mechanical codes & standards: a path towards harmonization · mechanical codes & standards:...

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

Accelerating rise in world electricity consumption

Global consumption of electricity

3

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.


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)


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

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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.

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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


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.

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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.

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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)


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


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

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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.

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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

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Mechanical Codes & Standards: A path towards harmonization 17

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