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

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

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)

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

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