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2-1 Noise

Could you please explain the source or derivation of the values specifically associated with the following sources:

2-1       Table 1 on Page 7 of Appendix A (“Transient Operation Noise Level Evaluation for the Clear River Energy Center”, Michael Theriault Acoustics, Inc., March 2016) contains the expected near field sound pressure levels at various points along the air cooled condenser (ACC) duct during steam turbine bypass.  Could you please explain the source or derivation of the values specifically associated with the following sources:                     

  1. ACC Main Horizontal Ducts
  2. ACC Riser Ducts
  3. ACC Finger Ducts     
  4. HRH Steam Bypass Ducts
  5. LP Steam Bypass Ducts

Invenergy Resp. 2-1:

 

The source of values for the various ducts listed in Table 1 on Page 7 of Appendix A (“Transient Operation Noise Level Evaluation for the Clear River Energy Center”, Michael Theriault Acoustics, Inc., March 2016) was based on a combination of:

 

  1. Field measurements of ACC ducts at a similarly designed, combined-cycle combustion turbine energy center while in steam turbine bypass mode during startup operations; and
  2. Manufacturer’s noise level data for ACC duct radiated noise using low-noise bypass valve systems under specific start-up flow conditions for the equipment proposed at the site.

                              

Respondent:

 

Michael Theriault, Michael Theriault Acoustics, Inc.

Date:

April 20, 2016