ML090930662

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
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ML090830613	List: ML090830313 ML090830314 ML090830316 ML090830318 ML090830319 ML090830320 ML090830321 ML090830322 ML090830323 ML090830324 ML090830541 ML090830542 ML090830543 ML090830544 ML090830545 ML090830546 ML090830547 ML090830548 ML090830573 ML090850549 ML090850550 ML090850551 ML090850552 ML090850553 ML090850554 ML090850555 ML090850556 ML090850557 ML090850558 ML090850559 ML090850560 ML090850561 ML090850562 ML090890534 ML090890535 ML090890536 ML090890537 ML090890539 ML090890584 ML090890585 ML090890586 ML090890587 ML090890588 ML090890727 ML090900729 ML090900730 ML090900731 ML090900732 ML090900733 ML090900770 ... further results
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DPG 09-097
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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 cm 2.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 cm 2.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 m 2 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 Survey Unit: Class: SU Area (m): Evaluator:.

DCGL (dpm/100 cm 2): Area Factor: Design DCGLemc (dpm/100 cm 2): LBGR (dpm/100 cm 2): Design Sigma (dp'm/100 cm 2): Type I Error: Type II Error: Predominant Nuclide: Sample Area (mS): Scan Area (m 2): Scan Coverage (%):

Zl-0 : Sign P: Calculated Relative Shift: Relative Shift Used: N-Value: Design N-Value +

20%: Design Min Samples N: Grid Spacing L: 0114 1 1,125 G. Frank 43,000 14.9 640,700 21,500 31,920 0.05 0.05 Cs-137 8.34 1,125 100%1.645 1.645 0.725747 0.6 0.6 54 65 157 N/A Containment Floor, (-) 27'El.Structure Surface LTP Table 5-4 Gross Activity DCGL Class 1 Class I Default = 50% DCGL Class 1 Class I Uses 3.0 if Relative Shift is>3 NUREG-1575 Table 5-5 Class I 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 surfaceactivity 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 C0027GS C0028GS C0029GS C0030GS C0031GS C0032GS C0033GS C0034GS C0035GS C0036GS C0037GS C0038GS C0039GS C0040GS C0041GS C0042GS C0043GS C0044GS C0045GS C0046GS C0047GS C0048GS C0049GS C0050GS C0051GS C0052GS C0053GS C0054GS C0055GS C0056GS 970 925 1,000 1,110 888 1,110 644 503 505 1,040 995 459 1,040 493 506 491 1,070 472 453 485 1,000 798 534 491 449 978 978 467 961 549 429 970 925 1,000 1,110 888 1,110 1,656 1,378 774 1,040 995 931 1,040 1,134 1,151 828 1,070 1,015 1,403 816 1,000 798 1,742 1,587 958 978 978 716 961 724 985 581 493 401 409 453 460 404 427 482 400 556 520 410 376 411 408 0.017 0.017 0.018 0.020 0.016 0.020 0.030 0.025 0.014 0.019 0.018 0.017 0.019 0.020 0.021 0.015 0.019 0.018 0.025 0.015 0.018 0.014 0.031 0.029 0.017 0.018 0.018 0.013 0.017 0.013 0.018 628 683 469 675 566 683 683 666 683 628 628 683 469 520 647 647 647 588 588 647 666 608 910 666 647 544 628 628 495 666 608 0.041 0.045 0.031 0.044 0.037 0.045 0.045 0.044 0.045 0.041 0.041 0.045 0.031 0.034 0.043 0.043 0.043 0.039 0.039 0.043 0.044 0.040 0.060 0.044 0.043 0.036 0.041 0.041 0.033 0.044 0.040 2,400 2,680 2,320 2,310 2,510 2,590 2,500 2,280 2,690 2,640 2,590 2,530 2,570 2,680 2,480 2,480 2,170 2,150 2,170 2,740 2,260 2,800 2,800 2,550 2,560 2,440 2,530 1,920 2,530 2,710 2,220 0.075 0.084 0.073 0.073 0.079 0.081 0.079 0.072 0.085 0.083 0.081 0.080 0.081 0.084 0.078 0.078 0.068 0.068 0.068 0.086 0.071 0.088 0.088 0.080 0.081 0.077 0.080 0.060 0.080 0.085 0.070 0.134 0.146 0.122 0.137 0.132 0.146 0.153 0.140 0.143 0.143 0.141 0.141 0.130 0.139 0.141 0.135 0.130 0.125 0.132 0.143 0.133 0.142 0.179 0.153 0.140 0.130 0.138 0.115 0.129 0.142 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 I Value Value Value C0057GS C0058GS C0059GS C0060GS C0061 GS C0062GS C0063GS C0064GS C0065GS C0066GS C0067GS C0068GS C0069GS C0070GS C0071 GS C0072GS C0073GS C0074GS C0075GS C0076GS C0077GS C0078GS C0079GS C0080GS C0081 GS C0082GS C0083GS C0084GS C0085GS C0086GS C0087GS 447 934 1,100 1,120 1,210 425 443 413 555 1,210 462 1,070 496 961 907 987 558 925 420 888 787 879 509 520 484 995 1,150 509 552 1,040 527 562 934 1,100 1,120 1,210 491 975 599 1,106 1,210 528 1,070 496 961 907 987 889 925 420 888 787 879 1,156 691 551 995 1,150 780 552 1,040 742 341 319 411 335 471 341 440 462 393 355 403 404.0.010 0.017 0.020 0.020 0.022 0.009 0.018 0.011 0.020 0.022 0.009 0.019 0.009 0.017 0.016 0.018 0.016 0.017 0.008 0.016 0.014 0.016 0.021 0.012 0.010 0.018 0.021 0.014 0.010 0.019 0.013 608 495 628 705 608 588 626 705 701 734 608 544 608 588 720 647 643 647 666 683 469 590 628 628 628 675 683 588 675 701 690 0.040 0.033 0.041 0.046 0.040 0.039 0.041 0.046 0.046 0.048 0.040 0.036 0.040 0.039 0.047 0.043 0.042 0.043 0.044 0.045 0.031 0.039 0.041 0.041 0.041 0.044 0.045 0.039 0.044 0.046 0.045 2,010 2,660 2,440 2,640 2,680 2,440 2,680 2,510 2,660 2,760 2,440 1,990 2,200 2,500 2,340 2,480 2,660 2,310 2,680 2,320 2,280 2,200 2,570 2,620 2,460 2,380 2,260 2,400 2,500 2,550 2,510 0.063 0.084 0.077 0.083 0.084 0.077 0.084 0.079 0.084 0.087 0.077 0.063 0.069 0.079 0.074 0.078 0.084 0.073 0.084 0.073 0.072 0.069 0.081 0.082 0.077 0.075 0.071 0.075 0.079 0.080 0.079 0.113 0.133 0.138 0.150 0.146 0.124 0.143 0.136 0.150 0.157 0.126 0.118 0.118 0.135 0.137 0.138 0.142 0.132 0.136 0.134 0.117 0.124 0.143 0.136 0.129 0.137 0.137 0.128 0.133 0.145 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 C0089GS C0090GS C0091 GS C0092GS C0093GS C0094GS C0095GS C0096GS C0097GS C0098GS C0099GS COIOOGS C0101GS C0102GS C0103GS C0104GS C0108GS C01 09GS C0110GS C0111GS C0112GS C0113GS C0114GS CO 15GS C0116GS CO117GS C0118GS C0119GS C0120GS C0121GS 987 494 541 489 916 787 1,100 577 1,140 1,090 1,010 888 1,120 961 943 606 446 586 505 519 1,000 1,240 967 428 538 418 551 614 569 743 1,140 987 1,202 1,396 967 916 787 1,100 1,883 1,140 1,090 1,010 888 1,120 961 943 1,322 864 2,270.1,984 1,452 1,000 1,240 967 428 2,955 963 1,204 1,371 871 985 1,140 464 508 426 589 521 393 644 581 509 0.018 0.022 0.025 0.017 0.016 0.014 0.020 0.034 0.021 0.020 0.018 0.016 0.020 0.017 0.017 0.024 0.016 0.041 0.036 0.026 0.018 0.022 0.017 0.008 0.053 0.017 0.022 0.025 0.016 0.018 0.021 718 701 734 647 628 566 608 701 766 718 683 690 852 796 628 356 588 765 717 852 717 826 749 765 920 665 384 1150 396 448 1010 702 1,554 1,494 981 255 354 432 275 0.047 0.046 0.048 0.043 0.041 0.037 0.040 0.046 0.050 0.047 0.045 0.045 0.056 0.052 0.041 0.046 0.039 0.050 0.047 0.056 0.047 0.054 0.049 0.050 0.061 0.044 0.102 0.076 0.098 0.065 0.066 3,000 2,760 2,310 2,680 2,040 2,130 2,460 2,840 2,960 2,960 2,680 2,400 2,710 3,050 3,020 2,970 2,510 2,330 2,610 2,290 2,310 2,170 2,560 2,550 2,570 2,660 2,570 2,310 3,190 3,190 1,660 0.094 0.087 0.073 0.084 0.064 0.067 0.077 0.089 0.093 0.093 0.084 0.075 0.085 0.096 0.095 0.093 0.079 0.073 0.082 0.072 0.073.0.068 0.081 0.080 0.081 0.084 0.081 0.073 0.100 0.100 0.052 0.159 0.155 0.146 0.144 0.122 0.118 0.137 0.169 0.164 0.160 0.147 0.137 0.161 0.166 0.153 0.163 0.133 0.164 0.165 0.154 0.138 0.145 0.147 0.138 0.194 0.145 0.205 0.173 0.214 0.183 0.139 722 400 484 435 358 890.3. a u a &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 C0123GS C0124GS C0125GS C0126GS C0127GS C0128GS C0129GS C0130GS C0131GS C0132GS C0133GS C 134GS C0135GS C 0136GS C0137GS C0138GS C0139GS C0140GS C0141GS C0142GS C0143GS C0144GS C0145GS C0146GS C0147GS C0148GS C0149GS C0150GS C0151GS C0152GS 524 535 465 940 428 490 949 827 465 603 500 1,140 619 447 1,020 1,030 816 837 904 949 592 895 696 795 866 740 886 1,040 984 876 793 2,163 679 1,103 940 472 697 949 827 1,050 2,326 1,144 1,140 3,033 1,947 1,020 1,030 816 837 904 949 592 895 734 795 866 740 886 1,040 984 876 2,385 611 398 438 317 382 430 656 457 753 561 353 596 0.039 0.012 0.020 0.017 0.008 0.013 0.017 0.015 0.019 0.042 0.021 0.021 0.055 0.035 0.018 0.019 0.015 0.015 0.016 0.017 0.011 0.016 0.013 0.014 0.016 0.013 0.016 0.019 0.018 0.016 0.043 465 736 882 798 610 589 667 702 667 667 610 425 377 610 498 777 589 649 630 473 470 610 545 545 649 545 685 448 558 471 459 2,967 490 1,973 1,080 2,087 1,509 1,054 3,270 2,633 2,337 1,719 398 305 509 440 276 536 544 547 464 0.195 0.048 0.058 0.053 0.040 0.039 0.044 0.046 0.044 0.044 0.040 0.130 0.071 0.040 0.137 0.051 0.039 0.043 0.041 0.099 0.069 0.040 0.036 0.036 0.043 0.036 0.045 0.215 0.173 0.154 0.113 2,840 2,310 2,600 2,280 2,300 2,670 2,570 2,310 2,570 2,460 2,600 2,570 2,900 2,550 2,500 2,310 2,340 2,440 2,280 2,650 2,490 2,300 1,850 2,180 2,200 2,160 2,400 2,080 1,650 1,620 3,740 3,840 7,620 5,312 3,875 1,670 1,810 1,040 1,010 0.089 0.073 0.082 0.072 0.072 0.084 0.081 0.073 0.081 0.077 0.082 0.081 0.091 0.080 0.121 0.073 0.074 0.077 0.072 0.083 0.078 0.072 0.058 0.069 0.069 0.068 0.075 0.240 0.167 0.122 0.118 0.323 0.133 0.160 0.141 0.121 0.135 0.142 0.134 0.144 0.163 0.142 0.231 0.217 0.155 0.276 0.142 0.127 0.134 0.129 0.200 0.158 0.129 0.107 0.119 0.127 0.117 0.136 0.473 0.358 0.291 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 Co-60 Activity Range 375 to 5,361 dpm/100 cm 2 Eu-152 Activity Range 1,660 to 10,260 dpm/100 cm 2 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 52 Surrogate Activity (pCi/g)DCGLw 7.70 Mean 2.01 Median 1.52 Standard 1.37 Deviation Eu-1 52 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 F8110114C0002SM

F8110114C0003SM F8110114C0004SM F8110114CO005SM F8110114C0006SM F8110114C0007SM F8110114C0008SM F8110114C0009SM F8110114C0010SM F8110114CO01ISM F8110114CO012SM F8110114C0013SM F8110114C0014SM F8110114CO015SM F8110114CO016SM F8110114CO017SM

F8110114CO018SM F8110114C0019SM F8110114C0020SM F8110114C0021SM F8110114C0022SM F8110114C0023SM F8110114C0024SM F8110114C0025SM F8110114C0026SM F8110114C0027SM F8110114C0028SM F8110114C0029SM F8110114CO030SM Mean: Median: Standard Deviation:

Range: 38.45 2.29 3.58-0.29 38.45 20.37-0.29 1 3.58 10.04 7.46-1.58 3.58 4.87 1 4.87 1-0.29 6.16 10.04 4.87 1 1 7.46 4.87-1.58 3.58 7.46 2.29 6.16 6.38 3.58 9.76-1.58 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: 89Sufficient 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? YesReject 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 1OCFR20.1402.

Page 18 of 18 FSS Summary Report Attachment I Maps February 19, 2009 Survey Unit F8110114 00 Reactor Building K Scans were performed under Survey F8110113 Containment Liner Floor/Wall Interface-26' 6" ISOCS Scans F8110114-M1 0ýt, Reactor Building , ------- -.-- --\10h Containment Liner Floor 15 m Radius-26'.6" ISOCS Scans F8110114-M2 It 00 ctD CPýReactor Building~ ----_ .. q-l. ---- \' / ,.i L Containment Liner Floor 12 m Radius-26'6" ISOCS Scans F8110114-M3 00 00 Reactor Building CD, C_ -. ------ n...;>U 7 7 1F'1 I I~Containment Liner Floor 9 mn Radius-26'6" ISOCS Scans F8110114-M4 CJQ 24' diameter area under the reactor vessel -12" of activated concrete removed.Containment Liner Floor 6 m Radius-26' 6" ISOCS Scans F8110114-M5 I0 0D 0'Reactor Building 24' diameter area under the reactor vessel -12" of activated concrete removed.ooI 00+ = Center of RX Vessel+ = Center of RX Building scan grid 107 Containment Liner Floor 3 m Radius-26' 6" ISOCS Scans F8110114-M6 CD~00 Reactor Building------ ----- I Containment Liner Floor/Wall Interface Coverage Map-26'6" ISOCS Scans F8110031-M7 00 (D~0 00 130 Reactor 33-134 T N Q /1 ISOCS at 1m 135<-N 132 131 ISOCS Gamma Scans"B" SUMP-26' 6" Elevation F8110114 -M8 112 o 1 14~4' 1 1/4" 115 Reactor Building 108 109-e 110 ISOCS at 1m 117 -126 24 lm ISOCS 117 -125 (odd numbered)measured 1.21m from southeast corner of sump to west.118 -126 (even numbered) 0.67m from sump floor from odd numbered location 111 125 tISOCS at 1.5m 108 -116 + 160 114 116 ISOCS Scans Emergency Sump-26' 6" Elevation F8110114 -M9<--N 0 Reactor Building t 01GS 02GS N I I'08GS 0 03GS 09GS 1OGS 07GS 04GS 0- 3' --i 3'06GS 05GS OE .5'It<-N 44-10 Particle Gamma Scans"B" SUMP-26' 6" Elevation F8110114 -M10 ctD C>Reactor Building 12' 3" 11GS 12GS 12'3" 13GS 14GS T N-e 16'28GS 15GS 29GS 30GS 31GS 27GS 16GS 26GS 32GS 33GS 34GS 17GS 25GS 1 35GS 36GS 37GS 24GS 19GS S

• P -4' 1 1/4" 23GS 22GS 21GS 20GS It 00 44-10 Gamma Scans Emergency Sump-26' 6" Elevation F8110114 -Mll UQ 00G pS 41GS 42GS 43GS 44GS 4GS 4G47GSI I 49GS 51OS> 5IGS r5GS~5,5Gs63GS 64GS 67GS 68G$69GSI 70GS IIContainment Floor~44-10 Particle ScanF8110114 -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 I 135GS-I 136GS~44-10 Particle Scan~F8110114-M14 0 00 I jec~j IArea of activated concrete removal Emergency Sump Containment Floor 44-10 Particle Scan F8110114 -M15 C)Reactor Building........ *"' 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.Containment Liner Floor-26' 6" Gamma Direct/Smears F8110114-M16 00 0D 00 0d Reactor Building Center of concrete ISOCS scans 1 meter from the remaining concrete after the removal of the activated concrete to -12" 136 -148 centered on the juncture of the floor/wall.

149 -156 at 1.8 meter radius Containment Liner Floor-26' 6" ISOCS Scans F8110114-M17 III 00 (t~0 cj~Reactor Center of activated, concrete ISOCS scans 0.5 meter for Eu-152 measurements Containment Liner Floor-26' 6" ISOCS Scans F8110114-M18 It CO 0 (D Reactor Center of concrete ISOCS scans 0.5 meter for Eu-152 measurements Containment Liner Floor-26' 6" ISOCS Scans F8110114-M19 00 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/gM2350; 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 cm 2 Co-60 Concrete-3740 dpm/100 cm 2 Eu-152t Table 2-2. Investigation Criteria and DCGL Value Parameter dp lue cm 2)(dpm/100 c2 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 0 I+)cj~00 F8110114 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpm/1 00cm 2 I 4-6,000 5,000 4,000 3,000 2,000 1,000 0 985 0 20 40 60 80 100 Percentile

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

.... 50th Percentile CD o r+-P: c(n aýI 00-A A F8110114 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpmllf0cm=

E 2 E='i-M Vo**C 6000 5000-4000-3000-2000 1000 0-1000 0 0 0-----------------------------------------------------

---

o Oo 0o 0 0 0 0 0 0 0 o-0 0 0 0 0 0 0 0-0 0 00 0- -0 0o (,0 0'C "oo0 3212 1185-B51& ..~A.%5 %FU Measurement Locations o Gross Activity -Average --"+3StDev" --"-3StDev"j 03/403/43/40 Co 0 Cl)CD F8110114 Gross Activity Frequency Plot DCGL = 43000 dpm/1 00cm 2 0~C)w C 0 (U 6 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 C N N (f It N 1: ot 00 Bins -Upper End Value (dpm/1 00cm2)