siemens - Public Service Commission

Progress Energy Crystal River Unit 3
Request for Proposal for Engineering Services to Upgrade Secondary System
6/25/2007
1.9.1 1 Feedwater Control Valves and Feedwater Control System Stability
Feedwater flow is regulated by feedwater pump speed and the Startup FW control
valves, FWV.39 8 FWV-40, from 0 to 15% flow, by feedwater pump speed and the
Low-Load Flow Control Valves, FWV-37 8 FW-38, from 15 to 50%and by opening
Feedwater Block Valves, FWV-29 & FWV-30, and feedwater pump speed above 50%
flow. The switch over to the low-load flow control valves will be at the same mass flow
rate flow but at a slightly lower percentage of total feedwater flow. The block valves
opening will be at the same mass flow rate (6x10' Ibmhr) flow but at a slightly lower
percentage of total feedwater flow. The valve will pulse open to 15% and them ramp full
open. When the loop feedwater flow demand decreases to 45% of the loop flow range,
the associated main block valve will receive a close signal. The valve Wil ramp closed
to 17% open and then pulse to full dosed. The block valves dose of a main feedwater
isolation actuation signal.
The initial assessment is that the feedwater flow control and block valves are adequate
for EPU conditions. The developed feedwater pressure exiting !he feedwater pumps is
being raised from 1013 psia to 1092 psia. A hydraulic evaluation of the feedwater
system (FATHOM or equal) is being performed as part of the Phase 1 detailed design.
Verification of proper operation of the feedwater isolation valves at the maximum
differential pressure is required after the hydraulic analysis is complete. The feedwater
control and block valves require furlher evaluation of the MFP runback set point and
control oscillations after the final PEPSE and hydraulic models are complete.
The proposal for this task should include 1) an evaluation of the feedwater control
system setpoints and 2) an evaluation of the stability of the feedwater control system
and valves over the operating range of the system at EPU conditions.
1.9.1 2 Condenser Performance and Flow-Induced Vibration Calculations
Condenser performance requires evaluation using the final PEPSE results for 3030 MWt
including CW pump flow of 207,400 gpm each. In addition, a baseline case should be
evaluated for 2568 MWt and existing CW flow for baseline comparisons against current
plan1 data. A condenser flow-induced vibration evaluation is required using the final
3030 MWt results.
These evatuations are to be sub contracted to Heat Exchanger Services. The proposal
should include the cost for the HES analysis.
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PEF-NCK-02005