ML090850553

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Final Status Survey Report for July 16, 2008, Turbine Building Structural Steel Framing, Survey Unit F8260202
ML090850553
Person / Time
Site: Rancho Seco
Issue date: 07/16/2008
From: Donna Anderson
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
Shared Package
ML090830613 List: ... further results
References
DPG 09-097
Download: ML090850553 (33)
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Rancho Seco Final Status Survey Summary Report July 16, 2008 Turbine Building Structural Steel Framing Survey Unit F8260202 Prepared By: ', *yi* Date:

FSS Engineer Reviewed By:7-&ý K9I)&k Date:

, Lead FSS Engineer Approved By: f Date: 'Z Dismantlement Superintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8260202, Turbine Building Structural Steel Framing Survey Unit

Description:

Operating History: The reinforced concrete and steel structure contained the turbine-generator and supporting systems. The building contained five 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 in the condenser pit elevation showed a mean gross activity level of 3,077 dpm/100 cm 2 and a maximum value of 24,900 dpm/1 00 cm 2 . Direct measurements on the grade elevation showed a mean gross activity level of 2,035 dpm/100 cm 2 and a maximum value of 6,980 dpm/10.0 cm 2. Direct measurements on the mezzanine elevation showed a mean gross activity level of 1,566 dpm/100 cm 2 and a maximum value of 2,626 dpm/100 cm 2 . Direct measurements on the +40' elevation showed a mean gross activity level of 2,843 dpm/100 cm 2 and a maximum value of 3,615 dpm/100 cm 2. Direct measurements on the building exterior showed a mean gross activity level of 1,984 dpm/l00 cm2 and a maximum value of 10,312 dpm/100 cm2 . Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the interior of the turbine building was determined to be Class 1, 2, & 3 areas and the exterior was a Class 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 randomly determined and 886.9 m2 were scanned for approximately 10%

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 F8260202

Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F826 Turbine Building Structural Steel Framing Survey Unit: 0202 Structure Surface Class: 3 LTP Table 5-4 SU Area (m): 9134.2 Evaluator: D. Anderson DCGL (dpm/100 cm 2): 43,000 Gross Activity DCGL Area Factor: N/A Class 3 Design DCGLemc N/A Class 3 (dpm/100 cm 2):

LBGR (dpm/100 cm 2): 39,052 Adjusted 2

Design Sigma (dpm/100 cm ): 1,316 Type I Error: 0.05 Type II Error: 0.05 Predominant Nuclide: Cs-137 Sample Area (M2): N/A Class 3 Scan Area 2 (M ): 886.9 Scan Coverage (%): 10% Class 3 1.645 ZI.*0 1.645 Sign P: 0.99865 Calculated Relative Shift: 3 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 3 N/A Class 3 Grid Spacing L:

- ________________________________ L Page 3 of 8 FSS Summary Report F8260202

Survey Results:

A total of 14 direct measurements were made in F8260202. 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 953 to 16,396 dpm/l 00 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/lO0 cm')

F8260202-MOO01 BD 434 F8260202-MOO02BD 465 F8260202-MOO03BD 658 F8260202-MOO04BD 468 F8260202-MOOO5BD 508 F8260202-MOO06BD 480 F8260202-MOO07BD 480 F8260202-M0008BD 566 F8260202-MOO09BD 452 F8260202-MOOOBD 560 F8260202-MO011BD 1,240 F8260202-MOO12BD 1,446 F8260202-MOO13BD 809 F8260202-MOO14BD 544 Mean: 651 Median: 526 Standard Deviation: 312 Range: 434-1,446 Page 4 of 8 FSS Summary Report F8260202

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

F8260202M0001 SM -4.82 F8260202M0002SM -2.24 F8260202M0003SM -2.24 F8260202M0004SM -3.53 F8260202M0005SM -4.82 F8260202M0006SM -4.82 F8260202M0007SM -2.24 F8260202M0008SM -4.82 F8260202M0009SM -4.82 F8260202M0010SM -3.53 F8260202M0011SM -4.82 F8260202M0012SM -3.53 F8260202M0013SM -2.24 F8260202M0014SM 0.34 Mean: -3.44 Median: -3.53 Standard Deviation: 1.56 Range: -4.82 to 0.34 Page 5 of 8 FSS Summary Report F8260202

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 F8260202

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): 526 Mean (dpm/100 2 cm ): 651 Direct Measurement Standard Deviation 312 (dpm/100 cm 2 ):

Total Standard Deviation (dpm/lOO cm 2): 312 Based on samples and backgrounds.

Maximum (dpm/100 cm 2): 1,446 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 Page 7 of 8 FSS Summary Report F8260202

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 43,000 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 F8260202 meets the release criteria of 10CFR20.1402.

Page 8 of 8 FSS Summary Report F8260202

Attachment I Maps July 16, 2008 Survey Unit F8260202

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/ F 10 .I LQII111 Location of Turbine Building inside the Industrial Area 00 bON I Map F8260202-1, Turbine Building Structural Steel Framing Location of Turbine Building at Rancho Seco site

2 3 4 5 6 789101123 8 9 10 11 12 13 (41) 0 00 U

23' 4" 17'0" 20' 4" 18'4" 18' 10.5" 18' 10.5" -Is 4 23' 4" 23' 4" 23' 4" 16' 11" 00 C)

N C) Map F8260202-2, Turbine Building (+) 39' 2" El.

0 2 4 6 8 Plan at Turbine Deck Distance in Meters Structural Steel Framing Area Estimate: 855.6 sq. meters

0 00 cjký Map F8260202-3, Turbine Building (+) 0' El. to (+) 40' El.

Structural Steel Framing - Crane Supports 00 Included in Structural Steel Framing Estimate for Turbine Deck to 01

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N Map F8260202-4, Turbine Building (+) 19' 10 3/4" El.

0 2 4 6 8 Plan at Mezzanine Floor Distance in Meters Structural Steel Framing Area Estimate: 3,366.0 sq. meters

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Map F8260202-5, Turbine Building (+) 20' El. to (+) 40' El.

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0 2 4 6 8 Plan at Mezzanine Level Distance in Meters Structural Steel Framing - Vertical I-Beams Area Estimate: 585.8 sq. meters

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Map F8260202-7, Turbine Building (+) 0' El. to (+) 20' El.

Grade Level Structural Steel Framing

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0 2 4 6 8 Plan at Grade Level Distancein Meter Structural Steel Framing - Vertical I-Beams Area Estimate: 4,326.8 sq. meters

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b 23' 4" 17'0" 20'4" 18'4" 18' 10.5" 18, 10.5" 1i" 4 23'4" 23' 4" 23' 4" 16' 11" 00 Map F8260202-9, Turbine Building (+) 39' 2" El.

0' Turbine Deck Structural Steel Framing N Beta Scan Measurements I'..

F8260202M001 5BS to F8260202M0030BS, 2 4 6 8 F8260202M0045BS to F8260202M0060BS and Distance in Meters F8260202M0073BS to F8260202M0148BS Total Scan Area: 139.6 sq. meters

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oo Mezzanine Level Structural Steel Framing - Vertical Beams o( rs em _____________________- B eta Scan Measurements

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  • CrsbasF8260202MO 169BS to F8260202MO1 71 BS, n Fg260202M0173BS to F8260202M0175BS, and Distane in Mete~rs Horizontal I-beam r~o')nor)o'f.A4Q'l")e* f,.- I:A')nnolAAt1QAI~0 Total Scan Area: 32.3 sq. meters

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-Il 23'4" 17'0" 20'4" 18'4" 18' 10.5" 18'10.5" 18'4" 23' 4" 23'4" 23' 4" 16'11" 00 Map F8260202-11, Turbine Building (+) 19'10 3/4" El. F8260202M0228BS to F8260202M0230BS, N Mezzanine Floor Structural Steel Framing F8260202M0232BS to F8260202M0234BS, C) Beta Scan Measurements F8260202M0236BS to F8260202M0238BS, and 0 2 4 6 8 F8260202M0031BS to F8260202M0044BS, F8260202M0239BS to F8260202M0421BS Distance in Meters F8260202M0185BS to F8260202M0222BS, Total Scan Area: 319.4 sq. meters F8260202M0224BS to F8260202M0226BS

(6 ft. above grade) 2 3 4 5 6 7 8 9 10 11 12 13 cJQ 231, 235 -w--, I II I!l II k

0 rU. 57213S - 577BS

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23'4" 17'0" 20' 4" 18'4" 18' 10.5" 18' 10.5" 18'4" 23' 4" 23'4". 23' 4" 16' 11" 00 Map F8260202-12, Turbine Building (+) 19' 10 3/4" El. F8260202M0168BS, F8260202M0172BS, 0C N Mezzanine Floor Structural Steel Framing F8260202M01 76BS to F8260202M01 81 BS, Beta Scan Measurements F8260202M0223BS, F8260202M0227BS, 0 2 4 6 8 F8260202M0001BS to F8260202M0014BS, F8260202M0231 BS, F8260202M0235BS and Distance in Meters F8260202M0061BS and F8260202M0072BS F8260202M0572BS to F8260202M0611BS F8260202M0149BS to F8260202M0164BS, Total Scan Area: 107.6 sq. meters

14WF 184 14WF 184 14WF184 1W 84 14WF 184

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