ML19205A436
| ML19205A436 | |
| Person / Time | |
|---|---|
| Site: | Seabrook  |
| Issue date: | 07/24/2019 |
| From: | NRC/OGC |
| To: | Atomic Safety and Licensing Board Panel |
| SECY RAS | |
| References | |
| 50-443 LA-2, ASLBP 17-953-02-LA-BD01, RAS 55108 | |
| Download: ML19205A436 (11) | |
Text
UNITED STATES OF AMERICA NUCLEAR REGULATORY COMMISSION ATOMIC SAFETY AND LICENSING BOARD In the Matter of Docket No. 50-443-LA-2 NEXTERA ENERGY SEABROOK, LLC ASLBP No. 17-953-02-LA-BD01 (Seabrook Station, Unit 1)
Hearing Exhibit Exhibit Number: NRC064 Exhibit Title: Sherry Berhoft, EPRI Senior Program Manager, NRC Commissioner Briefing on the Status of Subsequent License Renewal Preparations, EPRI Long Term Operations: Research & Development for Aging Management (Apr. 26, 2017)
EPRI Long Term Operations Research & Development for Aging Management Sherry Bernhoft EPRI Senior Program Manager NRC Commissioner Briefing on SLR April 26, 2017
© 2017 Electric Power Research Institute, Inc. All rights reserved.
Technical Basis for Aging Management Inspection
- How to inspect Assessment
- What equipment and techniques are available
- What to inspect and when
- What are the associated
- Inspection options uncertainties
- How to dispose any observed
- What techniques need to be degradation improved Mitigation and Testing Technical Support
- Prevent or reduced degradation
- Review of inspection results
- Irradiated material testing
- Guidelines review and maintenance
- Non-irradiated material testing The technical basis for aging management is established, and incorporated in the aging management programs Over 125 EPRI technical reports are referenced in the SLR GALL 2
© 2017 Electric Power Research Institute, Inc. All rights reserved.
EPRIs Approach Living Research Programs Issue Management Programs Technical reports are updated based upon:
Decades of aging management research Research Prioritized research plans Collaboration with US DOE, NRC Operating Research and International partners Experience NEI Initiative 03-08 Inspection Results Lead plant support 3
© 2017 Electric Power Research Institute, Inc. All rights reserved.
Four Key Technical Areas Reactor pressure vessel neutron embrittlement at high fluence Irradiated-assisted stress corrosion cracking of reactor vessel internals Concrete degradation Electrical cable qualification and condition assessment 4
© 2017 Electric Power Research Institute, Inc. All rights reserved.
Reactor Pressure Vessels (RPVs)
Surveillance capsule are used to monitor fracture toughness of the RPV and nozzles due to irradiation and other potential degradation mechanism PWRs - Programs to collect surveillance capsule data at higher fluences
- Coordinated Surveillance Program
- Supplemental Surveillance Program BWRs - Integrated Surveillance Program
- Extend for 80 years of operations An established embrittlement trend correlations exist to predict RPV mechanical properties 5
© 2017 Electric Power Research Institute, Inc. All rights reserved.
Reactor Vessel Internals Core Barrel Former Irradiation assisted stress corrosion cracking Core Barrel to Former Bolt (IASCC) of internals materials due to Baffle increased neutron fluence and the operating environment Baffle Plate Edge Bolt EPRI BWR Vessel Internals Program and Baffle to Materials Reliability Program (PWRs) Former Bolt Corner Edge (Long & Short) Bracket Baffle to Former Bolt Extensive work has been completed on IASCC initiation and crack growth rate models Harvested materials provide confirmation 6
© 2017 Electric Power Research Institute, Inc. All rights reserved.
Concrete Degradation Impacts on the structural integrity of concrete due to:
- Alkali-Silica Reactions (ASR)
- Irradiation and gamma heating EPRI is publishing a series of technical reports on ASR aging management Leveraging the irradiated concrete work completed at ORNL, developed a PWR biological shield wall model and published results Modeling concrete structures exposed to high levels of radiation demonstrated safety margins exist Developing aging management and evaluation programs for reactive aggregates 7
© 2017 Electric Power Research Institute, Inc. All rights reserved.
Electrical Cable Qualification and Condition Assessment EPRI aging management - scoping methodology Cable insulation materials age due to radiation, temperature and submergence EPRI aging management guidelines for low voltage and medium voltage cables Research continues to support asset management
- Condition monitoring
- Determine remaining useful life (RUL) 8
© 2017 Electric Power Research Institute, Inc. All rights reserved.
Summary Technical basis is established and in use for aging management Continuous improvements for aging management are based on research, inspections and operating experience Research results and technical reports are shared with the NRC staff Technical support for the leads plants 9
© 2017 Electric Power Research Institute, Inc. All rights reserved.
TogetherShaping the Future of Electricity 10
© 2017 Electric Power Research Institute, Inc. All rights reserved.