ML17065A059

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Final Status Survey Summary Report, January 6, 2017, Iosb DAW Staging Bay Class 2, Survey Unit F8300042
ML17065A059
Person / Time
Site: Rancho Seco
Issue date: 01/10/2017
From:
Sacramento Municipal Utility District (SMUD)
To:
Office of Nuclear Material Safety and Safeguards
Shared Package
ML17065A032 List:
References
DPG 17-038
Download: ML17065A059 (15)
v • d • e


Text

Approved By: :(! Rancho Seco Final Status Survey Summary Report January 6, 2017 IOSB DAW Staging 'Bay Class 2 Survey Unit F8300042 I . I I Date* 1 fto/17 Seco Assets *-----

FINAL ST ATVS SURVEY F8300042 Survey Unit: F8300042, Interim Onsite Storage Building (IOSB) DAW Staging Bay Class 2 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 (ALAR.A.), the IOSB contained and possibly stored media of many types, including filters, resins, contaminated chemicals, DAW, activated reactor components, contaminated plant components and other contaminated items. Site Characterization:

Based upon the scanning results of the DAW Staging Bay two elevated areas were identified on the floor. One of these areas exceeded the DCGLw but not the DCGLEMC* This area required remediation.

The other area did not exceed the DCGLw. The* DAW Staging bay was divided into a small Class 1 Survey Unit, buffered by a Class 2 Survey Unit. Survey Unit-Design lnformatio-ri:

In accordance.

with MARSSIM Section 4.6, special considerations may be necessary for survey units with structure surface areas less than 10 m 2 or land areas less than 100 m 2* In this case, the number of data points obtained from the statistical tests is unnecessarily large and not appropriate for smaller survey unit areas. The data generated from these smaller survey units should be obtained based on judgment, rather than on systematic or random design, and compared individually to the DCGLs. This survey unit meets this criterion as the size is less than ten square meters (2.22 m 2). 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 100% of the area scanned. The instrumentation used for the survey along with the MDC values are listed in Table 2-1 Attachment
2. FSS DAW Staging Class 2 F8300042 FINAL STATUS SURVEY F8300042 Table 1, Survey Unit Design Parameters "r.i.,\.:

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,
*.*: *:, .. ::,; * ":*_,;-* 2 Survey PackaQe: F830
  • DAW Staqinq Bay Class 2 Survey Unit: 004 Class 2 SU Area (m 2) 2 Evaluator:

JR DCGLw: 43,000 Gross Activitv DCGL Area Factor 5 DTBD-05-003 for 4 m 2 Design DCGLemc (dpml100cm 2): 215,860 DCGLemc: 215,860 LBGR: 21,500 Default= 50% DCGL SiQma: 598 ScopinQ Survey Data Type I error: **_

Type II error: 0.05 Predominant Nuclide Cs-137 Sample Area (m2) NIA Total Instrument Efficiency:

0.132 From 10126116 Survey -

. -*--Total Area Scanned (m 2): 2.22 Scan Coveraqe (%)

Class 2 Material Type: Choosing 'NIA' sets material NIA background to "O" Calculated Relative Shift: * *. *.:

.. Relative Shift Used: N-Value: N-Value+20%:

  • ib Uses 3.0 if Relative Shift >3 -* :*w*, Values selected based upon *. *10.' Judqement
  • _; Values selected based upon 10' Judgement FSS DAW Staging Bay Class 2 F8300042 FINAL STATUS SURVEY F8300042 Survey Results: A total of 10 direct measurements were made in F8300042.

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 *t' ;, * . . *' ,* .... " ..

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'. .. . . *' *' 1 F8300042C00001 300 2,326 2 F8300042C00002 300 2,326 3 F8300042C00003 280 2,171 4 F8300042C00004 304 2,357 5 F8300042C00005 269 2,085 6 F8300042C00006 281 2,178 7 F8300042C00007 261 2,023 8 F 8300042C00008 296 2,295 9 F8300042C00009 287 2,225 10 F8300042C00010 294 2,279 Table 3 contains the statistical summary of the static measurement data for the DAW Staging Bay Class 2.

  • Table 3, Beta Summary Statistics Beta Static DAW Staging Bay Class 2 Mean Median Standard Deviation Minimum Maximum Count Survey Unit Data Assessment:

2,226 2,252 111 2,023 2,357 10 The survey design required 10 static measurements based upon the size of the survey unit (2.22 m 2). Following the guidance in MARSSIM Section 4.6, these values are compared directly to the DCGLw. The comparison and the results are presented in Table 4. The sample mean and median values were less than the DCGL. .... .) FSS DAW Staging Bay Class 2 f 8300042 ---**---=-**-

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FINAL STATUS SURVEY F8300042 Table 4, Data Assessment Results . .,.. .: * *:.* ;.: . static Data Values*.*

Number of Samples: 10 Median: 2,252 Mean: Static Data Standard Deviation:

Maximum: 2,357: Sufficient samples collected:

Pass Maximum value <DCGLw: Pass. Median value <DCGLw:

  • Pass. Mean value <DCGLw:

Maximum value <DCGLemc:

Pass Sign test results: . NIA-

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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 2 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, no individual measurement exceeded the DCGL. 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 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 F8300042 meets the release criteria of I OCFR20.1402.

4 FSS DAW Staging Bay Class 2 f 8300042 Attachment 1 Maps January 6, 2017 Survey Unit F8300042 SMUD .a TIDEWA T ER I NC " "

STAGING BAY CLASS 2 SMUD A,Prowol do t e: Page I {+/-) F8300042C00007 13 = 2 , 023 dprn/100 cm 2 (£} F8300042C00005 13 = 2.085 dpm/100 cm 2 (£} F830004r2C00010 F8300042C00009

(£} 13 = 2 , 225 dpm/100 cm 2 + {+/-) F830004 2C 0000 3 13 = 2 171 dpm 100 cm 2 F830 4 2 C00006 13 = 2, 178 dpm 1 100 cm 2 13 = 2 , 27 dpm/100 cm' (+/-} F8 00042C00002 13 ::; 2 , 326 dpm/100 cm i (£} F8300042C 004 13 =2 , 357 dpm 100 cm z (+/-> F83DQ042C0 0008 13 = 2,(295 dpm'1 00 cm 2 (f} F8300042C00001 13 = 2 , 326 dpm/100 cm 2 _J Att. 1 Maps F8300042 Attachment 2 Instrumentation January 6, 2017 Survey Unit F8300042 Table 2-1. Survey Unit Instrumentation ,

1;¢ment * ,-rn.*,st,

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  • * ... ,,, _ *" J,j:ffieieodes , Beta Static Measurement Swipe Measurements Ludlum Model 2350-l Ludlum Model 44-1 16 B Detector Ludlum Model 2929 Ludlum Model 44-10-1 Beta -424 dpm/100 cm 2 12.9% Beta -78 dpm/100 cm 2 43.4% ,*

.. , : , 317899/331973 2110/17 I 825971188736 5/13/17

  • Minimum detectable activities for the count rate instrumentaiion 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 8300042 Static Measurement MDA Beta Survey Type PR331973 Detector Number 143 Background count rate (cpm) 1 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)05/t
  • E
  • A/100 (NUREG 1507) Where: Br .Background C.ountrate.

t Count Time (min)

  • E Efficiency A Area of detector (cm 2) Static MDA 454 dpm/100 cm 2 Page 2 Att. 2 Instrumentation f 8300042 Att. 3 Investigation Attachment 3 Investigation January 6, 2017 Survey Unit F8300042 (none required) f 8300042 Attachment 4 Data Assessment January 6, 2017 Survey Unit F8300042 Histogram for Beta Static Activity (dpm/100 cm2) DAW Staging Bay C!ass 2 / 2033 :noo "133 "167 2200 Page 1 Att. 4 Data Assessment F8300042 A c tidy Minirno.m

_.,.,,,,, S D Skewne:ts Ki.riolit 0Mean 0Mod.n 1 8 N 1J1m.-:il DisltOJion QL el:Biu OMoreDN 10 , 2 ,02126 2.356.59* 110.SSi -0.70 -0.ss'

' ( .... Q-Q Plot for Beta Static Activity (dpm/100 cm2) DAW Staging Bay Class 2 *1.5 *1.0 -0.5 no Theoretical Quantiles

,0.5 *I Page 2 Att. 4 Data Assessment 1.0 1.5 f 8300042 ActiylJo 10 MeM*2226 Sd*11Q9 Slope*1U.l lntcrtepl.*2226 CoockiOOn.

A

  • O 9&7 S111ear _Data_Calcula1ion_Shee1_101316 IOSB Final Status Survey ' : LCl LC2 LC3 LC4 LC6 LCS (JCPM fldpm Date/Time of Count Sample Comments 1 F830 004 2 c 00001 SM Stogc Bny Fir Bu!fr* l 11/29/16 1056 2 FS30 2 c ooooz SM Stage Boy Fir Buffr 40 -20 i 1/29/16 1057 3 F830 004 2 c 00003 SM Stage Clay Fir Bulfr 45 -8 11/29/16 1058 4 F830 004 2 c 00004 SM Stage Clay Fir Buffr 45 -8 ii/29/16 l"JOO s F830 2 c 00005 SM Stace BJy Fir Buflr 42 *15 11/29/lG 1101 6 Fl\30 004 ). c 00006 SM Stage Bav Fir Buffr 43 -13 11/29/16 Jl02 7 F830 00.4 2 c 00007 SM Sl*B<> Bay Fir Burfr 45 *S 11/29/16 1J04 8 F830 004 2 c 00008 SM Stage Bay Fir Buffr 43 -13 ll/29/16 1105 9 F830 004 2 c 00009 SM Bay Fir Burrr 51 6 11/29/16 1.106 10 F830 004 2 c 00010 SM Stage Bay Fir Oufli 34 *33 il/29/16 JlOH .11 HOO 004 2 c 00011 SM S!Jgc £l.1y Fir IJuffr :::><::: =:><::: :::::::><::::

-:::>< 12 F830 (1<)4 2 ( 00011 SM S1ae.e Bay Fir lluflr >< >< "'><' 13 F830 004 2 c 00013 SM St ago llay Fir lluffr ><:.:::: 14 F830 004 2 c 00014 SM Stage Bay Fir lluflr -.:><:::::-"'><' 15 F830 004 2 c 00015 SM Staee Fir Borfr .=><: >< """>< Comments Ry 1'f!Quiri-nt idcnlllicd tx:tow. ' Ludlum 2929 Benchtop Instrument i !;l!q: <*ff*cic11-;v hkc count 2929 S/N: 182597 ' rtne Mil/\ 0.36'1 ffOIV/01 a 43-10-1S/N:188736 cp111 111i11 Tech A Sign/ Date(}" 1fAA;, // 1-7. -//, Cal Due Date: 5/13/?017 48.S l 77.6 f3 Tech I.I Sign/ l);:ite/ t-l-1 /:-. cpm min d11m a11*;;i Page 3 Att. 4 Data Assessment F8300042

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