ML17065A056

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Final Status Survey Summary Report, December 28, 2016, Iosb DAW Staging Bay, Survey Unit F8300023
ML17065A056
Person / Time
Site: Rancho Seco
Issue date: 01/24/2017
From:
Sacramento Municipal Utility District (SMUD)
To:
Office of Nuclear Material Safety and Safeguards
Shared Package
ML17065A032 List:
References
DPG 17-038
Download: ML17065A056 (17)
v • d • e


Text

Rancho Seco Final Status Survey Summary Report December 28, 2016 IOSB DAW Staging Bay Survey Unit F8300023 FSS Engineer Approved By: ,,/){L~ ~,/iL~ Date:_'~-~-'7 Manager,: Z : e c o Assets

FINAL STATUS SURVEY F8300023 Survey Unit:

F8300023, Interim Onsite Storage Building (IOSB) DAW Staging Bay 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: Static measurements were made of the interior surfaces of the DAW Staging Bay to confirm the absence or presence of plant-derived radionuclides.

Static measurements showed a mean gross beta activity level of 2,637 dpm/100 cm2 and a maximum value of 4,505 dpm/100 cm2

  • The statistics of the DAW Staging bay results combines all lower walls, upper walls, floor, and ceiling data. Based upon the scanning results 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. The remainder of the Bay was designated as a Class 3 Survey Unit and is the subject of this report.

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 3% of the area scanned. The instrumentation used for the survey along with the MDC values are listed in Table 2-1 .

FSS DAW Staging f 8300023

FINAL STATUS SURVEY F8300023 Table 1, Survey Unit Design Parameters

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Survey Packaqe: F830 DAW Staqinq Bay Survey Unit: 002 Class 3 SU Area (m 2) 248 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: 598 Scopinq Survey Data Type I error: 0.05 Type II error: 0.05 Predominant Nuclide Cs-137 Sampl~ Area (m2) N/A Total Instrument' Efficiency: 0.132 From 10/26/16 Survey Total Area Scanned (m 2): 5.55 Scan Coveraqe (%) . >t;;{~b/cif. Class 3 Choosing 'N/A' sets material Material Type: N/A background to "O"

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Z1-a: 1.. 645 Z1-13:  : 1.645 Sign p: 0.99865 Calculated Relative Shift: 35.9 Relative Shift Used: 3.0 Uses 3.0 if Relative Shift >3 N-Value: 11 N-Value+20%: 14 2 FSS DAW Staging Bay f 8300023

FINAL STATUS SURVEY F8300023 Survey ,Results:

A total of 15 direct measurements were made in F8300023. The results of the static measurements are shown in Table 2. All of the static measurements were Jess 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:*.**

.... * &ample#** eeta (cpill) Beta (dPllJ)*

  • 1 F8300023C00001 215 1,629 2 F8300023C00002 274 2,076 3 F8300023C00003 263 1,992 4 F8300023C00004 229 1,735 5 F8300023C00005 294 2,279 6 F8300023C00006 261 1,977 7 F8300023C00007 264 2,000 8 F8300023C00008 234 1,773 9 F8300023C00009 382 2,961 10 F8300023C00010 243 1,884 11 F8300023C00011 276 2,091 12 F8300023C00012 310 2,348 13 F8300023C00013 275 2,083 14 F8300023C00014 284 2,152 15 F8300023C00015 233 1,765 Table 3 contains the statistical summary of the static measurement data for the DAW Staging Bay.

Table 3, Beta Summary Statistics Beta Static DAW Staging Bay Mean 2,050 Median 2,000 Standard Deviation 323 Minimum 1,629 Maximum 2,961 Count 15 3 FSS DAW Staging Bay f 8300023

FINAL STATUS SURVEY F8300023 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 Number of Samples: 15 Median: 2,000 Mean: 2,050 Static Data Standard Deviation: 323 Maximum: 2,961 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 less than the characterization data used for survey design. No potential areas of elevated activity were detected.

4 FSS DAW Staging Bay f 8300023

FINAL STATUS SURVEY F8300023

==

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 F8300023 meets the release criteria of 1OCFR20.1402.

5 FSS DAW Staging Bay F8300023*

Attachment 1 Maps December 28, 2016 Survey Unit F8300023

e F83Q0023C00006 J3 =1,977 dpm/100 cm 2 F8300023C00011 6' J3 = 2,091dprn/100 cm 2 FB300023C000041B *

) Doc r~o Tru ~ Bay 13= 1,73.5 dpm/100 cm 2 F8300023C000106' FB300023C.00001 e 13 =1,884 dpm/100 cm 2 J3 = 1,629 dpm/100 cm 2 F830Q023C000159

~ = 1,765 dpm/100 crh 2 F83o0023C00009

  • J3 = 2,961 dpm/100 cm*

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. J3 ; 2,083 dpm/1 OQ crri 2 ITTl LhJJ F8300042 F8300031 (inner)

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13 2, 15.2 dpm/100 cm 2

  • e F83Q0023C00008 e F8300023C00007 6' J3 = 1, 773 dpm/100 cm 2 F8300023C00005 6' J3 = 2,000 dpm/100 cm 2 J3 = 2,279 dpm/100 cm 2 F8300023C00003 e.

J3 = 1,992 dpm/'100 cm 2 Door to DAV\ Bay

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F8300023C00002ED J3 = 2,076 dpm/100 cm 2 STAGING BAY tract No.: 4500091426 SMUD e F8300023C00012 Locotlon: P.ancho Seco ApproYOd by.

Tcsk:

Orowlng No.:

Scnnin.a Survev rose SconinR SurvPV J3 = 2,348 dpm/100 cm 2 OescrlDUon: DAW NORTH WALL 0 10 20 Drown av. c Gr-"V QC'ct. J Reese AP!>"'vcl date:

5cale Infect Dato: ll282016 Rav No.:

Page 1 Att. 1 Maps F8300023

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Attachment 2 Instrumentation December 28, 2016 Survey Unit F8300023

Table 2-1. Survey Unit Instrumentation M~i~s1Jr*~~~e1it IYJ.inimuri1 D.~_tectable Actlvit);. < Detectoi;. (;alib*r~ti~u *

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Beta Static Ludlum Model Beta - 492 dpm/l 00 cm 2 12.9% 317899/331973 Measurement 2350-1 2/10/17 Ludlum Model 44-116 B Detector Beta Static Ludlum Model Beta - 559 dpm/l 00 cm 2 13.2% 317897/331972 Measurement 2350-1 2110117 Ludlum Model 44-1 I 6 B Detector Swipe Ludlum Model 2929 Beta - 73 dpm/100 cm 2 43.4% 182597/188736 Measurements Ludlum Model 44- Beta- 75 dpm/100 cm 2 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 I 2 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 f 8300023

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Static Measurement MDA Variables Beta Survey Type PR331973 Detector Number 169 Background count rate (cpm)

Count Time (min) 0.12 9 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 492 dpm/100 cm 2 Page 2 Att. 2 Instrumentation f 8300023

Static Measurement MDA Variables Beta Survey Type PR331972 Detector Number 232 Background count rate (cpm)

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 (cm 2)

Static MDA 559 dpm/100 cm 2 Page 3 Att. 2 Instrumentation f 8300023

Attachment 3 Investigation December 28, 2016 Survey Unit F8300023 (none required)

Att. 3 Investigation f 8300023

Attachment 4 Data Assessment December 28, 2016 Survey Unit F8300023

Histogram for Beta Static Activity (dpmf100 cm2) DAW Staging Bay Activiy I Nt.rilerolVM.iei 1S MirWIUTI 1..628.79!

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Q-Q Plot for Beta Static Activity (dpm/100 cm2) DAW Staging Bay Activl) r:*** tl*l5 Mean~2050 Sd*322.8 5~*'312.8 lrtci~*2C&r Coudaticn. A

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P~g~ 1uf1 Page 3 Att. 4 Data Assessment F8300023

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