ML091000378

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Final Status Survey Summary Report 09/22/08, AB Rooms 309-313, 316, 317 & 350 + 40 to +50, Survey Unit F8131691
ML091000378
Person / Time
Site: Rancho Seco
Issue date: 09/22/2008
From: Tallman D
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
Shared Package
ML090830613 List: ... further results
References
DPG 09-097, F8131691
Download: ML091000378 (42)
v • d • e


Text

Rancho Seco Final Status Survey Summary Report September 22, 2008 AB rooms 309-313, 316, 317 & 350 +40' to +50' Survey Unit F8131691 Prepared By: Dan A. Tallman Date: September 22, 2008 FSS E~ngineer Reviewed By:' *Date:

t (7*2/

Lead FSS Engineer Approved By:

Date:_______

Dismantlement Superintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8131691, AB rooms 309-313, 316, 317 & 350 +40' to +50' Survey Unit

Description:

Operating History: The Auxiliary Building is a reinforced concrete structure that contained the RadWaste processing and supporting systems. The building contained six main elevations. Residual radioactive material was known to be present on all levels of the interior of the building. Operating records and the HSA document several events with the potential for a release of radioactivity inside this structure.

Site Characterization: Direct measurements were made of each of the interior elevation surfaces as well as the exterior surfaces of the structure. These measurements confirmed the presence of plant-derived radionuclides. Direct measurements on the +40' elevation showed a mean gross activity level of 3,288 dpm/100 cm 2 and a maximum value of 24,781 dpm/100 cm 2. Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the referenced survey unit within the interior of the auxiliary building was determined to be a Class 2 area.

HSA Events: HSA Report pg. 63.

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. Direct measurement locations were determined using a random-start, fixed grid pattern and 295.6 m2 were scanned for approximately 41% coverage. Samples of removable contamination were collected at each direct measurement location. The instrumentation used for the survey along with the M1DC values are listed in Tables 2-1 and 2-2 in Attachment 2.

Page 2 of 8 FSS Summary Report F8131691

Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area:

F813 Survey Unit:

Class:

SU Area (m2):

Evaluator:

DCGL (dpm/100 cm 2):

Area Factor:

Design DCGLemc (dpm/100 cm2):

LBGR (dpm/100 cm 2):

Design Sigma (dpm/IOO cm 2):

Type I Error:

Type II Error:

Predominant Nuclide:

Sample Area (m2):

Scan Area (m2):

Scan Coverage (%):

Sign P:

Calculated Relative Shift:

Relative. Shift Used:

N-Value:

Design N-Value + 20%:

Design Min Samples N:

Grid Spacing L:

1691 2

716 D.A.Tallman 43000 N/A N/A 21500 3627 0.05 0.05 Cs-137 51 295.6 41%

1.645 1.645 0.99865 5.9 3

11 14 23 7.1 AB rooms 309-313, 316, 317 & 350 +40' to +50' Structure Surface LTP Table 5-4 Gross Activity DCGL Class 2 Class 2 Default = 50% DCGL Class 2 Class 2 Uses 3.0 if Relative Shift is

>3 NUREG-1575 Table 5-5 Class 2 Class 2 Page 3 of 8 FSS Summary Report F8131691

Survey Results:

A total of 23 direct measurements were made in F8131691. The results including mean, median, standard deviation and range are shown in Table 2. All direct measurements were less than the DCGL. None of the scan measurements indicated areas of elevated activity. Scan activity ranged from 1936 to 18556 dpm/100 cm2, based on a surveyor efficiency of 0.5 and no background subtracted. Samples for removable surface activity were all less than 10% of the DCGL as shown in Table 3. Removable surface activity samples were counted for alpha activity and none was detected at the MDC shown in Table 2-1 of Attachment 2.

Table 2. Direct Measurement Results Measurement ID Gross Activity (dpm/100 cm F8131691-C0001BD 2023 F8131691-CO002BD 2028 F8131691-CO003BD 1816 F8131691-CO004BD 1608 F8131691-CO005BD 1764 F8131691-CO006BD 1426 F8131691-CO007BD 1561 F8131691-CO008BD 2039 F8131691 -CO009BD 1722 F8131691-CO01OBD 1535 F8131691-CO011BD 1950 F8131691-CO012BD 1406 F8131691-CO013BD 1847 F8131691-CO014BD 658 F8131691-CO015BD 1499 F8131691-CO016BD 1406 F8131691-CO017BD 1987 F8131691-CO018BD 1478 F8131691-CO019BD 1380 F8131691 -CO02OBD 1592 F8131691-CO021BD 1473 F8131691-CO022BD 1478 F8131691-CO023BD 1598 Mean:

1621 Median:

1592 Standard Deviation:

307 Range:

658-2039 Page 4 of 8 FSS Summary Report1 F8131691

Table 3. Removable Surface Activity Results Measurement ID Surface Beta Activity (dpm/100 cm 2)

F8131691 C0007SM

-2.24 F8131691CO010SM

-0.95 F8131691C0001SM 4.22 F8131691 C0002SM 30.05 F8131691 C0003SM

-3.53 F8131691C0004SM 0.34 F8131691 C0005SM 0.34 F8131691C0006SM

-3.53 F8131691C0007SM

-0.95 F8131691 C0008SM

-0.95 F8131691 C0009SM 2.93 F8131691CO010SM 0.34 F8131691CO01ISM 18.42 F8131691C0012SM 13.26 F8131691C0013SM

-2.24 F8131691COO14SM

-2.24 F8131691C0015SM 10.68 F8131691C0016SM

-4.82 F8131691C0017SM

-0.95 F8131691C0018SM 0.34 F8131691C0019SM 13.26 F8131691 C0020SM

-4.82 F8131691C0021SM 8.09 F8131691 C0022SM

-4.82 F8131691 C0023SM 2.93 Mean:

2.93 Median:

0.34 Standard Deviation:

8.44 Range:

-4.82 to 30.05 Page 5 of 8 FSS Summary Report F8131691

Survey Unit Data Assessment:

The survey design required 23 direct measurements for the Sign Test. 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 less than the design standard deviation so no additional samples were required.

Page 6 of 8 FSS Summary Report F8131691

Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dpm/100 cm2):

N/A Ambient Background Used (dpm/100 cm 2):

N/A Average Ambient BKG = 0 Actual Direct Measurements (N):

23 Median (dpm/100 cm 2):

1592 Mean (dpm/100 cm2):

1621 Direct Measurement Standard Deviation 307 (dpm/100 cm 2):

Total Standard Deviation (dpm/100 cm2):

307 Based on samples and backgrounds.

Maximum (dpm/100 cm 2):

2039 Material Type:

N/A Background Subtract Not Applied Sign Test Final N Value:

23 S+ Value:

23 Critical Value:

15 Sufficient Samples Collected:

Yes Maximum Value < DCGL:

Yes Median Value < DCGL:

Yes Mean Value < DCGL:

Yes Maximum Value < DCGLemc:

N/A Class 2 Total Standard Deviation <= Sigma:

Yes Pass the Sign Test?

Yes Reject the Null Hypothesis?

Yes Does the Survey Unit Pass All Criteria?

Yes Page 7 of 8 FSS Summary Report F8131691

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 (i.e. the survey unit average activity is less than the DCGL and the EMC criterion has been met), the ALARA criterion has been met.

Changes in Initial Survey Unit Assumptions:

The survey unit was designed as a Class 2 structure 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.

==

Conclusion:==

The FSS of this survey unit was properly designed as a Class 2 survey based on Table 5-4 of the LTP. The required number of direct measurements was made and the scan coverage met the requirement of Table 5-6 of the LTP. No direct measurements exceeded the DCGL of 43000 dpm/100 cm 2 and none of the removable surface activity measurements exceeded 10% of the DCGL. No investigations were required.

The direct 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 F8131691 meets the release criteria of 10CFR20.1402.

Page 8 of 8 FSS Summary Report F813,1691 Maps September 22, 2008 Survey Unit F8131691

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ROOM 317 CIOS:T EXTERIOR L.G EAST AT COL LINE SG

-TI 00 Co DEVELOPED VIEW AT CONTAINMENT LOOKING NOMINALLY NORT4H AUXILIARY BUILDING EL. 40'-0" ROOMS 309-317 & 350 FLOOR, CEILING & WALLS oBETA DIRECT/REMOVABLE I

ACTIVITY MEASUREMENT LOCATIONS SACRAMENTO MUNI'IIPAL FI UTILITY DISTRICT F8131 691 -M2 FILE: 81300(.O5a SHEET 8 9f 9

RC RAYMOND 0

1 2

3 CAE H IE TEA.

0D ii' 311-KEY PLAN ROOM 317 REFLECTED CEILING PLAN ELEV.

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kSJ EL 51)'-0"

-1.. 40'-0"

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'ROOMS

  • ~S UD SACRAMENTO MUNICPA..

UTILITY' DISTRICT AUXILIARY BUILDING EL. 40'-0" 309-317 & 350 FLOOR, CEILING & WALLE BEVA DIRECT/REMOVABLE ACTIVITY MEASUREMENT LOCATIONS F81 31691 -M2 SHEET 9 of 9 R

PC RAYIOND I

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'40*0 AUXILIARY BLDG KEY PLANS ROOM 309 PLAN VIEW ELEV. 40'-0" ELEV LKG NORTH NORTH OF COL 10.3 ROOM 309 REFLECT CLG ELEV. 50'-0>"

ELEV LKG EAST EA3ST OF COL T 3

SCALE M'EIlERS ELEV LKG SOUTH AT COL UNE 10.3 ELEV LKC WEST AT 0CL UE -

(-1)

SSMUIEI LIIiY DISR AUXILIARY BUILDING EL. 40'-0" IROOMS 309-317 & 350 FLOOR, CEILING & WALLS 3

BETA SCAN ACTIVITY MEASUREMENT LOCATIONS

  • "'*PAL iF8131 691 -M3 PL.

F-- 000._-o____

SHEET I_1 f 8 Re RAYMONul

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NO ROOM 310 PLAN VIEW ROOM 310 REFLECTED CEILING PLAN ELEV. 50'--a

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'ROOMS 309-317 & 350 FLOOR, CEILING &

0 smu BETA SCAN WiF ACTIVITY MEASUREMENT LOCATIONS LT DISTRICT F8131691-M3 FL: 8130

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  • SHEET 2 of 8 WALLS RAYMOND.

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/ZZ ROOM 311 ELEV LKG EAST AT COL LiNE I ROOM AT COL. UNE S ER. 49'- 9

( 35 0l00 EL. 40*-0" ROOM 311 ELEV LKG SOUTH AT CO.

LINE 10.3 0

1 2

3 SCALE METERS SýACRAMENTO MUNICIPAL UT'UTt' DISTRICT FiLE:

AUXILIARY BUILDING EL. 40'-0"

)MS 309-317 & 350 FLOOR, CEILING & WALLS BETA SCAN ACTIVITY MEASUREMENT LOCATIONS F81 31 691 -M3 81 3,M)0,05o SHEET 3 of 8 RC RAYMOND

142q COolleqe Ave UP C)

. ~--7 ELEV. 40'-0" KEY PLAN ROOM 312 PLAN VIEW ELEV. 40' RQOM_312 REFLECT CLG ELV. 5O'-O"

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  • 6 SACRAM/ENTO MUNICIPAL UTIL11-Y DISTRICT AUXILIARY BUILDING EL. 40'-0" ROOMS 309-317 & 350 FLOOR, CEILING & Wj BETA SCAN ACTIVITY MEASUREMENT LOCATIONS F81 31691 -M3 RM 312 ELEV LKG EAST INSIDE OF SHOVrER SCALE 14ALLrp

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T CCL UNE 9.7 RM 313 LKG *.W.,EST EAST OF COL S RM 350 LKG EAST

  • RM 350 LKG_WEST WEST OF COL T EAST OF COL I'll 00 At ROOMS 309 I

ACT SACRAMETO MlUNICIPAL

/

UTILITY DISTRICTE 1

JXILIARY BUILDING EL. 40'-0"

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& 350 FLOOR, CEILING &

BETA SCAN IVITY MEASUREMENT LOCATIONS F81 31691 -M3 SHEET 5 of 8 WALLS RAYMCtID 13 7

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CIN 00 0N ljJ ELEV. 40'---0 KEY PLAN 1

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T.-

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BETA SCAN C.

EXT.--

9M PACTIVITY MEASUREMENT LOCATIONS Total -

25. 7 M2 I

2 SACRAMENTO MUINICIPALI TaCA-E 2LTILTf DISTRICT F8 1 31 691 -M3 I.....

I--L: 8--.--0.-5--

SHEET 7 of 8 R

A PAYMOND

0 00 ELEV. 40'-0" KEY PLAN 99H 100 1012 103 104 t05-ji 106 iLL J

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  • SMUD SACRAMENTO MUNICIPAL 3CALE UTILITY DISTRICT METERS AUXILIARY BUILDING EL. 40'-0" ROOMS 309-317 & 350 FLOOR, CEILING & WALLS BETA SCAN ACTIVITY MEASUREMENT LOCATIONS F81531691 -M3 FLE: 8130C-U.05O SHEET 8 of 8 RC RAYMOND Instrumentation September 22, 2008 Survey Unit F8131691

Table 2-1. Survey Unit Instrumentation Instrument Detector MDC Static MDC Scan Model; Serial No.

Model; Serial No.

(dpm/100 cm 2 )

(dpm/100 cm 2)

M2350; 203481 43-68B; 148629 M2350; 149794 43-68/5B; 149103 433 1033 M2350; 180738 43-68/5B; 148942 M2350; 142499 43-37; 148502 NA 616 Tennelec; 0401171 N/A 6 dpm a, 12 dpmf3 N/A Table 2-2. Investigation Criteria and DCGL Value Parameter Value cm2)

(dpm/100 cz Investigation Criteria - Direct 43000 Investigation Criteria - Scan 43000 DCGLw 43000 DCGLEMC N/A Page 2 of 2 Att. 2 Instrumentation F8131691 Investigation September 22, 2008 Survey Unit F8131691 (none required)

Data Assessment September 22, 2008 Survey Unit F8131691

(tD t'J 0

V) 00 U)

F81 31691 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpm/1 00cm2 2,500 2,000 IE 1592 1,500 1,000 500 0

0 20 40 60 80 100 Percentile I

  • Direct Measurements (dpm/100cm2) -

median -

75th Percentile....

50th Percentile

0(

0 F8131691 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpmll00cm=

0 w

C\\

('30\\

3000 ST 2501b EaC 0020009 E 1500d 1000 500 0

at a

at a

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a a

a 4 2541 0

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0 00 0

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1621 ai

=

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=

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0 0

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0 0

0 0

0 0

0 0

a 0 00 0 0

0 a cc0 0

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UU U

U UU0U UU UU UUU U UU U UU.

Measurement Locations o

Gross Activity -

Average -

"+3StDev" -

"-3StDev

(D~

00 w-h F81 31691 Gross Activity Frequency Plot DCGL = 43000 dpmi1 00cm2 I1)

C 0i) 2-j 11 10 9

8 7

6 5

4

ý3 2

1-0 -

CO CO 0)

(9)

Bins - Upper End Value (dpmt/1 00cm2)

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