ML090930074

Final Status Survey Summary Report for December 10, 2008, Containment Interior Walls, (+) 25' El. to (+) 75' El, Survey Unit F8110112

ML090930074
Person / Time
Site:	Rancho Seco
Issue date:	12/10/2008
From:	Donna Anderson Sacramento Municipal Utility District (SMUD)
To:	NRC/FSME
Shared Package
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
References
DPG 09-097
Download: ML090930074 (32)

Text

Rancho Seco Final Status Survey Summary Report December 10, 2008 Containment Interior Walls, (+) 25' El. to (+) 75' El.

Survey Unit F8110112 Prepared By: ,1- to.---

0, Date: 1,/,/oc FSS Engineer Reviewed By:'C kLý , )I Date: \7-t /o*

Lead FSS Engineer Approved By: Date:_______

Dismantlement perintendent, Radiological

FINAL STATUS SURVEY

SUMMARY

REPORT Survey Unit:

F8110112, Containment Interior Walls, (+) 25' El. to (+) 75' 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 dpm/100 cm 2. 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/1 00 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 locationsare depicted on the maps in Attachment 1. Direct measurement locations were determined using a fixed grid pattern and 1,966 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 P oFSSSummary Report F8110112

Table 1. Survey Unit Design Parameters Survey Design Value Comment Parameter Survey Area: F811 Containment Interior Walls,

(+) 25' El. to (+) 75'*Et.

Survey Unit: 0112 Structure Surface Class: 1 LTP Table 5-4 SU Area (m2): 1,966 Evaluator: D. Anderson DCGL (dpm/100 cmr): 43,000 Gross Activity DCGL Area Factor: 14.9 Class 1 Design DCGLemc 640,700 'Class 1 (dpm/100 cm 2):

LBGR (dpmi/100 cm 2): 21,500 Default = 50% DCGL Design Sigma (dpm/100 cm 2): 33,040 Type I Error: 0.05 Type II Error: 0.05 Predominant Nuclide: Cs-137 Sample Area (m2): 19.6 Class 1 Scan Area (m2 ): 1,966 Scan Coverage (%): 100% Class 1 1.645 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: 180 Class 1 Grid Spacing L: N/A Class 1 Page 3 of 12 FSS Summary Report F8110112

Survey Results:

A total of 180 direct measurements were made in F8110112. 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 959 to 208,743 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.

Table 2. Direct Measurement Results Measurement ID Gross Activi Uncertainty (dpm/100 cm (dpm/100 cm 2 )

F8110112-MOOOIGS 5,902 1,014 F8110112-MOO02GS 2,760 607 F8110112-MOO03GS 1,616 453 F8110112-MOO04GS 1,571 465 F8110112-MOOO5GS 2,212 538 F8110112-MOO06GS 3,821 754 F8110112-MOO07GS 3,306 694 F8110112-MOO08GS 3,844 757 F8110112-MOO09GS 4,553 845 F8110112-MOOIOGS 9,289 1,432 F8110112-MOOIIGS 10,529 1,586 F8110112-MOO12GS 10,214 1,543 F8110112-MOO13GS 3,520 712 F8110112-MOO14GS 5,540 967 F8110112-MOOl5GS 8,385 1,318 F8110112-MOO16GS 2,592 585 F8110112-MOO17GS 1,881 492 F8110112-MOO18GS 4,335 817 F8110112-MOO19GS 4,497 834 F8110112-MOO20GS 4,628 849 F8110112-M0O21GS 5,522 955 F8110112-MOO22GS 11,959 1,760 F8110112-MOO23GS 14,472 2,058 F8110112-MOO24GS 7,556 1,217 F8110112-MOO25GS 8,340 1,318 F8110112-MOO26GS 4,676 853 F8110112-MOO27GS 9,922 1,506 F8110112-MOO28GS 7,008 1,155 F8110112-MOO29GS 3,838 754 F8110112-MOO30GS 1,696 487 F8110112-MOO31GS 1,143 383 F8110112-MOO32GS 1,440 .424 F8110112-MOO33GS 1,257 396 F8110112-MOO34GS 1,042 355 F8110112-MOO35GS 1,310 411 Page 4 of 12 FSS Summary Report F8110112

Measurement ID Gross Activity Uncertainty (dpm/100 cm ) (dpm/100 cm 2)

F8110112-MOO36GS 3,155 660 F8110112-MOO37GS 5,134 914 F81 10112-MOO38GS 2,474 578 F8110112 7 M0039GS 813 347 F8110112-MOO40GS 1,179 384 F8110112-MOO41GS 1,719 479 F8110112-MOO42GS 1,719 471 F8110112-MOO43GS 1,652 463 F8110112-MOO44GS 2,537 586 F8110112-MOO45GS 3,855 760 F8110112-MOO46GS 9,113 1,410 F8110112-MOO47GS 6,039 1,031 F8110112-MOO48GS 5,558 978 F8110112-MOO49GS 4,068 779 F8110112-MOO50GS 4,659 858 F8110112-MOO51GS 5,109 912 F8110112-MOO52GS 2,299 553 F8110112-MOO53GS 1,794 480 F8110112-MOO54GS 3,623 720 F8110112-MOO55GS 3,874 759 F8110112-MOO56GS 4,896 895 F8110112-MOO57GS 3,123 667 F8110112-MOO58GS 6,117 1,041 F8110112-MOO59GS 5,625 975 F8110112-MOO60GS 3,349 6,663 F8110112-MOO61GS 4,203 802 F8110112-MOO62GS 3,218 666 F8110112-MOO63GS 6,294 1,056 F8110112-MOO64GS 4,821 878 F8110112-MOO65GS 2,389 559 F8110112-MOO66GS 2,362 570 F8110112-MOO67GS 2,558 587 F8110112-MOO68GS 1,620 465 F8110112-MOO69GS 1,264 436 F8110112-M0070GS 1,444 446 F8110112-MOO71GS 1,935 519 F8110112-MOO72GS 3,226 682 F8110112-MOO73GS 5,515 971 F8110112-MOO74GS 3,136 670 F8110112-MOO75GS < 777 F8110112-MOO76GS < 777 F8110112-MOO77GS < 759 F8110112-MOO78GS 735 338 F8110112-MOO79GS 817 322 F8110112-MO80GS 1,123 393 F8110112-MOO81GS 1,450 426 F8110112-MOO82GS 2,851 612 F8110112-MOO83GS 2,861 615 F8110112-MOO84GS 2,835 630 F8110112-MOO85GS 3,389 693 F8110112-MOO86GS 4,425 824 F8110112-MOO87GS 5,885 1,009 Page 5 of 12 FSS Summary Report F8110112

Measurement ID Gross Activit* Uncertainty (dpm/100 cm (dpm/100 cm 2)

F8110112-M0088GS 4,716 864 F8110112-M0089GS 1,629 477 F8110112-MOO90GS 4,493 834 F8110112-MOO91GS 3,630 722 F8110112-MOO92GS 2,995 650 F8110112-MOO93GS 2,414 576 F8110112-M0094GS 2,588 583 F8110112-M0095GS 2,501 581 F8110112-MOO96GS < 807 F81.10112-MOO97GS 1,382 414 F8110112-MOO98GS 2,535 571 F8110112-MOO99GS 3,019 648 F8110112-MO100GS 2,050 530 F8110112-MO101GS 1,371 416 F8110112-M012GS 900 349 F8110112-MOI03GS 1,000 383 F8110112-M0O104GS 576 323 F8110112-M0O105GS < 771 F8110112-MO106GS 1,417 435 F8110112-MO107GS 1,259 397 F8110112-MO108GS 3,327 691 F8110112-MO109GS 5,452 968 F8110112-MO110GS 2,961 649 F8110112-MO111GS 705 325 F8110112-MOI2GS < 771 F8110112-MOI3GS < 726 F8110112-M0114GS 488 297 F8110112-M0115GS 941 360 F8110112-MOI6GS < 901 F8110112-M0117GS 1,150 384 F8110112-M0118GS 3,217 671 F8110112-M0l19GS 2,250 542 F8110112-MO120GS 1,957 498 F8110112-MO121GS 3,272 685 F8110112-M0122GS 2,985 655 F8110112-MOI23GS 3,075 658 F8110112-MO124GS 2,786 610 F8110112-MOl25GS 1,282 416 F8110112-MO126GS 2,663 603 F8110112-MO127GS 2,180 530 F8110112-MOl 28GS 1,882 497 F8110112-MOI29GS .2,085 523 F8110112-MO130GS 4,057 782 F8110112-M0131GS 2,189 534 F8110112-MO132GS < 693 F8110112-MO133GS 1,948' 510 F8110112-MO134GS 2,174 522 F8110112-MO135GS 2,397 567 F8110112-MO136GS 1,848 492 F8110112-MO137GS 1,102 384 F8110112-MOl38GS 890 338 F8110112-MO139GS 999 362 Page 6 of 12 FSS Summary Report F8110112

Measurement ID Gross Activi Uncertainty (dpm/100 cm (dpm/100 cm 2)

F8110112-MO140GS 783 306 F8110112-MO141GS 1,246 409 F8110112-MO142GS 1,748 481 F8110112-MO143GS 1,551 446 F8110112-MO144GS 2,527 591 F8110112-MO145GS 3,598 729 F8110112-MO146GS 2,897 640 F8110112-MO147GS < 801 F8110112-MO148GS < 627 F8110112-MO149GS 389 255 F8110112-MO150GS < 771 F8110112-MOI 51 GS < 765 F8110112-MOl 52GS 801 315 F8110112-MO153GS < 807 F8110112-MO154GS 1,882 485 F8110112-MO155GS 1,856 488 F8110112-MO156GS 1,136 385 F8110112-MO157GS 1,781 487 F8110112-MOl 58GS 1,679 455 F8110112-MOl 59GS 1,344 428 F8110112-MOl 60GS < 765 F8110112-MOI 61 GS 1,305 404 F8110112-MO162GS 2,754 608 F8110112-MO163GS 2,398 565 F8110112-MO164GS 1,378 414 F8110112-MO165GS 1,941 496 F8110112-MOl66GS 4,386 .821 F8110112-MOl 67GS 3,043 645 F8110112-MO168GS 401 259 F8110112-MO169GS 1,371 420 F8110112-MO170GS 1,861 488 F8110112-MO171GS 3,364 684 F8110112-MO172GS 2,038 513 F8110112-MO173GS 1,054 369 F8110112-MO174GS < 672 F8110112-MO175GS 1,013 359 F8110112-MO176GS 337 230 F8110112-MO177GS 683 308 F8110112-MO178GS 1,096 369 F8110112-MO179GS 713 330 F8110112-MOl 80GS 2,133 543 Mean: 2,852 Median: 2,201 Standard Deviation: 2,329 Range: 337 -14,472 Page 7 of 12 FSS Summary Report F8110112

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

F8110112MOO01SM 627.35 F8110112MOO02SM 233.46 F8110112MOO03SM 24.24 F8110112MOO04SM 93.98 F8110112MOO05SM 7.46 F8110112M0006SM 29.41 F8110112M0007SM 4.87 F8110112M0008SM 10.04 F8110112MOO09SM 12.62 F8110112M0010SM 16.5 F8110112M0011SM 47.49 F8110112M0012SM 30.7 F8110112MOO13SM 16.5 F8110112M0014SM 22.95 F8110112MOO15SM 21.66 F8110112MOO16SM 43.62 F8110112M0017SM 72.03 F8110112MOO18SM 15.2 F8110112MOO19SM 62.99 F8110112MOO20SM 157.26 F8110112M0021 SM 93.98 F8110112M0022SM 20.37 F8110112M0023SM 161.14 F8110112MOO24SM 24.24 F8110112M0025SM 277.37 F8110112M0026SM 31.99 F8110112M0027SM 126.27 F8110112MOO28SM 96.57 F8110112M0029SM 203.76 F8110112MOO30SM 118.52 F8110112MOO31SM 113.35 F8110112MOO32SM 43.62 F8110112M0033SM 223.13 F8110112MOO34SM 16.5 F8110112MOO35SM 149.52 F8110112MOO36SM 73.32 F8110112M0037SM 188.26 F8110112MOO38SM 78.49 F8110112M0039SM 1315.69 F8110112MOO40SM 55.24 F8110112M0041SM 34.58 F8110112MOO42SM 65.57 F8110112MOO43SM 33.28 F8110112M0044SM 30.7 F8110112M0045SM 34.58 F8110112MOO46SM 57.82 F8110112M0047SM 22.95 F8110112M0048SM A 31.99 Page 8 of 12 FSS Summary Report F8110112

Measurement ID Surface Beta Activity (dpm/100 cm 2 )

F8110112M0049SM 38.45 F8110112MOO5OSM 20.37 F8110112MOO51SM 39.74 F8110112M0052SM 6.16 F8110112M0053SM 145.64 F8110112M0054SM 31.99 F8110112M0055SM 236.04 F8110112MOO56SM 224.42 F8110112M0057SM 34.58 F8110112MOO58SM 12.62.

F8110112M0059SM 47.49 F8110112MOO60SM 20.37 F8110112MOO61SM 131.43 F8110112MOO62SM 22.95 F8110112M0063SM 22.95 F8110112M0064SM 25.54 F8110112M0065SM 8.75 F8110112M0066SM 28.12 F8110112M0067SM 38.45 F8110112M0068SM 60.41 F8110112M0069SM 29.41 F8110112MOO70SM 16.5 F8110112M0071 SM 90.11 F8110112M0072SM 103.02 Mean: 93.18 Median: 38.45 Standard Deviation: 173.27 Range: 4.87 to 1315.69 Page 9 of 12 FSS Summary Report F8110112

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 F8110112

Table 4. Data Assessment Results Survey Results Parameter Value Comment Material Background Used (dpm/loo 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): 2,201 Mean (dpm/100 cm 2): 2,852 Direct Measurement Standard Deviation 2,329 (dpm/100 cm 2):

Total Standard Deviation (dpm/100 cm 2): 2,329 Based on samples and backgrounds.

Maximum (dpin/100 cm 2): 14,472 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 F8110112

Survey Unit Investigations. and Results:

Forty-two investigations (scan grids 33-36, 39, 43-45, 47, 53-56, 58-60, 79, 85-86, 92, 94, 97-99, 102-104, 137-143, 147, 160, 208, 233, 238, 243, 247, and P087) 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-two 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. 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 F8110112 meets the release criteria of 10CFR20.1402.

Page 12 of 12 FSS Summary Report F8110112

Attachment 1 Maps December 10, 2008 Survey Unit F8110112

'-LII 0

,. Ci. I-i.i-I : :' -+'+ . . . . . . ,-

Loato ofZCotanmn Buldn Ma F8111 Cona, i ,,

1. ,r-inside the Industrial Area I .a- F10121 Cotimn Building t a caton Loaio of ContaimneBdn Location at Rancho Seco site

W5 j Distance Survey Unit F8110112 Distance in feet above -27 El. above 0'El.

t 0 z Wx ID numbers of polar ID numbers of polar Y crane supports- _crane suppor.ts .. ...... 115 ft.

105 11.

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

- 9it.

+85 ft.

Personnel

- 75 f.

92 ft. - 28.04 r ... 65 ft.

82 f1. 24.99r 551f.

72 ftt 21.95 45 ft.

i62 ft,- 8l&90 - 35ft.

52 ft. 15.85r 25ft.

- f5t.

"+5 fIL

-5ft.

. . 0.0 . 0.

1, .o o....

o. ,6 oOe

.. o. 0 ...15 ft.

(-) 27' El. -25 ft Equipment Transfer Emergency Hatch Tubes Hatch 3.46 meters between horizontal 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.

Total Scan Area is approximately 1,966 square meters (100%). Map F8110112-2, Reactor Containment Interior Walls

',J ISOCS Gamma Scan Measurements 00 0 2 a6 n F8110112MOO01GS to F8110112MO180GS

'sr- c Kr Mrer 19.6 sq. meter field of view

(Er 0 Distance Survey Unit F8110112 Distance in feet above -27' El. above 0 El.

0 0

'u U) z 115 ft.

-105 ft.

95ft.

851a.

t .. 4.. !. .. \ i. 75 ft.

k ~Personnel / 65ft.

82 ft. - 24.99 ry 19 21 23 25 27 29 31 33 P7 39 41 43 45 47.49

.5 3 55 57 59 61 63. 65 67 69 71 1 7 9 11 13 15 17 55 ft.

ID numbers of polar ID numbers of polar 45ft.

crane supports- crane supports 62 ft. - 1890 ir 20 22 .24_ 26 28. .30 .32_-34._36-3& 40 42 .4 .46. .48.50 2 4 56 .58 .60..62"'-64 66, 68 70. 72. 2... 4 . 6 8 10..12 14 16 18 35ft.

Equipment ....

25ft.

Hatch

.. Transfer .. Emergency 15ft.

C/) Tubes . Hatch

(,) O'El. f .5 ft.

.e 0a~ ... o. 0000 -15 ft.

--25 ft.

(-) 27' El.

NOTE: Polar Crane supports are located every 10 degrees, are numbered in red.

r-TI 00 Map F8110112-3, Reactor Containment Interior Walls Smear Measurements 9 2 4 6 $

eC .ra.,MnS F8110112M01SM to F8110112M0072SM I'.)

Map F8110112-4, Containment Interior Walls (4-) 25' El. to (+) 75' El., Personnel Hatch Beta Scan Measurements F8110112M0001BS to F8110112MOO32BS and F8110112MOO72BS to F8110112MOO84BS Page 5 of 11 Att. 1 Maps F8110112

(D 0

00 C)

Map F8110112-5, Containment Interior Walls (-) 27' El. to (+) 75' El.

Beta Scan Measurements F8110112M0033BS to F8110112MO071BS and F* l1nh11 Mnng'Pgq tA PR11flh19Mnn*RR~P F811nj12MOO85B-0 to F8110112KAno866S

00

~~51 t-tw Map Fg110112-6, Containment Interior Walls (-) 27' El. to (+) 75' El.

Beta Scan Measurements F8110112MO0gTBS to Fg110112MOO88BS

0D 00 0

Survey Unit F8110112 Distance in feet above 0 El.

0I 0 ID numbers of polar ID numbers of polar crane supports crane supports

............................... 1.5 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

.. ' . .. . . 9 5 ft.

- . A. . .. . .. .. .. . .. I .

85-l I ] ~II II1 I I I 'iI1 1 I I I I I I --+--I I I I II I I I I I I 1 85ft.

a-Tn) V) a) Emergency - 5ft.

I I  ! I!-t A- --P- 0t 0I "N --- 1 Rt -I- N M-I a.I ----- 0I t 0 IN 9 I Ni HI Q) ) Qo C)

( it v) v o Co (n (n a)~ ersnnejI-latg o, e, e,) v ) c) a) co e, u) oC) wl &n) no y,) o, 55)ft.

m m M M co M to co M M to ca M -5M CC a ~e --- IV 'n - 45ft.

to-- o -. aU)*n E 0+ CC C N -.- C.) C° CN °- * .-

"N°N - 0 . --

,weC C 0 CD "C C IC 0) v) 0 35 ft.

5C' Eq)i-N

-- - ~

-Hatch N N N C 25 ft.

OTE-Transfer P Emergency -155.

e eTubues ..... ...-. - Hatch 00 16 5 ft.

OOEl NOTE Polar Scan Measutsrremtcnts Map, F8110112-7 0-92B tor F8o1t2men 1 o W 00 5 2 5 5F8110112MO092BS to F8110112MO1708S MoSOl t'

0rc Survey Unit F8110112 Distance in feel above 0 El.

Distance in ft.

above (-)27' El.

0 z0 w 0 ID numbers of polar ID numbers of polar V

~raqne suonnorts crane supports

- 115 It.

-105 ft.

10 11 21 5 1 7 1 9 2 1 23" 24 25 26 27 28 29:30 31 32 33 34 35 36 1 2 3 4 5 6 7 8 91

- 9511.

i - 85ft.

Personnel Hatch -- 75ft.

0U 0 i #) V) V , Al ri) U) (0 0 0 0 i)0 )

(I (1) 65 ft.

. 1N .. , O> MI- I-1 41 8211 N N IN 0 N

,--ly6 N In N,,. Al 0, 9 IIf N .....

l.U 0, Na Ci W] ,, [I," TA 55 ft.

7211 I- [ i ' * , 11 .NAO N --- N, m N -45kt 5ft w atj f1j k4ml In 351.

521 [i] [0] ,=  : ,> o > N IN I*l0

• Transfer "(. . @ ..

Emergency. i 25 ft.

STubes

~ .~ N Ni Hatch

- 15ft.

-5ft.

1+) 'El.

.. quip2E_ - -5ft.

Hatch

-- 15 ft.

-)27"El.

ii

-- 25 ft.

NOTE: Polar Crane supports are located every 10 degrees and are numbered in red.

M- Beta scan area of approximately 2 m by 2 m Map F8110112-8, Reactor Containment Interior Walls It 00 Beta Scan Measurements 0 2

• 6 e F8110112M0183BS to F8110112M0271BS e-.Moe-s D.I-OCO C)

Personnet Hatch (D

P%26 44444Q q 0 0 0 0 0 0 0 0 I# P116 Penetrations to be 0

Q o4 0 0 0 0 0 0 0 0 surveyed under FSS 0 0 Package F8110112 0 00000 0 0 0 0 0 0 0 P115 0 0 0 0 0 O 00 I 0, 0 0, 0 4 20' EIev. 00 0 00 0 00 GO0

, 4, ££ N 0 0 0 0 0 0 0 0 0 0 0 Penetrations to be surveyed under FSS O 0 0 0 0 0 0 0 0 0 0 Package F8110113 0 0 0 0 0' Elev. P63 P62 , P61 P60

" 4? P, o' * ' *° Penetrations to be 0 0 o o o o a 0 0 oq 0'* 't 'z 0 0 0o*o* 0 0 0 0oE) surveyed under FSS o 0 0 ,Oo 0 0oOQo 0 0020 0 PackageF8110113 "0000000000

,P e 3'" ,'- e , zO 4

-27' Etev.

I-T 00

" = Penetration CLOSED from Rx Side Rx Bldg. Inside View Penetrations

= Penetration OPEN from Rx Side *SMUI MEASUREMENT LOCATIONS SACRAMENTO MUNICIPAL UTILITY DISTRICT Map F8110112-9 FILE: J Gdihloy.

(DO I

00 IQ Map F8110112-10, Containment Interior Walls (+) 25' El. to (+) 75? El.

Beta Scan Measurements of Penetrations F8110112PO81BS to F8110112P127BS

Attachment 2 Instrumentation December 10, 2008 Survey Unit F8110112

Table 2-1. Survey Unit Instrumentation Instrument Detector MDC Static MDC Scan Model; Serial No. Model; Serial No. (dpm/lO0 cm 2) (dpm/lO0 cm 2 )

M2350; 149789 43-68B; 161415 257 612 M2350; 142509 43-68B; 160699 257 612 M2350; 149789 43-68B; 148633 257 612 M2350; 149789 43-51B; 190167 788 2,675 M2350; 149789 43-116-IB; 256006 290 436 Tennelec; 0401171 N/A 4.93 dpmaa, N/A 8.21 dpmr _

Instrument Detector Detector MDC Model No. Serial No.

Metal - 901 dpm/100 cm 22Cs-137, ISOCS N/A 1983920 Metal -621 dpm/100 cm Co-60 Table 2-2. Investigation Criteria and DCGL Value Parameter dp (dpm/100luec2cm 2 )

Investigation Criteria - Direct 640,700 Investigation Criteria - Beta 43,000 Scan Investigation Criteria - Gamma 34,000 Cs-137 Scan (ISOCS average activity - 11,000 Co60 19.6 sq. meter field of view) 11,000_Co-60 DCGLw 43,000 DCGLEMC 640,700 Page 2 of 2 Att. 2 Instrumentation F8110112

Attachment 3 Investigation December 10, 2008 Survey Unit F8110112

Table 3-1 Survey Unit Investigation Investigation Investigation DCGLemc Grid Investigation Initial Value Result Elevated Area DCGLemc Result Unity Level (cpm) (cpm) (cpm) Area (m 2) Factor (dpm/lOOcm2) Fraction 33 1,100 1,329 346 (scan) (N/A) (N/A) (N/A) 1,505 (N/A) 34 1,100 1,808 3,345 (scan) (N/A) (N/A) (N/A) 14,554 (N/A) 35 1,100 4,646 8,239 (scan) (N/A) (N/A) (N/A) 35,848 (N/A) 36 1,100 3,078 2,346 (scan) (N/A) (N/A) (N/A) 10,207 (N/A) 39 1,100 2,436 1,634 (scan) (N/A) (N/A) (N/A) 7,110 (N/A) 43 1,100 1,222 2,856 (scan) (N/A) (N/A) (N/A) 12,426 (N/A) 44 1,100 1,936 3,423 (scan) (N/A) (N/A) (N/A) 14,894 (N/A) 45 1,100 1,769 2,201 (scan) (N/A) (N/A) (N/A) 9,577 (N/A) 47 1,100 2,371 1,540 (scan) (N/A) (N/A) (N/A) 6,701 (N/A) 53 1,100 3,189 1,291 (scan) (N/A) (N/A) (N/A) 5,617 (N/A) 54 1,100 2,013 903 (scan) (N/A) (N/A) (N/A) 3,929 (N/A) 55 1,100 12,771 6,094 (scan) (N/A) (N/A) (N/A) 26,515 (N/A) 56 1,100 2,329 2,966 (scan) (N/A) (N/A) (N/A) 12,905 (N/A) 58 1,100 2,564 742 (scan) (N/A) N/A (N/A)_ 3,228 (N/A) 59 1,100 1,226 1,166 (scan) (N/A) (N/A) (N/A) 5,073 (N/A) 60 1,100 1,564 4,749 (scan) (N/A) (N/A) (N/A) 20,663 (N/A) 79 9,880 47,983 35,957 0.023 559.1 24,039,191 110,610 0.005 85 9,880 20,710 14,791 0.093 141.6 6,086,753 45,500 0.007 86 9,880 15,879 11,340 0.005 2,309.2 99,294,293 34,884 N/A 92 7,214 16,290 9,005 0.022 591.6 25,440,358 37,947 N/A 94 7,214 17,619 14,009 0.048 272.2 11,704,369 59,033 0.005 97 7,214 9,567 13,800 0.097 135.1 5,809,305 58,153 0.010 98 7,214 15,927 9,085 0.037 352.0 15,134,355 38,284 N/A Page 2 of 3 Att. 3 Investigation F8110112

Grd Investigation Initial Value Investigation Result Area (in 2) Factor Investigation DCGLemc Fato Investigation Elevated Area DCGLemc Result Unity Level (cpm) (cpm) (cpm) (dpm/1 00cm 2) Fraction 99 7,214 11,885 13,622 0.133 99.6 4,282,247 57,402 0.013 102 7,214 11,702 6,027 0.130 101.6 4,370,233 25,397 N/A 103 7,214 14,237 2,480 0.099 133.2 5,729,394 10,451 N/A 104 7,214 .10,090 4,643 0.016 788.7 33,914,181 19,565 N/A 137 7,214 9,649 9,100 0.082 159.6 6,863,178 38,347 N/A 138 7,214 14,459 8,708 0.166 80.3 3,450,978 36,695 N/A 139 7,214 19,450 15,823 0.148 89.7 3,855,933 66,677 0.017 140 7,214 20,094 14,733 0.129 102.7 4,415,614 62,084 0.014 141 7,214 11,574 10,551 0.111 118.7 5,106,180 44,461 0.009 142 7,214 11,197 8,143 0.073 180.5 7,760,334 34,314 N/A 143 7,214 8,733 5,315 0.107 123.2 5,297,813 22,397 N/A 147 7,214 8,589 6,988 0.032 412.5 17,738,929 29,447 N/A 160 7,214. 11,620 48,464 0.018 728.1 31,307,015 204,225 0.007 208 9,880 13,394 12,500 0.139 95.2 4,092,904 38,452 N/A 233 9,880 12,777 13,294 0.750 19.4 834,022 40,895 N/A 238 9,880 18,270 11,956 1.064 14.2 610,314 36,779 N/A 243 9,880 22,930 21,302 0.240 56.0 2,407,457 65,528 0.027 247 9,880 18,392 17,077 0.434 32.1 1,381,047 52,532 0.038 P087 Ext. 1,100 1,389 777 0.006 2,351.1 101,097,300 19,577 N/A DCGL = SU Mean =

Survey Unit Remainder 43,000 2,852 0.066 EMC Unity Sum 0.219 Grids 33 through 60 were initially greater than the DCGLEMC. Investigation of the areas resulted in the decision to perform additional remediation.

The investigation results for these grids represent the residual radioactivity levels following additional remediation.

Page 3 of 3 Att. 3 Investigation F8110112

Attachment 4 Data Assessment December 10, 2008 Survey Unit F8110112

(tD F8110112 Gross Activity Sample Results Quantile Plot 0 DCGL = 43000 dpm/1 00cm 2 16,000 -

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0 20 40 60 80 100 Percentile 00

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

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FBI 10112 Gross Activity Sample Results Scatter Plot DCGL = 43000 dpmti00cm=

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F811011 2 Gross Activity Frequency Plot 0

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