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 SU Area (m 2):

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 Maps February 26, 2009 Survey Unit F8000142

(}rQ6813127E 1890003N 6814124E F800014-3 O

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SAMPLE PI 01SB 02SB 03SB 04SB 05SB 06SB 07SB 08S8 093B 1os8 11SB 12SB 13SB 14SQ 15SB 16SB 17SB 18SB 19SB 20SB EASTING 6813125E 681331 4E 681321 BE 6813135E 6813314E 6813593E 6813782E 6813686E 6813603E 6813782E 6813151E 6813580E 6814092E 6814106E 6814042E 6813886E 6813883E 6813606E 6814003N 6814221E NORTHING 1889830N 1889829N 1889613N 1889426N 1889426N 1889830N 1889829N 1889613N 1889426N 1889426N 1889972N 1889963N 1889931N 1889629N 1889271N 1889292N 1888968N 1888765N 1888833N 1888883N 07ri 00 i*Lun SACRAMENTO MUNICIPAL UTILITY DISTRICT NORTH INDUSTRIAL AREA PAVED SURFACES SCAN BACKGROUND LOCATIONS F80001 42-M8 10 20 SCALE METERS FILE: 800014 RC RAYMOND I.

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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
  1. 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

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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 Investigation February 26, 2009 Survey Unit F8000142

Table 3-1 Survey Unit Investigation Investigation Initial Investigation Elevated Area Investigation DCGLtmc Grd Lvl(p)

Value R

~)I Area Fatr DCGLemc Reut((Unity 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 Data Assessment February 26, 2009 Survey Unit F8000142

(D~

0 ý 00 F8000142 Quantile Plot Cs137 DCGL = 51.2 pCi/g 0.

.5 4-C.,

0.820 0.800 0.780 0.760 0.740 0.720 0.700-0.680 0.660 0.736 0

20 40 60 Percentile 80 100 I #

Activity -

Median -

- -75th Percentile -

- 50th Percentile

F8000142 Scatter Plot CS137 DCGL = 51.2 pClIg 1,0012+00 9.50E-01 9.002-01 7 8.50E-01 o

a___*so a a a a a

a-a-

a

.82 8.00E-01 0D 6.50 -01

.75 5.0 0 2 -0 1 0.......

. t, I '

1, 6.002-01 5.00E-01 00 Measurement Locations 2Zo Activiy a "+3StDev" a-

-3StDev"!

o Atvt

0 Ci2 00 F8000142 Frequency Plot Cs1 37 DCGL = 51.2 pCi/g 9

8 0C 7 6

.2 4 3

12 0

1-N

'71-

'V N

0ý Bins - Upper End Value (pCi/g)

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