ML17065A063

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Final Status Survey Summary Report, January 30, 2017, Iosb Main Sump, Survey Unit F8300103
ML17065A063
Person / Time
Site: Rancho Seco
Issue date: 01/30/2017
From:
Sacramento Municipal Utility District (SMUD)
To:
Office of Nuclear Material Safety and Safeguards
Shared Package
ML17065A032 List:
References
DPG 17-038
Download: ML17065A063 (20)
v • d • e


Text

Rancho Seco Final Status Survey Summary Report January 30, 2017 IOSB Main Sump Survey Unit F8300103 FSS Engineer Lead FSS Engineer Approved By: /It>,

  • Manager,

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!!.fa-.- Date:

Seco Assets

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FINAL STATUS SURVEY F8300i03 Survey Unit:

F8300103, Interim Onsite Storage Building (IOSB) Main Sump 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 sump,.

to confirm the absence or presence of plant-derived radionuclides. Static measurements showed a mean gross activity level of 2,40 I dpm/l 00 cm 2 and a maximum value of 3,056 dpm/l 00 cm 2

  • The statistics of the sump results combines walls, floor, and ceiling data.

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 14% of the area scanned by beta scanning. The instrumentation used for the survey along with the MDC values are listed in Table 2-1 Attachment 2.

FSS Outside Area Class 3 F8300143

FINAL STATUS SURVEY F8300103 Table 1, Survey Unit Design Parameters Survey Package: F830 Sumps Survey Unit: 10 Class 03 SU Area (m 2 )

  • 80 Evaluator: JR DCGLw: 43,000 Gross Activity DCGL Area Factor NA Class 3 Design DCGLemc (dpm/1 OOcm 2 ): NA Class 3 DCGLemc: NA Class 3 LBGR: 21,500 Default= 50% DCGL Sigma: 466 Scoping Survey Data for Truck Bay Tvoe I error: 0.05 Type II error: 0.05 Predominant Nuclide Cs-137 Sample Area (m 2 ) N/A Total Instrument Efficiency: 0.132 Total Area Scanned (m 2): 11.1 Scan Coveraqe (%) ;{~{<~:lio/l:' Class 3 Choosing 'N/A' sets material Material Type: N/A background to "O"

,_ :<L ~.;};,_ ::~;;:oa:ic.Ui~~esf\i~f!J'~¥~t;:;ff;~i).: .-'.\~.,,;:;;f; *. ~;_\ :~::*: . :*; *:: .,:' cO:Oi'ih~ilis: :.* ;;: *'> * ",>*: :; **~

Z1-a: . 1.6.45 Z1-B: 1.645 Sign p: 0.99865 Calculated Relative Shift: 46.:1 Relative Shift Used: .3.o Uses 3.0 if Relative Shift >3 N-Value: .1.1 N-Value+20%: 14 Survey Results:

A total of 30 direct measurements were made in F8300 I 03 with 15 each being collected in the upper and lower sumps. 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.

2 FSS Main Sump F8300103

FINAL STATUS SURVEY F8300103 Table 2, Static Measurement Results Number S~inple #* Beta (cpm) ~eta.(dpmf 1 F8300103X00001 307 2,326 2 F8300103X00002 302 2,288 3 F8300103X00003 312 2,364 4 F8300103X00004 206 1,561 5 F8300103X00005 234 1,773 6 F8300103X00006 244 1,848 7 F8300103X00007 260 1,970 8 F8300103X00008 215 1,629 9 F8300103X00009 243 1,841 10 F8300103X00010 209 1,583 11 F8300103X00011 248 1,879 12 F8300103X00012 220 1,667 13 F8300103X00013 288 2,182 14 F8300103X00014 294 2,227 15 F8300103X00015 234 1,773 16 F8300103X00016 249 1,886 17 F8300103X00017 258 1,955 18 F8300103X00018 255 1,932 19 F8300103X00019 296 2,242 20 F8300103X00020 208 1,576 21 F8300103X00021 229 1,735 22 F8300103X00022 215 1,629 23 F8300103X00023 242 1,833 24 F8300103X00024 208 1,576 25 F8300103X00025 247 1,871 26 F8300103X00026 258 1,955 27 F8300103X00027 228 1,727 28 F8300103X00028 223 1,689 29 F8300103X00029 252 1,909 30 F8300103X00030 305 2,311 3 FSS Main Sump F8300103

FINAL STATUS SURVEY F8300103 Table 3 contains the statistical summary of the static measurement data for the Outside Area Class 3.

Table 3, Beta Summary Statistics Beta Static Sumps Mean 1,891 Median 1,860 Standard Deviation 249 Minimum 1,561 Maximum 2,364 Count 30 Survey Unit Data Assessment:

The survey design required 14 static measurements for the Sign Test. A total of 30 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. The sample standard deviation was greater than the design standard deviation but both values of sigma resulted in a relative shift greater than three (3), no additional samples were required.

Table 4, Data Assessment .. _., ..

Results

'~

, : .:*-$t-atic:. o.a~a'V~1u~~':: .:_:.* .:< ....... ***:***;:>.

-....... '* .... r, **

  • Gomrn~nts:::; ...

lNumber of Samples: 30 Median: 1,860 Mean: 1,891 Static Data Standard Deviation: 249 Maximum: 2,364

- *__ sign rest Resuits. *** * ; . ':.

  • .  :; ?: .. Comments* *.

Adjusted N Value: 14 S+ Value: 30 Critical Value: 10 Cri.t~ria S~tisfac:ti'ci.n .  :

Comment$*

Sufficient samples collected: Pass Maximum value <DCGLw: Pas$

Median value <DCGLw: Pass Mean value <DCGLw: Pass Maximum value <DCGLemc: NA SiQn test results: Pass

'.*'. *{

      • .* Fir:iaf Status '* Comments*

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.

4 FSS Main Sump F8300103

FINAL STATUS SURVEY F8300103 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. No individual measurement exceeded the DCGL. No potential areas of elevated activity were detected. *

==

Conclusion:==

The FSS of this survey unit was properly designed as a Class 3 survey based on the results of the investigation 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 F83001043 meets the release criteria of JOCFR20.1402.

5 FSS Main Sump F8300103

Attachment 1

'Maps January 30, 2017 Survey Unit F8300103

$ F8300103X00010 13 =1,583 dpm/100 cm2

...,, .. i , ..... (**1 ~ F8300103XOO 11

. *.,) \ \.. *,.:1 I :i\

13 =1,879 dp 00 cm*

-* F.8300103X00008

$13 =1,629 dpm/100 cm' F8300103X00006

$13 =1,848 dpm/100 crn2 F8300103X00013

$13 =2,182 dl?[.lli100 cm"

'**** $F8300103X00012 **

13 =1,667 dpm/100 cm'

(/)

F830010;3X00003 13 *=2,364 dpm/100- crri'

$ F8300103X00014

. \~...

13 =2,227 dpm/100 cm" r'- \ $

.;t; & F8300103XOOO 7

-: )  ;~

r-w 13 =1,970 dpm/1 O cm2

~. ,..1

$ F83001 03X00015 13 =1,773 dpm/100 cm'

$ F8300103Xo0002 j3 =2,288 dpm/100 Cm': F8300103X00005

$13 =1,773 dpm/100 c F8300103X00009

=1,841 dpm/100 cm' SMUD liA TIDEWATER rnc UCllll nts I s.t!CllllllS I Ml'XLlU **uu.trlt".

F8300103X00004 13 =1,561 dpm/100 cm.,

SUMP* MAJN CEILING WALLS FLOOR $

SMUD Appro*..ed by.

Appro'IOI date:

ouno11 ReY No.:

1 Page I Att. 1 Maps F8300103

.F8300103X00027 13 $,727 dpm/100 cm2 ~~_'.;(i\)\:l .t U ;J\:*,:_:'.,-

$ F8300103X00025 F8300103X00028$

13 =1,871 dpm/100 cm2 13 =1,689 dpm/100 cm2 F8300103X00020 $ F8300103X00030 F8300103X00029 13 =1,576 dpm/100 cm 2

  • 13 =2,311 dpm/100 crri2 -~ =1,909 dpm/100 cm'
  • F8300103X00016 $ F8300103X00017 F8300103X00022 13 =1,886 dpmhoo cm' 13 =o1,955 dpm/100 cm2 13 =1,629 dpm/100 cm' F8300103X00018 $

13 =1,932 dpm/100 cm2 F8300103X00021 $E8300103~00026 .

13 =1,735 dpm/100 cm' 13 =1,955 dpm/1 DO cm2 F8300103X00019 13 =2,242 dpm/100 cm' F8300103X00023 $

13 =1,833 dpm/100 cm' SMUD (ii TIDEWATER IPIC rwom:ns tstt!1u1S1S' 'l!osJUu u.tu.n£as F8300103X00024 SUMP-UPPER 13 =1,576 dpm/100 cm' SMUD Appro*od by.

Drawing No.:

==

Description:==

Drown 8.

Oc'd:

Approval dote:

Date:

Rev No.:

Page 2 Att. 1 Maps F8300103

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0

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F8300103X00001

$ J.3 =2,326 dphl/100 cm>

SMUD Wl TIDEWATER INC fll'Cl.-tOIS I Ql{lfflUt. 1 f'll~lll MAllAUllS SUMP SMUD Approved by.

A provol dote:

Rev No.:

Page 3 Art. I Maps F8300103

Attachment 2 Instrumentation December 12, 2016 Survey Unit F8300103

Table 2-1. Survey Unit Instrumentation

Meastjrement ~inimuniUetectab\e Actl.yity* Detectptc Cailbt;~tipn

. Instn1mentT)',~e. * :. D~e..':t>.~teb

'*- ,:. ; Typ'e Effidendes ' . *.*-,*

Beta Static Ludlum Model Beta - 44 7 dpm/100 cm 2 13.2% 317897/331972 Measurement 2350-1 2/10/17 Ludlum Model 44-116 B Detector Beta Static Ludlum Model Beta - 504 dpm/J 00 cm 2 13.2% 317897/331972 Measurement 2350-1 2/10/17 Ludlum Model 44-116 B Detector Swipe Ludlum Model 2929 Beta - 74 dpm/100 cm2 42.8% 166716/170380 Measurements Ludlum Model 44- 11/3/16 10-1 Swipe Ludlum Model 2929 Beta - 79 dpm/ I 00 cm 2 42.8% 166716/170380 Measurements Ludlum Model 44- I 1/3/16 I 0-1

  • 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 Pagel Att. 2 Instrumentation F8300103

Static Measurement MDA Beta Survey Type PR331972 Detector Number 187 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 504 dpm/100 cm 2 Page 2 Att. 2 Instrumentation F8300103

Beta Survey Type PR331972 Detector Number 145 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)°- 5/t
  • E

Where: Br Background Countrate t Count Time (min)

E Efficiency A Area of detector (cm 2)

Static MDA 447 dpm/100 cm 2 .

Page 3 Att. 2 Instrumentation F8300103

Attachment 3 Investigation January 30, 2017 Survey Unit F8300103 (none required)

Att. 3 Investigation F8300103

Attachment 4 Data Assessment February 2, 2017 Survey Unit F8300103

Histogram for Beta Static Activity (dpm/100 cm2) Sumps 1Activily 7 Number of Values 301

/----~- Minimum 1.560.61

//

Mai-:imum 2,363.64!

SD 249.26 6 6 Skewness 0.56 Kurtosis *0.78 1 BMean 1,891.161

// 5 5 BMedian 1.859.85[

0 Normal Di; tribulion 0Less Bins

£1iii.f:i'£0:t.i!t/ OMoreBins u.

2 1 1 1606 1686 1767 1847 1927 II 2008 0

2088 Ill 2168 2248 2329 Page I Att. 4 Data Assessment F8300103

Activ~

Q-Q Plot for Beta Static Activity (dpm/100 cm2) Sumps N = 30 Mean= 1891 Sd

  • 249.3
  • Slope
  • 246.8 lnteicept
  • 1891
  • Correlation, R
  • 0.963 2200

.. Ell BeS! F~ Line 1800

  • 0 0

1600

  • *
  • 0

-1.8 *1.2 -0.6 0.0 0.6 1.2 1.8 Theoretical Quantiles (Standard Normal)

Page 2 Att. 4 Data Assessment F8300103

Smear _Data _calculation_Sheet_101316 I IOSB Final Status Survey I LCl LC1 LC3 LC4 LC6 LC5 flCPM fldpm O<>te/Time of Count Sample Comment~

1 F830 020 3 c 00001 SM tower Sump 47 .7 10/21/16 0930 2 F830 010 3 c 00002 SM Lower Sump 41 *21 10/21/16 0932 3 F830 010 3 c 00003 SM Lower Sump 44 -14 10/21/16 0935

'1 f!!30 010 3 c 00004 SM Lower Sump 42 -18 10/21/16 0937 5 F830 010 3 c 00005 SM Lower Sump 56 14 10/21/16 0938 6 F830 010 3 c 00006 SM lower Sump 58 19 10/21/16 09'10 7 F830 010 ) c 00007 SM Lower Sump 48 -'1 10/21/16 0941 s F830 010 3 c 00008 SM Lower Sump 38 -27 10/21/16 0943 9 F830 0.10 3 c 00009 SM Lower Sump 40 -23 10/21/16 09'15 10 F830 010 3 c 00010 SM Lower Sump 46 .9 10/21/16 0947 l.l F830 010 3 c 0001.l SM Lower Sump so 0 10/21/16 0948

.12 F830 010 3 c OOOLZ SM Lower Sump 56 14 10/21/16 0950 13 F830 010 3 c 00013 SM Lowe' Sump 48 -4 10/21/16 0951 M H;JO ow 3 c 00014 SM Lower Sump 53 7 10/21/16 0953 15 F830 010 3 c 00015 SM Lower Sump 53 7 10/21/16 0944 Comments R\* *.1(t1,n1Ufl' '-":*low, lhl* lf'<1ui11"1(J *;ou1i:1* rhN~ .ind b.lCk{!1ound c1wcl=*. W(~f{' *.:n1':.l:1r:.to1ily r>t*rlonn~ prior la l.rti~ oJ th~ io:;.:tUm(.>nl id1*ntifo~ !.v*low.

Ludlum 2929 Bc'"chtop ln~trumcnt

~;.::

r.ll1crl'OCV bkp, (flUlll 2929 S/N: 182597 r.)te t;lll*.' MOA 3

n ... ..-.

CL 11..2.. *~

43-10-15/N:188736 l;pm rnin dpmpN;uc.1 Tech A Sign/ Date ~,.,.4~ 1z.-i-1r. 4Y.<J I. 78.7 Cal Due Date: 5/13/2017 13 0.434 Tech r. Sign/ Date r-:. j ,l cpm min r:pmp.""r  ;:n~:1 Page 3 Att. 4 Data Assessment F8300103

Copy or Smear_Dala_Calculation_Shcetl2517jr.xlsx IOSB Final Status Survey I.Cl. l.C2 LC3 LC4 LC6 LCS flCPM f.ldpm Date/Time of Count Sample Comments 16 F!l30 010 J c 0001i; SM Sumps 43 -1 12/05/ 16 1045 17 FisJO 010 3 ( C00l7 SM Sumps 41 -G 12/05/16 1046 18 F830 010 3 c 00018 SM Sump~ 45 4 12/05/16 1047 l9 FBJO 010 3 ( 00019 SM Sumps 31 -29 12/05/16 1049 20 FIBO 010 J c 00020 SM Sumps 37 *15 1.2/05/16 1050 21 F830 010 .3 c 00011 SM Sump~ 4G 6 12/05/16 1051

a 1'83il 010 J c 00022 SM Su1111>~ 44 1 12/05/16 1053
n FHJO OLO 3 c 00023 SM Sump.-. so 15 12/05/16 1054
-1 1'830 OlO 3 c 00014 SM Sumps 42 -3 12/05/16 !055 25 FBJO 010 3 c 00025 SM Sumps 41 -6 ll/05/16 1057 2G F830 OlO 3 c 00016 SM Sump~ dO -8 12/05/16 1058 27 FS30 OLO ) c DOOZ7 SM Sumps 39 -10 12/05/16 1059 28 F830 OLD J c 00018 SM Sumps 35 -19 12/05/16 HOO 2~ F830 010 3 c 00019 SM Sump~ 48 u 12/05/16 1102 30 F830 010 3 c 00030 SM Sumps 44 1 12/05/16 *1103 Comnu?nts l~y
;ienatur1.* below, lhl':' required ~oufcc d*l'ck and har.ksround chcd:. wen* sathfactorily performed prior to U!>l' of the in:;trumcnt idcntific.'C.I below.

Ludlum 2929 Benchtop Instrument l*I<.~:

,.rn .. >..~ni'.'r' !JJ:s: t<lunl 2929 S/N: 182597 r.1te 11111.~ MflA 3 l 25.l 43- JO- l S/N: 188736 a 0.364 cpm min 1lp111peor;1u.:a Tech A Sign/ Date /J. * '71~. ;, J/1.-S-16 43.4 l 73.6 Tcr.h ll Si1;n/ D<lle I ~ ) I\

Cal Due Dille: S/13/2017 f3 0.434 Cpm min dpmo~r<.1rN Page l of 1 Page 4 Att. 4 Data Assessment F8300103

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