ML17065A038

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Final Status Survey Report, October 21, 2016, Iosb Storage Cell A-1, Survey Unit F8300163
ML17065A038
Person / Time
Site: Rancho Seco
Issue date: 11/08/2016
From:
Sacramento Municipal Utility District (SMUD)
To:
Office of Nuclear Material Safety and Safeguards
Shared Package
ML17065A032 List:
References
DPG 17-038, F8300163
Download: ML17065A038 (16)
v • d • e


Text

Rancho Seco Final Status Survey Summary Report October 21, 2016 IOSB Storage Cell A-1 Survey Unit F8300163 FSS Engineer Reviewed By:~ Date: / D-2( *( ('.,

LeadFSSEn9ineer ApprovedBy: A+.~ Date:

11

/e/ZCJ1£ Manager, Rancho Seco Assets

FINAL STATUS SURVEY F8300163 Survey Unit:

F8300163, Interim Onsite Storage Building (IOSB) Storage Cell A-1 Survey Unit

Description:

Operating History: Designed primarily to store packaged radioactive waste containers safely, protected from the elements, and maintain radiological dose as low as reasonably achievable (ALARA), each storage cell possibly stored media of many types, including filters, resins, contaminated chemicals, DAW, activated reactor components,

'contaminated plant components and other contaminated items.

Site Characterization: Static measurements were made of the interior surfaces of the storage cell, to confirm the absence or presence of plant-derived radionuclides. Static measurements showed a mean gross activity level of 4,221 dpm II 00 cm 2 and a maximum value of 4,873 dpm/100 cm2

  • Based on the levels of gross activity reported, the area was determined to be a Class 3 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. Static measurement locations were randomly determined and approximately 27% of the area scanned. The instrumentation used for the survey along with the MDC values are listed in Table 2-1 .

1 FSS Storage Cell A-1 F8300163

.FINAL STATUS SURVEY F8300163 Table 1, Survey Unit Design Parameters

.* :.. ** * * , ~ con:lhi~nts Survey Packaqe: F830 Storaqe Cell A-1 Survey Unit: 016 Class 3 SU Area (m2) 27.5 Evaluator: JR DCGLw: 43,000 Gross Activity DCGL Area Factor NIA Class 3 Design DCGLemc (dpm/100cm 2 ): N/A Class 3 DCGLemc: NIA Class 3 LBGR: 21,500 Default= 50% DCGL Sigma: 303 Scoping Survey Data Type I error:

Type 11 error: 0.05 Predominant Nuclide Cs-137 Sample Area (m2) N/A Total Instrument Efficiency: 0.129 Total Area Scanned (m 2): 7.51 Scan Coverage(%) ~>::;::~~Y,~%f~ Class 3 ChoOsing 'N/A' sets material Material Type: N/A background to "O"

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    _;.ca 1-:~1~-tecf\/.ii'i*~~sY::~Hi?t:;;.};;12:.fT :.~':~:;::t*;:*: *.*,,:;:csmih~'nt$;i~*** /.".: . . ,-. *.> ;'

Z1-a: . '.1.64°~(

Z1-a: 1.645.

Siqn p: 0.99865' Calculated Relative Shift: *..

  • 70.9
  • Relative Shift Used: :to Uses 3.0 if Relative Shift >3 N-Value:

N-Value+20%:

2 FSS Storage Cell A-1 F8300163

FINAL STATUS SURVEY F8300163 Survey Results:

A total of 15 direct measurements were made in f 8300163. 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 MDA.

Table 2, Static Measurement Results

  • N~rnb~r *.; * * * . *. §a!riJlle'# * * * " . ' ,Beta (CPn1)' ' ~eta(~pm) 1 F8300163X00001 222 1,721 2 F8300163X00002 226 1,752 3 F8300163X00003 270 2,093 4 F8300163X00004 249 1,930 5 F8300163X00005 208 1,612 6 F8300163X00006 234 1,814 7 F8300163X00007 246 1,907 8 F8300163X00008 234 1,814 g F8300163X00009 202 1,566 10 F8300163X00010 242 1,876 11 F8300163X00011 255 1,977 12 F8300163X00012 239 1,853 13 F8300163X00013 264 2,047 14 F8300163X00014 241 1,868 15 F8300163X00015 248 1,922 Table 3 contains the statistical summary of the static measurement data for the Storage Cell A-1.

Table 3, Beta Summary Statistics Beta Static A-1 Mean 1,850 Median 1,868 Standard Deviation 145 Minimum 1,566 Maximum 2,093 Count 15 3 FSS Storage Cell A-1 F8300163

FINAL STATUS SURVEY F8300163 Survey Unit Data Assessment:

The survey design required 14 static measurements for the Sign Test. A total of 15 static measurements were collected. 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

  • . cpmrn~nts . . *. .

Number of Samples: 15 Median: .1,8(38 .

Mean: . 1,850 Static Data Standard Deviation: .145 .

Maximum:

  • 2,09.3 Adjusted N Value:
  • 14 S+ Value: * :.15*

CritiCal Valu9: . *10 * --- --- - ---- *

~ . .t::HY::: ?/: ;Y:~:C'~it~h~~$atl~tac.~!91:l:':F*-<.' ;:;:::::?Y:):::'.;;,??;o*,:*,;-.: :*:*.< .* .. 3::dmm'jfnts** ::*:~/" . ,*;>: '.**...*.

Sufficient samples collected: . Pass,.

Maximum value <DCGLw:

Median value <DCGLw: Pass Mean value <DCGLw: Pass Maximum value <DCGLemc: N'/A Sion test results: Pass The survev 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. No potential areas of elevated activity were detected.

4 FSS Storage Cell A-1 F8300163

FINAL STATUS SURVEY F8300163

==

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 F8300163 meets the release criteria of 10CFR20.l402.

5 FSS Storage Cell A-1 F8300163

Attachment 1 Maps September 23, 2016 Survey Unit F8300163

F8300163X0007 fl= 1,907 dpm/100 cm' A-1 A-2 A-3 B-1 B-2 B-3

~ F8300163X0010 I' = f.876 dpm/100 cm

  • D-1 0-2 ().3 F83001 0005 E-1 E-2 E-3 13 = 1,612 pm/100cm'

~

~F8300163X0002 p =- 1.702 dpm/100 an'

$ F 00163X001 1 r> = 1.977 dpm/100 cm*

F8300163X0013

~

f.> = 2,047 dpm/100 cm* F8300163X0004~

F8300163 o 03 ts= 1.930 dpm/100 cm*

p " 2.093 p 1100 cm' ~

F83001 3X0006 p =1,814 dpOJ/100 cm* $ F8300163X0012 rs =1 853 dpm1100 cm*

Reference Point F8300163X0008 ~

fl=- 1 814 dpm/100 cm F8300163X0014 fl = 1 868 dpm/100 cm*

~

F8300163X0009

(.I= 1 566 dpm1100 an'

~

TIDEWATER IN RADlOLOGICAL SERVI CES F8300163X0015

<J = 1 922 clpm/100 cm' I NTERIM ONSITE:STORAGEBUILDING (1058)

Contract No.: 4'.Alll!l'J l42!. SMUO location : f\ d11<.l 10 xto i.;Y:;.:.

o::..;:

sk:.:::

.::.:..:.:.._-+- - -=-

f .,-!11-'d.,-I ~ l:-d-,.-

\u-,,------j Approved by. F8300163X0001 Orawinq No~ TOSS r in~ I <,t a h1 ~ ~11 rvP p = 1 721 dpm/100 cm'

Description:

C' I:' 11 A I ,,,....,, I t r. ~ J lr.J Drawn B .

~O~C'~d::_:- - - rl..:RP=P"""  ; ; . . - - - - - - - i Ap ro..al date:

Cote! l1 11U lll t.

Rev No.: J Page 1 Att. 1 Maps F8300163

Attachment 2 Instrumentation September 22, 2016 Survey Unit F8300163

I*

Table 2-1. Survey Unit Instrumentation M.easurement Minim1pil Detect.able Activity" Dete~tor Calibration l_nstrument Type Due Dateh Typ~ . Efficiencies Beta Static Ludlum Model Beta - 548 dpm/100 cm 2 12.9% 317899/331973 Measurement 2350-1 2/10/17 Ludlum Model 44-1 16 B Detector Swipe Ludlum Model 2929 Alpha - 11 dpm/l 00 cm 2 36.9% 166716/170380 Measurements Ludlum Model 44- Beta - 83 dpm/100 cm 2 42.8% 11/3/16 10-1

  • Minimum 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.

cm 2 = square centimeters cpm = counts per minute dpm =disintegrations per minute Page 1 Att. 2 Instrumentation F8300163

Static Measurement MDA Variables Beta Survey Type 331973 Detector Number 212 Background count rate (cpm) 1 Count Time (min) 0.13 Efficiency 100 Area of Detector (cm 2)

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 548 dpm/100 cm 2 Page 2 Att. 2 Instrumentation F8300163

Attachment 3 Investigation September 22, 2016 Survey Unit F8300163 (none required)

Att. 3 Investigation F8300013

Attachment 4 Data Assessment September 22, 2016 Survey Unit F8300163

Histogram for Beta Static Activity Cell A-1 rA-;,1iv~

NurOOerdValue~ 151 Mfn.m 1.5'5Jl9 M""""" 2.cro.021 1

SD 145.34 51-:.ewr.e:t. -0.39' Klrlo~is 0.02\

~=~i SMe/Jlll E'.)Me.ian 0Norf!>>ID1itr'butio!1 OLe:sBWI:

OMCV"eSfu 1581 1950 1634 161'7

"'" 1S4S 1098 2003 Page 1 Att. 4 Data Assessment F8300163

Q..Q Plot for Beta Static Activity Cell A-1 AclivQ N* 15 2100 Melln*lR&l Sd*145.3 5'°""*150.Z l~*lfi>

Ccrtebtion.R *0.987 aewnLne 1980 19'.'0 *I 10Ql *./

~

ti

<(

1800 17-iO 1600 1610 1560

  • 1.S *1.0 -0.5 no 1.0 1.5 Theoretical Quantiles (Standard Normal)

Page2 Att. 4 Data Assessment F8300163

Srnear_Da ta_ Calcula tion_Sheet_)O 1316 I IOSB Final Status Survey l LCl LC2 LC3 LC4 LC6 LC5 fl CPM (J dpm Date/Time of Count Sample Comments l F830 016 3 x 00001 SM Cell I\ 1 53 -1 I 09/01/16 08:19 2 F830 016 3 x 00002 SM Cell A-1 49 -J.O i 09/01/16 08:20 016 x 00003 SM Cell A-1 68 I 3 FIDO ] 34  ! 09/01/16 08:22 iI 4 F830 (JJ.6 3 x 00004 SM Cell /\-1 46 -17 I 09/01/16 08:23

,-J FBJO 016 3 x 00005 SM Cell J\-:1 so -8 I

I 09/0J./16 08:24 i

6 F830 016 3 x 00006 SM Cell A- .L 49 -10  ! 09/01/16 08:25 7 FBJO 016  :~ x 00007 SM Cell /\-1 40 -31  ! 09/01/16 08:26 I

8 F830 016 3 x 00008 SM Cell A*l 45 -20  ! 09/01/16 08:28 9 F830 01.b :i x 00009 SM Cell A-1 '.)3 -1 I 09/01/16 08:29 10 F830 016 ] x 00010 SM Cell /\-1 48 -13 I 08:30 I 09/01/16 x SM '

I 11 F830 ()J.b 3 00011 Cell A-1 62 20 I 09/01/16 08:32 I

12 F830 016 3 x 00012 SM Cell A**l 55 4 i 09/01/1.6 08:33 13 F830 016 _,-, x 00013 SM CdlA*l 67 32 I 09/01/.1.6 08:3.5 F830 x 00014 SM

~----

Cell A-1 I

--- ---*-------------~----

VI 016 J 53 -1  ! 09/01/16 08:36

--- ------ --- -- -- -------*- I

].'.) F830 016 J x 00015 SM Cell I\* l 52 -3  ! 09/01./16 08:37 Comments 13y :;ignaLure below. Lile required source check and background check~. were satisfaborily performed prior Lo use ol' Lile instrument identified below.

~

Ludlum 2929 Benchtop Instrument

!Jkf'.

- dlicir:,ncy bkg C:Ollnl' 2929 S/N: 16G716 r;:ite time MIM i 0.4 1 J.1.0

<X 0.369 44 J S/N: J.70380 cpni min clprn pt!r an:;1 11 Tech A Sign/ Date '-4.A?<--..

~,- ""- ,- y'A~

    • <.r1 11n '. 'i3.4 l 82.il-Tech H Sir,n/ D~te v NIA Cal Due Oate:!ll/3/2016 r~ 0.428 cpm min dprn fH.'r ~ln;:1 Page 3 Att. 4 Data Assessmetit F8300163
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