Circuit Breaker Users Group Open Session Breifing. Jim Sharkey Senior Project Manager Circuit Breaker Users Group Meeting June 6, 2012
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1 Circuit Breaker Users Group Open Session Breifing Jim Sharkey Senior Project Manager Circuit Breaker Users Group Meeting June 6, 2012
2 Presentation Overview Safety CBUG Mission CBUG Issues List History; Cornerstone documents Operating Experience Review and Analysis EPRI Circuit Breaker Initiatives Future Meetings 2
3 Be Safe!! Be aware of surroundings; Avoid suspicious characters Travel in groups; Do not walk alone at night Stick to well-lit, well-populated areas. Take a taxi rather than walking unfamiliar streets. Avoid driving / parking 3
4 Our Mission Provide information, guidance, and tools to help increase reliability, reduce costs, and improve safety. Resolve issues via working groups and guidance Develop/Maintain preventive maintenance basis Information repository (Website; Collaboration tools) Contact network Workshops and training opportunities Facilitate interaction with vendors and suppliers 4
5 Circuit Breaker Users Group Issues Brief EPRI (Available to anyone via Better define electrical bus inspection and testing, and monitoring Provide Guidance for Motor Control Center Maintenance Identify Lessons Learned from Circuit Breaker Replacements Provide Guidance for Training of Circuit Breaker Specialists and Program Owners Update EPRI guidance on circuit breakers and switchgear Review / develop PM Basis Templates 5
6 Historical Background; Circuit Breakers 1990 EPRI began developing circuit breaker guidance st Circuit Breaker Users Group meeting (Magne-Blast) EPRI added meetings for other breaker models 1997 NRC proposed potential generic letter 1998 NEI Task Force formed to respond to NRC 1998 INPO SOER issued 1999 IN issued NRC issues letter addendum to IN EPRI issues , Circuit Breaker Maintenance Programmatic Considerations 2009? Breakers topic in Regulatory Information Conference 6
7 Cornerstone Documents for Circuit Breakers INPO SOER and Training material suppliment Circuit Breaker Reliability NRC IN Insights from NRC Inspections of Low and Medium-Voltage Circuit Breaker Maintenance Programs NRC Open Letter to the Industry Subject: Insights from NRC Circuit Breaker Maintenance Program Inspections ; Letter is an addendum to IN 99-13; Letter received in1999, but not dated; Reprinted in EPRI EPRI Circuit Breaker Maintenance Programmatic Considerations 7
8 Common Cause Analysis Number of Events Cause Code Description 16 PM deficiency 14 Human Performance 10 Defective Part 12 Indeterminate 6 Design deficiency 3 Procedure deficiency 8
9 OE Review - PM Deficiencies Failed fuse on PT secondary; Reactor scram; Sequoyah Failed relay in control circuit; EDG output breaker; Limerick DS-416; Binding of trip shaft and trip latch; Hardened grease; South Texas Update on Farley bus failure; Farley; May 2011 Anderol grease hardening on HK; Comanche Peak Loose wiring at PT; Extended outage 4 days; River Bend Update on Magne-Blast arc chute failure at STP; Nov 2010 Anderol grease hardening on K-Line; Catawba (Gene Black to discuss) Breaker-Cubicle issues with AK-25s; Hatch; (Request Ashok Vora to discuss) 9
10 OE Review Procedure Deficiencies Inadequate cleaning of inertia latch and pivot pin on DB-50; Indian Point Asbestos found during overhaul of K-Line & Magne-Blast; Salem 10
11 OE Review Indeterminate Breaker fault; Unknown 480 V breaker; Seabrook Failure of two Eaton vacuum breakers after 6 year PM; Hatch; Request briefing Magne-Blast failure; Cause unclear; VC Summer HK; Vogtle; Relay or the breaker? DS-206 failed to fully open; Byron Finger clusters damaged and off bushing; Powell vacuum; Calvert Cliffs Intermittent trips; Ft. Calhoun. Update on DS-416 failure at Vogtle; Likely cause of breaker opening related to recently installed solid state protection system under-voltage driver circuit board. April
12 OE Review Human Performance Half scram due to radio transmitter in vicinity of susceptible equipment; Grand Gulf Reactor trip; Short circuit while performing maintenance; Palisades Safety: Twice found 4KV voltage on stabs; Robinson Safety: Improperly hung clearance tags; Robinson 50% Power reduction due to screwdriver shorting terminals; Palo Verde 12
13 OE Review - Defective Parts Reactor trip due to failed relay coil in RCP circuit; Robinson ABB Control device failure; Breaker type unknown; Comanche Peak; Request briefing from Al Garza 13
14 OE Review - Design Deficiency Update on Fort Calhoun fault/fire from breaker-to-cubicle design deficiency; June 2011 failure Replaced thermal-magnetic MCCB with solid state after considering temperature increases in a postulated event; Oconee (Request briefing from Duke) Insufficient margin on instantaneous MCCB setting for large cyclic load; Quad Cities Supply breaker tripping on instantaneous due to trip setting calculation; South Texas; Request briefing from Rodrigo 14
15 OE Analysis Two largest contributors to common cause: Human Performance and PM deficiency Two events with aging of Anderol grease 11 Human performance events including 1 plant trip and 2 power reductions PT fuse/fuse clips and wiring; 2 events; One reactor scram EDG output breaker control relay failure (FMOP engine) Key OE updates on previous failures: STP Magne-Blast arc chute failure; Ft Calhoun breaker-cubicle fault; Farley bus failure 15
16 OE Analysis Power Reductions PTs Scram due to failed fuse on PT (Sequoyah) Outage ext: Loose wiring; PT fuse holders; Outage extension only (River Bend) 16
17 OE Analysis Power Reductions Human Performance Scram due to worker practices; Palisades Half scram; Use of Radio transmitter; Grand Gulf 50% power reduction due to worker practices; Palo Verde 2% power reduction; Human performance; Catawba Scram due to relay in RCP control circuit; Robinson Potential cable failure?? May 24 th ; River Bend 17
18 EPRI Circuit Breaker Initiatives Guidance for Development of Circuit Breaker Specialists Mike Tulay will discuss this morning Review and comments requested by June 15 th (1 week) Revision of K-Line PM and Overhaul guidance PM in progress; Review and comments requested Overhaul; Sept 12-13; EPRI offices in Charlotte, NC Motor control center (MCC) maintenance Planned future project 18
19 EPRI Circuit Breaker Initiatives Lessons learned from Exelon bus inspections Exelon s extensive inspection and testing program represents a unique and significant opportunity for EPRI and the industry to capture data, photographs, and lessons learned. EPRI working with Exelon to publish this information Tom Figiel (Exelon) and Jim Bothwell (Consultant) 19
20 Future Meeting Locations and Dates Dates - Target dates: First two weeks in June Week of June 3 rd or June 10 th (No Fathers Day Conflict) Location - Primary considerations for meeting location Cost Adjacent to switchgear/breaker facility (potential tours) Centralized location (US and center-city) Identified one year in advance 20
21 Questions? 21
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