ML17065A049

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Final Status Survey Summary Report, December 1, 2016, Iosb Storage Cell E-2, Survey Unit F8300293
ML17065A049
Person / Time
Site: Rancho Seco
Issue date: 12/14/2016
From:
Sacramento Municipal Utility District (SMUD)
To:
Office of Nuclear Material Safety and Safeguards
Shared Package
ML17065A032 List:
References
DPG 17-038
Download: ML17065A049 (16)
v • d • e


Text

Rancho Seco Final Status Survey Summary Report December 1, 2016 IOSB Storage Cell E-2 Survey Unit F830029.3 FSS Engineer Approved By:.* d'->.~ Date: 1:2-/N /11.,

Manager, Rancho Seco Assets

FINAL STATUS SURVEY F8300293 Survey Unit:

F8300293, Interim Onsite Storage Building (IOSB) Storage Cell E-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 (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 3,095 dpm/l 00 cm2 and a maximum value of 3,565 dpm/l 00 cm2* Based on the levels of gross activity reported, the area was determined to be a Class 3 area.

Survey Unit Desigrf lnf<>rmati<>n:

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.

FSS Storage Cell ~-2 f 8300293

FINAL STATUS SURVEY F8300293 Table 1, Survey Unit Design Parameters Survey Package:

F830 Storage Cell E-2 Survey Unit:

029 Class 3

SU Area (m2) 28 Evaluator:

JR DCGLw:

43,000 Gross Activity DCGL Area Factor NIA Class 3 Desiqn DCGLemc (dpm/100cm2):

N/A Class 3 DCGLemc:

NIA Class 3 LBGR:

21,500 Default = 50% DCGL Sigma:

197 Scoping Survey Data Type I error:

6.os Type II error:

0.05 Predominant Nuclide Cs-137 Sample Area (m2)

N/A Total Instrument Efficiency:

0.129 Total Area Scanned (m2):

7.51 Scan Coverage (%) '. :.. '.*:,ii0/t'. Class 3 Choosing 'N/A' sets material Material Type:

N/A backqround to "O"

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*
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Z1-a:

1.645 Z1-a:

1.. 645 Siqn o:

0.99865 Calculated Relative Shift:

109.1 Relative Shift Used:

. 3"0 Uses 3.0 if Relative Shift >3 N-Value:

11 N-Value+20%:

14 2

FSS Storage Cell E-2 F8300293

FINAL STATUS SURVEY F8300293 Survey Results:

A total of 15 direct measurements were made in F8300293. 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

      • .*sc:imp1e#

Beta (cpm).

Beta (dpm) 1 F8300293X00001 298 2,258 2 F8300293X00002 269 2,038 3 F8300293X00003 233 1,765 4 F8300293X00004 249 1,886 5 F8300293X00005 282 2,136 6 F8300293X00006 220 1,667 7 F8300293X00007 283 2,144 8 F8300293X00008 250 1,894 9 F8300293X00009 307 2,326 10 F8300293X00010 275 2,083 11 F8300293X00011 278 2,106 12 F8300293X00012 277 2,098 13 F8300293X00013 267 2,023 14 F8300293X00014 289 2,189 15 F8300293X00015 253 1,917 Table 3 contains the statistical summary of the static measurement data for the Storage Cell E-2 3

Table 3, Beta Summary Statistics Mean Median Beta Static E-2 Standard Deviation Minimum Maximum Count FSS Storage Cell E-2 2,035 2,083 180 1,667 2,326 15 f 8300293

FINAL STATUS SURVEY F8300293 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

.static. oata Yahi~s * *..

  • Co:mments Number of Samples:

15 Median:

2,083 Mean:

2,035 Static Data Standard Deviation:

180 Maximum:

2,326 Adjusted N Value:

14 S+ Value:

15 Critical Value:

10

  • *
  • CQ!Tfrrie.nt$.
  • Sufficient samples collected:

Pass Maximum value <DCGLw:

  • Pass Median value <DCGLw:

Pass Mean value <DCGLw:

Pass Maximum value <DCGLemc:

. N/A SiQn test results:

Pass "1

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 Storage Cell E-2 f 8300293

FINAL STATUS SURVEY F8300293

==

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 f 8300293 meets the release criteria of 10CFR20.I402.

5 FSS Storage Cell E-2 f 8300293 Maps December 1, 2016 Survey Unit F8300293

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C ~ !

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  • 2.lr-3 dpm/100 1*

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I - :! 1.

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l - 2 '()(* pm/1()1) CJ"'

Att. I Maps

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F8300293 Instrumentation December 1, 2016 Survey Unit F8300293

Measureiuept

'Type Beta Static Measurement Swipe Measurements Table 2-1. Survey Unit Instrumentation

[nstrum,ent Type Ludlum Model 2350-1 Ludlum Model 44-1 I 6 B Detector Ludlum Model 2929 Ludlum Model 44-10-1 Minimum Detectable Activity" Beta - 704 dpm/I 00 cm2 Alpha - 3 dpm/100 cm2 Beta - 76 dpm/100 cm2 Detector Efficiencies 13,2%

36.9%

42.8%

Calibration

, Dµe,:oat~b 317897/331972 2/10/17 166716/170380 11/3/16

  • 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.

cm2 = square centimeters cpm =counts per minute dpm = disintegrations per minute Page 1 Att. 2 Instrumentation f 8300293

Static Measurement MDA Variables Beta Survey Type PR331972 Detector Number 374 Background count rate (cpm)

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:

Static MDA Page 2 Br t

E A

Background Countrate Count Time (min)

Efficiency Area of detector (cm 2) 704 dpm/100 cm2 Att. 2 Instrumentation f 8300293

Att. 3 Investigation Investigation October 11, 2016 Survey Unit F8300293 (none required) f 8300293 Data Assessment December 1, 2016 Survey Unit F8300293

Histogram for Beta Static Activity E-2 171' 1700 18'5 1911 2043 2109 Page I Att. 4 Data Assessment 2175 2.W F8300293 Activq NUTbff dV~

MtiPun so OLen Bn:

0Mae 8m

, I

Q..Q Plot for Beta Static Activity E*2

  • 1.5
  • 1.0 M

Theoretical Quantiles (standard Nonna!)

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10/05/16 11:15 Coin men ls 13*1 :.i,~11.1turc.o below, the n:qui1cri ~ourCI'.! check and badr,rou11d r.heckr. wl!r(' satisfoctOfilv peiformr.d plior to ust~ of thci insuu111cn1 /rjt,!ntUk*d lJL"luw.

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