ML090830544

Final Status Survey Report for February 22, 2009, Central Industrial Area Paved Roadways, Survey Unit F8000106

ML090830544
Person / Time
Site:	Rancho Seco
Issue date:	02/23/2009
From:	Sacramento Municipal Utility District (SMUD)
To:	NRC/FSME
Shared Package
ML090830613	List: ML090830313 ML090830314 ML090830316 ML090830318 ML090830319 ML090830320 ML090830321 ML090830322 ML090830323 ML090830324 ML090830541 ML090830542 ML090830543 ML090830544 ML090830545 ML090830546 ML090830547 ML090830548 ML090830573 ML090850549 ML090850550 ML090850551 ML090850552 ML090850553 ML090850554 ML090850555 ML090850556 ML090850557 ML090850558 ML090850559 ML090850560 ML090850561 ML090850562 ML090890534 ML090890535 ML090890536 ML090890537 ML090890539 ML090890584 ML090890585 ML090890586 ML090890587 ML090890588 ML090890727 ML090900729 ML090900730 ML090900731 ML090900732 ML090900733 ML090900770 ... further results
References
DPG 09-097, F8000106
Download: ML090830544 (22)

Text

Rancho Seco Final Status Survey Summary Report February 22, 2009 Central Industrial Area Paved Roadways Survey Unit F8000106 Prepared By: Date: -/ý.bs/zzo9 FSS Engineer Reviewed By: O- I J . X Date: '7-\. O0 Lead FSS Engineer Approved By: &- Date: 2-7 7-0co Dismantlement Sul rintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8000106, Central Industrial Area Paved Roadways Survey Unit

Description:

Operating History: Paved areas within the Industrial Area included the access road, parking lots, foundation pads from demolished temporary structures, and on-site transportation corridors used to transport materials across the site, including radioactive material. Both operational surveys and the HSA document contaminated asphalt and concrete within the IA and potential contamination events outside the IA.

Site Characterization: Paved areas were surveyed using gas flow proportional detectors with more than 300 direct measurements taken. Mean levels of contamination reported were 2,630 dpm/100 cm 2 with a maximum value of 5,262 dpm/100 cm 2 . Additionally, the access roads were gamma scanned using a multiple detector array with the east road showing <0.17 pCi/g Cs-137 and the west road showing <0.23 pCi/g Cs-137. Based on classification procedure (DSIP-0020) and the levels of activity found on asphalt and concrete surfaces, the general paved areas of the site were classified as Class 3. The classification for this survey area was increased from Class 3 to Class 2 not based on viable characterization data but as a conservative measure as the survey unit bounds a Class 1 land area.

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, fixedgrid pattern and 782 m2 were scanned for approximately 21% coverage. ISOCS gamma measurements were collected at each direct measurement location. 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 F8000106

Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F800 Central Industrial Area Paved Roadways Survey Unit: 0106 Open Land Area Class: 2 LTP Table 5-4 SU Area (m2): 3,680 Evaluator: D. Anderson DCGL Cs-137 surrogate 51.2 (pCi/g):

Area Factor: N/A Class 2 Design DCGLemc (pci/g): N/A Class 2 LBGR (pCi/g): 39.5 Adjusted Design Sigma (pCi/g): 3.90 DTBD-06-001, Table 5-4C Type I Error: 0.05 Type II Error: 0.05 Nuclide: Cs-137 Sample Area (m2): 263 Class 2 Total Area Scanned (m2): 782 Scan Coverage (%): 21.3% Class 2 1.645 Zi-p: 1.645 Sign P: 0.99865 Calculated Relative Shift: 3.0 Relative Shift Used: 3.0 Uses 3.0 if Rel Shift >3 N-Value: 11 Design N-Value + 20%: 14 NUREG-1575 Table 5-5 Grid Spacing L: 16.2 Class 2 Page 3 of 7 FSS Summary Report F8000106

Survey Results:

A total of 14 direct measurements were made in F8000106. 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' ISOCS gamma scan measurements on the asphalt roadway surfaces indicated areas of elevated activity. Co-60 was not identified above the MDC. The highest scan activity was 7.74E-01 pCi/g Cs-137.

Table 2. Direct Measurement Results (all activity values in pCig)

Measurement ID Cs137 MDA Csi37 Activity Uncertainty Mean: 2.90E-0 1 Median: 2.90E-0 1 Standard Deviation: A 1.39E-02 Range: 2.67E-ý01 to 3.13E-01 F8000106AOOO1GD 2.95E-01 < 2.95E-01 F8000106AO002GD 2.84E-01 < 2.84E-01 F8000106AO003GD 3.08E-01 < 3.08E-01 F8000106AO004GD 2.67E-01 < 2.67E-01 F8000106AO005GD 2.90E-01 < 2.90E-01 F8000106AO006GD 2.92E-01 < 2.92E-01 F8000106AO007GD 2.98E-01 < 2.98E-01 F8000106AO008GD 2.73E-01 < 2.73E-01 F8000106AO009GD 2:84E-01 < 2.84E-01 FS000106AOOIOGD 2.82E-01 < 2.82E-01 F8000106AOI11GD 2.73E-01 < 2.73E-01 F8000106AO012GD 2.90E-01 < 2.90E-01 F8000106AO013GD 3.08E-0I < 3.08E-01 F8000106A0014GD 3.13E-01 < 3.13E-01 Page 4 of 7 FSS Summary Report F8000106

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 F8000106

Table 3. Data Assessment Results Survey Results Parameter Value Comment Actual Direct Measurements (N): 14 Median (pCi/g): 2.90E-01 Mean (pCi/g): 2.90E-01 Direct Measurement Std Deviation (pCi/g): 1.39,E-02 Maximum (pCi/g): 3.13E-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 2 Standard Deviation <= Sigma: Yes Pass the Sign Test? Yes Reject the Null Hypothesis? Yes Does the Survey Unit Pass All Criteria? Yes Page 6 of 7 FSS Summary Report F8000106

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 2 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. No potential areas of elevated activity were detected.

==

Conclusion:==

The FSS of this survey unit was properly designed as a Class 2 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 Unity. No 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 F8000106 meets the release criteria of 10CFR20.1402.

Page 7 of 7 FSS Summary Report F8000106

Attachment 1 Maps February 22, 2009 Survey Unit F80001,06

-- *." - .- PRAY PONDS L.

o..-' I---E---El HUT 00

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- -l oo~~~~ t INDUSTRIAL [' 1 ,

ARFA FENCE-~- 51II -HAZARD MATERIAL 5 I 'i/AREHOUUK 1 S. BUILDN/_ G_ L0 I.. I . . .... .. .. - ... .. .5i '

// /* U I~ SLDIi ) V. HLORINE BUILDIN,

/ "WATER TREATMENT PL.NT

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AERA.TO N F'O!*C,--  ; i. . .. . - .. LIR N!....

LERS-.,* /~ TAAETK ,FARMIT*-" .. ......... B L-ERE EIVIIN WAREHOUSE AEATO "' -- _ - RFl S RAl \ >- TURBINE BUJILDING

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u "** -- '.*/ )* ' " *'-'t*-'*'T-'*'-*-] Z'*---'-*-7 ........ " \,F-ABRICATION SHOP . / \

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00'.5 AREA FENCE 2 - Industrial Area Boundary' Map F8000106-1, Central Industrial Area Paved Roadway E Location of surve unit Survey Unit Area: 3,680 sq. meters

............................ Class 2 Area

('D 0

00 CIO)

Warehouse B Turbine Building N 25 ft. T&R 00 Building OC 0 5 10 15 20 Map F8000106-2, Central Industrial Area Paved Roadway Distance in Meters Survey Unit Dimensions

Map F8000106-3, Central Industrial Area Paved Roadway Random Start Location

- 1. _ILj1rl

-L~

00 t --

- T- h 4-4V ON4 _LTi4-T

Map F8000106-4, Central Industrial Area Paved Roadway Direct Measurement Locations F8000106A0001GD to F8000106A0014GD 12.56 sq. meter field of view 0

00 Laydown 3 3 (DO(

Start Location: /

11 m north of survey unit boundary 14 m west of North Laydown area 16 m by 16 m grid Turbine Building Distance in meters N OI 00 C)

Maintenance south of corner I

C) Shop Distance in Meters oý

Map F8000106-5, Central Industrial Area Paved Roadway Scan Measurement Locations F8000106AOOO1GS to F8000106AOO13GS (D* 12.56 sq. meter field of view C

Total Scan Area: 163 sq. meters 00 Warehouse B North Laydown 13GS H iH iiH M H!1R1444 HH* 1 Ii iH , =HNHHi I H l=Hill,,, ,t! H, i tJJ!!i it! HH JH HI=

H HINHNH IH =,H lH=i HHH HOI ,HH I' ........

H H ,J 12GS m 11GS ...... 12 m lOGS....... 16m 9GS ........ 20 m 2 mfrom

.. ~~~~~~~~~...G ""*2fr!~l east edge "*"-- . .

8GS 28 m of road 7GS 6GS

.. ..... ... 32m 36m m Turbine Building 0 *Distance 5GS 44 m in meters

" ,.*I *south of 4GS 48 m corner 3GS .... 52 m C) 2GS 60m C) Maintenance ____

Shop 1GS *'* 64m m Distance5in Me 10 1 m from

Map F8000106-6, Central Industrial Area Paved Roadway Scan Measurement Locations F8000106AD014GS to F8000106AO040GS 12.56 sq. meter field of view 0

Total Scan Area: 339 sq. meters 00 rý kK: isý r ~.C? W q) O OPq)cr (n) (1)C

......O ....

0D 602 -4 02 W. N NO -

OD 0) F) .9 0) CO 0 N 3 3 3 3 2 2 3 Turbine Building N

00 Maintenance ON Shop i st 10 Distance in Meters

Map F8000106-7, Central Industrial Area Paved Roadway Scan Measurement Locations F8000106A0041GS to F8000106AO050GS (D 28 sq. meter field of view 00 Total Scan Area: 280 sq. meters 0

Do FWa~rehouse B 000 south edge of road 00 0 CO M)0 3 3 3 020 Turbine Building U,

o000 4:

N C)I C) Maintenance

,., Shop 0 5 10 Distance in Meters oN

Attachment 2 Instrumentation February 22, 2009 Survey Unit F8000106

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

ISOCS N/A 1983920 Asphalt - 3.37E-01 pCi/g Cs-137 CAsphalt - 2.68E-01 pCi/g Co-60 Concrete - 995 dprr/100 cm22Cs-137 ISOCS N/A 1983920 Concrete - 701 dpm/100 cm Co-60 Table 2-2. Investigation Criteria and DCGL Instrument Parameter Value ISOCS Investigation Criteria - Scan Asphalt 20 pCi/g Cs-137 ISOCS Investigation Criteria - Scan Concrete- 4,300 dpm/100 cm 2 Cs-137 All DCGLW 51.2 Cs-137 12.6 Co-60 All DCGLW 43,000 dpm/100 cm 2 All DCGLEMC N/A Page 2 of 2 Att. 2 Instrumentation F8000106

Attachment 3 Investigation February 22, 2009 Survey Unit F8000106 (none required)

Attachment 4 Data Assessment February 22, 2009 Survey Unit F8000106

F8000106 Quantile Plot Cs137 DCGL = 51.2 pCi/g (t~

0 0.320 A

0.310 0.300 U

A

>. 0.290 0.29

-CD 0.280 0.270 0.260 -P 00 o

0 20 40 60 80 100 C)

C) Percentile SActivty - Median - 75th Percentile 50th Percentile

o(D F8000106 Scatter Plot w Cs137 DCGL = 51.2 pClig 5.00E-01 V 0

4S50E-01

,4%00E-01 U 3.50E-01 4:- CL 1.331 So0 0 aDDE-01o 0 0 0 0.290 pj Cd) 2.50E-0. a a - a a a a a a a a a a a - a a a a a a - - a - - I*

D-248 2,.00E-01 1.50E-01

!,00E-01 I.

00 0 0 0 0 0 0 0 0 0 0 0 0

<urmn<L Meas<

00 Measurement Locations 0

0Activt

. A cti ty iI

......... Average- "+3StDer .. .." -3StDev

F8000106 Frequency Plot (I0 (t~

Csl 37 DCGL = 51.2 pCi/g 0

6 5

Cr 4-3-

U.

• Cj2

-0 (t~ 0 2-.

(D. 0f 1-0

/

N N 00 C) rII (0 CP 03V C)

IV, Bins - Upper End Value (pCi/g)