ML12025A127

Plum Brook Reactor Facility Final Status Survey Report Attachment 15, Revision 0, Miscellaneous Structures and Pads, Part 2 of 2

ML12025A127
Person / Time
Site:	Plum Brook
Issue date:	01/19/2012
From:	US National Aeronautics & Space Admin (NASA), John H. Glenn Research Ctr at Lewis Field
To:	NRC/FSME
References
Download: ML12025A127 (74)

Text

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix A, Rev. 0, Page 16 of 27 Exhibit 14, Miscellaneous Pads -V Hot Pipe Tunnel Roof- Survey Unit MA-5-3 Air Intake Structure for Reactor Building at NE Comer -Survey Unit MA-5-3 Plum Brook Reactor Facility FSSR, Attachment 15 Appendix A, Rev. 0, Page 17 of 27 Exhibit 15, Miscellaneous Pads -VI ment Pad East of Hot Lab -Hot Lab Building NE Manhole -Survey Unit MA-5-3 Plum Brook Reactor Facility FSSR, Attachment 15 Appendix A, Rev. 0, Page 18 of 27 Exhibit 16, Miscellaneous Pads -VII Hot Pipe Tunnel Access Cover -Survey Unit MA-5-4 Substation 4 Floor -Survey Unit MA-5-4 Plum Brook Reactor Facility FSSR, Attachment 15 Appendix A, Rev. 0, Page 19 of 27 Exhibit 17, Miscellaneous Pads -VIII Electrical Pit SE of Reactor Security Building -Survey Unit MA-5-5 Waste Handling Building Sidewalk -Survey Unit MA-5-5 Plum Brook Reactor Facility FSSR, Attachment 15 Appendix A, Rev. 0, Page 20 of 27 Exhibit 18, Miscellaneous Pads -IX Pad at West Door of Reactor Security Building -Survey Unit MA-5-5 Sidewalk SW of Reactor Security Building -Survey Unit 5-5 Plum Brook Reactor Facility FSSR, Attachment 15 Appendix A, Rev. 0, Page 21 of 27 Exhibit 19, Sludge Drying Basin Sluice Gates Basin No. 1 Discharge Gate -Survey Unit MA-5-6 Basin No. 1 Discharge Drainage Ditch -Survey Unit MA-5-6 Plum Brook Reactor Facility FSSR, Attachment 15 Appendix A, Rev. 0, Page 22 of 27 Exhibit 20, WEMS Outfall Wing Wall View of Wall Looking North to Pentolite Road -Survey Unit MA-5-6-I Plum Brook Reactor Facility FSSR, Attachment 15 Appendix A, Rev. 0, Page 23 of 27 Exhibit 21, Reactor Security Building -I Building Exterior Facing Northeast

-Survey Unit RS-1-1 Roof Facing South -Survey Unit RS-1-1 I Plum Brook Reactor Facility FSSR, Attachment 15 Appendix A, Rev. 0, Page 24 of 27 Exhibit 22, Reactor Security Building -II South Section Showing Walls and Ceiling -Survey Unit RS-I-1 Northwest Section Showing Walls, Floor and Ceiling -Survey Unit RS-I-1 Plum Brook Reactor Facility FSSR, Attachment 15 Appendix A, Rev. 0, Page 25 of 27 Exhibit 23, Unusual Condition Measurement Areas UCM on WEMS Flume Trench with Cracked Concrete and Embedded Anchors UCM on Cooling Tower Sump -Cracked Concrete and Corroded Steel Frame Plum Brook Reactor Facility FSSR, Attachment 15 Appendix A, Rev. 0, Page 26 of 27 Exhibit 24, Unusual Condition Measurement Areas -Continued Expansion Joint in East Sludge Basin Wall WEMS Floor -Pillar Joint, Eroded and Chipped Concrete Plum Brook Reactor Facility FSSR, Attachment 15 Appendix A, Rev. 0, Page 27 of 27 Exhibit 25, Surface Measurement Test Areas SMTA on WEMS Sumrn Floor with Rough. Gouaed Concrete STMA on West Sludge Basin South Wall -Eroded Rough Concrete Plum Brook Reactor Facility Final Status Survey Report Attachment 15 Miscellaneous Structures and Pads Appendix B Revision 0 Survey Unit Maps and Tables Showing Measurement Locations and Results Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 2 of 48 Index of Miscellaneous Structures and Pads Survey Unit Maps and Tables of Coordinates Survey Unit Description Page Number Number of Pages MA-I-1 ATS Tunnel -South Floor 5 1 MA- 1-2 ATS Tunnel -North Floor 6 1 MA-1-3 ATS Tunnel -East Wall -South End 7 1 MA-1-4 ATS Tunnel -West Wall -South End 8 1 MA-1-5 ATS Tunnel -Ceiling -South End 9 1 MA-1-6 ATS Tunnel -N & S Walls, E & W Walls North End, & 10 Ceiling North End MA-2-1 Cooling Tower Basin Sump -Floor 11 1 MA-2-2 Cooling Tower Basin Sump -Ceiling 12 1 MA-2-3 Cooling Tower Basin Sump -Ceiling 13 1 MA-2-4 Cooling Tower Basin Sump -Walls 14 1 MA-2-5 Cooling Tower Basin Sump- Floor and Walls 15 1 MA-2-6 Cooling Tower Basin- Floor Section #1 16 1 MA-2-7 Cooling Tower Basin- Floor Section #2 17 1 MA-2-8 Cooling Tower Basin- Floor Section #3 18 1 MA-2-9 Cooling Tower Basin- Floor Section #4 19 1 MA-2-10 Cooling Tower Basin- Floor Section #5 20 1 MA-2-11 Cooling Tower Basin- Floor Section #6 21 1 MA-2-12 Cooling Tower Sump -Walls 22 1 MA-2-13 Cooling Tower Sump -Walls and Roof 23 1 MA-2-14 Cooling Tower Sump -Walls and Roof 24 1 MA-2-15 Cooling Tower Basin Sump- Steel Pipes 25 1 MA-3-1 Water Effluent Monitoring Station (WEMS) Sump 26 1 Floor MA-3-2 WEMS- Sump Walls and Ledge 27 1 MA-3-3 WEMS-Pump Slab, Sides and Miscellaneous Sections 28 1 MA-3-4 WEMS-Walls 29 1 MA-3-5 WEMS- Flumes and Gates 30 1 MA-3-6 WEMS- Trash Screen Walls, Ceiling and Floor 31 1 MA-3-7 WEMS- Floor 32 1 MA-4-1 West Sludge Basin -Floor Section #1 33 1 MA-4-2 West Sludge Basin -Floor Section #2 34 1 MA-4-3 West Sludge Basin -N, W, & S Walls 35 1 MA-44 West Sludge Basin -E Wall, Short Wall, Valve Pit, 36 1 West Vavle Pit MA-4-5 East Sludge Basin -Floor Section #1 37 1 MA-4-6 East Sludge Basin -Floor Section #2 38 1 MA-4-7 East Sludge Basin -N, E & S Walls 39 1 MA-4-8 East Sludge Basin -W Wall, Short Wall, Valve Pit 40 1 MA-4-9 East & West Basins top ledge & exterior walls, & Sump 41 1 MA-5-1 Reactor Substation (1161) 42 1 MA-5-2 Pads & Foundations West of the Reactor Building 43 1 Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 3 of 48 Index of Miscellaneous Structures and Pads Survey Unit Maps and Tables of Coordinates Survey Unit Description Page Number Number of Pages Pads & Foundations East of the Hot Lab & Reactor MA-5-3 Bulig44 1 Building MA-5-4 Substation 4 & Equipment Ramp at East HL Bldg Roll- 45 1 up Door MA-5-5 RSCB Sidewalks

& Misc Pads 46 1 MA-5-6 WEMS Outfall Wing Wall & Drying Basin Sluice 47 1 Gates RS-1-1 Reactor Security Bldg -Interior and Exterior 48 1 1 surfaces I Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 4 of 48 Appendix B Note: 1. Occasionally negative values of individual measurements appear in the tables in this appendix.

In accordance with PBRF FSS/Characterization procedures, each measurement result in dpm/100-cm 2 is obtained by taking a shielded measurement and an unshielded measurement at each location established in the survey design. The shield is of sufficient thickness to completely attenuate (absorb)the most energetic beta from PBRF residual surface contamination (Sr/Y-90).

The net activity is then determined as: Net activity in dpm/1 00-cm 2 = (Unshielded cpm -Shielded cpm): Where: E, (A/100)Unshielded cpm is the detector response including contributions from radiation entering the detector sensitive face (open area) and from ambient radiation (mostly gammas) entering the detector from all directions.

Shielded cpm is the detector response with the shield in place between the detector sensitive face and the surface being investigated.

The shield eliminates beta particles from the surface under investigation and the detector response is due only to ambient radiation that enters the detector (from all directions).(Unshielded cpm -Shielded cpm) is the net cpm due to activity, mostly beta particles entering the detector from the surface under investigation.

Note that the net cpm includes contributions from residual contamination that may be present and from naturally occurring beta emitters in the material.

This natural background component is considered to be small and is neglected, i. e., this background contribution is not subtracted in determining net cpm.Detector efficiency, E,, dpm/cpm for the detector, is the product of the detector efficiency and the surface efficiency.

A typical value of E, for the Ludlum 44-116 detector, the detector of choice for FSS systematic measurements in structures, is approximately 15% (0.15).A/l100 is the factor to convert dpm per detector area to dpm/ 100-cm 2 , where A is the detector open area in cm 2.The open area of the Ludlum 44-116 is 100 cm 2 , so the (A/100) factor is unity in this case.Negative values of net activity occur when the measured shielded cpm is greater than the measured unshielded cpm at a location.

This most often occurs in survey units where residual contamination levels are low, near background, and the ambient background is also low. Thus, the random variability of low level count rates will result in occasional measurement pairs where the recorded shielded count rate exceeds the unshielded count rate.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 5 of 48 Survey Unit MA-I-1 ATS Tunnel -South Portion of the ATS Tunnel floor 191 19a 'gal VB 'Eal 'gal Measure from this point MA-I-1 AREA: South Portion of the ATS Tunnel floor Measurement Locations and results Location /X Co-ord im Y Co-ord (m) dpmll 00-cm 2 Type Notes 2.7 0.2 SM-1 371 Systematic N/A 5.7 0.2 SM-2 629 Systematic N/A 8.8 0.2 SM-3 1021 Systematic N/A 11.8 0.2 SM-4 1035 Systematic N/A 14.9 0.2 SM-5 811 Systematic N/A 17.9 0.2 SM-6 944 Systematic N/A 20.9 0.2 SM-7 825 Systematic N/A 24.0 0.2 SM-8 972 Systematic N/A 1.2 2.9 SM-9 951 Systematic N/A 4.2 2.9 SM-10 1126 Systematic N/A 7.3 2.9 SM-11 615 Systematic N/A 10.3 2.9 SM-12 650 Systematic N/A 13.3 2.9 SM-13 986 Systematic N/A 16.4 2.9 SM-14 811 Systematic N/A 19.4 2.9 SM-15 727 Systematic N/A 22.5 2.9 SM-16 636 Systematic N/A All sample points are measured from the point shown on the map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 6 of 48 Survey Unit MA-1-2 ATS Tunnel -North end.1 ii'il.3 Measure from this point MA-1-2 AREA: ATS Tunnel -North end Measurement Locations and results Location I X Co-ord (im) Y Co-ord (m) dpml1 00-cm 2 Type Notes 2.6 Edge SM-1 699 Systematic N/A 5.4 Edge SM-2 615 Systematic N/A 8.2 Edge SM-3 741 Systematic N/A 1.3 2.0 SM-4 1210 Systematic N/A 4.0 2.0 SM-5 538 Systematic N/A 6.8 2.0 SM-6 937 Systematic N/A 9.6 2.0 SM-7 979 Systematic N/A 12.4 2.0 SM-8 909 Systematic N/A 15.2 2.0 SM-9 1119 Systematic N/A 18.0 2.0 SM-10 741 Systematic N/A 20.7 2.0 SM-1 1 986 Systematic N/A All sample points are measured from the point shown on the map. For SM-1 through SM-3, place the probe along the top edge of the trench side.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 7 of 48 Survey Unit MA-1-3 ATS Tunnel -South end of East Wall I *ffal *fu Off*ffiEl 4iiýMA-1-3 AREA: ATS Tunnel -South end of East Wall Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpm/1 00-cm 2 Type Notes 1.6 1.3 SM-1 948 Systematic N/A 5.4 1.3 SM-2 897 Systematic N/A 9.2 1.3 SM-3 440 Systematic N/A 13.0 1.3 SM-4 371 Systematic N/A 16.8 1.3 SM-5 1000 Systematic N/A 20.6 1.3 SM-6 845 Systematic N/A 24.4 1.3 SM-7 483 Systematic N/A 28.2 1.3 SM-8 457 Systematic N/A 32.0 1.3 SM-9 1000 Systematic N/A 35.8 1.3 SM-10 603 Systematic N/A 39.5 1.3 SM-11 724 Systematic N/A All sample points are measured from the lower left hand corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 8 of 48 Survey Unit MA-1-4 ATS Tunnel -South end of West Wall I SM-I SM- SSM SSM S- SSM S- SMI MA-1-4 AREA: ATS Tunnel -South end of West Wall Measurement Locations and results Location I X Co-ord (m) Y Co-ord (m) dpml1 00-cm 2 Type Notes 0.9 0.6 SM-1 717 Systematic N/A 4.7 0.6 SM-2 788 Systematic N/A 8.5 0.6 SM-3 761 Systematic N/A 12.3 0.6 SM-4 575 Systematic N/A 16.1 0.6 SM-5 1080 Systematic N/A 19.9 0.6 SM-6 602 Systematic N/A 23.7 0.6 SM-7 549 Systematic N/A 27.5 0.6 SM-8 611 Systematic N/A 31.3 0.6 SM-9 841 Systematic N/A 35.1 0.6 SM-10 575 Systematic N/A 38.9 0.6 SM-11 1035 Systematic N/A All sample points are measured from the lower left hand corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 9 of 48 Survey Unit MA-1-5 ATS Tunnel -South end of the Ceiling MA-1-5 AREA: ATS Tunnel -South end of the Ceiling Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpm/l 00-cm 2 Type Notes 0.2 2.3 SM-1 708 Systematic N/A 3.4 2.3 SM-2 566 Systematic N/A 6.6 2.3 SM-3 487 Systematic N/A 9.9 2.3 SM-4 531 Systematic N/A 13.1 2.3 SM-5 451 Systematic N/A 16.3 2.3 SM-6 655 Systematic N/A 19.5 2.3 SM-7 504 Systematic N/A 22.8 2.3 SM-8 646 Systematic N/A 26.0 2.3 SM-9 434 Systematic N/A 29.2 2.3 SM-10 425 Systematic N/A 32.4 2.3 SM-11 425 Systematic N/A All sample points are measured from the point shown on the map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 10 of 48 Survey Unit MA-1-6 ATS Tunnel -N & S Walls, E & W Walls North End, & Ceiling North End/I!North Wall South Wall 0 MA-1-6 AREA: ATS Tunnel -N & S Walls, E & W Walls North End, & Ceiling North End Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpm/lOO-cm 2 Type Notes 2.8 1.3 SM-1 912 Systematic N/A 5.9 1.3 SM-2 549 Systematic N/A 9.0 1.3 SM-3 212 Systematic N/A 12.1 1.3 SM-4 327 Systematic N/A 2.8 1.6 SM-5 947 Systematic N/A 5.9 1.6 SM-6 752 Systematic N/A 0.2 0.7 SM-7 460 Systematic N/A 2.9 2.2 SM-8 487 Systematic N/A 0.2 0.9 SM-9 451 Systematic N/A 0.5 1.0 SM-10 664 Systematic N/A 3.6 1.0 SM-11 1009 Systematic N/A All sample points are measured from the lower left corner of the surface on which they rest.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page I I of 48 Survey Unit MA-2-1 Cooling Tower Basin, Sump Floor MA-2-1 AREA: Cooling Tower Basin, Sump Floor Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpm/100-cm 2 Type Notes 2.8 1.5 SM-1 644 Systematic N/A 1.4 3.9 SM-2 481 Systematic N/A 4.2 3.9 SM-3 407 Systematic N/A edge 6.4 SM-4 474 Systematic N/A 2.5 6.4 SM-5 689 Systematic N/A 5.7 6.4 SM-6 304 Systematic N/A 1.4 7.8 SM-7 889 Systematic N/A 4.2 7.8 SM-8 793 Systematic N/A edge 11.3 SM-9 378 Systematic N/A 2.8 11.3 SM-10 452 Systematic N/A 5.7 '11.3 SM-1i 393 Systematic N/A-Ail or me sample measurements are taKen from me lower left corner or mne surface on wnicn they rest.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 12 of 48 Survey Unit MA-2-2 Cooling Tower Basin, Sump Ceiling MA-2-2 AREA: Cooling Tower Basin, Sump Ceiling Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpmll 00-cm2 Type Notes 1.4 0.9 SM-1 741 Systematic N/A 1.0 2.5 SM-2 547 Systematic N/A 2.8 5.2 SM-3 777 Systematic N/A 1.4 1.5 SM-4 987 Systematic N/A 0.9 1.5 SM-5 981 Systematic N/A 2.8 1.9 SM-6 871 Systematic N/A 1.4 1.3 SM-7 704 Systematic N/A 0.9 6.9 SM-8 630 Systematic N/A 0.5 edge SM-9 707 Systematic N/A 3.9 edge SM-1 0 827 Systematic N/A 7.1 edge SM-11 919 Systematic N/A All of the sample measurements are taken from the lower left corner of the surface on which they rest, unless noted on map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 13 of 48 Survey Unit MA-2-3 Cooling Tower Basin, Sump Ceiling it I [fyi S I M-1 I II II MA-2-3 AREA: Cooling Tower Basin, Sump Ceiling Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpm/1 00-cm 2 Type Notes 1.4 edge SM-1 956 Systematic N/A 1.1 0.7 SM-2 540 Systematic N/A 1.7 0.7 SM-3 432 Systematic N/A 0.4 0.7 SM-4 385 Systematic N/A 1.0 3.3 SM-5 655 Systematic N/A edge 3.3 SM-6 475 Systematic N/A 0.5 3.3 SM-7 849 Systematic N/A 0.6 1.1 SM-8 -7 Systematic N/A 0.9 0.9 SM-9 396 Systematic N/A 0.8 4.3 SM-10 317 Systematic N/A 1.2 4.3 SM-11 353 Systematic N/A All Ot tne sample measurements are taken from the lower left corner of the surface on wnicn they rest, unless noted on map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 14 of 48 Survey Unit MA-2-4 Cooling Tower Basin, Sump Walls MA-2-4 AREA: Cooling Tower Basin, Sump Walls Measurement Locations and results Location I X Co-ord (m) Y Co-ord (im) dpm/1 00-cm2 Type Notes 3.0 0.4 SM-1 518 Systematic N/A Edge 0.4 SM-2 570 Systematic N/A 0.7 0.4 SM-3 644 Systematic N/A 1.1 3.6 SM-4 726 Systematic N/A 1.2 3.6 SM-5 612 Systematic N/A 2.0 3.6 SM-6 622 Systematic N/A 2.6 3.6 SM-7 459 Systematic N/A 1.6 0.7 SM-8 430 Systematic N/A 5.5 0.7 SM-9 444 Systematic N/A 0.4 0.7 SM-10 584 Systematic N/A 2.9 0.7 SM-11 554 Systematic N/A All of the sample measurements are taken from the lower left corner of the surface on which they rest, unless noted on map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 15 of 48 Survey Unit MA-2-5 Cooling Tower Basin Sump, Floor & Walls.........

...rs M -]I MA-2-5 AREA: Cooling Tower Basin Sump, Floor & Walls Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpmll00-cm 2 Type Notes 1.3 1.2 SM-1 540 Systematic N/A 4 1.2 SM-2 381 Systematic N/A 0.7 0.5 SM-3 911 Systematic N/A 3.4 0.5 SM-4 407 Systematic N/A 1.2 0.5 SM-5 674 Systematic N/A 0 0.5 SM-6 681 Systematic N/A 2 2.9 SM-7 525 Systematic N/A-1.4 2.9 SM-8 733 Systematic N/A 2.6 -0.6 SM-9 446 Systematic N/A 1.3 1.7 SM-10 647 Systematic N/A 4 1.7 SM-11 669 Systematic N/A All of the sample measurements are taken from the lower left corner of the surface on which they rest, unless noted on map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 16 of 48 Survey Unit MA-2-6 Cooling Tower Basin, Floor Section #1 MA-2-6 AREA: Cooling Tower Basin, Floor Section #1 Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpm/100-cm 2 Type Notes 0.7 1.4 SM-1 758 Systematic N/A 3.3 1.4 SM-2 847 Systematic N/A 5.9 1.4 SM-3 420 Systematic N/A 2.0 3.7 SM-4 764 Systematic N/A 4.6 3.7 SM-5 605 Systematic N/A 0.7 5.9 SM-6 592 Systematic N/A 3.3 5.9 SM-7 427 Systematic N/A 5.9 5.9 SM-8 682 Systematic N/A 2.0 8.2 SM-9 732 Systematic N/A 4.6 8.2 SM-10 376 Systematic N/A 7.3 8.2 SM-11 949 Systematic N/A All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 17 of 48 Survey Unit MA-2-7 Cooling Tower Basin, Floor Section #2 MA-2-7 AREA: Cooling Tower Basin, Floor Section #2 Measurement Locations and results Location I X Co-ord (m) Y Co-ord (m dpm/100-cm 2 Type Notes 1.1 0.7 SM-1 675 Systematic N/A 4.5 0.7 SM-2 701 Systematic N/A 7.9 0.7 SM-3 822 Systematic N/A 11.3 0.7 SM-4 803 Systematic N/A 14.6 0.7 SM-5 898 Systematic N/A 18 0.7 SM-6 605 Systematic N/A 2.8 3.6 SM-7 408 Systematic N/A 6.2 3.6 SM-8 739 Systematic N/A 9.6 3.6 SM-9 618 Systematic N/A 12.9 3.6 SM-10 510 Systematic N/A 16.3 3.6 SM-11 675 Systematic N/A All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 18 of 48 Survey Unit MA-2-8 Cooling Tower Basin, Floor Section #3 MA-2-8 AREA: Cooling Tower Basin, Floor Section #3 Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpm/1 00-cm 2 Type Notes 1.2 0.7 SM-1 500 Systematic N/A 4.6 0.7 SM-2 564 Systematic N/A 8 0.7 SM-3 536 Systematic N/A 11.4 0.7 SM-4 557 Systematic N/A 14.8 0.7 SM-5 500 Systematic N/A 18.2 0.7 SM-6 493 Systematic N/A 2.9 3.6 SM-7 750 Systematic N/A 6.3 3.6 SM-8 543 Systematic N/A 9.7 3.6 SM-9 593 Systematic N/A 13.1 3.6 SM-10 771 Systematic N/A 16.5 3.6 SM-11 757 Systematic N/A All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 19 of 48 Survey Unit MA-2-9 Cooling Tower Basin, Floor Section #4 MA-2-9 AREA: Cooling Tower Basin, Floor Section #4 Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpm/1 00-cm2 Type Notes 0.9 0.2 SM-1 711 Systematic N/A 4.3 0.2 SM-2 904 Systematic N/A 7.7 0.2 SM-3 1170 Systematic N/A 11.1 0.2 SM-4 1220 Systematic N/A 14.5 0.2 SM-5 1120 Systematic N/A 17.9 0.2 SM-6 1207 Systematic N/A 2.6 3.1 SM-7 415 Systematic N/A 6 3.1 SM-8 378 Systematic N/A 9.4 3.1 SM-9 667 Systematic N/A 12.8 3.1 SM-1 667 Systematic N/A 16.2 3.1 SM-11 585 Systematic N/A All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 20 of 48 Survey Unit MA-2-10 Cooling Tower Basin, Floor Section #5 MA-2-10 AREA: Cooling Tower Basin, Floor Section #5 Measurement Locations and results Location /X Co-ord (m) Y Co-ord (im) dpm/100-cm2 Type Notes 1.1 0.6 SM-1 758 Systematic N/A 4.5 0.6 SM-2 567 Systematic N/A 7.9 0.6 SM-3 682 Systematic N/A 11.3 0.6 SM-4 739 Systematic N/A 14.7 0.6 SM-5 745 Systematic N/A 18.1 0.6 SM-6 968 Systematic N/A 2.8 3.5 SM-7 1150 Systematic N/A 6.2 3.5 SM-8 1010 Systematic N/A 9.6 3.5 SM-9 248 Systematic N/A 13 3.5 SM-10 694 Systematic N/A 16.4 3.5 SM-11 1410 Systematic N/A All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 21 of 48 Survey Unit MA-2-11 Cooling Tower Basin, Floor Section #6 SM- lh SMNSM -S SM-I 1iM MA-2-11 AREA: Cooling Tower Basin, Floor Section #6 Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpm/1 00-cm 2 Type Notes 0.2 0 SM-1 615 Systematic N/A 3.5 0 SM-2 415 Systematic N/A 6.8 0 SM-3 304 Systematic N/A 10.2 0 SM-4 407 Systematic N/A 13.5 0 SM-5 126 Systematic N/A 16.8 0 SM-6 585 Systematic N/A 1.8 2.9 SM-7 481 Systematic N/A 5.2 2.9 SM-8 637 Systematic N/A 8.5 2.9 SM-9 659 Systematic N/A 11.8 2.9 SM-10 578 Systematic N/A 15.2 2.9 SM-11 563 Systematic N/A 18.6 2.9 SM-12 696 Systematic N/A All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 22 of 48 Survey Unit MA-2-12 Cooling Tower Sump, Exterior Walls S '&A. I Ism Ism Ism Ism Ism ISM-1 ISM-11 I -I I I=n @son VYM71 -TTs-mF-I Fý F-1 I f-l,4 ESM DonnE-I uwnw~inun MA-2-12 AREA: Cooling Tower Sump, Exterior Walls Measurement Locations and results Location /X Co-ord (im) Y Co-ord (m) dpm/100-cm 2 Type Notes 0.6 0.4 SM-i 611 Systematic N/A 0.2 1.5 SM-2 669 Systematic N/A 5.7 1.5 SM-3 834 Systematic N/A 14.0 1.5 SM-4 573 Systematic N/A 1.2 0.2 SM-5 25 Systematic N/A 3.9 0.2 SM-6 535 Systematic N/A 6.7 0.2 SM-7 484 Systematic N/A 9.4 0.2 SM-8 561 Systematic N/A 12.2 0.2 SM-9 312 Systematic N/A 14.9 0.2 SM-10 535 Systematic N/A 17.7 0.2 SM-11 223 Systematic N/A All of the sample measurements are taken from the lower left corner of the surface on which they rest, unless noted on map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 23 of 48 Survey Unit MA-2-13 Cooling Tower Sump, Exterior Walls and Roof (South end)0 0 o0 o0 SM1ýO 0M, I I 0 0*M 0 0 0 FS _M11 MA-2-13 AREA: Cooling TowerSump, Exterior Walls and Roof (South end)Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpm/100-cm2 Type Notes edge edge SM-1 62 Systematic N/A 0.3 0.4 SM-2 979 Systematic N/A 3.3 0.4 SM-3 1210 Systematic N/A 6.3 0.4 SM-4 1100 Systematic N/A 1.8 3 SM-5 1200 Systematic N/A 7.8 3 SM-6 959 Systematic N/A 0.3 5.6 SM-7 1130 Systematic N/A 3.3 5.6 SM-8 1070 Systematic N/A 6.3 5.6 SM-9 1160 Systematic N/A 1.8 8.2 SM-10 842 Systematic N/A 7.8 8.2 SM-11 1380 Systematic N/A All of the sample measurements are taken from the lower left corner of the surface on which they rest, unless noted on map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 24 of 48 Survey Unit MA-2-14 Cooling Tower Sump, Exterior Walls and Roof (North end)SM41 o 0 o 0 o 0 0 0 SM MA-2-14 AREA: Cooling TowerSump, Exterior Walls and Roof (North end)Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpm/l 00-cm 2 Type Notes 0.5 0.3 SM-1 770 Systematic N/A 5.5 0.3 SM-2 1190 Systematic N/A 3.0 4.7 SM-3 1310 Systematic N/A 8.1 4.7 SM-4 1110 Systematic N/A 3.9 0.9 SM-5 856 Systematic N/A 9 0.9 SM-6 885 Systematic N/A 14 0.9 SM-7 950 Systematic N/A 19.1 0.9 SM-8 1250 Systematic N/A 24.1 0.9 SM-9 899 Systematic N/A 29.2 0.9 SM-10 856 Systematic N/A 34.2 0.9 SM-11 568 Systematic N/A All of the sample measurements are taken from the lower left corner of the surface on which they rest, unless noted on map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 25 of 48 Survey Unit MA-2-15 Cooling Tower Sump, Steel Pipes LI~1 ~IZ EJEUI D D MA-2-15 AREA: Cooling Tower Sump,Steel Pipes Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpm/100-cm 2 Type Notes 0.7 0.6 SM-1 -263 Systematic N/A 0.4 0.6 SM-2 86 Systematic N/A edge 0.6 SM-3 -302 Systematic N/A 0.3 0.6 SM-4 108 Systematic N/A 0.5 0.6 SM-5 43 Systematic N/A 1.2 0.7 SM-6 -101 Systematic N/A 0.5 2 SM-7 388 Systematic N/A 1.9 2 SM-8 216 Systematic N/A 1.2 3.2 SM-9 -79 Systematic N/A 0.5 4.4 SM-10 144 Systematic N/A 1.9 4.4 SM-11 -108 Systematic N/A All of the sample measurements are taken from the lower left corner of the surface on which they rest, unless noted on map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 26 of 48 Survey Unit MA-3-1 WEMS Sump Floor 4i5 MA-3-1 AREA: WEMS Sump Floor Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpmI100-cm 2 Type Notes 0.2 1.2 SM-1 799 Systematic N/A 2.6 1.2 SM-2 597 Systematic N/A 5.2 1.2 SM-3 820 Systematic N/A 7.6 1.2 SM-4 446 Systematic N/A 1.4 3.3 SM-5 561 Systematic N/A 3.9 3.3 SM-6 532 Systematic N/A 6.4 3.3 SM-7 504 Systematic N/A 0.2 5.5 SM-8 1180 Systematic N/A 2.6 5.5 SM-9 511 Systematic N/A 5.2 5.5 SM-10 367 Systematic N/A 7.6 5.5 SM-11 446 Systematic N/A All of the sample measurements are taken from the lower left corner of the surface on which they rest.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 27 of 48 Survey Unit MA-3-2 WEMS Sump Walls and Ledges Measure SMs: 4, 5 and 6 from this point.Measure SMs 7 and 8 from this point.I II I I 11 FSM-I-4 Measure SMs 1 from this point.ýýI r I MA-3-2 AREA: WEMS Sump Walls and Ledges Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpm/100-cm 2 Type Notes edge 3.3 SM-1 674 Systematic N/A 1.5 0.8 SM-2 104 Systematic N/A 4.7 0.8 SM-3 378 Systematic N/A 1.6 0.8 SM-4 356 Systematic N/A 4.8 0.8 SM-5 570 Systematic N/A 8.0 0.8 SM-6 363 Systematic N/A 2.4 0.8 SM-7 644 Systematic N/A 5.6 0.8 SM-8 481 Systematic N/A 1.5 0.8 SM-9 267 Systematic N/A 4.6 0.8 SM-10 430 Systematic N/A edge 0.8 SM-11 489 Systematic N/A All of the sample measurements are taken from the lower left corner of the surface on which they rest or from location identified on map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 28 of 48 Survey Unit MA-3-3 WEMS Pump Slab Walls and Misc Sections Measure SM-8 from this point.LrLr Measure SM-point.[Measure SM-3 from this point.Measure SM-I and SM-2 from this point.IqM.11 IRMu MA-3-3 AREA: WEMS Pump Slab Walls and Misc Sections Measurement Locations and results Location /X Co-ord (m) Y Co-ord (im) dpm/I 00-cm 2 Type Notes 1.0 0.3 SM-1 745 Systematic N/A 4.1 0.3 SM-2 936 Systematic N/A 0.7 edge SM-3 771 Systematic N/A 0.3 1.5 SM-4 987 Systematic N/A 2.2 1.5 SM-5 873 Systematic N/A 2.2 2.0 SM-6 1140 Systematic N/A 2.8 0.6 SM-7 777 Systematic N/A 2.2 0.8 SM-8 796 Systematic N/A 1.3 3.3 SM-9 796 Systematic N/A 4.4 3.3 SM-10 854 Systematic N/A edge edge SM-11 968 Systematic N/A PAll o0 me sample measurements are taKen wrom me lower soutnwest corner or me surface on which they rest or from the location identified on map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 29 of 48 Survey Unit MA-3-4 WEMS Walls..BI=[ý ISM ýI l lSMn U Li Lu I MA-3-4 AREA: WEMS Walls Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpmll 00-cm2 Type Notes 1.2 1.3 SM-1 1020 Systematic N/A 0.7 1.3 SM-2 667 Systematic N/A 4.8 1.3 SM-3 156 Systematic N/A 8.9 1.3 SM-4 896 Systematic N/A 13.0 1.3 SM-5 667 Systematic N/A 17.2 1.3 SM-6 689 Systematic N/A 0.8 1.3 SM-7 919 Systematic N/A 5.0 1.3 SM-8 681 Systematic N/A 9.1 1.3 SM-9 1160 Systematic N/A 13.3 1.3 SM-10 726 Systematic N/A 17.4(edge) 1.3 SM-I1 1020 Systematic N/A All of the sample measurements are taken from the lower left corner of the surface on which they rest.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 30 of 48 Survey Unit MA-3-5 WEMS Flumes and Gates Measure SM-I I from this SM-l I CD CD CD KI -1'-m1 17f-]F7tunx1~]jaý Ism-21 MA ISMA ISMA ISM4 10--A ISM-81 ISM4 MA-3-5 AREA: WEMS Flumes and Gates Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpmnll00-cm 2 Type Notes 1.4 edge SM-1 1530 Systematic N/A 1.6 edge SM-2 1450 Systematic N/A 0.6 edge SM-3 1800 Systematic N/A edge edge SM-4 1560 Systematic N/A 2.2 edge SM-5 956 Systematic N/A 1.7 edge SM-6 1410 Systematic N/A edge edge SM-7 701 Systematic N/A edge edge SM-8 1300 Systematic N/A 2.7 edge SM-9 1660 Systematic N/A edge 1.7 SM-10 715 Systematic N/A 1.0 edge SM-11 818 Systematic N/A All of the sample measurements are taken from the lower left corner of the surface on which they rest or from the location identified on the map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 31 of 48 Survey Unit MA-3-6 WEMS Trash Screen Walls, Ceiling and Floor IuEg Measure SM-2 from this point.MA-3-6 AREA: WEMS Trash Screen Walls, Ceiling and Floor Measurement Locations and results Location I X Co-ord (m) Y Co-ord (m) dpm/l00-cm 2 Type Notes 2.0 1.7 SM-1 624 Systematic N/A 1.0 1.0 SM-2 1330 Systematic N/A 1.8 0.4 SM-3 618 Systematic N/A-0.5 0.4 SM-4 561 Systematic N/A 1.6 0.4 SM-5 38 Systematic N/A 1.6 2.2 SM-6 643 Systematic N/A 0.7 2.2 SM-7 420 Systematic N/A 2.9 2.2 SM-8 962 Systematic N/A-1.6 2.2 SM-9 745 Systematic N/A 0.5 2.2 SM-10 790 Systematic N/A edge 1.9 SM-1 1 777 Systematic N/A All of the sample measurements are taken from the lower left corner of the surface on which they rest or from the location identified on the map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 32 of 48 Survey Unit MA-3-7 WEMS Floor 77*j~ ~ M-i liý" MA-3-7 AREA: WEMS Floor Measurement Locations and results Location /X Co-ord (in) Y Co-ord (m) dpml1 00-cm 2 Type Notes 0.6 1.6 SM-1 696 Systematic N/A 3.0 1.6 SM-2 667 Systematic N/A 1.9 3.9 SM-3 1096 Systematic N/A 0.6 6.3 SM-4 1100 Systematic N/A 3.0 6.3 SM-5 911 Systematic N/A 1.9 8.6 SM-6 756 Systematic N/A 0.6 10.9 SM-7 763 Systematic N/A 3.0 10.9 SM-8 674 Systematic N/A 1.9 13.3 SM-9 526 Systematic N/A 0.6 15.6 SM-10 956 Systematic N/A 3.0 15.6 SM-11 489 Systematic N/A All of the sample measurements are taken from the lower left corner of the surface on which they rest.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 33 of 48 Survey Unit MA-4-1 West Sludge Basin, Floor Section #1 MA-4-1 AREA: West Sludge Basin, Floor Section #1 Measurement Locations and results Location /X Co-ord (im) Y Co-ord (m) dpm/100-cm 2 Type Notes 0.3 2.3 SM-1 556 Systematic N/A 3.0 2.3 SM-2 516 Systematic N/A 5.7 2.3 SM-3 758 Systematic N/A 1.7 4.6 SM-4 732 Systematic N/A 4.4 4.6 SM-5 673 Systematic N/A 7.1 4.6 SM-6 895 Systematic N/A 9.8 4.6 SM-7 601 Systematic N/A 0.3 7.0 SM-8 641 Systematic N/A 3.0 7.0 SM-9 654 Systematic N/A 5.7 7.0 SM-10 641 Systematic N/A 8.4 7.0 SM-11 399 Systematic N/A All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 34 of 48 Survey Unit MA-4-2 West Sludge Basin, Floor Section #2 MA-4-2 AREA: West Sludge Basin, Floor Section #2 Measurement Locations and results Location /X Co-ord (m) Y Co-ord (im) dpm/100-cm 2 Type Notes 1.9 0.5 SM-1 412 Systematic N/A 4.7 0.5 SM-2 810 Systematic N/A 7.5 0.5 SM-3 621 Systematic N/A 10.2 0.5 SM-4 536 Systematic N/A 13.0 0.5 SM-5 536 Systematic N/A 0.3 1.1 SM-6 248 Systematic N/A 3.1 1.1 SM-7 889 Systematic N/A 1.7 1.7 SM-8 366 Systematic N/A 8.8 -2.2 SM-9 497 Systematic N/A 0.3 1.4 SM-10 353 Systematic N/A 3.1 1.4 SM-11 412 Systematic N/A All OT me sample measurements are taken rrom me soutnwest corner OT me surface on wnicn they rest.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 35 of 48 Survey Unit MA-4-3 West Sludge Basin, North, South & West Walls SMI S SM SM SM SM SM SM SMI FM LIJIE 0 IEI II= 1 L- ____MA-4-3 AREA: West Sludge Basin, North, South & West Walls Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpm/100-cm2 Type Notes 1.6 0.6 SM-1 699 Systematic N/A 5.5 0.6 SM-2 536 Systematic N/A 9.5 0.6 SM-3 471 Systematic N/A 13.4 0.6 SM-4 771 Systematic N/A 2.4 0.6 SM-5 353 Systematic N/A 6.4 0.6 SM-6 425 Systematic N/A 0.6 0.6 SM-7 451 Systematic N/A 4.5 0.6 SM-8 124 Systematic N/A 8.5 0.6 SM-9 359 Systematic N/A 12.4 0.6 SM-10 562 Systematic N/A 0.7 edge SM-11 497 Systematic N/A All sample measurements are taken from the lower left corner of the surface on which they rest.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 36 of 48 Survey Unit MA-4-4 West Sludge Basin, East Wall, Short Wall & Valve Pits 0 Measure SM-I from this point L Measure SM-10 from this point L1II MA-4-4 AREA: West Sludge Basin, East Wall, Short Wall & Valve Pits Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpmll 00-cm 2 Type Notes edge -2.6 SM-1 582 Systematic N/A 3.5 -1.0 SM-2 490 Systematic N/A 7.4 -1.0 SM-3 203 Systematic N/A 3.5 -0.2 SM-4 216 Systematic N/A 7.3 -0.2 SM-5 327 Systematic N/A 2.6 -0.2 SM-6 314 Systematic N/A 1.8 -1.0 SM-7 418 Systematic N/A 1.8 -1.0 SM-8 647 Systematic N/A 5.6 -1.0 SM-9 490 Systematic N/A 0.3 -0.4 SM-10 438 Systematic N/A 0.8 -0.8 SM-11 353 Systematic N/A All of the sample measurements are taken from the locations shown on the map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 37 of 48 Survey Unit MA-4-5 East Sludge Basin, Floor Section #1 MA-4-5 AREA: East Sludge Basin, Floor Section #1 Measurement Locations and results Location I X Co-ord (m) Y Co-ord (m) dpmll 00-cm 2 Type Notes 9.6 -2.4 SM-1 699 Systematic N/A 2.8 -0.0 SM-2 500 Systematic N/A 5.5 -0.0 SM-3 1037 Systematic N/A 8.2 -0.0 SM-4 801 Systematic N/A 10.9 -0.0 SM-5 735 Systematic N/A 1.4 2.3 SM-6 441 Systematic N/A 4.2 2.3 SM-7 853 Systematic N/A 6.9 2.3 SM-8 721 Systematic N/A 9.6 2.3 SM-9 471 Systematic N/A 8.2 4.7 SM-10 684 Systematic N/A 10.9 4.7 SM-11 772 Systematic N/A All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 38 of 48 Survey Unit MA-4-6 East Sludge Basin, Floor Section #2 MA-4-6 AREA: East Sludge Basin, Floor Section #2 Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpml1 00-cm2 Type Notes 0.1 1.0 SM-1 618 Systematic N/A 2.9 1.0 SM-2 728 Systematic N/A 5.7 1.0 SM-3 463 Systematic N/A 8.5 1.0 SM-4 728 Systematic N/A 11.2 1.0 SM-5 566 Systematic N/A 1.5 1.6 SM-6 559 Systematic N/A 0.1 0.3 SM-7 728 Systematic N/A 2.9 1.2 SM-8 787 Systematic N/A 1.5 2.6 SM-9 654 Systematic N/A 0.4 1.7 SM-10 1100 Systematic N/A 3.2 1.7 SM-11 971 Systematic N/A All of the sample measurements are taken from the southwest corner of the floor section on which they rest.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 39 of 48 Survey Unit MA-4-7 East Sludge Basin, North, East and South Walls 0-NiA I *ffi, 4ý *ý iýý*4 ý 4*ýýJ I0 L1i 0 MA-4-7 AREA: East Sludge Basin, North, East and South Walls Measurement Locations and results Location /X Co-ord (m) YCo-ordJ!m) dpml100-cm 2 Type Notes 3.0 1.1 SM-1 868 Systematic N/A 6.1 1.1 SM-2 419 Systematic N/A 9.2 1.1 SM-3 471 Systematic N/A 12.3 1.1 SM-4 750 Systematic N/A 0.5 1.1 SM-5 662 Systematic N/A 3.5 1.1 SM-6 360 Systematic N/A 6.6 1.1 SM-7 544 Systematic N/A 9.7 1.1 SM-8 544 Systematic N/A 3.1 1.1 SM-9 471 Systematic N/A 6.2 1.1 SM-10 647 Systematic N/A 9.3 1.1 SM-11 471 Systematic N/A All of the sample measurements are taken from the lower left corner of the wall surface on which they rest.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 40 of 48 Survey Unit MA-4-8 East Sludge Basin, West Wall, Short Wall & Valve Pit MA-4-8 AREA: East Sludge Basin, West Wall, Short Wall & Valve Pit Measurement Locations and results Location I X Co-ord (m) Y Co-ord (m) dpm/l 00-cm2 Type Notes 1.6 -0.3 SM-1 662 Systematic N/A 5.5 -0.3 SM-2 926 Systematic N/A 9.5 -0.3 SM-3 949 Systematic N/A 0.1 1.3 SM-4 713 Systematic N/A 1.0 1.3 SM-5 772 Systematic N/A 2.4 0.2 SM-6 434 Systematic N/A 2.5 0.2 SM-7 426 Systematic N/A 6.5 0.2 SM-8 912 Systematic N/A 1.5 0.2 SM-9 588 Systematic N/A 5.5 0.0 SM-10 713 Systematic N/A 1.2 0.3 SM-1 1 485 Systematic N/A All of the sample measurements are taken from the point shown on the map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 41 of 48 Survey Unit MA-4-9 Sludge Basins, Outside Walls, Top Ledges and Sump U ~~ I I I I I I, U. I aJ L Ifft Lai 11 Measure SM-1 through SM-6 from this noint.W-t Wa East Wl.V North WON -t -en MA-4-9 AREA: Sludge Basins, Outside Walls, Top Ledges and Sump Measurement Locations and results Location /X Co-ord (m) Y Co-ord (m) dpm/1 00-cm 2 Type Notes 0.8 Edge SM-1 1560 Systematic N/A 3.6 Edge SM-2 2190 Systematic N/A 6.3 Edge SM-3 1970 Systematic N/A 9.0 Edge SM-4 1760 Systematic N/A 11.7 Edge SM-5 1100 Systematic N/A 14.4 Edge SM-6 1330 Systematic N/A 4.2 0.1 SM-7 1550 Systematic N/A 8.9 0.1 SM-8 1710 Systematic N/A 0.1 1.04 SM-9 49 Systematic N/A 2.8 1.04 SM-10 63 Systematic N/A 1.4 3.4 SM-1 1 743 Systematic N/A All of the sample measurements are taken from the point shown on the map.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 42 of 48 Survey Unit MA-5-1 Reactor Substation (1161)A MA-5-1 AREA: Reactor Substation (1161)Measurement Locations and results Location I dpm/100-X Co-ord (m) Y Co-ord (m) cm 2 Type Notes 2.5' east of west pad A edge 1.5' north of south pad A edge SM-1 777 Systematic N/A 0.5' east of west pad B edge 5.5' north of south pad B edge SM-2 876 Systematic N/A 15' east of west pad B edge 5.5' north of south pad B edge SM-3 306 Systematic N/A 7.5' east of west pad B edge 18' north of south pad B edge SM-4 421 Systematic N/A 22' east of west pad B edge 18' north of south pad B edge SM-5 628 Systematic N/A 2' east of vault SW floor corner 4' north of vault SW floor corner SM-6 Not Taken Systematic N/A 7.5' east of vault SW ceiling corner 3.5' north of vault SW ceiling corner SM-7 967 Systematic N/A 1.5' below vault ceiling 10' south of north vault wall SM-8 653 Systematic N/A 6' below vault ceiling 10' south of north vault wall SM-9 388 Systematic N/A 0.5' east of vault SW ceiling corner 16.5' north of vault SW ceiling corner SM-10 653 Systematic N/A 2' east of west vault wall 4' below vault ceiling SM-11 744 Systematic N/A Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 43 of 48 Survey Unit MA-5-2 Pads and Foundations West of the Reactor Building-11 Air Intake RB Roll-up Door Viewing Gallery Pad RB Man Door~11111 I I I IIIILEL-9 Transformer Pad ESidewalk MA-5-2 AREA: Pads and Foundations West of the Reactor Building Measurement Locations and results Location / dpm/100-X Co-ord (m) Y Co-ord (m) cm 2 Type Notes 2.4m east of west sidewalk edge 1.3m north of south sidewalk edge SM-1 887 Systematic N/A 6.1m east of west sidewalk edge 1.3m north of south sidewalk edge SM-2 1315 Systematic N/A 9.8m east of west sidewalk edge 1.3m north of south sidewalk edge SM-3 718 Systematic N/A 13.5m east of west sidewalk edge 1.3m north of south sidewalk edge SM-4 661 Systematic N/A 17.2m east of west sidewalk edge 1.3m north of south sidewalk edge SM-5 879 Systematic N/A 20.9m east of west sidewalk edge 1.3m north of south sidewalk edge SM-6 863 Systematic N/A 24.6m east of west sidewalk edge 1.3m north of south sidewalk edge SM-7 855 Systematic N/A 1.2m south of north transformer pad edge 2.9m east of west transformer pad edge SM-8 1274 Systematic N/A 4.9m south of north transformer pad edge 2.9m east of west transformer pad edge SM-9 1008 Systematic N/A 2.Om east of west roll-up door pad edge 2.7m north of south roll-up door pad edge SM-10 699 Systematic N/A 0.9m east of west air intake floor edge 1.6m north of south air intake floor edge SM-11 976 Systematic N/A Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 44 of 48 Survey Unit MA-5-3 Pads and Foundations East of the Hot Lab & Reactor Building Tofle~/Air Intake RB NE Comer HPT Roof SW comer MA-5-3 AREA: Pads and Foundations East of the Hot Lab & Reactor Building Measurement Locations and results Location I dpmll 00-X Co-ord (m) Y Co-ord (m) Type Notes 0.8 m east of HPT Roof SVV comer 0.10 m north of HPT Roof SW comer SM-1 736 Systematic N/A 3.7 m east of HPT Roof SW comer 0.10 m north of HPT Roof SW comer SM-2 338 Systematic N/A 6.6 m east of HPT Roof SW comer 0.10 m north of HPT Roof SW comer SM-3 277 Systematic N/A 9.5 m east of HPT Roof SW comer 0.10 m north of HPT Roof SW comer SM-4 1135 Systematic N/A 2.3 m east of HPT Roof SW comer 2.5 m north of HPT Roof SW comer SM-5 689 Systematic N/A 5.2 m east of HPT Roof SW comer 2.5 m north of HPT Roof SW comer SM-6 628 Systematic N/A 8.0 m east of HPT Roof SW comer 2.5 m north of HPT Roof SW comer SM-7 831 Systematic N/A 9.5 m east of HPT Roof SW comer 4.9 m north of HPT Roof SW comer SM-8 757 Systematic N/A 0.1 m from top edge 0.5 m from RB wall SM-9 696 Systematic N/A 0.1 m from top edge 0.2 m from RB wall SM-10 980 Systematic N/A 0.1 m from top edge 0.5 m from RB wall SM-11 399 Systematic N/A Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 45 of 48 Survey Unit MA-5-4 Substation 4 & Equipment Ramp at E Hot Lab Rollup Door HPT cover D-NE Comer SM-I F-1 HPT Roof MA-5-4 AREA: Substation 4 and Equip. Ramp at E Hot Lab Rollup Door Measurement Locations and results Location / dpm/100-X Co-ord (m) Y Co-ord (m) cm 2 Type Notes 1.4 m east of SW comer 0.1 m down from top edge SM-1 360 Systematic N/A 1.0 m north of SE comer 0.2 m down from top edge SM-2 770 Systematic N/A 0.2 m down from top edge 0.2 m south of north edge SM-3 784 Systematic N/A 0.8 m west of east edge 0.2 m south of north edge SM-4 417 Systematic N/A 0.5 m south of north edge 2.0 m east of roll up door SM-5 532 Systematic N/A 2.2 m east of HLB wall 0.2 m north of south edge SM-6 1173 Systematic N/A 0.8 m from NE comer 1.6 m up from floor SM-7 871 Systematic N/A 0.2 m from SE comer 1.6 m up from floor SM-8 856 Systematic N/A 0.8 m from SW corner 1.6 m up from floor SM-9 734 Systematic N/A 0.5 m east of HLB wall 3.0 m north of south edge SM-I0 619 Systematic N/A 0.2 m down from top edge 3.0 m north of south edge SM-11 683 Systematic N/A Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 46 of 48 Survey Unit MA-5-5 RSCB Sidewalks and Misc. Pads Curb Face outside of Reactor Security Building Curb Top outside of Reactorl Security Building r S SN Sidewalk SW of Reactor i-- Security Building a Electrical Pit SE of Reactor Security D M MA-5-6 AREA: RSCB Sidewalks and Misc. Pads Measurement Locations and results Location /X Co-ord (m) Y Co-ord (im) dpm/1 00-cm2 Type Notes 0.4 0.2 SM-1 365 Systematic N/A 1.0 0.5 SM-2 1034 Systematic N/A 1.5 0.3 SM-3 770 Systematic N/A 5.4 0.4 SM-4 743 Systematic N/A 0.6 0.4 SM-5 682 Systematic N/A 3.8 0.4 SM-6 568 Systematic N/A 0.5 3.3 SM-7 1135 Systematic N/A 0.5 8.8 SM-8 1068 Systematic N/A 0.5 14.3 SM-9 676 Systematic N/A 0.5 19.8 SM-10 1284 Systematic N/A 0.5 25.4 SM-1 1 838 Systematic N/A The X, Y coordinates for survey locations SM-1 thru SM-11 are measured from the lower left comer of the map surface on which they rest.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 47 of 48 Survey Unit MA-5-6 WEMS Outfall Wing Wall and Drying Basin Sluice Gates IMI ISM-I """ 7 WEMS Outfall Wing Wall MA-5-6 AREA: WEMS Outfall Wing Wall and Drying Basin Sluice Gates Measurement Locations and results Location I X Co-ord (m) Y Co-ord (m) dpm/100-cm 2 Type Notes 1.9 -0.3 SM-1 791 Systematic N/A 1.3 -0.3 SM-2 831 Systematic N/A 1.7 -0.3 SM-3 750 Systematic N/A Edge 0.2 SM-4 797 Systematic N/A 3.9 0.2 SM-5 628 Systematic N/A 7.8 0.2 SM-6 797 Systematic N/A 1.1 0.1 SM-7 784 Systematic N/A 4.9 0.1 SM-8 723 Systematic N/A 2.0 0.6 SM-9 845 Systematic N/A 5.9 0.6 SM-10 662 Systematic N/A 3.1 0.8 SM-11 635 Systematic N/A 0.4 0.8 SM-12 689 Systematic N/A The X, Y coordinates for survey locations SM-1 thru SM-3 are measured from the top left corner of the map surface on which they rest.The X, Y coordinates for survey locations SM-4 thru SM-12 are measured from the lower left corner of the map surface on which they rest.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix B Rev. 0, Page 48 of 48 Survey Unit RS-1-1 Reactor Security Building I I Interior Exterior RS-1-1 AREA: Reactor Security Building Measurement Locations and results Location I X Co-ord (m) Y Co-ord (m) dpml1 00-cm 2 Type Notes 4.1 3.1 SM-1 7 Systematic Exterior -West Wall 0.8 3.1 SM-2 180 Systematic Exterior -South Wall 1.3 3.1 SM-3 144 Systematic Exterior -East Wall 7.8 3.1 SM-4 7 Systematic Exterior -East Wall 4.6 3.1 SM-5 86 Systematic Exterior -North Wall 4.8 5.6 SM-6 223 Systematic Ceiling 4.9 1.1 SM-7 137 Systematic Interior -West Wall 4.1 1.1 SM-8 29 Systematic Interior -North Wall 4.9 1.1 1 SM-9 -173 Systematic Interior -East Wall 1.8 1.1 SM-10 -151 Systematic Interior -South Wall 0.8 1.1 SM-11 288 Systematic Interior -South Wall Sample measurements are Trom me lower lent corner or soutnwest corner or me surface on wnicn they rest Plum Brook Reactor Facility Final Status Survey Report Attachment 15 Miscellaneous Structures and Pads Revision 0 Appendix C Evaluation of Revised DCGLs Plum Brook Reactor Facility FSSR, Attachment 15 Appendix C, Rev. 0, Page 2 of 9 TABLE of CONTENTS 1.0 Introdu ction ............................................................................................................................

3 2.0 R evised D C G Ls ..............................................................................................................

4 3.0 Survey Design Calculations with Revised DCGLs ...........................................................

4 4.0 Instrument Sensitivities and Action Levels .......................................................................

5 5.0 Evaluation of FSS Results to Ensure the Dose Criterion is met .......................................

8 Addendum 1 -VSP Design Screens Addendum 2 -Calculation of Revised Equivalent Screening Level DCGL for ALARA Evaluation LIST of TABLES Table 1, Revised D CG Ls for M SP ...................................................................................................

4 Table 2, MSP Survey Design Recalculation Summary ....................................................................

5 Table 3, Revised DCGLEMC Values for MSP Class 1 Survey Units ..............................................

6 Table 4, LMI 44-116 Detector Scan Sensitivity and Investigation Levels for Original and Revised DCG Ls -Class 1 Areas ...........................................................................................

..........

7 Table 5, LMI 44-9 Detector Scan Sensitivity and Investigation Levels for Original and Revised D CG Ls -Class 1 Areas ...........................................................................................

..........

7 Table 6, LMI 44-116 Action Levels and Scan Capabilities for Class 2 Survey Units ....................

8 LIST of FIGURES Figure 1,VSP Screen for Design 22, Survey Unit MA-I-1, ATS Tunnel .................................

AM-Figure 2, VSP Screen for Design 50, Survey Unit MA-2-1, Cooling Tower Basin .......................

Al-2 Figure 3, VSP Design Screen for Design 52, Survey Unit MA-3-1, WEMS .................................

Al-3 Figure 4, VSP Design Screen for Design 53, Survey Unit MA-4-1, Sludge Basins ......................

Al-4 Plum Brook Reactor Facility FSSR, Attachment 15 Appendix C, Rev. 0, Page 3 of 9 1.0 Introduction As part of an NRC inspection at the PBRF Decommissioning Project in July 2011, radiological surveys and records review were performed by the NRC independent verification contractor, ORISE. The ORISE review included a review of gross beta activity DCGL values used by the PBRF to evaluate FSS measurements for compliance with the 25 mrem/y release criterion.

The gross beta activity DCGL values and the radionuclide mixtures used to calculate them are published in a PBRF Technical Basis Document, PBRF-TBD-07-001

[PBRF 2007].The ORISE report, issued in October 2011, identified an error in the gross beta activity DCGL used for the -15 ft. elevation (Area 20) of the Reactor Building, 35,296 dpm/IO00-cm 2.The ORISE report determined that this value did not correctly account for the use of beta surface activity measurements in areas such as the Reactor Building -15 ft. elevation where the radionuclide mixture reported in TBD-07-001 included alpha emitting U-234 [ORISE 2011 ].In subsequent discussions with the NRC, it was agreed that NASA would re-evaluate the method used to calculate DCGLs, with particular attention given to areas where uranium was included in the radionuclide mixture. This evaluation would also include a review of the basis for determining that uranium was present in the radionuclide mixtures.

The results of this re-evaluation, including revised radionuclide mixtures and revised gross activity DCGLs for the PBRF structures, are published in a new technical basis document, [PBRF 2012]. In what follows, effects of the revised gross activity DCGLs on the FSS of Miscellaneous Structures and Pads are evaluated.

The following topics are addressed: " The effect of revised DCGLs on the survey design calculation of the number of measurements, "N"." Instrument sensitivities and scan survey action levels relative to the revised DCGLs.* Evaluation of FSS measurement results against the revised DCGLs to ensure that the MSP survey units satisfy the 25 mrem/y criterion.'

The next section, Section 2.0, contains a summary of the revised gross activity DCGLs. In Section 3.0, results of VSP calculations performed to determine if the number of measurements, N, is changed as a result of the revised DCGLs are presented.

Section 4.0 summarizes the evaluation of instrument sensitivities and scan survey action levels to ensure that FSS Plan requirements for action levels relative to DCGLs for MSP Class 1 and Class 2 survey units are satisfied.

In Section 5.0, the FSS systematic total surface beta measurement results are evaluated to demonstrate that the MSP survey units meet the 25 mrem/y criterion, considering the revised DCGLs.1 In addition to those issues noted, the possibility exists that static investigative measurements may exceed a revised, reduced DCGL which did not exceed the original DCGL. In this eventuality, an Elevated Measurement Comparison (EMC) and Elevated Measurement Test (EMT) are required.

For the FSS of the MSP, no static investigative measurements were performed and no EMC and EMT are necessary.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix C, Rev. 0, Page 4 of 9 2.0 Revised DCGLs The revised DCGLs for the areas involving the MSP are shown in Table 1. The DCGL for the ATS Tunnel is increased from 35,296 to 40,500 dpm/100-cm 2 due to removal of U-234 from the mixture.The WEMS DCGL is essentially unchanged.

The DCGL for the remaining MSP survey units, the default DCGL, is changed from 27,166 to 23,146 dpm/100-cm 2 , a reduction of 14.8%.Table 1, Revised DCGLs for MSP TBD-07-001 Bldg. or Survey Table 5-3 LaRevised Structure Design Location DCGLGB DCGLGB % change (dpm/1 00-cm 2)ATS Tu 22 ATS Tunnel (& Rx Bldg. -15 ft. el.) 35296 40500 14.7%Tunnel WEMS 52 All Areas 33834 33673 -0.5%All MSP Areas Except ATS Tunnel &Other 50, 53,71,72 WEMS 27166 23146 -14.8%(default mixture & DCGL)3.0 Survey Design Calculations with Revised DCGLs To determine if the revised DCGLs would result in significant additional FSS measurements, the number of measurements was recalculated for each of the MSP survey designs. The revised DCGLs were input into VSP. The principal design parameters and the VSP input parameter values are shown in Table 2. The table lists the original design parameters for Designs 22, 50, 52 and 53. The design calculations for Designs 71 and 72 are not included in the table as they are identical to Design 53.The table rows immediately below the original design parameters show the design parameters associated with the revised DCGLs. Comparing the original and revised design parameter values, it is seen that the LBGR/DCGL ratio is preserved as is the value of a, except where a is assumed to be a fixed percentage of the DCGL (20%). The LBGR did change somewhat, because of the change in DCGL values, but the FSS Plan guidance to maintain the relative shift (A/a) between one and three was accomplished in all but Design 50 where the value of Ala changed from 4.4 to 3.5. Figures 1 through 4 in the Addendum are images of the VSP design output screens for the re-calculation of N.Screens from Designs 22, 50, 52 and 53 are shown. They show the values of a, the Type I error probability, 03, the Type II error probability (these are unchanged), A, the DCGL and a, the estimated standard deviation.

Table 1 shows that the calculated number of measurements for all the recalculated designs is unchanged (N= 11). This attests to the conservative assumptions used in the original design calculations.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix C, Rev. 0, Page 5 of 9 Table 2, MSP Survey Design Recalculation Summary Design Survey Units DCGLw LBGR LBGR N No. (1) (1) DCGLw MA-I-IthroughI-35,296 34,497 0.98 799 266 3.0 11 22 6, ATS Tunnel ATS Tunnel Revised (2) 36,450 35,721 0.98 729 266 2.7 11 MA-2-1 through 2-15, Cooling Tower 26,079 23,471 0.90 2,608 598 4.4 11 50 Basin Cooling Tower 20,831 18,748 0.90 2,083 598 3.5 11 Basin Revised (3)MA-4-1 through 4-9, 24,449 53 Sludge Basins Sludge Basins Revised (3)Table 2 Notes: 1. Units are dpm/100-cm 2.2. The revised DCGL from TBD-1 1-002 (40,500 dpm/100-cm

2) is reduced by 10% to account for the dose contribution for deselected radionuclides.

3. The revised default DCGL from TBD- 11-002 (23,146 dpm/I00-cm

2) is reduced by 10% to account for the dose contribution from deselected radionuclides.

4. The revised DCGL from TBD- 11-002 (33,673 dpm/I00l-cm

2) is reduced by 10% to account for the dose contribution from deselected radionuclides.

4.0 Instrument Sensitivities and Action Levels Sensitivities of instruments used in the FSS of the MSP are reviewed to ensure that they were sufficient to meet FSS Plan requirements in view of the revised DCGLs. As described in Section 4.1 of the main body of this report, the FSS Plan requirement for Class 1 survey units is that when an observed scan count rate is greater than a value equivalent to the DCGLEMC, an investigation is required.

For Class 2 survey units, an investigation is required whenever a scan count rate is observed that is greater than a value equivalent to the DCGLw. Alternatively, if the scan MDC is greater than the DCGLw, an observed scan count rate greater than the scan MDC requires an investigation.

In the original survey designs and instructions for Class 1 survey units, scan investigation levels were set below the DCGL. This provided a conservative margin below the requirement that the investigation level be set at the DCGLEMC. The investigation levels used in the FSS of the MSP are compared to DCGLEMC values associated with the revised DCGLs to determine if the FSS Plan Plum Brook Reactor Facility FSSR, Attachment 15 Appendix C, Rev. 0, Page 6 of 9 requirement is satisfied in retrospect.

Table 3 lists the revised DCGLEMC values for the designs where the revised DCGLs are decreased.

Table 3, Revised DCGLEMC Values for MSP Class 1 Survey Units Revised Revised Area ofArea DGLM Design Survey Units DCGLW Laof AEMC Factor 2 No. (dpm/100-cma) argest (i) (2) (3) (dpm!100-cm)

(1)SU (m) (4)22 MA-I-1 through 1-6, 36,450 99.1 9.0 2.2 80,190 (0)ATS Tunnel 50 MA-2-1 through 2-15, 20,831 100 9.1 2.2 45,828 Cooling Tower Basin 52 MA-3-1 through 3-7, 30,306 100 9.1 2.2 66,673 WEMS 53 MA-4-1 through 4-9, 20,831 91.9 8.4 2.2 45,828 Sludge Basins MA-5-1 through MA-5-71 6 Misc Pads (Class 1 20,831 108 9.8 2.2 45,828 MA-5-4)Table 3 Notes: 1. The DCGLs are reduced by 10% to account for deselected radionuclides.

2. Calculated as AEMC = 100/N where 100 m 2 is a conservative-representative value of the Class 1 MSP survey unit areas.3. The Area Factor for AEMC = 9.1 is 2.2. It is obtained by interpolation from FSS Plan Table 3-5, Building Reuse Area Factors (Structures).

4. The revised DCGLEMC is obtained as revised DCGL x 2.2.5. The revised DCGL for the ATS Tunnel is an increase in the original DCGL (35,296 dpm/100-cm 2), so evaluation of the scan investigation level relative to the revised DCGLEMC is not necessary.

It is noted that this is a retrospective evaluation and does not involve an increase in the investigation-action level that was actually used in the FSS of the ATS Tunnel.Next, the investigation levels established in survey design instructions for the instrument models used in the MSP FSS of Class 1 survey units are compared to the Revised DCGLEMCS.

Table 4 shows the LMI model 44-116 detector information.

The LMI 44-9 detector information is shown in Table 5. The tables show that in all cases instrument scan sensitivities are sufficient to meet the investigation level requirement for Class 1 areas; the detectors are capable of detecting contamination levels at or below the DCGLEMC for the revised DCGLs.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix C, Rev. 0, Page 7 of 9 Table 4, LMI 44-116 Detector Scan Sensitivity and Investigation Levels for Original and Revised DCGLs -Class 1 Areas SR Scan Scan count Scan count Scan count rate Investigation Investigation Design Scan MDC Investigation rate = DCGL rate = revised = revised Level < Level <No. Survey Units Level ) (2) DCGL (2) DCGLEMc (2) Revised Revised (dpm/100-cm

2) (gcpm) (ncpm) DCGL DCGLEMC 50 MA-2-1 through 2-5 & 2-15, 2587 3800 3885 2435 5357 No Yes Cooling Tower Basin 52 MA-3-1 through 3-7, WEMS 2587 3000 3559 3542 7758 Yes Yes 53 MA-4-1 through 4-9, Sludge 2587 2000 2858 2435 5357 Yes Yes Basins 71 MA-5-4, Misc Pads 2587 2858 2858 2435 5357 No Yes Table 4 Notes: 1. The investigation levels are from the Survey Instructions

-the scan investigation level for the 44-116 is in units of gcpm.2. Action levels corresponding to DCGLs are in ncpm. Typical 44-116 background count rates are 200 to 250 cpm.Table 5, LMI 44-9 Detector Scan Sensitivity and Investigation Levels for Original and Revised DCGLs -Class 1 Areas SR Scan Scan count Scan count Scan count rate Investigation Investigation Design Scan MDC Investigation rate = DCGL rate = revised = revised Level < Level <No. Survey Units Level (() (2) DCGL (2) DCGLEMC (2) Revised Revised (dpm/1 00-cm 2) (ncpm) DCGL DCGLEMc 50 MA-2-1 through 2-5 & 2-15, 9919 500 566 355 781 No Yes Cooling Tower Basin 52 MA-3-1 through 3-7, WEMS 9919 450 519 516 1136 Yes Yes MA-4-1 through 4-9, Sludge 10169 400 406 355 781 No Yes Basins 1 1641 463571 NY 71 MA-5-4, Misc Pads 11268 367 367 355 781 No Yes Table 1.2.5 Notes: The investigation levels are from the Survey Instructions

-the scan investigation level for the 44-9 is in units of ncpm.Action levels corresponding to DCGLs are in ncpm. Typical 44-9 background count rates are 75 to 100 cpm. When the 44-9 is used for scan surveys, an average background count rate is determined for the area.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix C, Rev. 0, Page 8 of 9 To evaluate the effect of revised-reduced DCGLs on the six Class 2 survey units in the FSS of the MSP, the scan survey data was reviewed to determine the measurement capabilities using the detection efficiencies of the detectors actually used in the surveys. Table 6 summarizes the results. It shows that in the actual surveys, scan sensitivities were well below the DCGL (the revised DCGL for these survey units is 20,831 dpm/l00-cm 2 , with adjustment for deselected radionuclides).

In these surveys, conservative action levels were used which corresponded to observed scan conditions; rough and fractured surfaces with detector-to-surface effective distance greater than the distance assumed under optimal conditions.

Also, in calculating the total surface activity equivalent to the action level, the detector background count rate is subtracted; this removes the measurement bias associated with normal practice in the FSS.Table 6, LMI 44-116 Action Levels and Scan Capabilities for Class 2 Survey Units Survey Action Level Detector Detector Efficiency Total Surface Activity Unit used in Survey Background Efficiency Correction Equivalent to Action Level (AL, gcpm) (') (bkg, cpm) (El) (2) Factor (Ec) (TSA, dpm/100-cm

2) (3)(3)MA-5-1 600 196 0.362 0.8349 2,673 MA-5-2 1700 212 0.302 0.6888 14,306 MA-5-3 600 232 0.349 0.6888 3,062 MA-5-5 600 210 0.362 0.3966 5,433 MA-6-6 600 210 0.362 0.3966 5,433 RS-1-1 1300 205 0.338 0.6888 9,407 Table 6 Notes: 1. Scan action levels applied by technicians to the survey.2. These are the actual efficiencies reported for the detectors used in the survey. A generic surface efficiency, E, = 0.5 is also applied.3. This is an additional efficiency correction factor used to account for the reduced efficiency due to the increased effective detector-to-surface distance.

An E, of 0.8349 corresponds to 0.5 in.distance; an E. of 0.688 corresponds to a distance of 1.0 in. and an E, of 0.3966 corresponds to 2.0 in.AL -bkg-4. The Total surface beta activity equivalent to the action level is calculated as: TSA -AL0.kE E, *0.5*Ec 5.0 Evaluation of FSS Results to Ensure the Dose Criterion is met Results of the systematic fixed survey measurements from each survey unit are reviewed to ensure that they satisfy the 25 mrem/y criterion, considering the revised DCGLs. To this end, the results of fixed measurements and tests, reported in Table 10 of the main body of this report are examined.Table 10 shows that the maximum individual measurement, 2,190 dpm/100-cm 2 (in survey unit MA-4-9, Sludge Basin) is well below the applicable revised DCGL, 20,831 dpm/lOO-cm 2.The maximum of the survey unit averages, 1,275 dpm/ 100-cm (also in survey unit MA-4-9) is also well below the revised DCGL.The ALARA evaluation in Section 5.5 of the main report is also reviewed to examine the effect of revised DCGLs. Table 12 in the main report shows the screening level DCGL values and the PBRF default radionuclide activity fractions used in the ALARA evaluation.

Replacing the Table 12 Plum Brook Reactor Facility FSSR, Attachment 15 Appendix C, Rev. 0, Page 9 of 9 activity fractions with the revised default activity fractions developed in the TBD- 11-002 results in a change in the screening level equivalent gross activity DCGL from 781 to 14,124 dpm/100-cm 2.The details of this calculation are shown in Addendum 2. This change is primarily due to the removal of U-234 and U-235 from the mixture. The average of the MSP systematic total surface beta activity measurements (679 +/- 324, with an upper 9 5 th % confidence limit of 708 dpm/100-cm

2) is well below the revised equivalent screening level DCGL. The conclusion that the ALARA requirement is satisfied is unchanged by the revised DCGLs.

Plum Brook Reactor Facility FSSR, Attachment 15 Appendix C Addendum 1, Rev. 0, Page 1 of 4 Addendum I -VSP Design Screens Figure 1, VSP Screen for Design 22, Survey Unit MA-I-1, ATS Tunnel Plum Brook Reactor Facility FSSR, Attachment 15 Appendix C Addendum 1, Rev. 0, Page 2 of 4 Figure 2, VSP Screen for Design 50, Survey Unit MA-2-1, Cooling Tower Basin Plum Brook Reactor Facility FSSR, Attachment 15 Appendix C Addendum 1, Rev. 0, Page 3 of 4 Figure 3, VSP Design Screen for Design 52, Survey Unit MA-3-1, WEMS Plum Brook Reactor Facility FSSR, Attachment 15 Appendix C Addendum 1, Rev. 0, Page 4 of 4 Figure 4, VSP Design Screen for Design 53, Survey Unit MA-4-1, Sludge Basins Plum Brook Reactor Facility FSSR, Attachment 15 Appendix C Addendum 2, Rev. 0, Page 1 of 1 Addendum 2 -Calculation of Revised Equivalent Screening Level DCGL for ALARA Evaluation The EXCEL template used to calculate screening level equivalent gross activity DCGLs for the ALARA evaluation described in Section 5.5 of the main body of this report is shown below. The individual radionuclide screening level DCGLs shown in the range B4:14 are the NRC screening level DCGLs shown in Table 12 of the main body of this report. The template uses the surrogate and gross beta activity DCGL equations from Section 3.6 of the PBRF FSS Plan. These equations are implemented in the cell formulas in the range L8:M9. Example cell formulas are shown for cells L8 and M8. The template calculates screening level equivalent DCGLs for the original and revised PBRF default radionuclide mixtures.A B C D E F G H I K L M 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Screening Level DCGLs (dpm/ 100-cm 2)H-3 Co-60 Sr-90 1-129 Cs-137 Eu-154 U-234 U-235 1.20E-+08 7,100 8.700 35,000 28,000 12.000 91 98 sc ng Screesng Activity Fractims Level Level Descipm Ac* ZXDCGL ., DCGLw Fractim H--3 Co-60 Sr-90 1-129 Cs-137 Eu-154 U-234 U-235 (dlpl1OO-cm2)

Defan Mixture 02707 0.0965 0.0788 0.0142 0.4671 0.0012 0.0698 0.0017 0.6436 583 781 Revised Def. &ix 0.265 0.178 0.078 0.013 0.465 0.0013 0.7221 27384 14124 Example Cell Formulas Cell J Formula Conieut KS j=(CSb+OF84G8)/SUM(B8:w)

Detectable Act* Fraction.B =1/((I1/$F$4)+((B8/F8)/$B$4)+((ES/F8)/$E$4)4((H8/FS)/$H$4)+((18/F8)/$1$4))

Swrogate DCGL Cakidation M =K/((FS/LS)+(S/C

)4+D8/$D$4)4-G8/$G$4))

Gross Act.

• DCGL Cakuhatn