ML081610160

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Final Status Survey Summary Report, March 3, 2008, Reactor Coolant Drain Tank (V-600) Room (Upper), Survey Unit F8130061
ML081610160
Person / Time
Site: Rancho Seco
Issue date: 03/03/2008
From: Tallman D
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
References
F8130061
Download: ML081610160 (34)
v • d • e


Text

Rancho Seco Final Status Survey Summary Report March 3, 2008 Reactor Coolant Drain Tank (V-600) Room Upper)

Survey Unit F8130061 Prepared By: Dan A. Tallman Date: March 3, 2008 FSS e.

Reviewed By:

Date:

Lead PSEngineer Approved By:

Date:

-0 Dismantlement Superintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8130061, Reactor Coolant Drain Tank (V-600) Room (Upper)

Survey Unit

Description:

Operating History: The Auxiliary Building, a reinforced concrete structure, 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 -47' elevation showed a mean gross activity level of 320,071 dpm/ 100 cm2 and a maximum value of 5,720,000 dpmrl00 cml. Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the upper walls and ceiling of the Reactor Coolant Drain Tank (V-600) Room of the auxiliary building was determined to be a Class 1 survey unit.

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 302 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 P FSS Summary Report F8130061

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

F813 Survey Unit:

Class:

SU Area (ml):

Evaluator:

DCGL (dpm/100 cm 2):

Area Factor:

Design DCGLemc (dpm/100 cm 2):

LBGR (dpm/100cm2 ):

Design Sigma (dpm/100 cm2):

Type I Error:

Type II Error:

Predominant Nuclide:

Sample Area (m2):

Scan Area (M2):

Scan Coverage (%):

ZlIa :

Zl-0 :

Sign P:

Calculated Relative Shift:

Relative Shift Used:

N-Value:

Design N-Value + 20%:

Design Min Samples N:

Grid Spacing L:

0061 1

302 D.A.Tallman 43000 3.5 154800 21500 9976 0.05 0.05 Cs-137 6.86 302 100%

1.645 1.645 0.97725 2.1 2.1 12 15 44 2.6 Reactor Coolant Drain Tank (V-600) Room (Upper)

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 F8130061

Survey Results:

A total of 44 direct measurements were made in F8130061. The results including mean, median, standard deviation and range are shown in Table 2. All direct measurements were less than the DCGL. Two of the scan measurements indicated areas of elevated activity. Scan activity ranged from 767 to 107627 dpm/l100 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.

Page 4 of 8 FSS Summary Report F8130061

Table 2. Direct Measurement Results Measurement ID Gross Activity (dpm/100 cm F8130061-COOOIBD F8130061 -CO002BD F8130061-CO003BD F8130061-CO004BD F8130061-COOO5BD F8130061-C0006BD F8130061 -CO007BD F8130061-C0008BD F8130061-CO009BD F8130061-CO01OBD F8130061-CO011BD F8130061-Co012BD F8130061-CO013BD F8130061-CO014BD F8130061-CO015BD F8130061-Co016BD F8130061-CO017BD F8130061-CO018BD F8130061-Co019BD F8130061-CO020BD F8130061-CO021BD F8130061-CO022BD F8130061-CO023BD F8130061-CO024BD F8130061 -CO025BD F8130061 -CO026BD F8130061-CO027BD F8130061-CO028BD F8130061-CO029BD F8130061 -CO03OBD F8130061-C0031BD F8130061 -CO032BD F8130061 -C0033BD F8130061-CO034BD F8130061-CO035BD F8130061-MOO36BD

'F8130061-MOO37BD F8130061-MO038BD F8130061-MOO39BD F8130061-MO04OBD F8130061-M0041BD F8130061 -M0042BD F8130061 -M0043BD F8130061-MOO44BD Mean:

Median:

Standard Deviation:

Range:

1655 1919 1987 1655 2153 2324 2770 2454 2786 2422 2640 2723 2334 2526 4046 2713 2220 2386 3050 3003 2682 3107 1764 1624 2967 2422 2044 4373 2090 1909 1982 2391 1209 1535 1976 575 615 1089 1390 775 671 652 886 843 2076 2122 869 575-4373 Page 5 of 8 FSS Summary Report F8130061

Table 3. Removable Surface Activity Results Measurement ID Surface Beta Activity (dpm/100 cm2)

F8130061 C0001 SM F8130061 C0002SM F8130061 C0003SM F8130061C0004SM F8130061 C0005SM F8130061 C0006SM F8130061 C0007SM F8130061 C0008SM F8130061 C0009SM F8130061CO010SM F8130061CO011SM F8130061CO012SM F8130061CO013SM F8130061CO014SM F8130061CO015SM F8130061Co016SM F8130061CO017SM F8130061CO018SM F8130061CO019SM F8130061 C0020SM F8130061 C0021 SM F8130061 C0022SM F8130061 C0023SM F8130061 C0024SM F8130061C0025SM F8130061C0026SM F8130061 C0027SM F8130061 C0028SM F8130061 C0029SM F8130061 C0030SM F8130061 C0031 SM F8130061 C0032SM F8130061 C0033SM F8130061 C0034SM F8130061 C0035SM F8130061 C0036SM F8130061 C0037SM F8130061 C0038SM F8130061CO039SM F8130061CO040SM F8130061C0041SM F8130061CO042SM F8130061C0043SM F8130061 C0044SM Mean:

Median:

Standard Deviation:

Ranqe:

17.13 85.58 19.72 14.55 30.05 71.37 175.98 55.88 139.82 68.79 208.27 125.61 107.53 86.87 102.37 112.7 133.36 68.79 216.02 175.98 190.19 148.86 49.42 50.71 35.21 8.09 4.22 17.13 30.05 8.09 31.34 49.42 53.29 31.34

-2.24 4.22 1.64 30.05 0.34 5.51

-0.95 6.8 42.96 39.09 64.8 46.19 62.32

-2.24 to 216.02 Page 6 of 8, FSS Summary Report F8130061

Survey Unit Data Assessment:

The survey design required 44 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.

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):

44 Median (dpm/100 cm 2):

2122 Mean (dpm/100 cm 2):

2076 Direct Measurement Standard Deviation 869 (dpm/100 cm 2):

Total Standard Deviation (dpm/100 cm 2):

869 Based on samples and backgrounds.

Maximum (dpm/100 cm 2):

4373 Material Type:

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

44 S+ Value:

44 Critical Value:

27 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 I Page 7 of 8 FSS Summary Report F8130061

Survey Unit Investigations and Results:

Two investigations (scan grid 222 and penetration 029) were required for the scan measurements based on an investigation level set conservatively at the DCGLw. The results are reported in Attachment 3. The EMC unity rule was not exceeded as shown in Table 3-1.

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. Two potential areas of elevated activity were detected and evaluated as shown in Attachment 3 demonstrating 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. The required investigations were performed and evaluated as necessary.

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 F8130061 meets the release criteria of 10CFR20.1402.

Page 8 of 8 FSS Summary Report F8130061

Attachment I Maps March 3, 2008 Survey Unit F8130061

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

Model; Serial No.

(dpmll00 cm2 )

(dpm/100 cm 2 )

M2350; 180733 43-9813; 148638 N/A 6302,3 M2350; 180733 43-98B; 148638 N/A 9902,4 M2350; 180733 43-98B; 148638 N/A 14902,1 M250 1073 3-8B 1868N/A 142,5 M2350; 180733 43-98B; 148638 N/A

25201, M2350; 180733 43-94; 148620 N/A, 10301,3 M2350; 203486 43-68B; 190476 4331 1033' M2350; 203482 43-68B; 178511 2572 2

M2350; 203486 43-68B; 161400 M2350; 142507 43-68B; 160781 433' 1033' M2350; 142515 43-68B; 148453 M2350; 142515 43-116-1B; 256007 796' 3258' M2350; 203486 43-116-1B; 190173 4911,6 7391,6 M2350; 149789 43-116-1B; 256006 4722 19302 M2350; 203486 43-116-1B; 190173 2912,6 4372,6 Tennelec; 0401171 N/A 5.88 dpm a, 11.7 dpmf3 N/A 1 Concrete 2 Metal 3 2" penetration 4 3" penetration 5 4" penetration 6 Juncture Table 2-2. Investigation Criteria and DCGL Value Parameter (dpm/100 cm2)

Investigation Criteria - Direct 154227 Investigation Criteria - Scan 43000' DCGLw 43000 DCGLEMC 154227 Investigation level setat DCGLw within the survey instruction Page 2 of 2 Att. 2 Instrumentation F8130061 InVestigation March 3, 2008 Survey Unit F8130061

Table 3-1 Survey Unit Investigation Investigation Initial Value Investigation Elevated Area Investigation DCGLernc EledResult ar DCGLemc Result Unity GLdeInvestio Ia Ve (cpm)

Area (i

2)

Factor (dpm/lOOcm2)

Fraction 0222 58401 7066 7066 2.3 7.75 333256 51835 0.149 P029 19901 4981 4981 0.30 45.38 1950092 107627 0.054 DCGL =

SU Mean =

Survey Unit Remainder 43,000 2076 0.048 EMC Unity Sum 0.251.

1 Investigation level conservatively set at DCGLw Page 2 of 2 Att. 3 Investigation F8130061 Data Assessment March 3, 2008 Survey Unit F8130061

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