ML090930071

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Final Status Survey Summary Report for February 16, 2009, Containment Interior Walls, (-) 27' El. to (+) 25' El., Survey Unit F8110113
ML090930071
Person / Time
Site: Rancho Seco
Issue date: 02/17/2009
From: Donna Anderson
Sacramento Municipal Utility District (SMUD)
To:
NRC/FSME
Shared Package
ML090830613 List: ... further results
References
DPG 09-097
Download: ML090930071 (39)
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Rancho Seco Final Status Survey Summary Report February 16, 2009 Containment Interior Walls, (-) 27' El. to (+) 25' El.Survey Unit F8110113 Prepared By: D ate: z//7/Zd69 FSS Engineer Reviewed 3 Date: 1 09-3 Qej Lead FSS Engineer Approved By: Date: _ -__7 Dismantlement S5erintendent, Radiological FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit: F8110113, Containment Interior Walls, (-) 27' El. to (+) 25' 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 cm2 and a maximum value of 8,134,000 dpmI100 cm2. Direct measurements on the grade elevation showed a mean gross activity level of 201,670 dpm/100 cm2 and a maximum value of 370,000 dpm/100 cm2. Direct measurements on the +40' elevation showed a mean gross activity level of 51,521 dpm/100 cm2 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 cm2 and a maximum value of 46,660 dpm!l00 cm2. Direct measurements on the exterior roof showed a mean gross activity level of 1,364 dpm/100 cm2 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 1,762 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 12 FSS Summary Report F8110113 Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F811 Survey Unit: Class: SU Area (m2): Evaluator:

DCGL (dpm/100 cm 2): Area Factor: Design DCGLemc (dpm/100 cm 2): LBGR (dpm/100 cm 2): Design Sigma (dpm/100 cm 2): Type I Error: Type II Error: Predominant Nuclide: Sample Area (M 2): Scan Area (M 2): Scan Coverage (%): Sign P: Calculated Relative Shift: Relative Shift Used: N-Value: Design N-Value + 20%: Design Min Samples N: Grid Spacing L: 0113 1 1,762 D. Anderson 43,000 14.9 640,700 21,500 33,040 0.05ý0.05 Cs-137 19.6 1,762 100%1.645 1.645 0.725747 0.6 0.6 54 65 180 N/A Containment Interior Walls, (-) 27' El. to (+) 25' El.Structure Surface LTP Table 5-4 Gross Activity DCGL Class 1 Class I Default = 50% DCGL Class 1 Class 1 Uses 3.0 if Relative Shift is>3 NUREG-1575 Table 5-5 Class 1 Class 1 Page 3 of 12 FSS Summary Report F8110113 Survey Results: A total of 180 direct measurements were made in F8110113.

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 ISOCS gamma measurements on the interior wall surfaces indicated areas of elevated activity.

Co-60 was not identified above the MDC.Beta scan activity on the penetrations and horizontal surfaces ranged from 1,131 to 1,085,884 dpmr/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.Table 2. Direct Measurement Results Measurement ID Gross Activity Uncertainty (dpm/100 cm ) (dpm/100 cm 2)F8110113-MOOOIGS 3,637 726 F8110113-MOO02GS 2,456 587 F8110113-MOO03GS 560 294 F8110113-MOO04GS

< 635 F8110113-MO005GS

< 726 F8110113-MOO06GS

< 752 F8110113-MOO07GS

< 642 F8110113-MOO08GS 789 318 F8110113-M0009GS 603 293 F8110113-MOOl0GS 1,632 455 F8110113-MOO11GS 1,238 412 F8110113-MOO12GS 1,379 424 F8110113-MOOl 3GS 1,825 489 F8110113-MOO14GS 2,186 527 F8110113-MOOl5GS 2,397 565 F8110113-MOO16GS 1,395 423 F8110113-MOO17GS 2,601 593 F8110113-MOO18GS 4,422 820 F8110113-MOO19GS 2,466 573 F8110113-MOO20GS 1,236 397 F8110113-MOO21GS 1,527 446 F8110113-MOO22GS 4,284 816 F8110113-MOO23GS 3,136 666 F8110113-MOO24GS 1,164 385 F8110113-MOO25GS 3,609 716 F8110113-MOO26GS 3,491 706 F8110113-MOO27GS 7,305 1189 F8110113-MOO28GS 6,114 1036 F8110113-MOO29GS 4,789 869 F8110113-MOO30GS 1,198 384 F8110113-MOO31GS

< 693 F8110113-MOO32GS

< 759 F8110113-MOO33GS

< 726 F8110113-MOO34GS 610 295 F8110113-M0035GS 723 329 Page 4 of 12 FSS Summary Report F8110113 Measurement ID Gross Activity Uncertainty (dpm/100 cm (dpm/100 cm 2)F8110113-MOO36GS 1,683 459 F8110113-MOO37GS 982 356 F8110113-MOO38GS 1,236 408 F8110113-M0039GS

< 686 F8110113-M0O40GS

< 627 F8110113-MOO41GS

< 713 F8110113-MOO42GS

< 706 F8110113-M0043GS

< 720 F8110113-M0044GS

< 713 F8110113-MOO45GS 797 331 F8110113-M0046GS 2,459 569 F8110113-MOO47GS 1,535 441 F8110113-MOO48GS 1,364 427 F8110113-M0049GS 2,031 507 F8110113-MOO50GS 2,461 577 F8110113-MOO51GS 2,311 558 F8110113-M0052GS 2,592 593 F8110113-MOO53GS 2,740 621 F8110113-MOO54GS 3,232 677 F8110113-M0055GS 2,427 562 F8110113-MOO56GS 1,494 440 F8110113-MOO57GS 1,280 412 F8110113-M0058GS 4,502 849 F8110113-MOO59GS 4,211 805 F8110113-MOO60GS 1,137 394 F8110113-MO061 GS 2,082 515 F8110113-MOO62GS 3,876 766 F8110113-MOO63GS 12,308 1802 F8110113-M0064GS 7,814 1250 F8110113-MOO65GS 3,896 759 F8110113-MOO66GS 895 340 F8110113-MOO67GS

< 765 F8110113-M0068GS

< 713 F8110113-M0069GS

< 700 F8110113-MOO70GS 714 316 F8110113-MOO71GS

< 836 F8110113-MOO72GS 1,082 374 F8110113-MOO73GS

< 642 F8110113-MOO74GS 978 373 F8110113-MOO75GS

< 700 F8110113-M0076GS

< 619 F8110113-M0077GS

< 819 F8110113-MOO78GS

< 706 F8110113-MOO79GS

< 726 F8110113-MO080GS 602 303 F8110113-MOO81GS

< 807 F8110113-MOO82GS 1,134 389 F8110113-M0083GS 1,776 496 F8110113-MOO84GS 1,205 382 F8110113-MOO85GS 2,069 535 F8110113-MOO86GS 2,241 551 F8110113-M0087GS 852 331 Page 5 of 12 FSS Summary Report F8110113 Measurement ID Gross Activit Uncertainty (dpmll00 cm ) (dpm/100 cm 2)F8110113-MOO88GS 2,488 576 F8110113-MOO89GS 4,437, 840 F8110113-MOO90GS 2,207 540 F8110113-M0091GS 1,891 501 F8110113-MOO92GS

< 657 F8110113-MOO93GS

< 657 F8110113-MOO94GS 3,992 777 F8110113-MOO95GS 3,703 745 F8110113-MOO96GS

< 912 F8110113-MOO97GS 3,002 648 F8110113-MOO98GS 5,510 964 F8110113-MOO99GS 7,601 1229 F8110113-MO100GS 2,889 626 F8110113-MO101GS 2,585 605 F8110113-MO102GS 867 354 F8110113-MO103GS

< 713 F8110113-MO104GS

< 595 F8110113-MO105GS 477 272 F8110113-M016GS 695 335 F8110113-MO107GS 897 350 F8110113-MO108GS

< 830 F8110113-MO109GS

< 693 F8110113-MOIIOGS 671 310 F8110113-MO111GS

< 672 F8110113-M0112GS

< 672 F8110113-M0113GS

< 937 F8110113-M0114GS 1,018 369 F8110113-MO115GS

< 700 F8110113-M0116GS 790 340 F8110113-MOI17GS 964 371 F8110113-M0118GS 975 370 F8110113-M0119GS 1,431 423 F8110113-MO120GS 1,414 436 F8110113-MO121GS 2,579 605 F8110113-MOl22GS 2,468 581 F8110113-MO123GS 739 324 F8110113-MOl24GS 1,133 375 F8110113-MO125GS 3,769, 751 F8110113-MOI26GS

< 752 F8110113MOI27GS 504 273 F8110113-MOl28GS 394 276 F8110113-MO129GS 1,034 375 F8110113-MO130GS 2,598 602 F8110113-MOl31GS 3,278 680 F8110113-MO132GS 791 365 F8110113-MO133GS 3,002 637 F8110113-MO134GS 5,992 1021 F8110113-MO135GS 7,317 1188 F8110113-MO136GS 3,547 717 F8110113-MO137GS.

2,754 611 F8110113-MO138GS 1,258 395 F8110113-MOI39GS 807 321 Page 6 of 12 FSS Summary Report F8110113 Measurement ID Gross Activi Uncertainty (dpm/l00 cm (dpm/I00 cm 2)F8110113-M0140GS F8110113-MO141GS F8110113-MO142GS F8110113-MO143GS F8110113-MO144GS F8110113-MO145GS F8110113-M0146GS F8110113-MO147GS F8110113-MO148GS F8110113-MO149GS F8110113-MO150GS F8110113-MOI5IGS F8110113-MO152GS F8110113-MOl 53GS F8110113-MO154GS F8110113-MO155GS F8110113-MOI56GS F8110113-MO157GS F8110113-MOl 58GS F8110113-MOI59GS F8110113-MO160GS F8110113-MOl 61 GS F8110113-M0162GS F8110113-MO163GS F8110113-MO164GS F8110113-M0165GS F8110113-MOl 66GS F8110113-M0167GS F8110113-MO168GS F8110113-MO169GS F8110113-MOI70GS F8110113-M0171GS F8110113-MO172GS F8110113-MO173GS F8110113-MO174GS F8110113-MO175GS F8110113-MO176GS F8110113-MO177GS F8110113-MO178GS F8110113-MO179GS F8110113-MO180GS Mean: Median: Standard Deviation:

Range:< 739 1,316 562 942 992 939 773< 630 615< 789 848 1,338 2,013< 969 2,909 1,908 2,373 894 1,523 2,183 2,809 5,970 2,227 2,425 1,319 3,569 5,869 1,740 2,468 4,211 6,954 3,440 2,779 4,372 1,959 1,222 1,271 1,968 1,468 2,450 1,839 2,004 1,317 1,758 394 to 12,308 400 281 346 388 355 324 314 344 424 506 634 499 557 337 429 535 618 1022 549 579 398 721.1014 490 583 805 1141 698 621 827 504 405 418 492 430 583 493 Page 7 of 12 FSS Summary Report F8110113 Table 3. Removable Surface Activity Results Measurement ID Surface Beta Activity (dpm/100 cm 2)F8110113-M0001 SM 16.50 F8110113-M0002SM 12.62 F8110113-MOO03SM 37.16 F8110113-MOO04SM 59.11 F8110113-MOOO5SM 16.50 F8110113-MOO06SM 3.58 F8110113-MOO07SM 19.08 F8110113-MOO08SM 3.58 F8110113-MOO09SM 28.12 F8110113-MOOIOSM 8.75 F8110113-MOOl1 SM 22.95 F8110113-MOO12SM 31.99 F8110113-MOO13SM 43.62 F8110113-MOO14SM 10.04 F8110113-MOO15SM 3.58 F8110113-MOO16SM 12.62 F8110113-MOO17SM 12.62 F8110113-MOO18SM 19.08 F8110113-MOO19SM 24.24 F8110113-MOO20SM 38.45 F8110113-M0021 SM 145.64 F8110113-MOO22SM 95.27 F8110113-MOO23SM 78.49 F8110113-MOO24SM 50.07 F8110113-MOO25SM 42.33 F8110113-MOO26SM 21.66 F8110113-MOO27SM 2.29 F8110113-MOO28SM 50.07 F8110113-MOO29SM 1.00 F8110113-MOO30SM 55.24 F8110113-MOO31SM 33.28 F8110113-MOO32SM 26.83 F8110113-MOO33SM 37.16 F8110113-MOO34SM 41.03 F8110113-MOO35SM 48.78 F8110113-MOO36SM 55.24 F8110113-MOO37SM 30.70 F8110113-MOO38SM 13.91 F8110113-MOO39SM 25.54 F8110113-MOO40SM 38.45 F8110113-MOO41SM 30.70 F8110113-MOO42SM 11.33 F8110113-MOO43SM 55.24 F8110113-MOO44SM 118.52 F8110113-MOO45SM 30.70 F8110113-MOO46SM 19.08 F8110113-MOO47SM 29.41 F8110113-MOO48SM 34.58 Page 8 of 12 FSS Summary Report F8110113 Measurement ID Surface Beta Activity (dpm/100 cm 2)F8110113-M0049SM F8110113-MOO5OSM F8110113-M0051SM F8110113-MOO52SM F8110113-M0053SM F8110113-M0054SM F8110113-M0055SM F8110113-MOO56SM F8110113-M0057SM F8110113-M0O58SM F8110113-M0059SM F8110113-MOO60SM F8110113-MOO61SM F8110113-MOO62SM F8110113-M0063SM F8110113-M0064SM F8110113-M0065SM F8110113-MOO66SM F8110113-MOO67SM F8110113-MOO68SM F8110113-M0069SM F8110113-MOO70SM F8110113-M0071 SM F8110113-M0072SM Mean: Median: Standard Deviation:

Range: 29.41 35.87 37.16 19.08 48.78 70.74 21.66 10.04 37.16 21.66 20.37 1.00 21.66 16.50 13.91 17.79 31.99 19.08 21.66 48.78 79.78 21.66 30.70 41.03 32.84 28.76 25.59 1 to 145.64 Page 9 of 12 FSS Summary Report F8110113 Survey Unit Data Assessment:

The survey design required 180 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 10 of 12 FSS Summary Report F8110113 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): .180 Median (dpm/100 cm 2): .1,317 Mean (dpm/100 cm 2): 2,004 Direct Measurement Standard Deviation 1,758 (dpm/100 cm 2): Total Standard Deviation (dpm/100 cm 2): 1,758 Based on samples and backgrounds.

Maximum (dpm/100 cm 2): 12,308 Material Type: N/A Background Subtract Not Applied Sign Test Final N Value: 180 S+ Value: 180 Critical Value: 101 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 I I of 12 FSS Summary Report F8110113 Survey Unit Investigations and Results: Forty-four investigations (scan grids 70, 71, 102, 103, 108, 152, 176, 181,185, 200, 202, P031 exterior, P033 exterior, P034 exterior, P035 exterior, P036 exterior, P041 interior and exterior, P042 exterior, P044 exterior, P047 interior and exterior, P052 exterior, P053 exterior, P054 exterior, P063 exterior, P064 exterior, P080 exterior, 271, 274, 277, 279, 285, 286, 287, 289, 290, 291, 294, 296, 299, 300, and 326) were required for the scan measurements and the results are reported in Attachment

3. The EMC unity rule was not exceeded as shown in Table 3-1.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. Forty-four potential areas of elevated activity were detected and evaluated as shown in Attachment

3. 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! 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. Forty-four' investigations were required.The direct measurement data support rejection of the null hypothesis, providing high confidence that the survey unit satisfied the release criteria andthat the data quality objectives were met.-It is concluded that survey unit F8110113 meets the release criteria of 1OCFR20.1402.

Page 12 of 12 FSS Summary Report F8110113 Attachment 1 Maps February 16, 2009 Survey Unit F8110113 00 C,)0 Location of Containment Building inside the Industrial Area Map F8110113-1, Containment Building Location at Rancho Seco site 0 Distance above -27' El.Survey Unit F8110113 Lu ID numbers of polar crane supports 0 Lo al ID numbers of polar crane A -innnrt.q Distance in feet above 0 El.0 z-115ft.1011 12 131415 16 1718 1920 21 2223 2425;2627 2829 30 313233 3435 36 2 34 5 678 9-105 ft.-95ft.-85ft.-75ft.-f551.-55ft.-45 ft.Personnelý Hatch':' .. ... ..42 f. -12.80 nr 326f. -9.75mrn 225 ft-671rsm 125f. 3.6Gm.35 ft.25 ft.15ft.5 ft.-5 ft.-15 ft.-25 ft.(-) 27 El.Equipment Transfer Emergency Hatch Tubes Hatch 3.46 meters between hoiizontal centers 3.05 meters between vertical rows NOTE: Polar Crane supports are located every 10 degrees, are numbered in red and will be used to index gamma measurements.

falal Sean Area is approximately 1,762 square meters (to flood/wall interface).

S2 4 6a 00 Ujk Map F8110113-2, Reactor Containment Interior Walls ISOCS Gamma Scan Measurements F8110113MOO01GS to F8110113M0144GS 19.6 sq. meter field of view (D 0 Survey Unit F8110113 Distance in feet above 0 El.0 ID numbers of polar ID numbers of polar crane supports crane supports 115 f.6.- 6 ft.10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 1 2 3 4 5 6 7 8 9 AIN 2 0 0 N I 1 9 6' N NAN NA 9 N M 0 0 0 P M 9 1-85ft.-75ft.-65 ft.Personnel Hatch -5511.~ 45 ft.-35ft.Equipment

..- 25 f.Hatch .. ............Transfer Emergency 15 f.TubesHac-5 ft.... .. ... ... * ... ...-..f , , ......... .. .o (-27ý El. -5 3 25ft.3.46 meters between horizontal centers Measurements to be centered between polar crane supports and at floorlwall interface.

NO]E: Polar Crane supports are located every 10 degrees, are numbered in red and will be used to index gamma measurements.

Map F8110113-3, Reactor Containment Interior Walls-TJ ISOCS Gamma Scan Measurements 00 to F8110113MO180GS 12.6 sq. meter field of view clQ Survey Unit F8110113 Distance in feet above 0'El.C0 0 w U) z ID numbers of polar UID numbers of polar crane supports crane supports -15 ft.-. A .105 ft.10 11 12 13 14 15 16 17 18 19 20 21 22 23'24 25 .26 27 28 29 30 31 32 33 34 35 36 1 2 3 4 5 6 7 8 9-85ft.-75ft..- 65 .ft.Personnel Hatch -55 ft.-' '- 45 t.0 ,- 35 ft.Equipment

..- 25 ft.Hatch " ". ......... ..Transfer Emergency

-15 ft.Tabes Hatch 5 ft.m '- , .-.-.- .--I -.2 I .. 1 !t -;.... ....L'...i.~.LL*'4.

I " (-) 27 El--- ---__NOTE: Polar Crane supports are located every 10 degrees and are numbered In red.Map F8110113-4, Reactor Containment Interior Walls Location of Smear Measurements 00 2- F8110113MOO01SMtoF8110113MOO72SM (ED 0 2BS 3BS 11BS 413S 6BS 7BS 1OBS 11BS 5BS i 8BS 9BS I12BS 14BS I15BS 18BS 19BS 22BS 123BS 126BS 13BS.16BS 17BS 20BS 21BSI24BS 25BS Equipment Hatch Interior Surfaces 35BS 36BS 40BS 41BS I44BS 45BS 48BS 49BS 39BS 42BS 43BS 46BS 47BS 50BS Emergency Hatch Interior Surfaces 00 0 0.5 1.0 1.5 2.0 Distance in Meters Map F8110113-5, Reactor Containment Interior Walls Beta Scan Measurements F8110113MOOO1BS to F8110113MO03OBS, F8110113CO031BS to F8110113C0036BS and F8110113M0039BS to F8110113MO05OBS (2-Ij 0 CON Per~sornnet Hotch P128 0 0 0. 0 Q, q Q.0 0 0 0 0 0 0 0 0 P116 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 G 0 Penetrations to be surveyed under FSS Package F8110112 0 P115 el" 4-0 (,10 a-, IV"If P ,e 000 0 0 0 0.0. 0. 0 20' Etev.q,.0 A, 10 0 0 0 0 000ý 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Qý 0 0 0 0 0 0' E[ev. P63 P62 P61 P60 Penetrations to be surveyed under FSS Package F8110113 0. 0 0 Q 0 .0 0.' 0.'0 00000000 a z" I,' Q 4 Penetrations to be o o 0 o0 0 cO O o o D surveyed under FSS o 000 0 o .0 .,0000'0000 PackageF8110113

0. (g) 0. j 0 0. 0. 0-87' Etev.00 0= Penetration CLOSED from Rx Side= Penetration OPEN from Rx Side t SMUD SACRAMENTO MUNICIPAL UTILITY DISTRICT Rx Bldg. Inside View Penetrations MEASUREMENT LOCATIONS Map F8110113-6 PitLE: J G dnley FILES J Grinley (D1 00 0 0N P135 0 P134 0 P133 0ii 00`0 0 0 G qN"q q 000 0 0 P139 Transfer Tubes 0 P132 0 P131 Emergency Hatch P129 Q O P130 0' Etev.S= Penetration CLOSED from Rx Side= Penetration OPEN from Rx Side 00 1 JO SACRAMENTO MUNICIPAL UTILITY DISTRICT FILE: Inside Rx Bldg. View Penetrations MEASUREMENT LOCATIONS Map F8110113-7 J Genley 00 CVT o'w Map F8110113-8, Containment Interior Walls (-) 27' El. to (+) 25' El.Beta Scan Measurements of Penetrations F8110113PO130BS to F8110113PO132BS and F8110113PO136BS to F8110113PO1468S

-P-h cIl oto 00 0~Map F8110113-9, Containment Interior Walls (-) 27' El. to (+) 25' El.Beta Scan Measurements of Penetrations F8110113POOO1BS to F8110113POO80BS and F811O113PO133BS to F8110113P0135BS 0-4-Survey Unit F8110113 Distance in feet above 0 El.0 z "-~ 115fti.ID numbers of polar crane supports 0 LO)ID numbers of polar crane supports k ..105 ft.10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 1 2 3 4 5 6 7 8 9.-85ft.-75ft.-651ft.Personnel Halch -55 ft..- 35 ft.Equipment Hatch in U) (n U) Ui in I I I I .-...;ý ~ ~ ~ ~ .TrN--M.V .ýlosBS to1ll10S (equipment hatch (+) 0 El.(-I 27" El.I 251ft o 76BS, .~.~u) Y) E~n w n v n 0 0~ 08s..I~~ 18 at to 00 to M' 0) OD w I 79BS> -83BS5 5~ f t.I; I I I I I -~1i4BS'Tranfr i15.........

T ubes_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ -15 ft SinJ116) -U1 ., 0).. A 1 9h i n , !-) Un):n ..n.. (0 I I ...E ergency 111<a .) <I-00 ie M no cc Mn GO4< w. M: to a t a Hatchf, NOTE: Polar Crane supports are located every 10 d~grees and are numbered In red.It 00 Map F8110113-10, Reactor Containment Interior Walls Beta Scan Measurements of Horizontal Surfaces F8110113MO06IBS to F8110113M0079BS, F8110113MO081BS to F8110113M0084BS, F8110113M0086BS to F8110113MO11OBS, and F8110113MO114BS to F8110113MO115BS

`=-7F.4 0 Survey Unit F8110113 Distance in feet 0 above 0' El.Distance in ft.above (-) 27' El.0 ID numbers of polar ID numbers of polar crane sup orts crane supports -115.. +( ft.10 11 12 13 14 15 16 17 18 19 ý20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 1 2 3 4 5 6 7 8 9-85ft.-75ft.92 ft. I 65 1.Personnel Hatch 82 ft. -,'s 55ft.72 ftf .- 45 ft.2 62ft -35ft.Eqhijmnt7 Transfer Emergency 52ff Hatch Tubes Hatch 6 v U) (A) 0) 0ll ) Co w n q4- -t o n 2 t 42~2 ft=M.32ff 'r_ ( Q) GO 14 V) N U) f4 Uco U U U0 .. UN -, 3 ]2-. +.o1 = X I +] + o

  • f1] 1 3 -, I -501V 0 El e6) '0 L U) N ) (n V w- U) C- U) 0 U 021 [2 -, ,- ..ft, -(-) 27 El. " --25 .NOTE: Polar Crane supports are everyll) degrees and are numbered in red.Beta scan+ area of approximately 2 m by 2 rn Map F8110113-11, Reactor Containment fnterior Wafts'+/-J Beta Scan Measurements 002 F 6 F81011 3M01 52BS to F81 1011l3M0220BS 5-15 ft.l1M-0q 00 Map F8110113-12, Containment Interior Walls ()27' El. to ()25' El.Beta Scan Measurements of Liner Perforations F8110113CO116BS to F811O113CO126BS and X8110113M03308S to X8110113M0331BS

-0 coo Map F8110113-13, Containment Interior Walls (-) 27' El. to (+) 25' El.Beta Scan Measurements X8110113MO221BS to X8110113MO260BS i

0 CD oh 00 Map F8110113-14, Containment Interior Walls (-) 27' El. to (+) 25' El.Beta Scan Measurements X8110113MO261BS to X8110113MO326BS aýti 00 Map F8110113-15, Containment Interior Walls (-) 27' El. to (+) 25' El.Beta Scan Measurements X8110113MO181BS, X8110113MO185BS and X8110113CO327BS to X8110113CO3298S Beta Direct Measurements X8110113M0802BD, X8110113MO108BD, X8110113PO642BD and X8110113MO200BD Attachment 2 Instrumentation February 16, 2009 Survey Unit F8110113 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; 142509 44-116; 1939921 343 884 M2350; 189089 44-116; 192946' 343 884 M2350; 149789 43-68B; 161415' 257 612 M2350; 149789 43-68B; 1614152 433 1,033 M2350; 142509 43-68B; 160696' 257 612 M2350; 149789 43-68B; 148633' 257 612 M2350; 149789 43-51B; 1901673 586 1,370 M2350; 149789 43-51B;. 190167 2 1,324 4,494 M2350; 149789 43-51B; 190167' 788 2,675 M2350; 142509 43-51B; 190667' 788 2,675 M2350; -149789 43-116-1B; 256006 3 290 436 M2350; 149789 43-116-1B; 2560061 472 1,930 4.93 dpm a,N/Tennelec; 0401171 N/A 8.21 dpm N/A'Metal Surfaces 2 Concrete Surfaces 3 Metal Junctures Page 2 of 3 Att. 2 Instrumentation F8110113 Table 2-2. Investigation Criteria and DCGL Value Parameter (dPm/100 cm 2)Investigation Criteria -Direct 640,700 Investigation Criteria -Beta 43,000 Scan Investigatio n Criteria -Gamma .34,000 Cs-137 Scan (ISOCS average activity -11,000 Co-60 19.6 sq. meter field of view)Investigation Criteria -Gamma .....Scan (ISOCS average activity-19,000 Cso-60 12.6 sq. meter field of view)DCGLw 43,000 D2CGLEMC 640,700 Page 3 of 3 Att. 2 Instrumentation F8110113 Attachment 3 Investigation February 16, 2009 Survey Unit F8110113 Table 3-1 Survey Unit Investigation u Investigation Elevated Investigation DCGLemc Grid Levni tiat Result Area DCGLemc Result Unity d Level (cpm) (cpm) (dpm/lOOcm

2) Fraction 70 1,861 3,954 4,803 0.077 169.6 7,291,255 78,480 0.011 71 1,861 4,654 7,058 0.074 178.4 7,671,205 115,327 0.015 102 1,861 (not logged) 1,006 (scan) 23,250 N/A 103 1,861 2,147 1,589 0.009 1,432.6 61,600,459 25,964 N/A 108 9,880 24,985 54 0.019 670.8 28,843,635 1,361 N/A 1521 9,880 32,391 2,499 (scan) N/A N/A N/A 10,873 N/A 1762 9,880 249,608 1, 109 (scan) N/A N/A N/A 6,435 N/A 181 9,880 21,252 3,557 (scan) N/A N/A N/A 15,477 N/A 185 9,880 9,751 2,677 (scan) N/A N/A N/A 11,648 N/A 200 9,880 10,699 13,076 0.046 281.2 12,092,295 40,224 N/A 2023 9,880 27,140 Refer to Note 3 for additional explanation)

N/A P031 Exterior 1,100 1,835 891 0.008 1,671.0 71,852,951 22,449 N/A 1033 Exterior 1,100 4,829 1,004 0.014 958.0 41,195,710 N/A P034 Exterior 1,100 12,761 109 N/A N/A N/A 2,746 N/A P035 Exterior 1,100 4,618 2,537 0.035 373.9 16,078,331 63,920 0.004 P036 Exterior 1,100 1,394 962 0.019 670.8 28,843,635 24,238 N/A P041 Interior 1,100 1,442 1,784 0.009 1,432.6 61,600,459 44,948 0.001 (surveyed as P041 Exterior 1,100 3,350 290) N/A N/A N/A N/A N/A P042 Exterior 1,100 1,500 1,233 0.009 1,432.6 61,600,459 31,066 N/A (surveyed as P044 Exterior 1,100 1,649 271) N/A N/A N/A N/A N/A P047 Interior 1,100 1,531 58 N/A N/A N/A 1,461 N/A Page 2 of 4 Att. 3 Investigation F8110113 Investigation Initial Value Investigation Elevated Area Investigation DCGLemc Grid Leel(cmResult Area (m2) Factor DCGLemc Result Unity Level (cpm) (cpm) (cpm) (dpm/l00cm

2) Fraction P047 Exterior 1,100 2,575 2,289 0.005 2,309.2 99,294,293 57,672 0.001 P052 Exterior 1,100 14,047 14,105 0.008 1,671.0 71,852,951 355,379 0.005 P053 Exterior 1,100 9,197 9,748 0.032 403.5 17,351,697 245,603 0.014 P054 Exterior 1,100 3,542 2,348 0.012 1,116.5 48,009,355 59,158 0.001 (surveyed as P063 Exterior 1,100 5,102 296) N/A N/A N/A N/A N/A P064 Exterior 1,100 3,065 3,019 0.054 241.4 10,380,264 76,064 0.007 P080 Exterior 1,100 1,665 1,110 0.039 336.9 14,485,228 27,967 N/A 271 1,100 1,317 1,171 0.018 718.7 30,902,519 29,504 N/A 274 9,880 11,446 9,993 0.098 134.2 5,769,409 30,740 N/A 277 9,880 13,148 10,904 0.065 203.1 8,734,115 33,543 N/A (surveyed as 279 1,100 6,783 P052 Ext) N/A N/A N/A N/A N/A 279 9,880 13,275 11,218 0.126 104.7 4,500,134 34,508 N/A 285 9,880 11,361 1,404 0.018 718.7 30,902,519.

35,081 N/A 286 9,880 16,314 12,406 0.028 458.0 19,693,511 38,163 N/A 287 9,880 20,114 20,918 0.054 241.4 10,380,264 64,347 0.006 289 9,880 13,060 12,607 0.054 241.4 10,380,264 38,781 N/A 290 9,880 11,965 10,118 0.023 559.1 24,039,191 31,125 N/A 291 1,100 1,410 2,052 0.010 1,337.2 57,498,866 51,701 0.001 294 9,880 16,961 15,499 0.085 154.3 6,634,517 47,677 0.007 296 9,880 10,099 2,983 0.017 745.3 32,046,305 75,157 0.002 299 9,880 11,118 8,877 0.032 403.5 17,351,697 27,307 N/A 300 1,100 1,533 1,209 0.005 2,309.2 99,294,293 30,461 N/A 326 9,880 13,998 11,742 0.026 503.3 21,642,934 36,120 N/A Page 3 of 4 Att. 3 Investigation F8110113 Investigation Investigation DCGLemc Grid Investigation Initial Value Resut Elevated Area DCGLmc Result Unity Level (cpm) (cpm) (cpm) Area (dpm/lOOcm

2) Fraction Survey Unit Remainder DCGL = SU Mean =43,000 2,004 0.047 EMC Unity Sum 0.122'Grid 152 (2 m by 2 m area) was initially greater than the DCGLEMc. Investigation of the area resulted in the decision to perform additional remediation.

The area was resurveyed as grids 330 and 331. Beta scan activity for these grids ranged from 5,961 to 15,785 dpm/100 cm 2 , based on a surveyor efficiency of 0.5 and no background subtracted.

The reported investigation result is based on the average count rate of the two grids and represents the residual radioactivity levels following additional remediation.

2 Grid 176 (2 m by 2 m area) was initially greater than the DCGLEMC. Investigation of the area resulted in the decision to perform additional remediation.

The area was resurveyed as grids 221 to 260. Beta scan activity for these grids ranged from 2,460 to 14,913 dpm/100 cm 2 , based on a surveyor efficiency of 0.5 and no background subtracted.

The reported investigation result is based on the average count rate of the 40 grids and represents the residual radioactivity levels following additional remediation.

3Grids 198, 199 and 202 (adjacent 2 m by 2 m areas) were initially greater than the DCGLEMc. Measurements for 198 and 199 were not logged.Investigation of the area resulted in the decision to perform additional remediation.

These grids were resurveyed as 261 to 326. Beta scan activity-for- these grids ranged from. 3,159-to.-24-1,725-dpm/100 cm- , based. on a surveyor efficiency-of-0.5 and no-backgroundsubtracted. .Grids exceeding 2 43,000 dpm/100 cm are further annotated in the above table. The investigation results for these grids represent the-residual radioactivity levels following the remediation.

Page 4 of.4 Att. 3 Investigation F8110113 Attachment 4 Data Assessment February 16, 2009 Survey Unit F81101'13 tI'0 (tD r17 00 F8110113 Gross Activity Sample Results Quantile Plot DCGL = 43000 dpm/1 00cm 2 14,000 -12,000 -I 4-10,000 -8,000 -6,000 -.4.,00Q -2,000 0 1317 0 20 40 60 80 100 Percentile

  • Direct Measurements (dpm//100cm2)

-median --75th Percentile

-- --50th Percentile CD C'D tj 0 A A 0'02 Ci2 F8110113 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpm1O00cm=

C4 E'aO a.Au E 14000 12000 10000 8000 8000 4000 2000 0-2000-4000-8000 0.--0 Ofte --"-------0 0 0 00 00° O o 0 0 0 0 0-0 m m m m m m .Glb 00 ~0 *%Alp~' 00V p?@ 0 GI* -a a ----------- --a- ----- a.7279 2004-3270 t Measurement Locations o Gross Activity -Average --"+3StDev" --"-3StDev".

4->D Cn-D 0 02, F811011 3 Gross Activity Frequency Plot DCGL = 43000 dprn/1 00cm 2.2 110 105 100 95 90 85 80 75 70 65 60 55 50 45 40 35 30 25 20 15 10 5 0 00 C)I-V Bins -Upper End Value (dpm/1 00cm2).. .............

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