mechanical codes & standards: a path towards harmonization · mechanical codes & standards:...
Post on 15-May-2018
248 Views
Preview:
TRANSCRIPT
Mechanical Codes & Standards:
A path towards harmonization
Dr. Andrew Wasylyk
Project Manager - CORDEL
6th June 2017
International Conference on Topical
Issues in Nuclear Installation Safety
The World Nuclear Association in Brief
• Founded in 2001 on the basis of the Uranium Institute [itself founded in 1975]
• International organization that promotes nuclear energy and supports the companies that comprise the global nuclear industry.
• Membership: encompasses all aspects of nuclear energy
• World's leading online news service on developments
related to nuclear power - Reaching 100,000 readers per
week
• Global partnership, committed to training and education,
of nuclear industry leaders
2
4
Harmony goal for new nuclear build is 1000 GW
GW TWh
2014 2050
0 0
200
400
600
800
25% of
generation
11% of
generation
1250
GW
10000
TWh
Additions
1000
GW
8000
TWh
Retirements
150 GW
396
GW 2411
TWh
1200
1000
11000
7000
5000
3000
9000
1000
Source: World Nuclear Association. Growth required for nuclear energy to supply 25% of electricity in 2050 under demand forecast of two-degree scenario (see IEA, 2015, Energy Technology Perspectives 2015. Assumption: 91% capacity factor
Mechanical Codes & Standards: A path towards harmonization
Harmonization of
Requirements
Harmonisation of regulatory requirements:
A framework or process by which difference countries
can achieve convergence and achieve consistent set of
regulatory requirements
Harmonisation of code requirements:
A framework or process by which different countries can
achieve convergence and a reconciliation of differences
with code requirements in order to ensure an acceptable
level of quality and safety in nuclear power plants.
Mechanical Codes & Standards: A path towards harmonization
Why Harmonisation
- acceleration of construction – effective lessons feedback and
clear understanding of requirements
- Increase cost effectiveness – economies of scale provided by
potential for fleet approaches
- Larger and more diverse supply chain – potential for
increased quality of components & enables development of new
technology and processes
- Increase in Safety - Sharing of experience and solutions
(regulators, operators and suppliers)
Mechanical Codes & Standards: A path towards harmonization
Codes vs. Standards
Codes Handbooks of instructions for design, constructions, inspections. Calculation methods
and tools are usually listed in the codes as well as industry practices. That is why
codes generally are regularly revised to take into account the progress of scientific
and technical knowledge. The codes generally refer to or specify the standards which
have to be applied. The main purpose of the codes is to protect public health, safety
and general welfare.
Example of codes: ASME, AFCEN, KTA, JSME, etc.
Standards Standards are commonly accepted requirements followed by the members of an
industry.
Example of Standards: ISO, ANSI, IAEA Standards
7
Mechanical Codes & Standards: A path towards harmonization
International Level: current status
IAEA:
• IAEA standards underpin safety in all countries, Applicable and internationally recognized set of Safety requirements
• Higher level in standards hierarchy, not enforceable
• Supplemented by enforceable national regulations
MDEP:
• Allows for the sharing of information between regulatory bodies currently licensing or planning to license a new nuclear power plant technology
• Allows participating regulatory bodies to publish common positions through issue specific cross-technology issues – these common positions are not enforceable
Industry:
• ISO/IEC: Publication of international industry standards – consensus based and reflect best international practices – large acceptance of international standards but not universally accepted.
• WNA CORDEL:
• Forum Stimulating a dialogue between the nuclear industry (including reactor vendors, operators and suppliers) and nuclear regulators on the benefits of achieving a worldwide convergence of reactor safety standards for reactor designs
• Contribute to international cooperation among national regulators in efforts to converge toward design standardization and harmonization of national regulatory regimes.
8
Mechanical Codes & Standards: A path towards harmonization 9
Mechanical Design Codes –
existing forums
Regulators: MDEP - CSWG
Canada, Finland, France, Indi, Japan, Russian Federation, South Africa, the UAE, The UK, the USA, China, and Sweden
Standard Development Organizations: SDO Board
ASME BPVC III div.1, AFCEN (RCC-M), KEA (KEPIC), JSME (S-NC1), CSA,(N285.0) NIKIET (PNAE-G7)
Industry: WNA CORDEL
The international voice of the industry promoting convergence of nuclear design codes
Interfaces with regulators, SDOs, vendors and industry experts
SDOs
Regulators Industry
Mechanical Codes & Standards: A path towards harmonization
The framework (1) - Defining
differences and similarities
A1 = Same Requirements classified as category A1 are considered to be technically identical.
A2 = Equivalent Requirements are considered to be equivalent when applying either code or standard, if compliance with the applied code or standard will also meet the requirements of the other code or standard.
B1 = Different – Not specified Requirements are considered to be different –not specified, if one code or standard includes requirements that the compared code or standard does not specify
B2 = Technically Different Requirements are considered to be technically different if either code requires something more or less than, or otherwise technically different from, the requirements imposed by the other.
10
Mechanical Codes & Standards: A path towards harmonization
The framework (2) - Definitions
Convergence – the process of establishing the same or equivalent
code requirements in order to increase the areas identified as
“same” or “equivalent,” as identified by the Standards Development
Organisations (SDOs) in their Code Comparison Report (ASME
STP-NU-051).
Reconciliation – the means to accept differences in code
requirements by justifying their acceptability.
Harmonisation – is a framework or process by which different
countries can achieve convergence and a reconciliation of
differences with code requirements in order to ensure an acceptable
level of quality and safety in nuclear power plants.
11
Mechanical Codes & Standards: A path towards harmonization
Model for Harmonization of Codes
Convergence (process to establish equivalent requirements)
Different
Equivalent
Equivalent
technical
administrative
not addressed Dif
fere
nce
s to
day
Reconciliation (process to reconcile differences)
Mechanical Codes & Standards: A path towards harmonization
Harmonization
Select topics with input from: - Industry (CORDEL)
- Regulators (MDEP-CSWG)
- SDOs (SDO Convergence Board
Convene group of experts from the industry to work within CORDEL MCSTF
Report current status of codes
propose harmonised rules
Define common Code Case
Mechanical Codes & Standards: A path towards harmonization
CORDEL MCSTF Projects
Finalised Projects
Certification of Non-Destructive Personnel – Published 2015 • Reviewed and currently being considered by SDO Board and MDEP CSWG
Comparison Report on Welding Qualification and Welding Quality Assurance – STP-NU-078 – Published 2016
• Has been submitted to SDO board and MDEP
On-Going Projects
Non-linear analysis design rules • Part 1: Code comparison – Published February 2017
• Part 2: Industry Practices – First draft available • Part 3: Benchmark – Initiating benchmark
Harmonisation of Fatigue Life Analysis Methods
• Part 1: Comparison of Pressure Vessel and Piping Fatigue Design Rules based on S-N (cyclic stress vs. cycles to failure) Approach – under drafting
• Part 2: Proposed Harmonized Pressure Vessel and Piping Fatigue Design Rules
• Part 3: Proposed Harmonized Fatigue Crack Growth Analyses • Part 4: Proposed Harmonized Environmental Effects on Fatigue and Fatigue Crack Growth
Analysis
14
Mechanical Codes & Standards: A path towards harmonization
General Remarks
• The differences between each code are not consistent throughout the codes used internationally
• These differences are due to the historical, cultural, social, industrial and regulatory differences of each country.
• Each code has been determined by each country to result in acceptably safe pressure boundary components when used in conjunction with that country's standard industry practice and regulations.
• Mixing different country’s code and standards requirements might be detrimental and should be carefully evaluated when attempted.
15
Mechanical Codes & Standards: A path towards harmonization
Take Away
• Harmonization is required for more efficient development of nuclear
• A common framework for harmonization has been developed:
Structured sharing of information
Common Definitions and understanding
Shared approach to harmonization
• Harmonization effort should progress on specific technical and administrative issues that have been identifies as a priority
16
top related