ML17065A037

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Final Status Survey Report, October 20, 2016, Iosb Storage Cell A-3, Survey Unit F8300183
ML17065A037
Person / Time
Site: Rancho Seco
Issue date: 12/30/2016
From:
Sacramento Municipal Utility District (SMUD)
To:
Office of Nuclear Material Safety and Safeguards
Shared Package
ML17065A032 List:
References
DPG 17-038, F8300183
Download: ML17065A037 (16)
v • d • e


Text

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Rancho Seco Final Status Survey Summary Report October 20, 2016 IOSB Storage Cell A-3 Survey Unit F8300183 Prepared By: £~ cl FSS Engineer Date: 11.' llR. (~

ReviewedBy:~ Date: !k*/b-/1.

Lead FSS Engineer

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FINAL STATUS SURVEY F8300183 Survey Unit:

F8300183, Interim Onsite Storage Building (IOSB) Storage Cell A-3 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 beta activity level of 2,020 dpm/100 cm 2 and a maximum value of 2,382 dpm/100 cm 2

  • Based on the levels of gross activity reported, the area was determined to be a Class 3 area.

Survey Unit o-esign 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 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 A-3 F8300183

FINAL STATUS SURVEY F8300183 Table 1, Survey Unit Design Parameters

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Survey Packaqe: F830 Storaqe Cell A-3 Survey Unit: 18 Class 03 SU Area (m2) 28 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: 175 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 (m2): 7.51 Scan Coverage(%) *;.: <§,2~?b';i Class 3 Choosing 'N/A' sets material Material Tvoe: N/A background to "O" Z1-a: 1.645 Z1-13: 1.64'5 Sign p: 0.9.9!365

  • Calculated Relative Shift: 122.8 Relative Shift Used: 3.0 Uses 3.0 if Relative Shift >3 N-Value: 11 N-Value+20%: 14.

2 FSS Storage Cell A-3 F8300183

FINAL ST ATVS SURVEY F8300183 Survey Results:

A total of 15 direct measurements were made in F8300183. 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 ~hove the MDA.

Table 2, Static Measurement Results Number . .sa111p1e #

  • Beta (cpil;1} B.eta.(dpm) 1 F8300183XOOQ01 270 2,045 2 F8300183X00002 267 2,023 3 F8300183X00003 283 2,144 4 F8300183X00004 274 2,076 5 F8300183X00005 286 2,167 6 F8300183X00006 250 1,894 7 F8300183X00007 264 2,000

.. 8 F8.300183XO_Q008 246 1,864 9 F8300183X00009 265 2,008 10 F8300183X00010 272 2,061 11 F8300183X00011 269 2,038 12 F8300183X00012 273 2,068 13 F8300183X00013 263 1,992 14 F8300183X00014 254 1,924 15 F8300183X00015 248 1,879 Table 3 contains the statistical summary of the static measurement data for the Storage Cell A-3.

Table 3, Beta Summary Statistics Beta Static A-3 Mean 2,012 Median 2,023 Standard Deviation 91 Minimum 1,864 Maximum 2,167 Count 15 3 FSS Storage Cell A-3 F8300183

FINAL STATUS SURVEY F8300183 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: 2,023 Mean: 2,012.

Static Data Standard Deviation: * **9*1

  • Maximum: 2, 167

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Adjusted N Value:

  • 14
  • S+ Value: ...15 .

Critical Value:

  • 10 ..
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Sufficient samples collected: Pass Maximum value <DCGLw: *Pass Median value <DCGLw: Pass:

Mean value <DCGLw: Pass Maximum value <DCGLemc: . 1 N/A Sic:rn test re$ults: P~ss

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The survev 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 which would result in a larger relative shift value. Since both values are in excess of 3 the difference in the variability does not affect the power of the survey. No potential areas of elevated activity were detected.

4 FSS Storage Cell A-3 F8300183

FINAL STATUS SURVEY F8300183

==

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 F8300183 meets the release criteria of 10CFR20.l402.

5 FSS Storage Cell A-3 F8300183

Attachment 1 Maps December 20, 2016 Survey Unit F8300183

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SMUDI TIDEWATER INC FS30018JX 1 RA.l' OO:t. .t.L St.JtVICC.~

~ . 199 * ~11l{l()Cf¢n' INTI!:l'llM ONSITI!: STOftAGI!: BUILDING (1056) troct No.; * "'4...:tlt'; l<'llf: SMUD f.83001~XOOO $

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r. = 2 167 t1nm1100 cm' Pagel Att. 1 Maps F8300183

Attachment 2 Instrumentation December 20, 2016 Survey Unit F8300183

Table 2-1. Survey Unit Instrumentation Me~sur~frient Minimum* Detectable Activity? :D~~ector Calibratio~.

lnstium,en t ,J?.ype Type :.

  • Effic.iencies *oue .Dat~~*

Beta Static Ludlum Model Beta - 550 dpm/l 00 cm 2 13.2% 317897/331972 Measurement 2350-1 2/10/17 Ludlum Model 44-116 B Detector Swipe Ludlum Model 2929 Beta- 76 dpm/l 00 cm 2 42.8% 166716/170380 Measurements Ludlum Model 44- 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 dprn =disintegrations per minute Page 1 Att. 2 Instrumentation F8300183

Static Measurement MDA Variables Beta Survey Type PR331972 Detector Number 224 Background count rate (cpm) 1 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 550 dpm/100 cm2 Page 2 Att. 2 Instrumentation

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Attachment 3 Investigation October 20, 2016 Survey Unit F8300183 (none required)

Att,] Jny~stigation ___ ____ _ _. _ -..£83.00.].83 _~- --

  • Attachment 4 Data Assessment December 20, 2016 Survey Unit F8300183

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Histogram for Beta Static Activity Storage Cell A-3 ,Acl iv i(y

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Numbc1ol lialue1 MJWnun Masi-run SD l.B&3.64:

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Skewne."rJ -0.16 Ku-to~it -0.56j BMoon 2.01212(

B M...a.n 2.022.731 Gj~iormalDi~rb.Jtion

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1894 1932 1970 2045 2121 2159 Page 1 Att. 4 Data Assessment F8300183

Q-Q Plot for Beta Static Activity Cell A-3 Activl]I n .15 Meanc2012 Sd*00.54 Slope*92.9f.I

'2150 lrVe1~*2012 Cone!aticio, R ~ 0.981 2100 2050 1950 1900

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

Page 2 Att. 4 Data Assessment F8300183

Smear _Da1a_Calcula1ion_Sheet_101316 IOSB Final Status Survey LC.1 LC2 LC3 LC4 LC6 I.CS f\CPM ~dpm Oa~e/Time of Count Sample Comments 1 F830 018 3 x 00001 SM Ccll /\-3 42 -10 U0/06/16 10:43 2 F830 018 3 x 00002 SM Cell A-3 41 -12 ~0/06/16 1.0:44 3 F830 0.l!:I 3 x 00003 SM Cell 1\-3 40 -15 ~0/06/16 l0:45 4 F830 018 3 x 00004 SM Cell A-3 Ill -12 ;10/06/16 10:47 s F830 018 3 x 00005 SM Ccll /\-3 ,is -3 'l0/06/16 10:48 6 nuo 018 3 x 00006 SM Cell A-3 63 38 '10/06/16 10:49 7 F830 018 3 x 00007 SM Ccll /\-3 57 25 h.0/06/16 10:.50 8 F830 018 3 x 00008 SM C<:ll /\*3 50 9 10/06/16 10:52 9 F830 011.! 3 x 00009 SM Ccll /\-3 51 11 :10/06/16 10:53 10 F830 018 3 x 00010 SM Ccll /\-3 39 -17 ~0/06/16 10:54 11 F830 om 3 x 00011 SM Cell A-3 44 -5 lto/OG/l6 10:55 12 F830 011:! 3 x 00011 SM Cell /\-3 51 11 :t0/06/16 10:56 13 F830 018 3 x 00013 SM Cell 1\-3 42 -.LO 110/06/J.6 1.0:58 14 F830 O.Ul 3 x 00014 SM Cell A-3 '18 4 i0/06/16 10:59 15 F830 018 3 x 00015 SM Cell A-3 48 4 l0/06/16 11:00 Comments By signature below, 1he required source check ~nd b;ickground checks were s;iLisfocto1ilviPe1forrncd prior 10 use of 1hc instrument idcnlil1cd below.

Ludlum 2929 Benchtop Instrument lJ;::~

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I 3.0 43-10-1S/N:188736 a 0.36'1 CP*"I'  !"run d1)mp1.*r.1r;!;1 A

Tech A Sign/ l)att~ /.'./// #. 10/t-}r:, 46.3 1 7$.9 l'ech B Sign/ O<ite f\\ j ;l Cal Due Date: !;/13/2017 r~ 0.43~

r.pm mi1' d:11111>1.*f,'111:<1 Page 3 Att. 4 Data Assessment F8300183

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