ML090980396
| ML090980396 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 08/25/2008 |
| From: | Ellen Brown Sacramento Municipal Utility District (SMUD) |
| To: | NRC/FSME |
| Shared Package | |
| ML090830613 | List:
|
| References | |
| DPG 09-097 | |
| Download: ML090980396 (40) | |
Text
Rancho Seco Final Status Survey Summary Report August 25, 2008 North Diesel Generator Room (Class 2 Area)
Survey Unit F8131211 Prepared By:_ O Date: 812 5,2* D 6 FSS Engineer Reviewed By: " Date: II tI-+
Lead FSS Engineer Approved By: Date: >- i'-o Dismantlement Superintendent, Radiological
FINAL STATUS SURVEY
SUMMARY
REPORT Survey Unit:
F8131211, North Diesel Generator Room (Class 2 Area)
Survey Unit
Description:
Operating History: The 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. One report documented contamination of the auxiliary building roof. The roof was later replaced.
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 cm 2 and a maximum value of 5,720,000 dpm/100 cm 2 .' Direct measurements on the -29' elevation showed a mean gross activity level of 544,756 dpm/100 cm 2 and a maximum value of 11,370,000 dpm/1 00 cm 2 . Direct measurements 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. Direct measurements on the grade elevation showed a mean gross activity level of 373,758 dpm/100 cm 2 and a maximum value of 5,800,000 dpm/100 cm 2. Direct measurements on the +20' elevation showed a mean gross activity level of 85,408 dpm/100 cm 2 and a maximum value of 1,900,000 dpm/100 cm 2 . 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 . Direct measurements on the building exterior, including the mezzanine roof, showed a mean gross activity level of 1,897 dpm/100 cm 2 and a maximum value of 2,990 dpm/100 cm 2. (The roof had been replaced prior to the classification survey.) Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the interior of the auxiliary building was determined to be a Class 1, 2 area and the exterior was a Class 2,3.
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 160 m2 were scanned for approximately 16% coverage. Samples of removable contamination were collected at each direct measurement location. The instrumentation used for the survey along with the MDC valuesare listed in Tables 2-1 and 2-2 in Attachment 2.
Page 2 of 8 FSS Summary Report F8131211
Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F813 North Diesel Generator Room (Class 2 Area)
Survey Unit: 1211 Structure Surface Class: 2 LTP Table 5-4 SU Area (m2): 995 Evaluator: Erin L. Brown DCGL (dpm/100 2 cm ): 43000 Gross Activity DCGL Area Factor: N/A Class 2 Design DCGLemc N/A Class 2 (dpm/I100 cm 2):
LBGR (dpm/100 cm 2): 21500 Default = 50% DCGL Design Sigma (dpm/100 cm2): 6935 Type I Error: 0.05 Type II Error: 0.05 Predominant Nuclide: Cs-137 Sample Area (m2): 71.1 Class 2 Scan Area (M2 ): 160 Scan Coverage (%): 16% Class 2 1.645 1.645 Sign P: 0.99865 Calculated Relative Shift: 3.1 Relative Shift Used: 3 Uses 3.0 if Relative Shift is
>3 N-Value: 11 Design N-Value + 20%: 14 NUREG-1575 Table 5-5 Design Min Samples N: 14 Class 2 Grid Spacing L: 8.4 Class 2 Page 3 of 8 FSS Summary Report F8131211
Survey Results:
A total of 14 direct measurements were made in F8131211. 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 1106 to 32968 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 F8131211-CO001BD 1950 F8131211-CO002BD 2137 F8131211-CO003BD 1592 F8131211-CO004BD 1463 F8131211-CO005BD 1499 F8131211-CO006BD 1437 F8131211-CO007BD 1826 F8131211 -C0008BD 1592 F8131211 -CO009BD 1873 F8131211 -Co01OBD 1338 F8131211 -CO011 BD 1266 F8131211-CO012BD 1691 F8131211-CO013BD 1800 F8131211-CO014BD 1504 Mean: 1641 Median: 1592 Standard Deviation: 249 Range: 1266 2137 Page 4 of 8 FSS Summary Report F8131211
Table 3. Removable Surface Activity Results Measurement ID Surface Beta Activity (dpm/100 cm 2)
F8131211 C0001 SM 0.34 F8131211C0002SM 1.64 F8131211C0003SM 17.13 F8131211 C0004SM 0.34 F8131211 C0005SM -3.53 F8131211 C0006SM -2.24 F8131211 C0007SM -2.24 F8131211C0008SM -0.95 F8131211 C0009SM -2.24 F8131211CO010SM -0.95 F8131211 C0011 SM -3.53 F8131211C0012SM 5.51 F8131211C0013SM -2.24 F8131211C0014SM -3.53 Mean: 025 Median: -1.59 Standard Deviation: 5.44 Range: -3.53 to 17.13 Page 5 of 8 FSS Summary Report F8131211
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 F8131211
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): 14 Median (dpm/100 cm 2): 1592 Mean (dpm/100 cm 2): 1641 Direct Measurement Standard Deviation 249 (dpm/100 CM2):
Total Standard Deviation (dpm/100 cm 2): 249 Based on samples and backgrounds.
Maximum (dpm/100 cm 2): 2137 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 2 Total Standard Deviation <= Sigma: Yes Pass the Sign Test? Yes Reject the Null Hypothesis? Yes Does the Survey Unit Pass All Criteria? Yes Page 7 of 8 FSS Summary Report F8131211
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, the ALARA criterion has been met.
Changes in Initial Survey Unit Assumptions:
The survey unit was designed as a Class 2 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 2 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 rejectidn 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 F8131211 meets the release criteria of 10CFR20.1402.
Page 8 of 8 FSS Summary Report F8131211
Attachment 1 Maps August 25, 2008 Survey Unit F8131211
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Attachment 2 Instrumentation August 25, 2008 Survey Unit F8131211
Table 2-1. Survey Unit Instrumentation Instrument Detector MDC Static MDC Scan Model; Serial No. Model; Serial No. (dpm/100 cm2 ) (dpmll00 cm2 )
M2350; 142514 43-111B; 148642 N/A 1320 M2350; 180733 43-98B; 148638 N/A 2520 M235.0; 180733 43-94B; 148620 N/A 1030 M2350; 175834 43-68B; 148634 433 1033 M2350; 180738 43-51B; 190666 N/A 4494 M2350; 180738 43-116-1B; 216073 N/A 3258 Tennelec; 0401171 N/A 5.9 dpm a, N/A 11.7 dpm 3 The MDC's noted are the most conservative for the survey performed.
Table 2-2. Investigation Criteria and DCGL Value Valuc Parameter (dpm/100 cm2)
Investigation Criteria - Direct 43000 Investigation Criteria - Scan 43000 DCGLw 43000 DCGLEMC N/A Page 2 of 2 Att. 2 Instrumentation F8131211
Attachment 3 Investigation August 25, 2008 Survey Unit F8131211 (none required)
Attachment 4 Data Assessment August 25, 2008 Survey Unit F8131211
CD F8131211 Gross Activity Sample Results Quantile Plot 0 DCGL = 43000 dpm/1 00cm2 2,500 2,000 1592 1,500 Z%
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F8131211 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpm/100cm 2 3000 E 2600 cq 2388 0
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CD F8131211 Gross Activity Frequency Plot DCGL = 43000 dpm/1 00cm 2 4-3 0~
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