IAEA/EPRI International Technical Meeting on Aging Management of Buried and Underground Piping and Tanks for Nuclear Power Plants
e-Doc 4532918 (PPT)
Seyun Eom and Blair Carroll Technical Specialist
John Jin Director
Canadian Nuclear Safety Commission
Aging Management of Buried and Underground Piping and Tanks for Nuclear Power Plants in Canada
The views expressed herein are those of the authors and do not represent official positions of the Canadian Nuclear Safety Commission
2
Presentation Outline
E-Doc# 4532918 IAEA/EPRI International Meeting on Aging Management of Buried and underground Piping and Tanks for Nuclear Power Plant October13, 2014 , Charlotte, the US
Introduction
• Canadian Nuclear Safety Commission (CNSC)
Status of Buried Pipe and Tanks in Canadian Nuclear Plants
Regulatory Framework
• Overview of CNSC Core Processes
• CNSC Safety Control Areas (SCAs)
Aging Management
• Overview of CNSC Regulatory Document, REGDOG-2.6.3
• Integrated Approach
• 9 Key Attributes in CNSC REGDOC-2.6.3
Canadian Standards Association (CSA) N285.4
• Overview
CSA N285.7
• Overview
• Risk Informed In-Service Inspection (RI-ISI)
• Risk Evaluation
Concluding Remarks
Canadian Nuclear Safety Commission (CNSC) - Overview
Canada’s nuclear watchdog
Quasi-judicial body
Independent of, but not isolated from, government
Our Mission Is Clear
• Regulate the use of nuclear energy and materials to protect the health, safety and security of persons and the environment
• Respect Canada’s international commitments on the peaceful use of nuclear energy
• Disseminate objective scientific, technical and regulatory information to the public.
E-Doc# 4532918 IAEA/EPRI International Meeting on Aging Management of Buried and underground Piping and Tanks for Nuclear Power Plant October13, 2014 , Charlotte, the US
E-Doc# 4532918 IAEA/EPRI International Meeting on Aging Management of Buried and underground Piping and Tanks for Nuclear Power Plant October13, 2014 , Charlotte, the US
Power Reactor Operating License (PROL) requires that licensees have programs to ensure Fitness for Service of Structures, Systems and Components (SSCs) in accordance with referenced CNSC regulatory documents and Canadian Standards Association (CSA) standards
REGDOG-2.6.3* on aging management is currently available. *supersedes RD-334 (2011)
CSA Standard N285.4, periodic inspection of nuclear power plant components, referenced in operating licences
Draft of CSA Standard N285.7 periodic inspection of CANDU nuclear power plant balance of plant pressure boundary systems and components currently issued for public review and comment
No buried or underground piping transporting radioactive substances in Canadian nuclear plants under normal operating conditions
Possible impact on nuclear safety due to degradation of buried pipe and tanks (i.e., some sections of Emergency Core Cooling (ECC) piping, main service water, fire protection piping, etc.)
Status of Buried Pipe and Tanks in Canadian Nuclear Plants
5
Overview of Regulatory Framework
E-Doc# 4532918 IAEA/EPRI International Meeting on Aging Management of Buried and underground Piping and Tanks for Nuclear Power Plant October13, 2014 , Charlotte, the US
Regulatory Framework
• Safety & Control Areas (SCAs), Licence Conditions
Regulatory Requirements & Guidance
• CNSC Regulatory Documents (REGDOCs) & Canadian Standards Association (CSA) Standards
14 SCAs used by CNSC staff across all regulated facilities and activities in a comprehensive framework to assess, evaluate, review, verify and report on performance of regulatory requirements
CNSC Safety and Control Areas (SCAs)
Functional Area Safety and Control Area
Management
1. Management Systems
2. Human Performance Management
3. Operating Performance
Facility and Equipment
4. Safety Analysis
5. Physical Design
6. Fitness for Service
Core Control Processes
7. Radiation Protection
8. Conventional Health and Safety
9. Environmental Protection
10. Emergency Management and Fire Protection
11. Waste Management
12. Security
13. Safeguards and Non-Proliferation
14. Packaging and Transport
SCAs particularly relevant
to Aging Management
6 E-Doc# 4532918 IAEA/EPRI International Meeting on Aging Management of Buried and underground Piping and Tanks for Nuclear Power Plant October13, 2014 , Charlotte, the US
Aging Management – Overview of REGDOC 2.6.3 (2014*) • CNSC’s adoption and adaptation of IAEA NS-G-2.12
Aging Management of Nuclear Power Plants (2009)
• Covers all stages of NPP lifetime, including design, construction, operation, Long Term Operation (LTO), safe storage and decommissioning
• Requirements for: – Integrated Aging Management Program
(Plant Level framework / governance) – Aging / Life Cycle Management Plans for specific
SSCs or specific aging degradation mechanisms – Safety Analysis and Risk Assessments to account
for cumulative effects of aging – Data and information collection for aging
management and to confirm safety analysis assumptions and acceptance criteria continue to be met
*supersedes RD-334 (2011) 7
E-Doc# 4532918 IAEA/EPRI International Meeting on Aging Management of Buried and underground Piping and Tanks for Nuclear Power Plant October13, 2014 , Charlotte, the US
Aging Management – Integrated Approach
8
`
Minimize
expected
degradation
Check for
degradation
Improve effectiveness
of aging management
programs
3. Operation/use of a
Structure/Component
Managing Aging Mechanisms
Operation according to procedures and technical specifications
Chemistry Control
Environmental Control
Operating History, including transient records
2. Development and optimization of activities for
aging management of a structure/component
Preparing, coordinating, maintaining and improving activities for aging management
Document regulatory requirements and safety criteria
Document relevant activities
Describe coordination mechanisms
Improve effectiveness of aging management based on current understanding, self-assessment and peer reviews
1. Understanding aging of a structure/
component
Key to effective aging management based on the following information:
Materials and material properties, fabrication methods
Stressors and operating conditions
Aging mechanisms
Sites of degradation
Consequence of aging degradation and failures
R&D results
Operational experience
Inspection/monitoring/maintenance history
Mitigation methods
Current status
Reliability
4. Inspection, monitoring and assessments of a
structure/component
Detecting and assessing aging effects
Testing and calibration
Pre-service and In-Service Inspection
Leak detection, vibration monitoring, etc.
Assessment of functional capability/fitness for service
Record keeping
5. Maintenance of a
structure/component
Managing Aging Effects
Preventive maintenance
Corrective maintenance
Spare parts management
Replacement
Maintenance history
Plan
Check
DoAct
Mitigate
degradation
E-Doc# 4532918 IAEA/EPRI International Meeting on Aging Management of Buried and underground Piping and Tanks for Nuclear Power Plant October13, 2014 , Charlotte, the US
Aging Management – 9 Key Attributes in REGDOG-2.6.3
9
Aging Management Plans (AMPs) and Life Cycle Management Plans (LCMPs) must comply with the requirements of CNSC REGDOC-2.6.3
must be implemented in accordance with the overall Integrated Aging Management Program framework, and
Must address the 9 attributes of an effective aging management program (same attributes as in IAEA NS-G-2.12 and International Generic Ageing Lessons Learned (IGALL)).
9 Attributes of an Effective Aging Management Program
(e.g., monitoring/detection/acceptance criteria, etc.)
Provide Sample Methodology* for Aging Evaluation in REGDOG-2.6.3
(Sample Methodology*: Adapted from the IAEA NS-G 2.12 on Ageing Management of Nuclear Power Plants)
E-Doc# 4532918 IAEA/EPRI International Meeting on Aging Management of Buried and underground Piping and Tanks for Nuclear Power Plant October13, 2014 , Charlotte, the US
CSA N285.4: Periodic Inspection of CANDU nuclear power plant components - Overview
10 E-Doc# 4532918 IAEA/EPRI International Meeting on Aging Management of Buried and underground Piping and Tanks for Nuclear Power Plant October13, 2014 , Charlotte, the US
CSA Standard N285.4 addresses periodic inspection requirements for pressure boundary systems
- “systems containing fluid that directly transports heat from nuclear fuel;
- systems essential for the safe shutdown of the reactor of the safe cooling of the fuel,
or both, in the event of a process system failure; and
- other systems or components whose failure could jeopardize the integrity of the
systems described in Item (a) or (b) or both.”
Clause 7.4.7 establishes requirements for the inspection of systems potentially susceptible to corrosion and erosion
- covers any buried piping
CSA N285.7: Periodic Inspection of CANDU nuclear power plant balance of plant pressure boundary systems and components - Overview
11 E-Doc# 4532918 IAEA/EPRI International Meeting on Aging Management of Buried and underground Piping and Tanks for Nuclear Power Plant October13, 2014 , Charlotte, the US
• Draft of CSA N285.7 currently issued for public review and comment
• CSA N285.7 will provide the minimum inspection requirements for periodic inspection program for balance of plant pressure boundary systems – Buried piping in the scope of this standard
• Selection of the systems and components in the scope of the program based upon Risk-Informed In-Service Inspection (RI-ISI) methodology
• Expect to incorporate standard into operating licences when it is published
CSA N285.7: Periodic Inspection of CANDU nuclear power plant balance of plant pressure boundary systems and components – RI-ISI
12 E-Doc# 4532918 IAEA/EPRI International Meeting on Aging Management of Buried and underground Piping and Tanks for Nuclear Power Plant October13, 2014 , Charlotte, the US
CSA N285.7: Periodic Inspection of CANDU nuclear power plant balance of plant pressure boundary systems and components – Risk Evaluation
13
NONE MEDIUM HIGH LOW
LOW
(Cat. 7)
LOW
(Cat. 7)
LOW
(Cat. 7)
HIGH
MEDIUM
LOW LOW
(Cat. 6)
LOW
(Cat. 7)
CONSEQUENCE CATEGORY
CCDP and CLERP Potential
DE
GR
AD
AT
ION
CA
TE
GO
RY
Pip
e R
up
ture
Po
ten
tial HIGH
(Cat. 3)
HIGH
(Cat. 1)
HIGH
(Cat. 2)
MEDIUM
(Cat. 5)
LOW
(Cat. 6)
MEDIUM
(Cat. 5)
MEDIUM
(Cat. 4)
Consequence Evaluation
Failure
Potential
Assessment
(Degradation
Mechanism)
E-Doc# 4532918 IAEA/EPRI International Meeting on Aging Management of Buried and underground Piping and Tanks for Nuclear Power Plant October13, 2014 , Charlotte, the US
14
Closing Remarks
• CNSC Requires that licensees have programs to ensure Fitness for Service of Structures, Systems and Components (SSCs) in accordance with Power Reactor Operating License (PROL)
• Aging Management Plan (AMP) must be implemented in accordance with the overall Integrated Aging Management Program framework addressed in CNSC regulatory document, REGDOC-2.6.3
• CSA N285.4 referenced in operating licences • CSA N285.7 is under development incorporating Risk Informed
In-Service Inspection (RI-ISI) concept
E-Doc# 4532918 IAEA/EPRI International Meeting on Aging Management of Buried and underground Piping and Tanks for Nuclear Power Plant October13, 2014 , Charlotte, the US
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E-Doc# 4532918 IAEA/EPRI International Meeting on Aging Management of Buried and underground Piping and Tanks for Nuclear Power Plant October13, 2014 , Charlotte, the US
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