ML17065A055

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Final Status Survey Summary Report, December 27, 2016, Iosb Cell Deck, Survey Unit F8300093
ML17065A055
Person / Time
Site: Rancho Seco
Issue date: 01/30/2017
From:
Sacramento Municipal Utility District (SMUD)
To:
Office of Nuclear Material Safety and Safeguards
Shared Package
ML17065A032 List:
References
DPG 17-038
Download: ML17065A055 (16)
v • d • e


Text

Rancho Seco Final Status Survey Sum*mary Report December 27, 2016 IOSB Cell Deck Survey Unit F8300093 FSS Engineer Lead FSS Engineer Approved By: ~Date:

Manage:RanhOS:COASsets

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FINAL STATUS SURVEY F8300093 Survey Unit:

F8300093, Interim Onsite Storage Building (IOSB) Cell Deck 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 walls and ceiling surfaces of the cell deck, to confirm the absence or presence of plant-derived radionuclides. Static measurements showed an average mean gross activity level of 2,079 dpm/l 00 cm2 and a maximum value of 2,607 dpm/l 00 cm2 for the walls and ceiling. 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 1% scan coverage. The instrumentation used for the survey along with the MDC values are listed in Table 2-1Attachment2.

FSS Cell Deck F8300093

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FINAL STATUS SURVEY F8300093 Table 1, Survey Unit Design Parameters

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Survey Packaqe: ,f830 Cell Deck Survey Unit: 009 Class 3 SU Area (m2) 460 Evaluator: JR DCGLw: 43,000 Gross Activity DCGL Area Factor N/A Class 3 Desiqn DCGLemc (dpm/100cm 2 ): N/A Class 3 DCGLemc: N/A Class 3 LBGR: 21,500 Default = 50% DCGL Siqma: 275 Scopinq Survey Data Type I error: 0.05 Tvoe II error: 0.05 Predominant Nuclide Cs-137 Sample Area (m2) N/A Total Instrument Efficiency: 0.132 Total Area Scanned (m 2): 5.55 Scan Coveraqe (%) ,*/. 1}>Jcl'" Class 3 Choosing 'N/A' sets material Material Tvoe: NIA backqround to "O"

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Z1-a: *1.645 Z1-ll: 1.645 Siqn p: 0.99865.

Calculated Relative Shift: 1a:1 Relative Shift Used: 3.0 Uses 3.0 if Relative Shift >3 N-Value: 11 N-Value+20%: 14 2 FSS Cell Deck f 8300093

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FINAL STATUS SURVEY F8300093 Survey Results:

A total of 15 direct measurements were made in F8300093. 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

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  • Number ,$arnpl~*#* . 'Beta (cpm)* *set~ (dprn)*
t,'

1 F8300093X00001 238 1,803 2 F8300093X00002 310 2,348 3 F8300093X00003 205 1,553 4 F8300093X00004 295 '" 2,235 5 F8300093X00005 270 2,045 6 F8300093X00006 288 2,182 7 F8300093X00007 307 2,326 8 F8300093X00008 284 2,152 9 F8300093X00009 250 1,894 10 F8300093X00010 258 1,955 11 F8300093X00011 269 2,038 12 F8300093X00012 211 1,598 13 F8300093X00013 247 1,871 14 F8300093X00014 254 1,924 15 F8300093X00015 235 1,780 Table 3 contains the statistical summary of the static measurement data for the Cell Deck.

Table 3, Beta Summary Statistics Beta Static Cell Deck Mean 1,980 Median 1,955 Standard Deviation 242 Minimum 1,553 Maximum 2,348 Count 15 3 FSS Cell Deck f 8300093

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FINAL STATUS SURVEY F8300093 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

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comm'ents Number of Samples: 15 Median: 1, 955 Mean: 1,980 Static Data Standard Deviation: . * *242 Maximum: 2, 3~8

  • Adjusted N Value: * -1.A S+ Value:
  • 15
  • Critical Value: * *10 Sufficient samples collected: Pass

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Maximum value <DCGLw: .Pass.*

Median value <DCGLw: Pass Mean value <DCGLw: Pas.s Maximum value <DCGLemc: N/A

  • Sign test results: P*ass
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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, based upon the adjustment of the relative shift, the calculated number of samples did not change. No potential areas of elevated activity were detected.

4 FSS Cell Deck f 8300093

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FINAL STATUS SURVEY F8300093

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 F8300093 meets the release criteria of 10CFR20.l402.

5 FSS Cell Deck f 8300093

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Attachment 1 Maps December 28, 2016 Survey Unit F8300093.

N FB300093X00003 @

13 =1 ,553 dpm/100 cm:i

  • F8300093X00012 $

13 = 1,598 .dpm/100 cm

. \1l 'F8300093X00004. . . . *

  • F8300093XQ0007

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13 2.2~5 dpm/100 cm 2 . . 13 = 2,326 dpin/100 cm~

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13 2;182 dp 100 cm2 F8300 93X00001 F !()()r [)eci*<*. @ @ =

13 1, 03 dpm/100 cm 2

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~**.-.:;.-."" F8300093XOO 09 r 'l~r~ f3 = 1 ,924 dpm 100 cm 2

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13 = 1 ,955 pm/100 cm 2 r1:-"'"'""

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f3 1 ,894 dp /100 cm 2

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13. 2, 152 dpm/100 cm2 F8300093X00011 $ @

f3 = 2,038 dpin/100 cm 2 F8300093X00005 F83~09JX00002 @ 8300093X()0013 13 = 2,045 dpm/100 cm2 j3 =2,348 dpm/100 cri'lz =1,871 dpm/100 cm 2

'SMUD W.3 TIDEWATER INC CELL DECK SMUD Approvod by.

F8300093X00015

~ =~,780 dpm/100 cm 2

Approval dote:

Fage 1 Att. 1 Maps F8300093

Attachment 2 Instrumentation December 27, 2016 Survey Unit F8300093

Table 2-1. Survey Unit Instrumentation Beta Static Ludlum Model Beta - 543 dpm/I 00 cm 2 132% 317897/33 I 972 Measurement 2350-1 2110117 Ludlum Model 44-116 B Detector Swipe Ludlum Model 2929 Beta - 79 dpm/ 100 cm 2 43.4% I 82597 /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 Page 1 Att. 2 Instrumentation F8300093

Static Measurement MDA Variables Beta Survey Type PR331972 Detector Number 218 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 (cm 2)

Static MDA 543 dpm/100 cm2 Page 2 Att. 2 Instrumentation F8300093

Attachment 3 Investigation December 27, 2016 Survey Unit F8300093 (none required)

Att. 3 Investigation F8300093

Attachment 4 Data Assessment December 27, 2016 Survey Unit F8300093

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Histogram for Beta Static Activity (dpm/100cm2) Cell Deck Nll'l"befol VoLes 15

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1 ~53.03 1 2,3'8.48 SD 242.03 s........ .n1*

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Katcmt -0.67

{i')Mean 1.900.'Xl BModon 1.9154.55 G:]No11nalOittri:iufun 0Lett 8n; OMoitB l'lf 1591 1670 1750 18Xl 1909 1!119 2068 2148 I_

Page 1 Att. 4 Data Assessment F8300093

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

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  • O.SS 2200 1800 1£0l
  • 1.5 *1.0 -0.5 0.0 n5 1.0 1.5 Theoretical Quantiles (Standard Nonna!)

Page2 Att. 4 Data Assessment f 8300093

Smear_Oat;i_Calculation_Shee\_ 101316 I IOSB Final Status Survey I LCl LC2 LC3 LCll f.(6 LCS f\CPM fldpm Date/Time of Count Sample Comments l F830 009 3 c 00001 SM Cell Deck 42 -18 10/12/16 1048 2 FS30 009 3 c 00002 SM Cd\ Deck 37 -29 10/12/16 1018 3 FB30 009 3 c 00003 SM Cell D*~clc 46 -9 10/12/16 0958 4 F830 009 3 ( 00004 SM Cell Deck 51 3 10/12/16 1042 5 FS30 009 3 c 00005 SM Cell Deck 43 -4 10/12/16 1008 6 FSJO 009 3 c 00006 SM Cell Deck 49 -2 10/12/16 0950 7 F830 009 3 c 00007 SM c.~11 Deck 62 28 10/12/16 1039 8 F830 009 3 c 00008 SM Cell Deck 49 -2 10/12/06 1033 9 F830 009 3 c 00009 SM Cell Deck 43 -16 10/12/16 1007 10 Fi:\30 009 3 c 00010 SM Cell Deck 53 7 10/12/16 1045 11 Fi:!30 009 3 c 00011 SM C*~ll Deck 51 3 10/12/16 1025 12 F830 009 3 c 00012 $(\!I Cell Deck 35 -34 10/12/16 1004 13 F830 009 J c 00013 SM Cell Deck 53 19 10/12/16 1030

--14 F830 009 3 c 00014 SM

-- Cell Deck 37 -29 10/12/16 101.6.

15 F830 009 3 c 00015 5M Cell Deck 42 -18 10/12/16 0957 Comments Oy :.i1~n:lll*f*? b>.:>io\'"* lh*.:* t*:-*q11i1(*ct -.t)t.1rf" o:ht:*d: ,'JJ"KI IJ,,:::l:f:icund 1:h(:d~:. wt;'fe -;;:11i:.l;1c10tily pc1lorm<!d t,.\f't"r (I) U~ Ol lht* if't~tfumCrl\ ideoliiit.:!d bt4ow.

Ludlum 2929 Benchtop Instrument tkr.

cflic:iC'n*:v bkf, count 2929 S/N: 182597 rate 1im:;- MOA HDIV/0!

Ct. 0.364 113-10-1S/N:188736 cprn min dpin 1}(~ ilfC.)

Tech A Sign/ D<1te . ; /!--;,. -1 "Jt/jfjlJ IZ.-7.- lfo 49.8 l 78.6 Cal Due Date: 5/13/2017 f.) OA34 Tech B Sign/ Date rJ I.~ qun rni1~ dpm PPf ;irc:i Page 3 Att. 4 Data Assessment F8300093

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