siemens - Public Service Commission

Progress Energy Crystal River Unit 3
Request for Proposal for Engineering Services to Upgrade Secondary System
612512007
1.9.2 MSR Replacement and MSR Belly Drain Heat Exchanger Addition
MSR Replacement
The turbine rotor supplier is providing new moisture separator reheaters. An
engineering change package is required to be prepared to support installation of the new
MSRs. As part of the task of preparing the EC package, evaluation of the MSR relief
valves is required. Procedure EGR-NGGC-0005, Engineering Change applies is this
task.
MSR Belly Drain Heat Exchanger Addition
Current CR3 plant configuration dumps the MSR belly drains directly to the condenser.
This design negatively impacts plant efficiency because a significant amount of energy is
dumped to the condenser. The BOP efficiency can be improved and energy recaptured
by installing heat exchangers in the MSR drains. It is expected that approximately 4
MWe will be gained in generator output. The figure below illustrates the concept of
recapluring the energy in the MSR belly drains before dumping to the condenser.
MSR Belly Draln Flow Diagram
The existing MSRs are not adequale for 3030 MWt and are being replaced. The
preliminary PEPSE model for 3030 MWI indicates lhat the MSR shell drain flow is
expected lo increase from 11% to 13% with a temperature increase to 392 'F from 377
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PEF-NCR-0 1989