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  • Independent Third-Party Interim Technical Assessment for the Offshore Modular Wedge Wire Screens for San Onofre Nuclear Generating Station Report No. 25761-000-30R-G01G-00002

    BECHTEL P BECHTEL POWER CORPORATION. REPORT ISSUED JULY 11, 2012 I

    Independent Third-Party Interim Technical Assessment

    for the

    Offshore Modular Wedge Wire Screens for San Onofre Nuclear Generation Station

    Prepared by:

    Bechtel Power Corporation

    Revision Date Affected Sections 0 July 11, 2012 Initial Issue

  • Independent Third-Party Interim Technical Assessment for the Offshore Modular Wedge Wire Screens for San Onofre Nuclear Generating Station Report No. 25761-000-30R-G01G-00002

    BECHTEL P BECHTEL POWER CORPORATION. REPORT ISSUED JULY 11, 2012 II

    Contents

    List of Abbreviations and Acronyms ......................................................................................................... iii 1. Executive Summary ...............................................................................................................................1 2. Background and Introduction...............................................................................................................2

    2.1 Purpose/Scope of Study..................................................................................................................2 2.2 Regulatory History .........................................................................................................................3

    2.2.1 Federal ................................................................................................................................3 2.2.2 State ....................................................................................................................................3

    2.3 Screening Process (A/B Criteria) ...................................................................................................5 3. Technology Description .........................................................................................................................5 4. Criterion Evaluation ..............................................................................................................................6

    4.1 External Approval and Permitting..................................................................................................6 4.2 Impingement/Entrainment Design................................................................................................13 4.3 Environmental Offsets..................................................................................................................14 4.4 First-of-a-Kind to Scale................................................................................................................19 4.5 Operability General Site Conditions ............................................................................................19 4.6 Seismic and Tsunami Issues.........................................................................................................20 4.7 Structural ......................................................................................................................................20 4.8 Construction .................................................................................................................................21 4.9 Maintenance .................................................................................................................................22

    5. Conclusion.............................................................................................................................................22 6. Appendixes............................................................................................................................................22

    6.1 Input Data.....................................................................................................................................23 6.2 References ....................................................................................................................................23 6.3 Sketches........................................................................................................................................24

    Table WW-1. Environmental Permit/Approval Assessment: Modular Wedge Wire Screen System San Onofre Nuclear Generating Station....................................25 Table WW-2. Offsetting Impacts for the Offshore Modular Wedge Wire Screen San Onofre Nuclear Generation Station....................................................................................................32 Figure WW-1. Offshore Wedge Wire Screens Concept Layout.............................................................35 Figure WW-2. Offshore Wedge Wire Screens Concept Layout.............................................................36 Figure WW-3. Sectional Viwe of Wedge Wire Screen Intake Modular Assembly ................................37

  • Independent Third-Party Interim Technical Assessment for the Offshore Modular Wedge Wire Screens for San Onofre Nuclear Generating Station Report No. 25761-000-30R-G01G-00002

    BECHTEL P BECHTEL POWER CORPORATION. REPORT ISSUED JULY 11, 2012 III

    List of Abbreviations and Acronyms

    BLM Bureau of Land Management Caltrans California Department of Transportation CDFG California Department of Fish & Game CEC California Energy Commission CEQA California Environmental Quality Act CPUC California Public Utility Commission EPCRA Emergency Planning and Community Right-To-Know Act EPRI Electric Power Research Institute FAA Federal Aviation Administration fps foot per second GWA Government of Western Australia mgd million gallons a day NOI Notice of Intent NPDES National Pollutant Discharge Elimination System NYSDEC New York State Department of Environmental Conservation OHP Office of Historic Preservation RC Resource Commission RCRA Resource Conservation Recovery Act RWQCB Regional Water Quality Control Board SCE Southern California Edison SDRWQCB San Diego Regional Water Quality Control Board SONGS San Onofre Nuclear Generating Station SPCC Spill Prevention and Countermeasure Control Program SWPPP Storm Water Pollution Prevention Plan SWRCB State Water Resources Control Board USACE U.S. Army Corp of Engineers USEPA U.S. Environmental Protection Agency WDR Waste Discharge Requirement

  • BECHTEL P BECHTEL POWER CORPORATION. REPORT ISSUED JULY 11, 2012 1

    Independent Third-Party Interim Technical Assessment for the Offshore Modular Wedge Wire Screens for

    San Onofre Nuclear Generating Station Report No. 25761-000-30R-G01G-00002

    1. Executive Summary

    This study summarizes the findings of the first phase of a detailed evaluation to assess the viability of the modification of the intake water system to add wedge wire screening technology to the once-through cooling system for the San Onofre Nuclear Power Station (SONGS), in support of the Nuclear Review Committees initiative to identify strategies to implement the California Statewide Policy on the Use of Coast and Estua-rine Waters for Power Plant Cooling, that is, strategies that comply with the Section 316b, California Once-Through Cooling Policy, Phase II rules. The design and use of wedge wire screens has been thoroughly evaluated within this report. The wedge wire technology affects impingement and entrainment reductions in three ways: (1) the screens act as a physical barrier to prevent aquatic organisms sufficiently larger than the screen slot size from being entrained, (2) sweeping current in the source water tends to move the aquatic organisms away from the entrained flow field and reduce impingement by moving organisms past the screen faces, minimizing direct contact with intake, and (3) hydrodynamic exclusion of early life stages results from the small through-slot velocity at the screens. There have been a number of past studies that evaluated effectiveness of wedge wire screens on improving impingement and entrainment loss. The wedge wire screen technology has been recognized by the industry and accepted by permitting agencies as having the ability to effectively reducing impingement mortality with proper engineering design. The wedge wire screen technology can be effective in reducing entrainment loss of juvenile and adult fish due to the physical barriers to entry afforded by the wire matrix. Its performance regarding entrainment reduction for larvae and eggs, however, is highly site-specific and is the subject of on-going assessments and debates. There is currently no site-specific assessment regarding the potential reduc-tion of entrainment impacts from the use of wedge wire screens that could adequately characterize the bene-fits. However, based on recent field evaluations, studies, and assessments for the cooling water intakes of other power facilities, it is expected that this technology will offer some level of entrainment protection for all life stages, assuming there is a focused screen site selection process that will avoid biologically sensitive and production areas and appropriate consideration of the local hydrodynamics of the source water to aug-ment the physical barrier of the screens.

    The external approval and permitting assessment for the wedge wire system identified a list of potentially applicable federal, state, and local permits and approvals that, not surprisingly, focused on its significant im-pacts to the marine environment. The efforts to conduct a successful California Environmental Quality Act (CEQA) and secure the U.S. Army Corp of Engineers (USACE) Section 404 permit, California Coastal Commission Coastal Development Permit, State Lands Commission Lease, National Pollutant Discharge Elimination System (NPDES) pe