lessons learned from angra 1 & angra 2 npp’s outages · lessons learned from angra 1 &...
TRANSCRIPT
Lessons learned from Angra 1
& Angra 2 NPP’s Outages
DO – Diretoria de Operação
SM.O – Superintendência de Manutenção
Preparado por: Luciano Junqueira Calixto
Email: [email protected]
Angra 1 & Angra 2 Data Angra 1:
• 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: 1981 - 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: 2000 - Commercial Operation since Jan/2001;
Basic Outage Planning Milestones
Basic Outage Planning Milestones
General Outage Coordination Structure
Plant Manager
Or Deputy
Maintenance Coordinator
Operation Coordinator
System Engineer
Coordinator
RadiologicalProtection
Coordinator
Design Engineering Coordinator
Outage Coordinator
Quality Assurance
Coordinator
Outage Control Center Main Tasks
• Follow-up of Outage Activities, specially the critical path;
• Evaluate deviations and look for each Area Coordinator to
expedite the solution, in order to return to the original
schedule;
• Deliberate about changes on the critical path;
• Evaluate Nuclear Safety;
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;
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;
Past Outages results
Angra 1:
Days
# T
asks
Past Outages results
Angra 2:
0
1000
2000
3000
4000
5000
6000
0
5
10
15
20
25
30
35
40
2P5 (2007) RCP 2P6 (2008) 2P7 (2009) 2P8 (2010) 2P9 (2012) 2P10 (2013) 2P11 (2014)
Days
# T
asks
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 Coordinators” for the critical path and
main inspection tasks;
• Preparation of a “Containment Arrangement” due to multiple /
concurrent task demanding polar crane inside containment;
Thank You !
DO – Diretoria de Operação
SM.O – Superintendência de Manutenção
Preparado por: Luciano Junqueira Calixto
Email: [email protected]