siemens - Public Service Commission

Progress Energy Crystal River Unit 3
Request for Proposal for Engineering Services to Upgrade Secondary System
6/25/2007
1 9.7 Secondary Services Closed Cycle Cooling System Modifications
The Secondary Services Closed Cycle Cooling System (SC) provides cooling water flow
to various secondary plant loads including the Turbine Generator, Condensate Pumps,
Lube Oil Coolers, Air Removal System, Instrument Air System and Station Air System.
It also provides backup cooling to the Control Complex Chillers upon loss of SW. The
SC system consists of two main heat exchangers (SCHE-IA, le) and two main pumps
(SCP-IA, 1 e).
Currently the SC system is rated for 54 Mbtuhr and the flow rate is 10,000 gpm. The
new generator heal loads (which account for the majority SC system heal load) are
expected to produce about 58.9 Mbtulhr based on 1200 MVA and 430 MVAR (0.933 pf).
Based on the generator heat load increase, the total SC heat for EPU conditions is
projected to be between 75 Mbtulhr and 80 Mbtulhr. The SC system will need to
increase its heat removal capacity to handle the increased heat load due to planned
power uprate and to restore margin.
By relocating piping and small obslructions, sufficient space is available to install new
SC heat exchangers with over all dimensions of 66 inches outside diameter and 54 feet
in length. The actual heat exchanger sizing shall maximize the heat transfer capacity of
the heat exchangers based on the existing space limitations. Likewise, the size SC
pump impeller and motor will be increased to maximize SC flow so the new heal
exchanger specifications must be coordinated with the new SC pump maximum flow
rate.
Maximization of the Secondary Services Closed Cycle Cooling System
Due to the increased heat loads on this system, it is required to maximize the heat
removal capability of the system, This evaluation must determine the maximum capacity
and cooling flow of the secondary cooling heat exchangers based on exisling space
limitations. This evaluation must also determine the maximum SC system flow by
replacing the SC pump impellers and motors.
Replacement of the SC Heat Exchangers
Revision of the SC heat exchanger specification is required. Procedures EGR-NGGC-
0020, Preparation and Control of Specifications, MCP-NGGC-0401, Material Acquisition
(Procurement, Receiving, Shipping), NUA-and NGGC-1530, Equipment, Pressure Test,
Protective Coatings, and Special Process Inspections are applicable to this task.
Two EC packages are required, one to procure the two new SC heat exchangen and a
separate EC package to install these new heat exchangers in the plant. Procedure
EGR-NGGC-0005, Engineering Change describes the sleps necessary to prepare an
EC package.
Replacement of the SC Pumps and Motors
Revision of the SC pump and motor specification is required. The specification shoutd
include a requirement to maximize the motor efficiency to offset the impact on the
electrical distribution system. Procedures EGR-NGGC-0020, Preparation and Control of
Specifications, MCP-NGGC-0401, Material Acquisition (Procurement, Receiving,
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PEF-NCR-01998