ML17065A058

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Final Status Survey Summary Report, January 6, 2017, Iosb Cask Wash Down Area, Survey Unit F8300323
ML17065A058
Person / Time
Site: Rancho Seco
Issue date: 01/26/2017
From:
Sacramento Municipal Utility District (SMUD)
To:
Office of Nuclear Material Safety and Safeguards
Shared Package
ML17065A032 List:
References
DPG 17-038
Download: ML17065A058 (16)
v • d • e


Text

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iRancho Seco Final Status Survey Summary Report January 6, 2017 IOSB Cask Wash Down Area Survey Unit F8300323 Prepared By: £G FSS Engineer Date: I. CL 11-Reviewed Approved By:

FINAL STATUS SURVEY F8300323 Survey Unit:

F8300323, Interim Onsite Storage Building (IOSB) Cask Wash Down 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 (ALAR.A), the IOSB contained and 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 floor, walls, and ceiling of the Truck Bay, to confirm the absence or presence of plant-derived radionuclides. Static ,

measurements showed a mean gross activity level of 2,374 dpm/100 cm 2 and a maximum value of3,517 dpm/l 00 cm2

  • The Cask Wash Down was included in the Truck Bay scoping survey. 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 24% of the area scanned. The instrumentation used for the survey along with the MDC values are listed in Table 2-1 .

FSS Cask Wash Down F8300323

.FINAL STATUS SURVEY F8300323 Table 1, Survey Unit Design Parameters j;\/a1li~ti'ort:1n6ot\lalu~s~>:. .:**. '<::; ,):.;:.

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Survey Packaqe: F830 Cask Wash Down Survey Unit: 032 Class 3 SU Area (m ) 2 14 Evaluator: JR I DCGLw: 43,000 Gross Activity DCGL Area Factor NA Class 3 Desiqn DCGLemc (dpm/1 OOcm 2 ): NA Class 3 DCGLemc: NA Class 3 LBGR: 21,500 Default = 50% DCGL SiQma: 466 ScopinQ Survey Data for Truck Bay Type I error: 0:05 Type II error: 0.05 Predominant Nuclide Cs-137 Sample Area (m2) N/A Total Instrument Efficiency: 0.132 Total Area Scanned (m 2): 3.3 Scan Coveraqe (%) ' i.:.:.24j0};;::1. Class 3 Choosing 'N/A' sets material Material Type: N/A backqround to "O"

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Z1-a: 1.645 Z1-a: .1.645 Siqn p: 0.99865 Calculated Relative Shift: 46.1 Relative Shift Used: 3.0 Uses 3.0 if Relative Shift >3 N-Value: 11 N-Value+20%: 14 2 FSS Cask Wash Down F8300323

FINAL STATUS SURVEY F8300323 Survey Results:

A total of 15 direct measurements were made in F8300323. 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 N~mbet * .

  • SaJTiple: #. .sei~. (cP.in) Bet!! (dPrn)

.. . .. .- ~ . *' . .. '* .'* ..

1 F8300323X00001 279 2,114 2 F8300323X00002 283 2,144 3 F8300323X00003 349 2,644 4 F8300323X00004 314 2,379 5 F8300323X00005 338 2,561 6 F8300323X00006 290 2,197 7 F8300323X00007 287 2,174 8 F8300323X00008 325 2,462 9 F8300323X00009 284 2,152 10 F8300323X00010 288 2,182 11 F8300323X00011 254 1,924 12 F8300323X00012 272 2,061 13 F8300323X00013 296 2,242 14 F8300323X00014 260 1,970 15 F8300323X00015 232 1,758 Table 3 contains the statistical summary of the static measurement data for Cask Wash Down Area.

Table 3, Beta Summary Statistics Beta Static Cask Wash Down Mean 2, 197 Median 2,174 Standard Deviation 237 Minimum 1,758 Maximum 2,644 Count 15 3 FSS Cask Wash Down f 8300323

FINAL STATUS SURVEY F8300323 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

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Number of Samples:

  • 15~

Median: 2,1*74 Mean: 2,197 Static Data Standard Deviation: . *437

  • Maximum: 2,644 .
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Adjusted N Value: .* .14 S+ Value:

  • 1S Critical Value: \0 .

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Sufficient samples collected: P.ais

  • Maximum value <DCGLw: Pass Median value <DCGLw: Pass
  • Mean value <DCGLw: Pa~s Maximum value <DCGLemc: . \\J){'

Siqn test results: .. Pass.

\*i :;: :~>;;.t't ;~ *:-.:;};. . ;* **>~rn'iit~statti~:i::;}:;ff'::t.': *Zf?C \:).'<':*< ;':ft/'.Ui' *>>:.:';: o9rn rn~ilis** :. . I. *.: :::;v: :>Yf The survey unit passes all conditions: Pass

  • Surve.y 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 c.haracterization data used for survey design. 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 scoping survey. The required number of direct measurements was made and 4 FSS Cask Wash Down f 8300323

FINAL STATUS SURVEY F8300323 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.

lt is concluded that survey unit F8300323 meets the release criteria of I OCFR20. l 402 .

5 .fSS Cask Wash Down f 8300323

Attachment 1 Maps January 6, 2017 Survey Unit F8300323

(+/-) F8300323C00009 F8300323C00015 13 = 2, 152 dpm/1 00 cm 2 13 = 1,isa dpm/1 oo c F8300323C00006 F8300323C00.003 13 =2,197 dpm/100 cm' '

  • .
  • 13 = 2;644 dpm/100 cm 2 (f) . . ..

P323C00012 J3 __ 2,061 dpm/100.cm 2

@ FB300323CdoOb8 F8300323C00013 *J3= 2,462 dpm/100 cm 2 *

~-;,, 2,242 dpm/100 cm 2 . F8300323'C0001"4 . I 13 = 1;970 dprnhoo.c *. 2

<+/-) F8300323C00005. .

=

13 2, 561 dpm/1 oo. cm 2 F8300323C00002 @

13 = 2, 144 dpm/1 oo cm 2

(+/-} F8300323C00007 *

.I J3 = 2, 174. d pm/1 00 cm 2 (f) F8300323C00004 13 = 2,379 dpm/100 crri_2 SMUD Fil TIDEWATER Ul~ltllls.tlUmUS1 INC

...Xll.UIMA.lllACUS @ F8300323C00001 Cask Wash Down J3 = 2,114 dpm/100 cm 2 F8300323C00010 SMUD 13 = 2,182 dpm/100 cm2  :

cm.

Approvct dote:

Page I Att. 1 Maps f 8300323

Attachment 2 Instrumentation January 6, 2017 Survey Unit F8300323

Table 2-1. Survey Unit ,Instrumentation

.* Calibi:ation bu~])ateb Beta Static Ludlum Model Beta - 485 dpm/100 cm 2 13.2% 3] 7897/331972 Measurement 2350-1 2/10117 Ludlum Model 44-116 B Detector Swipe Ludlum Model 2929 Beta - 78 dpm/l 00 cm 2 43.4% 182597/l 88736 Measurements Ludlum Model 44- 5/13117 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 VariolJs Contaminants and Field Conditions" (U.S. NRC, 1997).

b Detectors are reqllired 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 8300323

Static Measurement MDA Beta Survey Type PR331972 Detector Number 172 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 (cm2)

Static MDA 485 dpm/100 cm 2 Page 2 Att. 2 Instrumentation f 8300323

Attachment 3 Investigation January 6, 2017 Survey Unit F8300323 (none required)

Att. 3 Jnvestigation f 8300323

Attachment 4 Data Assessment January 6, 2017 Survey Unit F8300323

Histogram for Beta Static Activity (dpm/100 cm2 ) Cask Wash Down Area Activity

~lumb&r ol VtiJom 15,

l Mnitl'U'J1 1.157.sai Maicirun 2~'394 1 SD 237.ioJ 0251 Kuitoi:is 0.021 0MeM 2.197471 B M""" 2,174.24 0Noona!Oi7!.1ibulion 0 Len6.,_i 0Moio!Oirll

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I I 1773 1061 1950 2039 2127 221 6 2305 2393 2482 25)1)

[___ - *-~-- __J Page 1 Att. 4 Data Assessment F8300323

Aclivq, Q-Q Plot for Beta Static Activity (dpm/100 cm2) Cask Wash Down Area t1*15 Mean*2197 5d*237.2 S~*2"4"4 lrtcn:n.it*l1S7 Ccue!OOcn. A

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  • 1.5 *1.0 -0.5 0.0 0.5 1.0 1.5

,1 Theoretical Quantiles (Standard Normal)

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1 i Page2 Att. 4 Data Assessment F8300323

Smear_O~ta_Calculation_Sheet_101316 IOSB Final Status Survey I I.Cl LC2 LC3 LC4 LCfi I.CS OCPM lldpm Date/Time of Count Sample Comments

  • I l F830 032 3 x 00001 SM Cask WJSll Down 39 -21 10/18/16 1343
1 2 F830 032 3 x 00002 SM Ca:;k '.Nash Down *16 -5 10/18/ Hi 1345

'1 3 FS30 032 3 x 00003 SM C~!.k W;Jsh Down 48 -1 10/18/16 1347

1 4 F830 032 3 x 00004 SM C<1sk Vi.'ash Dow11 36 -28 10/18/16 1348
I 5 F830 032 3 x 00005 SM Ca~k \A/a$h Down 3LI -33 10/18/16 1329

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I 6 F830 032 3 x 00006 SM (()sk \.\';ish Down 52 9 10/18/16 1350 11

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7' F830 032 3 x 00007 SM Cnsk W:Jsh Down 4~ -8 10/18/16 1352 8 F830 032 3 x 00008 SM Cask Wash Down 44 -10 10/18/16 1353 9 F830 032 3 x 00009 SM CJsk Wash Down 52 9 10/18/16 13511 10 f830 032 3 x 00010 SM Ca:;k Wilsh Down 53 11 10/18/16 1355 11 FS30 032 3 x 00011 SM Cask wash Down 43 -12 10/18/16 l357 12 F830 032 3 Y. 00012 SM (ask w.:1sh 0011.*n 46 -5 10/18/16 l3S8 J.3 F830 032 3 x 00013 SM Ci:isk \Nash Dow11 40 -19 10/18/lG 1359 l~ F830 032 3 x 00014 SM Cask Wash Down 51 6 10/18/.LG 1400 15 F830 032 3 x 00015 SM CJsk W~sh Down 51 6 10/18/16 1401 Com1nents Dy \ign.1tun~ t.t:low. thz~ 1f:i.tui11xt ~wo:ch1:cl: ~lflcl b<td:r,rovncf ch1:d::. wt:n.* >1ti!>lilCIOfil'1 performed prior \a v:i.ic °'the iri:.trvment ir:it'1\tifil:d b(...low.

Ludlum 2929 Bcnchtop ln~rumcnt bL:r, I

o:*lfit1o'*!'\CV Like (:ii.UH 2929 S/N; J.82597 1~)tC 1r1111: MO;\

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<X 0.364 43-10-1S/N:188736 cpm flllll dpm P*'.'t:lf.:-:i Tech fl. Sign/ Dale <-/'..../..//, /-'-.7 '" ln1lt1.. 48.3 l 77.5 Tech B Sign/ Dale Cal Due Date: 5/13/2017 f.~ 0.434 10.J,i:... cpm niin dp.mpl..ra:1:-;i I

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I Page 3 Att. 4 Data Assessment f 8300323

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