ML091000379

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Final Status Survey Summary Report 10/31/08, AB +50/+60 Rm 309-313, 316, 317, & 350, Survey Unit F8131692
ML091000379
Person / Time
Site: Rancho Seco
Issue date: 11/03/2008
From: Tallman D
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
Shared Package
ML090830613 List: ... further results
References
DPG 09-097, F8131692
Download: ML091000379 (36)
v • d • e


Text

Rancho Seco Final Status Survey Summary Report October 31, 2008 AB +50'/+60' Rm 309-313, 316, 317, & 350 Survey Unit F8131692 Prepared By: Dan A. Tallman FSS Eng'*eer Date: November 3, 2008 ReviewedBy:0 Lead FSS Engineer Approved By:

7

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Date:

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Date:

3--3-07 Radiological Dismantlementi

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8131692, AB +50'/+60' Rm 309-313, 316, 317, & 350 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. The section of survey unit 813169 located above the drop ceiling at the +50' elevation exhibited no areas of elevated activity nor the exposure to radioactive material movement exiting in the areas located below the +50'.

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 survey unit, as described within the interior of the auxiliary building was determined to be a Class 3 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 randomly determined and 154 m2 were scanned for approximately 26%

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 8 FSS Summary Report F8131692

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 cm 2):

LBGR (dpm/100 cm2):

Design Sigma (dpm/100 cm2):

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 Snacina L:

1692 3

589 D.A.Tallman 43000 N/A N/A 21500 3627 0.05 0.05 Cs-137 42 154 26%

1.645 1.645 0.99865 5.9 3

11 14 14 N/A AB +50'/+60' Rm 309-313, 316, 317, & 350 Structure Surface LTP Table 5-4 Gross Activity DCGL Class 3 Class 3 Default = 50% DCGL Class 3 1 Class 3 Uses 3.0 if Relative Shift is

>3 NUREG-1575 Table 5-5 Class 3 Class 3 J

h Page 3 of 8 FSS Summary Report F8131692

Survey Results:

A total of 14 direct measurements were made in F8131692. 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 3389 to 12566 dpm/100 cm 2, 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 )

F8131692-C0OO BD 2059 F8131692-CO002BD 1956 F8131692-CO003BD 2054 F8131692-CO004BD 2096 F8131692-CO005BD 2189 F8131692-CO006BD 2163 F8131692-CO007BD 1961 F8131692-Co008BD 1971 F8131692-CO009BD 2122 F8131692-CO01OBD 2137 F8131692-Co011BD 3211 F8131692-CO012BD 3143 F8131692-CO013BD 2039 F8131692-CO014BD 2085 Mean:

2228 Median:

2090 Standard Deviation:

409 Range:

1956-3211 Page 4 of 8 FSS Summary Report F8131692

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

F8131692C0001SM F8131692C0002SM F8131692C0003SM F8131692C0004SM F8131692C0005SM F8131692CO006SM F8131692C0007SM F8131692C0008SM F8131692C0009SM F8131692C0010SM F8131692C001 1 SM F8131692C0012SM F8131692C0013SM F8131692C0014SM Mean:

Median:

Standard Deviation:

Range:

-6.11 0.34 0.34 1.64

-2.24

-0.95

-0.95 0.34 1.64 6.8 9.38 18.42 0.34 18.42 3.1 0.34 7.17

-6.11 to 18.42 Page 5 of 8 FSS Summary Report F8131692

Survey Unit Data Assessment:

The survey design required 14 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 F8131692

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

N/A Ambient Background Used (dpm/100 cm2):

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

14 Median (dpm/100 cm 2):

2090 Mean (dpm/100 cm 2):

2228 Direct Measurement Standard Deviation 409 (dpm/100 cm 2):

Total Standard Deviation (dpm/100 cm 2):

409 Based on samples and backgrounds.

Maximum (dpm/100 cm 2):

3211 Material Type:

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

14 S+ Value:

14 Critical Value:

10 Sufficient Samples Collected:

Yes Maximum Value < DCGL:

Yes Median Value < DCGL:

Yes Mean Value < DCGL:

Yes Maximum Value < DCGLemc:

N/A Class 3 Total Standard Deviation <= Sigma:

Yes Pass the Sign Test?

Yes Reject the Null Hypothesis?

Yes Does the Survey Unit Pass All Criteria?

Yes I Page 7 of 8 FSS Summary Report F8131692

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 3 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 3 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 F8131692 meets-the release criteria of 10CFR20.1402.

Page 8 of 8 FSS Summary Report F8131692 Maps October 31, 2008 Survey Unit F8131692

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  • 4UICIPAL UTILITY DISTRICT AUXILIARY BUILDING EL. 50"-0" ROOMS 309-317 & 350 ABOVE DROP CEILINGS BETA SCAN ACTIVITY MEASUREMENT LOCATIONS F81 31 692-M3 FILE: 81 00.05 SHEET 6 of 6 RC RAfYMON SC-^LE IMP TER' Instrumentation October 31, 2008 Survey Unit F8131692

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

Model; Serial No.

(dpm/100 cm2 )

(dpm/100 cm2 )

M2350; 193715 43-68B; 148630 433 1033 Tennelec; 0401171 N/A 6 dpm a, 12 dpm 3 N/A Table 2-2. Investigation Criteria and DCGL Value ParameterVau (dpm/100 cm 2)

Investigation Criteria - Direct 21500 Investigation Criteria - Scan 43000 DCGLw 43000 DCGLEMC N/A Page 2 of 2 Att. 2 Instrumentation F8131692 Investigation October 31, 2008 Survey Unit F8131692 (none required)

Page I of I Att. 3 Investigation F8131692 Data Assessment October 31, 2008 Survey Unit F8131692

CDF8131692 Gross Activity Sample Results Quantile Plot 0

DCGL = 43000 dpm/1 00cm2 3,500 3,000 7I I

2,500

-2090 CD1,000 500 -

.-.P 0

0 20 40 60 80 100 SPercentile Direct Measurements (dpm/100cm2) median -

- - 75th Percentile -

50th Percentile a.'

t'J

(D 0

F8131692 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpmll00cm=

0 CnW (a3 OCD Ca 4000 3500 -

E 3000-2500-Ea2000 -

150oo-1000 500-0 a

a -

a -

a a

a a

0 o

0 0

0 00 3454 2228 1001 1

I I.

r

'4 V 7 0

N t

0 0

0 N 4 4'

0 o

o 0

0 0

0 0

0 V-r r

0 o

a 0

a 0

0 0

0 0

0 0

0 0

Measuremet0 0

0 0

0 0

UUU UUUUU U

U U

U U

Measurement Locations 00 OJ r'J i

o Gross Activity -

Average -

"+3StDev" -

"-3StDev'

Cl) 00 WN F8131692 Gross Activity Frequency Plot DCGL = 43000 dpm/l 00cm2 DI 0.

12 11 10 9

8 7

6 5

4 3

2 1

0 C\\I (f')

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

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