ML17065A040

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Final Status Survey Report, October 21, 2016, Iosb Storage Cell B-1, Survey Unit F8300193
ML17065A040
Person / Time
Site: Rancho Seco
Issue date: 11/17/2016
From:
Sacramento Municipal Utility District (SMUD)
To:
Office of Nuclear Material Safety and Safeguards
Shared Package
ML17065A032 List:
References
DPG 17-038, F8300193
Download: ML17065A040 (16)
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Text

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Rancho Seco Final Status Survey Summary Report October 21, 2016 IOSB Storage Cell B-1 Survey Unit F8300193 Prepared By:_£__ ** _G_______ Date: JI. f

  • I to FSS Engineer Approved By: ~~~ Date:

. Manage;an:S:Co Assets

\

FINAL STATUS SURVEY F8300193 Survey Unit:

F8300193, Interim Onsite Storage Building (IOSB) Storage Cell B-1 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 2,071 dpm/100 cm 2 and a maximum value of 2,416 dpm/100 cm2

  • 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 B-1 F8300193

FINAL STATUS SURVEY F8300193 Table 1, Survey Unit Design Parameters i:yaluatio~ ~fo-~fotVatue~ .;,* _,,, .. "

  • toinm~nts*

Survey Package: F830 Storage Cell 8-1 Survev Unit: 019 Class 3 SU Area (m2) 23.1 Evaluator: JR DCGLw: 43,000 Gross Activity DCGL Area Factor N/A Class 3 Design DCGLemc (dpm/100cm 2 ): N/A Class 3 DCGLemc: N/A Class 3 LBGR: 21,500 Default= 50% DCGL Sigma: 177 Scoping Survey Data Type I error: 0.05 Type II error: 0.05 Predominant Nuclide Cs-137 Sample Area (m2) N/A Total Instrument Efficiency: 0.129 Total Area Scanned (m 2 ): 7.51 Scan Coverage(%) ,;::;i; -,;~::3%~:*' Class 3 Choosing 'N/A' sets material Material Tvoe: N/A background to "O"

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Z1-a: ': 1.64~.

Z1-a: *J."645 Sign p: 0:9"9865" Calculated Relative Shift:

  • 121'.4 Relative Shift Used: 3.0 Uses 3.0 if Relative Shift >3 N-Value: 11 N-Value+20%: 14 2 FSS Storage Cell B-1 F8300193

FINAL STATUS SURVEY F8300193 Survey Results:

A total of 15 direct measurements were made in F8300193. 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 Num~er ..

" ..Sam pl~.#::

pt"":"*,*,

Beta.(ppm) Beta (dpm) 1 F8300193X00001 225 1,744 2 F8300193X00002 238 1,845 3 F8300193X00003 247 1,915 4 F8300193X00004 242 1,876 5 F8300193X00005 227 1,760 6 F8300193X00006 236 1,829 7 F8300193X00007 254 1,969 8 F8300193X00008 246 1,907 9 F8300193X00009 224 1,736 10 F8300193X00010 208 1,612.

11 F8300193X00011 244 1,891 12 F8300193X00012 213 1,651 13 F8300193X00013 251 1,946 14 F8300193X00014 241 1,868 15 F8300193X00015 268 2,078 Table 3 contains the statistical summary of the static measurement data for the Storage Cell B-1.

Table 3, Beta Summary Statistics Beta Statics B-1 Mean 1,842 Median 1,868 Standard Deviation 123 Minimum 1,612 Maximum 2,078 Count 15 FSS Storage Cell B-1 F8300193

FINAL STATUS SURVEY F8300193 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: 1,868*

Mean: 1,842 Static Data Standard Deviation: 123.

Maximum: 2,078

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  • Adjusted N Value: 14.

S+ Value: * -1.5 Critical Value: i0

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Sufficient samples collected: Pass*

Maximum value <DCGLw: Pass'.

Median value <DCGLw: P'ass:

.'l Mean value <DCGLw:

  • Pass :

Maximum value <DCGLemc: N/A SiQn 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 Storage Cell B-1 F8300193

FINAL STATUS SURVEY F8300193

==

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 !Jlet 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 F8300193 meets the release criteria of 10CFR20.l402.

5 FSS Storage Cell B-1 F8300193

Attachment 1 Maps November 8, 2016 Survey Unit F8300193

,._I M IN 8-1 CH B-2 Q-2 6-3 3

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=: E-3 15 100Ct!!"'

fll300193 00005 4>

ri * !!CH ClDMI i 00 cm" F.S300193X.DOOO

  • - "4ol dpfl\*100 ~

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TIDEWATER IN SMUD

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Page 1 Att. I Maps F8300193

Attachment 2 Instrumentation September 23, 2016 Survey Unit F8300193

Table 2-1. Survey Unit Instrumentation Me~stirement

  • Mini rn unf.J)e~~~ta l:>Je Activity~:. :oet~c.tor (J~lil:>r~tion
  • type

' .1,,' *I* * ~: '! '.

Effi~ierlcies Due))ate~

Beta Static Ludlum Model Beta - 569 dpm/100 cm 2 12.9% 317899/331973 Measurement 2350-1 2/10117 Ludlum Model 44-1 16 B Detector Swipe Ludlum Model 2929 Alpha - 11 dpm/l 00 cm 2 36.9% 1667161170380 Measurements Ludlum Model 44- Beta - 80 dpm/100 cm 2 42.8% 11/3/16 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 F8300193

Static Measurement MDA Variables Beta Survey Type 331973 Detector Number 229 Background count rate (cpm) 1 Count Time (min) 0.129 Efficiency Area of Detector 100 (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

Background

Where: Br Countrate t Count Time (min)

E Efficiency Area of detector A (cm 2 )

Static MDA 569 dpm/100 cm2 Page 2 Att. 2 Instrumentation F8300193

Attachment 3 Investigation September 23, 2016 Survey Unit F8300193 (none required)

Att. 3 Investigation F8300193

Attachment 4 Data Assessment September 23, 2016 Survey Unit F830019

(Activity I Histogram for Beta Static Activity Storage Cell B-1 NllT'berofValues- 151 Minirnun 1.612.40 M"°""" 2.077.52 1 so 12333 Skewnes& -0.2!h KutosU -0.031 eJMe.an 1.841.86!

eJMedan 1.ooa.221 I ~Norma!OitbbJtir.n OLessBm I

I 0McreBN 1628 1721 1767 181' 1BEO 1907 1953 2047 2093 Page 1 Att. 4 Data Assessment F8300193

ActivQ

  • .!.*.. 2. Q-Q Plot for Beta Static Activity Storage Cell B-1 H *15 Mean*1B42 Sd* 123.3 Skipe*lV.4 lrtttc:1:P(
  • 1842 2040 . .

((JfdCJtior'l.R *0.9SS 1911) 1920

  • 1.5 *1.0 -0.5 0.0 05 1.0 1.5 Theoretical Quantiles (Standard Normal)

Page 2 Att. 4 Data Assessment : F8300193

Smear_Data_Calculation_Sheet_l01316 I IOSB Final Status SurveYi I LCl LC2 LC3 LC4 LC6 LCS ~ CPM 13 dpm Date/Time of Count Sample Comments I

l F830 019 3 x 00001 SM Cell B-1 59 20 08/31/16 10:04 2 F830 019 3 x 00002 SM Cell B-1 51 1 I 08/31/16 10:05 3 F830 019 3 x 00003 SM Cell B-1 43 -18 ' 08/31/16 10:06 4 F830 019 3 x 00004 SM Cell B-1 53 6 I 08/31/16 10:07

.,:) x SM Cell B-1 5 F830 019 00005 47 -8 i 08/31/16 10:09 6 F830 019 3 x 00006 SM Cell B-1 51 1 '

I 08/31/16 10:10 7 F830 019 3 x 00007 SM Cell 8-1 55 11 i

08/31/16 10:11 8 F830 019 3 x 00008 SM Cell B-1 57 15 I

08/31/16 10:12 9 F830 019 3 x 00009 SM Cell 8-1 52 4  : 08/31/16 10:13 10 F830 019 3 x 00010 SM Cell B-1 42 -20 ' 08/31/16

10
15 11 F830 019 3 x 00011 SM Cell B-1 43 -18 i 08/31/16 10:16 12 F830 019 3 x 00012 SM Cell B-1 38 -29 08/31/16 1.0:18 13 F830 Oi9 3 x 00013 SM Celi B-1 60 22 08/31/16 10:19 F830 019

-- x 00014 SM Cell B-1 '

14 3 53 6 08/31/16 10:20 15 F830 019 3 x 00015 SM Cell B-1 48 -6 08/31/16 10:21 Comments By signature below, the required source check and background checks were satisfaftorily performed prior to use of the instrument identified below.

Ludlum 2929 Benchtop Instrument t bkg etficiency bkg count 2929 S/N: 166716 rate time MDA 0.4 1 11.0 44-10-1 S/N: 170380 a 0.369 cpm min dpm per <ire~

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Tech A Sign/ Date~-, *e f;;; /(f; 80.2*

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-* Cal Due Date:;ll/3/2016 0.428 Tech B Sign/ Date pi {A ' cpm min dpm per area

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