ML081580593
| ML081580593 | |
| Person / Time | |
|---|---|
| Site: | Rancho Seco |
| Issue date: | 05/12/2008 |
| From: | Ellen Brown Sacramento Municipal Utility District (SMUD) |
| To: | NRC/FSME |
| References | |
| F8990071 | |
| Download: ML081580593 (24) | |
Text
Rancho Seco Final Status Survey Summary Report March 25, 2008 Turbine Building Drains Survey Unit F8990071 Prepared By: ýLr Z. /*,jm,- Date: 0/2 b5/2.O FSS E:n er Reviewed By: Date:-.
Lead FSS Engineer Approved By: Date: 5 -/ o Dismantlement Superintendent, Radiological
FINAL STATUS SURVEY
SUMMARY
REPORT Survey Unit:
F8990071, Turbine Building Drains Survey Unit
Description:
Operating History: This system collected clean water leakage and condensate from the turbine and routed it to the drain tank. This system was contaminated by radioactive system leakage into steam, feed and cooling water systems. Operating records and the HSA document occurrences of radioactive contamination associated with this system piping.
Site Characterization: Direct measurements were made of the interior surfaces of the system piping which confirmed the presence of plant-derived radionuclides. Direct 2
measurements of the interior showed a mean gross activity level of 56,208 dpm/100 cm and a maximum value of 680,000 dpm/100cm2 . Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the system was determined to be a Class 1 system.
HSA Events: ODR-800111, 871122.
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 11.1 m 2 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 14 FSS Summary Report F8990071
Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area): F899 Turbine Building Drains Survey Unit: 0071 .Structure Surface Class: 1 LTP Table 5-4 SU Area (m2): 11.1 Evaluator: Erin L. Brown DCGL (dpm/100 cm 2): 100000 Gross Activity DCGL Area Factor: 1 Class 1 Design DCGLemc 100000 Class i (dpm/100 cm 2):
LBGR (dpm/100 cm 2): 50000 Default = 50% DCGL Design Sigma (dpm/100 cm 2): 23464 Type I Error: 0.05 Type II Error: 0.05 Predominant Nuclide: Cs-137 Sample Area (m2): N/A Class 1 Scan Area (m2): 11.1 Scan Coverage (%): 100% Class 1 ZI.* : 1.645 1.645 Sign P: 0.97725 Calculated Relative Shift: 2.2 Relative Shift Used: *2.2 Uses 3.0 if Relative Shift is
>3 N-Value: 12 Design N-Value + 20%: 15 NUREG-1575 Table 5-5 Design Min Samples N: 15 Class 1 Grid Spacing L: 0.8 Class 1 Page 3 of 14 FSS Summary Report F8990071
Survey Results:
A total of 409 direct measurements were made in F8990071. 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.
Scan activity ranged from 838 to 20923 dpm/100 cm 2 , based on the pipe detector efficiency.
Table 2. Direct Measurement Results Measurement ID Gross Activit (dpm/100 cm.
F8990071-MOO01 2539
- F8990071-M0002 2490
- F8990071-M0003 2905 F8990071-M0004 3174
,F8990071-M0005 3266 F8990071-M0006 3304 F8990071-M0007 3083 F8990071-M0008 3367 F8990071-M0009 3251 F8990071-MOO10 F 3565 F8990071-MOOl1 3261 F8990071-M0012 3179 F8990071-M0013 3309 F8990071-M0014 3256 F8990071-MOO15 3449 F8990071-M0016 3434 F8990071-M0017 2948 F8990071-M0018 3439 F8990071-MOO19 3256 F8990071-M0020 3377 F8990071-M0021 3362 F8990071-M0022 3314 F8990071-M0023 3420 F8990071-M0024. 3565 F8990071-M0025 3343 F8990071-M0026 3531 F8990071-M0027 3396 F8990071-M0028 3565 F8990071-M0029 3478 F8990071-M0030 3425 F8990071-M0031 3329 F8990071-M0032 3434 F8990071-M0033 3550 F8990071-M0034 3516 F8990071-M0035 3560 F8990071-M0036 3801 F8990071-M0037 3141 F8990071-M0038 2962 F8990071-M0060 2490 F8990071-M0061 1643 Page 4 of 14 FSS Summary Report F8990071
F8990071-MO062 2688 F8990071-MO063 2645 F8990071-MO064 2755 F8990071-MO065 2490.
F8990071-MO066 2423 F8990071-MO067 2355 F8990071-MO068 3006 F8990071-MO069 2808 F8990071-MO070 2852 F8990071-M0071 2823 F8990071-MO072 2577 F8990071-MO073 2900 F8990071-MO074 2832 F8990071-MO075 2726 F8990071-MO076 2697 F8990071-MO077 2755 F8990071-MO078 2799 F8990071-MO079 2712 F8990071-MO080 3030 F8990071-M0081 2934 F8990071-MO082 2813 F8990071-MO083 2856 F8990071-MO084 2905 F8990071-MO085 2789 F8990071-MO086 2842 F8990071-MO087 3083 F8990071-MO088 2842 F8990071-MO089 3001 F8990071-MO090 3126 F8990071-M0091 2977 F8990071-MO092 2669 F8990071-MO093 2669 F8990071-MO094 2789 F8990071-MO095 2847 F8990071-MO096 2779 F8990071-MO097 2640 F8990071-M0098 .2722 F8990071-M0099 2640 F8990071-MOIOO 3035 F8990071-MO101 2972 F8990071-M0102 2750 F8990071-M0103 2799 F8990071-M0104 2881 F8990071-M0105 2803 F8990071-M0106 2731 F8990071-M0107 3073 F8990071-M0108 2962 F8990071-M0109 3121 F8990071-MO110 3136 F8990071-MO111 2895 F8990071-M0112 2283 F8990071-MO113 1975 F8990071-M0114 2558 F8990071-M0115 2365 F8990071-MO125 2755 F8990071-M0126 2736 Page 5 of 14 FSS Summary Report F8990071
F8990071-M0127 2009 F8990071-M0128 2563 F8990071-M0129 2659 F8990071-MO130 2539 F8990071-M0131 2779 F8990071-M0132 2466 F8990071-M0133 2726 F8990071-MO134 2693 F8990071-MO135 2856 F8990071-M0136 2688 F8990071-M0137 2697 F8990071-M0138 2871 F8990071-M0139 2327 F8990071-M0140 2490 F8990071-M0141 2953 F8990071-M0142 2871 F8990071-M0143 3155 F8990071-MO144 3102 F8990071-M0145 3198 F8990071-M0146 2958 F8990071-M0147 2712 F8990071-M0148 2852 F8990071-M0149 2437 F8990071-M0150 2914 F8990071-M0151 2760 F8990071-M0152 2510
.F8990071-M0153 2664 F8990071-M0154 2770 F8990071-MO155 2818 F8990071-M0156 2688 F8990071-M0157 2712 F8990071-M0158 2876 F8990071-M0159 3353 F8990071-M0160 4037 F8990071-MO161 3357 F8990071-M0162 3646 F8990071-M0163 3285 F8990071-M0166 3738 F8990071-M0167 4436 F8990071-M0168 4302 F8990071-M0169 2004 F8990071-MO170 2919 F8990071-M0171 2996 F8990071-MO172 2539 F8990071-MO173 2895 F8990071-M0174 2712 F8990071-MO175 2645 F8990071-MO176 2818 F8990071-M0177 2813 F8990071-M0178 2962 F8990071-M0179 2779 F8990071-M0180 2799 F8990071-M0181 2726 F8990071-M0182 2519 F8990071-M0183 2784 F8990071-M0184 2967 Page 6 of 14 FSS Summary Report F8990071
F8990071-M0185 2630 F8990071-M0186 2924 F8990071-M0187 2861 F8990071-M0188 2794 F8990071-M0189 2789 F8990071-M0190 2775 F8990071-M0191 2736 F8990071-MO192 2770 F8990071-M0193 2755 F8990071-M0194 2808 F8990071-M0195 2645 F8990071-M0196 2722 F8990071-M0197 2842 F8990071-MO198 2572 F8990071-M0199 2832 F8990071-M0200 2934 F8990071-M0201 2688 F8990071-M0202 2750 F8990071-M0203 2853 F8990071-M0204 2522 F8990071-M0205 2895 F8990071-M0206 3085 F8990071-M0207 2869 F8990071-M0208 2738 F8990071-M0209 2832 F8990071-M0210 2922 F8990071-M0211 2796 F8990071-M0212 2806 F8990071-M0213 3095 F8990071-M0214 2817 F8990071-M0215 2832 F8990071-M0216 3090 F8990071-M0217 2974 F8990071-MO218 2874 F8990071-M0219 2974 F8990071-M0220 2743 F8990071-M0221 2906 F8990071-M0222 2859 F8990071-M0223 2669 F8990071-M0224 2990 F8990071-M0225 2827 F8990071-M0226 2806 F8990071-M0227 2775 F8990071-M0228 3074 F8990071-M0229 3001 F8990071-M0230 2817 F8990071-M0231 2995 F8990071-M0232 2874 F8990071-M0233 3053 F8990071-M0234 2880 F8990071-M0235 2633 F8990071-M0236 2727 F8990071-M0237 2985 F8990071-M0238 2995 F8990071-M0239 2885
, F8990071-M0240 2937 Page 7 of 14 FSS Summary Report F8990071
F8990071-M0241 2964 F8990071-M0242 2985 F8990071-M0267 3714 F8990071-M0268 2230 F8990071-M0269 2794 F8990071-M0270 2765 F8990071-M0271 2278 F8990071-M0272 2490 F8990071-M0273 2529 F8990071-M0274 2278 F8990071-M0275 2298 F8990071-M0276 2389 F8990071-M0277 2673 F8990071-M0278 2630 F8990071-M0279 2731 F8990071-M0280 2712 F8990071-M0281 2847 F8990071-M0282 2958 F8990071-M0283 2563 F8990071-M0284 2587 F8990071-M0285 2813 F8990071-M0286 4128 F8990071-M0287 4244 F8990071-M0288 3849 F8990071-M0289 3295 F8990071-M0290 3391 F8990071-M0291 3618 F8990071-M0292 4485 F8990071-M0293 4224 F8990071-M0308 4133 F8990071-M0309 2784 F8990071-M0310 4436 F8990071-M0311 3767 F8990071-M0312 3054 F8990071-M0313 2375 F8990071-M0314 2914 F8990071-M0315 2702 F8990071-M0316 2736 F8990071-M0317 2755 F8990071-M0318 2972 F8990071-M0319 2962 F8990071-M0320 2953 F8990071-M0321 2779 F8990071-M0322 2360 F8990071-M0323 2577 F8990071-M0324 2808 F8990071-M0325 2789 F8990071-M0326 2606 F8990071-M0327 2640 F8990071-M0328 2534 F8990071-M0329 2587 F8990071-M0330 2842 F8990071-M0331 2755 F8990071-M0332 2765 F8990071-M0333 2572 F8990071-M0334 2659 Page 8 of 14 FSS Summary Report F8990071
F8990071-M0335 2683 F8990071-M0336 2505 F8990071-M0337 2927 F8990071-M0338 2880 F8990071-M0339 2843 F8990071-M0340 3121 F8990071-M0341 3058 F8990071-M0342 2901 F8990071-M0343 2380 F8990071-M0344 2790 F8990071-M0345 2359 F8990071-M0346 2853 F8990071-M0347 2733 F8990071-M0348 2980 F8990071-M0349 2775 F8990071-M0350 3027 F8990071-M0351 2859 F8990071-M0352 2486 F8990071-M0353 2202 F8990071-M0354 1855 F8990071-M0355 1802 F8990071-M0356 1892 F8990071-M0357 1634 F8990071-M0358 1781 F8990071-M0359 1871 F8990071-M0360 2028 F8990071-M0361 2018 F8990071-M0362 1971 F8990071-M0363 1802 F8990071-M0364 2002 F8990071-M0365 1950 F8990071-M0366 2160 F8990071-M0367 2223 F8990071-MO368 2223 F8990071-M0369 2281 F8990071-M0370 2091 F8990071-M0371 2244 F8990071-M0372 2328 F8990071-M0373 2176 F8990071-M0374 2564 F8990071-M0375 2612 F8990071-M0376 2454 F8990071-M0377 2044 F8990071-M0378 2023 F8990071-M0379 1939 F8,990071-M0380 1871 F8990071-M0381 1876 F8990071-M0382 1703 F8990071-M0383 1739 F8990071-M0384 1682 F8990071-M0385 1597 F8990071-M0386 1503 F8990071-M0387 1561 F8990071-M0388 1477 F8990071-M0389 1529 F8990071-M0390 996 Page 9 of 14 FSS Summary Report .F8990071
F8990071-M0391 969 F8990071-M0392 838 F8990071-M0393 858 F8990071-M0394 1222 F8990071-M0395 1291 F8990071-M0396 2097 F8990071-M0397 2031 F8990071-M0398 2198 F8990071-M0399 2665 F8990071-M0400 3211 F8990071-M0401 2652 F8990071-M0402 3257 F8990071-M0403 8288 F8990071-M0404 20923 F8990071-M0419 3415 F8990071-M0420 3073 F8990071-M0421 2876 F8990071-M0422 2900 F8990071-M0423 2490 F8990071-M0424 2298 F8990071-M0425 2592 F8990071-M0426 2611 F8990071-M0427 2688 F8990071-M0428 2813 F8990071-M0429 2876 F8990071-M0430 3198 F8990071-M0431 2900 F8990071-M0432 2900 F8990071-M0433 2799 F8990071-M0444 3256 F8990071-M0445 2172 F8990071-M0446 2476 F8990071-M0447 3049 F8990071-M0448 4051 F8990071-M0449 3295 F8990071-M0450 3353 F8990071-M0451 2948 F8990071-M0452 3083 F8990071-M0453 2866 F8990071-M0454 2240 F8990071-M0455 2278 F8990071-M0456 2317 F8990071-M0457 2298 F8990071-M0458 2519 F8990071-M0459 2567 F8990071-M0460 2452 F8990071-M0461 2264 F8990071-M0462 2148 F8990071-M0463 2355 F8990071-M0464 2139 F8990071-M0465 2283 F8990071-M0466 1874 F8990071-M0467 2245 F8990071-M0468 2500 F8990071-M0469 2519 F8990071-M0470 3064 Page 10 of 14 FSS Summary Report F8990071
- 1*
F8990071-M0471 2775 F8990071-M0472 3165 F8990071-M0473 3049 F8990071-M0474 3314 F8990071-M0475 4552 F8990071-M0476 5014 F8990071-M0477 5130 F8990071-M0478 5761 F8990071-M0479 6089 F8990071-M0480 5313 F8990071-M0481 4456 F8990071-M0482 2943 F8990071-M0483 3203 F8990071-M0484 3030 F8990071-M0485 3160 F8990071-M0486 2876 F8990071-M0487 3333 F8990071-M0488 3039 F8990071-M0489 3391 F8990071-M0490 3165 F8990071-M0491 3160 F8990071-M0492 2775 F8990071-M0493 2818 F8990071-M0494 3165 F8990071-M0495 3314 F8990071-M0496 3353 F8990071-M0497 3507 F8990071-M0498 3998 F8990071-M0499 5197 F8990071-M0500 5578 F8990071-M0501 4778 F8990071-M0502 ,4586 P8990071-M0503 3001 Mean: 2901
,Median: 2813 Standard Deviation: 1139 Range: 838-20923 PagellIofl14 1oFSS Summary Report F8990071
Survey Unit Data Assessment:
The survey design required 409 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 12 of 14 FSS Summary Report F8990071
Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dpm/100 cm 2): N/A Ambient Background Used (dprm/l00 cm2): N/A Average Ambient BKG = 0 Actual Direct Measurements (N): 409 Median (dpm/100 cm 2): 2813 Mean (dpm/100 cm 2): 2901 Direct Measurement Standard Deviation 1139 (dpm/100 cm 2):
Total Standard Deviation (dpm/100 cm 2): 1139 Based on samples and backgrounds.
Maximum (dpm/100 cm 2): 20923 Material Type: N/A Background Subtract Not Applied Sign Test Final N Value: 409 S+ Value: 409 Critical Value: 221 Sufficient Samples Collected: Yes Maximum Value < DCGL: Yes Median Value < DCGL: Yes Mean Value < DCGL: Yes Maximum Value < DCGLemc: Yes Class I Total Standard Deviation <= Sigma: Yes Pass the Sign Test? Yes Reject the Null Hypothesis? Yes Does the Survey Unit Pass All Criteria? Yes Page 13 of 14 FSS Summary Report F8990071
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), 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 properlydesigned 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 100000 dpm/100 cm 2 or the grout limit of 21,000dpm/100cm 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 F8990071 meets the release criteria of 10CFR20.1402.
Page 14 of 14 FSS Summary Report F8990071
Attachment I Maps March 25, 2008 Survey Unit F8990071
O
(~QEL 2 NC)4 R (: RUN3
ý-0'+/-
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RUN 6 RUN I o R1 RUN EL. 4- EL O'-0*+/- UDN EL./ - 2 2 (2> ED 2 RUN 3 ~ RUN 3
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UN-E VIE 77
- UXILIARY BUILDING EL. W,-O" & BELOV PLAN VIEW DIESEL GENERATOR ROOMS 130 & 1352
-51 SCALE ~~~SACRAMENTOMUNUCPAL MIfLO DISRICT F907 M F907 M METERS RLE: 899a07 SNEET 1 OF IRC RAkYMOND
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00 IXILIARY BUILDING EL. 0'-0" & BEI FLOOR -& EQUIPMENT DRAINS DIESEL GEN ROOMS ISOMETRIC SACRAM~ENTO MIUNaCPAL UIJILFrY DMSRICT F8990071 -M2 RC RAYMOND
Attachment 2 Instrumentation March 25, 2008 Survey Unit F8990071
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; 142509 44-159; 238370 5720 N/A M2350; 142512 44-159; 201637 5720 N/A The MDC noted for the detector model 44-159 is for the 3" diameter piping which is the most conservative.
Table 2 -2. Investigation Criteria and DCGL Value Parameter Vmluecm 2 )
(dpm/100cm)
Investigation Criteria - Direct 100000 Investigation Criteria - Scan N/A DCGLW 100000 DCGLEMC N/A Page 2 of 2 Att. 2 Instrumentation F8990071
Attachment 3 Investigation March 25, 2008 Survey Unit F8990071 (none required)
Attachment 4 Data Assessment March 25, 2008 Survey Unit F8990071
CD F8990071 Gross Activity Sample Results Quantile Plot DCGL = 100000 dpmll 00cm 2 -
25,000 20,000 15,000 3.
U) 00 10,000 5,000 2813 0
0 20 40 60 80 100 Percentile
\10
- Direct Measurements (dpm/100cm2) - median - - - 75th Percentile --- - 50th Percentile
-Il C-)
('3 CD 0o, F8990071 Gross Activity Sample Results Scatter Plot A+ DCGL = 100000 dpm/100cm' 25000
-20000 - -
N E
o 16000 AE K CL 10000 CD)
Cl)D 5000 -
CD WOW 2901
-6000
- N M0
.0 .. O. t)o N P 0<A.. .. ,00)NN 0 000 0 0 0 0 00 0 00 0 00 Measurement Locations 00 0F-O..Go Activity - Average - - "+3St-ev" ..-. "-3StDev-0 0
F8990071 Gross Activity Frequency Plot DCGL = 100000 dpm/1 00crrm 260 240 220 CD 6)
C 200 180 U-160 140 I. 120 100 CD 80 60 40 20 0
cN LO 00
ý10 C) Bins - Upper End Value (dpm/1 00cm2)