Lessons learned from Angra 1 & Angra 2 NPP s Outages

Transcription

1 Lessons learned from Angra 1 & Angra 2 NPP s Outages DO Diretoria de Operação SM.O Superintendência de Manutenção Preparado por: Luciano Junqueira Calixto lucical@eletronuclear.gov.br

2 Angra 1: Angra 1 & Angra 2 Data PWR Westinghouse Design; 121 Fuel Elements (33 control rods) 12 months cycle; 2 loops (2 Steam Generators 2 RCP s); 1 HP and 2 LP turbines; Installed capacity: 640 MWe (1809 MWth); First criticality: Commercial Operation since 1983; Angra 2: PWR Siemens / KWU design; 193 Fuel Elements (61 control rods) 12 months cycle; 4 loops (4 Steam Generators 4 RCP s); 1 HP and 3 LP turbines; Installed capacity: 1350 MWe (3765 MWth); First Criticality: Commercial Operation since Jan/2001;

3 Basic Outage Planning Milestones

4 Basic Outage Planning Milestones

5 General Outage Coordination Structure Plant Manager Or Deputy Quality Assurance Maintenance Operation System Engineer Outage Radiological Protection Design Engineering

6 Outage Control Center Main Tasks Follow-up of Outage Activities, specially the critical path; Evaluate deviations and look for each Area to expedite the solution, in order to return to the original schedule; Deliberate about changes on the critical path; Evaluate Nuclear Safety;

7 Angra 1 & Angra 2 basic Outage plan Angra 2 Pre outage (10-12 days prior to outage): Inspection of safety components of Outage main redundancy, such as 1 Safety Injection, 1 Component Cooling and 1 RHR pumps, according to Preventive Maintenance plan or due to Condition Based Monitoring; Angra 1 & Angra 2 Major Maintenance Plan (30 day outage): Reactor unload and refueling (Exchange 1/3 of Fuel Elements); Review of 1 turbine item (HP, LP or Electric Generator); RCP seal inspection and Exchange of 1 motor; Inspection of 1 redundancy of Main Steam valves; SG inspection (Sludge Lancing and/or ECT); Major Design Modifications implementation; Inservice Inspections and safety MOV actuators revision; Electrical and I&C Tests / Inspections (such as Reactor Protection); Circulating Water Motor inspection / exchange; Corrective and Elective Maintenance;

8 Maintenance during operating cycle Diesel Engine maintenance and associated Electric Generator inspection; Limitation system - I&C tests (Angra 2); Predictive maintenance (vibration, oil analysis and termography) of main componentes and electric panels; Minor Design Modifications; Water intake structure cleaning and material condition maintenance; MOV current measurement and profile analysis / trend; Radiation detector tests (electronic and with rad. source); Corrective, Elective and minor Maintenance; Chill water turbocharger revision; Air compressor revision; Important to safety redundant instrumentation loop tests; Fan belt tension evaluation / adjustment; Lubricating;

9 Days # Tasks Past Outages results Angra 1:

10 Days # Tasks Past Outages results Angra 2: P5 (2007) RCP 2P6 (2008) 2P7 (2009) 2P8 (2010) 2P9 (2012) 2P10 (2013) 2P11 (2014) 0

11 Recent Challenges and Lessons Learned Angra 1 1P21 (2015) outage delayed 23 days due to an employee Union s strike; Spare parts and consumables import and Customs clearance times; Temporary tools import and export time; Angra 2 2P11 (2014) delayed mainly due to Electric Generator test equipment 6 days shipment delay; Manpower qualification during outages. Around 1000 temporary contractors during outage (per plant); Stablishment of a long term (3-5 year) TG-set manufacturer contract; Inservice inspection control prior and during outage, specially of tests required for changing of operation modes ; Stablishment of Service s for the critical path and main inspection tasks; Preparation of a Containment Arrangement due to multiple / concurrent task demanding polar crane inside containment;

12 Thank You! DO Diretoria de Operação SM.O Superintendência de Manutenção Preparado por: Luciano Junqueira Calixto