siemens - Public Service Commission

Alstom Proposal # SD22007, CR3 EPU Turbine Generator Retrofit MeetinP Notes, 05/15/07: Pg. 5 of 7
Engineering: Comments:
0 Provide estimated megawatt output vs. condenser pressure curve for the 57” LSB (16.8M2) LP turbine. Include on curve provided for the
47” LSB (12.9M2) LPturbine provided in proposal (pg. 209).
- Re: See pg. 2. Paul will email curve.
0 47” LSB LP turbine appears to choke at 2.2 In Hg. 47” LSB appears marginal for 1100 MWe output with 4 exhaust flows.
&Correct.
0 Has a 57”LSB LP turbine been retrofitted into a Westinghouse turbine frame? References are on pg. 43.
- Re: Diablo Canyon. Actual performance was much greater than predicted. Guaranteed 35 MW. Obtained 46 at unit 1 and 50 at unit 2.
0 Why was a full impulse HP turbine design selected? Is design constrained due to reuse of existing inlet nozzle box?
- Re: Standard design in Europe.
0 Should HP and LP turbine bearing be rebabbitted due to new rotor journals?
Re: Request to include in proposal.
0 Why is bearing 5 loaded greater than bearing 4 following retrofit (pg. 196)?
Re: Unknown at meeting.
0 Pg. 538 discusses bearing pedestal modification for reinforcing brackets. What is expected? Are modifications required?
Re: Bearing strongback to withstand L-0 blade failure by using stronger bolts and heavier strongback if needed.
Generator rotor rewind will reuse the existing rotor copper winding with new insulation. What is the rewound rotor current capacity rating?
- Re: 7,720 Amps @ 75 psi H2 gas pressure.
Generator mid-section replacement is rated at 1173 MVA. What is the rating limiting component? What is the excitation current required?
Re: Rotor is limiting above 1173 MVA. Excitation requirement is 6,770 amps @ max PF.
Generator stator rewind is rated at 1162.5 MVA. Excitation current required is 6,845A (pg. 120). What is the rating limiting component? Pg.
119 states field measurement confirmation is required. What is the risk? The capability curve is shown on pg. 121. Why isn’t the maximum
power output at unity power factor on the curve?
Re: Stator core is limiting for 1162.5 MVA stator rewind.
The generator stator rewind reuses the existing core iron as is. What engineering evaluations were performed to qualify reuse of the existing
core iron?
- Re: Engineering models were evaluated.
Is a generator startup ventilation test requires for either generator options?
Re: A ventilation test is not required based on experience.
What are the customer installation requirements for the stator cooling water skid and the static excitation system? Pg. 73 states the water
skid and water tank control system is not included? What does this mean?
Re: The proposal statement in not applicable.
0 What load rating will the lifting beam have?
- Re: Design rating should be for generator rotor 360,000 lbs. Lifting slings are included.
PEF-NCR-0 1347