ML082620155

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Final Status Survey Summary Report, June 30, 2008, East Heat Removal Cooler Room Between Columns 10.3 and 9.7, Room 051 Floor and Upper Walls and Ceiling Survey Unit F8130701
ML082620155
Person / Time
Site: Rancho Seco
Issue date: 07/29/2008
From: Stein M
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
References
MPC&D 08-064 F8130701
Download: ML082620155 (27)
v • d • e


Text

Rancho Seco Final Status Survey Summary Report June 30, 2008 East Heat Removal Cooler Room Between Columns 10.3 and 9.7, Room 051 Upper Walls and Ceiling Survey Unit F8130701 Prepared By:

Date:

i

/20 SS Engineer Reviewed By.'

oiJ f

-J

-I ate:-7 -3(C Lead FSS Engineer Approved By:

7 Date: 7" "1 -

Dismantlement Superintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

'REPORT Survey Unit:

F8130701, East Heat Removal Cooler Room Between Columns 10.3 and 9.7, Room 051 Upper Walls and Ceiling Survey Unit

Description:

Operating History: The East 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 dpm/100 cm2 and a maximum value of 10,080,000 dpm/100 cm 2.

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), and Class 2 for the upper walls and ceiling. However, inside the East 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 East Heat Removal Cooler Room Between Columns 10.3 and 9.7, Room 051.

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 202 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 8 FSS Summary Report FF8130701

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

F813 Survey Unit:

Class:

SU Area (m2):

Evaluator:

DCGL (dpm/1 00 cm'):

Area Factor:

Design DCGLemc (dpm/100 cm 2):

LBGR (dpm/100 cm2):

Design Sigma (dpm/100 cm 2):

Type I Error:

Type.11 Error:

Predominant Nuclide:

Sample Area (m2):

Scan Area (m2):

Scan Coverage (%):

Zl.,

Zl.[P :

Sign P:

Calculated Relative Shift:

Relative Shift Used:

N-Value:

Design N-Value + 20%:

Design Min Samples N:

Grid Spacing L:

0701 I

202 Michael Stein 43000 3.5 152301 21500 12035 0.05 0.05 Cs-137 7

202 100%

1.645 1.645 0.955435 1.7 1.7 14 17 29 2.6 East Heat Removal Cooler Room Between Columns 10.3 and 9.7, Room 051 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 1 Class 1 Page 3 of 8 FSS Summary Report F8130701

Survey Results:

A total of 29 direct measurements were made in F8130701. The results including mean, median, standard deviation and range are shown in Table 2. All of the direct measurements except for COO1 7BD were less than the DCGL. None of the scan measurements indicated areas of elevated activity. Scan activity ranged from 2,167 to 137,563 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)

F8130701-COOOIBD F8130701-CO002BD F8130701-CO003BD F8130701-C0004BD F8130701-CO005BD F8130701-CO006BD F8130701-CO007BD F8130701 -CO008BD F8130701-CO009BD F8130701--Co010 BD F8130701 -C0011IBD F8130701-CO012BD F8130701-CO013BD F8130701-CO014BD F8130701-Co015BD F8130701-CO016BD F8130701-CO017BD F8130701-CO018BD F8130701-CO019BD F8130701-CO02OBD F8130701 -C0021 BD F8130701-CO022BD F8130701-CO023BD F8130701-CO024BD F8130701-CO025BD F8130701-CO026BD F8130701-CO027BD F8130701-CO028BD F8130701 -CO029BD Mean:

Median:

Standard Deviation:

Ran qe:

1738 1670 1717 1551 1603 1146 1727 1852 1644 1712 1089 1286 1795 1743 1644 986 47614 1546 1349 1385 1318 970 954 1675 2168 7807 1509 1743 1904 3340 1644 8600 954-47614 Ranqe:

954-47614 Page 4 of 8 FSS Summary Report F8130701

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

F8130701CO000ISM F8130701 C0002SM F8130701 C0003SM F8130701 C0004SM F8130701CO005SM F8130701C0006SM F8130701 C0007SM F8130701CO008SM F8130701 C0009SM F8130701Co010SM F8130701C0011SM F8130701Co012SM F8130701Co013SM F8130701 C0014SM F8130701CO015SM F8130701CO016SM F8130701CO017SM F8130701C0018SM F8130701Co019SM F8130701CO020SM F8130701 C0021 SM F8130701 C0022SM F8130701CO023SM F8130701C0024SM F8130701C0025SM F8130701C0026SM F8130701C0027SM F8130701C0028SM F8130701C0029SM Mean:

Median:

Standard Deviation:

Range:

5.51 1.64 1.64 2.93

-0.95 4.22

-0.95 0.34

-0.95 0.34 18.42 2.93 2.93 1.64 4.22 4.22 232.8

-0.95

-3.53 9.38

-0.95 2.93

-0.95 6.8 21.01 206.98 4.22 5.51 104.95

.21.94 2.93 58.31

-3.53 to 232.8 Page 5 of 8 FSS Summary Report F8130701

Survey Unit Data Assessment:

The survey design required 29 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 F8130701

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

Ambient Background Used (dpm/IO0 cm2):

Actual Direct Measurements (N):

Median (dpm/100 cm 2):

Mean (dpm/100 cm 2):

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

Total Standard Deviation (dpm/100 cm 2):

Maximum (dpm/100 cm 2 ):

Material Type:

Sign Test Final N Value:

S+ Value:

Critical Value:

Sufficient Samples Collected:

Maximum Value < DCGL:

Median Value < DCGL:

Mean Value < DCGL:

Maximum Value < DCGLemc:

Total Standard Deviation <= Sigma:

Pass the Sign Test?

Reject the Null Hypothesis?

Does the Survey Unit Pass All Criteria?

N/A N/A 29 1644 3340 8600 8600 47614 N/A 29 28 19 Yes Investigate Yes Yes Yes Yes Yes Investigate Investigate Average Ambient BKG = 0 Based on samples and backgrounds.

Background Subtract Not Applied Small Area < 1 m2, Activity 47,614 dpm/100cm2 Class 1 Yes, Passed Sign Test Yes Page 7 of 8 FSS Summary Report F8130701

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. All of the direct measurements except for COO17BD were less than the DCGL of 43000 dpm/100 cm2. 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 F8130701 meets the release criteria of 10CFR20.1402.

Page 8 of 8 FSS Summary Report F8130701 Maps June 30, 2008 Survey Unit F8130701

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

Model; Serial No.

(dpm/100 cmM)

(dpm/100 cm 2 )

M2350; 142514 43-98B; 148639 550 990 M2350; 193700 43-68B; 190294 433 1033 M2350; 149789 43-68B; 161397 433 1033 M2350; 203481 43-68B; 148629 433 1033 M2350; 149789 43-116-1B; 256006 491 13 Juncture 739 13 Juncture M2350; 193700 43-116-1B; 216072 796 3258 Tennelec; 0401171 N/A 5.9 dpm a' N/A 11.7 dpm 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 (dpm/100 cm 2)

Investigation Criteria - Direct 150500 Investigation Criteria - Scan 150500 DCGLw 43000 DCGLEMc 150500 Page 2 -of 2 Att. 2 Instrumentation F8130701 Investigation June 30, 2008 Survey Unit F8130701 (none required)

Data Assessment June 30, 2008 Survey Unit F8130701

CF8130701 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpm/1 00cm2 50,000 z

45,000 40,000 -

35,000 30,000

?X 25,000 -

20,000 -

5,000 0

1644 0

20 40 60 80 100 Percentile Direct Measurements (dpmIl0Ocm2) median

-75th Percentile ---- 50th Percentile w0-C)

F F830701 Gross Activity Sample Results Scatter Plot DCGL 43000 dpmll00cmR 60000 50000 E 40000 30000 2913E E20000

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