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{{#Wiki_filter:LaSalle Environmental AuditResponse to Request for Additional InformationIndex #: 008 RAI #: MA-08 Category: Meteorology, Air Quality & NoiseStatement of Question:In support of NRC's greenhouse gas, climate change, and cumulative impacts analysis, addressthe following:a. Has a river warming trend been observed in the Illinois River during the period of plantoperations? Please provide any study(s), relevant information, or historical and currentdata that covers the last 20 years that support the conclusions reached (e.g., meanannual, seasonal, and/or or monthly water temperature trend for the period of record).b. Has a warming trend been observed in the cooling pond during the period of plantoperations? Please provide any study(s), relevant information, or historical and currentdata that covers the last 20 years that support the conclusions reached (e.g., maximumobserved water temperature values and date of occurrence, mean annual, seasonal,and/or or monthly water temperature trend for the period of record).Response:a. LSCS Units 1 and 2 began operating in January and October, 1984, respectively. LSCShas not maintained a long-term computer database of river water temperatures. Thenearest downstream U.S. Geological Survey (USGS) gaging station (05543500) on theIllinois River with temperature data is at Marseilles, Illinois, approximately 4.5 km (3 mi)downstream of the LaSalle discharge (blowdown). The following table identifies thetemperature data collected by the USGS at that gaging station. Given that only fieldmeasurements of temperature are available, and given that these measurements havebeen taken irregularly as part of monthly grab samples over the 44-year period of record,the available USGS river temperature data set does not lend itself to any temperaturetrend analysis.Description of Illinois River Temperature DataAvailable from USGS Gaging Station 05543500 (Marseilles, Illinois)Type of data Time period NotesSingle (presumably 1970 -present Measured in the field in association withsurface) monthly grab samples In total, 1153 watertemperature; temperature measurements have been takenrecorded monthly, at since October 1970, approximately 26 pera minimum year."water temperature" water years USGS 2013 water-data report for station1975 -1981 05543500 (Illinois River at Marseilles) lists'WATER TEMPERATURE: water years 1975-1981" under Surface Water Records,however, the historic data available at theUSGS website do not include watertemperature.01 | {{#Wiki_filter:LaSalle Environmental AuditResponse to Request for Additional InformationIndex #: 008 RAI #: MA-08 Category: Meteorology, Air Quality & NoiseStatement of Question:In support of NRC's greenhouse gas, climate change, and cumulative impacts analysis, addressthe following:a. Has a river warming trend been observed in the Illinois River during the period of plantoperations? Please provide any study(s), relevant information, or historical and currentdata that covers the last 20 years that support the conclusions reached (e.g., meanannual, seasonal, and/or or monthly water temperature trend for the period of record).b. Has a warming trend been observed in the cooling pond during the period of plantoperations? Please provide any study(s), relevant information, or historical and currentdata that covers the last 20 years that support the conclusions reached (e.g., maximumobserved water temperature values and date of occurrence, mean annual, seasonal,and/or or monthly water temperature trend for the period of record).Response:a. LSCS Units 1 and 2 began operating in January and October, 1984, respectively. LSCShas not maintained a long-term computer database of river water temperatures. Thenearest downstream U.S. Geological Survey (USGS) gaging station (05543500) on theIllinois River with temperature data is at Marseilles, Illinois, approximately 4.5 km (3 mi)downstream of the LaSalle discharge (blowdown). The following table identifies thetemperature data collected by the USGS at that gaging station. Given that only fieldmeasurements of temperature are available, and given that these measurements havebeen taken irregularly as part of monthly grab samples over the 44-year period of record,the available USGS river temperature data set does not lend itself to any temperaturetrend analysis.Description of Illinois River Temperature DataAvailable from USGS Gaging Station 05543500 (Marseilles, Illinois)Type of data Time period NotesSingle (presumably 1970 -present Measured in the field in association withsurface) monthly grab samples In total, 1153 watertemperature; temperature measurements have been takenrecorded monthly, at since October 1970, approximately 26 pera minimum year."water temperature" water years USGS 2013 water-data report for station1975 -1981 05543500 (Illinois River at Marseilles) lists'WATER TEMPERATURE: water years 1975-1981" under Surface Water Records,however, the historic data available at theUSGS website do not include watertemperature.01 | ||
: b. LSCS circulating water inlet temperatures are logged in the plant operating data system.However, maintenance of the data in a computerized database did not begin until 1998.Attachment 1 to this RAI response provides a graph of the daily circulating watertemperatures collected at 00:00 each day. No increasing trend in these temperatures isvisually apparent.List of Attachments:1. Graph of LaSalle Circulating Water Inlet Temperature Data from Oct 1998 to Dec2014.2 RAI # MA-08ATTACHMENT 1 CW Temp Trending1201008060CLE= 40200-Unit 1 CW Intake Temp-Unit 2 CW Intake TempIIIIIII- I------ ,----- _____4Date | : b. LSCS circulating water inlet temperatures are logged in the plant operating data system.However, maintenance of the data in a computerized database did not begin until 1998.Attachment 1 to this RAI response provides a graph of the daily circulating watertemperatures collected at 00:00 each day. No increasing trend in these temperatures isvisually apparent.List of Attachments:1. Graph of LaSalle Circulating Water Inlet Temperature Data from Oct 1998 to Dec2014.2 RAI # MA-08ATTACHMENT 1 CW Temp Trending1201008060CLE= 40200-Unit 1 CW Intake Temp-Unit 2 CW Intake TempIIIIIII--4-I------ ,----- _____4Date}} | ||
}} | |||
Revision as of 23:31, 6 June 2018
| ML15195A352 | |
| Person / Time | |
|---|---|
| Site: | LaSalle  |
| Issue date: | 07/02/2015 |
| From: | Exelon Generation Co |
| To: | Office of Nuclear Reactor Regulation |
| Shared Package | |
| ML15195A351 | List:
|
| References | |
| RS-15-179, TAC MF5567, TAC MF5568 | |
| Download: ML15195A352 (4) | |
Text
LaSalle Environmental AuditResponse to Request for Additional InformationIndex #: 008 RAI #: MA-08 Category: Meteorology, Air Quality & NoiseStatement of Question:In support of NRC's greenhouse gas, climate change, and cumulative impacts analysis, addressthe following:a. Has a river warming trend been observed in the Illinois River during the period of plantoperations? Please provide any study(s), relevant information, or historical and currentdata that covers the last 20 years that support the conclusions reached (e.g., meanannual, seasonal, and/or or monthly water temperature trend for the period of record).b. Has a warming trend been observed in the cooling pond during the period of plantoperations? Please provide any study(s), relevant information, or historical and currentdata that covers the last 20 years that support the conclusions reached (e.g., maximumobserved water temperature values and date of occurrence, mean annual, seasonal,and/or or monthly water temperature trend for the period of record).Response:a. LSCS Units 1 and 2 began operating in January and October, 1984, respectively. LSCShas not maintained a long-term computer database of river water temperatures. Thenearest downstream U.S. Geological Survey (USGS) gaging station (05543500) on theIllinois River with temperature data is at Marseilles, Illinois, approximately 4.5 km (3 mi)downstream of the LaSalle discharge (blowdown). The following table identifies thetemperature data collected by the USGS at that gaging station. Given that only fieldmeasurements of temperature are available, and given that these measurements havebeen taken irregularly as part of monthly grab samples over the 44-year period of record,the available USGS river temperature data set does not lend itself to any temperaturetrend analysis.Description of Illinois River Temperature DataAvailable from USGS Gaging Station 05543500 (Marseilles, Illinois)Type of data Time period NotesSingle (presumably 1970 -present Measured in the field in association withsurface) monthly grab samples In total, 1153 watertemperature; temperature measurements have been takenrecorded monthly, at since October 1970, approximately 26 pera minimum year."water temperature" water years USGS 2013 water-data report for station1975 -1981 05543500 (Illinois River at Marseilles) lists'WATER TEMPERATURE: water years 1975-1981" under Surface Water Records,however, the historic data available at theUSGS website do not include watertemperature.01
- b. LSCS circulating water inlet temperatures are logged in the plant operating data system.However, maintenance of the data in a computerized database did not begin until 1998.Attachment 1 to this RAI response provides a graph of the daily circulating watertemperatures collected at 00:00 each day. No increasing trend in these temperatures isvisually apparent.List of Attachments:1. Graph of LaSalle Circulating Water Inlet Temperature Data from Oct 1998 to Dec2014.2 RAI # MA-08ATTACHMENT 1 CW Temp Trending1201008060CLE= 40200-Unit 1 CW Intake Temp-Unit 2 CW Intake TempIIIIIII--4-I------ ,----- _____4Date