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

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Presentation on theme: "1 Key Elements in Seismic Qualification of Equipment Using the Experience-Based Method."— Presentation transcript:

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

2 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 and ASME QME) Range of cost savings realized by SQUG member utilities is up to $500,000/year with significantly shorter procurement times

3 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 4 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 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 *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-46 became a member of SQUG in the 1980s

5 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 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 7 Primary Earthquakes Contributing to the Experience Database Costa Rica & Panama San Fernando Whittier Palm Springs Chile Superstition Hills Brawley & Imperial Valley Cerro Prieto Mexico San Salvador Managua Adak Ferndale & Humbolt Loma Prieta Chalfant Valley Morgan Hill Coalinga Santa Barbara Point Mugu Boram Mt. Quebec Painesville Bishop & Mammoth Mt. Gorman Upland Alum Rock Gilroy Livermore Wales Italy Turkey Iran Armenia New Zealand Australia Northern Taiwan Izu Peninsula Miyagh-Ken-Oki Central Luzon, Philippines

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

9 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 10 Extent of Data – Vertical Pumps (Example) Vast majority of equipment was operable during/after the earthquake

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

12 12 Development of Generic Equipment Ruggedness Spectra (GERS) Spectral Acceleration (g) Frequency (Hz) ZPA Dry-Type Transformer 5% Damping Failure Data Success Data GERS Generic test data was used to establish higher equipment capacities

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

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

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

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

17 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 evaluation guidelines and criteria for many classes of equipment

18 18 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 Generic Implementation Procedure (GIP)

19 19 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

20 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 21 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 NARE evaluation examples are posted on SQUG web site

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

23 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 ( ) - SQUG List Server – Members can communicate by directly with all the other SQUG member representatives - 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 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) For additional information contact: Robert Kassawara EPRI (650)


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