Key Elements in Seismic Qualification of Equipment Using

Key Elements in Seismic Qualification of Equipment Using the Experience-Based Method 1

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 2

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 3

Members of SQUG – Past and Present American Electric Power Co. AWE (United Kingdom) Baltimore Gas & Electric Co. * Boston Edison Co. * British Energy (United Kingdom) Bruce Power (Canada) Carolina Power & Light Co. * Central Nuclear De Almaraz (Spain) ** Commissariat à l'Énergie Atomique (CEA) (France) Commonwealth Edison Co. * Consolidated Edison Co. of New York, Inc. * Constellation Energy Consumers Power Co. * Detroit Edison ** Dominion Duke Energy (formerly Duke Power Co. ) Duquesne Light Co. * Electricité de France (France) ENEL ctn (NIRA) (Italy) ** Entergy Exelon First Energy * SQUG power plant(s) acquired by another SQUG member utility ** Former SQUG member company Florida Power Corp. * Forsmarks Kraftgrupp AB (Sweden) ** GPU Nuclear Corp. * Iowa Electric Light & Power Co. ** Korea Hydro & Nuclear Power (Korea) ** Magnox North (United Kingdom) Nebraska Public Power District New York Power Authority * Niagara Mohawk Power Corp. * Northeast Utilities Services Co. * Northern States Power Co. * Nuclear Electric * Nuclear Management Company * OKG AB (Sweden) Omaha Public Power District Ontario Power Generation (Canada) Pennsylvania Power & Light Co. * Philadelphia Electric Co. * Portland General Electric Co. ** Progress Energy Public Service Company of Colorado ** Public Service Electric & Gas Co. * PSEG Nuclear Rochester Gas & Electric Corp. * Rolls-Royce Power Engineering (United Kingdom) Sacramento Municipal Utility District ** Scottish Nuclear (Scotland) * Siemens/KWU (Germany) ** Southern California Edison Co. ** Southern Nuclear Corp. - Alabama Power Co. - Georgia Power Co. Tennessee Valley Authority Tokyo Electric Power Company (Japan) Toledo Edison Co. * Tractebel-Suez (Belgium) Vattenfall AB, Ringhals (Sweden) Virginia Power Co. * Westinghouse Savanna River Co. ** Wisconsin Electric Power Co. ** Wisconsin Public Service Corp. * Yankee Utilities * - Maine Yankee Atomic Power Co. - Vermont Yankee Nuclear Power Corp. - Yankee Atomic Electric Co. Xcel Nuclear All but one U. S. utility directly affected by USI A-46 became a member of SQUG in the 1980 s 4

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 5

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 6

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

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

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

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

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

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

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

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

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

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

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 evaluation guidelines and criteria for many classes of equipment 17

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 Shutdown Equipment List (SSEL) Relay Evaluation Walkdown and Screening Evaluation Workshops 18

Key Elements of GIP Method 1. Covers conventional electrical equipment, mechanical equipment, tanks, heat exchangers, and cable/conduit raceways 2. Based on earthquake and test experience data 3. Requires plant walkdowns of the equipment 4. Requires use of engineering judgment 5. Requires use of experienced, trained Seismic Capability Engineers (SCEs) 6. Minimizes need for dynamic analysis and shake table testing 19

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 20

NARE Evaluation Examples SQUG has compiled examples of NARE evaluations based on members’ use of the method • NARE evaluation examples include: • NARE evaluation examples serve to illustrate: - Pump Damper Pressure gauge Panels Transformer inside a battery charger Ball valve Pressure regulator 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 21

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 to interface with SQUG, are posted on SQUG web site 22

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 23

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