1. SGFP 22 Coupling
On 5/26, identified excessive concentric offset for the 22 SGFP coupling (67 mils in horizontal direction)
FMEA was developed which identified 9 potential causes
Most likely cause determined to be turbine shifting on pedestal
Next most likely failure modes considered were:
Pump temperature causing thermal movement
Pump shifting on base pedestal
Pump case jacking bolts restricting pedestal movement

2. Picture Following Event on 5/21
Loose Turning Gear Bolts
LP bearing pedestal hold down bolt (found loose post event)
Deformed dowel pin found 5/27
Dowel pin on opposite side found sheared

3. Inspection Timeline & Results
5/26 – Difficulty in installing bolting through turbine coupling
5/26 – Alignment checks post coupling found horizontal readings at 67 mil (vertical and axial acceptable)
5/27 – Found deformed dowel pin on east side of LP turbine bearing pedestal and sheared pin on west side
5/27 – Walkdown & Inspection by EIS and site personnel:
Seal packing gap (0 mils on west side; 50 mils on east – should be centered)
LP bearing pedestal appears to have moved west
Other 5/27 walkdown results:
Foundation has small crack in previous repaired location (acceptable – could be a pre-existing crack)
Inspection beneath found no other issues (no loose parts, keys remain intact, etc)

4. Turbine & Pump Alignment
Looking down, bearing pedestal appears to have moved west from this ridge
Inspection results:
Bearing pedestal visually appears moved to west
Seal packing off-center to west
Dowling pin found sheared on west, deformed on east
Turbine coupling bolting difficulties
Alignment checks off 67 mils in horizontal direction
East
Slide 1 view
Turbine
Pump
West

5. Further Actions Additional actions taken:
Jacked turbine to align with dowel holes
Performing alignment check to determine if further adjustments are required