Beneficial Practices
Institute of Nuclear Power Operations
2015 International Materials Benchmarking Visits Joe Sears, INPO Maribel Valdez, NextEra Mike Hoehn, Ameren © Copyright 2016 Institute of Nuclear Power Operations
Outline • Scope and objectives • Logistics
• Specific beneficial practices • General observations
© Copyright 2016 Institute of Nuclear Power Operations
Scope • Programs to protect and preserve passive reactor pressure boundary components – Steam generator management – Boric acid corrosion control – PWSCC mitigation – NDE implementation – Materials fatigue management © Copyright 2016 Institute of Nuclear Power Operations
Scope, continued • Programs to protect and preserve passive reactor pressure boundary components – Chemistry to minimize corrosion – Reactor vessel and internal inspection and management – Flow-accelerated corrosion and erosion – Buried piping aging management © Copyright 2016 Institute of Nuclear Power Operations
Basic Objectives • Visit several continents • Use teams composed of engineering
programs and chemistry subject matter experts • Identify best practices within scope areas for benchmarking purposes
© Copyright 2016 Institute of Nuclear Power Operations
Logistics • June 8-19, 2015 – Three stations in Eastern Europe – Kalinin NPP, Russia – 4 unit VVER – NPP Paks, Hungary – 4 unit VVER – Temelin NPP, Czech Republic – 2 unit VVER
• Team – – – – –
Randy Crane (INPO Lead) Bill Burke (INPO chemistry) Keith Dietrich (Watts Bar Engineering Programs Manager) Mike Sears (INPO loanee, Engineering Programs) Maribel Valdez (Braidwood Engineering Programs)
© Copyright 2016 Institute of Nuclear Power Operations
Eastern Europe Team
© Copyright 2016 Institute of Nuclear Power Operations
Logistics, continued • September 9-23, 2015 – Three stations in Asia – Mihama Power Station, Japan – 3 unit PWR – Kashiwazaki-Kariwa, Japan – 7 unit BWR – Kuosheng NPP, Republic of China (Taiwan) – 2 unit BWR
• Team – – – – –
Carl Larsen (INPO Lead) Mike Hoehn (Ameren Engineering Programs Supervisor) Steve Richter (Columbia Engineering Programs) Luis Terrazas (Entergy Design, Engineering Programs CFAM) John Underwood (TVA Chemistry CFAM)
© Copyright 2016 Institute of Nuclear Power Operations
Asia Team
© Copyright 2016 Institute of Nuclear Power Operations
Logistics, continued • 2015 – Selected INPO Review Visits in North America – Laguna Verde, Mexico – 2 unit BWR – Palo Verde NGS, U.S. – 3 unit PWR – Prairie Island NGP, U.S. - 2 unit PWR
• Various teams
© Copyright 2016 Institute of Nuclear Power Operations
Beneficial Practices – Steam Generator Management • Mitigation Practices: – SG blowdown mod and improved impurity flushing (Temelin) – Minimized corrosion product transport (Paks) • Electromagnetic filters in feedwater system • Octadecylamine (ODA) inhibits moisture build-up during shutdown and layup
• Inspection Techniques: – Air-assisted ECT probe insertion system reduces probe usage; increases speed (Palo Verde) – Array coil probes for 100% SG ECT scope eliminates special interest testing (Takahama, Prairie Island) © Copyright 2016 Institute of Nuclear Power Operations
Beneficial Practices – Steam Generator Management • Conservative pri/sec action limits (Paks) – First alert at 1 liter per hour (6 gpd) – Second alert at 2 liters per hour (13 gpd) – Shutdown at 5 liters per hour (32 gpd)
• Steam generator mock-ups (Paks, Palo Verde) – For training, practicing, ALARA, and qualifying inspection techniques
© Copyright 2016 Institute of Nuclear Power Operations
Steam Generator Tube Mockup
© Copyright 2016 Institute of Nuclear Power Operations
Beneficial Practices – RCS Pressure Boundary Integrity
• Stress corrosion cracking mitigation strategies – Replacement / innovative mitigation approaches
• Thermal fatigue management – Mitigation / replacement – Fatigue monitoring instrumentation
• Fatigue design basis updates – Updates with new seismic inputs
• Boric acid leakage – Leak tight integrity © Copyright 2016 Institute of Nuclear Power Operations
Fatigue Monitoring Instrumentation
© Copyright 2016 Institute of Nuclear Power Operations
Beneficial Practices – Reactor Vessel and Internals Management • Reactor vessel monitoring – Surveillance specimen
• Reactor vessel internals – Proactive baffle bolt replacement
• Stress corrosion cracking mitigation and inspection
– Bottom-mounted nozzle NDE (ECT) © Copyright 2016 Institute of Nuclear Power Operations
360° Platform on Rails
© Copyright 2016 Institute of Nuclear Power Operations
Beneficial Practices – FAC, Buried Piping, Condenser Integrity • Piping accessibility – Above ground / in-vault piping
• Liquid drop impingement – Screening / inspection program
• Risk-significant inspection scope – 100 % ECT of CCW heat exchangers
• 100% ECT of condenser tubes © Copyright 2016 Institute of Nuclear Power Operations
Above-ground or In-vault Piping
© Copyright 2016 Institute of Nuclear Power Operations
Beneficial Practices – Chemistry • Online monitoring equipment – Mihama • Fleet standardization – Kalinin • Resin test flow-loop – Kashiwazaki-Kariwa • Public engagement – chemistry pamphlet – TEPCO • Station engagement for asset preservation – Paks, Temelin, Kuosheng, KashiwazakiKariwa, Kalinin © Copyright 2016 Institute of Nuclear Power Operations
General Observations
• In contrast with U.S. plants, which often
rely on engineering evaluations, non-U.S. stations have a bias to: – Prevent and correct undesirable conditions • For example, boric acid leaks • For example, steam generator loose parts
– Replace components using improved designs • For example, thermal fatigue © Copyright 2016 Institute of Nuclear Power Operations
© Copyright 2016 Institute of Nuclear Power Operations
22
2015 International Materials Benchmarking Visits Joe Sears, INPO Maribel Valdez, NextEra Mike Hoehn, Ameren © Copyright 2016 Institute of Nuclear Power Operations
Outline • Scope and objectives • Logistics
• Specific beneficial practices • General observations
© Copyright 2016 Institute of Nuclear Power Operations
Scope • Programs to protect and preserve passive reactor pressure boundary components – Steam generator management – Boric acid corrosion control – PWSCC mitigation – NDE implementation – Materials fatigue management © Copyright 2016 Institute of Nuclear Power Operations
Scope, continued • Programs to protect and preserve passive reactor pressure boundary components – Chemistry to minimize corrosion – Reactor vessel and internal inspection and management – Flow-accelerated corrosion and erosion – Buried piping aging management © Copyright 2016 Institute of Nuclear Power Operations
Basic Objectives • Visit several continents • Use teams composed of engineering
programs and chemistry subject matter experts • Identify best practices within scope areas for benchmarking purposes
© Copyright 2016 Institute of Nuclear Power Operations
Logistics • June 8-19, 2015 – Three stations in Eastern Europe – Kalinin NPP, Russia – 4 unit VVER – NPP Paks, Hungary – 4 unit VVER – Temelin NPP, Czech Republic – 2 unit VVER
• Team – – – – –
Randy Crane (INPO Lead) Bill Burke (INPO chemistry) Keith Dietrich (Watts Bar Engineering Programs Manager) Mike Sears (INPO loanee, Engineering Programs) Maribel Valdez (Braidwood Engineering Programs)
© Copyright 2016 Institute of Nuclear Power Operations
Eastern Europe Team
© Copyright 2016 Institute of Nuclear Power Operations
Logistics, continued • September 9-23, 2015 – Three stations in Asia – Mihama Power Station, Japan – 3 unit PWR – Kashiwazaki-Kariwa, Japan – 7 unit BWR – Kuosheng NPP, Republic of China (Taiwan) – 2 unit BWR
• Team – – – – –
Carl Larsen (INPO Lead) Mike Hoehn (Ameren Engineering Programs Supervisor) Steve Richter (Columbia Engineering Programs) Luis Terrazas (Entergy Design, Engineering Programs CFAM) John Underwood (TVA Chemistry CFAM)
© Copyright 2016 Institute of Nuclear Power Operations
Asia Team
© Copyright 2016 Institute of Nuclear Power Operations
Logistics, continued • 2015 – Selected INPO Review Visits in North America – Laguna Verde, Mexico – 2 unit BWR – Palo Verde NGS, U.S. – 3 unit PWR – Prairie Island NGP, U.S. - 2 unit PWR
• Various teams
© Copyright 2016 Institute of Nuclear Power Operations
Beneficial Practices – Steam Generator Management • Mitigation Practices: – SG blowdown mod and improved impurity flushing (Temelin) – Minimized corrosion product transport (Paks) • Electromagnetic filters in feedwater system • Octadecylamine (ODA) inhibits moisture build-up during shutdown and layup
• Inspection Techniques: – Air-assisted ECT probe insertion system reduces probe usage; increases speed (Palo Verde) – Array coil probes for 100% SG ECT scope eliminates special interest testing (Takahama, Prairie Island) © Copyright 2016 Institute of Nuclear Power Operations
Beneficial Practices – Steam Generator Management • Conservative pri/sec action limits (Paks) – First alert at 1 liter per hour (6 gpd) – Second alert at 2 liters per hour (13 gpd) – Shutdown at 5 liters per hour (32 gpd)
• Steam generator mock-ups (Paks, Palo Verde) – For training, practicing, ALARA, and qualifying inspection techniques
© Copyright 2016 Institute of Nuclear Power Operations
Steam Generator Tube Mockup
© Copyright 2016 Institute of Nuclear Power Operations
Beneficial Practices – RCS Pressure Boundary Integrity
• Stress corrosion cracking mitigation strategies – Replacement / innovative mitigation approaches
• Thermal fatigue management – Mitigation / replacement – Fatigue monitoring instrumentation
• Fatigue design basis updates – Updates with new seismic inputs
• Boric acid leakage – Leak tight integrity © Copyright 2016 Institute of Nuclear Power Operations
Fatigue Monitoring Instrumentation
© Copyright 2016 Institute of Nuclear Power Operations
Beneficial Practices – Reactor Vessel and Internals Management • Reactor vessel monitoring – Surveillance specimen
• Reactor vessel internals – Proactive baffle bolt replacement
• Stress corrosion cracking mitigation and inspection
– Bottom-mounted nozzle NDE (ECT) © Copyright 2016 Institute of Nuclear Power Operations
360° Platform on Rails
© Copyright 2016 Institute of Nuclear Power Operations
Beneficial Practices – FAC, Buried Piping, Condenser Integrity • Piping accessibility – Above ground / in-vault piping
• Liquid drop impingement – Screening / inspection program
• Risk-significant inspection scope – 100 % ECT of CCW heat exchangers
• 100% ECT of condenser tubes © Copyright 2016 Institute of Nuclear Power Operations
Above-ground or In-vault Piping
© Copyright 2016 Institute of Nuclear Power Operations
Beneficial Practices – Chemistry • Online monitoring equipment – Mihama • Fleet standardization – Kalinin • Resin test flow-loop – Kashiwazaki-Kariwa • Public engagement – chemistry pamphlet – TEPCO • Station engagement for asset preservation – Paks, Temelin, Kuosheng, KashiwazakiKariwa, Kalinin © Copyright 2016 Institute of Nuclear Power Operations
General Observations
• In contrast with U.S. plants, which often
rely on engineering evaluations, non-U.S. stations have a bias to: – Prevent and correct undesirable conditions • For example, boric acid leaks • For example, steam generator loose parts
– Replace components using improved designs • For example, thermal fatigue © Copyright 2016 Institute of Nuclear Power Operations
© Copyright 2016 Institute of Nuclear Power Operations
22
