ML17065A053

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Final Status Survey Summary Report, December 12, 2016, Iosb Storage Cell D-3, Survey Unit F8300273
ML17065A053
Person / Time
Site: Rancho Seco
Issue date: 12/22/2016
From:
Sacramento Municipal Utility District (SMUD)
To:
Office of Nuclear Material Safety and Safeguards
Shared Package
ML17065A032 List:
References
DPG 17-038
Download: ML17065A053 (16)
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Text

I , ....... -..i Rancho Seco Final Status Survey Summary Report December 12, 2016 IOSB Storage Cell D-3 Survey Unit F8300273 Prepared By:_2~4" "'-+.-*(J- =-l _ _ _ _ Date:

FSS Engineer

\2-. / 3. I (p Approved By: £Yb~. Dam:

Manage:: a : : S : :Assets

FINAL STATUS SURVEY F8300273 Survey Unit:

F8300273, Interim Onsite Storage Building (IOSB) Storage Cell D-3 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 1,975 dpm/l 00 cm 2 and a maximum value of 2,304 dpm/I 00 cm 2

  • 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 33% of the area scanned. The instrumentation used for the survey along with the MDC values are listed in Table 2-1 .

FSS Storage Cell D-3 f 8300273

FINAL STATUS SURVEY F8300273 Table 1, Survey Unit Design Parameters

. ;e\;aluatlonjil'put Valiies' ,,

. cfommt\iii,is *

  • Survey Packaqe: F830 Storaqe Cell D-3 Survey Unit: 027 Class 3 SU Area (m 2) 23 Evaluator: JR DCGLw: 43,000 Gross Activity DCGL Area Factor N/A Class 3 Desiqn DCGLemc (dpm/100cm 2 ): NIA Class 3 DCGLemc: N/A Class 3 LBGR: 21,500 Default 50% DCGL =

Siqma: 145 Scopinq Survey Data Type I error: 0,0.5 Type II error: 0.05 Predominant Nuclide Cs-137 Sample Area (m2) N/A Total Instrument Efficiency: 0.132 Total Area Scanned (m2): 7.51 Scan Coverage(%) *3~%' Class 3 Choosing 'N/A' sets material Material Type: N/A backqround to "O"

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: ... *:c*~Ic~iat~~,.Vaiu~s .,:.< _* .,. <<;;::: ,:.:-;.:?'. :w.:. *e;*9,:ncfu~nts *:.,_*:>.;, .,.

Z1-a: 1.645 Z1-0: 1.$45 Siqn p: 0.99865 Calculated Relative Shift: 148.2 Relative Shift Used: 3.0 Uses 3.0 if Relative Shift >3 N-Value: 11 N-Value+20%: *14 2 FSS Storage Cell D-3 f 8300273

FINAL STATUS SURVEY F8300273 Survey Results:

A total of 15 direct measurements were made in F8300273. 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 Number *sample #* * ~eta (c'pm) Beta (dpm) 1 F8300273X00001 263 1,992 2 F8300273X00002 266 2,015 3 F8300273X00003 261 1,977 4 F8300273X00004 304 2,303 5 F8300273X00005 268 2,030 6 F8300273X00006 262 1,985 7 F8300273X00007 262 1,985 8 F830_02I3XQ.OQ08 244 1.848 9 F8300273X00009 248 1,879 10 F8300273X00010 241 1,826 11 F8300273X00011 244 1,848 12 F8300273X00012 241 1,826 13 F8300273X00013 286 2, 167 14 F8300273X00014 278 2,106 15 F8300273X00015 308 2,333 Table 3 contains the statistical summary of the static measurement data for the Storage Cell D-3 Table 3, Beta Summary Statistics Beta Static Storage Cell 0-3 Mean 2,008 Median 1,985 Standard Deviation 161 Minimum 1,826 Maximum 2,333 Count 15 3 FSS Storage Cell D-3 f 8300273

FINAL STATUS SURVEY F8300273 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.

Table 4, Data Assessment Results

  • ..: ,. te>i:rim'ents Number of Samples: 15 Median: 1,985.

Mean: 2,008 Static Data Standard Deviation: 161 Maximum: 2,333

._:J  :<,,.* .. *~ .. *'*.'

Adjusted N Value: 14 S+ Value: 15 Critical Value: 10

'* ..... '

  • Cpmm~nts*

Sufficient samples collected: Pass Maximum value <DCGLw: Pass Median value <DCGLw: Pass Mean value <DCGLw: Pass Maximum value <DCGLemc: NIA 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 Jess 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, none of the survey results exceeded I 0% of the DCGL. No potential areas of elevated activity were detected.

4 FSS Storage Cell D-3 f 8300273

FINAL STATUS SURVEY F8300273

==

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 F8300273 meets the release criteria of I OCFR20.1402.

5 FSS Storage Cell D-3 F8300273

Attachment 1 Maps December 12, 2016 Survey Unit F8300273

A- I A-2 A-3 B*l B*2 B-3 c

C* 1 0- 1 0-2 0-3 Fa3oo~~ XOOIO ~

I* 18~'.lp~>llOOO"n' E* I E*2 E*J 00:7 J)(O()OO r 1 9,0.5 ,..111100 ()'? * ~

f1i. F830027JX 12 l1 I 26dp 100cm'

~ F :oor3Xooo2 F8300~i~X0007 ~

1 - .' o*sd!>m11t:>ocm ~ I 9&"* <lpm/100 cm*

~

FE.300"ll3Y.0005

~ ~ 030o:!prr/100cm' F630027JXOO* I d) em' 1* * : 167 *JPrn i100cm F8300:?13XOOO F8300273X001 I I* - I 977 Upm/100 on*

$1 I 8481$pml100cm' ~

SMUD TIDEWATER INC RAD ,Ol.OOK."A\. SCtNtC'<.-,

INTl!:AIM ONSIT I!: STOA AG I! BUIL DING (1056)

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  • ~ ........ Apptowl. dole:

IWl?HJlh Page I Att. I Maps f 8300273

Attachment 2 Instrumentation December 12, 2016 Survey Unit F8300273

Table 2-1. Survey Unit Instrumentation Mil1intuin.Detec'table Activity~ . . peteCt9r Calibratioi1

  • Insh'u111ei1t Type . Due Di!t.~i; Effidendes Beta Static Ludlum Model Beta - 584 dpm/I 00 cm 2 13.2% 317897/331972 Measurement 2350-1 2/10/17 Ludlum Model 44-1 16 B Detector Swipe .Ludlum Model 2929 Beta - 76 dpm/100 cm 2 43.4% 182597/188736 Measurements Ludlum Model 44- 5/13/17 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 Pagel Att. 2 Instrumentation f 8300273

Static Measurement MDA Variables Beta Survey Type PR331972 Detector Number 254 Background count rate (cpm) 1 Count Time (min) 0.132 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 584 dpm/100 cm 2 Page 2 Att. 2 Instrumentation f 8300273

Attachment 3 Investigation December 12, 2016 Survey Unit F8300273 (none required)

Att. 3 Investigation f 8300273

Attachment 4 Data Assessment December 12, 2016 Survey Unit F8300273

Histogram for Beta Static Activity (dpm/100 cm2) Cell 0-3 15 Mnffl.l'n 1.825.'lG M~ 2.333.JJ I so 161351 Skewr~' 0.83 Kurlosit 0.00 8 Maan 2.1'.DiOO 8Me<Mn 1,!8t85 9 tloimal Oistrbmn 0Len8m OM0te8nt l

1027 18111 I

"'"' 19111 2132 2183 = 228< ZlJ5 Page I Att. 4 Data Assessment F8300273

AcliY~

Q-Q Plot for Beta Static Activity (dpm/100 cm2) Cell D-3

'1*15 Mtw1* 200R Sd* 161.'

S'°"'* 160.9 lnretc~*2000 C'.a1el&licir.. A*0.3S2

'160 1900 1030

  • 1.5 *1.0 -05 0.0 0.5 ! 1.0 1.5 Theoretical Quantiles (standard Nonna!)

Page 2 Att. 4 Data Assessment f 8300273

Smear_Data_Calculation_Sheet_l0l316 IOSB Final Status Survey I I.Cl LC2 LC3 IDI LC6 1 I.CS f\CPM f1dpm Oate/lime of Count Sample Comments l F830 027 3 x 00001 SM Cell D-3 57 25 10/13/16 0944 2 F830 027 3 x 00002 SM Cell 0-3 5.1 11 10/13/16 0945 3 F830 027 3 x 00003 SM Cell 0*3 42 -9 10/13/16 0946 I\ F830 027 3 x 00004 SM Cell 0*3 53 16 10/13/16 0947 s FB30 OZ7 3 x oooos SM Ce!I 0-3 1\5 -3 lOi13/16 0949 G F830 027 3 x 00006 SM Cell 0-3 51 1l 10it3/1G 0950 7 F830 027 3 x 00007 SM Cell 0*3 44 -5 10/13/16 0951 8 F830 027 3 x 00008 SM Cell 0-3 52 14 10/13/1.6 0952 9 F830 027 3 x 00009 SM Cell 0-3 53 16 10/13/l.G 0953 10 F830 027 3 x 00010 SM Cell 0*3 56 23 10/13/16 0955 11 F830 027 3 x 00011 SM Cell D*3 45 -3 10/13/16 0956

12. fll30 027 3 x 00012 SM Cell D-3 43 -7 10/13/16 0957

,_13 Hl30 027 3 )( 00013 SM Cell D-3 41 -12 10/13/16 0958 11\ Fll30 027 3 x 00014 SM Cell D*3 46 () 10/13/16 0959 JS F830 027 3 x 00015 SM Cell 0-3 45 *3 10/13/16 1000 Comments Uy s.ip,n~1lu1'(* lx*lov.i. the ,.equired !>ourcc check ~inL1 h.1ckerouncl check!> wcrr. s;i1i~l~1r.torilyipr.'l*rormcd prior to use of the instrume111 id,~11tifiec1 helow.

Ludlum 2929 Bcnchtop Instrument t11~1:

(*ffo.:tt~ll(y l>kr. (QIJIH 2929 S/N: 182597 r.1v_* 11n,,., Mil/\

UDIV/O!

143-lCH S/N: 18873~

a 0.364 cpm min .:lpm p.'.*( :1r**~.i rcch /\Sign/ D~tc

~4--, /D/,.Jh{.

al Due Date: 5/13/2017 r.~ OA34 46.l 1 75.7 Tech B Sign/ Dale i-lt.'\ Cpm min dpsr: p1~( .lr(';l Page 3 Att. 4 Data Assessment f 8300273
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