ML082620160

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Final Status Survey Summary Report, June 23, 2008, Pump Alley - North of Column 9.7, Walls (Above One Meater) and Ceiling, Sevey Unit F8130431
ML082620160
Person / Time
Site: Rancho Seco
Issue date: 07/29/2008
From: Tallman D
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
References
MPC&D 08-064 F8130431
Download: ML082620160 (28)
v • d • e


Text

Rancho Seco Final Status Survey Summary Report June 23, 2008 Pump Alley - North of column 9.7 walls (above one meter) and ceiling Survey Unit F8130431 Prepared By: Dan A. Tallman Date: June 23, 2008 FSS Enginier Reviewed By:

Date: "t i0b Lead FSS.Engineer Approved By:

Date:__________

Dismantlement Ouperintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8130431, Pump Alley North of column 9.7 walls (above one meter) and ceiling 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 -29' elevation showed a mean gross activity level of 544,756 dpm/l100 cm2 and a maximum value of 11,370,000 dpm/100 cm 2..Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the upper walls and ceiling of Pump Alley within the interior of the auxiliary building was determined to be a Class 1 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 301.1 m2 were scanned for 100% coverage. Samples of removable contamination were collected at each direct measurement location. The instrumentation used for the survey along with the MDC values are listed in Tables 2-1 and 2-2 in Attachment 2.

Page 2 of 9 FSS Summary Report F8130431

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

F813 Survey Unit:

Class:

SU Area (m2):

Evaluator:

DCGL (dpmI1O0 cm2):

Area Factor:

Design DCGLemc (dpm/100 cm2):

LBGR (dpm/100 cm 2):

Design Sigma (dpm/100 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:

0431 1

301.1 D.A.Tallman 43000 3.5 154566 21500 10204 0.05 0.05 Cs-137 6.84 301.1 100%

1.645 1.645 0.97725 2.1 2.1 12 15 44 2.6 Pump Alley North of column 9.7 walls (above one meter) and ceiling Structure Surface LTP Table 5-4 Gross Activity DCGL Class 1 Class 1 Default = 50% DCGL Class 1 Class 1 Uses 3.0 if Relative Shift is

>3 NUREG-1575 Table 5-5 Class 1 Class 1 Page 3 of 9 FSS Summary Report F8130431

Survey Results:

A total of 47 direct measurements were made in F8130431. 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 1.895 to 35630 dpm/100 cm 2, based on a surveyor efficiency of 0.5 and no background subtracted. ISOCS scan activity on the walls and ceiling ranged from 2727 to 25855 dpm/100cm 2 for Cs-137 and all Co-60 scans <MDA.

Safnples 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.

Page 4 of 9 FSS Summary Report F8130431

Table 2. Direct Measurement Results Measurement ID Gross Activit (dpm/100 cm F8130431 -COOO1 BD

.F8130431-CO002BD F8130431 -CO003BD F8130431-CO004BD F8130431-CO005BD F8130431-CO006BD F8130431-CO007BD F8130431-CO008BD F8130431-CO009BD F8130431-CO01OBD F8130431-CO011BD F8130431-CO012BD F8130431-CO013BD F8130431-CO014BD F8130431-CO015BD F8130431-CO016BD F8130431-CO017BD F8130431-C0018BD F8130431-CO019BD F8130431-CO02OBD F8130431-C0021 BD F8130431-CO022BD F8130431-CO023BD F8130431 -CO024BD F8130431-CO025BD F8130431-CO026BD F8130431-CO027BD F8130431-C0028BD F8130431-CO029BD F8130431-CO03OBD F8130431-C0031 BD F8130431 -CO032BD F8130431 -CO033BD F8130431 -C0034BD F8130431-C0035BD F8130431-C0036BD F8130431-C0037BD F8130431-C0038BD F8130431-CO039BD F8130431-CO04OBD F8130431-C0041 BD F8130431-C0042BD F8130431 -C0043BD F8130431 -C0044BD F8130431-CO045BD F8130431-C0046BD F8130431-C0047BD Mean:

Median:

Standard Deviation:

Range:

2132 1774 1556.

1987 1292 1707 3284 2298 1587 1525 1686 1577 1592 1499 1489 1499 1515 1390 1421 1375 1240 1100 1255 1349 1131 1515 1354 1286 1359 1582 1281 1255 1504 1515 1359 1769 1572 1432 2106 1707 1572 1567 1484 1556 1587 1473 1458 1565 1515 352 1100-3284 Page 5 of 9 FSS Summary Report F8130431

Table 3. Removable Surface Activity Results

  • 1*

Measurement ID Surface Beta Activity (dpm/100 cm 2)

.4-F8130431C001SM F8130431 C002SM F8130431 C003SM F8130431CO04SM F8130431 C005SM F8130431 C006SM F8130431CO07SM F8130431 C008SM F8130431 C009SM F8130431C010SM F8130431 C011 SM F8130431C012SM F8130431C013SM F8130431C014SM F8130431C015SM F8130431CO16SM F8130431C017SM F8130431C018SM F8130431C019SM F8130431 C020SM F8130431 C021SM F8130431 C022SM F8130431 C023SM F8130431 C024SM F8130431 C025SM F8130431 C026SM F81 30431 C027SM F8130431 C028SM F8130431 C029SM F8130431 C030SM F8130431C031 SM F8130431C032SM F8130431CO33SM F8130431 C034SM, F8130431 C035SM F8130431 C036SM F8130431 C037SM F8130431 C038SM F8130431 C039SM F8130431 CO40SM F8130431 C041SM F8130431 C042SM F8130431 C043SM F8130431 C044SM F8130431 C045SM F8130431 C046SM F8130431C047SM Mean:

Median:

Standard Deviation:

Range:

11.97 9.38 0.34 9.38 2:93

-4.82 41.67 79.12 18.42 8.09

-3.53 23.59

-0.95 0.34 2.93

-2.24 1.64

-0.95 8.09 1.64 4.22

-0.95 0.34 17.13 17.13 5.51 8.09 1.64 0.34

-0.95 8.09 1.64

-0.95 39.09 2.93 11.97 39.09 1.64 58.46 9.38

-2.24

-3.53

-2.24

-3.53

-0.95

-4.82

-2.24 8.75 1.64 17.04

-4.82 to 79.12 Page 6 of 9 FSS Summary Report F8130431

Survey Unit Data Assessment:

The survey design required 47 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 7 of 9 FSS Summary Report F8130431

Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dpm/100 cm 2):

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

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

47 Median (dpm/100 cm2):

1515 Mean (dpm/100 cm2 ):

15.65 Direct Measurement Standard Deviation 352 (dpm/100 cm2):

Total Standard Deviation (dpm/ 00 cm2):

352 Based on samples and backgrounds.

Maximum (dpm/100 cm2):

.3284 Material Type:

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

47 S+ Value:

47 Critical Value:

29 Sufficient Samples Collected:

Yes Maximum Value < DCGL:

Yes Median Value < DCGL:

Yes Mean Value < DCGL:.

Yes.

Maximum Value < DCGLemc:

Yes Class 1 Total Standard Deviation <= Sigma:

Yes Pass the Sign Test?

Yes Reject the Null Hypothesis?

Yes Does the Survey Unit Pass All Criteria?

Yes Page 8 of 9 FSS Summary Report F8130431

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 1 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. Therefore the EMC criterion was met.

==

Conclusion:==

The FSS of this survey unit was properly designed as a Class 1 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 F8130431 meets the release criteria of 10CFR20.1402.

Page 9 of 9 FSS Summary Report F8130431 Maps June 23, 2008 Survey Unit F8130431

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BLDG. PUMP ALLEY NORTH OF COLUMN LINE 9.7 -

BETA DIRECT/LOOSE SURFACE ACTIVITY MEASUREMENT LOCATIONS F81 30431 -M2 DWG: 81300.02d SHEET 2 of 4 T C HILL

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= 1-a' METER SCALE 0

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  • smun SACRAMENTO MUNICIPAL UTILITY DISTRICT AUX.

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PUMP ALLEY NORTH OF COLUMN LINE 9.7 -

BETA. DIRECT/LOOSE SURFACE ACTIVITY MEASUREMENT LOCATIONS F81 30431 -M2 IDW: 81300.02d SHEET 3 of 4 T C HILL

ELEV. -Z-O' 0

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ELEV. -20'-0" i-Metmrhio" ELEV'. -25"-0" NORTH WALL ELEVATION ELEV. (T ShEICIS Wall Plo~

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BETA DIRECT/LOOSE ACTIVITY MEASUREMENT LOCATIONS F81 30431 -M2 d

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BLDG.

PUMP ALLEY NORTH OF COLUMN LINE 9.7 -

CEILING GAMMA SCAN LOCATIONS

- F81,30431-M3 1,300.02d "SHEET 1-of4T DWG: 8 C HILL DWG: 81300.02d SHEET I-of 4 TC HILL

CD 00 00 0

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METER SCALE 0

1 2

3

  • SMUD SACRAMENTO MUNICIPAL UTILITY DISTRICT AUX.

BLDG. PUMP ALLEY NORTH OF COLUMN LINE 9.7 -

EAST GAMMA SCAN LOCATIONS F8130431 -M3 DWG: 81300.02d SHEET 2 of 4 WALL T C HILL

0 Gamma Scan Centered at One Meter will be Evaluated in F8130441 WEST WALI ELEVATION Gamma Scan Field of View 12.56 mn 2

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BLDG. PUMP ALLEY NORTH OF COLUMN LINE 9'7 -

NORTH AND WEST WALL GAMMA SCAN LOCATIONS F81 30431 -M3 SHEET 3 of 4

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1 2

3 SACRAMENTO MUNICIPAL UTILITY DISTRICT AUX.

BLDG. PUMP ALLEY NORTH OF COLUMN LINE 9.7 JUNCTURE BETA SCAN LOCATIONS F8130431 -M4 300.02d SHEET 2 of 2 DWG: 81 C HILL T

Instrumentation June 23, 2008 Survey Unit F8130431

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; 203486 43-68B; 161400 433 1033 M2350; 149789 43-68B; 161397 M2350; 149789 43-116-1B; 256006 796' 3258' Tennelec; 0401171

.N/A 6 dpm a, 12 dpm 13 N/A Juncture - concrete Instrument Detector MDC' Model; Serial No.

Model; Serial No.

(dpm/100 cm 2)

ISOCS 1983920 1370 (Co60) 1320 (Cs137) 3920_2mconcrete geometry 12 m2 FOV Table 2-2. Investigation Criteria and DCGL Value Parameter Val ue cm2)

(dpm/100 c2 Investigation Criteria - Direct 154566 Investigation Criteria - Scan 154566 DCGLW 43000 DCGLEMC 154566 Value (dpm/100 cm2)

To detect a I m hot spot at the EMC riterion within the detector field of view 63,300 dpm/100 cm2 Cs-137 21,275 dpm/100 cm 2 Co-60 1 3920 2m-concrete geometry 12 m2 FOV 2 Investigation Level set to 43,000 dpm/1OOcm 2 Cs-137, ND Co-60 for investigation survey instructions.

Page 2 of 2 Att. 2 Instrumentation F8130431 Investigation June 23, 2008 Survey Unit F8130431 (none required)

Data Assessment June 23, 2008 Survey Unit F8130431

CD2 00 C0 F81 30431 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpm/1 00cm2 I

3,500 3,000 2,500 2,000 1,500 1,000 500 0

1515

-t.

0 20 40 60 Percentile 80 100 I

  • Direct Measurements (dpm/100cm2)

-median

- - 75th Percentile ----

50th Percentile i

0*

F8130431 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpmll00cm' 3500 0

3000 E 2500 a

2621 u2500 C0 0

0 0

2000 0

CL 0

0 0

0 0

V0QQ 0-

._.Oý

-0 O___

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0 10 I0 0

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0 0000 t*O 0t 00r O00000000tJ00000 00 Meas urement Locations

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1:: :: : :. :: ::: : ::: :
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41, 0

Ab F8130431 Gross Activity Frequency Plot DCGL = 43000 dpm/1 00cm2 A

CD 00 0

4A a-L.o CI 28 26 24 22 20 18 16 14 12 10 8

6 4

2 0

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I-O

('4 Cl Cl Cr)

Bins - Upper End Value (dprm/100cm2)

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