ML090830318

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Final Status Survey Report for October 27, 2008, Site Access Roadway, Survey Unit F5010051
ML090830318
Person / Time
Site: Rancho Seco
Issue date: 10/27/2008
From: Tallman D
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
Shared Package
ML090830613 List: ... further results
References
DPG 09-097, F5010051
Download: ML090830318 (22)
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Rancho Seco Final Status Survey Summary Report October 27, 2008 Site Access Roadway Survey Unit F5010051 Prepared By: Dan A. Tallman__ Date: October 27, 2008 FSS Engi eer Reviewed By:. __ _ Date: _t_______

Lead FSS Engineer Approved By: / I Date: / - -

Dismantlement S erintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F5010051, Site Access Roadway Survey Unit

Description:

Operating History: The area consisted of the plant access road in the north east quadrant of the site. Operating records and the HSA document the potential for a release of radioactivity in this survey area. The access road provided the route over which radioactive shipments were made. The roadway was also adjacent to areas used for staging outgoing and incoming radioactive material shipments.

Site Characterization: These paved areas were surveyed and found to have a maximum mean value of 2,522 dpm/100 cm 2 and a maximum of 3,251 dpm/100 cm 2 . Based on the classification procedure (DSIP-0020), the area was determined-to be a Class 3 area HSA Events: none 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 determined using a random-start, fixed grid (due to the survey unit's configuration and the logistics associated with selecting the measurement locations solely on a random basis) and 924 mi were scanned for approximately 10% coverage. Gamma Direct Soil measurements were collected at each direct measurement location and analyzed using the Canberra Genie 2000 software package. 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 F5010051

Table 1. Survey Unit Design Parameters Survey Design Parameter Value Comment Survey Area: F501 Site Access Rbadway Survey Unit: 0051 Open Land Area - Paved, Class: 3 LTP Table 5-4 SU Area (m2): 9210 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): 0.032 DTBD-06-001, Table 5-4C Type I Error: 0.05 Type II Error: 0.05 Nuclide: Cs137 Sample Area (m2): N/A Class 3 Total Area Scanned (M2 ): 924 Scan Coverage (%): 10% Class 3 Zi. : 1.645 1.645 Sign P: 0.99865 Calculated Relative Shift: 800 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 F5010051

Survey Results:

A total of 18 direct measurements were made in F5010051. The results including mean, median, standard deviation and range are shown in Table 2. All of the direct measurements were less than the DCGL. None of the scan measurements indicated areas of elevated activity with a scan range of 0.0108 pCi/g - 0.306 pCi/g Co60 and 0.149 pCi/g - 0.8 10 pCi/g Cs 137. Direct Gamma soil samples 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 Mean:

Median:

Cs137 MDA Cs137 Activity 8.08E-01 8.06E-01 Ij Uncertainty Standard Deviation: , 3.75E-02 .. ,

Range: 6.8 1E-01 to 8.5 1E-0 I F5010051 AOOO1GD 8.46E-01 < 8.46E-01 F5010051 A0002GD 8.36E-01 < 8.36E-01 F5010051 A0003GD 6.81E-01 < 6.81E-01 F5010051 A0004GD 7.97E-01 < 7.97E-01 F5010051 A0005GD 8.26E-01 < 8.26E-01 F5010051 A0006GD 8.02E-01 < 8.02E-01 F5010051 A0007GD 8.41E-01 < 8.41E-01 F5010051 A0008GD 7.98E-01 < 7.98E-01 F5010051 A0009GD 8.5 1E-0I < 8.5 1E-01 F5010051 AOO1OGD 8.04E-01 < 8.04E-01 F5010051 AOO11GD 8.24E-01 < 8.24E-01 F5010051 A0012GD 7.95E-01 < 7.95E-01 F5010051 A0013GD 8.04E-01I < 8.04E-01 F5010051 A0014GD 8.12E-01 < 8.12E-01' F5010051 A0015GD 8.01E-01 < 8.01E-01 F5010051 A0016GD 8.08E-01 < 8.08E-01 F5010051 A0017GD 7.81E-01 < 7.81E-01 F5010051 A0018GD 8.35E-01 < 8.35E-01 Page 4 of 7 FSS Summary Report F5010051

Survey Unit Data Assessment:

The survey design required 18 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 greater than the design standard deviation. However, both values (sample standard deviation of 0.038 and design standard deviation 0.032) both result in a relative shift much greater than three, so no additional samples were required.

Page 5 of 7 FSS Summary-Report F5010051

Table 3. Data Assessment Results Survey Results Parameter Value Comment Actual Direct Measurements (N): 18 Median (pCi/g): 8.06E-01 Mean (pCi/g): 8.08E-01 Standard Deviation (pCi/g): 3.75*E-02 Maximum (pCi/g): 8.5 1E-01 Sign Test Final N Value: 18 S+ Value: 18 Critical Value: 12 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: Investigate Both values (0.038 &

0.032) result in a relative shift much greater than three. No additional samples required.

Pass the Sign Test? Yes Reject the Null Hypothesis? Yes The survey unit passes all conditions? Yes Page 6 of 7 FSS Summary Report F5010051

Survey Unit Investigations and Results:

No investigations were required for either direct or scan measurements and no investigation results are reported.

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 and the EMC criterion has been met), 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 greater than the characterization data used for survey design. However, both values (sample standard deviation of 0.038 and design standard deviation 0.032) both result in a relative shift much greater than three, so no additional samples were required..

==

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. No investigations were required.

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

It is concluded that survey unit F5010051 meets the release criteria of 10CFR20.1402.

Page 7 of 7 FSS Summary Report F5010051

Attachment 1 Maps October 27, 2008 Survey Unit F5010051

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- ACCESS ROAD ISOCS Comma Scan measurements to be centered 3 feet from pavement edge on inside of turn radius (1owý side) at - 80 foot intervols.

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Attachment 2 Instrumentation October 27, 2008 Survey Unit F5010051

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

08051294 Asphalt - 0.851 pCi/g Cs-137 s NAsphalt - 0.877 pCi/g Co-60 ISOCS N/A 1983920 Asphalt - 0.350 pCi/g Cs-137 I NAsphalt - 0.247 pCi/g Co-60 Table 2-2. Investigation Criteria and DCGL Instrument Parameter Value Investigation Criteria - Asphalt - 25.6 pCi/g Cs- 137(sUIT.)

Inspector Direct Asphalt - ND pCi/g Co-60 Investigation Criteria - Asphalt - 20 pCi/g Cs-137 Scan Asphalt - 5 pCi/g Co-60 All DCGLw 51.2 Cs-137 12.6 Co-60 All DCGLEMC N/A Page 2 of 2 Att. 2 Instrumentation F5010051

Attachment 3 Investigation October 27, 2008 Survey Unit F501-0051 (none required)

Attachment 4 Data Assessment October 27, 2008 Survey Unit F5010051

-e 0QF5010051 Quantile Plot Cs137 DCGL 51.2 pCi/g 0.900 "

0.800 ---------

  • 0.806 0.600

> .0000 S0.40 a~,0.0 0.200 0.100 '-

0.000 d 0 20 40 60 80 100 Percentile I Activity - Median - - - 75th Percentile. - - - - 50th Percentile I

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F5010051 Scatter Plot Cs137 DCGL = 51.2 pClIg 1.00 E+00 0 92 B.OOE-01 0 0~~~

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8.OOE-01 0 0.806 L~7.0012-01 0.696 CL 6.OOE411 5.00 E-011 Z 4.00 E-01 S3.0012-01 2.GOE-01 CD, 1.012-01 a.OQE+0o I I .

t f t I I ý I I . ý ý I I - , II JI Measurement Locations 1 o Actdty - Average - - "+3StDev - - "-3SlDev"I

F5010051 Frequency Plot Cs1 37 DCGL = 51.2 pCi/g 10 9

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0N N N N 0N Bins - Upper End Value (pCi/g)

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