Implementation of SQUG Experience-Based Methods for Seismic Qualification of Equipment

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Earl Barker
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1 Implementation of SQUG Experience-Based Methods for Seismic Qualification of Equipment Presentation for: 2006 MCEER Annual Meeting June 29 ~ 30, 2006 Prepared by: Steve Eder & John Dizon Facility Risk Consultants, Inc.

address concerns with seismic equipment qualification in older plants Utilities banded and

2 What is SQUG? In 1980, the Nuclear Regulatory Commission (NRC) issued Unresolved Safety Issue (USI) A-46 to address concerns with seismic equipment qualification in older plants Utilities banded and formed the Seismic Qualification Utility Group to address USI A-46 The use of earthquake experience data was born Rules are described in the Generic Implementation Procedure (GIP)

3 SQUG Accomplishments The USI A-46 program was implemented and resolved by most nuclear utilities from 1993 to The GIP methods remained proprietary to SQUG. Experience data is currently used on a regular basis for seismic qualification of new and replacement equipment in nuclear power plants. Collaboration with MCEER is now underway. Electric Power Research Institute (EPRI) maintains the electronic earthquake experience data base (esqug).

Earthquake Experience Data Base Industrial facilities and power plants subjected to strong motion earthquakes were reviewed to determine performance of equipment during and after earthquakes Detailed

4 Earthquake Experience Data Base Industrial facilities and power plants subjected to strong motion earthquakes were reviewed to determine performance of equipment during and after earthquakes Detailed documentation was collected and studied for 20 classes of equipment plus other features. In general, lessons learned follow a clear trend: Well anchored equipment, free of certain caveats and seismic interaction concerns, performs well in major earthquakes.

Using Earthquake Experience Data Inclusion rules are used to define the bounds of each equipment class whose seismic adequacy is verified by the earthquake experience success data.

5 Using Earthquake Experience Data Inclusion rules are used to define the bounds of each equipment class whose seismic adequacy is verified by the earthquake experience success data. These address: Configuration, size limitations, weight limitations, operating capacity limits, etc. Materials, subcomponents, manufacturer classifications, design & construction standards, etc. Other issues derived from investigation of shake table fragility tests, analyses, expert panels, etc.

6 Using Earthquake Experience Data Bounding Spectra are used to define the seismic capacity, based on the experienced level of ground shaking, for each equipment class whose seismic adequacy is verified by the earthquake experience success data.

7 esqug Provides Archive of Raw Data

9 Generic Implementation Procedure Four criteria are used to verify seismic capacity: Seismic Capacity vs. Demand (Comparison with SQUG Bounding Spectrum) Earthquake Experience Database Caveats and Inclusion Rules Anchorage Evaluation Seismic Interaction Evaluation Checklists are used for documentation

10 The 20 Classes of Equipment SQUG Equipment Classes (functionality) Include: Motor control centers Low voltage switchgear Medium voltage switchgear Transformers Horizontal pumps Vertical pumps Fluid-operated valves Motor-operated valves Solenoidoperated valves Fans Chillers Air Handlers Air compressors Distribution panels Batteries on Racks Battery chargers & inverters Engine generators Instruments on racks Temperature sensors I&C Panels and Cabinets

11 Other Features Also Covered by SQUG Tanks Heat Exchangers Conduit and supports Cable trays and supports Piping and pipe supports HVAC ducting and supports Dampers Cranes

12 SQUG & MCEER Collaboration for access to data and reports Placeholder criteria and procedures for seismic qualification of equipment Assignment of long term roles and responsibilities such as: Earthquake investigations Equipment damage assessments Derivation of site ground motion Data archive

20 Sa (g) (5% damping) 1.00 0.80 0.60 0.

13 General Approach will Follow the SQUG GIP Capacity versus Demand Seismic Capacity vs Demand Sa (g) (5% damping) Reference Spectrum Project Site Frequency (Hz)

14 Caveats and Inclusion Rules

15 Implementation of SQUG Experience-Based Methods for Seismic Qualification of Equipment Questions? Steve Eder (256) John Dizon (510)

Overview of SQUG generic implementation procedure (GIP)

Nuclear Engineering and Design 123 (1990) 225-231 North-Holland 225 Overview of SQUG generic implementation procedure (GIP) Richard G. Starck II MPR Associates, Inc., 1050 Connecticut Avenue, N. w.. Washington,