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Environmental Impact Statement - radioactive monticello

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Description of Site and Environment<br />

I found that there were no indications of radiological effects of Monticello on the environment<br />

(NMC 2005d).<br />

A review of historical data on releases from Monticello and the resultant dose calculations<br />

revealed that the calculated doses to maximally exposed individuals in the vicinity of Monticello<br />

were a small fraction of the limits specified in the Monticello ODCM (NMC 2004b) to meet<br />

10 CFR Part 50, Appendix I design objectives, 10 CFR Part 20 dose limits, and EPA radiation<br />

standards in 40 CFR Part 190. For 2004, dose estimates were calculated based on actual<br />

liquid and gaseous effluent release data and conservative models to simulate the transport<br />

mechanisms. The results are described in the 2004 Radioactive Effluent Release Report (NMC<br />

2005e). A breakdown of the calculated maximum dose to an individual located at the Monticello<br />

boundary from liquid and gaseous effluents released during 2004 is summarized as follows:<br />

" The maximum whole-body dose to offsite member of the general public from liquid effluents<br />

was 1.94 x 10"10 mrem, well below the 3 mrem dose design objective in 10 CFR Part 50,<br />

Appendix I.<br />

* The maximum whole-body dose to the likely most exposed member of the general public<br />

from gaseous effluents was 0.022 mrem, well below the 5 mrem dose design objective in<br />

10 CFR Part 50, Appendix I.<br />

The applicant does not anticipate any significant changes to the <strong>radioactive</strong> effluent releases or<br />

exposures from Monticello operations during the renewal period and, therefore, the impacts to<br />

the environment are not expected to change.<br />

2.2.8 Socioeconomic Factors<br />

2.2.8.1 Housing<br />

Approximately 414 permanent employees and 105 contract and matrixed employees work at<br />

Monticello (NMC 2005a). Approximately 41 percent of these employees live in Wright County,<br />

32 percent live in Sherburne County, 7.5 percent live in Hennepin County, and 7.5 percent live<br />

in Stearns County. The remaining employees (approximately 12 percent) live in various other<br />

locations (NMC 2005a). Given the predominance of NMC and NSP employees living in Wright<br />

County and Sherburne County, as well as the absence of the likelihood of significant<br />

socioeconomic effects in other locations, the focus of the analysis undertaken in this<br />

supplemental environmental impact statement (SEIS) are on these counties.<br />

I NMC refuels Monticello on a nominal 22- to 24-month cycle. During refueling outages, site<br />

employment increases by as many as 600 temporary workers for 30 to 40 days. Many of these<br />

workers are assumed to be temporarily located in the same geographic areas as the permanent<br />

staff.<br />

NUREG-1437, Supplement 26 2-30 August 2006 1

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