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Key Elements in Seismic Qualification of Equipment Using the Experience-Based Method

Key Elements in Seismic Qualification of Equipment Using the Experience-Based Method. What is the Seismic Experience-Based Method?. Methods applied to verify that as-installed equipment in operating plants is seismically adequate

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Key Elements in Seismic Qualification of Equipment Using the Experience-Based Method

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  1. Key Elements inSeismic Qualification of EquipmentUsing the Experience-Based Method

  2. What is the Seismic Experience-Based Method? • Methods applied to verify that as-installed equipment in operating plants is seismically adequate • Approach has also been applied in new revisions national standards (IEEE 344-2004 and ASME QME) • Range of cost savings realized by SQUG member utilities is up to $500,000/year with significantly shorter procurement times

  3. What is SQUG? • Seismic Qualification Utility Group, formed to develop resolution of NRC Unresolved Safety Issue (USI) A-46 • Membership: • Originally there were 30 U.S. companies, but through consolidation there are now 15 U.S. companies • 12 International companies • Charter: EPRI Owner's Group • Leadership: • Utility Steering Group (6 members currently serving) • EPRI project management • Contractor support

  4. Members of SQUG – Past and Present * SQUG power plant(s) acquired by another SQUG member utility ** Former SQUG member company All but one U.S. utility directly affected by USI A-46became a member of SQUG in the 1980s

  5. What is the Seismic Experience-Based Method? Collect Field and Test Experience Data • Earthquake reconnaissance investigations • Past shake table tests Method Includes the Development of: • More than twenty classes of equipment • Generic seismic ruggedness levels • Restrictions, bounds, and conditions on its use • Data limits • Good practices • Lessons learned

  6. What is the Earthquake Experience Database? • Collection of data from large earthquakes since 1971 • Contains detailed records of equipment performance • Documents root causes of damaged equipment • Contains inventories of undamaged equipment • Continues to be updated as large, significant earthquakes occur Earthquake Experience Database include success and failure data

  7. Primary Earthquakes Contributing to the Experience Database Adak Quebec Boram Mt. Armenia Wales Livermore Ferndale & Humbolt Alum Rock Italy Painesville Loma Prieta Miyagh-Ken-Oki Gilroy Chalfant Valley Bishop & Mammoth Mt. Morgan Hill Gorman Turkey Coalinga Izu Peninsula Upland Santa Barbara Point Mugu Northern Taiwan Iran San Fernando Whittier Central Luzon, Philippines Palm Springs Superstition Hills Brawley & Imperial Valley Cerro Prieto Mexico San Salvador Managua Costa Rica & Panama Chile Australia New Zealand

  8. Facilities Housing Equipment in Database • Power generation facilities • Substations • Pumping stations • Industrial facilities • Commercial facilities • Refineries

  9. Classes of Equipment Covered by Experience Data 1. Motor control centers 2. Low voltage switchgear 3. Medium voltage switchgear 4. Transformers 5. Horizontal pumps 6. Vertical pumps 7. Fluid-operated valves 8A. Motor-operated valves 8B. Solenoid-operated valves 9. Fans 10. Air handlers 11. Chillers 12. Air compressors 13. Motor-generators 14. Distribution panels 15. Batteries on racks 16. Battery chargers and inverters 17. Engine-generators 18. Instruments on racks 19. Temperature sensors 20. Control and instrumentation panels and cabinets 21. Tanks and heat exchangers 22. Cable and conduit raceways 23. Overhead cranes 24. Piping systems 25. HVAC duct and damper systems

  10. Extent of Data – Vertical Pumps (Example) Vast majority of equipment was operable during/after the earthquake

  11. Bounds of Application Final SQUG Equipment Capacity Ground motion from some of the largest earthquakesformed the basis for equipment seismic capacity

  12. 10 Dry-Type Transformer 5% Damping Spectral Acceleration (g) 8 Failure Data 6 Success Data GERS 4 2 0 30 ZPA 20 10 5 1 Frequency (Hz) Development of Generic Equipment Ruggedness Spectra (GERS) Generic test data was used to establish higher equipment capacities

  13. SER 1. Overall Approach for Resolving USI A-46 Safe ShutdownEquipment List(SSEL) Equipment Evaluation Relay Review NRC Summary Report Outlier Resolution NRC Completion Letter

  14. 2. Equipment Evaluation SSEL 20 Classes of Equipment Tanks & Heat Exchangers Cable Trays & Conduit Raceways Summary Report

  15. 3. Equipment Class Screens Capacity > Demand? SSEL Caveats Met? Anchorage OK? Equipment Screens No Seismic Interaction Concerns? Outliers Justify or Upgrade Seismically Adequate Summary Report

  16. Summary Report 6. Relay Review Screens SSEL for Relay Review Equipment Selection Essential Relays Outliers SSEL Outlier Relays Seismic Review Not Needed Seismic Cap. vs. Demand System/Circuit Analysis Justify or Upgrade Seismically Adequate

  17. Generic Implementation Procedure (GIP) • GIP includes detailed, NRC-accepted procedures developed prior to execution of USI A-46 reviews by SQUG members • GIP defines minimum set of safe shutdown equipment • Includes screening guidelines and acceptance criteria • Includes plant walkdown procedures • Includes special evaluations for: • Tanks and heat exchangers • Cable trays and conduit raceways • Relays GIP provides comprehensive seismic evaluationguidelines and criteria for many classes of equipment

  18. Generic Implementation Procedure (GIP) • GIP facilitated NRC review and approval of the guidelines and criteria for resolution of USI A-46 • GIP walkdowns and evaluations require engineering judgment • NRC required experienced, trained engineers to use GIP • SQUG developed several utility training courses to implement the GIP: • Development of Safe ShutdownEquipment List (SSEL) • Relay Evaluation • Walkdown and Screening Evaluation • Workshops

  19. Key Elements of GIP Method • Covers conventional electrical equipment, mechanical equipment, tanks, heat exchangers, and cable/conduit raceways • Based on earthquake and test experience data • Requires plant walkdowns of the equipment • Requires use of engineering judgment • Requires use of experienced, trained Seismic Capability Engineers (SCEs) • Minimizes need for dynamic analysis and shake table testing

  20. New and Replacement Equipment (NARE) GIP method can also be used for seismic qualification of New and Replacement Equipment and Parts • For qualifying commercial-grade equipment and parts • Can be used for the remainder of the operating life of plant • Can be integrated with procurement process for parts • Seismic, procurement, and licensing engineers involved • SQUG developed training courses to apply NARE method: • Two-day NARE Training Course to enhance the capabilities of the SCEs • One-half day SQUG/NARE Awareness Training Course to help other plant personnel understand the key elements of NARE process

  21. NARE Evaluation Examples SQUG has compiled examples of NARE evaluations based on members’ use of the method • NARE evaluation examples include: • Pump • Damper • Pressure gauge • Panels • Transformer inside a battery charger • Ball valve • Pressure regulator • NARE evaluation examples serve to illustrate: • Key elements of NARE evaluation • Appropriate level of detail, effort, and engineering judgment • Approaches for documenting NARE evaluations NARE evaluation examples are posted on SQUG web site

  22. NARE Support Program SQUG has in place the “NARE Support Program” designed to assist SQUG members in performing plant-specific NARE evaluations • Steering Group provides oversight • Protocol Chairman guides process on behalf members • Members submit data needed for NARE evaluations • SQUG Contractors perform NARE evaluations • SQUG develops NARE examples from evaluations • This program allows SQUG members to perform NARE evaluations: • Without developing plant-specific NARE procedures • Without having trained personnel on staff to perform the NARE evaluations • At minimal or no cost to support the SQUG contractors who perform the NARE evaluations Details of NARE Support Program, including how tointerface with SQUG, are posted on SQUG web site

  23. SQUG Support for Members’ Questions • SQUG provides answers to members' questions on topics related to use of the SQUG methodology and seismic issues • Communication methods for supporting members: • SQUG Web Site (http://squgweb.mpr.com/) • SQUG List Server – Members can communicate by email directly with all the other SQUG member representatives • E-mail questions – SQUG contractors provide rapid response to issues and questions of concern to SQUG members • Telephone communication – SQUG contractors provide rapid response to issues and questions of concern to SQUG members

  24. Conclusion • SQUG mission is to maintain the validity of and support and broaden the use of experience data as a cost-effective method for seismic qualification of equipment • The goal of SQUG is to reduce the level of owner’s group effort necessary to maintain and use the GIP in the future • To accomplish this mission and goal, SQUG provides members with an assortment of tools to help them fully implement and use earthquake and testing experience data For additional information contact: Robert Kassawara EPRI (650) 855-2775 RKassawa@epri.com

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