ML090980393

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Final Status Summary Survey Report, November 10, 2008 Reactor Building Drains Survey Unit F8990401
ML090980393
Person / Time
Site: Rancho Seco
Issue date: 11/10/2008
From: Ellen Brown
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
Shared Package
ML090830613 List: ... further results
References
DPG 09-097
Download: ML090980393 (20)
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Rancho Seco Final Status Survey Summary Report November 10, 2008 Reactor Building Drains Survey Unit F8990401 Prepared By:________ __ Date: ////o//oo8 FSS Engineer Reviewed By: Date: t/1(o I CS Lead FSS Engineer Approved By: __ Date:

  • 0-Dismantlement Superintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8990401, Reactor Building Drains Survey Unit

Description:

Operating History: This system provided an alternate pathway for delivering feed water to the steam generators. This system was reported to have been contaminated as a result of steam generator primary to secondary tube leaks. Operating records and the HSA document occurrences of radioactive contamination associated with this system piping.

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 spaced at 15cm intervals and 12 m2 were scanned for 100% coverage. 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 10 FSS Summary Report F8990401

Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area:. F899 Reactor Building Drains Survey Unit: 0401 Structure Surface Class: 1 LTP Table 5-4 SU Area (m2): 12 Evaluator: Erin L. Brown DCGL (dpm/100 cm 2): 100000 Gross Activity DCGL Area Factor: 1 Class 1 Design DCGLemc 100000 Class 1 (dpm/100 cm 2):

LBGR (dpm/1 00 cm 2): 50000 Default = 50% DCGL Design Sigma (dPm/100 cm 2): 100000 Type I Error: 0.05 Type II Error: 0.05 Predominant Nuclide: Cs-137 Sample Area (m2): N/A Embedded Pipe Scan Area (mi): 12 Scan Coverage (%): 100% Class 1 1.645 1.645 Sign P: 0.691462 Calculated Relative Shift: 0.5 Relative Shift Used: 0.5 Uses 3.0 if Relative Shift is

>3 N-Value: 74 Design N-Value + 20%: 89 NUREG-1575 Table 5-5 Design Min Samples N: 89 Class 1 Grid Spacin2 L: 0.3 Class 1 Page 3 of 10 FSS Summary Report F8990401

Survey Results:

A total of 203 direct measurements were made in F8990401. 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 measurements indicated areas of elevated activity.

Survey activity ranged from 1757 to 19144 dpm/100 cm 2 , based on the pipe detector efficiency.

Table 2. Direct Measurement Results Measurement ID Gross Activit (dpm/100 cm F8990401-MOOOIGI 19144 F8990401-MOO02GI 18081 F8990401-MOO03GI 13937 F8990401-MOO04GI 15624 F8990401-MOOO5GI 11099 F8990401-MOO06GI 9676 F8990401-MOO07GI 7753 F8990401-MOO08GI 6938 F8990401-MOO09GI 4896 F8990401-MOOlOGI 3710 F8990401-MOO11GI 5729 F8990401-MOO12GI 8753 F8990401-MOO13GI 5285 F8990401-MOO14Gi 4315 F8990401-MOO15GI 3865 F8990401-MOO16GI 3928 F8990401-MOO17GI 4047 F8990401-MOO18GI 4918 F8990401-MOO19GI 4121 F8990401-MOO20GI 3913 F8990401-MOO21GI 4762 F8990401-M0022GI 5206 F8990401-M0023GI 4458 F8990401-M0024GI 3841 F8990401-M0025GI 3822 F8990401-M0026GI 3447 F8990401-M0027GI 3337 F8990401-M0028GI 3260 F8990401-M0029GI 3785 F8990401-MOO30GI 3709 F8990401-MOO31GI 3360 F8990401-M0032GI 3024 F8990401-M0033GI 3312 F8990401-M0034GI 3371 F8990401-M0035GI 3488 F8990401 -M0036GI 3147 F8990401-M0037GI 3025 F8990401-M0038GI 3186 F8990401-M0039GI 3282 F8990401-MOO40GI 3255 Page 4 of 10 FSS Summary Report F8990401

F8990401-MOO41GI 3451 F8990401-M0042GI 3506 F8990401-M0043GI 3858 F8990401-M0044GI 4348 F8990401-M0045GI 4835 F8990401-M0046GI 4741 F8990401-M0047GI 4216 F8990401-M0048GI 3941 F8990401-M0049GI 3685 F8990401-MOO50GI 3825 F8990401-MO051GI 4395 F8990401-M0052GI 4353 F8990401-M0053GI 5091 F8990401-M0054GI 4966 F8990401-M0055GI 5756 F8990401-M0056GI 6814 F8990401-M0057GI 8685 F8990401-M0058GI 8395 F8990401-M0059GI 6928 F8990401-MOO60GI 5871 F8990401-M0061GI 6857 F8990401-M0062GI 6794 F8990401-M0063GI 7228 F8990401-M0064GI 7057 F8990401-M0065GI 7329 F8990401-M0066GI 6698 F8990401-M0067GI 6213 F8990401-M0068GI 5863 F8990401-M0069GI 4452 F8990401-MOO70GI 3802 F8990401-MOO71GI 3426 F8990401-M0072GI 4505 F8990401-M0073GI 5254 F8990401-M0074GI 6081 F8990401-M0075GI 6454 F8990401-MOO76GI 7253 F8990401-M0077GI 7555 F8990401-M0078GI 8107 F8990401-M0079GI 8157 F8990401-MOO80GI 7131 F8990401-M0081GI 5777 F8990401-M0082GI 6731 F8990401-M0083GI 9428 F8990401-M0084GI 10379 F8990401 -M0085GI 9122 F8990401-M0086GI 9231 F8990401-M0087GI 10492 F8990401-M0088GI 9031 F8990401-M0089GI 7449 F8990401-MOO90GI 6772 F8990401-MOO91GI 5854 F8990401-M0092GI 4853 F8990401-M0093GI 5682 F8990401-M0094GI 7363 F8990401-M0095GI 8469 F8990401-M0096GI 7609 Page 5 of 1 0 FSS Summary Report F8990401

F8990401-M0097GI 7331 F8990401-M0098GI 7900 F8990401-M0099GI 8100 F8990401-MO100GI 10649 F8990401-MO101GI 14694 F8990401-MO102GI 17950 F8990401-MO103GI 16001 F8990401-MO112GI 2633 F8990401-MO113GI 2804 F8990401-MO114GI 2817 F8990401-MO115GI 3123 F8990401-MO116GI 4260 F8990401-MO117GI 3860 F8990401-MO118GI 2970 F8990401-MO119GI 2680 F8990401-MO120GI 2389 F8990401-MO121GI 2336 F8990401-M0122GI 2256 F8990401-M0123GI 2208 F8990401-M0124GI 2212 F8990401-MO125GI 2191 F8990401-M0126GI 2121 F8990401-M0127GI 2116 F8990401-M0128GI 2124 F8990401-M0129GI 2078 F8990401-MO130GI 1983 F8990401-MO131GI 2141 F8990401-MO132GI 2177 F8990401-M0133GI 2150 F8990401-M0134GI 2184 F8990401-M0135GI 2257 F8990401-M0136GI 2294 F8990401-M0137GI 2359 F8990401-M0138GI 2439 F8990401-M0139GI 2516 F8990401-MO140GI 2714 F8990401-MO141GI 2867 F8990401-M0142GI 2320 F8990401-M0143GI 2234 F8990401-M0144GI 2141 F8990401-M0145GI 2093 F8990401-M0146GI 2128 F8990401-M0147GI 2162 F8990401-MO148GI 2200 F8990401-M0149GI 2225 F8990401-MO150GI 2267 F8990401-MO151GI 2129 F8990401-M0152GI 2227 F8990401-MO153GI 2172 F8990401-MO154GI 2150 F8990401-M0155GI 2251 F8990401-M0156GI 2313 F8990401-M0157GI 2353 F8990401-M0158GI 2345 F8990401-M0159GI 2245 F8990401-MO160GI 2194 Page 6 of 10 FSS Summary Report F8990401

F8990401-MO161GI 2238 F8990401-M0162GI 2237 F8990401-MO163GI 2168 F8990401-MO164GI 2264 F8990401-MO165GI 2228 F8990401-M0166GI 2207 F8990401-MO167GI 2174 F8990401-MO168GI 2068 F8990401-MO169GI 2066 F8990401-MO170GI 2178 F8990401-MO171GI 2178 F8990401-MO172GI 2176 F8990401-MO173GI 2176 F8990401-MO174GI 2198 F8990401-MO175GI 2170 F8990401-MO176GI 2259 F8990401-MO177GI 2260 F8990401-MO178GI 2609 F8990401-MO179GI 2410 F8990401-MO180GI 2251 F8990401-MO181GI 2337 F8990401-MO182GI 2281 F8990401-MO183GI 2291 F8990401-MO184GI 2410 F8990401-MO185GI 2084 F8990401-MO186GI 2338 F8990401-MO187GI 2360 F8990401-MO188GI 3382 F8990401-MO189GI 3073 F8990401-MO190GI 2527 F8990401-MO191GI 2355 F8990401-MO192GI 2510 F8990401-MO193GI 2612 F8990401-MO194GI 2494 F8990401-MO195GI 2413 F8990401-MO196GI 2341 F8990401-MO197GI 2195 F8990401-MO198GI 2107 F8990401-M0199GI 1999 F8990401-MO200GI 2081 F8990401-M0201GI 2067 F8990401-M0202GI 2070 F8990401-M0203GI 2036 F8990401-M0204GI 2096 F8990401-M0205GI 2053 F8990401-M0206GI 2057 F8990401-M0207GI 1994 F8990401-M0208GI 2022 F8990401-M0209GI 2054 F8990401-M0210GI 1788 F8990401-MO211GI 1757 Mean: 4427 Median: 3255 Standard Deviation: 3215 Range: 1757-19144 Page 7 of 10 FSS Summary Report F8990401

Survey Unit Data Assessment:

The survey design required 203 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 8 of 10 FSS Summary Report F8990401

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): 203 Median (dpm/100 cm 2): 3255 2

Mean (dpm/100 cm ): 4427 Direct Measurement Standard Deviation 3215 2

(dpm/100 cm ):

Total Standard Deviation (dpm/100 cm 2): 3215 Based on samples and backgrounds.

Maximum (dpm/100 cm 2): 19144 Material Type: N/A IBackground Subtract Not Applied Sign Test Final N Value: 203 S+ Value: 203 Critical Value: 113 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 9 of 10 FSS Summary Report F8990401

Survey Unit Investigations and Results:

No investigations were required 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 the LTP for pipe surveys. No direct measurements exceeded the DCGL of 100000 dpm/l100 cm 2. 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 F8990401 meets the release criteria of 10CFR20.1402.

Page 10 of 10 FSS Summary Report F8990401

Attachment 1 Maps November 10, 2008 Survey Unit F8990401

00 I'J 00 SCALE METERS PLAN VIEW EL. -25'-0" REACTOR BUILDING EL. -25' FLOOR DRAIN PIPING SMUD SACRAMENTO MUNICIPAL UTILITY DISTRICT F8990401-M1 FILE: F8990 40 SHEET 1 OF 1 RC RAYMOND

(D 0

1-1 Z

PIPING -

SUMMARY

SIZE LENTh ARA REACTOR BUILDING EIL. -25' SUMP B DIS.CH.ARGE 4"o 6'o 55 LF 5*5 SM 55 LF 8.5 SM

  • smuD SACRAMENTO MUNICIPAL F8990401 -M2 UTILfTY DISTRICT FILE: F899040 SHEET 1 OF 1 RC RAYMOND

Attachment 2 Instrumentation November 10, 2008 Survey Unit F8990401

Table 2-1. Survey Unit Instrumentation Instrument Detector MDC Statlic MDC Scan Model; Serial No. Model; Serial No. (dpm/100 cIm 2 ) (dpm/100 cm 2 )

M2350; 142512 44-157; 215958 1750 N/A The MDC noted for the detector model 44-157 is for the 4" diameter piping which is the most conservative for the survey performed.

Table 2-2. Investigation Criteria and DCGL Value Parameter (dpm/100 cm 2 )

Investigation Criteria - Direct 100000 Investigation Criteria - Scan N/A DCGLw 100000 DCGLEMC N/A Page 2 of 2 Att. 2 Instrumentation8 F8990401

Attachment 3 Investigation November 10, 2008 Survey Unit F8990401 (none required)

Attachment 4 Data Assessment November 10, 2008 Survey Unit F8990401

F8990401 Gross Activity Sample Results Quantile Plot 0O DCGL = 100000 dpm/1 00cm2 25,000 20,000 15,000 I

4-10,000 3

5,000 3255 0

0 20 40 60 80 100 Percentile 00

  • Direct Measurements (dpm/100cm2) -medlan - - - 75th Percentile - - - - 50th Percentile

I'Q 0

F8990401 Gross Activity Sample Results Scatter Plot 2

DCGL = 100000 dpm/100cm 4-1 25000 20000 E

15000 00 0 00 0 14072 0 0 O bI

  • 0 "

0 o&

E 10000 0 9 CL 5000 4427 a.

0 tfhlmtjltnt+lHuHftfrf lluH tflHffI irnuuHh H mfluftttffllt*h*mi iitmtifilH* nltmfftflm

-5000 -5218

$41%nnn sItjwfllf C')

Measurement Locations 00 0 Gross Activity - Average, - - "+3StDev" - - M3Dev"

F8990401 Gross Activity Frequency Plot DCGL = 100000 dpm/1 00cm2 100 95 90 85 80 75 Cr

0) 70 65 r+ LI.. 60 LL 55 C 50 0

OD 45 U)

V) 40 35 CD, 30 25 20 15 10 CD 00 I8

('4 oo It 00 I' Bins - Upper End Value (dpm/1 00cm2)

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