ML17065A072

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Final Status Survey Summary Report, February 1, 2017, Iosb Office Area, Survey Unit F8300133
ML17065A072
Person / Time
Site: Rancho Seco
Issue date: 02/01/2017
From:
Sacramento Municipal Utility District (SMUD)
To:
Office of Nuclear Material Safety and Safeguards
Shared Package
ML17065A032 List:
References
DPG 17-038
Download: ML17065A072 (18)
v • d • e


Text

l'il Rancho Seco

Final Status Survey Summary Report

'February 1, 2017 1058 Office Area Survey Unit F8300133 Prepared ey:_~---+1-C-----'"'----- oate: -Z -l

  • 17 2* ~-I]

Approved By: ~ Date:

M:a;;::cho Seco Assets

FINAL STATUS SURVEY F8300133 Survey Unit:

F8300133, Interim On site Storage Building (IOSB) Office Area Survey Unit

Description:

Operating History: Desigroed primarily to store packaged radioactive waste containers safely, protected from the *elements, and mainta~n radiological dose as low as reasonably achievable (ALARA), the IOSB possibly stored media of many types, including filters, resins, contaminated chemtlcals, DAW, activate© reactor components, contaminated plant components and other contaminated items. The 1office area was outsidle the radiologically controlled area during operations at the facility.

Site Characterization: Static measurements were made of the floor, walls, and ceiling, to confirm the absence or presence of plant-derived radionuclides. Static measurements showed a mean gross beta activity level of 2,04'7 dpm/100 cm 2 and a maximum value of 2,742 dpm/100 cm 2

  • Based on the levels of gross activity rep0rted, 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 3% 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 Office Area F8300133

FlNAL STATUS SURVEY F8300133 Table 1, Survey Unit Design Parameters

>Evaluatio'n 1nt>i.it.va1u*e.s . "

i' r*.

comments Survey Package: *FS30 Office Su~ey Unit: 13 Class 03 SU Area (m 2) 370 Eyaluator: JR DCGLw: 43,000 Gross Activity DCGL Are~ Factor NA Ctass 3 D~sign DCGLemc (dpm/1 OOcm 2 ): NA Class 3 DCGLemc: NA qass3 LBGR: 21,500 DE;fault 50% DCGL =

Sioma: 334 Sc:::opinq Survev Typ~ I error: 0.05 TYPE:l II error: 0.05 Predominant Nuclide Cs-137 Sample Plrea (m 2) N/A Total Instrument Efficiency: 0. 132 Total Area Scanl')ed (m 2): 11.1 Scan Covetaoe (%) *... ;3~/~; Ct:ass 3 Choosing 'N/A' sets material Material Type: NIA bc;ickground to "O"

.: ,*' :<, *.,_' :. ,' " *ca1cl'J*1afed*Vaiijes*. .*,. . ", '" 'i*.~,*~:, '. ?~:Y*~ :f~~~ ~ .. ,'-.**o'C>mnients

\.

Z1-a: 1.645 Z1-0: 1.645-Sign p: 0.99865 Calculated Relative Shift: 64.3 Relative Sh'ift Used: 3.0 U$es 3.0 if Relative Shift >3 N-Value: 11 N-Vall!Je+20%: 14 Survey Results:

A total of 30 direct measurements were made in F8300133 floor, ceiling, and walls. 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 Office Area F8300133

FINAL STATUS SURVEY F8300133 Table 2, Static Measurement Results NiJm~er Samplei #. * * * :e~ta (cpn:i) .. .*.*

  • aet~ (d~~l:

. {* '* .

1 F8300313C00001 269 1,795 2 F8300313C00002 272 1,848 3 F8300313C00003 240 2,182 4 F8300313C00004 237 2,152 5 F8300313C00005 270 1,652 6 F8300313C00006 262 1,932 7 F8300313C00007 251 2,402 8 F8300313C00008 211 2,038 9 F8300313C00009 297 2,061 10 F8300313C00010 267 1,818 11 F8300313COOO 11 275 1,795 12 F8300313C00012 297 2,045 13 F8300313C00013 246 1,985 14 F8300313C00014 239 1,902 15 F8300313C00015 229 1,598 16 F8300313C00016 318 2,250 17 F8300313C00017 263 2,023 18 F8300313C00018 217 2.083 19 F8300313C00019 254 2,250 20 F8300313C00020 263 1,864 21 F8300313C00021 290 1,811 22 F8300313C00022 223 1,735 23 F8300313C00023 277 2.409 24 F8300313C00024 269 1,992 25 F8300313C00025 272 1,644 26 F8300313C00026 240 1,924 27 F8300313C00027 237 1,992 28 F8300313C00028 270 2,197 29 F8300313C00029 262 1,689 30 F8300313C00030 251 2,098 3 FSS Office Area F8300133

FINAL STATUS SURVEY F8300133 Table 3 contains the statistical summary of the static measurement data for the office area.

Table 3, Beta Summary Statistics Beta Static Office Mean 1,972 Median 1,989 Standard Deviation 215 Minimum 1,598 Maximum 2,409 Count 30 Survey Unit Data Assessment:

The survey design required 14 static measurements for the Sign Test. A total of 30 static

~easurements 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 Number of Samples: 30 Median: . 1,989 Mean: 1,972 Static Data Standard Deviation: .* 215 Maximum: 2,409

.*' ... *. Comments**

Adiusted N Value: 14 S+ Value: 30 Critical Value: 10

  • ** Criteria sa~lsfat:tion * *' *_.,

Sufficient samples collected: Pass Maximum value <DCGLw: Pass Median value <DCGLw: Pass Mean value <DCGLw: Pass Maximum value <DCGLemc: NA Sign test results: Pass Comrrierits 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 Office Area F8300133

FINAL STATUS SURVEY F8300133 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 F8300133 meets the release criteria of 10CFR20.l402.

5 FSS Office Area F8300133

Attachment 1 Maps February 3, 2017 Survey Unit F8300133

F8300313C00006 j

[3 = 1,932 dpm/100 cmz j F830o3 1 3cooo15

~ 13 = 1,598 df?m/100 cm 2

'~- I

{' I l

F8300313C00012 13 = 2,045 dpm/100 cm 2 F8300313C00005 I F8300313C00011 .

13 = 1,795 dpm/100 crn 2 I

13 = 1,652 dpm/100 cm 2 F8300313C00013 c~F8300313C00009 j 13 = 2,061 dpm/100 crn 2 F8300313C00001 13 = 1,985 dpm/100 cm 2 0

. "'--F8300313C00014 13 =1,795 dpm/100 cm 2

\__

13 = 1,902 dpm/100 cm 2 F8300313C00004 p =2, 152 dpm/100 F8300313C00002 13 = 1,848 dpm/100 cm'

. F8300313C00003

.~P=2,182dpm/100cm'

"-' .I F8300313C00007 I . j I~ = 2,402 dpm/100 cm 2 F8300313C00008 I

I

  • ---~-----t*l~"'-------------------=('--.-!'--~~=----_Ji 2

B= 2,038 dpm/100 cm F8300313C00010 13 = 1,818 dpm/100 cm 2

~ l TIDEWATER INcl RAOIOLOC:.tCN._ SERVICCG j I

J SMUD Drowilg No.:

Ot':Seription:

Drawn B.

UA J'.irst n r P.c-::-ul r, Approve~ by.

I Approve! dote:

Dole: 02\l.!lUJ/

Rav No.: i Pagel Att. I Maps 8300133

F8300313C00027 Ii*--

13 = 1 ,992 dpm/1 QO cm 2 8300313C00020 I)::::: 1,864 dpm/100 cm 2 F8300313C00017 f\ = 2,,023 dpm/100 cm 2 Mezzanine- 2nd Floor 1:11 F8300313C00028 13 = 2, 197 dpm/ 00 cm 2 F8300313C0001& I f\ = 2,250 dpm/100 cm 2 F8300313C00026 _J' r~ = 1,924 dpm/100 cm

{r 2

F8300313C00024 I~ = 1.,992 dpm/100 cm 2

  • F8300313C00~19 F8300313C00025 13 = 2,250 dP,m/100 cm 2 B= 1 ,644 dpm/100 cm 2 F8300313C00029 1 B=1,689 dpm/100 cm 2 F8300313C00021 F8300313C00022 I~ = 1]:35 dpm/100 cm 2 ~ f\ ~ 1,811. dpm/100 cm 2 t:J I F8300313C00018

.~.*IT13 = 2,083 dpm/100 cm 2 TIDEWATER INC!

RAOIOl..OCt-CAL SERV1CIZG

--~ ---*-~*--*****-------

, .I

  • ~F8300313C00030 SMUD L-~~~~~~~~~~~~~~---.J I 13 =2,098 dpm/100 cm 2 Approve? by.

ApprOVt;J dote:

Rev No.: i.

Page 2 Att. 1 Maps 8300133

Attachment 2 Instrumentation February 3, 2017 Survey Unit F8300133

Table 2-1. Survey Unit Instrumentation

. M,¢,~~Yl.~~fu~*;~t ' *-.. *;,**

.'1~striu1n¢~t'fyp.e* *

. petectoi:

T~*ti~: ..*. ._ .* . - . . ~

Etfici~iiCies Beta Static Ludlum Model Beta - 502 dpm/100 cm 2 13.2% 317897/331972 Measurement 2350-1 2/10/17 Ludlum Model 44-116 B Detector Swipe Ludlum Model 2929 Beta - 78dpm/100 cm 2 36.9% 166716/170380 Measurements Ludlum Model 44- 42.8% 5/13/17 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 Pagel Att. 2 Instrumentation F8300133

Static Measurement MDA Beta Survey Type PR331972 Detector Number 185 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: Br Background Countrate t Count Time (min)

E Efficiency A Area of detector (cm 2)

Static MDA 502 dpm/100 cm 2 Page 2 Att. 2 Instrumentation F8300133

Attachment 3 Investigation February 1, 2017 Survey Unit F8300133 (none required)

Art. 3 Investigation F8300133

Attachment 4 Data Assessment February 3, 2017 Survey Unit F8300133

I Histogram for Beta Static Activity (dpm/100cm2) Office Area 'Activiy I '~"'-

Minimum Maximum 1.59&48 301 2.409.09 so 214.99 Skewness 0.21 Kuitosis *0.49 BMe"" 1.972.221 B Median 1.988.64 B NouMl Distiibution I

0Less Bins 3

OMoreBins I

I 1621 1702 1783 1864 1945 2027 2108 2189 2270 2351 Page 1 Att. 4 Data Assessment F8300133

Q-0 Plot for Beta Static Activity (dpm/100 cm2) Office Area ActivilY N =30

  • . 2400 *
  • Mean =.1972 Sd
  • 215 Slo?e
  • 219:5 lnteicept = 1972
  • coneletion. R
  • 0.993 2200 II Best Fit Line 1800 1600 *

-1.8 *1.2 U M U 1.2 1.8 Theoretical Quantiles (Standard Normal)

Page 2 Att. 4 Data Assessment F8300133

Swipe sheet office IOSB Final Status Survey lCl LC2 LC3 LC4* LC6 LCS f)CPM fldpm Date/Time of Count Sample Comments 1 F830 013 3 00001 SM IOSB Offices 56 17 2 F830 013 3 00002 SM IOSB Offices 51 5 3 F830 013 3 00003 SM IOSB Offices 36 -29 4 F830 013 3 00004 SM 1058 Offices 37 -27 5 F830 013 3 00005 SM 1058 Offices 35 -32 6 F830 OB 3 00006 SM IOSB Offices 58 21 7 F830 013 3 00007 SM 1058 Offices 44 -:Ll 8 F830 013 3 00008 SM IOSB Offices 59 24 9 F830 013 3 00009 SM IOSB Offices 46 -6 10 F830 013 3 00010 SM IOSB Offices 40 -20 11 F830 013 3 00011 SM 1058 Offices 44 -11 12 F830 013 3 00012 SM IOSB Offices 49 1 13 F830 013 3 00013 SM IOSB Offices 55 15 14 F830 013 3 000l4 SM IOSB Offices 44 -11 15 F830 013 3 00015 SM IOSB Offices 34 -34 Comments By signature below. the required source check and background checks were satisfactorily performed prior to use of the instrument identified below.

Ludlum 2929 Benchtop Instrument br.g efficiency bkg count 2929 S/N: 182597 rate time MDA 3 1 25.l a 0.364

- - ,, ' 43-10-1S/N:188736 cprn min dpm !=N ar~J Tech A Sign/ Date~:;,-;11,//;(/tefl/t, 2/ 3,/ i =;- p 48.7 1 77.8 Tech B Sign/ Date

- Cal Due Date: 5/13/2017 0.434 cprn min dpm per are3 Page 1of1 Page4 Att. 4 Data Assessment F8300133

Swipe sheet office IOSB Final Status Survey LCl LC2 LC3 LC4' LC6 LCS J3CPM J3dpm Date/Time of Count Sample Com- -*

1 FB30 013 3 00016 SM IOS9 Offices 40 -20 2 F830 013 3 00017 SM 1059 Offices 31 -41 3 F830 013 3 00018 SM IOSB Offices 52 8 4 F830 013 3 00019 SM IOSB Offices 46 -6 5 F830 OJ3 3 00020 SM IOSB Offices 43 -13 6 F830 013 3 00021 SM IOSB Offices so 3 7 F830 013 3 00022 SM IOSB Offices 43 :13 8 F830 013 3 00023 SM IOSB Offices 42 -15 9 F830 013 3 00024 SM IOSB Offices 54 12 10 F830 013 3 00025 SM IOSB Offices 41 -18 11 I F830 013 3 00026 SM IOSB Offices 50 3 12 F830 013 3 00027 SM IOSB Offices 39 -22 13 F830 013 3 00028 SM 1056 Offices 44 -11 14 F830 013 3 00029 SM IOSB Offices 32 -38 15 FS30 013 3 00030 SM IOS60ffices 48 -2 Comments By signature below. the required source check and background checks were satisfactorily performed prior to use of the instrument identified below.

Ludfum 2929 Benchtop lnstru ment okg eff1c!er.cy bkg CO:Jnt 2929 S/N: 182597 rate time: MDA 3 1 25.l

_,p/ a 0.364

.A' ;J I 43-10*15/N:188736 cpm mir. d;Ynpe:aru Tech A Sign/ DateCft-:-f21"'/ /1/f;fff-

..., 2/SI /..,L-- 48.7 1 77.8 0

°'""/Date I Cal Due Date: 5/13/2017

~ 0.434 cpm min dpm oc: areil Page 1of1 Page 6 Att. 4 Data Assessment F8300133

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