ML17065A070

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Final Status Survey Summary Report, February 1, 2017, Iosb Truck Bay, Survey Unit F8300053
ML17065A070
Person / Time
Site: Rancho Seco
Issue date: 02/01/2017
From:
Sacramento Municipal Utility District (SMUD)
To:
Office of Nuclear Material Safety and Safeguards
Shared Package
ML17065A032 List:
References
DPG 17-038
Download: ML17065A070 (18)
v • d • e


Text

Approved By:

I Rancho Seco Final Status Survey Summary Report February 1, 2017 IOSB Truck,Bay Survey Unit F8300053 FSS Engineer

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Date: :J4~ftz 0

Manage:::S::co Assets

mNAL STATUS SURVEY F8300053 Survey Unit:

F8300053, Interim Onsite Storage Building (IOSB) Truck Bay Survey Unit

Description:

Operating History: The Truck Bay was designed as a location for loading and unloading of transport vehicles. There was a known area of contamination near the loading dock.

This area was fully characterized during the scoping surveys.

Site Characterization: Static measurements were made on the floor, walls, and ceiling, to confirm the absence or presence of plant-derived radionuclides. Static measurements showed a mean gross beta activity level of 2,374 dpm/100 cm2 and a maximum value of 3,517 dpm/100 cm2

  • An area of known contamination is located at the loading dock area. This area was characterized to determine the extent and highest activity. The elevated area covers an approximately 7.5 m2 around the loading dock. A small area (less than l.O m2) exceeded the DCGLw with activity detected as high as 249,491 dpm/l 00 cm2. The elevated area will be designated as a Class 1 area requiring remediation. A Class 2 area will buffer the elevated area from the remainder of the truck bay. The remainder of the truck bay is classified as a Class 3 survey area and is the subject of this report.

Survey Unit Design Information:

The Survey Unit Design Parameters are presented in Table 1. The survey unit and measurement locations are depicted on the maps in Attachment 1. Static measurement locations were randomly determined and approximately 11% of the area scanned. The instrumentation used for the survey along with the MDC values are listed in Table 2-1.

FSS Truck BAY f 8300053

FINAL STATUS SURVEY F8300053 Table 1, Survey Unit Design Parameters

.Evaluatfoh,1n*J>LifS/~1ue$**

'. *,v*
:*... *,
  • comm~ilts' '

..,~... *.

Survey Packaqe:

F830 Truck Bay Survey Unit:

05 Class 03 SU Area (m 2) 379 Evaluator:.

JR DCGLw:

43,000 Gross Activity DCGL Area Factor N/A Class 3 Desiqn DCGLemc (dpm/1 OOcm2):

N/A Class 3 DCGLemc:

N/A Class 3 LBGR:

21,500 Default = 50% DCGL Siqma:

466 Scooinq Survey Data Type I error:

Cl.OS Type II error:

0.05 Predominant Nuclide Cs-137 Sample Area (m2)

N/A Total Instrument Efficiency:

0.132 Total Area Scanned (m2):

45.5 Scan Coverage(%)

  • .':!;~:+1:%.* Class 3 Choosing 'N/A' sets material Material Type:

N/A backqround to "O"

. * *.cafo.Li1ateC1-VaWes.*:~:..,:<}':,.. ;.L.... ;;:.*..,..... *cofohle'ilfs':.._ * *

  • Z1-<<:

.. 1:645 Siqn p:

0.998135 Calculated Relative Shift 46.1 Relative Shift Used:

3.o Uses 3.0 if Relative Shift >3 N-Value:

11 N-Value+20%:

14 2

FSS Truck BAY f 8300053

FINAL STATUS SURVEY F8300053 Survey Results:

A total of 15 direct measurements were made in F8300053. The results of the static measurements are shown in Table 2. All of the static measurements were less than the DCGL. None of the scan measurements indicated areas of elevated activity. Swipe data did not indicate elevated activity levels above the MOA.

Table 2, Static Measurement Results

  • Num~er Sample#,*

'Beta*

,e~ta

"' ;(cpm)

  • (~pnif100 cmi!).

1 F8300053C00001 222 1,721 2 F8300053C00002 225 1,744 3 F8300053C00003 238 1,845 4 F8300053C00004 279 2, 163 5 F8300053C00005 268 2,078 6 F8300053C00006 221 1,713 7 F8300053C00007 238 1,845 8 F8300053C00008 256 1,984 9 F8300053C00009 264 2,047 10 F8300053C00010 219 1,698 11 F8300053C00011 332 2,515 12 F8300053C00012 361 2,735 13 F8300053C00013 446 3,379 14 F8300053C00014 449 3,402 15 F8300053C00015 360 2,727 Table 3 contains the statistical summary of the static measurement data for the Truck Bay.

Table 3, Beta Summary Statistics Beta Static Truck Bay Mean 2,240 Median 2,047 Standard Deviation 582 Minimum 1,698 Maximum 3,402 Count 15

.)

FSS Truck BAY F8300053

FINAL STATUS SURVEY F8300053 Survey Unit Data Assessment:

The survey design required 14 static measurements for the Sign Test. A total of 15 static measurements were collec~ed. The critical value and the results of the Sign Test are presented in Table 4. The sample mean and median values were less than the DCGL. The sample standard deviation was greater than the design standard deviation but both values of sigma resulted in a relative shift greater than three (3 ), no additional samples were required.

Table 4, Data Assessment Results Stati~.t:>"~ta Viifo~~'.... '* * * *.*

ci>mrn~n~s

  • Number of Samples:

15 Median:

2,047 Mean: 2,240 Static Data Standard Deviation:

  • . 582 Maximum:

3,402 Adjusted N Value:

14 S+ Value:

15 Critical Value:

10 Sufficient samples collected:

Pass Maximum value <DCGLw:

Pass Median value <DCGLw:

Pass Mean value <DCGLw:

Pass Maximum value <DCGLemc:

N/A Sign test results:

Pass The survey unit passes all conditions:

Pass 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, the ALARA criterion has been met.

Changes in Initial Survey Unit Assumptions:

The survey unit was designed as a Class 3 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, this did not affect the relative shift 4

FSS Truck BAY f 8300053

FINAL STATUS SURVEY F8300053 as both were in excess of maximum amount and required adjustment to 3.0 No potential areas of elevated activity were detected.

==

Conclusion:==

The FSS of this survey unit was properly designed as a Class 3 survey based on the results of the scoping survey. 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 static measurements were less than the DCGL. No investigations were required. _

The static 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 f 8300053 meets the release criteria of 10CFR20.l402.

5 FSS Truck BAY f 8300053 Maps February 2, 2017 Survey Unit F8300053

Ceiling F8300053C00012 P = 2,735 dpm/100 cm2 F8300053C00015 p = 2,727 dpm/100 cin2 F8300053C00007 P = 1,845 dpm/100 cm2 North Wall F8300053C00009

. p = 2,047 dpm/100 cm2 F 8300053COOOOB P = 1,984 dpm/100 cm2 F8300053C00001 p = 1, 721 dpm/~ 00 cm2 F8;300053C00011 p = 2,515 dpm/100 cm~

FB300053C00006 p,,; 1,713 dpm/100 cm2 Floor East Wall F8300053C00005 p = 2,07~ dpm/100 cm2 F8300053C00014 p = 3,402 dpm/100 cm2 F8300053co0004

~

p = 2, 163 dpm/100 cm 2 F8300053C00002 P = 1,744 dpm/100 cm2 South Wall F8300053C00013 p = 3,379 dpm/100 cm2 TIDEWATER INC F8300053C00003 p = 1,845 dpm/100 cm2 8300053C00010 p = 1,698 dpm/100 cm2 RA010LOGICAL SE;RVtCE!S SMUD Apprcwd by.

l'.a Results ApprowJ dote:

Rev No.:

2 Page 1 Att. 1 Maps F8300053

'Instrumentation February 3, 2017 Survey Unit F8300053

Table 2-1. Survey Unit Instrumentation Jyl,¢as~rein.ent

. Tnstru ~.~* __ en_. t Typ~

.. * *.** *1)-i>e.

Beta Static Measurement Beta Static Measurement Swipe Measurements Swipe Measurements Ludlum Model 2350-l Ludlum Model 44-1 l 6 B Detector Ludlum Model 2350-1 Ludlum Model 44-116 B Detector Ludlum Model 2929 Ludlum Model 44-l 0-1 Ludlum Model 2929 Ludlum Model 44-10-1 Minimum Dete~table;Activiti

  • Detecto1*
  • ". -Efficiencies Beta - 510 dpm/l 00 cm2 12.9%

Beta - 556 dpm/l 00 cm2 13.2%

Beta - 75 dpm/100 cm2 43.4%

Beta - 77 dpm/100 cm2 43.4%

. (:;_~l~b'1:atio~

Di!e'Dateb

  • \\' :*;-

317899/331973 2/10/17 317897/331972 2/10/17 182597 /188736 5/13/J 7

] 82597 /188736 5/13117

  • Mini.mum detectable activities for the count rate instrumentation were calculated in accordance with NUREG-1507, "Minimum Detectable Concentrations with Typical Radiation Survey Instruments for Various Contaminants and Field Conditions" (U.S. NRC, 1997).

b Detectors are required to be calibrated once every 12 months. Calibration due date indicates the date by which the detector must be calibrated again.

cm2 = square centimeters cpm = counts per minute dpm =disintegrations per minute Pagel Att. 2 Instrumentation f 8300053

Static Measurement MDA Beta Survey Type PR331973 Detector Number 182 Background count rate (cpm)

Count Time (min) 0.129 Efficiency 100 Area of Detector ( cm2)

Constants 60 sec/min 2.54 cm/in Assumptions Background count time and sample count time are equivalent Calculate Static MDA Static MDA =3 + 4.65(Br

  • t)0*5/t
  • E

Where:

Br Background Countrate t

Count Time (min)

E Efficiency A

Area of detector (cm2)

Static MDA 510 dpm/100 cm2 Page 2 Att. 2 Instrumentation f 8300053

Beta Survey Type PR331972 Detector Number 229 Background count rate (cpm) 1 Count Time (min) 0.132 Efficiency 100 Area of Detector ( cm2)

Constants 60 sec/min 2.54 cm/in Assumptions Background count time and sample count time are equivalent Calculate Static MDA Static MDA =3 + 4.65(Br

  • t)0*5/t
  • E

Where:

Br Background Countrate t

Count Time (min)

E Efficiency A

Area of detector (cm2)

Static MDA 556 dpm/100 cm2 Page 3 Att. 2 Instrumentation f 8300053

Att. 3 Investigation Investigation February 2, 2017 Survey Unit F8300053

  • (none required) f 8300053 Data Assessment February 3, 2017 Survey Unit F8300053

Histogram for Beta Static Activity (dpm/100cm2) Truck Bay

' i I. I 21145 2385 2726 Page I Att. 4 Data Assessment F8300053 l

3'00 jAclivip i Numben::iVM!M MNrun SD Kurtosis I

G:!LenBf'>t nMoce8rn I

I ~

1,G97.67~*

J,401.52 581 75 1 ool oosj 2.23965 2.1146.51 I

i I

I

Q..Q Plot for Beta Static Activity (dpm1100cm2) Truck Bay vso 1150

  • 1.5

-0.5 aa a.s Theoretical Quantile* (Standard Nonna!)

Page2 Att. 4 Data Assessment 1.Q 1.5 F8300053 AclivlJ tl*lS Mean*22'40 Sd*SBl.B S"°'*"".2 lrte<<:ctt*22-'0 Con~.R*0.921

Copy of Swipe Sheet truck bay SR.xlsx IOSB Final Status Sl!rvey.

LCl LC2 LC3 lC4 LC6 LCS f3CPM 13 dpm Date/Time of Count Sample Comments l

F830 oos 3

c OOOOJ SM Truck Bay 63 35 01/04/17 1419 2

  • F830 005 3

c 00002:

SM Truck Bay 51 8

01/04/17 1416 3

F830 005 3

c o0oo3 SM.

Truck Bay 63 35 09/21/16 0846 4

F830 005 3

.c 00004.

SM Truck Bay 47

  • 2 01/04/17 1418 s

f830 6os 3. c 00005.'. SM Truck aav 43

-11 09/21/16 0847 6

F830 005.

3

~ 00006 SM

Truck &y 42

-13 09/21/16 0848 7

F830_,.oos 3

c*- :o0oo1 SM

_Truck Bay 39

-20 09/21/16 0849 B

F83b 005_.

3 C* 00008

  • SM TruckBay 49 3

01/04/17 1421 9

F830

,oos.

3*

c o0oo9 -_**sM Truck.. &v:*

41

-15 01/04/17 1422 10 F830 oos

  • 3.

c_, 0001..0._SM True!< Bay so s

09/21/16 0850 11 F830.

005 i t. 00011 SM

. 'TruCk Bay 45

-6 09/21/16 0852 12 F830

.005

'3 c *00012 SM Truck.Bay 41

-15 09/21/16 0853 13 fl\\3!l oos 3

,C. :00013 SM

, Truck Bay 52 10 09/21/16 0855 14 FS30 005 3

C" 'OOOJ4. *sM

  • - *Truek Bay.

46

-4 09/21/16 0857 15 F830 005 3

c odo1S SM Truck Bay 52 10 09/21/16 0858 Comments Bv sjgniJture below. the required source check iJnd background checks were stJtisfaetorily performCd prior to use of the instrument identified below.

First Beta background* 1/4/17. Second Beta background

  • 9/21/16 Ludlum 2929 Benchtop Instrument u;.r.

cff'.cicfll."I/

bier, 1.v1.111t 2929 S/N: 182597 rate ti*m:

MOA

~

44.8 l

74.7 0.434 43-10-1 S/N: 188736 cpm min do,111e-r trea Tech A Sign/ Date

. c.. ~:f":~:r~:**..

9/21/2016 47.7 l

77.0 Cal Due Date: 5/13/2017 f3 0.434 Tech B Sign/ Date cpm min dpm P*:! il~~.1 Pagel of 1 Page 3 Att. 4 Data Assessment F8300053

IOSB Final Status Survey LCl LC2 LC3 LC4 LC6 LCS p CPM ri dpm Dalo/Time of Count Sample Comm¢nts 1

F8!10 00$

J c 00001 SM

  • rruck Boy 63 35 01/04/17 l.4 i9 2

FB30 005 3

c 00001 SM rruck Boy 51 8

Ol/04/17 141.G 3

i'Qf!O oos 3

c:

0()0()3 SM Truck Boy 63 3$

09/il/16 0~46 4

F~30 005 3

c 000()4 SM Trvc~ l\\ny 47

-2 01/04/l?

1418 5

F530 oos 3

c oooos 5M Truck Bay 43

-11 09/21/16 0847 6

FS30 DOS 3

c 00006 SM Truck Uoy 42

-13 09/2V1G OS4_$_

7

~830 00~

3 c

000/))'

SM lwck soy 39

  • 20

- 09/21/16 0849 a

1'830 00~

3 c

00008 SM Truck 6*Y 49 3

OU04/17 l.47. l 9

F830 oos 3

c 000011 SM Tr\\t,k _6*1Y 41

  • 15 01/04/l?

1422 10 FS30 005

_3 c 00010 SM Truck B~Y 50 5

09/21/16 0850 11 F830 005 3

c 00011 SM Truck Boy 45

-6 09/21/16 0852 12 f.830 005 3

c 00012 SM Truck Bey 41

  • 15 09/21/16 0853 13 F830 005 3

c 0001!1 SM

'(ruck Doy 52 10 09/21/16 0855 14 mo 00~

3 c 00014 SM iruck B.1y 46

.4 09/21/lG 085?

15 F830 oos 3

c 00015 SM Truck B*y 52 10 09/'-i/16 0858 cornments By signature bQf{lW, the 1equlwd sou1ce che(k and background checks were sntlsfnctorllv performed prior to u*r. of tho ln.trumonr ldonrlflod b.,1.w1.

~lrst Seta batkground" 1/4/17. Seco11d Beta bacl<Jlround

  • 9/21/16 Lu!ll~rrt ~gig Bonchtop Instrument ltkR olfir;i4Jnq*

b~U Counl 7.97.9 S/N; 182597 rate IHHC MDA

~

4M,8 1

74.7 O/l3'1 A

43-10*1S/N;188736 com rn:11 clpmpr.r.:1rn;J

~_,,-.;

.~

Tc~h A Sign/ 0;1t<J ~4J~f1

,l/J!'I....

2/3I17-p 47.7 l

77.0 Cal Due Oate: 5/i3/20i7 0.'13*1 Tech Cl Si~11/ Date cpm n"lln r.lon, p~r ll'*~il rar.c 1 of l Page4 Att. 4 Data Assessment F8300053

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