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1-3 Noise

Please explain in detail the difference in expected noise levels between start up and shut down operations and normal operations.

RESPONSE

                   

CREC operation is expected to be typical of other base load power generation facilities and should be running at normal operating level more than 80% of the time. This means that start up and shut down will be somewhat frequent events occurring typically once a month during winter and summer conditions and once a week or even daily during the spring and fall. Noise produced from the various components will vary depending upon the plant load and its mode of operation. Noise produced from these components is from motors, pumps and ancillary equipment skids, as summarized in Table 1.3.1 which was included in the Noise Evaluation report included as Appendix E in the EFSB application and modified to show number of components operating or their percent load during normal and start up or shut down conditions.

 

Table 1.3.1:  Major Sources of CREC Noise

 

Equipment Description

*Denotes located indoors

Normal Operations[1]

Start Up/Shut Down

H Class combustion turbines

2

30%-50%

Steam Turbine generators

2

30%

Air Cooled Condenser (ACC) - 18 Cells

2

50%

Ammonia Forwarding Pump

1

50%

Ammonia Injection Skids

2

50%

Auxiliary Boiler Building

1

100%

Auxiliary Transformers

2

2

Boiler Feedwater Pumps

2

50%

Closed Cooling Water Heat Exchangers

2

2

Condensate Pumps

2

2

Combustion Turbine Air Inlet Filter Housings

2

2

Combustion Turbine Lube Oil Modules

2

2

Combustion Turbine Enclosure Ventilation Fans

2

2

Combustion Turbine Exhaust Diffusers

2

50%

Demin Water Pumps

2

25%

Fuel Gas Compressor After Coolers

2

1

Fuel Gas Dew Point Heater

1

1

Fuel Gas Metering and Regulating Station

1

1

Generator Step-Up Transformers

2

2

Heat Recovery Steam Generators (HRSG)

2

50%

Steam Turbine Bypass Valves

0%

6

HRSG Duct Burner Skids

2

0%

HRSG Exhaust Stack

2

50%

HRSG Piping and Valve Systems

2

50%

Miscellaneous Small Transformers

8

8

Roof-Mounted HVAC Fans

21

21

Scanner Cooling Air Blowers

2

0%

Service Water Pump

1

1

Vacuum Pumps

2

1

Waste Water Pump

1

1

 

The above table indicates the expected number of components that will operate during normal conditions and during start up and shut down. The expected noise for these two modes of operation and other transient modes of operation is included in the response to Question 1.5 below.

 

 

RESPONDENT:

 

 

Mike Hankard, Senior Acoustical Consultant, Michael Theriault Acoustics, Inc. and John Niland, Director, Business Development, Invenergy

 

DATE:

March 31, 2016

   

 

[1] - Quantity active during full load operation.  For pumps and compressors installed in sets of 2 or 3, it is assumed that one set will be reserved for backup and remain on standby.