ML090930662

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Final Status Survey Summary Report for February 19, 2009, Containment Floor, (-) 27' El., Survey Unit F8110114
ML090930662
Person / Time
Site: Rancho Seco
Issue date: 02/25/2009
From:
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
Shared Package
ML090830613 List: ... further results
References
DPG 09-097
Download: ML090930662 (45)
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Rancho Seco Final Status Survey Summary Report February 19, 2009 Containment Floor, (-) 27' El.

Survey Unit F8110114 Prepared By: Date: -Y FSS Engineer Reviewed By:" 'A Q"ate: 3- -

Lead FSS Engineer Approved By: Date: 1,3-07 Dismantlement ubperintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT, Survey Unit:

F8110114, Containment Floor, (-) 27' El.

Survey Unit

Description:

Operating History: The reinforced concrete structure contained the reactor and supporting systems. The building contained four 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. No events documenting exterior contamination were found.

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 -27' elevation showed a mean gross activity level of 1,535,383 dpm/100 cm 2 and a maximum value of 8,134,000 dpmr/100 cml. Direct measurements on the grade elevation showed a mean gross activity level of 201,670 dpm/100 cm 2 and a maximum value of 370,000 dpm/100 cm 2. Direct measurements on the +40' elevation showed a mean gross activity level of 51,521 dpm/100 cm 2 and a maximum value of 99,150 dpm/100 cm2 . Direct measurements on the +60' elevation showed a mean gross activity level of 20,110 dpm/100 cm 2 and a maximum value of 46,660 dpm/100 cm 2 . Direct measurements on the exterior roof showed a mean gross activity level of 1,364 dpm/ 100 cm 2 and a maximum value of 1,571 dpm/100 cm2. Based on the classification procedure (DSIP-0020) and levels of gross activity reported, the interior of the reactor building was determined to be a Class 1 area 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 determined using a fixed grid pattern and 1,125 m2 were scanned for 100% coverage. Samples of removable contamination were collected. 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 18 FSS Summary Report

Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F811 Containment Floor, (-) 27' El.

Survey Unit: 0114 Structure Surface Class: 1 LTP Table 5-4 SU Area (m): 1,125 Evaluator:. G. Frank DCGL (dpm/100 cm 2): 43,000 Gross Activity DCGL Area Factor: 14.9 Class 1 Design DCGLemc 640,700 Class I (dpm/100 cm 2):

LBGR (dpm/100 cm 2): 21,500 Default = 50% DCGL 2 31,920 Design Sigma (dp'm/100 cm ):

Type I Error: 0.05 Type II Error: 0.05 Predominant Nuclide: Cs-137 Sample Area (mS): 8.34 Class 1 Scan Area (m2): 1,125 Scan Coverage (%): 100% Class I 1.645 Zl-0 : 1.645 Sign P: 0.725747 Calculated Relative Shift: 0.6 Relative Shift Used: 0.6 Uses 3.0 if Relative Shift is

>3 N-Value: 54 Design N-Value + 20%: 65 NUREG-1575 Table 5-5 Design Min Samples N: 157 Class I Grid Spacing L: N/A Class I Page 3 of 18 FSS Summary Report

Survey Results:

A total of 183 direct measurements were made in F8110114. 157 of the measurements were analyzed for surface activity with the results shown in Table 2-1. 50 of the measurements (24 of the 157 analyzed for surface activity, plus an additional 26 measurements) were taken in the 24-foot diameter circular area directly below the reactor vessel location and analyzed for volumetric activity with the results shown in Table 2-3.

Statistical data including the mean, median, standard deviation and range for the surface activity evaluations and volumetric activity evaluations are shown in Tables 2-2 and 2-4, respectively. The 157 direct measurements analyzed for surface activity were less than Unity. The 50 volumetric measurements acquired from the activated concrete region of the floor were below the Eu-15 2 surrogate DCGL for activated concrete. None of the ISOCS gamma measurements indicated areas of elevated activity. None of the beta scans indicated areas of elevated activity with beta scan activity ranging from 3,209 to 64,644 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.

Page 4 of 18 FSS Summary Report

Table 2-1. Direct Measurement Results (all activity values in dpm/100 cm 2)

Sample Cs-I 37 Co-60 Eu-152 Unity ID Total F8110114 MDA Activity Error Unity MDA Activity Error Unity MDA Activity Error Unity Value Value Value C0001GS 995 995 0.018 520 0.034 2,730 0.086 0.138 C0002GS 500 997 434 0.018 544 0.036 2,590 0.081 0.135 C0003GS 592 1,068 480 0.019 647 0.043 2,560 0.081 0.142 C0004GS 509 1,118 456 0.020 734 0.048 2,420 0.076 0.145 C0005GS 581 2,090 618 0.038 647 0.043 2,710 0.085 0.165 C0006GS 551 2,282 636 0.041 683 0.045 2,420 0.076 0.162 C0007GS 529 2,994 726 0.054 628 0.041 2,440 0.077 0.172 C0008GS 526 3,549 798 0.064 683 0.045 2,010 0.063 0.172 C0009GS 509 3,853 835 0.069 683 0.045 2,620 0.082 0.197 C0010GS 538 2,128 611 0.038 544 0.036 2,830 0.089 0.163 C0011GS 526 2,360 639 0.042 566 0.037 2,360 0.074 0.154 C0012GS 485 1,776 546 0.032 659 0.043 2,130 0.067 0.142 C0013GS 501 1,333 486 0.024 675 0.044 2,170 0.068 0.137 C0014GS 505 5,568 1,054 0.100 588 0.039 2,360 0.074 0.213 C0015GS 952 0.017 647 0.043 2,690 0.085 0.144 C0016GS 819 0.015 666 0.044 2,680 0.084 0.143 C0017GS 1,040 0.019 666 0.044 2,500 0.079 0.141 C0018GS 879 0.016 628 0.041 2,440 0.077 0.134 C0019GS 987 0.018 718 0.047 2,570 0.081 0.146 C0020GS 943 0.017 375 0.025 2,310 0.073 0.114 C0021GS 888 0.016 495 0.033 2,590 0.081 0.130 C0022GS 961 0.017 608 0.040 2,300 0.072 0.130 C0023GS 461 926 409 0.017 544 0.036 2,590 0.081 0.134 C0024GS 952 0.017 495 0.033 2,690 0.085 0.134 C0025GS 479 971 423 0.017 469 1 1 0.031 2,340 0.074 0.122 Page 5 of 18 FSS Summary Report F8110114

Sample Cs-I 37 Co-60 Eu-152 Unity ID Total F8110114 MDA Activity Error Unity MDA Activity Error Unity MDA Activity Error Unity Value Value Value C0026GS 970 970 0.017 628 0.041 2,400 0.075 0.134 C0027GS 925 925 0.017 683 0.045 2,680 0.084 0.146 C0028GS 1,000 1,000 0.018 469 0.031 2,320 0.073 0.122 C0029GS 1,110 1,110 0.020 675 0.044 2,310 0.073 0.137 C0030GS 888 888 0.016 566 0.037 2,510 0.079 0.132 C0031GS 1,110 1,110 0.020 683 0.045 2,590 0.081 0.146 C0032GS 644 1,656 581 0.030 683 0.045 2,500 0.079 0.153 C0033GS 503 1,378 493 0.025 666 0.044 2,280 0.072 0.140 C0034GS 505 774 401 0.014 683 0.045 2,690 0.085 0.143 C0035GS 1,040 1,040 0.019 628 0.041 2,640 0.083 0.143 C0036GS 995 995 0.018 628 0.041 2,590 0.081 0.141 C0037GS 459 931 409 0.017 683 0.045 2,530 0.080 0.141 C0038GS 1,040 1,040 0.019 469 0.031 2,570 0.081 0.130 C0039GS 493 1,134 453 0.020 520 0.034 2,680 0.084 0.139 C0040GS 506 1,151 460 0.021 647 0.043 2,480 0.078 0.141 C0041GS 491 828 404 0.015 647 0.043 2,480 0.078 0.135 C0042GS 1,070 1,070 0.019 647 0.043 2,170 0.068 0.130 C0043GS 472 1,015 427 0.018 588 0.039 2,150 0.068 0.125 C0044GS 453 1,403 482 0.025 588 0.039 2,170 0.068 0.132 C0045GS 485 816 400 0.015 647 0.043 2,740 0.086 0.143 C0046GS 1,000 1,000 0.018 666 0.044 2,260 0.071 0.133 C0047GS 798 798 0.014 608 0.040 2,800 0.088 0.142 C0048GS 534 1,742 556 0.031 910 0.060 2,800 0.088 0.179 C0049GS 491 1,587 520 0.029 666 0.044 2,550 0.080 0.153 C0050GS 449 958 410 0.017 647 0.043 2,560 0.081 0.140 C0051GS 978 978 0.018 544 0.036 2,440 0.077 0.130 C0052GS 978 978 0.018 628 0.041 2,530 0.080 0.138 C0053GS 467 716 376 0.013 628 0.041 1,920 0.060 0.115 C0054GS 961 961 0.017 495 0.033 2,530 0.080 0.129 C0055GS 549 724 411 0.013 666 0.044 2,710 0.085 0.142 C0056GS 429 985 408 0.018 608 0.040 2,220 0.070 0.128 J L .1.__________ & __________

Page 6 of 18 FSS Summary Report F8110114

Sample Cs-1 37 Co-60 Eu-152 Unity ID Total F8110114 MDA Activity Error Unity MDA Activity I Error Unity MDA Activity Error Unity Value Value Value I

C0057GS 447 562 341 0.010 608 0.040 2,010 0.063 0.113 C0058GS 934 934 0.017 495 0.033 2,660 0.084 0.133 C0059GS 1,100 1,100 0.020 628 0.041 2,440 0.077 0.138 C0060GS 1,120 1,120 0.020 705 0.046 2,640 0.083 0.150 C0061 GS 1,210 1,210 0.022 608 0.040 2,680 0.084 0.146 C0062GS 425 491 319 0.009 588 0.039 2,440 0.077 0.124 C0063GS 443 975 411 0.018 626 0.041 2,680 0.084 0.143 C0064GS 413 599 335 0.011 705 0.046 2,510 0.079 0.136 C0065GS 555 1,106 471 0.020 701 0.046 2,660 0.084 0.150 C0066GS 1,210 1,210 0.022 734 0.048 2,760 0.087 0.157 C0067GS 462 528 341 0.009 608 0.040 2,440 0.077 0.126 C0068GS 1,070 1,070 0.019 544 0.036 1,990 0.063 0.118 C0069GS 496 496 0.009 608 0.040 2,200 0.069 0.118 C0070GS 961 961 0.017 588 0.039 2,500 0.079 0.135 C0071 GS 907 907 0.016 720 0.047 2,340 0.074 0.137 C0072GS 987 987 0.018 647 0.043 2,480 0.078 0.138 C0073GS 558 889 440 0.016 643 0.042 2,660 0.084 0.142 C0074GS 925 925 0.017 647 0.043 2,310 0.073 0.132 C0075GS 420 420 0.008 666 0.044 2,680 0.084 0.136 C0076GS 888 888 0.016 683 0.045 2,320 0.073 0.134 C0077GS 787 787 0.014 469 0.031 2,280 0.072 0.117 C0078GS 879 879 0.016 590 0.039 2,200 0.069 0.124 C0079GS 509 1,156 462 0.021 628 0.041 2,570 0.081 0.143 C0080GS 520 691 393 0.012 628 0.041 2,620 0.082 0.136 C0081 GS 484 551 355 0.010 628 0.041 2,460 0.077 0.129 C0082GS 995 995 0.018 675 0.044 2,380 0.075 0.137 C0083GS 1,150 1,150 0.021 683 0.045 2,260 0.071 0.137 C0084GS 509 780 403 0.014 588 0.039 2,400 0.075 0.128 C0085GS 552 552 0.010 675 0.044 2,500 0.079 0.133 C0086GS 1,040 1,040 0.019 701 0.046 2,550 0.080 0.145 C0087GS 527 742 404. 0.013 690 0.045 2,510 0.079 0.138 a s L S. n - ___________

Page 7 of 18 FSS Summary Report F8110114

Sample Cs-137 Co-60 Eu-152 Unity ID Total F8110114 MDA Activity Error Unity MDA Activity Error Unity MDA Activity Error Unity Value Value Value C0088GS 987 987 0.018 718 0.047 3,000 0.094 0.159 C0089GS 494 1,202 464 0.022 701 0.046 2,760 0.087 0.155 C0090GS 541 1,396 508 0.025 734 0.048 2,310 0.073 0.146 C0091 GS 489 967 426 0.017 647 0.043 2,680 0.084 0.144 C0092GS 916 916 0.016 628 0.041 2,040 0.064 0.122 C0093GS 787 787 0.014 566 0.037 2,130 0.067 0.118 C0094GS 1,100 1,100 0.020 608 0.040 2,460 0.077 0.137 C0095GS 577 1,883 589 0.034 701 0.046 2,840 0.089 0.169 C0096GS 1,140 1,140 0.021 766 0.050 2,960 0.093 0.164 C0097GS 1,090 1,090 0.020 718 0.047 2,960 0.093 0.160 C0098GS 1,010 1,010 0.018 683 0.045 2,680 0.084 0.147 C0099GS 888 888 0.016 690 0.045 2,400 0.075 0.137 COIOOGS 1,120 1,120 0.020 852 0.056 2,710 0.085 0.161 C0101GS 961 961 0.017 796 0.052 3,050 0.096 0.166 C0102GS 943 943 0.017 628 0.041 3,020 0.095 0.153 C0103GS 606 1,322 521 0.024 356 702 255 0.046 2,970 0.093 0.163 C0104GS 446 864 393 0.016 588 0.039 2,510 0.079 0.133 C0108GS 586 2,270 644 0.041 765 0.050 2,330 0.073 0.164 C01 09GS 505 .1,984 581 0.036 717 0.047 2,610 0.082 0.165 C0110GS 519 1,452 509 0.026 852 0.056 2,290 0.072 0.154 C0111GS 1,000 1,000 0.018 717 0.047 2,310 0.073. 0.138 C0112GS 1,240 1,240 0.022 826 0.054 2,170 0.068 0.145 C0113GS 967 967 0.017 749 0.049 2,560 0.081 0.147 C0114GS 428 428 0.008 765 0.050 2,550 0.080 0.138 CO 15GS 538 2,955 722 0.053 920 0.061 2,570 0.081 0.194 C0116GS 418 963 400 0.017 665 0.044 2,660 0.084 0.145 CO117GS 551 1,204 484 0.022 384 1,554 354 0.102 2,570 0.081 0.205 C0118GS 614 1,371 435 0.025 1150 0.076 2,310 0.073 0.173 C0119GS 569 871 358 0.016 396 1,494 432 0.098 3,190 0.100 0.214 C0120GS 743 985 890 0.018 448 981 275 0.065 3,190 0.100 0.183 C0121GS 1,140 1,140 0.021 1010 0.066 1,660 0.052 0.139

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Page 8 of 18 FSS Summary Report F8110114

Sample Cs-137 Co-60 Eu-152 Unity ID Total F8110114 MDA Activity Error Unity MDA Activity Error Unity MDA Activity Error Unity Value Value Value C0122GS 524 2,163 611 0.039 465 2,967 490 0.195 2,840 0.089 0.323 C0123GS 535 679 398 0.012 736 0.048 2,310 0.073 0.133 C0124GS 465 1,103 438 0.020 882 0.058 2,600 0.082 0.160 C0125GS 940 940 0.017 798 0.053 2,280 0.072 0.141 C0126GS 428 472 317 0.008 610 0.040 2,300 0.072 0.121 C0127GS 490 697 382 0.013 589 0.039 2,670 0.084 0.135 C0128GS 949 949 0.017 667 0.044 2,570 0.081 0.142 C0129GS 827 827 0.015 702 0.046 2,310 0.073 0.134 C0130GS 465 1,050 430 0.019 667 0.044 2,570 0.081 0.144 C0131GS 603 2,326 656 0.042 667 0.044 2,460 0.077 0.163 C0132GS 500 1,144 457 0.021 610 0.040 2,600 0.082 0.142 C0133GS 1,140 1,140 0.021 425 1,973 398 0.130 2,570 0.081 0.231 C 134GS 619 3,033 753 0.055 377 1,080 305 0.071 2,900 0.091 0.217 C0135GS 447 1,947 561 0.035 610 0.040 2,550 0.080 0.155 C 0136GS 1,020 1,020 0.018 498 2,087 509 0.137 2,500 3,840 1,670 0.121 0.276 C0137GS 1,030 1,030 0.019 777 0.051 2,310 0.073 0.142 C0138GS 816 816 0.015 589 0.039 2,340 0.074 0.127 C0139GS 837 837 0.015 649 0.043 2,440 0.077 0.134 C0140GS 904 904 0.016 630 0.041 2,280 0.072 0.129 C0141GS 949 949 0.017 473 1,509 440 0.099 2,650 0.083 0.200 C0142GS 592 592 0.011 470 1,054 276 0.069 2,490 0.078 0.158 C0143GS 895 895 0.016 610 0.040 2,300 0.072 0.129 C0144GS 696 734 353 0.013 545 0.036 1,850 0.058 0.107 C0145GS 795 795 0.014 545 0.036 2,180 0.069 0.119 C0146GS 866 866 0.016 649 0.043 2,200 0.069 0.127 C0147GS 740 740 0.013 545 0.036 2,160 0.068 0.117 C0148GS 886 886 0.016 685 0.045 2,400 0.075 0.136 C0149GS 1,040 1,040 0.019 448 3,270 536 0.215 2,080 7,620 1,810 0.240 0.473 C0150GS 984 984 0.018 558 2,633 544 0.173 1,650 5,312 1,040 0.167 0.358 C0151GS 876 876 0.016 471 2,337 547 0.154 1,620 3,875 1,010 0.122 0.291 C0152GS 793 2,385 596 0.043 459 1,719 464 0.113 3,740 0.118 0.274 L .1. __________ -

Page 9 of 18 FSS Summary Report F8110114

Sample Cs-1 37 Co-60 Eu-1 52 Unity ID Total F8110114 MDA Activity Error Unity MDA Activity Error Unity MDA Activity Error Unity Value Value Value C0153GS 465 642 820 0.012 546 1,482 439 0.097 2,280 0.072 0.181 COI54GS 847 847 0.015 467 1,522 432 0.100 3,240 0.102 0.217 C0155GS 857 857 0.015 468 1,502 420 0.099 2,330 2,980 1,965 0.094 0.208 C0156GS 827 827 0.015 557 1,860 476 0.122 3,650 0.115 0.252 C0157GS 1,040 2,667 892 0.048 525 4,652 1,099 0.306 1,990 9,028 1,447 0.284 0.638 C0158GS 859 1,993 562 0.036 580 5,361 1,169 0.353 2,260 10,260 1,470 0.323 0.711 C0159GS 862 2,610 1,602 0.047 686 4,274 576 0.281 2,000 4,900 1,036 0.154 0.482 C0160GS 847 847 0.015 627 1 1 0.041 2,440 1 1 0.077 0.133 Page 10 of 18 FSS Summary Report F8110114

Table 2-2. Direct Measurements Results Summary Cs-137 Co-60 Eu-152 Cs-137 Co-60 Eu-152 Unity Activity Activity Activity Unity Unity Unity Total (dpm/100 (dpm/100 (dpM/100 cm 2) cm 2) cm 2)

DCGLw 55,600 15,200 31,800 ~ ~ j Mean 1,180 859 2,686 0.021 0.057 0.084 0.162 Median 985 666 2,530 0.018 0.044 0.080 0.142 Standard 678 699 993 0.012 0.046 0.031 0.078 Deviation Cs-137 Activity Range 420 to 5,568 dpm/100 cm 2 2

Co-60 Activity Range 375 to 5,361 dpm/100 cm 2

Eu-152 Activity Range 1,660 to 10,260 dpm/100 cm Cs-137 Unity Range 0.008 to 0.100 Co-60 Unity Range 0.025 to 0.353 Eu-152 Unity Range 0.052 to 0.323 Total Unity Range 0.107 to 0.711 Sample Count 157 Page I11 of 18 FSS Summary Report

Table 2-3. Direct Measurement Results (all activity values in pCi/g)

Sample Eu-152 Surrogate ID F8110114 MDA Activity Error Activity DCGL C0136GS 9.60E-01 1.35E+00 4.84E-01 1.75E-01 C0137GS 8.87E-01 1.15E-01 C0138GS 8.98E-01 1.17E-01 C0139GS 9.35E-01 1.21E-01 C0140GS 8.74E-01 1.14E-01 C0141GS 1.02E+00 1.33E-01 C0142GS 9.56E-01 1.24E-01 C0143GS 8.82E-01 1.15E-01 C0144GS 7.10E-01 9.22E-02 C0145GS 8.35E-01 1.08E-01 C0146GS 8.43E-01 1.10E-01 C0147GS 8.26E-01 1.07E-01 C0148GS 9.20E-01 1.20E-01 C0149GS 7.97E-01 2.52E+00 5.26E-01 3.27E-01 C0150GS 6.31E-01 2.21E+00 4.73E-01 2.87E-01 C0151GS 6.22E-01 1.59E+00 4.20E-01 2.07E-01 C0152GS 1.44E+00 1.87E-01 COI53GS 8.73E-01 9.52E-01 4.28E-01 1.24E-01 CO154GS 1.24E-01 1.61 E-02 C0155GS 8.92E-01 1.03E+00 5.07E-01 1.34E-01 C0156GS 1.40E+00 1.82E-01 C0157GS 7.63E-01 3.78E+00 4.65E-01 4.91E-01 C0158GS 8.67E-01 3.96E+00 6.OOE-01 5.14E-01 COI59GS 7.68E-01 1.83E+00 4.89E-01 2.38E-01 C0163GS 6.12E-01 4.68E+00 6.67E-01 6.08E-01 C0164GS 1.10E+00 3.05E+00 6.46E-01 3.96E-01 C0165GS 7.70E-01 4.01 E+00 6.16E-01 5.21E-01 Page 12 of 18 FSS Summary Report F8110114

Sample Eu-152 Surrogate ID F8110114 MDA Activity Error Activity DCGL C0166GS 7.69E-01 4.81 E+00 6.39E-01 6.25E-01 C0167GS 1.15E+00 3.25E+00 6.31 E-01 4.22 E-01 C0168GS 6.99E-01 3.80E+00 6.11E-01 4.94E-01 C0169GS 8.16E-01 3.17E+00 5.20E-01 4.12E-01 C0170GS 8.68E-01 2.08E+00 4.75E-01 2.70E-01 C0171GS 7.90E-01 3.51 E+00 5.97E-01 4.56E-01 C0172GS 1.12E+00 3.29E+00 5.91E-01 4.27E-01 C0173GS 7.33E-01 4.12E+00 6.18E-01 5.35E-01 C0174GS 8.46E-01 4.33E+00 6.28E-01 5.62E-01 C0175GS 7.53E-01 2.19E+00 5.13E-01 2.84E-01 C0176GS 1.40E+00 1.82E-01 C0177GS 8.41 E-01 4.39E+00 6.05E-01 5.70E-01 C0178GS 9.11 E-01 1.07E+00 5.39E-01 1.39E-01 C0179GS 8.90E-01 3.55E+00 5.47E-01 4.61 E-01 C0180GS 9.28E-01 2.39E+00 5.02E-01 3.10E-01 C0181GS 9.75E-01 1.27E-02 C0182GS 9.32E-01 1.21 E-02 C0183GS 6.98E-01 2.31 E+00 4.46E-01 3.OOE-01 C0184GS 9.49E-01 1.97E+00 6.01 E-01 2.56E-01 C0185GS 7.11E-01 2.17E+00 4.52E-01 2.82E-01 C0186GS 1.40E-01 1.82E-02 C0187GS 1.24E-01 1.61 E-02 C0188GS 1.38E-01 1.79E-02 Page 13 of 18 FSS Summary Report F8110114

Table 2-4. Direct Measurements Results Summary Eu-1 5 2 Surrogate Activity (pCi/g)

DCGLw 7.70 Mean 2.01 Median 1.52 Standard 1.37 Deviation Eu-1 5 2 Surrogatem Activity Range 1.24E-0 1 to 4.81 E+00 Sample Count 50 Page 14 of 18 FSS Summary Report

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

F8110114C0001SM 38.45 F8110114C0002SM 2.29 F8110114C0003SM 3.58 F8110114C0004SM -0.29 F8110114CO005SM 38.45 F8110114C0006SM 20.37 F8110114C0007SM -0.29 F8110114C0008SM 1 F8110114C0009SM 3.58 F8110114C0010SM 10.04 F8110114CO01ISM 7.46 F8110114CO012SM -1.58 F8110114C0013SM 3.58 F8110114C0014SM 4.87 F8110114CO015SM 1 F8110114CO016SM 4.87 F8110114CO017SM 1 F8110114CO018SM -0.29 F8110114C0019SM 6.16 F8110114C0020SM 10.04 F8110114C0021SM 4.87 F8110114C0022SM 1 F8110114C0023SM 1 F8110114C0024SM 7.46 F8110114C0025SM 4.87 F8110114C0026SM -1.58 F8110114C0027SM 3.58 F8110114C0028SM 7.46 F8110114C0029SM 2.29 F8110114CO030SM 6.16 Mean: 6.38 Median: 3.58 Standard Deviation: 9.76 Range: -1.58 to 38.45 Page 15 of 18 FSS Summary Report

Survey Unit Data Assessment:

The survey design required 157 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 16 of 18 FSS Summary Report

Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dpm/100 cm 2): N/A Ambient Background Used (dpmn/I00 cm 2): N/A Average Ambient BKG = 0 Actual Direct Measurements (N): 157 Median (Unity): 0.142 Mean (Unity): 0.162 Direct Measurement Standard Deviation 0.078 (Unity):

Total Standard Deviation (Unity): 0.078 Based on samples and backgrounds.

Maximum (Unity): 0.711 Material Type: N/A Background Subtract Not Applied Sign Test Final N Value: 157 S+ Value: 157 Critical Value: 89 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 17 of 18 FSS Summary Report

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 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. Therefore 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. All of the direct measurements were less than Unity 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 F8110114 meets the release criteria of 10CFR20.1402.

Page 18 of 18 FSS Summary Report

Attachment I Maps February 19, 2009 Survey Unit F8110114

Reactor Building K

00 Scans were performed under Survey F8110113 Containment Liner Floor/Wall Interface

-26' 6" ISOCS Scans F8110114-M1

Reactor Building

ýt, 0

-

-

- .*. ---- .-- - - -\

,

10h It 00 Containment Liner Floor 15 m Radius

-26'.6" ISOCS Scans F8110114-M2

Reactor Building ctD CPý ii* ~ ..L q-l.----

_ ---- \'i / ,.

00 Containment Liner Floor 12 m Radius 00 -26'6"ISOCS Scans F8110114-M3

Reactor Building CD, C_ -.n...

>U 1F'1 7 7 I I

~Containment 9 mn Radius Liner Floor Scans

-26'6" ISOCS F8110114-M4

CJQ 24' diameter area under the reactor vessel - 12" of activated concrete removed.

I0 Containment Liner Floor 6 m Radius

-26' 6" ISOCS Scans F8110114-M5

Reactor Building 0D 0'

24' diameter area under the reactor vessel - 12" of activated concrete removed.

ooI 00 + = Center of RX Vessel Containment Liner Floor 3 m Radius

+ = Center of RX Building scan grid 107 -26' 6" ISOCS Scans F8110114-M6

Reactor Building CD~

00

- I* I Containment Liner Floor/Wall Interface 00 Coverage Map

-26'6"ISOCS Scans F8110031-M7

130 (D~ Reactor 0

33 T

N Q /

1 -134 ISOCS at 1m 135 ISOCS Gamma Scans 00

<-N 132 131 "B" SUMP

-26' 6" Elevation F8110114 - M8

112 115 Reactor Building o 1 14

~4' 1 1/4" 108 109 110 ISOCS at 1m

-e 117 - 126 24lm ISOCS 117 - 125 (odd numbered) measured 1.21m from southeast corner of sump to west.

111 118 - 126 (even numbered) 0.67m from sump floor from odd numbered location tISOCS at 1.5m 125 108 - 116 + 160 114 116 ISOCS Scans Emergency Sump

<--N -26' 6" Elevation F8110114 - M9

Reactor Building 0

01GS 02GS t N

II' 08GS 09GS 1OGS 0

03GS 07GS 04GS 0- 3' --

3i 06GS

' 05GS OE .5' 44-10 Particle Gamma Scans It

<-N "B" SUMP

-26' 6" Elevation F8110114 - M10

Reactor Building ctD 12' 3" 12'3" C> 11GS 12GS 13GS 14GS T

28GS 15GS N

29GS 30GS 31GS 27GS 16GS 32GS 33GS 34GS 17GS 16' 26GS

-e 25GS 1 35GS 36GS 37GS 24GS 19GS S

  • P -

4' 1 1/4" 23GS 22GS 21GS 20GS 44-10 Gamma Scans It 00 Emergency Sump

-26' 6" Elevation F8110114 - Mll

UQ 00G 41GS 42GS 43GS

  • 44GS 4GS 4G47GS I I 49GS pS 51OS

> 5IGS r5GS

~5,5Gs

~57GS*

63GS

  • 64GS 67GS 68G$

69GSI 70GS II 00* Containment Floor

~44-10 Particle Scan 7* F8110114 - M12

0 k)

Area of activated concrete removal Emer(

Sul 00 00 Containment Floor 44-10 Particle Scan F8110114 - M13

(D0 ct1 0

107GS 108GS 109GS 110GS 111GS 112GS 11 3GS 114GSI I 115GSI I 116GS 117GS

~121GS

~122GS 123GSi

2SGS 29GS 30GS 31GrS J *32GS I ~133G*

135GS-I 136GS

~44-10 Particle Scan

~F8110114-M14

0 Ijec~j IArea of activated concrete removal Emergency Sump 00 Containment Floor 44-10 Particle Scan F8110114 - M15

Reactor Building

  • ]U

- *----

...*.....

C)

  • "' U'I, 0
  • i

~

X - Center of Containment 03GD is measured 5.5m from the center of the Equipment Hatch and 13.32m from the north wall. All other points are measured 5m on center.

00 Containment Liner Floor

-26' 6" Gamma Direct/Smears F8110114-M16

0D Reactor Building 00 0d ISOCS scans 1 meter from the remaining concrete after the removal of the activated concrete to -12" 136 - 148 centered on the juncture Center of of the floor/wall.

concrete 149 - 156 at 1.8 meter radius III 00 Containment Liner Floor

-26' 6" ISOCS Scans F8110114-M17

(t~

Reactor 0

cj~ ISOCS scans 0.5 meter for Eu-152 measurements Center of activated, concrete It CO Containment Liner Floor

-26' 6" ISOCS Scans F8110114-M18

(D Reactor 0

ISOCS scans 0.5 meter for Eu-152 measurements Center of concrete 00 Containment Liner Floor

-26' 6" ISOCS Scans F8110114-M19

Attachment 2 Instrumentation February 19, 2009 Survey Unit F8110114

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

M2350; 193700 44-10; 256101 N/A 5 pCi/g M2350; 203482 44-10; 211672 N/A 5 pCi/g M2350; 203481 44-10; 171992 N/A 5 pCi/g M2350; 175834 43-68B; 190482 433 1033 M2350; 175834 43-116-IB; 190642 796 3258 Tennelec; 0401171 N/A 5 dpm ca, 9 dpm f3 N/A Detector Detector Model No. Serial No.

Concrete- 1240 dpm/100 cm 2 Cs-137, ISOCS N/A 1983920 Concrete- 1150 dpm/100 cm2 Co-60 Concrete- 3740 dpm/100 cm 2 Eu-152t Table 2-2. Investigation Criteria and DCGL Value Parameter dp (dpm/100 cm 2 )

luec2 Investigation Criteria - Direct 640700 Investigation Criteria - Scan 640700 DCGLw 43000 DCGLEMC 640700 Page 2 of 2 Att. 2 Instrumentation F8110114

Attachment 3 Investigation February 19, 2009 Survey Unit F8110114 (none required)

Attachment 4 Data Assessment February 19, 2009 Survey Unit F8110114

F8110114 Gross Activity Sample Results Quantile Plot 0 DCGL = 43000 dpm/1 00cm2 6,000 5,000 I

I+)

4,000 3,000 4-cj~

2,000 1,000 985 0

0 20 40 60 80 100 Percentile 00

  • Direct Measurements (dpm/l0cm2) -median -_ _ 75th Percentile .... 50th Percentile

CD o F8110114 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpmllf0cm=

6000 0

5000-E 4000- 0 2 0

- - -- 3212

-P:

3000- o Oo r+ E= 0 o-0 0o 0 0

0 0 00 0

'i-Vo 2000 0 0 0 0 M 0-0 0 00 0- - 0 1185 c(n 1000 0 0o (,0 0'C "oo0

ýI a **C 0

-B51

-1000

-*fnnn

~A.%5 %FU

& ..

-A Measurement Locations 00 o Gross Activity - Average - - "+3StDev" - - "-3StDev"j A

0 3/4 F8110114 Gross Activity Frequency Plot 0

3/4 DCGL = 43000 dpm/1 00cm 2 90 85 80 75 70 65 0~ 60 C) 55 3/4 w 50 0 C 45 0 40 Co (U 35 0

Cl) 30 CD 25 6 20 15 10 5

0 C It N N (f

ot 00 N 1:

Bins - Upper End Value (dpm/1 00cm2)

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