Text

Final Status Survey Report, Attachment 3, Fan House Building, for the Plum Brook Reactor Facility
	ML102030280
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Site:	Plum Brook File:National Aeronautics and Space Administration icon.png
Issue date:	05/27/2010
From:	Peecook K; US National Aeronautics & Space Admin (NASA), John H. Glenn Research Ctr at Lewis Field
To:	; Document Control Desk, NRC/FSME
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i National Aeronautics and Space Administration John H. Glenn Research Center Lewis Field Plum Brook Station Sandusky, OH 44870 May 27, 2010 Reply to Attn of: QD U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, D.C. 20555

Subject:

Final Status Survey Report, Attachment 3, Fan House Building, for the Plum Brook Reactor Facility, Licenses Nos. TR-3, Docket No. 50-30 and R-93, Docket No, 50-185 Enclosed for your review is Attachment 3 to the Final Status Survey Report supporting eventual termination of the licenses for the Plum Brook Reactor Facility.,

The complete Final Status Survey Report will consist of a series of Attachments, each addressing an individual survey area or group of survey areas or environmental areas as described in our NRC approved Final Status Survey Plan. The final submission will be the main body of the Final Status Survey Report which will consolidate and summarize the details presented in the Attachments.

This Attachment addresses the Final Status Survey of the Fan House Building (Building 1132). It supports our conclusion that radiological remediation of the building has been completed and the structure meets the criteria for unrestricted release specified in 10 CFR 20.1402.

Should you have any questions or need additional information, please contact me a NASA Plum Brook Station, 6100 Columbus Avenue, Sandusky, Ohio 44870, or by telephone at (419) 621-3277.

Sincerely, Keith M. Peecook NASA Decommissioning Program Manager Enclosure Plum Brook Reactor Facility Final Status Survey Report, Attachment 3, Fan House, revision 0, dated May 26. 2010

cc:

USNRC/C. J. Glenn (FSME)

USNRC/J. Webb (FSME)

USNRC/J. Tapp RIII/DNMS/DB ODH/M. J. Rubadue

Plum Brook Reactor Facility Final Status Survey Report Revision 0 Fan House (Building 1132)

FINAL STATUS SURVEY REPORT ROUTING AND APPROVAL SHEET Document

Title:

Final Status Survey Report, Fan House (Building 1132)

Revision Number: 0 ROUTING SIGNATURE DATE Prepared By B. Mann S-oq-o Prepared By N/A REVIEW & CONCURRE/C Independent Technical Reviewer R. Case

//0 Other Reviewer, QA Manager J.Toa

)LI1-Other Reviewer FSS/Characterization Manager W. Stoner yt. /

NASA Project Radiation Safety Officer W. Stoner ii

NASA PBRF DECOMMISSIONING PROJECT,

A,,,

CHANGE/CANCELLATION RECORD DOCUMENT TITLE:

Final Status DOCUMENT NO: NA REVISION NO: 0 Survey Report, Attachment 3, Fan House (Building 1132)

Revision 0: Initial issue of Report SForm AD-0 1/3 Rev 1 iii

Plum Brook Reactor Facility FSSR, Rev. 0 LIST OF EFFECTIVE PAGES DOCUMENT NO:

NA

-REVISION NO: 0 Page No.

Revision Level Page No.

Revision Level Cover Page Routing & Approval Sheet Change/Cancellation 0

Record LOEP 0

TOC 0

List of Tables & List of Figures 0

List of Acronyms &

0 Symbols, 2 pages Text, 25 pages 0

Appendix A 0

23 pages Appendix B 0

40 pages I

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a IForm AD-OI1/5 Rev 2 iv

Plum Brook Reactor Facility FSSR, Rev. 0 TABLE OF CONTENTS 1.0 In tro d u ctio n....................................................................................................................

1 2.0 Fan House Description..............................................................................................

2 2.1 Building Construction..............................................................................................

2 2.2 Building Systems and Services................................................................................

4 2.3 Building M odifications............................................................................................

4 2.4 Final Configuration and Scope................................................................................

5 3.0 History of Operations.................................................................................................

5 3.1 Chronology...........................................................................................................

5 3.2 Startup and Operations............................................................................................

6 3.3 Radioactive M aterials in the Fan House..................................................................

6 3.4 Disposition of M aterials in the Post-Shutdown Period............................................

7 3.5 Decommissioning.....................................................................................................

9 4.0 Survey Design and Implementation for the Fan House..........................................

9 4.1 FSS Plan Requirements.........................................

9 4.2 Area Classification and Survey Unit Breakdown...................................................

11 4.3 Number of M easurements and Samples.................................................................

12 4.4 Instrumentation and M easurement Sensitivity........................................................

15 5.0 Fan House Survey Results........................................................................................

18 5.1 Surveys and Investigations....................................................................................

18 5.2 Fixed M easurements and Tests..............................................................................

20 5.3 ALARA Evaluation................................................................................................

21 5.4 Comparison with EPA Trigger Levels....................................................................

23 5.5 Conclusions............................................................................................................

23 6.0 References.....................................................................................................................

24 7.0 Appendices..................................................

25 Appendix A - Exhibits.....................................................................................................

25 Appendix B - Survey Unit Maps and Tables Showing Measurement Locations and Results 2 5 v

Plum Brook Reactor Facility FSSR, Rev. 0 LIST OF TABLES Table 1, Fan House Radionuclide Activity Fractions and Gross Activity DCGLs.................. 10 Table 2, Class-Based Survey Scan Coverage and Action Level Requirements.......................

10 Table 3, Fan H ouse Survey Units for FSS....................................................................................

11 Table 4, Fan House Survey Unit Breakdown by Major Elevation...........................................

12 Table 5, Fan House Survey Design Summary.........................................................................

14 Table 6, Sensitivity Analysis for Fan House FSS Design........................................................

15 Table 7, Typical Detection Sensitivities of Field Instruments.................................................

17 Table 8, Scan Survey R esults...................................................................................................

18 Table 9, Fan House Total Surface Beta Activity Measurement Summary and Test Results....... 20 Table 10, Screening Level Values for Fan House and Radionuclide Activity Fractions......

22 LIST OF FIGURES Figure 1, PBRF NW Area Showing Reactor Building, Fan House and Other Support Buildings. 3 vi

AEC ALARA AF bi BR BPL CR13 CFR CPT cm cm2 cpm A

d9 DCGL DCGLEMC DCGLw dpm Ei "E,

Et EMC EPA FH FSS FSSP FSSR 7

g HTD HL HPT HRA HVAC i

in.

LMI LBGR m2 MARSSlIM Plum Brook Reactor Facility FSSR, Rev. 0 LIST OF ACRONYMS & SYMBOLS alpha; denotes alpha radiation, also type I error probability in hypothesis testing Atomic Energy Commission As Low As Reasonable Achievable Area Factor beta; denotes beta radiation, also type 1I error probability in hypothesis testing background counts in observation interval Background count rate Byproduct License Cold Retention Basin Code of Federal Regulations Cold Pipe Tunnel centimeters square Centimeters counts per Minute delta, DCGLw - LGBR Scan surveyor sensitivity index Derived Concentration Guideline Level DCGL for small areas of elevated activity, used with the Elevated Measurement Comparison test (EMC)

DCGL for average concentrations over a survey unit, used with statistical tests.

(the "W" suffix denotes "Wilcoxon)"

disintegrations per minute Detector, or instrument efficiency Surface efficiency Total efficiency Elevated Measurement Comparison US Environmental Protection Agency Fan House, Building 1132 Final Status Survey Final Status Survey Plan Final Status Survey Report gamma gram Hard To Detect Hot Laboratory, Building 1112 Hot Pipe Tunnel Hot Retention Area Heating, ventilation and air conditioning observation counting interval during scan surveys inch Ludlum Measurements, Inc.

Lower Bound of the Gray Region square meters Multi-Agency Radiation Survey and Site Investigation Manual vii

Plum Brook Reactor Facility FSSR, Rev. 0 LIST OF ACRONYMS & SYMBOLS. Continued MDC Minimum Detectable Concentration MDCscan Minimum Detectable Concentration for scanning surveys MDCstatic Minimum Detectable Concentration for static surface activity measurements MDCR Minimum Detectable Count Rate mrem millirem MW Megawatt MWH Montgomery Watson Harza, Inc.

NASA National Aeronautics and Space Administration N

Number of FSS measurements or samples established in a survey design NA Not Applicable NRC US Nuclear Regulatory Commission OW Outside Walls PBRF Plum Brook Reactor Facility PNL Pacific Northwest Laboratory (D

Standard normal distribution function p

surveyor efficiency for scan surveys pCi/g picocuries per gram percent PPH Primary Pump House QC Quality Control RESRAD RESidual RADioactive - a pathway analysis computer code developed by Argonne National Laboratory for assessment of radiation doses. It is used to derive cleanup guideline values for soils contaminated with radioactive materials RESRAD-BUILD A companion code to RESRAD for evaluating indoor building contamination and developing site-specific DCGLs ROLB Reactor Office and Laboratory Building, Building 1141 s

seconds a

generic symbol for standard deviation of a population SAIC Science Applications International Corporation SNL Sandia National Laboratory SR Survey Request ts background count time tb sample count time TBD Technical Basis Document P

Mean activity concentration UCM Unusual Condition Measurement UL Upper limit of the confidence interval about the mean VSP Visual Sample Plan WEMS Water Effluent Monitoring System WHB Waste Handling Building Z-.*

Proportion of standard normal distribution values less than I-a ZI-0 Proportion of standard normal distribution values less than I-f3 o0 Mathematical symbol for infinity viii

Plum Brook Reactor Facility FSSR, Rev. 0 1.0 Introduction This report presents the results of the final status radiological survey of the Plum Brook Reactor Facility (PBRF) Fan House (Fl-I, Building 1132). It is Attachment 3 of the PBRF Final Status Survey Report (FSSR) 1. This attachment describes the Fan House, its operational history and final condition for the final status survey (FSS). It describes the methods used in the FSS and presents the results of the survey measurements.

As stated in the PBRF Final Status Survey Plan (FSSP) [NASA 2007], the goal of the decommissioning project is to release the facility for unrestricted use in compliance with the requirements of US NRC 10CFR20 Subpart E. The principal requirement is that the dose to future site occupants will be less than 25 mrem/y. Subpart E also requires that residual contamination be reduced to levels as low as reasonably achievable (ALARA). A Derived Concentration Guideline Level (DCGL) for residual surface contamination has been established for the Fan House.

Considering the radionuclide mixture established for the Fan House, the gross beta DCGL is 36,857 2

dpm/1 00-cm The survey measurement results and supporting information presented herein demonstrate that residual contamination levels in each survey unit of the Fan House are well below the DCGL.

Additionally, it is shown that residual contamination has been reduced to levels that are consistent with the ALARA requirement. Therefore, the Fan House meets the criteria for unrestricted release.

Section 2.0 of the report provides a description of the Fan House. This includes the building layout, its relation to other PBRF buildings and facilities, design and materials of construction, building contents and use, systems and services, building modifications, final configuration for the FSS and scope of the FSS for this building.

A brief history of operations is presented in Section 3.0. A chronology of significant milestones is followed by history of operations with radioactive materials. Post shutdown and decommissioning activities are summarized.

Section 4.0 presents the FSS design for the Fan House. This section includes applicable FSS Plan requirements, breakdown into survey units and assignment of MARSSIM classification to each, the survey design approach, and instrumentation used for the FSS and measurement sensitivities.

Survey results are presented in Section 5.0. This section includes a summary of the FSS measurements performed in the Fan House survey units, comparison to the DCGL, tests performed and an evaluation of residual contamination levels relative to the ALARA criterion.

Supporting information is contained in Appendices. Appendix A contains photos and schematics to supplement the text. Survey design maps, tables of coordinates and total surface beta measurement results for each survey unit are provided in Appendix B.

The PBRF Final Status Survey Report comprises the report main body and several attachments. The attachments present survey results for individual buildings and open land areas. The entire final report will provide the basis for requesting termination of NRC Licenses TR-3 and R-93 in accordance with 10CFR50.82 (b) (6).

1

Plum Brook Reactor Facility FSSR, Rev. 0 2.0 Fan House Description The Fan House (FH) is a two level, 6,400 ft2 (floor area) structure located about 40 meters southeast of the Reactor Building and 10 meters east of the Hot Laboratory (HL). The Fan House first floor elevation is at grade level, corresponding to Reactor Building 0 ft. elevation (625 ft. above mean sea level). The basement is at the -12 ft. elevation. The Fan House is shown on the PBRF site map in Figure 1. Views of the Fan House exterior are shown in Exhibits I and 2 in, Appendix A.

Primary Fan House functions were collection and processing of exhaust air and contaminated water from the Reactor Building and other PBRF buildings. Air processing equipment contained in the FH included fans, pumps, compressors, a scrubber, filters, activated carbon absorbers, radiation monitor and exhaust system. The FH received air from the Reactor Building, the Reactor containment structure, reactor experiments, Hot Laboratory (HL), Reactor Office and Laboratory Building (ROLB) basement, Primary Pump House (PPH), Waste Handling Building WHB), Hot Retention Area (HRA) and the Hot Pipe Tunnel (HPT). The incoming air was filtered, monitored, compressed and stored for decay as required, then exhausted through the monitored PBRF Stack located adjacent to the east side of the FH.

All radioactively contaminated water from PBRF was processed in the Fan House. This included the reactor primary coolant system, the HRA, Cold Retention Basins (CRBs), cooling water systems, the Quadrant and Canal systems, hot sumps and contaminated laundry. Processed waste water was either recycled or stored for decay, but was eventually disposed of as effluent waste water through the Waste Effluent Monitoring System (WEMS).

2.1 Building Construction The Fan House building was constructed of steel framing with poured concrete floors and basement walls. The exterior walls were constructed of fluted steel exterior siding on the first floor level. The first floor contained a 2-foot thick concrete shielded room in the southwest corner that housed the wastewater cleanup system deionizers. The shield walls formed part of the building exterior on the south and west sides of the building. The first floor included a large open equipment area that housed ventilation fans, acid and caustic tanks, air compressors (including two for the bottle monitoring system) and instrument panels. In addition, the first floor contained an office area, a rest room, and janitor's closet. The area of the 1st floor is approximately 3100 sq. ft.

The basement contained a one-foot thick concrete shielded room in the southwest comer that contained wastewater cleanup system filters, deionizer resin drains and a resin sump (hot sump). A large open area housed air system filters, cold sump, sanitary sewer sump and above-floor laundry sump tank. A separate room in the southeast side contained four air-monitoring tanks. In addition to direct basement access, the air-monitoring tank room was accessible from outside of the building through 7 removable concrete slabs that made up the ceiling. The slabs were 14" thick covered by an asphalt mat topping to prevent water in-leakage.

A valve pit (35 ft2.) was located outside of the building, on the northeast corner. This was for piping associated with the waste air system discharge to the stack. The valve pit was accessed 2.

Plum Brook Reactor Facility FSSR, Rev. 0 via a 2 x 2 ft. hatch. A stairwell on the east side provided access to the basement from the first floor. Total basement floor area is approximately 3300 ft2. An electrical pit was located outside the building, on the north side. Power to the building was provided from PBRF Unit Substation 4. Large acid and caustic storage tanks were located outside the FH building on the west side.

The major portion of the FH roof was constructed of steel decking covered with a composite roof consisting of a vapor barrier, 1 in. insulation, tar-paper, tar and gravel. The roof section located above the de-ionizer room in the southwest comer of the FH was constructed of approximately 2 feet of concrete with three removable plugs. There were 11 penetrations through the roof for vents, exhaust fans and roof drains.

Prior to completion of the Waste Handling Building (WHB) in 1964, exterior access to the FH consisted of a roll-up truck door on the north side and a personnel door on the north and east side. After construction of the WHB, the FH could be accessed from the WHB on the south side, Ist floor, via a personnel corridor and in the basement via an access tunnel. The FH was also connected directly to the HPT at the -15 foot level.

Figure 1, PBRF NW Area Showing Reactor Building, Fan House and Other Support Buildings 3

Plum Brook Reactor Facility FSSR, Rev. 0 2.2 Building Systems and Services Process systems located in the Fan House included:

fourteen contaminated ventilating and process air systems originating in the Reactor Building, Reactor Tank, Containment Vessel, experiment facilities, Hot Laboratory (work areas and hot cells), Waste Handling Building, Hot Pipe Tunnel, Primary Pump House, Hot retention area and the Fan House, including roughing and absolute (HEPA) filtration and four air monitoring storage tanks, a waste water cleanup system, including two deionizers, associated acid and caustic regeneration system and filters, that removed radioactive and other contaminants from the Quadrant and Canal water systems and Hot and Cold Retention Area water, a contaminated laundry system (washer, tumbler-dryer and extractor) for processing protective clothing, until this activity was transferred to the waste handling building in the 1963-1964 time frame,

the Fan House waste resin sump and waste resin storage pits,

cold sump, laundry sump and sewage sump,

service air compressor and two compressors associated with the air tank monitoring system and

" instrumentation and controls for the Cold Retention Basins and Hot Retention Area systems, the Hot Laboratory Off-Gas cleanup system, and an air storage tank monitoring system for the reactor tank and containment vessel ventilation systems (the stack effluent monitoring system).

Piping systems connected to the FH from the HPT interior, the external HRA pipe tunnel and underground connections from the PPH, CRBs and the HRA. These included piping from waste water cleanup resin pits, storm drain and sewage systems, domestic water system, ventilation system piping to the stack and the natural gas valve pit located NE of the Fan House.

2.3 Building Modifications Modifications were made to the Fan House after initial construction. These included removal of the contaminated laundry equipment when this function was transferred to the WHB in 1964. Other modifications included addition of instrumentation and controls for various Fan House processing systems and other improvements to the air and water cleanup systems. The air handling system was expanded to include WHB exhaust air processing. The Fan House Roof was repaired and upgraded in 1986 and again in 1998.

4

Plum Brook Reactor Facility FSSR, Rev. 0 2.4 Final Configuration and Scope Configuration of the Fan House for the FSS and the period until license termination is controlled by PBRF decommissioning and FSS procedures. For the FSS, the structure was intact with utilities and services limited to temporary lighting. All equipment was removed except for the cold sump in the basement which was maintained to control water in-leakage.

Electrical conduit, drains, HVAC ducts, hood ventilation ducts and plumbing fixtures were removed. All piping was drained and removed and sumps deactivated, except the cold sump as noted above. Exhibits 5 through 16 of Appendix A, show the condition and configuration of the principal rooms and areas in the Fan House at the time of the Final Status Survey.

The scope of FSS results reported in this attachment includes building interior surfaces and exterior concrete surfaces. It includes surface attachments, temporary safety covers and small embedded fixtures, for example pipe and conduit stubs such as shown in Exhibits 17 and 18 of Attachment A. The FSS includes the valve pit attached to the east side of the building. It does not include piping embedded in Fan House concrete or piping buried beneath or adjacent to the building. These results are reported in a separate attachment to the FSS Report (Plum Brook Reactor Facility Final Status Survey Report, Attachment 9).

Also, the Fan House FSS does not include the roof and exterior steel siding. After completion of the FSS measurements, the roof, steel siding, above grade structure and the Fan House stack foundation were removed. This material has been segregated for "free release" survey under PBRF radiological control procedures. Views of the Fan House demolition in May 2010 are shown in Exhibits 19 and 20, Appendix A. The stockpiled material is shown in Exhibit 21 of Appendix A.

3.0 History of Operations A chronology of Fan house milestones is given below. This is followed by a discussion of building operations, post-shutdown and decommissioning activities. Emphasis is on operations with radioactive materials that could affect the final building condition and final status survey.2 3.1 Chronology Major Fan House milestones are listed below:

1956 - September, groundbreaking for PBRF.

1958 - Fan House construction initiated.

2 Information sources for the history and pre-decommissioning period include, construction photos, construction drawings, PBRF operating cycle reports, Radiochemistry periodic reports, PBRF Annual Reports, Unusual Occurrence Files, memoranda and other historical files maintained by PBRF Document Control.

5

Plum Brook Reactor Facility FSSR, Rev. 0 1959 - Fan House structure completed.3 1961 - June, 60 MW Test Reactor critical.

1973-January 5 th, Reactor shutdown.

1973 - June 30, Fan House placed in "standby condition 1985 - Initial radiological characterization, Teledyne Isotopes Inc.

1989 - Follow-up radiological characterization, GTS-Duratek.

2002 - Decommissioning Plan approved. Equipment removal and initial building decontamination.

2006-2007 - Remediation of contaminated areas and preparation for FSS.

2009 - FSS measurements completed.

2010 - Structure demolished to 3 ft. below grade.

3.2 Startup and Operations Fan House startup occurred in the 1959-1960 time period. During that time, installation of the process systems was completed and the systems underwent startup and testing. Pumps and fans were tested under operational conditions to ensure they would perform to specifications.

After startup and testing, Fan House systems were operated as needed for reactor low power testing, approach to power and power operations.

The Fan House was not normally manned continuously; a roving operator/mechanic oversaw operations and maintenance of the principal reactor support systems, i.e., the HRA, contaminated air system, the off-gas system and the waste cleanup system. Laundry services in the Fan House were, however, manned continuously for several years, until they were transferred to the WHB.

3.3 Radioactive Materials in the Fan House The US Atomic Energy Commission (AEC) authorized operations and use of radioactive materials at the PBRF under several licenses. 4 License No.TR-3 (Docket 50-30) authorized the 60 MW test reactor. The 100 KW mock-up reactor was licensed under License No.R-93.

A broad byproduct license (BPL) No. 34-06706-03, authorized possession and use of 3 Construction photos show that Fan House construction was initiated in 1958 and the structure completed in 1959

[PBRF 2009].

4 Authority for the PBRF reactor and radioactive materials licenses was assumed by the US Nuclear Regulatory Commission in 1975.

6

Plum Brook Reactor Facility FSSR, Rev. 0 radioactive materials (byproduct material) produced by the Plum Brook 60MW and Mockup reactors and other radioactive materials. Radioactive materials in the Fan House were primarily those contained in process systems and wastes in sumps, resins, filter media, etc.

Although radioactive materials entered Fan House systems from various locations around the site, such as the Primary Pump House, Hot Laboratory and Reactor Building, they were produced in the 60MW test reactor and the mock-up reactor. Radionuclides encountered during Fan House operations included activation products such as Ar-41 and Co-60 and the fission products: tritium, Kr-85, Rb-88, 1-131, 1-132, Xe-135, Cs-137, Ta-182, and W-187

[PBRF 2009]. 5 During operations, activities within PBRF facilities involving radioactive materials were well documented in PBRF cycle reports, radiochemistry periodic and special reports, PBRF annual reports, and experiment results reports. On several occasions, incidents involving loss of control of radioactive materials in the Fan House were reported. These were recorded in Operations Cycle reports. Operations Cycle Reports involving the Fan House are summarized:

Cycle 45 - April 1966. The janitor's closet sink was found contaminated with radioactive material. The sink was decontaminated. The sink drain connected to the station sewage system that was an unmonitored pathway to a small off-site sewage treatment plant. The contamination levels were low.

" Cycle 61 - May 1967. The basement floor was contaminated during a routine air filter change on the filter housing for the Hot Laboratory Cells 1 and 2 ventilation system.

Floor contamination ranged to 50,000 dpm/1 00-cm2. The area was decontaminated.

Cycle 74 - January 1968. The basement floor was flooded when the Hot Laboratory sump, located in the east end of the Hot Pipe Tunnel, overflowed. The sump water level forced water into and out of the fan house floor drains. The area was decontaminated.

" Cycle 87 - February 1969. During absolute air filter removal from the Hot Cell 1 and 2 ventilation system, a contact reading of 1 rem/hr was recorded.

3.4 Disposition of Materials in the Post-Shutdown Period Following the period between termination of reactor operations in January 1973 and June 3 0th of 1973, FH and other PBRF services were placed in standby status. The PBRF end condition statements governed the status of each system for the protected safe shutdown mode. All filters (air and water) were removed from housings and the deionizer resins from the 5 Tritium, Kr-85 and Rb-88 are also produced by thermal neutron activation, but generally in lesser quantities. than from fission.

6 Excerpted from a compilation of Fan House operations history prepared by PBRF retirees [PBRF 2009].

7

Plum Brook Reactor Facility FSSR, Rev. 0 deionizers and resin pits. All water systems were drained and all air systems depressurized and drained. Air filters were reinstalled and were routinely checked during the standby period.

All process piping, tanks and pumps were cleaned and drained. Electric power to pump motors was disconnected. The drain line to the FH hot sump was plugged; the hot sump was deactivated, cleaned and flushed and left dry and sealed.

The Fan House was given an initial housekeeping cleanup; remaining contaminated areas were identified and posted. The Fan House was left in "white zone" radiological status except for the HPT, Waste Water Treatment Room and most of the basement area that could not be decontaminated. 7 The gated entrance to the Hot Pipe Tunnel was locked and posted. The cold sump was left operational. General building areas were cleared of miscellaneous equipment, waste, other materials and supplies. The restroom was taken out of service. Water fountains were deactivated and drained. The building was closed and locked The radiological status of the FH has been investigated on multiple occasions since the PBRF was shutdown in January 1973. The first of these evaluations was performed by Teledyne Isotopes, Inc. during 1984-86. The results were reported in a 1987 Report [TELE 1987]. A survey was performed by GTS-Duratek in 1998 [GTS 1998] and characterization surveys were performed by Montgomery Watson in the 2003 - 2005 time frame.

These surveys showed similar results. Detectable surface contamination was limited in extent and confined to a few localized areas on the building interior floors and walls. The Teledyne Isotopes Study reported up to 12,000 net cpm total surface beta activity (roughly equivalent to 60,000 dpm/1 00-cm 2) in two locations in the -12 ft. elevation (one on the floor and one on a wall). The average total surface activity from 478 measurements in the main floor and basement elevations was 350 net cpm or about 1750 dpm/100-cm 2 (the detector was not identified, but an efficiency of 20% is assumed).

The GTS-Duratek survey of the FH included 124 total surface beta activity measurements throughout the 0 ft. and -12 ft. elevations. The average of these measurements was 2700 dpm/100-cm 2. Five measurements above 10,000 dpm/1 00-cm2, three above 20,000 dpm/100-cm2 and a maximum of 23,200 dpm/100-cm2 were reported.

The Teledyne Isotopes Study reported the results of 103 smear samples collected throughout the FH. No detectable removable surface alpha activity and very little removable surface beta activity were reported. The average of the removable surface beta activity measurements was 1 I dpm/1 00-cm 2 with a maximum of 102 dpm/1 00-cm 2.

The average total surface alpha activity reported in the Teledyne Study was 6 cpm/detector area (detector was not specified) and the average total surface alpha activity was < 1 2

dpm/100-cm.

The GTS-Duratek survey included 60 smear samples taken throughout the FH and these were counted for alpha and beta activity. The majority of the alpha counts were < MDA with a 2

maximum reported activity of 6 dpm/100-cm. Of the beta measurements, 37 were reported >

MDA with a maximum of 123 dpm/100-cm2.

7 White Zone surface contamination levels were defined in PBRF Radiological Control Procedures as "not greater than two times instrument background" [PBRF 1972].

8

Plum Brook Reactor Facility FSSR, Rev. 0 Isotopic analysis was performed on samples of FH Equipment residue in the Teledyne Isotopes study. Liquid from the FH Resin Pit showed the presence of Sr-90 (33 pCi/l ) and Cs-137 (90 pCi/1). Sediment (silt) from the base of the FH Exhaust Stack contained Co-60 (12,000 pCi/g).

Isotopic analysis of samples of concrete and smears from the FH and other PBRF structures was performed by Montgomery-Watson in 2005 [MWH, 2005]. These results were used to obtain the radionuclide mixture for development of the gross activity DCGL for the FSS as reported in TBD-07-001 [NASA 2007]. The radionuclide composition used to establish the FH DCGL is: H-3 (77.7%), U-234 (16.7%) and Cs-137 (5.6%).

3.5 Decommissioning All the process equipment and exposed piping and ductwork have been removed from the FH.

Equipment pads and sumps remain. All exposed surfaces have been surface-cleaned and decontaminated. The floors have been decontaminated by shaving/scabbling to a depth of 1/8 to 1/4 inch. Walls and other surfaces have been cleaned by sponge/grit blasting.

Radiological surveys were performed in support of Fan House D&D. The objective of the final post-remediation survey was to ensure that the Fan House could satisfy the release criteria with a high probability of success. Surveys were performed in 2006 and 2008 by MOTA and Science Applications International Corporation (SAIC), respectively in support of remediation and preparation for FSS. 8 4.0 Survey Design and Implementation for the Fan House This section describes the method for determination of the number of fixed measurements and samples for the FSS of the Fan House. Applicable requirements of the FSS Plan are summarized.

These include the DCGLW9, the gross activity DCGL, scan survey coverage and action-investigation levels, classification of areas and breakdown of the survey units. The radiological instrumentation and their detection. sensitivities are discussed.

4.1 FSS Plan Requirements The DCGLs for individual radionuclides were obtained for PBRF structures considering exposure to future site occupants from two potential pathways. Single radionuclide DCGLs were calculated using RESRAD-BUILD Version 3.22 for a building reuse scenario. Single radionuclide volumetric DCGLs were calculated for subsurface structures using RESRAD Version 6.21 for a resident farmer scenario. 10 The volumetric DCGLs (in pCi/g) were converted to "effective surface" DCGLs (in dpm/100-cm 2) using surface-to-volume ratios for Survey Requests, SR-28, 2006 and SR-74, 2008.

9 The convention used in the MARSSIM is to identify the DCGL used as the benchmark for evaluating survey unit measurement results, as the DCGLw. The "W" subscript denotes "Wilcoxon", regardless of the particular test used (Wilcoxon Rank Sum Test, or Sign Test).

10 Potential exposure to future occupants from subsurface structures could occur from contaminated concrete rubble placed as fill and from contaminated intact structures such as the below-grade portion of the Reactor Bioshield.

9

Plum Brook Reactor Facility FSSR, Rev. 0 the assumed volume of contaminated subsurface concrete. The DCGL calculations are described in the FSSP, Attachment B. To obtain the DCGLs for PBRF structures, the smaller of the two DCGLs calculated for each of the radionuclides of concern were selected.

For structural surfaces in the PBRF, where multiple radionuclides are potentially present in residual contamination, the DCGL for FSS design and implementation is a gross activity DCGL. The gross activity DCGL accounts for the presence of multiple radionuclides, including beta-gamma and alpha emitters. The gross activity DCGL can also include so-called hard-to-detect (HTD) radionuclides. The latter are not detected, or detected with very low efficiency, by the beta detectors selected for the FSS of structures.

The gross activity DCGL for the Fan House is calculated using equations in the FSSP for gross beta, gross alpha and surrogate DCGLs, based on the radionuclide mixture in residual contamination. Activity fractions and the gross activity DCGL for the Fan House are shown in Table 1. As shown in the table, the Fan House DCGLw is 36,857 dpm/100-cm2.

Table 1, Fan House Radionuclide Activity Fractions and Gross Activity DCGLs Radionuclides DCGLw Location H-3 Co-60 Sr-90 1-129 Cs-137 Eu-154 U-234 U-235 (dpmC100-Activity Fractions Assigned to Fan House ( v cm2)

Interior 0.777 0

0 0

0.056 0

0.167 0

36,857 Surfaces Exterior 0.271 0.966 0.079 0.142 0.467 0.001 0.070 0.002 27,166 Concrete Walls (2)

Table 1 Notes:

1. Activity profiles and gross activity DCGLs for structures are reported in the Technical Basis Document PBRF-TBD-07-001 [PBRF 2007].

2.

The PBRF default radionuclide mixture for structures and the associated DCGLw, 27,166 dpm/100-cm 2, is described in the Technical Basis Document, PBRF-TBD-07001 [PBRF 2007]. As discussed in Section 4.3, the default DCGLw was assigned to the Fan House exterior concrete walls in Design No.

29A.

Survey designs incorporate requirements for scan coverage and investigation levels derived from the MARSSIM classification of survey units. The values applicable to the Fan House are shown in Table 2.

Table 2, Class-Based Survey Scan Coverage and Action Level Requirements Classification Scan Survey Scan Investigation Static Measurement or Sample Coverage Levels Result Investigation Levels Class 1 100%

>DCGLEMC

>DCGLEMc Class 2

>DCGLw or >MDCcan

>DCGLw Clas210 to 100%

if MDCsca, is >DCGLw Class 3 Minimum of 10%

>DCGLw or >MDCsca,,

>50% of the DCGLw C__ass_3 Minimum__of_10%_if MDCScan is >DCGLw 10

Plum Brook Reactor Facility FSSR, Rev. 0 4.2 Area Classification and Survey Unit Breakdown The Fan House was divided into 13 areas and these were assigned initial MARSSIM classifications in the FSS Plan. This breakdown is shown in Table 2-1 of the FSS Plan. As part of the FSS implementation process, individual survey units are identified and their final MARSSIM classification established. The Fan House was divided into 38 survey units for the FSS. Table 3 lists the individual survey units and their classification for the FSS. The table compares final classification of the survey units with FSS Plan Table 2-1 classifications.

Table 3 was reviewed to ensure that no areas were classified "downward" from classifications assigned in the FSS Plan. Table 4 summarizes the survey unit breakdown by major elevation. 11 Table 3, Fan House Survey Units for FSS Survey Unit FSSP Classification

) Class Description (2)

FH-1-1 I

Ist Floor - Floor Section 1 1

FH-1-2 1

1st Floor - Floor Section 2 1

FH-1-3 1

1" Floor - Floor Section 3 1

FH-1-4 I

I"t Floor - Floor Section 4 1

FH-1-5 1

1st Floor - Floor Section 5 1

FH-1-6 1

1st Floor - Wall Section 1 1

FH-1-7 1

I"t Floor - Wall Section 2 1

FH-1-8 1

1St Floor - Wall Section 3 1

FH-1-9 1

I" Floor - Wall Section 4 1

FH-I-10 I

It Floor - Wall Section 5 1

FH-1-11 1

I't Floor - Wall Section 6 1

FH-1-12 I

1t Floor - Ceiling Section 1 1

FH-1-13 I

I t Floor-Ceiling Section 2 1

FH-1-14 1

1t Floor - Ceiling Section 3 1

FH-1-15 1

1It Floor - Ceiling Section 4 1

FH-1-16 1

1t Floor - Steel - columns I

FH-1-17 1

I't Floor - Steel - wall steel I

FH-1-18 1

1st Floor - Steel - roof steel section 1 1

FH-1-19 1

1t Floor - Steel - roof steel section 2 1

FH-1-20 1

1st Floor - Steel - roof steel section 3 1

FH-2-1 I

Basement - Floor - Section 1 1

FH-2-2 I

Basement - Floor - Section 2 1

FH-2-3 I

Basement - Floor - Section 3 1

FH-2-4 1

Basement - Floor - Section 4 1

The calculations performed in preparation of this report are documented in a memorandum to the PBRF Decommissioning Project File [PBRF 2010].

11

Plum Brook Reactor Facility FSSR, Rev. 0 Table 3, Fan House Survey Units for FSS - Continued Survey Unit FSSP Classification (1)

Class Description (2)

FH-2-5 I

Basement - Floor - Section 5 1

FH-2-6 I

Basement - Floor - Stairs & Valve Pit I

FH-2-7 1

Basement - Walls - Section 1 1

FH-2-8 1

Basement - Walls - Section 2 1

FH-2-9 1

Basement - Walls - Section 3 1

FH-210 1

Basement - Walls - Stairway & Air Monitor Room FH-2-11 1

Basement - Walls - Sump Room I

FH-2-12 I

Basement - Ceiling - Section 1 1

FH-2-13 I

Basement - Ceiling - Section 2 1

FH-2-14 I

Basement - Ceiling - Section 3 1

FH-2-15 1

Basement - Ceiling - Section 4 1

FH-2-16 I

Basement - Steel - Section 1 1

FH-2-17 1

Basement - Steel - Section 2 1

FH-4-1 3) 1 Exterior South and West Concrete 2

I Walls Table 3 Notes:

1.

The FSSP Table 2-1 identified 13 Fan House survey areas. For the FSS, these were divided into 38 survey units to meet the FSS Plan classification-based size limits.

2.

The FSS Plan classifications were based on area history and available characterization data.

3.

Denotes an area whose classification was changed from that listed in the FSSP Table 2-1.

Table 4, Fan House Survey Unit Breakdown by Major Elevation Major No. of Surface

% of Survey

% of Surface Elevation Survey Units Area (M 2)

Units Area First 20 1547.8 53 53 Basement 17 1296.6 45 45 OW 1

50.6 3

2 Total 38 2895.0 100 100 Table 4 Note:

1. OW - outside walls.

4.3 Number of Measurements and Samples The number of measurements and samples for each survey unit was determined using the MARSSIM statistical hypothesis testing framework as outlined in the FSS Plan. The Sign Test is selected because background count rates of instruments to be used are equivalent to a 12

Plum Brook Reactor Facility FSSR, Rev. 0 small fraction of the applicable DCGLw. 12 Decision error probabilities for the Sign Test are set at a = 0.05 (Type I error) and f3 = 0.10 (Type II error) in accordance with the FSSP.

The Visual Sample Plan (VSP) software was used to determine the number of FSS measurements in the Fan House. 13 When the Sign Test is selected, the VSP software uses MARSSIM Equation 5-2 to calculate the number of measurements. Equation 5.2 is shown below:

N = 1.2 (Za

+ Z,_

)2 N

[,)

1.2

-0.5s]2 (Equation 1)

Where:

1.2 = adjustment factor to add 20% to the calculated number of samples, per a MARSSIM requirement to provide a margin for measurement sufficiency, N = Number of measurements or samples, a = the type I error probability,

the type II error probability, ZI-, = proportion of standard normal distribution < I - a (1.6449 for a

0.05),

Zi- = proportion of standard normal distribution < 1 - P3 (1.2816 for f3 = 0.1),

(D (A/a) - value of cumulative standard normal distribution over the interval -

00 A/Y, A = the "relative shift", defined as the DCGL - the Lower Bound of the Gray Region (LGBR), and a = the standard deviation of residual contamination in the area to be surveyed (or a similar area). This may include the variation in measured "ambient" background plus the material background (for total surface beta measurements).

The MARSSIM module of VSP requires user inputs for the following parameters: a, j3, LGBR, the DCGLw and a. The number of measurements were calculated for the 38 Fan House survey units using the parameters established in two survey designs. Table 5 summarizes the Fan House survey design calculations and lists the values of the key VSP input parameters.

12 Background count rates for the LMI 44-116 detector, the instrument of choice for FSS surface beta activity measurements on structures, are in the range of 300 cpm or less for most materials. This is equivalent to about 2500 dpm/100-cm 2; less than 10% of PBRF structure DCGLs (this assumes a detection efficiency of-12%).

13 The FSS Plan (Section 5.2.4) states that a qualified software product, such as Visual Sample PlanC [PNL 20 10], may be used in the survey design process.

13

Plum Brook Reactor Facility FSSR, Rev. 0 Table 5, Fan House Survey Design Summary Design DCGL 2

No. (1)

Survey Units Class (2)

LGBR (2)

A (2)

G A/a N

FR--I-through 4-1 23 (interior surfaces) 1 35,383(3) 33,780 1,603 534.5(5) 3.0 11

9A FH-4-1 (exterior 1

24,449(4) 21,722 2,727 909(6) 3.0 11 Table 5 Notes:

1. The data reported in this table is taken from the Survey Design reports listed. They are maintained in the PBRF Document Control System.

2. Units are dpm/100-cm 2.

3. In Fan House structures, the DCGLw for the survey design, 35,383 dpm/100-cm 2, was obtained by adjusting the Fan House DCGL of 36,856 dpm!100-cm 2, by a factor of 24/25 to account for the allocation of 1 mrem/y to embedded piping associated with two Fan House survey units.

4.

In the survey design for the Fan House exterior concrete walls, the DCGLw for the survey design, 24,449 dpm/100-cm2, was obtained by adjusting the default value, 27,166 dpm/100-cm 2, by a factor of 10%

(22.5/25) to account for deselected "insignificant" radionuclides.

5. The estimate of a for interior surfaces was obtained from a Fan House post-remediation and variability survey (SR-28) and MWH characterization survey material background study (G9000 401B 1) measurements collected with LMI 44-116 beta detectors.

6. The estimate of a was obtained from Waste Handling Building post-remediation surveys (FH-4-1 was part of a Design 29A, a design package for the Waste Handling Building). Data from the MWH characterization survey material background study (G9000 401 B 1) was also used to obtain the material background component of measurement variability.

Selection of design input parameters followed guidance in the FSS Plan. The Plan states that "the LGBR is initially set at 0.5 times the DCGLw, but may be adjusted to obtain a value for the relative shift (A/a) between 1 and 3." It is seen in Table 5 that a relative shift value of 3.0 was used in the final calculations for determining N.

The VSP software automatically performs an analysis to examine the sensitivity of N, the number of samples, to critical input parameter values. The following is an example obtained from the VSP report for survey unit FH-2-3 of Design No. 23. The sensitivity of N was explored by varying the following parameters: standard deviation, lower bound of gray region (as % of DCGL), beta, probability of mistakenly concluding that the survey unit mean concentration, p, is greater than the DCGL and alpha, probability of mistakenly concluding that the survey unit mean concentration, p, is less than the DCGL. Table 6 summarizes this analysis. The region of critical sensitivity is for a = 0.05 (required to be fixed), 13

= 0.10 (may be adjusted) and the LBGR set equal to 90% of the DCGL. In this region, N is not sensitive to an increase of 100% in the value of a. The sensitivity of N to an incorrect conclusion that the survey unit will pass (regulator's risk) is quite low; increasing a from 0.05 to 0.10 and 0.15 shows that the number of measurements is 11 or fewer in all cases. These results show that N

= 11 represents a conservative design.

14

Plum Brook Reactor Facility FSSR, Rev. 0 Table 6, Sensitivity Analysis for Fan House FSS Design Number of Samples DCGL=35,383 a a=0.05 (2) a70.10 a=0.15 a=_1,069 (1 (37 a=534.5 a=1,069 o=534.5 a=1,069 a=534.5 LBGR=90% ()(4)

P3=0.05 14 14 11 11 10 10 P3=0.10 11 11 9

9 8

8 P3=0.15 10 10 8

8 6

6 LBGR=80%

P3=0.05 14 14 11 11 10 10 P3=0.10 11 11 9

9 8

8 P=0.15 10 10 8

8 6

6 LBGR=70%

P3=0.05 14 14 11 11 10 10 P3=0.10 11 11 9

9 8

8

[3=0.15 10 10 8

8 6

6 Table 6 Notes:

1. Units of DCGL, a and LBGR are dpm/100-cm2.

2.

a = alpha, probability of mistakenly concluding that p < DCGL.

3.

Y = Standard Deviation.

4.

LBGR = Lower Bound of Gray Region (as % of DCGL)

5. 13

= beta, probability of mistakenly concluding that p > DCGL Visual Sample Plan was also used to determine the grid size, the random starting location coordinates (for Class I and 2 survey units) and to display the measurement locations on survey unit maps drawn to scale. Refer to Appendix B for location coordinate tables and scale VSP maps showing measurement locations for each Fan House survey unit.

The survey designs also specify scan survey coverage and action levels based on the MARSSIM classification listed in Table 2. If the scan sensitivity of the detectors used in Class 1 survey units is below the DCGLw, the number of measurements in each survey unit is determined solely by the Sign Test. If the scan sensitivity is not below the DCGLW, the number of measurements is increased as determined by the Elevated Measurement Comparison (EMC). As discussed in the next section, the scan sensitivities of instruments used in the FSS of the Fan House are below the DCGLw, and no increase in the number of measurements above the value calculated using the Sign Test was required.

4.4 Instrumentation and Measurement Sensitivity Instruments to be used in the FSS of each survey unit are selected in each survey design.

Their detection sensitivities must be sufficient to meet the required action levels for the MARSSIM class of each survey unit. Minimum detection sensitivities for static alpha and beta measurements are calculated using the following equation:

It 3+3.29 BRt,(I+- t)

MDCstatic =

A (Equation 2) t lEot 100 15

Plum Brook Reactor Facility FSSR, Rev. 0 where:

MDCstatic = Minimum Detectable Concentration (dpm/100-cm 2),

BR = Background Count Rate (cpm),

tb = Background Count Time (min),

t, = Sample Count Time (min),

A = Detector Open Area (cm 2) and Et., = Total Detection Efficiency (counts per disintegration). The total efficiency equals the product of Detector Efficiency, EB and Surface Efficiency, E,.

Scan sensitivities for detectors which measure alpha and beta surface activity are determined using the following equation:

MDCscan = El (Equation 3) 100 Where:

MDCscn = Minimum Detectable Concentration (dpm/100-cm 2),

d' = Index of sensitivity related to the detection decision error rate of the surveyor, from Table 6.5 of MARSSIM [USNRC 2000],

i = observation counting interval, detector width (cm) / scan speed (s),

bi = background counts per observation interval, Ei = Detector Efficiency (counts per disintegration),

Es = Surface Efficiency, typically 25% for alpha and 50% for beta per ISO 7503-1, Table 2 [ISO 1988],

p = Surveyor efficiency (typically 50%) and A = Detector Open Area (cm2).

A summary of the a' priori detection sensitivities of instruments used in the FSS of the Fan House is provided in Table 7.

16

Plum Brook Reactor Facility FSSR, Rev. 0 Table 7, Typical Detection Sensitivities of Field Instruments MDCscan Net cpm Detector (dpm/1 00-cm 2)

Equivalent to (dpm!100c Detector Model Efficiency (2) (3)

Dd (2)

(c/d) 1)DCGLw 2)

LMI 44-116 4 ) 5 )

0.121 2427 3574 477 LMI 43-37 (6) 0.145 742 5254 NA LMI 44-9 (7) 0.072 18,284 304 5,906 Table 7 Notes:

1. The detector efficiencies listed are total efficiency, i. e., E, = Ei + Es.

2.

A' priori scan sensitivities are calculated using Equation 3 and static sensitivities are calculated using Equation 2.

3.

The scan MDC for the LMI 44-116 is calculated in Design No. 23 with background count rate =

200 cpm; the scan speed is 10 cm/s, Ei = 0.242, E, = 0.5 and an efficiency correction factor =

0.8349 is applied to compensate for concrete roughness (the detector-to-surface distance is 0.5 in.).

4. The static MDC for the LMI 44-116 detector is calculated in Design No. 23 with background count rate = 138 cpm, Ei = 0.242, E, = 0.5 and the detector-to-surface distance = 0.5 in. (one minute count times are assumed for both the background and sample counts).

5. the scan MDC for the LMI 43-37 is from Survey Design No.23. The background count rate is 437 cpm; the scan speed is 30 cm/s, Ei = 0.297, E, = 0.5 and the detector-to-surface distance is 0.5 in.

6.

The scan MDC for the LMI 44-9 is obtained from Survey Design No. 23. The background count rate is 109 cpm with a scan speed of 2 cm/s and the detector in contact with the surface.

7. The static MDC for the LMI 44-9 is obtained from Survey Design No. 23. The background count rate is 105 cpm and the detector in contact with the surface (one minute count times are assumed for both the background and sample counts).

Modifications to survey instructions are adjusted to account for unusual measurement conditions. Modified detection sensitivities may be applied taking into account adjustments in detector efficiency. Scan speeds may be reduced to ensure that required scan sensitivities are achieved. The bases for adjustments due to non-standard conditions are provided in PBRF Technical Basis Documents. 14 Examples of areas or locations in Fan House survey units where special measurement conditions apply are shown in Exhibits 17 and 18 of Appendix A.

14 The PBRF-TBD-07-004 [PBRF 2007a] presents efficiency correction factors developed for the LMI 44-116 detector.

The correction factors are presented as a function of detector-to-surface distance. Application of the factors requires.

empirical measurements of the effective detector-to-surface distance for areas with non-standard surface conditions as part of the survey unit inspection process.

17

Plum Brook Reactor Facility FSSR, Rev. 0 5.0 Fan House Survey Results Results of the Fan House FSS are presented in this section. This includes scan survey frequencies (%

of areas covered) for each survey unit and occurrence of events where scan investigation levels were exceeded. Investigations performed and the results are summarized. Fixed measurement results for each survey unit and the results of comparison tests of survey unit maximum and average values with the DCGLw are reported. As discussed below, no statistical tests were required. It is shown that levels of residual contamination have been reduced to levels that are ALARA. This section closes with a summary which concludes that applicable criteria for release of the Fan House for unrestricted use are satisfied and all FSS Plan requirements are met.

5.1 Surveys and Investigations Scan survey results were reviewed to confirm that the scan coverage requirement (as % of survey unit area) was satisfied for all survey units. The results of QC replicate scan surveys were also reviewed to confirm that the minimum coverage requirement of 5% was satisfied.

Results of the Fan House scan surveys are compiled in Table 8. The table shows that scan coverage requirements were satisfied for all survey units. The table also shows that scan investigation levels were exceeded in three survey units (all Fan House survey units are Class 1). The results of the investigations are summarized following Table 8.

Table 8, Scan Survey Results Scan Survey Survey Investigation QC Replicate Scan Survey Unit Class Coverage (%) (1)

Request No.

Level Exceeded Coverage (%) (1) (2)

(3)

FH-1-1 1

100 105 No 9.4 FH-1-2 1

100 105 No 9.4 FH-1-3 1

100 105 No 9.4 FH-1-4 1

100 105 No 9.4 FH-1-5 1

100 105 No 9.4 FH-I-6 (4) 1 100 106 No 6.0 FH-1-7 1

100 106 No 6.0 FH-I-8 (4) 1 100 106 No 6.0 FH-1-9 (4) 1 100 106 No 6.0 FH-1-10 1

100 106 No 6.0 FH-1-11 1

100 106 No 6.0 FH-1-12 1

100 107 No 5.0 FH-1-13 1

100 107 No 5.0 FH-1-14 1

100 107 No 5.0 FH-1-15 1

100 107 No 5.0 FH-1-16 1

100 108 No 6.0 FH-1-17 1

100 108 No 6.0 FH-1-18 1

100 108 No 6.0 FH-1-19 1

100 108 No 6.0 FH-1-20 1

100 108 No 6.0 18

Plum Brook Reactor Facility FSSR, Rev. 0 Table 8, Scan Survey Results - Continued Scan Survey Survey Investigation QC Replicate Scan Survey Unit Class Coverage (%) ()

Request No.

Level Exceeded Coverage (%) (1)(2)(3)

FH-2-1 1

100 109 Yes 6.0 FH-2-2 1

100 109 Yes 6.0 FH-2-3 1

100 109 No 6.0 FH-2-4 1

100 109 No 6.0 FH-2-5 1

100 109 No 6.0 FH-2-6 '4' 1

100 110 No 6.5 FH-2-7 1

100 111 No 7.0 FH-2-8 1

100 111 No 7.0 FH-2-9 1

100 111 No 7.0 FH-2-1 0 14 1

100 111 No 7.0 FH-2-11 1

100 111 No 7.0 FH-2-12 1

100 112 No 5.0 FH-2-13 1

100 112 No 5.0 FH-2-14 1

100 112 No 5.0 FH-2-15 1

100 112 No 5.0 FH-2-16 1

100 113 No 6.0 FH-2-17 1

100 113 Yes 6.0 FH-4-1 1

100 188 No 8.0 Table 8 Notes:

1. Scan % coverage values are rounded to the nearest whole per cent. Values reported with the first decimal as 5, e. g., 5.5, are rounded downward.

2. The % scan coverage is given as the % of the area scanned in the initial survey.

3. Replicate QC scan results are reported for multiple survey units in most Survey Requests. The QC scan percentages are reported as % of the scanned area of the survey units combined. So the same

% coverage value is assigned to all of the survey units reported in a Survey Request.

4. One hundred percent of the accessible surface area was scanned. A fraction of the surface area of

the survey unit is inaccessible for scanning. In most such survey units, it is less than a few percent of the total surface area. In all cases it is less than 10%.

Review of Fan House release records indicates that investigations were performed in three survey units. In survey units FH-2-1 and FH-2-2 (Basement floor), scan alarms were noted while scanning with the floor monitor (LMI 43-37 detector). Two discrete areas were investigated using an LMI 44-116 (100 cm 2) detector. Static measurements were taken and all were < 50% of the DCGLw (the highest activity measured was 10,500 dpm/100-cm2.

A scan investigation level was exceeded in survey unit FH-2-17, Basement structural steel, in the overhead area. The scan was performed with the LMI 44-9 pancake detector, in areas inaccessible to the larger detectors. Elevated activity was observed in a 3.25 in. diameter, 2.25 in. deep pipe stub. Static measurements with the 44-9 detector ranging from 35,000 to 105,000 dpm/100-cm2 were recorded. A comparison was with the applicable DCGLEMC. An Area Factor (AF) of 40.2 was applied to this small area in accordance with the FSS Plan Table 3-6, yielding a DCGLEMC of 1,400,000 dpm/100-cm2. An EMC test was conducted and successfully passed as recorded in the Release Record for this survey unit.

19

Plum Brook Reactor Facility FSSR, Rev. 0 5.2 Fixed Measurements and Tests Results of the assessment of Fan House FSS total surface beta measurements are presented in Table 9 (individual measurements in each survey unit are reported in Appendix B). The table presents the number of measurements, maximum, average and standard deviation for each survey unit. Table 9 compares the maximum activity measured in each survey unit to the DCGLw. It is demonstrated that all measured activity values are less than the DCGLw, thus all survey units meet the 25 mrem/y release criterion. The mean activity of each survey unit is also compared to the DCGLw, and as expected, are all less than the DCGLw. The average of 431 total surface beta measurements reported in the Fan House release records is: 538 + 592 dpm/100-cm 2 (one standard deviation) [PBRF 2010]. 15 Removable surface activity measurements were also performed at each fixed activity measurement location and counted for gross alpha and gross beta activity. A review of the Fan House Release records was conducted to ensure that all smear counting results were less than 10% of the gross activity DCGL. The requirement for PBRF laboratory smear counting instruments is that the MDAs be < 10% of the applicable gross activity DCGL 16. Gross beta and gross alpha counts for all Fan House smears were less than MDA.

Table 9, Fan House Total Surface Beta Activity Measurement Summary and Test Results Test Result:

Standard Test Result:

Survey No. of Maximum Average ID Measurements (1)

Maximum <

(1)

Deviation Average <

Unit DCGLw (1) (2)

DCGLw FH-1-1 11 1130 Yes 682 303 Yes FH-1-2 11 908 Yes 702 184 Yes FH-1-3 11 980 Yes 726 249 Yes FH-1-4 11 1200 Yes 808 298 Yes FH-1-5 11 8000 Yes 1262 2255 Yes FH-1-6 11 373 Yes 149 161 Yes FH-1-7 11 182

Yes, 20 133 Yes FH-1-8 11 1030 Yes 185 417 Yes FH-1-9 11 1370 Yes 343 546 Yes FH-1-10 11 1040 Yes 312 494 Yes FH-1-11 11 1190 Yes 855 167 Yes FH-1-12 11 439 Yes 138 146 Yes FH-1-13 11 347 Yes 146 134 Yes FH-1-14 11 429 Yes 182 182 Yes FH-1-15 11 818 Yes 234 402 Yes 15 It is noted that in converting total surface activity measurements in cpm to dpm/100-cm 2, the detector background response from surface materials is not subtracted. As a result, the total surface activity measurement results are biased high.

16 Typical MDAs for PBRF low background smear counting instruments are 14 dpm for alpha and 18 dpm for beta.

Smears cover 100 cm2, so these NMDA values are equivalent to dpm/100-cm2.

20

Plum Brook Reactor Facility FSSR, Rev. 0 Table 9, Fan House Total Surface Beta Activity Measurement Summary and Test Results -

Continued Test Result:

Standard Test Result:

Survey No. of Maximum Average Unit ID Measurements

()

Maximum <

(1)

Deviation Average <

DCGLw (1) (2)

DCGLw FH-1-16 3a 13 212 Yes

-12 112 Yes FH-1-17(3 )

12 575 Yes 42 238 Yes FH-1-18 11 286 Yes 76 92 Yes FH-1-19 11 146 Yes 27 84 Yes FH-1-20(3 )

12 255 Yes 70 118 Yes FH-2-1 11 3370 Yes 1173 892 Yes FH-2-2 11 1670 Yes 996 293 Yes FH-2-3 11 1770 Yes 954 377 Yes FH-2-4 11 3100 Yes 1117 695 Yes FH-2-5 11 1667 Yes 886 394 Yes FH-2-6 11 1112 Yes 597 426 Yes FH-2-7(31 15 972 Yes 738 199 Yes FH-2-8 11 1040 Yes 629 282 Yes FH-2-9 11 1160 Yes 844 238 Yes FH-2-10 3a 14 1060 Yes 787 192 Yes FH-2-11 11 922 Yes 658 153 Yes FH-2-12 11 1270 Yes 742 224 Yes FH-2-13 11 1080 Yes 739 283 Yes FH-2-14 11 1130 Yes 649 252 Yes FH-2-15 11 939 Yes 710 187 Yes FH-2-16 11 245 Yes 99 119 Yes FH-2-17 11 436 Yes 142 157 Yes FH-4-1 (3) 12 1550 Yes 1069 283 Yes Table 9 Notes:

1. The units for: maximum, average and standard deviation are dpm/1 00-cm 2.

2. Standard deviations of the measurements in each survey unit are reported for comparison to the values used in the survey design (see Table 8). In all the Fan House structural survey units, values of o obtained from the FSS measurements are less (usually much less) than values used in the survey designs.

3. In the FSS design calculation for survey units developed using VSP, "extra" fixed measurement locations are sometimes added when "fitting" the calculated grid size onto the survey unit layout.

5.3 ALARA Evaluation It is shown that residual contamination in the Fan House has been reduced to levels that are ALARA, using a method acceptable to the NRC. The NRC guidance on determining that residual contamination levels are ALARA includes the following:

"In light of the conservatism in the building surface and surface soil generic screening levels developed by the NRC, NRC staff presumes, absent information to the contrary, that licensees who remediate building surfaces or soil to the generic screening levels do not need to provide analyses to demonstrate that these screening levels are 21

Plum Brook Reactor Facility FSSR, Rev. 0 ALARA. In addition, if residual radioactivity cannot be detected, it may be presumed that it had been reduced to levels that are ALARA. Therefore the licensee may not need to conduct an explicit analysis to meet the ALARA requirement." 17 Screening level values published by the NRC for the mix of radionuclides in structural surface residual contamination potentially present in the Fan House are shown in Table 10. Since individual radionuclide activity concentrations are not measured in the FSS of structures, a direct comparison of residual contamination levels to individual radionuclide screening level values is not possible. A comparison can be made by converting the nuclide-specific screening level values to an appropriate gross activity DCGL. This is accomplished using activity fractions used in development of the Fan House gross activity DCGL. A screening level value that is equivalent to the gross activity DCGL was calculated using the equations in Section 3.6 of the FSS Plan. 18 The activity fractions listed in Table 1 (also shown in Table 10) were used in the calculation. The screening level equivalent DCGL for the Fan House is 2

calculated to be 721 dpm/1 00-cm2.

As reported in Section 5.2, the average total surface beta activity measured in the FSS of the Fan House is 538 +/- 592 dpm/100-cm2 (one standard deviation). The upper limit of the 95t %

confidence interval of this mean value is 594 dpm/100-cm2.19 This value is below the screening level gross activity DCGL of 721 dpm/100-cm 2. From this comparison, it is concluded that the ALARA criterion is satisfied.

Table 10, Screening Level Values for Fan House and Radionuclide Activity Fractions Radionuclide Screening Level Value Fan House (dpm/1 00-cm 2)

Activity Fraction

~(%)

H-3 1.2 E+08

77.7 Co-60 7.1E+03

)

0 Sr-90 8.7E+03 (l) 0 1-129 3.5E+04(')

0 Cs-137 2.8E+04 (1) 5.6 Eu-154 1.2E+04121 0

U-234 1.2E+02 (2) 16.7 U-235 1.3E+02121 0

Table 10 Notes.

1. Values from NUREG-1757 Vol. 2, Table H.1 [USNRC 2006].

2. Values from NUREG/CR-5512, Vol. 3, Table 5.19 [SNL 1999]. These are 75th percentile values of residual surface activity corresponding to 25 mrem!y to a future building occupant.

17 This guidance was initially published in Draft Regulatory Guide DG-4006, but has been reissued in NUREG-1757 Volume 2, Appendix N.

'S The equivalent screening level gross activity DCGL is calculated using an EXCEL template [PBRF 2010]. This template incorporates the equations in section 5.3 of the FSS Plan [NASA 2007].

19 The upper limit of the confidence interval, 95t percentile value, is calculated as: UL = mean + 1.96 a//n, where n =

431 measurements.

22

Plum Brook Reactor Facility FSSR, Rev. 0 5.4 Comparison with EPA Trigger Levels The PBRF license termination process includes a review of residual contamination levels in groundwater and soil, as applicable, in accordance with the October 2002 Memorandum of Understanding (MOU) between the US NRC and the US Environmental Protection Agency (EPA) [USEPA 2002]. Concentrations of individual radionuclides, identified as "trigger levels" for further review and consultation between the agencies, are published in the MOU.

The trigger levels applicable to the PBRF for residual soil concentrations of the radionuclides of concern are:

Co-60, 4 pCi/g,

Sr-90 (plus daughter activity), 23 pCi/g and

" Cs-137 (plus daughter activity), 6 pCi/g.

As no soil or groundwater measurement results are reported for the Fan House FSS, the comparison with EPA Trigger Levels is not applicable.

5.5 Conclusions The results presented above demonstrate that the Fan House satisfies all FSS Plan commitments and meets the release criteria in 1 OCFR20 Subpart E. The principal conclusions are:

Scan surveys were performed in 100 % of the accessible surfaces of all 38 Fan House survey units - all were Class 1.

Residual surface contamination above investigation levels was detected in only three of 38 survey units. A small area of elevated activity above the DCGLw was measured in one survey unit. The EMC test was conducted and was satisfied.

All randomly selected fixed total surface activity measurements are less than the applicable DCGLw.

All survey unit mean fixed measurement results (total surface beta activity) are below the DCGLw, hence no statistical tests were required.

All removable surface activity measurements are less than 10% of the DCGLw.

" Residual surface activity and soil concentration measurement results are shown to be less than NRC screening level values - demonstrating that the ALARA criterion is satisfied.

Only minor changes from what was proposed in the FSS Plan were made - the classification of one survey unit was increased above what was proposed in the Plan.

There were no changes from initial assumptions (in the FSS Plan) regarding the extent of residual activity in the Fan House. No reclassification of survey units was required as a result of FSS measurements and investigations.

23

Plum Brook Reactor Facility FSSR, Rev. 0 6.0 References GTS 1998 ISO 1988 MWH 2005 NASA 2006 NASA 2007 NASA 2007a PBRF 1972 PBRF 2007 PBRF 2007a PBRF 2009 PBRF 2010 PNL 2010 SNL 1999 TELE 1987 GTS-Duratek, Inc., NASA/Lewis Plum Brook Facility 1998 Confirmation Survey, Volume 1 - Survey Packages and Survey Results, November 1998.

International Organization for Standardization, Evaluation of Surface Contamination, Part 1: Beta Emitters and Alpha Emitters, ISO-7503-1, 1988.

MWH Constructors, Inc., Investigation of Radioactivity in PBRF Concrete, Prepared for US Army Corps of Engineers Under Contract DACW-27-97-0015, August 2005.

NASA Safety and Mission Assurance Directorate, Plum Brook Reactor Facility, Decommissioning Project Quality Assurance Plan, QA-0 1, Revision 2, February 2006.

NASA Safety and Mission Assurance Directorate, Final Status Survey Plan for the Plum Brook Reactor Facility, Revision 1, February 2007.

NASA Safety and Mission Assurance Directorate, Decommissioning Plan for the Plum Brook Reactor Facility, Revision 6, July 2007.

Plum Brook Reactor Facility HSS Rad. No. 4, Radiological Control Zone Criteria, September 1972.

Plum Brook Reactor Facility Technical Basis Document, Adjusted Gross DCGLsfor.

Structural Surfaces, PBRF-TBD-07-001, June 2007.

Plum Brook Reactor Facility Technical Basis Document, Efficiency Correction Factor, PBRF-TBD-07-004, November 2007.

Plum Brook Reactor Facility, Memorandum to Project File, J. L. Crooks, Don Young, Final FSS Report Background -NASA Plum Brook Reactor Facility Fan House Building (FH) (1132), December 8, 2009.

Plum Brook Reactor Facility Decommissioning Project Office, Memorandum to Project File, Engineering Record for Final Status Survey Report Calculations. April 13, 2010.

Battelle Pacific Northwest Laboratories (PNL), Visual sample Plan, Version 5.9, 2010.

Sandia National Laboratories (SNL), for US Nuclear Regulatory Commission, Residual Radioactive Contamination From Decommissioning, Parameter Analysis, NUREG/CR-5512, Vol.3, Oct. 1999.

Teledyne Isotopes, An Evaluation of the Plum Brook Reactor Facility and Documentation of Existing Conditions, Prepared for NASA Lewis Research Center, December 1987.

24

Plum Brook Reactor Facility FSSR, Rev. 0 USEPA 2002 USNRC 2000 Memorandum of Understanding, US Environmental Protection Agency and US Nuclear Regulatory Commission, Consultation and Finality on Decommissioning and Decontamination of Contaminated Sites, October 9, 2002.

US Nuclear Regulatory Commission, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM), NUREG-1575, Rev. 1, August 2000.

USNRC 2006 US Nuclear Regulatory Commission, Consolidated Decommissioning Guidance, Characterization, Survey and Determination of Radiological Criteria, NUREG 1757, Vol. 2, Rev.1, September 2006.

7.0 Appendices Appendix A - Exhibits Appendix B - Survey Unit Maps and Tables Showing Measurement Locations and Results 25

Final Status Survey Report Fan House (Building 1132)

Revision 0 Appendix A Exhibits

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 2 of 23 List of Exhibits Exhibit 1, Fan H ouse Exterior V iew s..............................................................................................

3 Exhibit 2, Fan House Exterior View from East...............................................................................

4 Exhibit 3, Fan House First Floor Survey Units...............................................................................

5 Exhibit 4, Fan House Basement Survey Units...............................................................................

6 Exhibit 5, Fan House 1st Floor Views (Survey Units FH-1-1 & 1-2)............................................

7 Exhibit 6, Fan House Ist Floor Views (Survey Units FH-1-3 & 1-4)............................................

8 Exhibit 7, Views of Fan House Ist Floor Wall Surfaces (Survey Unit FH-1-6)............................. 9 Exhibit 8, Additional Views of Fan House 1 st Floor Walls (Survey Unit FH-1-7)...................... 10 Exhibit 9, Views of Fan House 1st Floor Ceiling (Survey Unit FH-1-13).........................................

11 Exhibit 10, Fan House Basement Floor (Survey Unit FH-2-4).....................................................

12 Exhibit 11, Fan House Sumps (Survey Unit FH-2-5)....................................................................

13 Exhibit 12, Fan House Basement Stairs (Survey Unit FH-2-6).....................................................

14 Exhibit 13, Views of Fan House Basement Walls (Survey Unit FH-2-8).....................................

15 Exhibit 14, Fan House Basement Stairway Walls (Survey Unit FH-2-10)................................... 16 Exhibit 15, Fan House Basement Ceiling (Survey Unit FH-2-13)................................................ 17 Exhibit 16, Fan House Basement Room Ceilings (Survey Units FH-2-15)................................. 18 Exhibit 17, Unusual Condition Measurement (UCM) Areas (Survey Unit FH-1-1)..................... 19 Exhibit 18, Unusual Condition Measurement (UCM) Areas (Survey Units FH-1-4 & 2-17).....

20 Exhibit 19, Sheet Metal Removal from Fan House......................................................................

21 Exhibit 20, Removal of Fan House Stack Foundation.......................................................................

22 Exhibit 21, Disposition of Fan House M aterials...........................................................................

23

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 3 of 23 Exhibit 1, Fan House Exterior Views View Showing North and East Sheet Metal Walls

/"

View Showing South and West Concrete Walls

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 4 of 23 Exhibit 2, Fan House Exterior View from East View from East ShowinR Stack Foundation

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 5 of 23 Exhibit 3, Fan House First Floor Survey Units 1~)

(2)

(3)I p

r I 2

SECTION 1 SECTION 1 OPERATING AREA SECTION 2 ROOM 1 CLASS I

-CLASS 2

-CLASS 3

0 0

(j)

(j o K) SECTION3 DEIONIZER C 0 ROOM 4 H

H D]

Dl o

SECTION 4 0Rý Survey Unit #

Class Description FH-1-1 1

Is' Floor - Floor Section 1 FH-1-2 1

Is' Floor - Floor Section 2 FH-1-3 1

Vst Floor-Floor Section 3 FH-1-4 1

I" Floor - Floor Section 4 FH-1-5 1

1V' Floor - Floor Section 5 FH-1-6 1

1s' Floor - Wall Section 1 FH-1-7 1

iV' Floor - Wall Section 2 FH-1-8 1

1Vt Floor - Wall Section 3 FH-1-9 1

Ist Floor - Wall Section 4 FH-I-10 1

1V Floor - Wall Section 5 FH-1-11 1

1st Floor - Wall Section 6 FH-1-12 1

IVt Floor-Ceiling Section 1 FH-1-13 1

Vst Floor - Ceiling Section 2 FH-1-14 1

1Vt Floor - Ceiling Section 3 FH-1-15 I

Vst Floor - Ceiling Section 4 FH-1-16 I

I's Floor - Steel - columns FH-1-17 1

1st Floor - Steel - wall steel FH-1-18 1

is' Floor - Steel - roof steel section 1 FH-1-19 1

is' Floor - Steel - roof steel section 2 FH-1-20 1

1' Floor - Steel - roof steel section 3

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 6 of 23 Exhibit 4, Fan House Basement Survey Units T

T T

T CLASS 1

-CLASS 2

mCLASS 3 Survey Unit #

Class Description FH-2-1 1

Basement - Floor - Section 1 FH-2-2 I

Basement - Floor - Section 2 FH-2-3 I

Basement - Floor - Section 3 FH-2-4 I

Basement - Floor - Section 4 FH-2-5 I

Basement - Floor - Section 5 FH-2-6 I

Basement - Floor - Stairs & Valve Pit FH-2-7 I

Basement - Walls - Section 1 FH-2-8 1

Basement - Walls - Section 2 FH-2-9 I

Basement - Walls - Section 3 FH-2-1 0 1

Basement - Walls - Stairway & Air Monitor Room FH-2-11 1

Basement - Walls - Sump Room FH-2-12 1

Basement - Ceiling - Section 1 FH-2-13 1

Basement - Ceiling - Section 2 FH-2-14 1

Basement - Ceiling - Section 3 FH-2-15 1

Basement - Ceiling - Section 4 FH-2-16 1

Basement - Steel - Section 1 FH-2-17 1

Basement - Steel - Section 2

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 7 of 23 Exhibit 5, Fan House 1st Floor Views (Survey Units FH-1-1 & 1-2) ction 1 General Area View I

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 8 of 23 Exhibit 6, Fan House Vst Floor Views (Survey Units FH-1-3 & 1-4)

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 9 of 23 Exhibit 7, Views of Fan House 1st Floor Wall Surfaces (Survey Unit FH-1-6)

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 10 of 23 Exhibit 8, Additional Views of Fan House 1st Floor Walls (Survey Unit FH-1-7)

Plywood Com

t Vent Penetra n Center East Wall

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 11 of 23 Exhibit 9, Views of Fan House 1st Floor Ceiling (Survey Unit FH-1-13) v Lookii

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 12 of 23 Exhibit 10, Fan House Basement Floor (Survey Unit FH-2-4)

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 13 of 23 Exhibit 11, Fan House Sumps (Survey Unit FH-2-5)

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 14 of 23 Exhibit 12, Fan House Basement Stairs (Survey Unit FH-2-6)

Gene

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 15 of 23 Exhibit 13, Views of Fan House Basement Walls (Survey Unit FH-2-8)

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 16 of 23 Exhibit 14, Fan House Basement Stairway Walls (Survey Unit FH-2-10)

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 17 of 23 Exhibit 15, Fan House Basement Ceiling (Survey Unit FH-2-13)

General Area View Lookina West

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 18 of 23 Exhibit 16, Fan House Basement Room Ceilings (Survey Units FH-2-15)

Rnnrm C.ilinn I nnlinn MJnrth General Area View Pump Room Ceiling

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 19 of 23 Exhibit 17, Unusual Condition Measurement (UCM) Areas (Survey Unit FH-1-1)

Pine Penetration Stubs on Floor qrnhhI~d Art-n nn Ploor

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 20 of 23 Exhibit 18, Unusual Condition Measurement (UCM) Areas (Survey Units FH-1-4 & 2-17)

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 21 of 23 Exhibit 19, Sheet Metal Removal from Fan House Removal of North Wall and Roof, May 11, 2010 Completion of Fan House above Grade Demolition, May 11, 2010

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 22 of 23 Exhibit 20, Removal of Fan House Stack Foundation Demolition of Stack Foundation Area East of Fan House after Removal of Stack Foundation

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix A, Rev. 0, Page 23 of 23 Exhibit 21, Disposition of Fan House Materials Materials Staging Area Staged Material and Friskii

Plum Brook Reactor Facility Final Status Survey Report Fan House (Building 1132)

Revision 0 Appendix B Survey Unit Maps and Tables Showing Measurement Locations and Results

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 2 of 40 Index of Fan House Survey Unit Maps and Tables of Coordinates Survey Unit Description Page Number (Rm=Room; FI=Floor; Lw=Lower wall; Uw=Upper wall; WJ=Window ledges)

Number of Pages FH-1-1 Ist Floor - Floor Section 1 3

1 FH-1-2 1st Floor - Floor Section 2 4

1 FH-1-3 Ist Floor - Floor Section 3 5

1 FH-1-4 1 Floor - Floor Section 4 6

1 FH-1-5 I" Floor - Floor Section 5 7

1 FH-1-6 1st Floor - Wall Section 1 8

1 FH-1-7 1st Floor - Wall Section 2 9

1 FH-1-8 1 Floor - Wall Section 3 10 1

FH-1-9 I" Floor - Wall Section 4 11 1

FH-1-10 I t Floor - Wall Section 5 12 1

FH-1-11 I1 t Floor - Wall Section 6 13 1

FH-1-12 1st Floor - Ceiling Section 1 14 1

FH-1-13 1st Floor - Ceiling Section 2 15 1

FH-1-14 Ist Floor - Ceiling Section 3 16 1

FH-1-15 1st Floor - Ceiling Section 4 17 1

FH-1-16 It Floor - Steel - columns 18 1

FH-1-17 1st Floor - Steel - wall steel 19 1

FH-1-18 I' Floor - Steel - roof steel section 1 20 1

FH-1-19 Vst Floor - Steel - roof steel section 2 21 1

FH-1-20 I t Floor - Steel - roof steel section 3 22 1

FH-2-1 Basement - Floor - Section 1 23 1

FH-2-2 Basement - Floor - Section 2 24 1

FH-2-3 Basement - Floor - Section 3 25 1

FH-2-4 Basement - Floor - Section 4 26 1

FH-2-5 Basement - Floor - Section 5 27 1

FH-2-6 Basement - Floor - Stairs & Valve Pit 28 1

FH-2-7 Basement - Walls - Section 1 29 1

FH-2-8 Basement - Walls - Section 2 30 1

FH-2-9 Basement - Walls - Section 3 31 1

FH-2-10 Basement - Walls - Stairway & Air Monitor Room 32 1

FH-2-11 Basement - Walls - Sump Room 33 1

FH-2-12 Basement - Ceiling - Section 1 34 1

FH-2-13 Basement - Ceiling - Section 2 35 1

FH-2-14 Basement - Ceiling - Section 3 46 1

FH-2-15 Basement - Ceiling - Section 4 37 1

FH-2-16 Basement - Steel - Section 1 38 1

FH-2-17 Basement - Steel - Section 2 39 1

FH-4-1 Exterior South & West Concrete Walls 40 1

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 3 of 40 Survey Unit FH-1-1 Fan House - lt Floor - Floor Section 1 FH-1-1 AREA: Fan House 1t Floor, Floor Section 1 Measurement Locations and results Location I X Co-ord (m)

YCo-ord (m) dpm/lOOcm2 Type Notes 1.4 1.1 SM-1 765 Systematic N/A 4.0 1.1 SM-2 714 Systematic N/A 6.6 1.1 SM-3 337 Systematic N/A 9.3 1.1 SM-4 1040 Systematic N/A 14.5 1.1 SM-5 510 Systematic N/A 0.1 3.3 SM-6 1020 Systematic N/A 2.7 3.3 SM-7 653 Systematic N/A 5.3 3.3 SM-8 1130 Systematic N/A 8.0 3.3 SM-9 745 Systematic N/A 10.6 3.3 SM-10 388 Systematic N/A 13.2 3.3 SM-11 204 Systematic N/A

All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 4 of 40 Survey Unit FH-1-2 Fan House - 1 st Floor - Floor Section 2 FH-1-2 AREA: Fan House 1t Floor, Floor Section 2 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (im) dpm/IOOcm 2 Type Notes 0.8 1.0 SM-1 878 Systematic N/A 4.0 1.0 SM-2 602 Systematic N/A 7.3 1.0 SM-3 582 Systematic N/A 10.5 1.0 SM-4 327 Systematic N/A 13.7 1.0 SM-5 878 Systematic N/A 2.4 3.8 SM-6 908 Systematic N/A 5.6 3.8 SM-7 500 Systematic N/A 8.9 3.8 SM-8 847 Systematic N/A 12.1 3.8 SM-9 765 Systematic N/A 15.3 3.8 SM-10 673 Systematic N/A 18.6 3.8 SM-11 765 Systematic N/A

All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 5 of 40 Survey Unit FH-1-3 Fan House - 1't Floor - Floor Section 3 FH-1-3 AREA: Fan House Id Floor, Floor Section 3 Measurement Locations and results Location I X Co-ord (im) Y Co-ord (m) dpm/1OOcm 2 Type Notes 0.4 0.8 SM-1 388 Systematic N/A 3.8 0.8 SM-2 622 Systematic N/A 7.3 0.8 SM-3 194 Systematic N/A 10.7 0.8 SM-4 837 Systematic N/A 14.1 0.8 SM-5 776 Systematic N/A 17.6 0.8 SM-6 622 Systematic N/A 2.1 3.8 SM-7 918 Systematic N/A 5.5 3.8 SM-8 980 Systematic N/A 9.0 3.8 SM-9 959 Systematic N/A 12.4 3.8 SM-10 867 Systematic N/A 15.8 3.8 SM-11 827 Systematic N/A

All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 6 of 40 Survey Unit FH-1-4 Fan House - 1st Floor - Floor Section 4 FH-1-4 AREA: Fan House Ist Floor, Floor Section 4 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpm/IOOcm 2 Type Notes 1.2 1.1 SM-1 1,070 Systematic N/A 1.8 1.1 SM-2 541 Systematic N/A 2.6 1.1 SM-3 327 Systematic N/A 5.3 1.1 SM-4 1170 Systematic N/A 8.0 1.1 SM-5 1200 Systematic N/A 10.7 1.1 SM-6 469 Systematic N/A 1.2 3.5 SM-7 857 Systematic N/A 3.9 3.5 SM-8 684 Systematic N/A 6.6 3.5 SM-9 653 Systematic N/A 9.3 3.5 SM-10 1080 Systematic N/A 12.0 3.5 SM-11 837 Systematic N/A

All of the sample measurements are taken from the location shown on the map.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 7 of 40 Survey Unit FH-1-5 Fan House - 1st Floor - Floor Section 5 0

m0

-- 0a 0

LIL 1.

E3 *No.

i

[I~

~

"D 0

1o

-II E*

°

°=3 13 r@i LIEI 0

0 0

0 FH-1-5 AREA: Fan House 1s Floor, Floor Section 5 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpm/ lOOcm 2 Type Notes 0.1 0.2 SM-1 8000 Systematic N/A 0.4 0.4 SM-2 837 Systematic N/A 0.6 0.2 SM-3 593 Systematic N/A 0.5 0.9 SM-4 301 Systematic N/A 2.3 0.5 SM-5 829 Systematic N/A 1.8 0.5 SM-6 472 Systematic N/A 0.1 0.5 SM-7 276 Systematic N/A 1.1 2.6 SM-8 894 Systematic N/A 0.6 2.7 SM-9 545 Systematic N/A 1.4 2.7 SM-10 57 Systematic N/A 2.3 4.8 SM-11 1080 Systematic N/A

All of the sample measurements are taken from the southwest/lower left corner of the surface on which they rest/lie.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 8 of 40 Survey Unit FH-1-6 Fan House 1st Floor-Wall Section 1 FH-1-6 AREA: Fan House I' Floor, Wall Section 1 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpmllOOcm 2 Type Notes 1.5 0.4 SM-1

-73 Systematic N/A 4.2 0.4 SM-2 345 Systematic N/A 6.8 0.4 SM-3 55 Systematic N/A 9.5 0.4 SM-4 27 Systematic N/A 12.1 0.4 SM-5 18 Systematic N/A

-2.4 2.7 SM-6

-36 Systematic N/A 0.2 2.7 SM-7 173 Systematic N/A 2.9 2.7 SM-8 345 Systematic N/A 5.5 2.7 SM-9 373 Systematic N/A 8.2 2.7 SM-10 173 Systematic N/A 10.8 2.7 SM-11 236 Systematic N/A

All of the sample measurements are taken from the location shown on the map.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 9 of 40 Survey Unit FH-1-7 Fan House - Floor, Wall Section 2 FH-1-7 AREA: Fan House 1s Floor, Wall Section 2 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord in) dpm/lOOcm 2 Type Notes 1.2 0.2 SM-1 173 Systematic N/A 1.8 0.2 SM-2 182 Systematic N/A 4.5 0.2 SM-3

-9 Systematic N/A 7.2 0.2 SM-4

-100 Systematic N/A 10.0 0.2 SM-5

-145 Systematic N/A 12.7 0.2 SM-6 55 Systematic N/A 0.2 2.6 SM-7 18 Systematic N/A 0.4 2.6 SM-8 164 Systematic N/A 3.1 2.6 SM-9

-227 Systematic N/A 8.6 2.6 SM-10 64 Systematic N/A 11.3 2.6 SM-11 45 Systematic N/A M-1 of me sample measurements are taken Trom mne lower left corner OT me surface on wnicn they lie.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 10 of 40 Survey Unit FH-1-8 Fan House - 1st Floor, Wall Section 3 09P-SM4 FH-1-8 AREA: Fan House 1"t Floor, Wall Section 3 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord in) dpm/IOOcm 2 Type Notes 2.2 0.5 SM-1 155 Systematic N/A 4.9 0.5 SM-2 64 Systematic N/A 7.7 0.5 SM-3

-218 Systematic N/A 10.4 0.5 SM-4 64 Systematic N/A 3.3 0.5 SM-5 945 Systematic N/A 0.9 2.9 SM-6 9

Systematic N/A 3.6 2.9 SM-7

-55 Systematic N/A 6.3 2.9 SM-8 173 Systematic N/A 9.0 2.9 SM-9

-200 Systematic N/A 11.7 2.9 SM-10 64 Systematic N/A 1.9 2.9 SM-11 1030 Systematic N/A

All of the sample measurements are taken trom the lower left comer of the surface on which they lie.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 1 1 of 40 Survey Unit FH-1-9 Fan House - 1st Floor, Wall Section 4 1I1 4,

4, 4>'>

<4>

4>4, FH-1-9 AREA: Fan House 1"t Floor, Wall Section 4 Measurement Locations and results Location I X Co-ord (m)

Y Co-ord (m) dpm/1OOcm 2 Type Notes 2.6 0.7 SM-1 1370 Systematic N/A 3.0 0.4 SM-2 600 Systematic N/A 6.1 0.4 SM-3 891 Systematic N/A 2.7 0.4 SM-4

-9 Systematic N/A 5.8 0.4 SM-5

-127 Systematic N/A 1.4 3.2 SM-6 591 Systematic N/A 4.6 3.2 SM-7 891 Systematic N/A 1.0 3.2 SM-8

-136 Systematic N/A 4.2 3.2 SM-9

-127 Systematic N/A 7.4 3.2 SM-10 36 Systematic N/A 10.6 3.2 SM-11

-209 Systematic N/A "Al or the sample measurements are taken from the lower left comer or the surface on which they lie.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 12 of 40 Survey Unit FH-1-10 Fan House - 1st Floor, Wall Section 5 Men's Toilet Room Records Room Janitors Room FH-I -10 AREA: Fan House It Floor, Wall Section 5 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpm/1OOcm 2 Type Notes 1.1 0.5 SM-1 1020 Systematic N/A 2.4 0.5 SM-2 745 Systematic N/A 2.9 1.5 SM-3 64 Systematic N/A 2.9 1.5 SM-4

-109 Systematic N/A 2.9 1.5 SM-5 1040 Systematic N/A 2.9 1.5 SM-6 818 Systematic N/A 0.8 0.4 SM-7 109 Systematic N/A 0.8 0.4 SM-8 127 Systematic N/A 0.7 0.4 SM-9

-282 Systematic N/A 1.4 3.1 SM-10

-182 Systematic N/A 2.3 3.1 T SM-11 82 Systematic N/A All of the sample measurements are taken trom the lower left corner ot the surface on which they lie.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 13 of 40 Survey Unit FH-1-11 Fan House - 1st Floor, Wall Section 6 4cb SM A

SM-ý SMI I;

ý**ý*O Deionizer Room E3==

3==

EM=

C=

E=m IDI 3==

FH-1 -11 AREA: Fan House 1lt Floor, Wall Section 6 Measurement Locations and results Location I X Co-ord (mi) Y Co-ord in) dpm/1OOcm2 Type Notes 3.3 0.4 SM-1 764 Systematic N/A 2.7 0.4 SM-2 982 Systematic N/A 3.7 0.4 SM-3 600 Systematic N/A 1.8 0.4 SM-4 891 Systematic N/A 1.0 0.4 SM-5 836 Systematic N/A 1.4 3.7 SM-6 1190 Systematic N/A 0.9 3.7 SM-7 973 Systematic N/A 1.9 3.7 SM-8 636 Systematic N/A 5.6 3.7 SM-9 755 Systematic N/A 0.5 3.7 SM-10 873 Systematic N/A 0.4 3.7 SM-11 900 Systematic N/A

All of the sample measurements are taken from the lower left corner of the surface on which they lie.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 14 of 40 Survey Unit FH-1 -12 Fan House - 1st Floor, Ceiling Section 1 0

0 0

Ibj Ng Ofi FH-1-12 AREA: Fan House I8 Floor, Ceiling Section 1 Measurement Locations and results Location /

X Co-ord (m) Y Co-ord (m) dpmllOOcm Type Notes 1.4 0.7 SM-1 122 Systematic N/A 4.6 0.7 SM-2 184 Systematic N/A 7.7 0.7 SM-3 102 Systematic N/A 10.9 0.7 SM-4 245 Systematic N/A 14.1 0.7 SM-5 439 Systematic N/A 17.3 0.7 SM-6 184 Systematic N/A 3.0 3.5 SM-7 102 Systematic N/A 6.2 3.5 SM-8

-41 Systematic N/A 9.3 3.5 SM-9 102 Systematic N/A 12.5 3.5 SM-10

-122 Systematic N/A 15.7 3.5 SM-11 204 Systematic N/A

All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 15 of 40 Survey Unit FH-1 -13 Fan House - 1st Floor, Ceiling Section 2 J

i-Il FH-1-13 AREA: Fan House 1et Floor, Ceiling Section 2 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (1m) dpm/llOOcm 2 Type Notes 2.5 0.6 SM-1 214 Systematic N/A 6.1 0.6 SM-2 214 Systematic N/A 9.7 0.6 SM-3 82 Systematic N/A 13.3 0.6 SM-4 194 Systematic N/A 16.9 0.6 SM-5 0

Systematic N/A 0.7 3.7 SM-6 20 Systematic N/A 4.3 3.7 SM-7

-112 Systematic N/A 7.9 3.7 SM-8 245 Systematic N/A 11.5 3.7 SM-9 245 Systematic N/A 15.1 3.7 SM-10 153 Systematic N/A 18.7 3.7 SM-11 347 Systematic N/A

All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 16 of 40 Survey Unit FH-1-14 Fan House - 1st Floor, Ceiling Section 3 0

FH-1-14 AREA: Fan House lt Floor, Ceiling Section 3 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpmllOOcm 2 Type Notes 0.8 0.6 SM-1 255 Systematic N/A 4.4 0.6 SM-2 388 Systematic N/A 8.0 0.6 SM-3 245 Systematic N/A 11.6 0.6 SM-4 429 Systematic N/A 15.2 0.6 SM-5

-82 Systematic N/A 18.7 0.6 SM-6 184 Systematic N/A 2.6 3.7 SM-7 51 Systematic N/A 6.2 3.7 SM-8 102 Systematic N/A 9.8 3.7 SM-9

-92 Systematic N/A 13.4 3.7 SM-10 122 Systematic N/A 16.9 3.7 SM-11 398 Systematic N/A

All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 17 of 40 Survey Unit FH-1-15 Fan House - 1st Floor, Ceiling Section 4 0

FH-1-15 AREA: Fan House 1t Floor, Ceiling Section 4 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpm/1OOcm 2 Type Notes 2.3 0.4 SM-1 818 Systematic N/A 1.0 0.4 SM-2 445 Systematic N/A 2.7 0.4 SM-3

-347 Systematic N/A 6.3 0.4 SM-4

-133 Systematic N/A 9.9 0.4 SM-5

-61 Systematic N/A 0.9 3.5 SM-6 378 Systematic N/A 4.5 3.5 SM-7

-41 Systematic N/A 8.1 3.5 SM-8 173 Systematic N/A 11.7 3.5 SM-9

-82 Systematic N/A 2.1 1.2 SM-10 653 Systematic N/A 0.2 2.1 SM-11 776 Systematic N/A

Sample measurements are taken from the locations shown on the map.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 18 of 40 Survey Unit FH-1-16 Fan House - 1st Floor, Vertical Support Columns MlM Im FH-1-16 AREA: Fan House Ilt Floor, Vertical Support Columns Measurement Locations and results Location I X Co-ord (m)

Y Co-ord (im) dpmlcOOCm 2 Type Notes 0.1 0.8 SM-1 212 Systematic N/A 0.1 0.8 SM-2

-142 Systematic N/A 0.1 4.0 SM-3

-133 Systematic N/A 0.1 4.0 SM-4

-124 Systematic N/A 0.1 4.0 SM-5

-97 Systematic N/A 0.1 2.7 SM-6

-9 Systematic N/A 0.1 2.7 SM-7 9

Systematic N/A 0.1 2.7 SM-8 159 Systematic N/A 0.1 2.7 SM-9 35 Systematic N/A 0.1 0.9 SM-10 80 Systematic N/A 0.1 0.9 SM-11

-80 Systematic N/A 0.1 0.9 SM-12

-80 Systematic N/A 0.1 0.9 SM-13 9

Systematic N/A

All sample measurements are taken from the lower left corner of the surface on which they lie.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 19 of 40 Survey Unit FH-1-17 Fan House - 1st Floor, Wall Support Steel IR I

North Wall Steel Eý-

South Wall Steel rD/ r East Wall Steel owl t==

W West Wall Steel mEo 1ýý

=- ---

FH-1-17 AREA: Fan House Ist Floor, Wall Support Steel Measurement Locations and results Location /

X Co-ord (im) Y Co-ord (m) dpm/100cm2 Type Notes 3.6 Centered SM-1

-27 Systematic Front edge of C-Channel 2.2 Edge SM-2 177 Systematic Bottom of I-Beam 4.1 Edge SM-3 239 Systematic Top of C-Channel 8.1 Edge SM-4

-168 Systematic Top of C-Channel 2.3 Edge SM-5

-44 Systematic Top of C-Channel 0.2 Edge SM-6

-106 Systematic Top of C-Channel 2.5 Edge SM-7

-35 Systematic Top of C-Channel 6.6 Edge SM-8

-18 Systematic Top of C-Channel 10.6 Edge SM-9 62 Systematic Top of C-Channel 0.2 1.2 SM-10 212 Systematic Left side of C-Channel Edge 1.2 SM-1 1 575 Systematic Inner edge of C-Channel Edge 1.2 SM-12

-363 Systematic Left edge of C-Channel

For horizontally oriented steel, the sample x-coordinate is measured from the left edge of the surface. For vertically oriented steel, the y-coordinate is measured from the bottom of the steel, which is the floor surface for samples SM-IO through SM-12. If the coordinate is labeled "Edge", the probe will be placed at the edge of the surface. Since the surface of SM-1 is 5 cm wide, the probe will be centered on the surface.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 20 of 40 Survey Unit FH 18 Fan House - 1st Floor, Roof Support Steel, Section 1 I

SM SM SM SML t

1 FH-1-18 AREA: Fan House Ist Floor: Roof Support Steel, Section 1 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (iM) dpmn/1OOcm 2 Type Notes Edge 0.7 SM-1 97 Systematic N/A Centered 1.4 SM-2 91 Systematic N/A Edge 1.4 SM-3

-74 Systematic N/A Edge 1.4 SM-4 6

Systematic N/A Edge 1.4 SM-5 29 Systematic N/A Edge 1.4 SM-6 51 Systematic N/A Edge 4.8 SM-7 74 Systematic N/A Edge 4.8 SM-8 286 Systematic N/A Centered 4.8 SM-9 23 Systematic N/A Edge 4.8 SM-10 109 Systematic N/A Edge 4.8 SM-1 1 149 Systematic N/A These steel roof support beams consist of 3 beams that run East-West and 10 beams that run North-South. The fold-out, or flat, map view can be visualized by looking at the beam facing North (for the N-S beams) or East (for the E-W beams), and unfolding the beam in a clockwise manner, starting from the top of the beam.

The y-coordinate is measured from the South edge of the N-S beams. The x-coordinate is labeled as "Edge" for sample points that fall closer to the edge of the beam than the width of the detector probe. The x-coordinate is labeled "Centered" for points SM-1 and SM-9, which are located on a beam surface that is 25cm wide.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 21 of 40 Survey Unit FH 19 1st Floor, Roof Support Steel, Section 2 Fan House -

I FH-1-19 AREA: Fan House let Floor: Roof Support Steel, Section 2 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpm/llOOcm 2 Type Notes Edge 0.3 SM-1 114 Systematic N/A Centered 0.3 SM-2 33 Systematic N/A Centered 0.3 SM-3

-49 Systematic N/A Centered 0.3 SM-4 146 Systematic N/A Edge 3.1 SM-5

-57 Systematic N/A Centered 3.1 SM-6 130 Systematic N/A Edge 5.8 SM-7

-41 Systematic N/A Centered 5.8 SM-8

-114 Systematic N/A Centered 5.8 SM-9 49 Systematic N/A Centered 5.8 SM-10 33 Systematic N/A Centered 5.0 SM-1 1 57 Systematic N/A These steel roof support beams consist of 3 beams that run East-West and 11 beams that run North-South. The fold-out, or flat, map view can be visualized by looking at the beam facing North (for the N-S beams) or East (for the E-W beams), and unfolding the beam in a clockwise manner, starting from the top of the beam.

The y-coordinate is measured from the South edge of the N-S beams. The x-coordinate is labeled as "Edge" for sample points that fall closer to the edge of the beam than the width of the detector probe. The x-coordinate is labeled "Centered" for points which are located either on a beam surface that is 25 cm wide (3, 4, 6, 9, 10 and 11) or is 32 cm wide (2 and 8).

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 22 of 40 Survey Unit FH 20 Fan House - 1st Floor, Roof Support Steel, Section 3

WIHJMU1WITST f

I I P.

111 IT SM-1I I

FH-1-20 AREA: Fan House 1t Floor: Roof Support Steel, Section 3 Measurement Locations and results Location I X Co-ord (m)

Y Co-ord (m) dpm/100cm2 Type Notes Centered 3.6 SM-1

-31 Systematic Surface is 25 cm wide Centered 0.5 SM-2

-41 Systematic Surface is 25 cm wide Centered 4.5 SM-3 102 Systematic Surface is 25 cm wide Edge 1.2 SM-4

-61 Systematic N/A Edge 1.2 SM-5

-51 Systematic N/A Edge 1.2 SM-6 92 Systematic N/A Edge 1.2 SM-7 184 Systematic N/A Centered 1.2 SM-8

-82 Systematic Surface is 25 cm wide Centered 4.7 SM-9 173 Systematic Surface is 10 cm wide Centered 4.7 SM-10 102 Systematic Surface is 25 cm wide Edge 4.7 SM-1 1 255 Systematic N/A Centered 4.9 SM-12 194 Systematic Surface is 7 cm wide These steel roof support beams consist of 5 beams that run East-West and 11 beams that run North-South. The fold-out, or flat, map view can be visualized by looking at the beam facing North (for the N-S beams) or East (for the E-W beams), and unfolding the beam in a clockwise manner, starting from the top of the beam.

The y-coordinate is measured from the South end of the N-S beams and the West end of E-W beams. The x-coordinate is labeled as "Edge" for sample points that fall closer to the edge of the beam than the width of the detector probe. The x-coordinate is labeled "Centered" for points which are located either on a beam surface that is 25 cm wide (1, 2, 3, 8, and 10) or is approximately the width of the detector (9 and 12).

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 23 of 40 Survey Unit FH-2-1 Fan House Basement, Floor Section 1 0

.i LJ i i

%E§~

L IQMII Iq Iau~i~i

WlWl FH-2-1 AREA: Fan House Basement, Floor Section 1 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpm/1OOcm 2 Type Notes 2.8 0.2 SM-1 1210 Systematic N/A 6.1 0.2 SM-2 3370 Systematic N/A 9.4 0.2 SM-3 950 Systematic N/A 12.7 0.2 SM-4 2010 Systematic N/A 16.0 0.2 SM-5 681 Systematic N/A 1.1 3.0 SM-6 1720 Systematic N/A 4.4 3.0 SM-7 929 Systematic N/A 7.7 3.0 SM-8 454 Systematic N/A 11.0 3.0 SM-9 504 Systematic N/A 14.4 3.0 SM-10 504 Systematic N/A 17.7 3.0 SM-11 567 Systematic N/A

All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 24 of 40 Survey Unit FH-2-2 Fan House Basement, Floor Section 2 FH-2-2 AREA: Fan House Basement, Floor Section 2 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpm1lOOcm2 Type Notes 2.5 0.1 SM-1 645 Systematic N/A 6.0 0.1 SM-2 872 Systematic N/A 9.5 0.1 SM-3 887 Systematic N/A 13.0 0.1 SM-4 1100 Systematic N/A 16.5 0.1 SM-5 837 Systematic N/A 0.8 3.1 SM-6 1180 Systematic N/A 4.3 3.1 SM-7 1300 Systematic N/A 7.8 3.1 SM-8 872 Systematic N/A 11.3 3.1 SM-9 787 Systematic N/A 14.8 3.1 SM-10 1670 Systematic N/A 18.3 3.1 SM-11 809 Systematic N/A

All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 25 of 40 Survey Unit FH-2-3 Fan House Basement, Floor Section 3 190*fi O9INNIia FH-2-3 AREA: Fan House Basement, Floor Section 3 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpmr/IOOcm 2 Type Notes 1.1 1.4 SM-1 752 Systematic N/A 3.9 1.4 SM-2 1770 Systematic N/A 6.7 1.4 SM-3 1490 Systematic N/A 9.5 1.4 SM-4 787 Systematic N/A 12.2 1.4 SM-5 1170 Systematic N/A 15.0 1.4 SM-6 1010 Systematic N/A 2.5 3.8 SM-7 837 Systematic N/A 5.3 3.8 SM-8 652 Systematic N/A 8.1 3.8 SM-9 702 Systematic N/A 10.8 3.8 SM-10 589 Systematic N/A 13.6 3.8 SM-11 738 Systematic N/A

All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 26 of 40 Survey Unit FH-2-4 Fan House Basement, Floor Section 4 r- -

FH-2-4 AREA: Fan House Basement, Floor Section 4 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpm/1OOcm 2 Type Notes 1.3 2.0 SM-1 1080 Systematic N/A 3.8 2.0 SM-2 1310 Systematic N/A 6.4 2.0 SM-3 965 Systematic N/A 8.9 2.0 SM-4 667 Systematic N/A 1.3 0.7 SM-5 3100 Systematic N/A 3.9 0.7 SM-6 1000 Systematic N/A 6.5 0.7 SM-7 1170 Systematic N/A 2.5 4.2 SM-8 667 Systematic N/A 5.1 4.2 SM-9 901 Systematic N/A 7.6 4.2 SM-1 0 858 Systematic N/A 10.2 4.2 SM-11 567 Systematic N/A

All of the sample measurements are taken from the location shown on the map.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 27 of 40 Survey Unit FH-2-5 Fan House Basement, Floor Section 5 East Sump North line M411 Measure SM-li from this point.

Stairway Floor West Sump North line North-South line Sump Room Floor

& Sump Co

H Air Monitor Room Floor Offu Measure SM-3, 4 & 5 from this point.

FH-2-6 AREA: Fan House Basement, Floor Section 5 Measurement Locations and results Location I X Co-ord (m)

Y Co-ord (m) dpml100cm 2 Type Notes 2.3 2.1 SM-1 1667 Systematic N/A 4.9 2.1 SM-2 1180 Systematic N/A 2.2 0.8 SM-3 1000 Systematic N/A 0.9 3.1 SM-4 894 Systematic N/A 2.2 5.3 SM-5 794 Systematic N/A 1.8 1.5 SM-6 688 Systematic N/A 0.5 3.6 SM-7 766 Systematic N/A 1.4 0.9 SM-8 801 Systematic N/A

-0.15 0.7 SM-9 1080 Systematic N/A 0.14 0.06 SM-10 848 Systematic N/A 0.4 0.3 SM-11 27 Systematic N/A

All of the sample measurements are taken from the location shown on the map.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 28 of 40 Survey Unit FH-2-6 Fan House Basement: Stairs and Valve Pit LffR N

ffiý

fuSMRa ZI LZI1

]

SM-I IM FH-2-6 AREA: Fan House Basement: Stairs and Valve Pit Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpm/I1OOcm2 Type Notes 0.4 0.2 SM-I

-102 Systematic N/A 0.1 0.2 SM-2 1080 Systematic N/A 1.9 0.8 SM-3 959 Systematic N/A 0.9 0.8 SM-4 1112 Systematic N/A 0.1 0.1 SM-5 61 Systematic N/A 0.4 0.1 SM-6 41 Systematic N/A 0.4 0.5 SM-7 582 Systematic N/A 0.4 2.0 SM-8 622 Systematic N/A 1.3 2.0 SM-9 612 Systematic N/A 0.1 2.0 SM-10 898 Systematic N/A 0.4 1.9 SM-1 1 704 Systematic N/A

All of the sample measurements are taken from the lower left or southwest corner of the surface on which they lie.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 29 of 40 Survey Unit FH-2-7 Fan House Basement: Wall Section 1 D1 II FH-2-7 AREA: Fan House Basement: Wall Section 1 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpm100cm2 Type Notes 2.1 0.2 SM-1 965 Systematic N/A 0.1 0.2 SM-2 723 Systematic N/A 2.7 0.2 SM-3 851 Systematic N/A 0.4 0.2 SM-4 404 Systematic N/A 3.3 0.2 SM-5 929 Systematic N/A 0.7 0.2 SM-6 716 Systematic N/A 4.4 0.2 SM-7 809 Systematic N/A 0.3 3.3 SM-8 355 Systematic N/A 3.9 3.3 SM-9 433 Systematic N/A 0.9 3.3 SM-10 972 Systematic N/A 4.5 3.3 SM-1 1 745 Systematic N/A 1.5 3.3 SM-12 695 Systematic N/A 5.1 3.3 SM-13 738 Systematic N/A 2.6 3.3 SM-14 929 Systematic N/A 0.2 3.3 SM-15 801 Systematic N/A

All of the sample measurements are taken from the lower left comer of the surface on which they lie.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 30 of 40 Survey Unit FH-2-8 Fan House Basement: Wall Section 2 E© FH-2-8 AREA: Fan House Basement: Wall Section 2 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpm/100cm2 Type Notes 0.3 0.5 SM-1 1040 Systematic N/A 1.1 0.5 SM-2 367 Systematic N/A 1.5 0.5 SM-3 878 Systematic N/A 0.2 0.5 SM-4 724 Systematic N/A 0.2 0.5 SM-5 837 Systematic N/A 3.2 0.5 SM-6 194 Systematic N/A 1.8 3.1 SM-7 653 Systematic N/A 2.5 3.1 SM-8 571 Systematic N/A 1.7 3.1 SM-9 918 Systematic N/A 4.6 3.1 SM-10 490 Systematic N/A 2.0 3.1 SM-11 245 Systematic N/A

All of the sample measurements are taken from the lower left corner of the surface on which they lie.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 31 of 40 Survey Unit FH-2-9 Fan House Basement: Wall Section 3 m--- m---

0.

0 0

4-~

I

%EEI FH-2-9 AREA: Fan House Basement: Wall Section 3 Measurement Locations and results Location I X Co-ord (m)

Y Co-ord im dp)m/1I00cm 2 Type Notes 2.0 0.1 SM-1 1030 Systematic N/A 5.4 0.1 SM-2 1160 Systematic N/A 0.1 0.1 SM-3 1060 Systematic N/A 3.6 0.1 SM-4 636 Systematic N/A 0.5 0.1 SM-5 1110 Systematic N/A 0.2 3.1 SM-6 673 Systematic N/A 3.7 3.1 SM-7 900 Systematic N/A 0.7 3.1 SM-8 418 Systematic N/A 1.8 3.1 SM-9 636 Systematic N/A 5.3 3.1 SM-10 755 Systematic N/A 2.2 3.1 SM-11 909 Systematic N/A

All of the sample measurements are taken from the lower left comer of the surface on which they lie.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 32 of 40 Survey Unit FH-2-10 Fan House Basement -Walls of Stairway and Air Monitor Room Stairway Air Monitor Room FH-2-10 AREA: Fan House Basement Walls of Stairway and Air Monitor Room Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpm/1OOcm 2 Type Notes 2.9 0.2 SM-1 1060 Systematic N/A 0.1 0.2 SM-2 830 Systematic N/A 3.9 0.2 SM-3 943 Systematic N/A 2.3 0.2 SM-4 468 Systematic N/A 1.3 0.2 SM-5 837 Systematic N/A 1.4 0.2 SM-6 929 Systematic N/A 5.2 0.2 SM-7 979 Systematic N/A 1.0 0.2 SM-8 752 Systematic N/A 1.1 3.5 SM-9 780 Systematic N/A 0.2 3.5 SM-10 823 Systematic N/A 2.0 3.5 SM-11 716 Systematic N/A 1.6 3.5 SM-12 525 Systematic N/A 0.4 3.5 SM-13 440 Systematic N/A 4.2 3.5 SM-14 936 Systematic N/A

All of the sample measurements are taken from the lower left comer of the surface on which they lie.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 33 of 40 Survey Unit FH-2-11 Fan House Basement - Sump Room Walls r--

Sump Room nF FH-2-11 AREA: Fan House Basement: Sump Room Walls Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpml1lOOcm 2 Type Notes 0.5 0.2 SM-1 702 Systematic N/A 0.6 0.2 SM-2 504 Systematic N/A 1.1 0.2 SM-3 922 Systematic N/A 4.2 0.2 SM-4 915 Systematic N/A 2.1 0.2 SM-5 660 Systematic N/A 1.9 0.2 SM-6 560 Systematic N/A 4.9 0.2 SM-7 461 Systematic N/A 1.8 0.2 SM-8 617 Systematic N/A 2.1 2.9 SM-9 716 Systematic N/A 2.2 2.9 SM-10 660 Systematic N/A 0.3 2.9 SM-11 518 Systematic N/A

All of the sample measurements are taken from the lower left comer of the surface on which they lie.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 34 of 40 Survey Unit FH-2-12 Fan House Basement - Ceiling Section 1 I

Li Li IL SM0 H

H FH-2-12 AREA: Fan House Basement: Ceiling Section 1 Measurement Locations and results Location I X Co-ord (m)

Y Co-ord (m) dpm/lOOcm 2 Type Notes 1.3 1.3 SM-1 864 Systematic N/A 4.4 1.3 SM-2 1270 Systematic N/A 7.4 1.3 SM-3 673 Systematic N/A 10.5 1.3 SM-4 655 Systematic N/A 16.7 1.3 SM-5 745 Systematic N/A 2.8 4.0 SM-6 764 Systematic N/A 5.9 4.0 SM-7 400 Systematic N/A 9.0 4.0 SM-8 600 Systematic N/A 12.1 4.0 SM-9 727 Systematic N/A 15.1 4.0 SM-10 900 Systematic N/A 18.2 4.0 SM-11 564 Systematic N/A

All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 35 of 40 Survey Unit FH-2-13 Fan House Basement - Ceiling Section 2 I

SM-I ýI SM0 FH-2-13 AREA: Fan House Basement: Ceiling Section 2 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord im) dpm/1OOcm 2 Type Notes 2.6 1.6 SM-1 1080 Systematic N/A 5.8 1.6 SM-2 445 Systematic N/A 9.0 1.6 SM-3 236 Systematic N/A 12.3 1.6 SM-4 1040 Systematic N/A 15.5 1.6 SM-5 555 Systematic N/A 1.0 4.4 SM-6 836 Systematic N/A 4.2 4.4 SM-7 973 Systematic N/A 7.4 4.4 SM-8 1060 Systematic N/A 10.7 4.4 SM-9 664 Systematic N/A 13.9 4.4 SM-10 709 Systematic N/A 17.1 4.4 SM-11 527 Systematic N/A

All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 36 of 40 Survey Unit FH-2-14 Fan House Basement - Ceiling Section 3

_1 ISM4l "FiK9 Il FH-2-14 AREA: Fan House Basement: Ceiling Section 3 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpm/1OOcm 2 Type Notes 2.6 1.6 SM-1 673 Systematic N/A 5.8 1.6 SM-2 627 Systematic N/A 9.0 1.6 SM-3 273 Systematic N/A 12.3 1.6 SM-4 336 Systematic N/A 15.5 1.6 SM-5 1130 Systematic N/A 1.0 4.4 SM-6 664 Systematic N/A 4.2 4.4 SM-7 873 Systematic N/A 7.4 4.4 SM-8 491 Systematic N/A 10.7 4.4 SM-9 845 Systematic N/A 13.9 4.4 SM-10 764 Systematic N/A 17.1 4.4 SM-1I 464 Systematic N/A

All of the sample measurements are taken from the southwest corner of the survey unit.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 37 of 40 Survey Unit FH-2-15 Fan House Basement - Ceiling Section 4 OH 4

Measure SM-2, 3, 6, 7, and 8 from this point.

Measure SM-II from this point.

Measure SM-10 from this point.

SM4 Measure SM-4 from this point.

Measure SM-1 and 9 from this point. -

11-1 Measure SM-S from this point.

FH-2-16 AREA: Fan House Basement: Ceiling Section 4 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpm/1OOcm 2 Type Notes 0.7 0.1 SM-1 571 Systematic N/A 1.9 0.3 SM-2 837 Systematic N/A 4.3 0.3 SM-3 908 Systematic N/A 1.1 2.2 SM-4 776 Systematic N/A 0.1 2.2 SM-5 939 Systematic N/A 0.7 2.4 SM-6 776 Systematic N/A 3.1 2.4 SM-7 592 Systematic N/A 5.5 2.4 SM-8 582 Systematic N/A 0.7 4.2 SM-9 888 Systematic N/A 0.1 3.9 SM-10 337 Systematic N/A 1.0 0.6 SM-11 602 Systematic N/A

Sample measurements are taken from the locations shown on the map.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 38 of 40 Survey Unit FH-2-16 Fan House Basement - Support Steel, Section 1 L iU[IL-N SM F

"M SM FSM-_19 FH-2-16 AREA: Fan House Basement: Support Steel, Section 1 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpml100cm 2 Type Notes 0.27 0.50 SM-1 221 Systematic Beam section =0.36m wide 0.23 4.6 SM-2

-27 Systematic Beam section =0.36m wide 0.19 1.20 SM-3 82 Systematic Beam section =0.47m wide 0.19 509 SM-4 155 Systematic Edge 3.7 SM-5 245 Systematic Beam section =0.47m wide Edge 0.5 SM-6 136 Systematic Beam section =0.47m wide Edge 5.2 SM-7 155 Systematic 0.23 2.7 SM-8

-73 Systematic Beam section =0.36m wide Edge 2.7 SM-9 209 Systematic Beam section =0.08m wide 0.32 2.7 SM-10

-100 Systematic Beam section =0.41m wide 0.26 2.7 SM-11 91 Systematic Beam section =0.41m wide These steel floor support beams consist of 4 beams that run East-West and 10 beams that run North-South. The fold-out, or flat, map view can be visualized by looking at the beam facing North (for the N-S beams) or East (for the E-W beams), and unfolding the beam in a clockwise manner, starting from the top of the beam.

The y-coordinate is measured from the South end of the N-S beams and the West end of E-W beams. The x-coordinate is measured from the left or top edge of the surface, as shown in the fold-out map view. The x-coordinate is labeled as "Edge" for sample points that fall closer to the edge of the beam than the width of the detector probe.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 39 of 40 Survey Unit FH-2-17 Fan House Basement - Support Steel, Section 2

--iF rlr-FL HIll I

I FH-2-17 AREA: Fan House Basement: Support Steel, Section 2 Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpm/1OOcm2 Type Notes 0.08 2.3 SM-1 118 Systematic Beam section = 0.20m wide Edge 1.2 SM-2 91 Systematic Column section = 0.10m wide 0.39 3.0 SM-3 73 Systematic Beam section = 0.46m wide 0.35 0.4 SM-4 345 Systematic Beam section = 0.46m wide 0.35 5.1 SM-5 109 Systematic 0.39 1.8 SM-6 436 Systematic Beam section =0.46m wide Edge 1.8 SM-7 218 Systematic Beam section =0.35m wide 0.25 1.8 SM-8 300 Systematic Beam section =0.35m wide Edge 3.5 SM-9

-136 Systematic Column section = 0.10m wide 0.28 5.8 SM-10 45 Systematic Beam section = 0.35m wide 0.24 5.8 SM-1 1 73 Systematic Beam section = 0.35m wide 0.19 5.8 SM-12 27 Systematic Beam section = 0.31m wide These steel floor support beams consist of 3 beams that run East-West, 12 beams that run North-South, and 4 columns. The fold-out, or flat, map view can be visualized by looking at the beam (or column) facing North (for the N-S beams) or East (for the E-W beams), and unfolding the beam in a clockwise manner, starting from the top of the beam.

The y-coordinate is measured from the South end of the N-S beams, the West end of E-W beams, and the base of the columns. The x-coordinate is measured from the left or top edge of the surface, as shown in the fold-out map view. The x-coordinate is labeled as "Edge" for sample points that fall closer to the edge of the beam than the width of the detector probe.

Plum Brook Reactor Facility FSSR, Attachment 3 Appendix B Rev. 0, Page 40 of 40 Survey Unit FH-4-1 Fan House Exterior - Concrete Walls

ffu West Wall South Wall FH I AREA: FHB - Exterior Concrete Wall Measurement Locations and results Location /

X Co-ord (m)

Y Co-ord (m) dpm/1OOcm2 Type Notes 1.1 0.1 SM-1 1010 Systematic N/A 3.6 0.1 SM-2 938 Systematic N/A 2.2 0.1 SM-3 527 Systematic N/A 4.8 0.1 SM-4 863 Systematic N/A 2.4 2.3 SM-5 699 Systematic N/A 1.0 2.3 SM-6 1110 Systematic N/A 3.5 2.3 SM-7 1090 Systematic N/A 6.1 2.3 SM-8 1250 Systematic N/A 1.1 4.5 SM-9 1340 Systematic N/A 3.6 4.5 SM-10 1230 Systematic N/A 2.2 4.5 SM-11 1220 Systematic N/A 4.8 4.5 SM-12 1550 Systematic N/A

All of the sample measurements are taken from the lower left corner of the wall surface on which they rest.

ML102030280

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the type II error probability, ZI-, = proportion of standard normal distribution < I - a (1.6449 for a

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ML102030280

Text

Subject:

Title:

the type II error probability, ZI-, = proportion of standard normal distribution < I - a (1.6449 for a

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