ML081610195

Final Status Survey Report - Third Submittal

ML081610195
Person / Time
Site:	Rancho Seco
Issue date:	05/14/2008
From:	Redeker S Sacramento Municipal Utility District (SMUD)
To:	John Hickman Document Control Desk, NRC/FSME
References
MPC&D 08-032
Download: ML081610195 (22)

Text

OSMUD SACRAMENTO MUNICIPAL UTILITY DISTRICT PThe Power To Do More.

P.O. Box 15830, Sacramento, CA 95852-1830; 1-888-742-SMUD (7683)

MPC&D 08-032 May 14, 2008 U.S. Nuclear Regulatory Commission Attn.: Document Control Desk Washington, DC 20555 Docket No. 50-312 Rancho Seco-Nuclear Generating Station License No. DPR-54 RANCHO SECO FINAL STATUS SURVEY REPORT - THIRD SUBMITTAL Attention: John Hickman Attached is the Final Status Survey (FSS) Report for several of the Rancho Seco survey units.

Specifically, this submittal addresses dismantlement and FSS information for the survey units associated with the 100000, 200000, 501000, 800004, 800007, 800012, 800014, 813000, 823000, 826000, 832000, 839000, 843000, 848000, 851000, 857000, and 899000 areas. Table 1 of the FSS Report provides a description of the survey units addressed in this submittal. The report provides a summary of the survey results and concludes that survey units covered in this report meet the radiological criteria for unrestricted use.

Members of your staff with questions requiring additional information or clarification may contact Bob Jones at (916) 732-4843.

Sincerely, Steve Redeker Manager, Plant Closure & Decommissioning Cc w/ attachment: NRC Region IV RANCHO SECO NUCLEAR PLANT

• 14440 Twin Cities Road, Herald,CA 95638-9799; (209) 333-2935

RANCHO SECO FSS FINAL REPORT Final Status Survey Report 3 May 15, 2008 1

FSS FINAL REPORT Final Status Survey Report 3 1.0 Overview As discussed in Section 1.4 of the Rancho Seco License Termination Plan (LTP), SMUD intends to release the Rancho Seco site for unrestricted use in two phases, with the license being terminated after completion of the second phase. The first phase includes the release of the majority of the site, including impacted and non-impacted areas, except for the Interim Onsite Storage Building (IOSB) and the area immediately surrounding it.

Once an area has been verified as ready for release, no additional surveys or decontamination of the area will be required unless the controls (e.g., administrative or engineered) established to prevent re-contamination have been compromised.

SMUD will continue to store Class B & C radioactive waste in the IOSB until an acceptable disposal facility becomes available. After disposing of-the Class B & C radioactive waste, SMUD Will complete the final status survey for the remainder of the site (i.e., the area immediately surrounding the IOSB) and will submit a license amendment request to terminate the 10 CFR Part 50 license and release the remainder of the site for unrestricted use. The spent nuclear fuel and the Greater than Class C (GTCC) waste are stored at the Rancho Seco Independent Spent Fuel Storage Installation (ISFSI),

which is licensed under 10 CFR Part 72, independent of the 10 CFR Part 50 licensed site.

Section 1.4 of the LTP discusses the information to be provided to support release of land from the Rancho Seco 10 CFR Part 50 license. The information provided in this report includes a discussion of dismantlement activities performed, final status survey results, and an evaluation of the potential for re-contamination and controls applied to prevent this for each survey unit completed.

The information contained in this submittal, together with the information to be provided in subsequent FSS reports, will be sufficient for the NRC to conclude that, for the land and structures associated with the release, dismantlement has been performed in accordance with the approved license termination plan, and the terminal radiation survey and associated documentation demonstrates that the facility and site are suitable for release in accordance with the criteria for decommissioning in 10 CFR Part 20, Subpart E by meeting a site release criterion of 25 millirem TEDE peryear over background.

Once these lands and structures are released, no additional surveys or decontamination of these areas will be required unless the NRC determines that the criteria of 10 CFR Part 20, Subpart E were not met.

2.0 Site Information and Physical Description 2

2.1 Physical Description of Land or Structures to be Released The land and structures to be released will be described. inthe application for license amendment andis unchanged by this submittal.

2.1.1 Survey Unit Information Included in this Submittal As discussed in section 1.0 above, this submittal provides detailed discussion on demolition activities completed and final status survey results for 57 survey units located on the site to be released. Details are provided for each survey unit on survey methods, results, data analysis, and conclusions. Additional information on all other applicable survey units for the site will be provided in subsequent submittals. In all cases, Rancho Seco is providing a complete package of information relating to each survey unit.so that the NRC staff can verify that the License Termination Plan has been fully implemented for each survey unit and that the final status survey results support unrestricted release of the land from License DPR-54 in accordance with the proposed license amendment.

This submittal addresses dismantlement and FSS information for survey units associated with the 100000, 200000, 501000, 800004, 800007, 800012, 800014, 813000, 823000, 826000, 832000, 839000, 843000, 848000, 851000, 857000, and 899000 areas. Table 1 provides a description of the survey units addressed in this submittal.

Table 1 Survey Unit Class General Description of Survey Unit F 1000001-3 2 100000 Effluent Corridor- The effluent corridor consisted of the open land area bordering "No Name Creek" which was the liquid effluent pathway during plant operation.

The survey units had surface areas of 8339, 7744, and 5202 m2 respectively.

F1000004 1 1000004 Effluent Corridor- This survey unit was a separate class I area which resulted from the investigation of elevated measurements within F1I000001. The survey unit had a surface area of 198 m2.

F2000001 3 2000001 South Outfall- The South Outfall bordered the southern boundary of the Industrial Area and the eastern boundary of the Effluent Corridor. It incorporated the Storm .Drain Buffer Zone (800006). Storm water was released within this area. The survey unit had a surface area of 226,567 M2 .

F5010031 3 5010031 Upper/Outer Yard Pavement- The Upper/Outer Yard is a paved area surrounding the site of the demolished Hazardous Waste Building. The paved area is 2665 m2.

F5010032 3 5010032 Hazardous Waste Bid Pad- The Hazardous Waste Building Pad was the concrete foundation of the building used to temporarily store hazardous waste on site. The building itself was demolished leaving only the 3

foundation. The survey unit had a surface area of 268 M 2.

F5010041 3 5010041 Extended Parking Area- The Extended Parking Area is located outside the IA on the north-east side of the site. It was used for contractor parking as well as temporary parking for radwaste shipments. The soil area is 42735 M 2 .

F5010042 3 5010042 Extended Parking Area- The Extended Parking Area is located outside the IA on the north-east side of the site. It was used for contractor parking as well as temporary parking for radwaste shipments. The paved area is 38692 m2.

F8000041 3 8000041 Central Transit Area- The Central Transit Area was the primary north to south corridor through the 2

industrial area of the site. The area is 6634 mn .

F8000071 3 8000071 West Industrial Area- The West Industrial Area consisted of both soil and paved areas. It was located just north of the retention basins and ran along the west fence to the spray ponds on the north side of the site. The survey unit soil area is 65776 m2 and the pavement area is 22 5759 m2 .

F8000121 3 8000121 Industrial Area Waste Storage Buffer Zone- The IA Waste Storage Buffer Zone consisted of both soil and pavement located around the IOSB and barrel farm. The 2

combined area was 6114 in .

F8000141 3 8000141 North IA Soil- The North IA Area is the open land to the north of the spray ponds. The soil area is 6410 m2.

F813000 Typically 813000 Auxiliary Building- The Auxiliary Building class 1 contained the systems used to transport, process and floor, lower contain radioactive solids, gases and liquids. The surveys walls and presented in this submittal are for the following rooms class 2 located on the -20', +20', and grade elevation:

upper 3,13,14,16,17,24,26,27,104-135,111 ,112,113 ,114,115, walls, 206,207, and the mezzanine roof.

ceiling F8230001 3 8230001 Intake Pump Structure- The Intake Pump Structure was the concrete support structure for the circulating water pumps located just south of the cooling towers. The survey area is 402 M 2 .

F8261002 3 8261002 LP Turbine Pedestal-The LP Turbine Pedestal was the concrete support structure for the low pressure.

turbine. It extended from grade level to the 40' elevation of the Turbine Building. The area is 996 M 2 .

F8320001 3 8320001 Diesel Fuel Oil Pad Area- The Diesel Fuel Oil Pad Area is the former location of a concrete foundation pad that supported the fuel oil tank located north of the warehouse. The area is 1560 M2 .

F8390001 3 8390001 Transformer Yard- The Transformer Yard contained the main station transformers. The yard consists of the concrete pads upon which the transformers sat and the surrounding gravel and rock-covered area.

1-The area is 3385 m2 .

F8430011,21 3 8430011,21 Barrel Farm- The Barrel Farm was a paved area surrounded by an earthen berm used to store radwaste containers. It was located south of the IOSB.

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The barrel farm area is 1313 m2 and the berm is 5000 m2 .

F8480021 3 848000 Retention Basin Buffer Zone- The Retention Basin Buffer Zone was the buffer area surrounding the Retention Basins. The area was 10845 M 2 .

F8480011 8480011 North Retention Basin- The North Retention Basin was one of two concrete-lined holding ponds for the liquid effluent prior to its release offsite. The area is 1432 m2.

F8480012 8480012 South Retention Basin- The South Retention Basin was one of two concrete-lined holding ponds for the liquid effluent prior to its release offsite. The area is 1388 m2.

F8480017 3 8480017 Retention Basin Surface Soil- The Retention Basin Surface Soil was the "as lefi" surface soil following demolition and backfilling of the retention basins. The area is 3590 m2 .

F8480018 2 8480018 Retention Basin Concrete Storage Area-The Retention Basin Concrete Storage Area was a small land area used for the temporary storage of concrete removed from the basins until it could be loaded into containers for transport offsite. The area is 1059 M2 .

F8510001,2 3 8510001,2 Switch Yard- The Switch Yard contains the electrical switch yard for the facility. It consists of both paved and soil areas. The soil is 16700 m 2 and pavement is 14505 M2 .

F8570001 3 8570001 Subsurface Vaults- The Subsurface Vaults were the several concrete manholes and hand holes used for access to buried electrical cables located within the Industrial Area yard. The area is 2153 M 2 .

F8990071,2,3 1 8990071,2,3 CDS-Turbine Building Drains- The Turbine Building Drains were the buried and embedded drain pipes which conducted water from the Turbine Building into the clean oily water discharge piping. The areas are 11.1,22.8, and 180 m 2 respectively.

F8990291 3 8990291 Main Circ Water Pipe- The Circ Water Pipe consisted of 90" to 108" piping which transported water between the circ basin and the condenser bay. The area is 4515 m2.

F8990321 2 8990321 Nitrogen System Pipe- The Nitrogen System Pipe was 1" and 2" pipe which transported nitrogen under pressure across the site for use as a cover gas. The area is 24.7 M 2.

F8990351 3 8990351 Nuclear Service Water Pipe- The Nuclear Service Water Pipe provided cooling water to emergency and shutdown systems such as decay heat coolers and ventilation systems in two trains. The internal surface area is 35.4 m2.

F8990471 3 8990471 Service Water Pipe- The Service Water Pipe provided non-domestic water to the site from Folsom 2

South Canal. The area is 250.3 M2 .

F8990511 2 8990511 Carbon Dioxide System Pipe- The Carbon Dioxide Pipe transported CO 2 under pressure to rooms protected by the Cardox fire protection system. The internal surface areýi is 2.5 M 2.

F8990521 1 8990521 Acid Waste System Pipe- The Acid Waste Pipe 5

is that portion of the radwaste system that was designed to contain acidic waste from boric acid systems and the battery rooms. The area is 29.6 M 2 .

F8990054 3 8990054 CDS-Storm Drain Non-Discharge Pipe- The Storm Drain Pipe consists of piping that routed storm water from gutters and ditches to locations outside the Industrial Area without going through the normal effluent structure. The area is 4644 M 2 .

F8991073 3 8991073 CDS-Oily Water Separator- The Oily Water Separator pipe routed non-contaminated oily water from building drains.through the effluent structure. The area is 55 m'.

F8991091 8991091 RHUT Pipe Trench- The RHUT Pipe transported potentially contaminated water from the RHUT Tanks through the storm drains into the effluent structure. The area surveyed upon removal of the pipe was 1544 m2.

The locations of the survey areas listed in Table 1 above are shown in Fig. 1.

2.1.2 Survey Unit Information Being Provided in Subsequent Submittals As discussed previously, Rancho Seco anticipates at least two additional submittals of detailed information on dismantlement activities and final status survey results as these activities are completed. Below is a list of the remaining survey areas'to be surveyed and submitted The schedule and content of each submittal were developed based on a review of the remediation and FSS schedule, as well as in consideration of NRC review requirements. The remediation schedule is dynamic and subject to continued refinement in logic, durations, and completion dates.

It is Rancho Seco's intent to maintain the basic submittal schedule provided below. However, as a result of remediation schedule changes, it is possible additional submittals may be made with the goal of providing release records as soon as possible to the NRC to facilitate the agency's timely review.

Fourth & Fifth Submittal Scheduled for 7/7/08 & 10/16/08 (-65 Survey Units each)

F800001 Folsom Canal F800002 Helo Pad F800003 South Scrap Yard F800009 SE Industrial Area 1F8000142 North IA Pavement F800103 Turbine Building/NSEB Alley F8000101,2 Industrial Area Yard F800011 Central Corridor F808003 Cooling Tower Buffer Area F810001 Tank Farm Surface Soil 6

F810002 Tank Farm Subsurface Soil F81 1000 Reactor Building (-24 Survey Units)

F812000 Fuel Building (-17 Survey Units)

F813000 Auxiliary Building (-52 Survey Units)

F826000 Turbine Building (-16 Survey Units)

F826025 North Laydown Area F826026 South Laydown Area F834000 Rail Land F837000 RHUT, Aux Boiler Pad F848019 Miscellaneous Small Buildings F854000 POL Building F501005 Access Road F899011 Decay Heat System Pipe F899040 Reactor Drain System Pipe F899042 Radwaste System Pipe F899044 Fuel Pool System Pipe 2.2 Dismantlement Activities The Rancho Seco License Termination Plan describes the dismantlement activities to be performed for each area and applicable structure of the Rancho Seco site consistent with the use of the Building Occupant scenario. In general, the LTP indicates that temporary structures will be demolished and that permanent structures will be left standing following final survey. In addition, the ISFSI and IOSB structures will remain. During the period of time represented by this submittal, concrete remediation has taken place in the Auxiliary Building, Turbine Building, and Spent Fuel Building. Interior concrete removal continued in the Reactor Building.

3.0 Technical Evaluation 3.1 Potential for Cross-Contamination from Subsequent Activities Since decommissioning activities are being conducted onsite in parallel with final status survey and release decisions, measures must be taken to protect survey areas from contamination during and subsequent to the final status survey.

Rancho Seco LTP sections 3.3.5 and 5.2.4 describe contamination and access control measures and periodic routine monitoring practices to prevent and/or detect re-contamination of survey areas during or following FSS. These requirements are implemented, as appropriate, through established procedures as described in the LTP.

The potential for re-contamination and the contamination controls/monitoring for the specific survey areas included in this release phase are discussed and evaluated below:

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3.1.1 100000 Effluent Corridor The majority of the Effluent Corridor was determined to be Class 3 and did not require remediation. A small area was determined to exceed the DCGL and was remediated and resurveyed as a Class 1 area. There is little likelihood that the area will become recontaminated, however the area has been placed under periodic surveillance to ensure it remains in it's "as left" condition.

3.1.2 200000 South Outfall This area originally received storm water from the industrial area and was successfully surveyed as a Class 3 area. No remediation was required. Because the area drains historically uncontaminated or only slightly contaminated Industrial Area soils and radioactive material is no longer present, there is little likelihood that the soil will become contaminated in the future.

3.1.3 501000 Extended Parking Area The Extended Parking Area was successfully surveyed as a Class 3 area. No remediation was required. No radioactive material is allowed in the area and there is little likelihood that it will become contaminated in the future. The parking area has been placed under periodic surveillance to detect any potential re-contamination.

3.1.4 5010031, 2 Upper/Outer Yard & Hazardous Waste Building Pad The Hazardous Waste Storage Building foundation pad and the surrounding Upper/Outer Yard were successfully surveyed as a Class 3 structure and land area. No remediation was required. The foundation pad is all that remains of the structure and it sits in the

-middle of the paved area north of outside the industrial area. No radioactive material is, allowed in the area and there is little likelihood that it will become contaminated in the future. The paved area around the pad has been placed under periodic surveillance to detect any potential re-contamination.

3.1.5 800004 Central Transit Yard The Central Transit Yard was successfully surveyed as a Class 3 area. No remediation was required. No radioactive material is allowed in the area and there is little likelihood that it will become contaminated in the future. The area has been placed under periodic surveillance to detect any potential re-contamination.

3.1.6 800007 West Industrial Area The West Industrial Area was successfully surveyed as a Class 3 area. No remediation was required. No radioactive material is allowed in the area and there is little likelihood that it will become 8

contaminated in the future. The area has been placed under periodic surveillance to detect any potential re-contamination.

3.1.7 800012 Industrial Area Buffer Zone The Industrial Area Buffer Zone was successfully surveyed as a Class 3 area. No remediation was required. No radioactive material is allowed in the area and there is little likelihood that it will become contaminated in the future. The area has been placed under periodic surveillance to detect any potential re-contamination.

3.1.8 800014 North Industrial Area Soil The North Industrial Area Soil was successfully surveyed as a Class 3 area. No remediation was required. No radioactive material is allowed in the area and there is little likelihood that it will become contaminated in the future. The area has been placed under periodic surveillance to detect any potential re-contamination.

3.1.9 813000 Auxiliary Building (zones 1-12)

The rooms in zones 1-6 of the Auxiliary Building surveys are some of the most contaminated site areas. The survey units are all classified at least Class 2 for upper walls/ceilings with floors being at least Class 2 but usually Class 1. Most of the lower walls and floors required some concrete remediation. Because remediation is ongoing in adjacent areas, through-wall penetrations are covered, drain pipe openings are plugged, strict access controls are maintained and the areas are subject to periodic surveillance to check for potential re-contamination. Portions of zones 7-12 are Class 2 or 3 with little potential for re-contamination and the controls were somewhat less rigorous.

3.1.10 823000 Intake Structure The Intake Structure was successfully surveyed as a Class 3 structure. No remediation was necessary and there is little likelihood that the structure will become contaminated in the future. The structure has been placed under periodic surveillance to detect any potential re-contamination.

3.1.11 826000 LP Turbine Pedestal The LP Turbine Pedestal was successfully surveyed as a Class 3 area. No remediation was required. No radioactive material is allowed in the area and there is little likelihood that it will become contaminated in the future. The area has been placed under periodic surveillance to detect any potential re-contamination.

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3.1.12 832000 Diesel Fuel Oil Tank Pad Area The Diesel Fuel Oil Tank Pad was successfully surveyed as a Class 3 area. No remediation was required. No radioactive material is allowed in the area and there is little likelihood that it will become contaminated in the future. The area has been placed under periodic surveillance to detect any potential re-contamination.

3.1.13 839000 Transformer Yard The Transformer Yard was successfully surveyed as a Class 3 area.

No remediation was required. No radioactive material is allowed in the area and there is little likelihood that it will become contaminated in the future. The area has been placed under periodic surveillance to detect any potential re-contamination.

3.1.14 843000 Barrel Farm The Barrel Farm was an asphalt covered pad surrounded by an earthen berm used to store radwaste containers during plant operation. No remediation was required but the asphalt pad and soil berm were removed. There is little likelihood that the area will become contaminated in the future. The area has been placed under periodic surveillance to detect any potential re-contamination.

3.1.15 8480021 Retention Basin BufferZone The Retention Basin Buffer.Zone was the buffer between the remediated basins and the surrounding land. The area was successfully surveyed as a Class 3 area. No radioactive material is allowed in the area and there is little likelihood that'it will become contaminated in the future.

3.1.16 8480011,12 North and South Retention Basins The concrete retention basins held the liquid effluent from plant operation prior to its release overboard. The basins were remediated, all of the concrete was removed along with any contaminated soil. There is no likelihood that the structures will become contaminated in the future because all radioactive liquid releases have been terminated.

3.1.17 8480017 Retention Basin Surface Soil The Retention Basin Surface Soil is the clean material that was used to backfill the retention basins after demolition. There is little likelihood that the soil will become contaminated in the future because all radioactive releases have been terminated.

3.1.18 8480018 Retention Basin Concrete Storage Area 10

The Retention Basin Concrete Storage Area was the location used to temporarily store the concrete removed from the retention basins during demolition until it could be packaged and shipped. The area was successfully surveyed as a Class 2 area. No radioactive material is allowed in the area and there is little likelihood that the soil will become contaminated in the future.

3.1.19 851001,2 Switch Yard The electrical Switch Yard is still in operation. The soil and pavement was successfully surveyed as a Class 3 area. No remediation was required. Access to the area is controlled by operations personnel and there is little likelihood that the structure will become contaminated in the future. The area has been placed under periodic surveillance to detect any potential re-contamination.

3.1.20 857000 Subsurface Vaults The Subsurface Vaults were the concrete manholes and hand holes used for access to buried electrical cables. The only potential for contamination was from contaminated water in-leakage. The vaults were successfully surveyed as Class 3. Contaminated soil in the surrounding yard has been previously remediated. No radioactive material is allowed in the area and there is little likelihood that it will become contaminated in the future. The area around the vaults has been placed under periodic surveillance to detect any potential re-contamination.

3.1.21 899000 Buried or Embedded Piping Systems The pipe remaining on site is surveyed and grit blasted, if necessary, to remove surface contamination. Once final surveys are complete, the pipes are plugged to prevent recontamination or, if necessary, grouted in place. There is little likelihood that piping will become re-contaminated following final survey. In addition, the rooms containing access to the pipes are placed under periodic surveillance to detect any potential re-contamination once FSS is complete.

4 Final Status Survey Report Rancho Seco LTP section 5.7.3 identifies the contents of the written reports of final status survey results that are to be submitted to the NRC. The contents include the items described inNUREG-1757, Vol. 2, Section 4.5. The survey unit design details and results are provided below in summary fashion. Specific survey unit design details and results are provided in a copy of each survey unit summary report in Attachment I of this submittal.

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4.1 Overview of Results The following survey units are included in this report:

F 100001-4 Effluent Corridor F200001 South Outfall F5010031 Upper/Outer Yard Pavement F5010032 Hazardous Waste Building Foundation Pad F5010041,2 Extended Parking Area F800004 Central Transit Area F800007 West Industrial Area F800012 IA Waste Buffer F8000141 North Industrial Area F823000 Intake Structure F8261002 LP Turbine Pedestal F832000 Diesel Oil Tank Pad Area F839000 Transformer Yard F843001,2 Barrel Farm F8480017 Retention Basin Surface Soil F8480018 Retention Basin Concrete Storage Area F8480011,12 North and South Retention Basins F8480021 Retention Basin Buffer Zone F851001,2 Switch Yard Land F857000 Sub Surface Vaults F813000 Auxiliary Building (Rooms 3, 13, 14, 16, 17, 24, 26, 27, 104-135, 111, 112, 113, 114, 115, mezzanine roof, 206 and 207.)

F8990054 CDS-Storm Drains Offsite F899007 CDS-Turbine Building Drains F899029 Main Circ Water Pipe F899032 Nitrogen Pipe F899035 Nuclear Service Water Pipe F899047 Service Water Pipe F899051 Carbon Dioxide Pipe F899052 Acid Waste Pipe F8991073 CDS-Oily Water Separator F899109 RHUT Pipe Trench The summary report for each survey unit contains a description of the survey unit; design information, including classification, size, number of measurements, map, scan coverage, and DCGL; survey results; survey unit investigations (anomalous data); data assessment results, including statistical evaluations, if applicable; changes in initial survey unit assumptions on extent of residual activity, an evaluation of LTP changes subsequent to the FSS of the survey unit and survey unit conclusions.

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Overall, the attached survey unit summary reports demonstrate that the survey units meet the criteria for release for unrestricted use in accordance with the NRC approved Rancho Seco License Termination Plan.

4.2 Discussion of Changes to FSS Program The purpose of this section is to discuss changes to the FSS program. At the time of this submittal there have been no changes made to the FSS Program.

Procedures were revised to tighten contamination controls in FSS areas but there was no effect on the final surveys.

4.3 Final Status Survey Methodology This section summarizes the implementation of the LTP Final Status Survey methodology for the survey units that are included in this first report supporting the release of remaining non-ISFSI and non-IOSB land. A table is provided below that lists the key FSS design features for each survey unit. These design features include the survey unit classification and size, the standard deviation and Lower Boundary of the Gray Region (LBGR) used for determining the number of direct measurements taken, the percent scan coverage, the design DCGLEMc and the number of measurements required. This report covers only structures for which the DCGL is 43,000 dpm/100 cm2 (16,000 dpm/100 cm 2 for special areas) as well as pipe which has a DCGL of 100,000 dpm/!100 cm2 and soil or paved areas which have a DCGL of 52.6 pCi/g Cs-137sur and 12.6 pCi/g Co-60. The standard deviations listed were obtained from site characterization data or survey unit specific measurements. The Type 1 and 2 Errors are the default values of 0.05 and the LBGR is initially based on 50% of the DCGL.

Table 2 Survey Unit Design Parameters Survey Class Survey Standard LBGR Design Units Number of  % Scan Unit ID Unit Size Deviation DCGLEMc Measurements (m2)

F 1000001 Effluent Corridor 1 1 2 1 8339 14.7 1 27.8 N/A pCi/g 19 55 F 1000002 Effluent Corridor 2 1 2 17744 14.7 1 25.6 N/A pCi/g 17 23 F1000003 Effluent Corridor 3 1 2 1 5202 14.7 27.8 N/A pCi/g 21 23 F 1000004 Effluent Corridor 4 1 1 1 198 9.03 25.8 108 pCi/g 15 100 F2000001 South Outfall 1 1 3 1226567 1 0.15 25.6 N/A pCi/g 14 1 F5010031 Upper/Outer Yard Pavement 1 1 3 1 2665 1 0.034 25.6 N/A pCi/g 14 14.7 F5010032 Hazardous Waste Building"Pad 2 3 268 397 21500 N/A dpm/100 14 18 cm 2 F5010041 Extended Parking Area Soil 1 7 3 1 42735 1 0.058 51 N/A pCi/g 14 7.2 F5010042 Extended Parking Area Pavement 2 1 3 1 38692 1 0.058 1 25.6 N/A pCi/ 14 3.3 F8000041 Central Transit Area 13

Survey Class Survey Standard LBGR Design Units Number of  % Scan Unit ID Unit Size Deviation DCGLEMC Measurements (m2) 1 3 6634 0.01 25.6 N/A pCi/ 14 10 F8000071 West Industrial Area 1 3 1 88190 1 0.034 25.6 N/A pCi/g 14 6.4 F8000121 Industrial Area Buffer Zone 1 3 16114 0.01 2.5.6 N/A pCi/g 15 10 F8000141 North Industrial Area 1 3 1 55761 0.03 25:6 N/A pCi/g 14 9.8 F8130051 Aux Building Rm 3 Lower 11 141 9976 21500 156520 dpm/100 26 100 2

cm F8130061 Aux Building Rm 3 Upper 1 302 9976 21500 154800 dpm/100 2

44 100 cm F8130131 Aux Building Rm 13 1 1 68.2 12035 21500 207561. dpm/100 2

18 100 cm F8130141 Aux Building Rm 14 1 61.6 12035 21500 222282 dpm/100 16 100 cm 2 F8130181 Aux Building Rm 16 1 114 12035 21500 146200 dpm/100 21 100 cm 2 F8130191 Aux Building Rm 17 1 167 12035. 21500 141900 dpm/100 25 100 cm2 F8130321 Aux Building Rm 24 1 1 153 12035 21500 150500 dpm/100 29 100 cm2 F8130351 Aux Building Rm 26 1 1 182 12035 8050 99015 dpm/100 65 100 cm2 F8130361 Aux Building 1 Rm 283.927 12035 21500 142760 dpm/100 43 100 cm2 F8130881 Aux Building Rms 104-135 1 3 4926 6935 21500 N/A dpm/100 2

14 6 cm F8130991 Aux Building Rm 112 1 1 243 6935 21500 150500 dpm/100 42 100 cm2 F8131001 Aux Building Rm 111 1 2 83 6935 21500 N/A dpm/100 17 30 2

cm F8131011 Aux Building Rm 113 1 2 155 6935 21500 . N/A dpm/100 2

22 39 cm F8131021 Aux Building Rms 114, 136, 137 I 1 242.5 6935 21500 141900 dpm/100 46 100 F8131031 Aux Building Rms 115,203,315 1 2 199 6935 21500 N/A dpm/100 2

15 80 cm F8131311 Aux Building Mezzanine Roof 1 3 482 5461 21500 N/A dpm/100 14 10 cm 2 14

Survey Class Survey Standard LBGR Design Units Number of  % Scan Unit ID Unit Size Deviation DCGLEMc Measurements (m2)

F8131351 Aux Building Rm 206 1 3 294 5461 21500 N/A dpm/100 14 10 cm2 F8131361 Aux Building Rm 207 1 3 842 5461 21500 N/A dpm/100 2

14 10 cm F8230001 Intake Structure 1 3 402 667 21500 N/A dpm/100 14 5 cm 2 F8261002 LP Turbine Pedestal 2 3 996 3130 33610 N/A dpm/100 2

14 11 cm F8320001 Diesel Fuel Oil Tank Pad Area 1 3 1560 0.01 25.6 N/A pCi/g 14 9 F8390001 Transformer Yard 1 3 1 3385 0.432 25.6 N/A pCi/g 14 11.6 F8430011 Barrel Farm Soil 1 1 11313 1.46 25.6 64 pCi/g 16 100 F8430021 Barrel Farm Berm 1 2 1 5000 0.034 25.6 N/A pCi/g 15 33 F8480021 Retention Basin Buffer Zone 1 3 1 10845 0.047 25.6 N/A pCi/g 14 13.7 F848001 I North Retention Basin I I I .1 1432 0.49 25.6 64.6 pCi/g 29 100 F8480012 South Retention Basin 2 -1 1388 0.49 25.6 64.8 pCi/g 21 100 F8480017 Retention Basin Surface Soil 7 3 3590 [ 0.49 25.6 N/A pCi/g 14 11.7 F8480018 Retention Basin Concrete Storage Area 8 2 11059 0.49 25.6 N/A pCi/g 16 26.7 F85 10001 Switch Yard Soil 1, 3 116700 0.008 25.6 N/A pCi/g 14 5 F8510002 Switch Yard Pavement 2 . 3 114505 0.097 25.6 N/A pCi/g 14 3 F8570001 Subsurface Vaults 1 .3 2153 87 21500 N/A dpm/100 2

19 9 cm F8990071 CDS-Turbine Building Drains 1 1 11.1 23464 50000 100000 dpm/100 409 100 cm2 F8990072 CDS-Turbine Building Drains 2 1 22.8 23464 50000 100000 dpm/100 819 100 cm F8990073 CDS-Turbine Building Drains 3 1 180 23464 50000 100000 dpm/100 3997 100 cm F8990291 Main Circ Water Pipe 2

cm F8990321 Nitrogen Pipe 1 2 24.7 9677 50000 N/A dpm/100 109 11 cm 2 F899035 1 Nuclear Service Water Pipe 1 1 3 1 35.4 1 125 50000 N/A dpm/100 14 7 15

4.4 Final Status Survey Results The methods used to determine the number of direct measurements to be taken are described in the LTP and the specific survey unit summary reports provided in Attachment I. Key survey results are given in Table 3 below.

Table 3 Survey Unit FSS Results Scan No. Direct Mean Maximum Direct Units No.-Scan Measurement Meas. Direct Direct Standard Elevated Range Taken Result Result Deviation Areas F 1000001 Effluent Corridor 0.014-0.4638 19 0.047 0.399 0.103 unity 0 F1000002 Effluent Corridor 0.127-6.53 1 17 1 0.691 I 4.32 [ 1.43 pCi/g [ 0 F 1000003 Effluent Corridor 0.015-0.168 1 21 [ 0.032 I 0.439 [ 0.094 ] unity [ 0 F 1000004 Effluent Corridor 0.018-0.225 1 15 0.153 0.549 0.152 unity 0 F2000001 South Outfall MDA-0.342 1 14 0.272 0.531 0.159 pCi/g 0 F5010031 Upper/Outer Yard Pavement

<0.358 1 14 1 0.764 0.847 0.049 pCi/g 0 F5010032 Hazardous Waste Building Pad 4577-5655 1 14 1 2503 1 2666 102 dpm/100Icm2 0 F5010041 Extended Parking Area Soil

<0.371 1 14 10.093 0.251 0.054 pCi/g 0 F5010042 Extended Parking Area Pavement

<0.441 14 70.677 0.736 0.038 pCi/g 0 F8000041 Central Transit Area

<0.331 1 14 0.665 0.896 0.338 pCi/g 0 F8000071 West Industrial Area

<0.344 1 14 0.064 0.090 0.015 pCi/g 0 F8000121 Industrial Area Buffer Zone

<0.350 1 15 10.365 0.852 0.390 pCi/g 0 16

Scan No. Direct Mean Maximum Direct Units No. Scan Measurement Meas. Direct Direct Standard Elevated Range Taken Result Result Deviation Areas F8000141 North Industrial Area

<0.384 14 0.078 0.201 0.039 pCi/ 0 F8130051 Aux Building Rm 3 Lower 1922-189618 1 26 1 3560 27664 5084 dpm/100cm2c 6 F8130061 Aux Building Rm 3 Upper 767-51835 1 44 2076 4373 869 dpm/100cm2 2 F8130131 Aux Building Rm 13 3297-91179 I 18 I 2236 I 4596 I 729 I dpm/100cm2 I I F8130141 Aux Building Rm 14 1356-114477 16 W2719 11365 2486 dpm/100cmM2 5 F8130181 Aux BuildingRm 16 1532-81309 21 3867 23234 4907 dpm/100cm 0 F8130191 Aux Building Rm 17 1496-132853 1 25 2294 4762 723 dpm/100cm2 0 F813.0321 Aux Building Rm 24 3551-124491 1 29 2379 7812 1628 dpm/100cm 0 F8130351 Aux Building Rm 26 4705-68478 65 2422 6284 844 dpm/100 cm2 5 F8130361 Aux Building Rm 27 1996-57103 43 2045 6790 800 dpm/100 cm2 0 F8130881 Aux Building Rms 104-135 2029-6419 14 1629 1940 233 dpm/100 cm2 0 F8130991 Aux Building Rm 112 1228-4531 42 3008 8077 1006 dpm/100 cm2 2 F8131001 Aux Building Rm 111 2171-3213 17 1338 1494 91 dpm/100 cm2 0 F8131011 Aux Building Rm 113 4284-14576 1 22 \ 1766 2578 253 dpm/100 cm 0 F8131021 Aux Building Rms 114, 136, 137

<1033-81018 46 1777 8149 1216 dpm/100 cm 0 F8131031 Aux Building Rms 115,203,315 1810-5759 15 1267 1504 116 dpm/100 cm2 0 F8131311 Aux Building Mezzanine Roof 3595-5583 14 1556 1805 149 dpm/00 cm2 0 F8131351 Aux Building Rm 206 2758-6221 14 1620 1961 231 dpm/100 cm2 0 F8131361 Aux Building. Rm 207 2810-6668 14 1454 1795 140 dpm/100 cm 0 F8230001 Intake Structure 4013-6896 14 2284 2630 262 dpm/100 cm2 0 F8261002 LP Turbine Pedestal 1584-3545 14 1708 1940 160 dpm/100 cm2 0 F8320001 Diesel Fuel Oil Tank Pad Area

<0.283 14 0.050 0.063 0.006 pCi/g 0 F8390001 Transformer Yard

<0.339 14 0.285 0.875 0.362 pCi/g 0 F8430011 Barrel Farm Soil 17

Scan No. Direct Mean Maximum Direct Units No. Scan Measurement Meas. Direct Direct Standard Elevated Range Taken Result Result Deviation Areas

• <0.344 16 0.063 0.139 0.021 pCi/g 0 F8430021 Barrel Farm Berm MDA-0.584 15 0.057 0.077 0.088 pCi/g 0 F8480021 Retention Basin Buffer Zone

<0.328 14 0.062 0.146 0.025 pCi/g 0 F8480011 North Retention Basin 0.009-0.084 29 0.043 0.192 0.048 unity 0 F8480012 South Retention Basin 0.009-0.069 21 0.058 0.421 0.099 unity 0 F8480017 Retention Basin Surface Soil

<0.296 14 0.059 0.097 0.012 pCi/g 0 F8480018 Retention Basin Concrete Storage Area

<0.024 16 0.013 0.040 0.012 unity 0 F85 10001 Switch Yard Soil

<5.2 14 0.061 0.090 0.016 pCi/g 1 F8510002 Switch Yard Pavement

<0.382 14 0.820 0.877 0.028 pCi/g 0 F8570001 Subsurface Vaults 262-625 19 400 625 87 dpm/100 cm2 0 F8990071 CDS-Turbine Building Drains 838-20923 409 2901 20923 1139 dpm/100 cm2 0 F8990072 CDS-Turbine Building Drains 919-3891 819 1663 3891 385 dpm/100 cm2 0 F8990073 CDS-Turbine Building Drains 818-50087 3997 2236 50087 2445 dpm/100 cm2 0 F8990291 Main Circ Water Pipe

<216 4 171 216 31 dpm/100 cm 0 F8990321 Nitrogen Pipe 2384-4376 109 3444 4376 430 dpm/100 cm 0 F8990351 Nuclear Service Water Pipe 6101-10249 14 8258 10249 1345 dpm/100 cm2 0 F8990471 Service Water Pipe 1036-1580 71 1433 1580 93 dpm/100cm2 0 F8990511 Carbon Dioxide Pipe 1655-2275 40 1929 2275 164 dpm/100 cm2 0 F8990521 Acid Waste Pipe 1267-75621 918 3327 75621 5275 dpm/100 cm2 0 F8990054 CDS-Clean Drain Pipe 6516-9997 402 8211 9997 873 dpm/100 cm2 0 F8991073 CDS-Oily Water Separator 2625-2926 2 15 0.049 0.064 0.006 pCi/g 0 dpm/100 cm Pipe Survey F8991091 RHUT Pipe Trench

<0.006-0.111 1 53 0.008 0.062 0.008 unity 0 18

4.5 Survey Unit Conclusions Rancho Seco concludes that this information is sufficient for the NRC to make a determination equivalent to 10CFR50.82 (a)(1 1) regarding the survey units contained in this submittal. The surveys for these survey units and associated documentation demonstrate that these areas of the facility and site are suitable for release in accordance with the criteria for decommissioning in 10CFR20, subpart Eby meeting a site release criteria of 25 millirem TEDE per year over background for all dose pathways in accordance with the approved License Termination Plan.

As stated in section 4 of the Rancho Seco LTP, as long as the residual activity within a survey unit is less than the DCGL (i.e., the survey unit average activity is less than the DCGL and the EMC criterion has been met), the ALARA criterion has been achieved.

4.6 Revision 1 of Summary Report F8130541, Aux Building Room 40 As part of the corrective action for DQ#07-020, gamma surveys were made in room 40 once remediation was complete in the adjacent pump alley. The gamma survey indicated the presence 5 small elevated areas (less than 0.5 m 2 in total). In the interest of completeness, those areas were evaluated and added to Table 3-1 of the Summary Report for the survey unit. That revised report is included in Attachment 1 of this Report.

6.0 References Rancho Seco License Termination Plan, rev. 0, submitted 4/07.

DQ#07-020, "Elevated Activity in Areas Having Already Completed FSS".

19

Cl Attachment 1 Survey Unit Summary Reports 21