ML17065A051

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Final Status Survey Summary Report, December 1, 2016, Iosb Storage Cell D-2, Survey Unit F8300263
ML17065A051
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: ML17065A051 (16)
v • d • e


Text

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Rancho Seco Final Status Survey Summary Report December 1, 2016 IOSB Storage Cell D-2 Survey Unit F8300263 Approved By: ~<<--- Date: i:J-/iq(1t.,

ManaQe;R nchO Seco Assets

FINAL STATUS SURVEY F8300263 Survey Unit:

F8300263, Interim Onsite Storage Building (IOSB) Storage Cell D-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 beta gross activity level of 2,062 dpm/l 00 cm 2 and a maximum value of 2,674 dpm/l 00 cm 2

  • 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 32% of the area scanned. The instrumentation used for the survey along with the MDC values are listed in Table 2-1 .

FSS Storage Cell D-2 F8300263

FINAL STATUS SURVEY F8300263 Table 1, Survey Unit Design Parameters

  • eva"1~aiic>r1. fo'put va1u.~s* ..*

Comments ..*'

Survey Packaoe: F830 Storaoe Cell D-2 Survey Unit: 26 Class 03 SU Area (m2) 24 Evaluator: JR DCGLw: 43,000 Gross Activity DCGL Area Factor NIA Class 3 Design DCGLemc (dpm/100cm 2 ): N/A Class 3 DCGLemc: N/A Class 3 LBGR: 21,500 Default= 50% DCGL Sioma: 174 Scooina 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 Coveraqe (%)  ; . i. ~{3'2% ..: Class 3 Choosing 'N/A' sets material Material Type: N/A background to "O"

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""  :.:~.:caiC.~1at'~a-v.ai:~e~f\  :>*<. **::*,,:c.* ;._: *: _:.;; * :\ ':*.:.

  • c_cfm!Ti~!-its'.:** ,::*:n<:t':.

Z1-a: 1.645 Z1-0: 1.645 Sign p: 0.99865 Calculated Relative Shift: 123.5 Relative Shift Used: 3.0 Uses 3.0 if Relative Shift >3 N-Value: 11 N-Value+20%: 14 2 FSS Storage Cell D-2 f 8300263

FINAL STATUS SURVEY F8300263 Survey Results:

A total of 15 direct measurements were made in F8300263. 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. .*. S,am.pl.e # * . Beta (cpm). . Beta (dpmt 1 F8300263X00001 286 2,167 2 F8300263X00002 273 2,068 3 F8300263X00003 236 1,788 4 F8300263X00004 274 2,076 5 F8300263X00005 269 2,038 6 F8300263X00006 247 1,871 7 F8300263X00007 247 1,871 8 F83002$3XOQ008 274 2,076 9 F8300263X00009 268 2,030 10 F8300263X00010 287 2,174 11 F8300263X00011 240 1,818 12 F8300263X00012 297 2,250 13 F8300263X00013 255 1,932 14 F8300263X00014 260 1,970 15 F8300263X00015 270 2,045 Table 3 contains the statistical summary of the static measurement data for the Storage Cell D-2 Table 3, Beta Summary Statistics Beta Static D-2 Mean 2,012 Median 2,038 Standard Deviation 135 Minimum 1,788 Maximum 2,250 Count 15 3 FSS Storage Cell D-2 f 8300263

FINAL STATUS SURVEY F8300263 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: 2,03.8 Mean: 2.012 Static Data Standard Deviation:

  • 135 Maximum: 2;250 Adjusted N Value: 14 S+ Value: 15 Critical Value: 10 Sufficient samples collected: Pais .

Maximum value <DCGLw: Pass... ,.

Median value <DCGLw: Pciss Mean value <DCGLw: Pass Maximum value <DCGLemc: NIA' Sign test results: .. Pas$

~:tr.':'*::).: :. ,i,, .*; , *, *:~1:r. a1: s~~t()_§PX::~*;i;~~i/~;,s:ft '.;?::;'.~:;:;:; 1:, :.~\ > :{. .¢ofo m.~r.i~ ,*} :\ :*,_; ,; * ** 2 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 D-2 f 8300263

FINAL STATUS SURVEY F8300263

==

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 8300263 meets the release criteria of I OCFR20. l 402.

5 FSS Storage Cell D-2 f 8300263

Attachment 1 Maps December 1, 2016 Survey Unit F8300263

I F8300263X00002

,____ fl= 2.068 dpm/100 cm* N A*1 A-2 A*3 ii& ~-

w E B-1 8-2 8*3 Ce II Store: seC-3 C-1 C-2

~~ i D-1 D-2 0 *3 F8300263XOOO~

fl =2,030 dpm/100 cm*

E-1 E-2 E-3 F8300263X00013 $

F830 l2 B3X00004 fl = 1,932 dpm/100 cm*

fl= 2 o~ 6 dpm/100 cm

. I F8300263X00005 F8300263X00003 fl= 2.038 dpm/100 cm* fl = 1,788 dpm/100 cm'

$ F8300. 6 X00012$

$ F8300263X00001 fl = 2.2 )C dpm/100 cm*

$fl= 2 167 dpm/100 cm*

- y Reference Point F8'. h0263X00015 P= 12.045 dpm/100 cm~

F8300263X00006 fl = 1,871 dpmf100 cm F8300263X00007 p = 1.871 dpm/ 100 ;

  • c F8300263X00010 fl = 2 174 dpmf100 cm*

1l' sMuall TIDEWATER INC RADIOLOGICAL SERVICES INTERIM ONSITE STORAGE BUILDING 0058) F8300263X00008

"""'rn"' No.: 4-1426 SMUD $ fl= 2 076 dpmf100 cm*

Location: Rancho Seco ITolk: Approwd by.

Final Status Drawing No.: IOSB Final Status Survev F8300263X00011$

Oeecrlpllon: Cell 0

  • 2 *o....er Wall Results 11 =1 ,818 dpmr100 cm* 0  ? 10 I~ 20 2?

Drown By. le Grav IOC'd: 11 Du.a

~8300263X00014 Sea.: in fc:c Dote: 10272016 Approval dote: I = 1 970 domf100 cm ~

Rev No.: 1

Attachment 2 Instrumentation October 11, 2016 Survey Unit F8300263

Table 2-1. Survey Unit Instrumentation lVlin'intu:n:l Detecta_t>Je Activity" De.te.ctor

  • Calibra_tio1t tmci~ncies pµ~ Dateb._

Beta Static Ludlum Model Beta - 522 dpm/I 00 cm 2 13.2% 317897/331972 Measurement 2350-1 2/l0/17 Ludlum Model 44-1 16 B Detector Swipe Ludlum Model 2929 Alpha - 3 dpm/100 cm 2 36.9% 166716/170380 Measurements Ludlum Model 44- Beta - 81 dpm/100 cm 2 42.8% ll/3/l6 10-1

  • Minimum detectable activities for the count rate instrumentation were calculated in accordance with NUREG-1507, "Minimum Detectable Concentrations with Typical Radiation Survey lnstruments 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 f 8300263

Static Measurement MDA Variables Beta Survey Type PR331972 Detector Number 201 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 Backgrou.nd Countrate t Count Time (min)

E Efficiency A Area of detector (cm 2)

Static MDA 522 dpm/100 cm 2 Page 2 Att. 2 Instrumentation f 8300263

Attachment 3 Investigation October 11, 2016 Survey Unit F8300263 (none required)

Att. 3 Investigation f 8300263

Attachment 4 Data Assessment October 11, 2016 Survey Unit F8300263

Histogram for Beta Static Activity Cell D-2 A c tJv~

Nwbel ol VeLe; 15 M....., 1.101.ae\

M........ 2.25/JIJJ SD 135.21 \

Skewneu -0.07 1

........ *QlZ

[i'IM.,. 2.01162

[i'IM.o.n 2.037.00 Stloima!Diwhlliorl 0Len9flr 0MOfe8nt I I 1002 1840 18SS 19'1 1997 2126 21n 2218 Page 1 Att. 4 Data Assessment F8300263

Q-Q Plot for Beta Static Activity Cell 0-2 Aclivq tl *15.

/dean* ?:012 Sd* 135.2 51ooo*1l9.6 lnttieftPl*2012 Conel.!ilion,R*n&

l160 2100 i ~""*

=fi I <(

100)

.- lf.00

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

Page2 Att. 4 Data Assessment F8300263

Smear_Oat~_ Calculation_Sheet_l01316 IOSB Final Status Survey I.Cl LC2 LC3 LC4 LCG LCS f3CPM fldpm Date/Time of Count Sample Comments 1 F830 026 3 x 00001 SM Cell D*2 54 3 10/04/16 10:24 2 ~830 026 3 x 00002 SM Cell D-2 45 -18 10/04/16 10:25 3 F830 026 3 x 00003 SM Cell D*2 43 -23 10/04/16 10:26 4 F1:130 026 3 x 00004 SM Cell D-2 42 -25 10/04/16 10:28 5 F!l30 026 3 )( 00005 SM Cell D-2 .is -11 10/04/16 10:29 6 FS30 026 3 >: 00006 SM Cell D*2 38 .34 10/04/16 10:30

] FS30 02(: ~ x 00007 SM Ccl! D-2 s~ *2 10/04/16 10:32 8 F330 026 3 x 00008 SM Cell 0*2 41 .27 10/04/16 10:33 9 F830 02b J x 00009 SM C*~ll D-2 57 9 10/04/16 10:34 10 F830 026 3 x 00010 SM Cell D*2 49 -9 10/04/16 10:35 11 F830 026 3 x 00011 SM Cell D 2 ~7 *14 10/04/16 10:37 12 F830 026 3 x 00012 SM Cell 0*2 52 -2 10/04/16 10:38 13 F830 026 3 x 0001.3 SM Cdi 0-2 ~7 *14 10/04/16 10:39 J.1 F$30 026 3 x 00014 SM Cell 0-2 ~5 -18 10/04/16 10:40

--:IS FH30 01.G 3 *X 00015 SM Cell D*?. -32 39 10/04/16 10:42 Comments IJ.y sig11alur(* below. the required ~Olll'CC cht:.*ck and background checks were salisfoclorily performed prior to u5C or the instrument identifi<?d below.

Ludlum 2929 Benchtop Instrument

!:i:t etfi.:."'!f\cy bkg c:cunt 2929 5/N: 182591 rate ti:r,{! Mil/\

1 3.0

0. 0.364 43-10-1S/N:188736 cpm min <Jpm j'>CI. :~r'C<I "fech A Sign/ Date //_ /J,,..,A * -;;*~m:*7*:_/6 /iJ-1./-//, 52.9 l 80.9 Tech I~ 5ign/ O~te / t-)i~

Cal Due Date: 5/13/2017 B 0.434 r.pm min dpo1 fJC~r .1rr;1 Page 1of1 Page 3 Att. 4 Data Assessment f 8300263

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