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ER: Chapter 5.0 5.0 ENVIRONMENTAL IMPACTS OF STATION OPERATION NMP3NPP 5–1 Rev. 1 © 2008 UniStar Nuclear Services, LLC. All rights reserved. COPYRIGHT PROTECTED ER: Chapter 5.0 Land Use Impacts 5.1 LAND USE IMPACTS The following sections describe the impacts of Nine Mile Point 3 Nuclear Power Plant (NMP3NPP) operations on land use at the site, the 6 mi (10 km) vicinity, and associated transmission line corridors, including impacts to historic and cultural resources. The operation of NMP3NPP is not anticipated to affect any current or planned land uses. 5.1.1 THE SITE AND VICINITY Land use impacts from construction are described in Section 4.1.1. The only additional impacts to land use from operations will be the impacts of solids deposition from cooling tower drift. The cooling system for NMP3NPP will be a circular mechanical draft cooling tower. The tower will be approximately 177 feet (54 m) high with an overall diameter of 546 feet (166.4 m). Nine Mile Point Nuclear Station (NMPNS) will withdraw approximately 49.6 million gallons per day (187.8 Mega liters per day) from the Lake Ontario. The cooling tower system will occupy an area of approximately 10 acres (4 hectares). Details of cooling tower design are discussed in Section 3.4.2 and impacts of the heat dissipation system, including salt deposition, are discussed further in Sections 5.3.3.1 and 5.3.3.2. The cooling tower for NMP3NPP will be located south-southeast of the NMP3NPP power block. The cooling tower will be approximately 4,000 ft (1219 m) from the center of the tower to the nearest site boundary to the east and approximately 900 ft (274 m) to the closest portion of the shore of Lake Ontario. The cooling tower plume could occur in all compass directions. The maximum salt deposition rate from the cooling tower is provided in Table 5.3-9. The maximum predicted salt deposition rate is below the NUREG-1555 (NRC, 1999) significance level for possible vegetation damage of 8.9 lbs per acre per month (10 kg per hectare per month) in all directions from the cooling tower, during each season and annually. Therefore, impacts to vegetation from the salt deposition are not expected for both on-site and off-site locations. The average plume length and height was calculated from the frequency of occurrence for each plume by distance from the tower. The average plume length will range from 2.6 miles (4.2 km) to the east in the summer, to 3.2 miles (5.2 km) to the north in the winter. The annual average plume length will be 2.3 miles (3.7 km) to the east. The average plume height in the winter will range from 2159 ft (654 m) in winter to 2932 ft (888 m) in the summer. The annual average plume height will be 1828 ft (554 m). Due to the varying directions and short average plume length, impacts from the larger plumes would be SMALL and not warrant mitigation. The electrical switchyard for NMP3NPP will be located approximately 2,100 ft (640 m) to the south-southeast of the proposed location for the Circulating Water System (CWS) cooling tower A maximum predicted solids deposition rate of 0.0071733 lb/acre per month (0.008038212 kg/hectare per month) is expected at the NMP3NPP switchyard during the fall season. Additionally, the electrical switchyard for NMP Unit 1 and Unit 2 is located approximately 1500 ft (457 m) to the east from the proposed location of the NMP3NPP CWS cooling tower. The maximum predicted solids deposition expected at the NMP Unit 1 and Unit 2 electrical switchyard due to operation of the NMP3NPP CWS cooling tower will be 0.0002366 lbs per acre per month (0.000265128 kg per hectare per month) during the summer season. Salt deposition rates are presented in Table 5.3-9. Based on industry experience, adjustments to maintenance frequencies (e.g., insulator washing) may be necessary due to solids deposition; however, the expected deposition rates NMP3NPP 5–2 Rev. 1 © 2008 UniStar Nuclear Services, LLC. All rights reserved. COPYRIGHT PROTECTED ER: Chapter 5.0 Land Use Impacts will not affect switchyard component reliability or increase the probability of a transmission line outage at NMP Unit 1 and Unit 2, or NMP3NPP. Impacts from salt deposition from the NMP3NPP cooling tower would be SMALL. The modeling predicts salt deposition at rates below the NUREG-1555 significance level of 8.9 lbs per acre per month (10.0 kgs per hectare per month), Section 5.3.3.2, Terrestrial Ecosystems, presents information on the sensitivity of specific species to salts. Land use at the NMP3NPP site is indicated in Table 5.1-1. Shrub and brush lands are the most common land use at the NMP3NPP site, representing 27.7% of the NMP3NPP site acreage. Heavy manufacturing is the next highest land use area classification at the NMP3NPP site. The heavy manufacturing area represents 20.9% of the NMP3NPP site acreage. Land use data for the 6.0 mi (10 km) site vicinity is presented in Table 5.1-2. Lake water is the largest land use category and represents 62.4% of the area in the 6.0 mi (10 km) site vicinity radius. Shrub and brush rangeland is the next largest land use and represents approximately 18.9% of the land area. Section 2.2.1 presents land use on the NMP3NPP site and its vicinity extending 6 mi (10 km) beyond the site boundary and includes maps showing land use and transportation routes. As described in Section 2.5, the impact evaluation assumes that the residences of NMP3NPP employees will be distributed across the region in the same proportion as those of the NMP Unit 1 and Unit 2 employees. It is estimated that an additional operational work force of 363 on-site employees will be needed for NMP3NPP. Section 5.8.2 describes the impact of new employees on the region's housing market and the increases in tax revenues. All of the new employees are expected to settle in Oswego and Onondaga Counties. Most of the current NMP Unit 1 and Unit 2 employees live in Oswego County. The area is rural, with utilities and amenities generally supplied by the townships in the county. It is likely that the new employees who choose to settle near the NMP3NPP site will purchase homes or acreage in the Oswego County and Onondaga County area. There is excess capacity to house new workers; as of 2000, there were approximately 7,309 vacant housing units. No land is owned by the Federal government in Oswego County. However, there is some land within the vicinity in Oswego County and Onondaga County owned by the Federal government and unavailable for development. It is therefore concluded that impacts to land use in the vicinity will be SMALL and not warrant mitigation. 5.1.2 TRANSMISSION CORRIDORS AND OUTSIDE AREAS As discussed in Section 2.2.2, the additional electricity generated from NMP3NPP will not require the addition of new off-site transmission lines. The existing 345 kV transmission system provides power to the existing nuclear plants (NMP Unit 1 and Unit 2, and James A. FitzPatrick Nuclear Power Plant) as follows: 1. The Clay substation currently supplies the NMP Unit 1 switchyard with a 345 kV transmission line, and 2. The Scriba substation currently supplies the NMP Unit 1 switchyard, NMP Unit 2, and the James A FitzPatrick Nuclear Power Plant (NPP) each with a separate 345 kV transmission line, NMP3NPP 5–3 Rev. 1 © 2008 UniStar Nuclear Services, LLC. All rights reserved. COPYRIGHT PROTECTED ER: Chapter 5.0 Land Use Impacts The following modifications will be provided to connect NMP3NPP to the existing transmission system: One new 345 kV switchyard will be built on the NMP3NPP site. The NMP3NPP connection to this switchyard consists of six overhead lines. This new NMP3NPP switchyard will be connected by a 345 kV line from the Clay substation, a 345 kV line from the Scriba Substation (which is owned by National Grid, but is located within the NMPNS site owner controlled area), and a 345 kV line from the NMP Unit 1 switchyard. The existing 345 kV line from Clay will be disconnected from NMP Unit 1 and connected to the new NMP3NPP switchyard. The NMP3NPP switchyard will be connected to the NMP Unit 1 switchyard by a 1030 MVA line on individual towers. The NMP3NPP switchyard will be connected to the Scriba switchyard by a new 345 kV transmission line. An area transmission map is presented in Figure 1.2-5. Numerous breaker upgrades and associated modifications will also be required at Scriba and Volney substations, but all of the changes will be implemented within the boundaries of the existing substations. The transmission lines will be designed with adequate separation from other transmission lines to minimize the likelihood of simultaneous failure under postulated accidents and adverse environmental conditions. There will be no operational impact to land use along the corridors as the result of the proposed action. The on-site transmission line work necessary to support NMP3NPP will require a transmission line to connect a new switchyard for NMP3NPP to the existing NMP Unit 1switchyard. Line routing will be conducted to avoid or minimize impact on the existing Independent Spent Fuel Storage Installation, wetlands, and threatened and endangered species identified in the local area. No new operational land use impacts will occur as the result of the operation of the new segments of transmission lines or the NMP3NPP substation.