ML17065A064

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Final Status Survey Summary Report, January 30, 2017, Iosb Hot Cell, Survey Unit F8300061
ML17065A064
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: ML17065A064 (16)
v • d • e


Text

  • Rancho Seco Final Status Survey Summary Report January 30, 2017 IOSB Hot Cell Survey Unit F8300061 Approved By: ~. Date: ~ /17 Manager, Rancho Seco Assets

FINAL STATUS SURVEY F8300061 Survey Unit:

F8300061, Interim Onsite Storage Building (IOSB) Hot Cell 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 on the floor and wall surfaces, to confirm the absence or presence of plant-derived radionuclides. Static measurements showed a mean gross beta activity level of 2,880 dpm/l 00 cm 2 and a maximum value of 5, 112 dpm/100 cm 2

  • Previous surveys and floor scanning indicated significant contamination in excess of the DCGLw. This area was identified and characterized separately as a hot spot. The average static measurement in the hot spot was 390, 104 dpm/100 cm 2 and a maximum value of 2,285,418 dpm/100 cm 2 . The hot spot was remediated prior to performance of the FSS. Based upon the hot spot the Hot Cell was classified as a MARSSIM Class 1 survey unit.

Survey Unit Design Information:

In accordance with MARSSIM Section 4.6, special considerations may be necessary for survey units with structure surface areas less than 10 m2 or land areas less than 100 m 2

  • In this case, the number of data points obtained from.the statistical tests is unnecessarily large and not appropriate for smaller survey unit areas. The data generated from these smaller survey units should be obtained based on judgment, rather than on systematic or random design, and compared individually to the PCGLs. This survey unit meets this criterion as the size is less than ten square meter (8 m2).

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 based upon professional judgment in accordance with MARSSIM guidance and approximately 100% of the area scanned. The instrumentation used for the survey along with the MDC values are listed in Table 2-1Attachment2.

FSS Hot Cell F8300061

FINAL STATUS SURVEY F8300061 Table 1, Survey Unit Design Parameters

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  • Survey PackaQe: F830 Hot Cell Survev Unit: 006 Class 1 SU Area (m 2) 8 Evaluator: JR DCGLw: 43,000 Gross Activity DCGL Area Factor 3.3 Class 1 Desiqn DCGLemc (dpm/100cm 2 ): 141,900 Class 1 LBGR: 141,90( =

Default 50% DCGL Sigma: 740 Scoping Survey Data Type I error: 0.05 Type II error: 0.05 Predominant Nuclide Cs-137 Sample Area (m 2) N/A Total Instrument Efficiency: 0.129 Total Area Scanned (m2): 8 Scan Coveraqe (%) *. ~ :;.}i'.t>O:?lo'.!: Class 1 Choosing 'N/A' sets material Material Type: N/A background to "O"

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Z1'{L: 1.645. .,,

Z1-o: 1.645' SiQn p: b. 99865 Calculated Relative Shift: 29.0 Relative Shift Used: 3.0 Uses 3.0 if Relative Shift >3 N-Value: 11 N-Value+20%: 14*

Survey Results:

A total of l 5 direct measurements were made in F8300061. 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 Hot Cell F8300061

FINAL STATUS SURVEY F8300061 Table 2, Static Measurement Results

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  • 1 Number"
  • S~mpl~.# Be_ta (cpm) ,.
  • .B~ta.

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1 F8300061X00001 364 2,758 2 F8300061 X00002 396 3,000 3 F8300061X00003 425 3,220 4 F8300061X00004 362 2,742 5 F8300061X00005 350 2,652 6 F8300061X00006 435 3,295 7 F8300061X00007 605 4,583 8 F8300061X00008 397 3,008 9 F8300061X00009 414 3,136 10 F8300061X00010 314 2,379 11 F8300061X00011 362 2,742 12 F8300061 X00012 282 2,136 13 F8300061X00013 357 2,705 14 F8300061X00014 423 3,205 15 F8300061X00015 407 3,083 Table 3 contains the statistical summary of the static measurement data for the Hot Cell.

Table 3, Beta Summary Statistics Beta Static Hot Cell Mean 2,976 Median 3,000 Standard Deviation 550 Minimum 2, 136 Maximum 4,583 Count 15 Survey Unit Data Assessment:

The survey design required 15 static measurements located based upon professional judgment. Following the guidance in MARSSIM Section 4.6, these values are compared directly to the DCGLw.

The comparison and the results are presented in Table 4. The sample mean and median values were less than the DCGL.

3 FSS Hot Cell F8300061

FINAL STATUS SURVEY F8300061 Table 4, Data Assessment Results

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Number of Samples:

  • 15 Median: 3,QOO Static Data Standard Deviation: 550 .

Maximum: 4,583 .

Adjusted N Value: 14 S+ Value: '15.

Critical Value: 1()

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Sufficient samples collected: Pass

  • Maximum value <DCGLw: Pass Median value <DCGLw: .Pass Mean value <DCGLw: Pa$S
  • 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 1.ong 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 I 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 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 1 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.

4 FSS Hot Cell F8300061

FINAL STATUS SURVEY F8300061 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 F8300061 meets the release criteria of l OCFR20.1402.

5 FSS Hot Cell F8300061

Attachment 1 Maps January 30, 2017 Survey Unit F8300061

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/f'\.F! 300061X0003 W13 1:3,220 dpm/100 cm" F8300061X0009 $

f3 =3,136 dpm/100 cm2 F8300061X0002 ~

f3 =3,000 dpm/100 cm F8300061 X0011 f3 =2,742 dpm/100 cm"

&F8300061X0014

& F8300061 X0015 &F8300061X0006 W f3 =3,083 dpm/100 cm2 W f3 =3,202 dpm/100 er l2 W f3 =3,295 dpm/100 cm2 L'.t::-,. F8300061X0008 F8300061X0013 f3 =2,705 dpm/100 c W[3 =3*008 dpm/100 .%F8300061X0005 W f3 =2,652 dpm/100 cm2 F8300061X0007 $

&F8300061X0004 f3 =4,583 dpm/100 cm2 Wf3 =2,742 dpm/100 cm2 F8300061X0001 $ L!'..F8300061X0010 f3 =2,758 dpm/100 cm2 W13 =2,379 dpm/100 cm 2 F8300061X0012 SMUD ~TIDEWATER INC f3 =2,136 dpm/100 cm"~

U GIN'H:!l;S I SCIUITfSt S I PllotiMMMAJU,G.!RS DAW BAY* HOT CELL SMUD Location: Rancho Seco Approved by.

Task: Final Status Surve Drawing No. : IOSB Final Status Surve

Description:

HOT CELL

!Xown B. C Gra 0 6 12 Oc'd: J Reese Appro'IOI date: 5cale In feet Dote: 0U62017 Rev No.:

Page I Att. I Maps F8300061

Attachment 2 Instrumentation January 25, 2017 Survey Unit F83000061

Table 2-1. Survey Unit Instrumentation M~asµi;ement Miniml_im *~etcctabfo: Activity~ Oe(ector . Calibration.'

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,T:Y:P,e* :*. ( *~ ' . . ' *Efficiende.s Beta Static Ludlum Model Beta - 466 dpm/100 cm 2 13.2% 317897/331972 Measurement 2350-1 2/10/17 Ludlum Model 44- l 16 B Detector Swipe Ludlum Model 2929 Beta - 74.5 dpm/l 00 cm 2 43.4% 1825971188736 Measurements Ludlum Model 44- 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 Page 1 Att. 2 Instrumentation F8300061

Static Measurement MDA Beta Survey Type PR331972 Detector Number 158 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 .. A/100 (NUREG 1507)

Where: Br Background Countrate t Count Time (min)

E Efficiency A Area of detector (cm 2)

Static MDA 466 dpm/100 cm 2 Page 2 Att. 2 Instrumentation F8300061

Attachment 3 Investigation January 30, 2017 Survey Unit F8300061 (none required)

Att. 3 Investigation F8300061

Attachment 4 Data Assessment January 25, 2017 Survey Unit F8300061

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Histogram for Beta Static Activity (dpm/100cm2) Hot Cell Nl.M'rb6rofValt..ie: 15 M~ 2.13&.3' M""""" .(581 33 so

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2936 3670 3915 '160

Page I Att. 4 Data Assessment F8300061

Q-Q Plot for Beta Static Activity (dpm/100cm2) Hot Cell Activ~

H*15 Mean*297S Sd*~9.9 s..... 520.6

'400 . lrtoi~*2976 ConclaOOn.f! *0.905 IEIBeitFitlft 3200 2<00

  • 1.5 *1.0 -0.5 0.0 0.5 1.0 1.5 Theoretical Quantiles (Standard Normaq Page 2 Att. 4 Data Assessment F8300061

Smear _D;it a_ Calculation _Sheet _101316 IOSB Final Status Survey I.Cl I.Cl. LC3 1.Cll I.CG LCS (ICPM jldpm Date/Time of Count Sample Comments 1 FH30 006 l c 00001 SM Hot (<:'II 49 10 11/01/lG 1210 2 F830 006 I c 00002 SM Hol Cell 5.:J 20 11/01/1c; 1211 3 ~1:130 006 I c 00003 SM HO\ Cell 50 l3 11/01/16 1212 4 f830 006 I c 00004 SM Ho! Ci:ll 58 31 u/Ol/lu 1214 s FS30 006 I c 00005 SM Hot Cell 44 -1 11/01/16 1215 6 F830 006 J c 00006 SM Mot Cell 47 6 U/01/16 l.2.16 7 F830 006 l c 00007 SM HOI Cell 53 20 11/01/IG 12.17 8 FB30 OOG I c 00008 SM Hot Cell 53 20 ll/01/16 12.19 9 F830 006 I c 00009 SM Hot Cell 52 17 ll/01/lC. 1220 10 F830 006 l c 00010 SM Hot Cdl 59 33 11/01/!G 122.1 11 H!JO OOf, I c 00011 SM Hol Cell 47 6 11/01/16 1222 12 f830 006 I c 00012 SM Hot Cc~! 119 10 11/01/Hi 1224 l3 f.830 006 1 c 00013 SM Hot C~ll 51 15 11/01/16 J.225 14 F8:30 ooc. I c 00014 SM Hot Cell 62 40 11/01/IG 1226 15 F830 006 l c 00015 SM Hot Cell 42 -6 11/01/16 1227 Comrnents nv 5*r:n:1ru1t: llC"low. the reoui11~ ~oori.:c ch1:cl.:. and o,,d:cround t:hf:<:k'.~w1~rt* '.;,;11i~l.1c1oritv p<;rlornh-.,,:t mio1 to u!-..-~ of lh~ insuvmcnt identified b..:luw.

Ludlum 2929 Bcnchtop Instrument

!)!:1; C'f1ic1.,.*11t\* l1~:r. C\>Ulll 2929 S/N: 182597 rah~ dm<< Ml)A llOIV/O!

<:X 0.36'1 43*:10*1S/N:188736 Cf)lll 111l11 dpmJ>r:r.1rr:;1 Tech A Sign/ Date fL 11-~* /jJ..-1~!6 114.~ l 711.5 T1~ch B Sign/ Da;e / ,,,! /(

Cal Due Date: 5/13/2017 fJ 0.434 C:::j)ln min dp:n pl!: ;1r,:-:z Page 3 Att. 4 Data Assessment F8300061

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