ML090830545

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Final Status Survey Report for February 26, 2009, Northern IA Paved Surfaces, Survey Unit F8000142
ML090830545
Person / Time
Site: Rancho Seco
Issue date: 02/26/2009
From: Tallman D
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
Shared Package
ML090830613 List: ... further results
References
DPG 09-097, F8000142
Download: ML090830545 (24)
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.i Rancho Seco Final Status Survey Summary Report February 26, 2009 Northern IA Paved surfaces Survey Unit F8000142 Prepared By: Dan A. Tallman & DDate: February 26, 2009 FSS Engineer Reviewed By:*' ate: I ?- to-/

Lead FSS Engineer Approved By: Date: ______

Dismantlement Superintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8000142, Northern IA Paved surfaces Survey Unit

Description:

Operating History: This survey unit is a composite of areas identified during characterization as 800013, 800014, 803001, & 806000. These areas were the Central IA, Northern IA, east and west spray ponds, and the Quonset hut pad.

The survey unit consists of the paved portions of the land area that extends from the northern industrial area security fence south to the pavement surrounding the cooling towers in the south and from the eastern IA security fence at the sally port to approximately 100 feet west of the west spray pond. (See attached map)

These paved surfaces and roadways were used to support the transportation, staging, and (in the case of the Q-HUT pad) processing of licensed radioactive material. The HSA has multiple records indication the potential for minimal residual contamination.

Site Characterization: Soil and sediment samples were collected and analyzed for the presence of plant-derived radionuclides. Cs-137 was the only detected nuclide of plant origin with a mean activity level of 0.062 pCi/g and a maximum value of 0.299 pCi/g.

(Site background levels of Cs- 137 have been determined to be approximately 0.312 pCi/g.) As described in section 2 of the LTP, the area was evaluated using DSIP-0020 and was designated as Class 3.

Survey Unit Design Information:

The Survey Unit Design Parameters are presented in Table 1 below. The survey unit and measurement locations are depicted on the maps in Attachment 1. Direct measurement locations were randomly determined and 2916 m2 were scanned for approximately 10%

coverage. Gamma Energy Spectrum were collected at each direct measurement location and analyzed by Genie 2000 Gamma Spectral Analysis System. The instrumentation used for the survey along with the MDC values are listed in Tables 2-1 and 2-2 in Attachment 2.

Page 2 of 7 FSS Summary Report F8000142

Table 1. Survey Unit Design Parameters Survey Design Parameter Value Comment Survey Area: F800 Northern IA Paved surfaces Survey Unit: 0142 Open Land Area Class: 3 LTP Table 5-4 2 ):

SU Area (m 29138 Evaluator: D.A.Tallman DCGL Cs137 surrogate (pCi/g): 51.2 Area Factor: N/A Class 3 Design DCGLemc (pci/g): N/A Class 3 LBGR (pCi/g): 25.6 Default = 50% DCGL Design Sigma (pCi/g): 0.073 DTBD-06-001, Table 5-4D Type I Error: 0.05 Type II Error: 0.05 Nuclide: Cs137 Sample Area (m2): N/A Class 3 Total Area Scanned (m2): 2916 Scan Coverage (%): 10% Class 3 1.645 ZI.0 :1.645 Sign P: 0.99865 Calculated Relative Shift: 350.6 Relative Shift Used: 3 Uses 3.0 if Rel Shift >3 N-Value: 11 Design N-Value + 20%: 14 NUREG-1575 Table 5-5 Grid Spacing L: N/A Class 3 Page 3 of 7 FSS Summary Report F8000142

Survey Results:

A total of 14 direct measurements were made in F8000142. The results including mean, median, standard deviation and range are shown in Table 2. All of the direct measurements were less than the DCGL. Eight (8) of the scan measurements indicated areas of elevated activity which were evaluated. The scan range for the survey was 6685 cpm to 15674 cpm with the 44-10 NaI detector. Direct Gamma Spec measurements were counted to the MDC shown in Table 2-1 of Attachment 2.

Table 2. Direct Measurement Results (all activity values in pCi/g)

Measurement ID Cs137 MDA Cs137 Activity Uncertainty Median:~~ 7.36E-0 1

Standard Deviation: 2.77E-02 Range: 6.85E-01 to 7.96E-01 F8000142A0002GD 7.22E-01 < 7.22E-01 F8000142A0003GD 7.43E-01 < 7.43E-01 F8000142A0004GD 7.20E-01 < 7.20E-01 F8000142A0006GD 6.85E-01 < 6.85E-01 F8000142A0007GD 7.28E-01 < 7.28E-01 F8000142A0009GD 7.28E-01 < 7.28E-01 F8000142AOOI1GD 7.41E-01 < 7.41E-01 F8000142A0016GD 7.17E-01 < 7.17E-01 F8000142A0017GD 7.96E-01 < 7.96E-01 F8000142A0020GD 7.35E-01 < 7.35E-01 F8000142A0021GD 7.85E-01 < 7.85E-01 F8000142A0024GD 7.55E-01 < 7.55E-01 F8000142A0025GD 7.36E-01 < 7.36E-01 F8000142A0028GD 7.45E-01 < 7.45E-01 Page 4 of 7 FSS Summary Report F8000142

Survey Unit Data Assessment:

The survey design required 14 direct measurements for the Sign Test. The critical value and the results of the Sign Test are presented in Table 3. The sample mean and median values were less than the DCGL. The sample standard deviation was less than the design standard deviation so no additional samples were required.

Page 5 of 7 FSS Summary Report F8000142

Table 3. Data Assessment Results Survey Results Parameter Value Comment Actual Direct Measurements (N): 14 Median (pCi/g): 7.36E-01 Mean (pCi/g): 7.38E-01 Standard Deviation (pCi/g): 2.77E-02 Maximum (pCi/g): 7.96E-01 Sign Test Final N Value: 14 S+ Value: 14 Critical Value: 10 Sufficient Samples Collected: Yes Maximum Value < DCGL: Yes Median Value < DCGL: Yes Mean Value < DCGL: Yes Maximum Value < DCGLemc: N/A Class 3 Standard Deviation <= Sigma: Yes Pass the Sign Test? Yes Reject the Null Hypothesis? Yes The survey unit passes all conditions? Yes Page 6 of 7 FSS Summary Report F8000142

Survey Unit Investigations and Results:

Eight (8) investigations (scan grids AO 112, C041, C042, C047, C062, C140, C 145, &

C 151) were required. The results are reported in Attachment 3.

ALARA Statement:

As stated in Chapter 4 of the LTP, as long as the residual activity within the survey unit is less than the DCGL (i.e. the survey unit average activity is less than the DCGL), the ALARA criterion has been met.

Changes in Initial Survey Unit Assumptions:

The survey unit was designed as a Class 3 land survey and the sample results are consistent with that classification. The variability of the survey results was less than the characterization data used for survey design. Potential areas of elevated activity were detected and evaluated as shown in Attachment 3).

==

Conclusion:==

The FSS of this survey unit was properly designed as a Class 3 survey based on Table 5-4 of the LTP. The required number of direct measurements was made and the scan coverage met the requirement of Table 5-6 of the LTP. All of the direct measurements were less than the DCGL. Eight investigations were required.

The direct measurement data support rejection of the null hypothesis, providing high confidence that the survey unit satisfied the release criteria and that the data quality objectives were met.

It is concluded that survey unit F8000142 meets the release criteria of 10CFR20.1402.

Page 7 of 7 FSS Summary Report F8000142

Attachment 1 Maps February 26, 2009 Survey Unit F8000142

(}rQ6813127E 1890003N 6814124E F800014-3 O *F800014-4 681284E 0 ~1189778N 6812984E F800014-2 0 I /

6812984-1 681 12010E 681 681E 681380 F800 0014 15 80141-890N 8198N6125 F800014-16 F0 SCALE UILITY14STR5C o ,*.*..NORTH INDUSTRIAL AREA o *o,_. - NI!;

1072N I SACRAMENTO "PAVED MUNICIPAL SURFACES BOUINDIARIES F 4 I*METERSF -78 0 4-800014 iiMETERS DWG: 8000 14

(D 0

SAMPLE PI EASTING NORTHING 01SB 6813125E 1889830N 02SB 681331 4E 1889829N 03SB 681321 BE 1889613N 04SB 6813135E 1889426N 05SB 6813314E 1889426N 06SB 6813593E 1889830N 07SB 6813782E 1889829N 08S8 6813686E 1889613N 093B 6813603E 1889426N 1os8 6813782E 1889426N 11SB 6813151E 1889972N 12SB 6813580E 1889963N 13SB 6814092E 1889931N 14SQ 6814106E 1889629N 15SB 6814042E 1889271N 16SB 6813886E 1889292N 17SB 6813883E 1888968N 18SB 6813606E 1888765N 19SB 6814003N 1888833N 20SB 6814221E 1888883N 07ri 00 NORTH INDUSTRIAL AREA PAVED SURFACES i*Lun SACRAMENTO MUNICIPAL SCAN BACKGROUND LOCATIONS 1020 SCALE UTILITY DISTRICT F80001 42-M8 METERS FILE: 800014 RC RAYMOND I.

(.D d30 0 SAMPLE Pt EASTIN N TIQhN~

FIELD IDENTIFICATION DATA

  1. 01 6813662E 1889557N
  1. 04 6814070E 1888827N
  1. o6 681317DE 188941414
  1. 07 681357DE 1889466N
  1. 08 6813633E 1889498N4
  1. 09 6813132E 1889966N
  1. 10 6813799E 1889799N
  1. 11 6813574E 1889471N

> #12 6813091E IB956ON

  1. 13 68131746 1889477N4
  1. 14 6813420E 1889962N
  1. 15 6813174E 1889810N
  1. 16 6813737E 1889696N
  1. 17 6813726E 188964314
  1. 18 6813216E 1889696N
  1. 19 6814028E 1888824N
  1. 20 6813331E 1889974N
  1. 21 6813793E 1889884N
  1. 22 6813664E 1889664N
  1. 25 6813882E 1889018N
  1. 26 6813956E 1888820N
  1. 27 6813768E 1888221N
  1. 28 68132786 188963314
  1. 29 68137266 188996314
  1. 30 6813340E 1889706N
  1. 31 681331DE 1889696N
  1. 36 6813301E 1889695N

'.i.#38 6813611E 1889715N NORTH INDUSTRIAL AREA o PAVED SURFACES W BETA DIRECT MEASUREMENT LOCATIONS

-I.10*2*

SCALE SACRAMENTO MUNICIPAL UTILITY DISTRICT F80 0 0142 -. M.I ,^

METERS FILE: B00014 RC RAYMOND

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0 00 NORTH INDUSTRIAL AREA PAVED SURFACES 0 CONCRETE SCAN LOCATION DESIGNATION SACRAMENTO MUNICIPAL GAMMA SCAN MEASUREMENT LOCATIONS 0 5 10. 15 SCALE ASPHALT SCAN LOCATION DESIGNATION UTILITY DISTRICT F8000 t42 -M-2 RC RAYMOND METERS FILE: 800014

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.cOG1 C04 1 C 0.0 C C C Ci1~042 19 SPA0MA-SCAN51.015MATCH LINE CONT ON SCL F80001 42-M2 METERS 7 00 5 0' 5 NORTH INDUJSTRIAL AREA SCALE S ~~~CONCRETE SCANLOCATION DESIGNAT16N PVDSRAE MEERDs u GAMMA SCAN MEASUREMENT LOCATIONS I'* (15k) ASPHALT SCAN LOCATIONDESIGNATION UTILITY DISTRICT SACRAMENTO MUNICIPAL ....... 80 0 F80001 442- -- M3M3 F'ILE: 600014*, RC RAYMONDI

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-1 CONCRETE SCAN LOCATIONDESIGNATION NORTH INDUSTRIAL AREA 00

(ý) ASPHALT SCAN LOCATION DESIGNATION PAVED SURFACES

  • .SMUn SACRAMENTO MUNICIPAL GAMMA SCAN MEASUREMENT LOCATIONS F80001 42-M4 UTILITY DISTRICT FILE: 600014 RC RAY:MOND

MATCH LINE CONT F5000142-M4 I~~ SPSU0-4 ETE-094 O*** -* - * - 1-Y -) I* - " / --_ EE SQUAREs 000 00 5 1 - i _L L 0C69 0 S 03 0'0.

4" 0 SCALE METERS 00 CONCRETE SCAN LOCATIONDESIGNATIONNO T I DU R AL RE

//*\" *PAVED SURFACES SASPHALT SCAN LOCATIONDESIGNATION MU G AI*MM SCAN MEASUREMENT LOCATIONS

-SACRAMENTO t'J MUNICIPAL UTILI4154 ISMR0C F 80 00 1 42 - M5 FILE: 800014 RC RAYMOND

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0 5 10 SCALE METERS 00 NORTH INDUSTRIAL AREA PAVED SURFACES CONCRETE SCAN LOCATIONDESIGNATION SAMMA SCAN MEASURMENT LOCATIONS SACRAMEN-o MUNICIPAL ASPHALTSCAN LOCATIONDESIGNATION UTILITY DISTRICT F80001 42-M6 FILE: 800014 RC RAYMOND

Attachment 2 Instrumentation February 26, 2009 Survey Unit F8000142

Table 2-1. Survey Unit Instrumentation Detector Detector Serial Instrument Model No. MDC No.

2350-1 43-68b 148460/161410 1033 dpm/100 cm2 2350-1 44-10 171374/211672 8.02 pCi/g' Inspector N/A 08051294 Asphalt - 0.702 pCi/g Co-60 Asphalt - 0.796 pCi/g Cs-137 1"FSS Scan Survey of Pavement (asphalt) and Concrete Using the 44-10 and SPA-3 Nal Detectors" 8/30/06 RFD.

Asphalt and Soil Volumetric, 2.0 g/cc option Table 2-2. Investigation Criteria and DCGL Instrument Parameter Value 2350/43-68 Investigation Criteria - Scan 4,000 cpm 2350/44-10 Investigation Criteria - Scan 6,100 cpm InSpector Investigation Criteria - Direct Asphalt - 25.6 pCi/g Cs-137 (sur.)

All DCGLw 51.2 Cs-137 12.6 Co-60 All DCGLEMC NA-Class III cpm above regional background.

Page 2 of 2 Att. 2 Instrumentation F8000142

Attachment 3 Investigation February 26, 2009 Survey Unit F8000142

Table 3-1 Survey Unit Investigation GrdInvestigation Lvl(p) Value Initial RInvestigation

~)I Elevated Area Area Fatr DCGLemc Investigation Reut((Unity DCGLtmc Level (cpm) (cpm) Result (pCi/g) (m2) jFactor Result_(pi_ _ Fraction A0112GS 10,972 15,647 [ 0.661/1< 0.735 NA NA NA <DCGLw NA C0041GS 8,173 8,221 _< 0.725/< 0.806 NA NA NA <DCGLw NA C0042GS 8,173 8,381 _< 0.698/_< 0.787 NA NA NA <DCGLw NA C0047GS 8,173 8,472 _< 0.760/_< 0.790 - NA NA NA <DCGLw NA C0062GS 9,243 9,422 _<S0.790/_< 0.782 NA I NA NA <DCGLw NA COI40GS 9,356 9,356 < 0.687/ <0.802 NA NA NA <DCGLw NA C0145GS 9,115 9,115 < 0.780/_< 0.811 NA NA NA <DCGLw NA C0151GS 9,625 9,625 < 0.822/_< 0.858 NA NA NA <DCGLw' NA Survey Unit Remainder DCGL= SU Mean= NA 51.2 1 Co60/Cs137 respectively EMC Unity Sum NA Page 2 of 2 Att. 3 Investigation F8000142

Attachment 4 Data Assessment February 26, 2009 Survey Unit F8000142

F8000142 Quantile Plot Cs137 DCGL = 51.2 pCi/g 0.820 0.800 (D~

0.780 0ý 0.760 0.

0.740 0.736

.5 4-C.,

0.720 0.700-0.680 0.660 0 20 40 60 80 100 Percentile 00 I # Activity - Median - - -75th Percentile - - - - 50th Percentile

'* F8000142 Scatter Plot CS137 DCGL = 51.2 pClIg 1,0012+00 9.50E-01 9.002-01 78.50E-01 o a___*so - - a a a a - - a- - a-a- a - .82

> 8.00E-01 0D 6 .50 -01 - .75 5 .00 2-0 1 . . . t, 0....... . ......

I ' 1, ....... , ....... .. .

6.002-01 5.00E-01 00 Measurement Locations 2Zo o Activiy Atvt a "+3StDev" a- -3StDev"!

F8000142 Frequency Plot 0

Cs1 37 DCGL = 51.2 pCi/g 9

8 0C 7 6

.2 4 Ci2 3

- 12 0

1-N N

'V 0ý

'71-00 Bins - Upper End Value (pCi/g)

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