Draft Details
- General requirements for safety systems of nuc...
- N290.0
- Legal Notice for Draft Standards
- Preface
- + 1 Scope
- 1.1 Application
- 1.2 Companion documents
- 1.3 Terminology
- 2 Reference publications
- + Protection against Internal Hazards in the Des...
- 3.1 Definitions
- 3.2 Abbreviations
- + 4 General safety system requirements
- 4.1 General
- 4.2 Plant states
- Figure 1
- + 4.3 System operating states
- 4.3.1 General
- 4.3.2 Poised states
- 4.3.3 Safe operating envelope
- + 4.4 General design requirements
- 4.4.1 DBA
- 4.4.2 Minimum allowable performance standards
- 4.4.3 Separation
- 4.4.4 Safety margin
- + 4.4.5 Digital hardware and software qualificati...
- 4.4.5.1 Use of digital items
- 4.4.5.2 Cyber security requirements
- + 4.4.6 Complementary design features
- 4.4.6.1 Requirements
- 4.4.6.2 Impact on SSC functionality and perform...
- 4.4.6.3 Jurisdictional boundaries
- + 4.5 Reliability
- + 4.5.1 General
- 4.5.1.1 Reliability targets
- 4.5.1.2 Safety support systems
- 4.5.1.3 Methodology
- + 4.5.2 Reliability analysis
- 4.5.2.1 General
- 4.5.2.2 Systematic investigation of failure mod...
- 4.5.2.3 Periodic review
- 4.5.2.4 Maintenance of reliability analysis
- + 4.6 Separation and independence
- 4.6.1 Separation of systems
- 4.6.2 Separation requirements
- 4.6.3 Independence
- + 4.7 Single failure criterion
- 4.7.1 General
- 4.7.2 Systematic identification of potential si...
- 4.7.3 Prevention of single failures
- 4.7.4 Passive component exemption
- + 4.8 Fail-safe
- 4.8.1 General
- 4.8.2 Annunciation of failure to fail-safe on l...
- 4.8.3 Support system
- 4.9 Foreign material management
- + 4.10 Safety support systems
- 4.10.1 Safety support system capacity and relia...
- + 4.10.2 Power supply
- 4.10.2.1 Electrical power system requirements
- 4.10.2.2 Independence
- 4.10.2.3 Power interruptions
- 4.10.3 Instrument air supply
- + 4.10.4 Ventilation systems
- 4.10.4.1 Identification and measurement of radi...
- 4.10.4.2 Environmental controls
- 4.11 Pressure-retaining SSCs
- + 4.12 Instrumentation, control, and monitoring
- 4.12.1 General
- + 4.12.2 Selection of instrumentation
- 4.12.2.1 Operator interface
- 4.12.2.2 Environmental considerations
- 4.12.2.3 Instrumentation provision
- + 4.12.3 Instrumentation and control
- 4.12.3.1 Automatic control
- 4.12.3.2 Manual initiation
- 4.12.3.3 Alternative manual initiation
- 4.12.3.4 System logic
- 4.12.3.5 Instrument redundancy
- 4.12.3.6 Failure modes
- 4.12.3.7 Instrumentation measurement range and ...
- 4.12.3.8 Instrument loop uncertainties and erro...
- 4.12.3.9 Instrument loop response time
- 4.12.3.10 Testing and inspection program
- 4.12.3.11 Testing requirements
- 4.12.3.12 Maintenance capability
- 4.12.3.13 Calibration capability
- 4.12.3.14 Unavailability due to calibration
- 4.12.3.15 Selection of instrumentation and arch...
- + 4.12.4 System performance
- 4.12.4.1 Monitoring parameters
- 4.12.4.2 Selection of monitoring parameters
- 4.12.4.3 Location of channelized instrumentatio...
- 4.12.4.4 Monitoring of plant conditions of conc...
- 4.12.4.5 Displays of safety system variables
- 4.12.4.6 Annunciation of safety system operatio...
- 4.12.4.7 Monitoring during test state
- 4.12.4.8 Post-accident monitoring
- + 4.13 Equipment qualification
- + 4.13.1 General
- 4.13.1.1 Impact of equipment on safety system
- 4.13.1.2 Material selection
- + 4.13.2 Environmental qualification
- 4.13.2.1 General
- 4.13.2.2 Harsh environmental conditions
- 4.13.3 Seismic qualification
- + 4.13.4 Aging
- 4.13.4.1 Effects of aging and wear on SSCs impo...
- 4.13.4.2 Design margins for aging and wear mech...
- 4.13.4.3 Assessment of aging mechanisms
- 4.13.4.4 Aging management program
- + 4.13.5 Obsolescence
- 4.13.5.1 Component life and replicability
- 4.13.5.2 Obsolescence management program
- 4.13.6 Event-generated hazards
- 4.13.7 DECs
- + 4.14 Dynamic piping effects
- 4.14.1 Design in consideration of dynamic pipin...
- 4.14.2 Damage due to dynamic piping effects
- + 4.15 Human factors
- 4.15.1 Human factors design
- 4.15.2 Unavailability identification
- 4.15.3 Information displays
- 4.15.4 Indications and alarms
- 4.16 Fire protection
- 4.17 Environmental release
- 4.18 Baseline data
- + 4.19 System health monitoring
- 4.19.1 Health monitoring program
- 4.19.2 Elements of health monitoring program
- + 4.20 Operability
- 4.20.1 Unavailability of safety system
- 4.20.2 Shielding of SSCs
- 4.20.3 Inoperability/impairment of SSCs
- 4.20.4 Operator intervention
- 4.20.5 Clarity of need for operator action
- 4.20.6 Manual operation
- + 4.21 Maintainability
- 4.21.1 Maintenance of system
- 4.21.2 Maintenance at power
- 4.21.3 SSC maintenance
- 4.21.4 Design considerations for maintenance an...
- + 4.22 Maintenance program
- 4.22.1 General
- + 4.22.2 Condition monitoring
- 4.22.2.1 Condition monitoring program
- 4.22.2.2 Periodic inspection programs
- 4.22.2.3 Dormant equipment failure modes
- + 4.22.3 Maintenance
- 4.22.3.1 Safe state for maintenance
- 4.22.3.2 Post-maintenance testing
- + 4.23 Testing
- + 4.23.1 General
- 4.23.1.1 Frequency of safety system testing
- 4.23.1.2 Determination of testing frequency
- 4.23.1.3 Impact of testing
- 4.23.1.4 Safety system testing requirements
- 4.23.1.5 Quantified acceptance criteria
- 4.23.1.6 Alternative means of assuring system e...
- + 4.23.2 Functional testing
- 4.23.2.1 General
- 4.23.2.2 Functional test frequency basis
- 4.23.3 Post-maintenance testing
- + 4.23.4 Commissioning
- 4.23.4.1 General
- 4.23.4.2 Confirmation of electrical wiring desi...
- + 4.24 Sharing within a unit
- + 4.24.1 Shared SSCs
- 4.24.1.1 General
- 4.24.1.2 SSCs performing process and safety fun...
- + 4.24.2 Shared instrumentation
- 4.24.2.1 General
- 4.24.2.2 Instrumentation sharing between safety...
- 4.24.2.3 Design requirements for dual function ...
- 4.24.2.4 Provision and design of interfaces
- + 4.25 Sharing between units
- 4.25.1 Designing systems for multiple units
- 4.25.2 Plant initiating events
- 4.25.3 Consideration of common-cause events
- 4.25.4 System boundaries and interfaces in mult...
- 4.25.5 Life cycle of a multi-unit plant
- 4.25.6 Effects on SOE
- + 4.26 Documentation
- + 4.26.1 Design documentation
- 4.26.1.1 Design basis documentation
- 4.26.1.1.1 Retention and updating of design doc...
- 4.26.1.1.2 Documentation requirements
- 4.26.1.1.3 SSCs descriptions in design document...
- 4.26.1.1.4 Inclusions in design basis documenta...
- 4.26.1.2 Design requirements
- 4.26.1.3 Design description
- 4.26.1.4 Operating limits
- 4.26.1.4.1 Provision of system and component op...
- 4.26.1.4.2 Detailed operating limits
- 4.26.2 SOE documents
- 4.26.3 Operating documents
- 4.26.4 History docket(s)
- 4.26.5 Operating history
- + Annex A (informative)
- A.1 Introduction
- A.2 Failure modes
- A.3 Corrective techniques
- Table A.1
1.1 Application
This Standard applies to the design, qualification, installation, operation, maintenance, inspection, and documentation of the safety systems for new and existing water-cooled nuclear power plants.
Note: This Standard also applies to safety support systems as they relate to the safety systems covered by this Standard.
1.2 Companion documents
This Standard provides the general requirements for safety systems. This Standard is a companion document used in concert with CSA N290.1, CSA N290.2, and CSA N290.3, which outline system-specific requirements.
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 (non-mandatory) to define their application.
You may comment on any section of this document by clicking the “Submit Comment” link at the bottom of the relevant section.