ML082620079

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Final Status Survey Summary Report June 27, 2008 West Heat Removal Cooler Room East of Column N, Room 052 Upper Walls and Ceiling Survey Unit F8130771
ML082620079
Person / Time
Site: Rancho Seco
Issue date: 06/27/2008
From: Stein M
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
References
F8130771, MPC&D 08-064
Download: ML082620079 (35)
v • d • e


Text

Rancho Seco Final Status Survey Summary Report June 27, 2008 West Heat Removal Cooler Room East of Column N, Room 052 Upper Walls and Ceiling Survey Unit F8130771 Prepared B y:

FSS Engineer Date: 6zo2 Reviewed By:

j d.a jjate:

-713 10*

Lead FS Engineer Approved By:

?7 S

reDate:

Dismantlement Superintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8130771, West Heat Removal Cooler Room East of Column N, Room 052 Upper Walls and Ceiling Survey Unit

Description:

Operating History: The West Heat Removal Cooler Room is located on the -20' elevation of the Auxiliary Building. The Auxiliary Building is a reinforced concrete structure that, during power operations, contained the Radwaste processing and supporting systems.

The building has six main elevations. Residual levels of surface radioactivity were detected on all interior elevations 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 taken on each interior elevation of the Auxiliary Building. These measurements confirmed the presence of plant-derived radionuclides. Direct measurements taken on the -20' elevation, showed a mean gross, activity level of 247,831 dpmr/100 cm2 and a maximum value of 10,080,000 dpm/100 cm2.

Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the interior surfaces of the Auxiliary Building were determined primarily to be a Class 1 for the floors and lower walls (bottom 2 meters of the walls), andClass 2 for the upper walls and ceiling. However, inside the West Heat Removal Cooler Room there were a number of areas on the upper walls and ceiling where the gross surface activity levels were higher than the DCGL prior to remediation. Therefore, a Class 1 final status survey was performed on the upper walls and ceiling of the West Heat Removal Cooler Room East of Column N, Room 052.

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 214 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

-F8130771

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

Survey Unit:

Class:

SU Area (m):

Evaluator:

DCGL (dpm/100 cm 2):

Area Factor:

Design DCGLemc (dpm/100 cm2):

LBGR (dpm/I O0 cm 2):

Design Sigma (dpm/100 cm 2):

Type I Error:

Type II Error:

Predominant Nuclide:

Sample Area (m2):

Scan Area (M2):

Scan Coverage (%):

Zl-, :

ZI_[0 :

Sign P:

Calculated Relative Shift:

Relative Shift Used:

N-Value:

Design N-Value + 20%:

Design Min Samples N:

Grid Spacing L:

F813 0771 1

214 Michael Stein 43000 3.5 154800 21500 12035 0.05 0.05 Cs-137 6.9 214 100%

1.645 1.645 0.955435 1.7 1.7 14 17 31 2.6 West Heat Removal Cooler Room East of Column N, Room 052 Upper Walls 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 I Class 1 Page 3 of 9 FSS Summary Report F8130771

Survey Results:

A total of 31 direct measurements were made in F8130771. 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. Beta scan activity ranged from 2,274 to 34,941 dpm/100 cm 2, based on a surveyor efficiency of 0.5 and no background subtracted. Gamma scan activity ranged from 16,049 to 47,679 dpm/100 cm 2 Cs-137. The MDCs for the gamma scan measurements were 4,840 to 5,230 dpm/100 cm 2 for Co-60 and 4,390 to 8,670 dpm/100 cm 2 for Cs-137. Scan measurement locations for both beta and gamma emissions are identified in Attachment 1 of this report. 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.

Table 2. Direct Measurement Results Measurement ID Gross Activity (dpm/100 cm)

F8130771-C0001BD 1525 F8130771-CO002BD 1805 F8130771-CO003BD 1764 F8130771-CO004BD 1240 F8130771-C0005BD 1867 F8130771-CO006BD 1670 F8130771-CO007BD 1639 F8130771-CO008BD 1738 F8130771 -CO009BD 1888 F8130771-CO010BD 1069 F8130771-CO011BD 1131 F8130771-CO012BD 1857 F8130771-Co013BD 1582 F8130771-Co014BD 1001 F8130771-Co015BD 1733 F8130771-CO016BD 1561 F8130771-CO017BD 1447 F8130771-CO018BD 1644 F8130771-C0019BD 1867 F8130771 -C0020BD 1535 F8130771-C0021BD 3927 F8130771-CO022BD 1432 F8130771-CO023BD 1515 F8130771-CO024BD 1416 F8130771-CO025BD 1364 F8130771-CO026BD 1660 F8130771-C0027BD 1494 F8130771-C0028BD 1442 F8130771-C0029BD 1660 F8130771-CO030BD 1406 F8130771-CO031BD 1369 Page 4 of 9 FSS Summary Report F8130771

Mean:

1621 Median:

1561 Standard Deviation:

486 Range:

1001 -3927 Page 5 of 9 FSS Summary Report F8130771

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

F8130771 C0001 SM F8130771 C0002SM F8130771 C0003SM F8130771C0004SM F8130771 C0005SM F8130771 C0006SM F8130771 C0007SM F8130771 C0008SM F8130771 C0009SM F8130771Co010SM F8130771C0011SM F8130771CO012SM F8130771CO013SM F8130771CO014SM F8130771Co015SM F8130771Co01 6SM F8130771CO017SM F8130771CO018SM F8130771CO019SM F8130771 C0020SM F8130771 C0021 SM F8130771 C0022SM F8130771 C0023SM F8130771 C0024SM F8130771 C0025SM F8130771 C0026SM F8130771 C0027SM F8130771CO028SM F8130771CO029SM F8130771 C0030SM F8130771 C0031 SM Mean:

Median:

Standard Deviation:

Range:

-2.24 1.64

-3.53

-4.82

-2.24

-2.24

-0.95 8.09 4.22

-3.53

-3.53

-0.95

-0.95

-2.24 0.34

-4.82 2.93 2.93 0.34 18.42 44.25 4.22 5.51

-0.95 8.09 4.22 2.93 1.64 2.93 4.22

-0.95 2.68 0.34 9.05

-4.82 to 44.25 Page 6 of 9 FSS Summary Report F8130771

Survey Unit Data Assessment:

The survey design required 31 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 F8130771

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

N/A Ambient Background Used (dpmIOO cm2):

N/A Average Ambient BKG 0

Actual Direct Measurements (N):

31 Median (dpm/100 cm2):

1561 Mean (dpm/100 cm 2):

1621 Direct Measurement Standard Deviation 486 (dpm/100 cm2):

Total Standard Deviation (dpm/100 cm 2):

486 Based on samples and backgrounds.

Maximum (dpm/100 cm2):

3927 Material Type:

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

31 S+ Value:

31 Critical Value:

20 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 F8130771

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.

==

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 F8130771 meets the release criteria of 10CFR20.1402.

Page 9 of 9 FSS Summary Report F8130771

Attachment I Maps June 27, 2008 Survey Unit F8130771

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Instrumentation I

June 27, 2008 Survey Unit F8130771

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; 180733 43-98B; 148638 1400 2520 M2350; 193715 43-68B; 160703 433 1033 M2350; 180738 43-68/5B; 148942 433 1033 M2350; 180738 43-116-1B; 216073 796 3258 Tennelec; 0401171 N/A 5.9 dpm a, N/A 11.7 dpm J3 8670 Cs-137 InSpector 1000 10054579 N/A 5230 Co-13 5230 Co-60 The scan and static MDC's provided represent the most conservative MDC values for the survey conducted.

Table 2-2. Investigation Criteria and DCGL Value Parameter (dpmnlOO cm2)

Investigation Criteria - Direct 154800 Investigation Criteria - Scan 154800 DCGLW 43000 DCGLEMC 154800 Page 2 of 2 Att. 2 Instrumentation F8130771 Investigation June 27, 2008 Survey Unit F8130771 (none required)

Data Assessment June 27, 2008 Survey Unit F8130771

F8130771 Gross Activity Sample Results Quantile Plot DCGL 43000 dpm/1 00cm2 4,500 4,000 3,500 3,000 2,500 -

i 0462,OOG00

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0 F8130771 Gross Activity Sample Results Scatter Plot DCGL 43000 dpmlO00cm2 4500 4000 0

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a a a a -

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-2500

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1 1

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1 0

9 8

7 6

5 4

3 2

1 0

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