ML043090286

Presentation Slides from the 11/03/2004 Meeting Between the Nuclear Regulatory Commission Staff and Sacramento Municipal Utility District Regarding the Rancho Seco Nuclear Generating Station License Termination Plan

ML043090286
Person / Time
Site:	Rancho Seco
Issue date:	11/03/2004
From:	Sacramento Municipal Utility District (SMUD)
To:	NRC/FSME
References
-RFPFR
Download: ML043090286 (50)

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Groundwater Levels Southern Sacramento County Spring 2003 Groundwater Levels Southern Sacramento County Fall 2003

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Information Requirements for RESRAD Modeling for RSGNS Parameter or Data Need RSGNS Data Availability Adequacy Rating Soil dry bulk density 39 measurements Inadequate; samples from limited area Soil total porosity 15 measurements Inadequate; samples from one boring Effective porosity No data; calculated from other Inadequate parameters Hydraulic conductivity 8 in unsaturated zone; 23 in saturated Inadequate; no data below 200 feet zone Volumetric water content 71 measurements Adequate -

Soil exponential b parameter No data Can be obtained from other parameters Hydraulic gradient - horizontal No data Inadequate Hydraulic gradient - vertical No data Inadequate Water table drop rate Data from existing subbasin wells Adequate Thickness of uncontaminated, Combined zones are approximately 150 Inadequate unsaturated zones<.

feet thick Potentiometric surface maps No data on site Inadequate Groundwater flow paths No data Can be estimated with hydraulic gradients Climatic, land use, and recharge impacts Data available for subbasin Adequate Surface water impacts on groundwater No data; groundwater 150 feet below Inadequate onsite along No Name creek surface and downstream Rate of groundwater movement Limited data to perform calculation Inadequate for entire aquifer; obtained from hydraulic conductivity and gradient Rate of contaminant transport No data Inadequate if contaminants are present; calculated from rate of groundwater movement Radionuclide presence and extent Limited data for soil or groundwater Inadequate Kd Partitioning coefficient No data To be derived with probabilistic calculations in RESRAD

Data for Wells On-Site and Downgradient from RSNGS Well ID Total Depth Screen Interval Water Use Monitored (ft bgs)

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11 Site well (SW-1) 410 156-400 RSNGS Yes 12 Marciel Ranch 250 NA Domestic Yes 13 Clay Cattle Feedlot NA NA Commercial Yes 14Tiplings-Clay Area 175 NA

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-49 Vineyard Well 785 NA Irrigation Yes 8 Silva Feedlot Well.

NA NA Commercial-Yes OW-1 187.8 172.7-182.7

None No OW-2 183 168.2-177.2 None No OW-3 192.9 176.8-187.2 None No

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Proposed Cluster Well Descriptions, Sampling, and Rationale Propos ed Locati on, Piez Identifi omet cation ers in (see the Figure Clust 4-1) er Sampling Rationale P1 3

East of SW-1 Obtain parameters for mathematical modeling.

Establish background concentrations; Groundwater: radionuclides and boron - sample in three Monitor static water levels at three depth successive quarters; then decide on need for additional intervals; sampling Monitor water levels when SW-1 is pumping at three depth intervals; P2 3

Soil: dry bulk density, total porosity, hydraulic conductivity West of Turbine Building.

Obtain parameters for mathematical modeling.

Groundwater: radionuclides and boron - sample in three Determine if contaminants are entering successive quarters; then decide on need for additional groundwater, at reactor turbine building, fuel sampling storage building Monitor water levels at three depth intervals P3 3

Soil: dry bulk density, total porosity, hydraulic conductivity Southwest of the reactor/ fuel storage building, near the transformer yard Obtain parameters for mathematical modeling Groundwater: radionuclides and boron - sample in three Determine if contaminants are entering successive quarters; then decide on need for additional groundwater, at reactor turbine building, fuel sampling storage building Monitor water levels at three depth intervals P4 1

Soil: dry bulk density, total porosity, hydraulic conductivity West of Retention Basins Obtain parameters for mathematical modeling; Groundwater: radionuclides and boron - sample in three Determine if contaminants are entering successive quarters; then decide on need for additional groundwater from leakage of discharge retention sampling basins Monitor water levels at one depth interval

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Proposed Cluster Well Descriptions, Sampling, and Rationale continued P5 3

Near western property boundary, 200 feet north of No-name creek; Groundwater: radionuclides and boron - sample in three Determine if contaminants are successive quarters; then decide on need for additional migrating from upgradient sources sampling Monitor water levels at three depth intervals P6 3

Near western property boundary, 100 feet south of No-name creek Groundwater: radionuclides and boron - sample in three Determine if contaminants are successive quarters; then decide on need for additional migrating from upgradient sources sampling Monitor water levels at three depth intervals P7 2

Near western property boundary, adjacent to OW-2 Groundwater: radionuclides and boron - sample in three Determine if contaminants are successive quarters; then decide on need for additional migrating from upgradient sources sampling Monitor water levels at two depth intervals here and one in OW-2

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