In this Standard, “shall” is used to express a requirement, i.e., a provision that the user is obliged to satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised but not required; and “may” is used to express an option or that which is permissible within the limits of the standard.
Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.
Notes to tables and figures are considered part of the table or figure and may be written as requirements.
Annexes are designated normative (mandatory) or informative (nonmandatory) to define their application.
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