Cabras 3 Recovery

Project Update

March 20, 2013

Cabras 3

• Cabras 3

Generator

produces 39

Megawatts of

power

Cabras 3 Engine

Cabras 3 Generator

• Cabras 3 is

one of

GPA’s most

modern

and

efficient

generators.

Issue Assessment Cabras 3

Recovery Plan

• In late 2012

a problem

was

discovered

with the

shaft of the

generator

Issue Assessment Cabras 3

Recovery Plan

• The extent and the consequences of

the problem were not apparent.

– The appropriate response was to:

• Shut down Cabras 3 to avoid further damage

• Establish a recovery plan

• Determine the cause

• Make sure that Cabras 4 is not affected

• Take immediate steps to bring Cabras 3 back

online as soon as possible

The Action Plan Is Underway

• The necessary dismantling of Cabras

3 has been completed

• Replacement of the cracked shaft is

underway

• An overhaul of the engine has

begun

• Completion of project is scheduled

for September 16th.

– On Budget

– Within Scope

– On time

C3R Schedule

Milestone Start Date Finish Date

Notice to Proceed (NTP) issued 1/30/2013 1/30/2013

Disassembly 2/20/2013 3/14/2013

Begin Lloyd’s third-party inspection 3/5/2013 3/14/2013

Prepare & submit manufacturer’s report 3/13/2013 4/15/2013

Material testing & preparation of report by Lloyd’s 3/15/2013 4/30/2013

Overhaul of engine 12/27/2012 6/7/2013

Installation, assembly, and balancing 7/22/2013 9/16/2013

Completion 9/16/2013 9/16/2013

Cabras 3 Recovery Team

Step 1 Disassembly: Remove the

Stator Housing

• Remove the Poles

• Stator Winding cut and

removed Feb. 22 - 26

• Each Stator Winding

Consists of three sets of

copper bars wound

around the housing

• Remove the Housing

Upper Stator Major Lift #1

February 27

Upper Stator Major Lift #1

Completed February 27th

• The upper stator assembly weight = 59 tons.

Remove the Upper Rotor Disk

• Twenty-four (24) bolts connected the two rotor

disc halves.

• The rotor disc is attached to

the shaft connecting flange,

with another twenty-four (24)

bolts.

Upper Rotor Disc Removal

Major Lift #2 March 9

Upper Rotor Disc Removal

Major Lift #2 Mar. 9 On Schedule

Upper Rotor Disc Removal

Weight 102 Tons

Shaft & Lower Disc Exposed

• Generator shaft and

lower rotor disc are

chained together for the

final lift.

• The shaft and lower rotor

disc weigh 155 tons

– 102 tons for lower disc half

– 53 tons for shaft

Step 3: Lower Rotor Disc and

Generator Shaft Removal March 13

Lower Rotor Disc and Generator Shaft

Removal Lift #3 March 13 On

Schedule

Next Steps

• Now that the generator is disassembled, the

connecting area of the two rotor disc

halves will be inspected for cracks and any

damage.

• After inspection and analysis, a

determination will be made whether a new

rotor disc will be needed.

• A full report of the findings will be made to

the PUC in late April

Thank You

Questions

Questions