1. Energy Intensive User Group Generation Maintenance Update
L. Reddy
Date: 8th May 2012
2018/12/09

2. Generation Maintenance Index
Work execution is tracking planned work closely – ensuring as much that can be done is done
Shutdown maintenance parameters remain below par performance and remains an area of concern
Lag in planned maintenance reflects lower risk-deferred maintenance
Reliability Basis Updates
Schedule Compliance
Planned Maintenance Compliance
2018/12/09

3. Shutdown Maintenance: Plan vs Actual (6 month historic view)
More than 8000MW on maintenance over Dec-Jan festive period
Average capacity on maintenance exceeded 5000 MW for period
Actual maintenance approximated 90% of the planned outage requirement
Outages scheduled on priority to minimise safety, legal and environmental compliance, to minimise plant damage and then to manage plant reliability – outage scope maximised within available shutdown time;
Deferred outages tracked and monitored for continuing risk – prioritisation elevated if risk increases or if capacity allows
2018/12/09

4. c2012-13 Maintenance Challenge
Unoptimised planned maintenance requirement
The goal is a maintenance ratio of 10% of capacity, including 3% to address the backlog: Actual achieved at the end of December 2011 is 15.62% and 8.14% for the financial YTD at 16/01/12.
The planned outage requirements exceed the capacity available for maintenance and so liquid-fuel open cycle gas turbine usage and demand-side management become critical.
Planned outages are ranked on scope and risk, to enable prioritisation of outages within the available capacity. Lower risk outages (inspections and interim repairs) have had to make way for high-risk, high-pressure pipe-work replacements, low-pressure turbine blade inspections and major refurbishment outages. All “deferred” outages are monitored for risk until they can be accommodated.

5. Shutdown Maintenance Summary
Capacity continues to be constrained necessitating optimised scheduling of outages within available capacity allowance
Risk-based ranking continues as basis to prioritise outage schedule. Resource constraints becoming an important consideration
Increased focus on operational risk reduction – spares availability and turnaround, coal quality outside of contract specification, quality of workmanship during shutdown maintenance
Focus on quality of outage planning and execution (“Pit-stop” vision – quality, effective and efficient)
Today 8% of generating capacity on shutdown maintenance (incl. Koeberg)
For the first time up to two (2) large capacity unit outages will be run through this winter.
2018/12/09