"Final Environmental Statement Related to the Operation of Nine

NUREG-1085 Final Environmental Statement related to the operation of Nine Mile Point Nuclear Station, Unit No. 2 Docket No. 50-410 Niagara Mohawk Power Corporation Rochester Gas and Electric Corporation Central Hudson Gas and Electric Corporation New York State Electric and Gas Corporation Long Island. Lighting Company U.S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation May 1985 ,gREG(, Docket*# 3 c6 FL___ DOCKETUz UGJATORY j , 3 ,-~ J NOTICE Availability of Reference Materials Cited in NRC Publications Most documents cited in NRC publications will be available from one of the following sources: 1. The NRC Public Document Room, 1717 H Street, N.W. Washington, DC 20555 2. The Superintendent of Documents, U.S. Government Printing Office, Post Office Box 37082, Washington, DC 20013-7982 3. 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NUREG-1085 Final Environmental Statement related to the operation of Nine Mile Point Nuclear Station, Unit No. 2 Docket No. 50-410 Niagara Mohawk Power Corporation Rochester Gas and Electric Corporation Central Hudson Gas and Electric Corporation New York State Electric and Gas Corporation Long Island Lighting Company U.S. Nuclear Regulatory Commission Office of Nuclear Reactor Regulation May 1985 ABSTRACT This Final Environmental Statement contains the assessment of the environmental impact associated with the operation of the Nine Mile Point Nuclear Station, Unit 2, pursuant to the National Environmental Policy Act of 1969 (NEPA) and Title 10 of the Code of Federal Regulations, Part 51, as amended, of the Nuclear Regulatory Commission regulations. This statement examines the environ- ment, environmental consequences and mitigating actions, and environmental and economic benefits and costs. NMP-2 FES ii i SUMMARY AND CONCLUSIONS This Final Environmental Statement (FES) was prepared by the U.S. Nuclear Regulatory Commission, Office of Nuclear Reactor Regulation (staff). (1) This action is administrative. (2) The proposed action is the issuance of an operating license to Niagara Mohawk Power Corporation (hereinafter referred to as the applicant) acting as agent and representati~ve for the owners (Niagara Mohawk Power Corporation, Central Hudson Gas and Electric Corporation, New York State Electric and Gas Corporation, Long Island Lighting Company, and Rochester Gas and Electric Corporation) for the operation of the Nine Mile Point Nuclear Station Unit 2 (NMP-2) (Docket No. 50-410). Nine Mile Point Nuclear Station Unit 2 is located in the Town of Scriba, County of Oswego, State of New York. Unit 2 will share the site with the applicant's operating Nine Mile Point Nuclear Station Unit 1.. The Nine Mile Point Nuclear Station site is contiguous to the James A. FitzPatrick Nuclear Power Plant site. The James A. FitzPatrick Nuclear Power Plant is owned and operated by the New York Power Authority. (3) The Nine Mile Point Nuclear Station Unit 2 will employ a boiling water reactor (BWR) that has a plant-rated core thermal power level of 3323 MWt, corresponding to an electrical output of approximately 1,100 MWe. All cooling water required for Unit 2 will come from and be discharged to Lake Ontario. The closed-loop circulating water system employs a single- cell, wet-evaporative, natural-draft cooling tower that uses a counterflow design. The lake intake system conveys required cooling water from Lake Ontario through two submerged intake structures that are independently connected to the screenwell by intake pipes in separate tunnels below the lake bottom. (4) The information in this statement represents the second assessment of the environmental impacts pursuant to the Commission's regulations in Title 10 of the Code of Federal Regulations, Part 51 (10 CFR 51), which implements the requirements of the National Environmental Policy Act of 1969 (NEPA). The Niagara Mohawk Power Corporation tenderedfan application for a construction permit (CP) on March 8, 1972. Because more information was needed for the initial filing, the application for a CP was not officially docketed for review until June 15, 1972. After the application for a CP was docketed, the staff reviewed impacts that would occur during station construction and operation. That evaluation was issued as a Final Environ- mental Statement - Construction Permit Phase (FES-CP) in June 1973. After this environmental review, a safety review, an evaluation by the Advisory Committee on Reactor Safeguards (ACRS), and a hearing before an Atomic Safety and Licensing Board (ASLB), the CP for Nine Mile Point Nuclear Station Unit 2 was issued on June 24, 1974. NMP-2 FES V The Niagara Mohawk Power Corporation acting as agent and representative for the owners, tendered an application for an operating license (OL) by letter dated January 31, 1983. The staff conducted a predocketing acceptance review and determined that sufficient information was available to begin the detailed environmental and safety reviews. The applicant's Environmental Report-Operating License stage (ER-OL) and Final Safety Analysis Report (FSAR) were docketed on April 12, 1983. (5) The NRC staff has reviewed the activities associated with the proposed operation of the plant and the potential impacts, both beneficial and adverse. The NRC staff's conclusions are summarized as follows: (a) NMP-2 will utilize state-of-the-art cooling system design to minimize the impacts to Lake Ontario aquatic biological resources as a result of the withdrawal of water and the discharge of effluents. The design will include: low intake volume and velocity; offshore submerged intake structures with velocity capped-horizontal inflow; a diversion and return system for entrapped fishes; and an offshore benthic diffuser discharge system. The fish diversion system will collect and return some fishes that will be impinged on the travel- ing screens; however, for certain size classes of some species (notably alewife and rainbow smelt), the reduction in impingement mortality may be low. Thermal and chemical effluent effects should be limited to a small area in the vicinity of the diffuser discharge. Impacts resulting from interactions between NMP-2 and either the. Nine Mile Point Unit 1 or FitzPatrick power plants should be insig- nificant. The conclusions of the 1981 NRC study of environmental impacts resulting from the conversion from once-through cooling to closed-cycle cooling remain valid (Section 5.5.2 and Appendix G of this report. (b) The operation of NMP-2 will have no impact on terrestrial or aquatic threatened or endangered species, because none occur within the project area (Section 5.6). (c) Operation of NMP-2 is expected to have a negligible effect on water use and quality in Lake Ontario. On an annual basis, consumptive losses from station operation will represent, respectively, approximately 0.001% and 0.009% of the volume of and flow through the lake. Water used from the Oswego City water supply will increase the demand on that supply by demand less than 0.4%. The concentration of dissolved solids in the discharge from the station will have been increased by evaporation and by water treat- ment and corrosion. The water in Lake Ontario already exceeds the state standard

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