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Safety design process and implementation of
SDC for demonstration SFR
Fourth Joint IAEA-GIF Technical Meeting/Workshop on SAFETY OF SODIUM-COOLED FAST REACTORS
10 – 11 June 2014, Vienna
Outline
• Utility requirements
• Safety design process
• Implementation of SDC
2
Utility requirements
Safety Performance
3
•DiDSafety
•Plant Characteristics
•Transient response
•Reliability and availability
•Operability and maintainability
•constructibility
Performance
4
Utility requirements
G-III ALWR safety requirements
5
DiD
• Accident resistance
• Core damage
prevention
• Mitigation
LDB
• Regulatory imposed
margin
• In-service
inspection and
testing
• Safety system to
meet regulatory
requirements
• Containment and
associated systems
SMB
• Increased margin
• Simplicity
• System and
component
reliability
• Safety system
features for
investment
protection
• Containment
performance during
severe accident
Comparison between SFR and G-III
6
G-III ALWR SFR
Accident resistance
�License design basis
�Safety margin basis
√
Core damage prevention
�License design basis
�Safety margin basis
√
Mitigation
�License design basis
�Safety margin basis
√
For LWR, the reactor core shall be capable of
withstanding SBO for at least 8 hours without fuel
damage.
Outline
• Utility requirements
• Safety design process
• Implementation of SDC
7
Safety design
• Safe design means the integration of control
measures in the design process to eliminate or, if
this is not reasonable practicable, minimize risks
to human and investment throughout the life of the
power plant being designed.
• Characteristics of Safety：
Industry field
A kind of process state
Relative safe
Coexist with risk
Dynamical standard
8
System safety
• The application of engineering and
management principles, criteria, and
techniques to optimize safety within the
constraints of operational effectiveness,
time, and cost throughout all phases of the
system life cycle.
9
Safety design approach
• Designers determine which hazards could
be present, the level of associated risk that
could constitute danger, and the controls
or measures to assure acceptable risk.
• A step - by - step procedure for solving
problems; a decision making process
which moves from the general to the
specific; an iterative process.
10
Safety design process
• The main task is to predict，evaluate and
control risk.
11
Risk
identifica
tion and
prediction
Safety
analysis
Schemes
and
measures
comparison
Evaluation
Decision
making
Safety design process
• Category of NPP safety
• Nuclear safety
• SSC safety
• Building safety
• I&C safety
• Utility safety
• Plant site safety
12
Safety design process
• Safety analysis method
• Failure Modes and Effects Analysis(FMEA)
• Hazard and Operability Studies(HAZOP)
• Fault Tree Analysis(FTA)
• Event Tree Analysis(ETA)
13
Safety design process• Failure Modes and Effects Analysis(FMEA)
14
Assessment format
Safety design process
15
Divide system
Risk
identification
and prediction
Safety analysis
Schemes and
measures
comparison
EvaluationMeasurement
Effect
analysis
Decision
making
An iterative process
Safety design process
16
Outline
• Utility requirements
• Safety design process
• Implementation of SDC
17
Implementation of SDC
• 1 meeting between CIAE and NNSA.
• One debate for sodium void coefficient
• GIF-SFR-SDC will be an important reference for
regulatory body and designers.
• For designers, SDC is a kind of requirements and
boundary.
18
•DiD
•GIF-SFR-SDC
•G-III or G-IV
Safety
•Plant Characteristics
•Transient response
•Reliability and availability
•Operability and maintainability
•Constructibility
Performance
19
Implementation of SDC
Top-tier design requirement is almost finished.
Pre-conceptual design of demonstration SFR
Containment
Coolant System
Reactor Core
20
Implementation of SDC
21
Reactor Core Coolant system Containment
Safety √ √ √
Plant
Characteristics
Transient
response
Reliability and
availability
Operability and
maintainability
Constructibility
Implementation of SDC
22
Reactor Core Coolant system Containment
Safety Criterion 43,
44, 45, 46
Criterion 47,
48, 49, 50, 51,
53
Criterion 54,
55, 56, 57, 58
Plant
Characteristics
√ √ √
Transient
response
√ √ √
Reliability and
availability
√ √ √
Operability and
maintainability
√ √ √
Constructibility √ √ √
Implementation of SDC
System design requirement is under development.
Thank you for your attention！
23