ML23136B286
| ML23136B286 | |
| Person / Time | |
|---|---|
| Site: | 07000398 |
| Issue date: | 04/25/2023 |
| From: | Jones P US Dept of Commerce, National Institute of Standards & Technology (NIST) |
| To: | Office of Nuclear Material Safety and Safeguards |
| Shared Package | |
| ML23136B277 | List: |
| References | |
| TAC L32643, EPID L-2022-DFA-0010 | |
| Download: ML23136B286 (1) | |
Text
Radiological Scoping Study Report for the National Institute of Standards and Technology ReNuke #NIST-TR-23-002 (Perma-Fix #144276-RPT-002)
National Institute of Standards and Technology (NIST) 100 Bureau Drive Gaithersburg, MD REVISION: Original Approvals:
Prepared By: __________________________ ________________________
04/25/2023 Paul Jones, RRPT Date Reviewed By: __________________________ ________________________
04/25/2023 Jeffrey Knight, RRPT Date Reviewed By: __________________________ 04/25/2023 Ryan Larochelle, RRPT Date Approved By: __________________________ ________________________
04/25/2023 Ian Howard Date
Scoping Report: NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page ii of iv TABLE OF CONTENTS
- 1.
SUMMARY
........................................................................................................................ 1
- 2. SITE LOCATION AND HISTORICAL RADIOLOGICAL DESCRIPTION .................. 2 2.1 NIST Background ................................................................................................... 3 2.2 Historical Radiological Activities ........................................................................... 3
- 3. INVESTIGATION CRITERIA .......................................................................................... 3
- 4. SURVEY INSTRUMENTATION ..................................................................................... 4 4.1 Instrument Calibration ............................................................................................ 4 4.2 Daily Response Checks........................................................................................... 4 4.3 Determination of Counting Times and Minimum Detectable Concentrations ....... 4 4.3.1 Static Counting............................................................................................ 5 4.3.2 Ratemeter Scanning .................................................................................... 5 4.3.3 Removable Contamination Measurement Counting ................................... 6 4.4 Instrumentation Specifications................................................................................ 7
- 5. SCOPING SURVEYS ........................................................................................................ 8
- 6. SCOPING SURVEY DESIGN ........................................................................................... 9 6.1 Data Quality Objectives .......................................................................................... 9 6.2 Survey Area Identification and Classification. ....................................................... 9 6.3 Surface Scans ........................................................................................................ 11 6.4 Background Determination ................................................................................... 11 6.5 Total Surface Activity Measurements .................................................................. 11 6.6 Determining the Number of Sample Locations .................................................... 11 6.7 Determination of Sampling Locations .................................................................. 12 6.8 Removable Contamination Measurements ........................................................... 12 6.9 Data Validation ..................................................................................................... 12
- 7. CONTAMINATION
SUMMARY
RESULTS................................................................. 12
- 8. REFERENCES ................................................................................................................. 21 LIST OF TABLES Table 1. Instrumentation Specifications ......................................................................................... 8 Table 2. Instrument Operating Parameters and Sensitivities .......................................................... 8 Table 3. Scoping Survey Areas ..................................................................................................... 10 Table 4. Contamination Summary ............................................................................................... 12
Scoping Report: NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page iii of iv LIST OF FIGURES Figure 1. Location of NIST Facilities ............................................................................................. 2 Appendix A. Scoping Survey Calibration Sheets Appendix B. Scoping Surveys Appendix C. Liquid Scintillation Results Appendix D. Tennelec Results
Scoping Report: NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page iv of iv LIST OF ACRONYMS AND SYMBOLS cm2 square centimeter cpm counts per minute DQO Data Quality Objective dpm disintegrations per minute HSA Historical Site Assessment m meter m2 square meter MARSSIM Multi-Agency Radiation Survey and Site Investigation Manual MDC Minimum Detectable Concentration NIST National Institute of Standards and Technology Perma-Fix Perma-Fix Environmental Services, Inc.
ReNuke ReNuke Services, Inc.
RSD Radiation Safety Division
Scoping Report: NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 1 of 16
- 1.
SUMMARY
The National Institute of Standards and Technology (NIST), headquartered in Gaithersburg, Maryland, contracted ReNuke Services, Inc. who teamed with Perma-Fix Environmental Services to develop facility decommissioning cost estimates (DCEs) for their non-reactor radiological facilities in Gaithersburg. As part of the DCE the ReNuke Services team performed a Historical Site Assessment (HSA) (see report #NIST-TR-23-001, NIST Historical Site Assessment (2023).
The conclusions of the HSA identified 22 rooms requiring radiological scoping surveys. This report describes the summary of the scoping study performed as part of the DCE activities.
The team designed and implemented the scoping surveys using the guidance of the Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM) such that the quality of the data produced would be suitable for use in determining MARSSIM classification.
During October and November 2022, The ReNuke Services Team (Consisting of ReNuke Services, Inc and Perma-Fix Environmental Services, Inc.) performed scoping surveys for characterization of the following areas of the NIST facility:
Building 245 Rooms: H119, H208, H214, H220, H221, H229, H233, H104, H120, and H113-4.
Building 227 Rooms: A334, B343-1, B345, and B353 Building 217 Rooms: C115 and D105 Building 224 Room A306 Building 226 Room B159 Building 221 Room B43 Building 245 Rooms B200, G104, and G105 The results of the survey identified 14 rooms with no elevated activity above investigation levels (rooms H214, H220, H221, H229, H233, H120, B343-1, B345, C115, D105, A306, B159, B43, and G104).
In addition, the survey identified 6 rooms with elevated fixed activity above investigation criteria (H208, H104, A334, B353, B200 and G105). The elevated readings in room H113-4 were due to known adjacent sources and therefore is not expected to have contamination.
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 2 of 16
- 2. SITE LOCATION AND HISTORICAL RADIOLOGICAL DESCRIPTION The NIST facility is located at 100 Bureau Drive, Gaithersburg, MD 20899.
Figure 1. Location of NIST Facilities
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 3 of 16 2.1 NIST Background The National Institute of Standards and Technology (NIST) was founded in 1901 and is now part of the U.S. Department of Commerce. NIST is one of the nation's oldest physical science laboratories. Congress established the agency to remove a major challenge to U.S. industrial competitiveness at the time a second-rate measurement infrastructure that lagged behind the capabilities of the United Kingdom, Germany and other economic rivals.
From the smart electric power grid and electronic health records to atomic clocks, advanced nanomaterials and computer chips, innumerable products and services rely in some way on technology, measurement and standards provided by the National Institute of Standards and Technology.
Today, NIST measurements support the smallest of technologies to the largest and most complex of human-made creations from nanoscale devices so tiny that tens of thousands can fit on the end of a single human hair up to earthquake-resistant skyscrapers and global communication networks.
2.2 Historical Radiological Activities Special Nuclear material (SNM) License SNM-362 was first issued in 1960 by the Atomic Energy Commission to the National Bureau of Standards (renamed as the National Institute of Standards and Technology (NIST) in 1988). NIST is a federal agency within the Department of Commerce.
NIST uses licensed materials for research, development, calibration, and testing activities. Under SNM-362, NIST develops, maintains, and disseminates national standards for ionizing radiation and radioactivity to support health care, industry, and homeland security at its Gaithersburg, MD, site.
License SNM-362 was renewed in 1979, 1985, 1991, 1997 and 2007. The current license, which also recognizes NIST as a Type A Broad Scope License, was scheduled to expire on July 31, 2007.
On June 29, 2007, NIST submitted an application requesting renewal of license SNM-362 for a period of ten years, under Title 10 of the Code of Federal Regulations (10 CFR) Part 70, to continue its authorization to possess and use SNM.
- 3. INVESTIGATION CRITERIA The criteria for formal investigation of the scoping surveys are those specified in Nuclear Regulatory Commission (NRC) Regulatory Guide -1.86, Termination of Operating Licenses for Nuclear Reactors. Acceptable Surface Contamination Levels. It is understood that this regulatory Guide has been withdrawn, however the limitations presented in this table are more restrictive then those recommended in Appendix H of NUREG-1757 Vol 2 and are widely known and recognized standards across NRC regulated sites.
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 4 of 16 Based on the radionuclides identified on the inventory that were in a dispersible form at NIST, the alpha total activity release limit is 100 dpm/100 cm2 and the beta-gamma total activity release limits is 1,000 dpm/100 cm2 (based on Sr-90). Removable activity limits for alpha and beta-gamma emitters are 20 dpm/100 cm2 and 200 dpm/100 cm2, respectively.
In addition to the above investigation criteria the minimum detectable concentrations (MDC) for the surveys were optimized and any levels exceeding MDC are noted on the surveys and discussed in section 7.0 of this report.
- 4. SURVEY INSTRUMENTATION Based on potential contaminants, their associated radiation, and the types of residual contamination categories to be evaluated, the detection sensitivities of various instruments and techniques were evaluated for use. Instruments were evaluated for use during surface scans, direct measurements, and analysis of removable contamination wipes.
4.1 Instrument Calibration Laboratory and portable field instruments are calibrated at least annually with National Institute of Standards and Technology (NIST) traceable sources and to radiation emission types and energies that provide detection capabilities similar to the nuclides of concern.
4.2 Daily Response Checks A reference source was measured prior to use each day, and the results were verified accurate within +/-20% of originally determined values. This is consistent with the guidance in Section 6.5.4 of MARSSIM, Instrument Calibration. Background readings were taken as part of the daily response checks and compared with the acceptance range for instrument and site conditions. The LSC counter was operated by NIST personnel according to their procedures. The system is normalized daily using its SNC protocol.
All instruments passed daily response tests within +/-20% of originally determined values.
4.3 Determination of Counting Times and Minimum Detectable Concentrations Minimum counting times for background determinations and counting times for measurement of total and removable contamination were chosen to provide the optimum minimum detectable concentrations (MDCs) based on the historical radionuclides that would still be present today and used in unsealed forms. Count times and scanning rates were determined using the equations in the following sections.
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 5 of 16 4.3.1 Static Counting Static counting MDC at a 95% confidence level was calculated using the following equation, which is an expansion of NUREG-1507, Minimum Detectable Concentrations with Typical Radiation Survey Instruments for Various Contaminants and Field Conditions, Table 3.1 (Strom
& Stansbury, 1992):
3 + 3.29 (1 +
)
=
1002 Where:
MDCstatic = minimum detectable concentration level in dpm/100 cm2 Br = background count rate in counts per minute tb = background count time in minutes ts = sample count time in minutes Etot = total detector efficiency for radionuclide emission of interest (includes combination of instrument efficiency and surface efficiency)1 A = detector probe area in cm2
- 1. Surface efficiency applied was in accordance with the recommended values of 0.25 for alpha and beta emitters <400 keV max and 0.5 for all others.
In addition to the above formula, the MDCR formula is provided below:
3 + 3.29 1 +
=
4.3.2 Ratemeter Scanning Scanning MDC at a 95% confidence level was calculated using the following equation which is a combination of MARSSIM equations 6-8, 6-9, and 6-10:
60
=
1002 Where:
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 6 of 16 MDCscan = minimum detectable concentration level in dpm/100 cm2 d = desired performance variable (1.38) bi = background counts during the residence interval I = residence interval P = surveyor efficiency (0.5)
Etot = total detector efficiency for radionuclide emission of interest (includes combination of instrument efficiency and surface efficiency1)
A = detector probe area in cm2 1
Surface efficiency applied was in accordance with the recommended values of 0.25 for alpha and beta emitters <400 keV max and 0.5 for all others.
4.3.3 Removable Contamination Measurement Counting Removable contamination measurement (smear) counting Minimum Detectable Concentration at a 95% confidence level was calculated using the following equation, which is NUREG-1507, Minimum Detectable Concentrations with Typical Radiation Survey Instruments for Various Contaminants and Field Conditions, Table 3.1 (Strom & Stansbury, 1992):
3 + 3.29 (1 +
)
=
1002 Where:
MDCsmear = minimum detectable concentration level in dpm/smear Br = background count rate in counts per minute tb = background count time in minutes ts = sample count time in minutes E = instrument efficiency for radionuclide emission of interest A = physical area of the smear in cm2 A typical MDCsmear calculation for the tennelec in the beta channel is shown below:
2 3 + 3.291.2 2 (1 + 60)
= = 10.46 /1002 100 2 2 0.3910 1002
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 7 of 16 4.4 Instrumentation Specifications The instrumentation used for facility scoping surveys is summarized in the following tables. Table 1 lists the standard features of each instrument such as probe size and efficiency. Table 2 lists the typical operational parameters such as scan rate, count time, and the associated MDCs.
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 8 of 16 Table 1. Instrumentation Specifications Detector Detector Meter Window Detector Model Typical Total Efficiency Type Area Model Thickness Alpha/Beta 0.8 14 % (Tc-99) - Beta Ludlum 43-93 100 cm2 Ludlum 2360 Scintillation mg/cm2 18.7% (Th-230) - Alpha Alpha/Beta Canberra 0.8 25% - Alpha Gas Flow 5.7 cm² Series 6LB Tennelec mg/cm2 39% - Beta Proportional Liquid Tri-Carb 60.67% H-3 Tri-Carb 2910 100 cm2 N/A Scintillation 2910 92.01% C-14 Sodium Ludlum 44-10 N/A Ludlum 2221 N/A N/A Iodide Table 2. Instrument Operating Parameters and Sensitivities Measurement Detector Meter Scan Count Background Typical MDC Type Model Model Rate Time (cpm) (dpm/100 cm2)
<5 Ludlum 3 1,838 - Beta Surface Scans 43-93 N/A Alpha/<300 2360 cm/sec. N/A - Alpha Beta-Gamma (NaI) Tissue Bicron Dose Rate N/A N/A 3 rem/hr 1 rem/hr Equivalent micro Rem Total Surface Ludlum 120 686 - Beta 43-93 N/A 400 Activity 2360 sec. 41 - Alpha Removable 57 mm Gas 120 1.2 - Beta 10 - Beta Alpha/Beta Flow Series 6LB N/A sec. 0.2 - Alpha 11 - Alpha Activity Proportional Removable TriCarb 300 6 - H-3 28 - H-3 H-3/C-14 N/A N/A 3110 TR sec. 11 - C-14 38 - C-14 Activity Note: Alpha scanning is determined using a calculated probability rate of the technician hearing an alpha click during the scan and stopping to see if it is repeated.
Calibration certificates for the instruments used for the surveys discussed in this report are provided in Appendix A.
- 5. SCOPING SURVEYS A scoping survey was performed on the building surfaces and fixed equipment within the rooms.
The scoping survey was performed to identify and quantify residual activity above background.
Surface scanning, surface activity (static) measurements, and sample collection (smears) were performed to characterize building structural surfaces, including permanently installed counters and casework.
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 9 of 16 In addition to building surfaces, the permanently installed equipment (e.g., casework, benchtops, and fume hoods, hood-ducts, etc.) were surveyed in accessible areas. Drains were limited to removable contamination measurements due to their small geometry. That is, these systems were not intrusively inspected (severed) solely for the purpose of surveying.
- 6. SCOPING SURVEY DESIGN Scoping surveys were performed to demonstrate that residual radioactivity in each area was identified per the investigation criteria identified in section 3.0 above. The scoping surveys were conducted using the Data Quality Objective (DQO) process.
Scoping surveys were conducted by performing scan surveys, total direct surveys, and removable contamination measurements. All survey data was documented on survey maps and associated data information sheets.
6.1 Data Quality Objectives The process of designing a scoping survey begins with development of DQOs. On the basis of these objectives and the known or anticipated radiological conditions at the site, survey techniques appropriate to develop adequate data were selected and implemented.
- 1) Perform survey techniques adequate to support the preliminary MARSSIM classification based on the HSA and the latest Health Physics Database and satisfy the Investigation Criteria per section 3.0.
- 2) Investigate the ventilation and radiological drainage systems, as necessary.
- 3) Provide sufficient results to aid in a successful DCE.
The major data quality objective for the survey was to perform the survey techniques adequate to support the preliminary MARSSIM classification based on the HSA and the latest Health Physics Database.
In addition, count times were selected to provide the most reasonable survey time for the radionuclides of interest. Static count times and scan speeds are provided on each survey found in Appendix B.
6.2 Survey Area Identification and Classification.
The following survey areas were identified for survey based on the historical license and document review performed during the HSA.
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 10 of 16 Table 3. Scoping Survey Areas Building, Survey Number Preliminary Lab Description/Use/History Room # Classification BLDG 245, NIST-22-10-25-01 Impacted Class 2 H119-1, Equipment storage RM H119 H119-2, Equipment and temp. storage (sealed RAM box)
H119-3 Detector testing and cal. using radioactive sources BLDG 245, NIST-22-10-25-02 Impacted Class 1 Unsealed Source Usage, Medium Level RM H208 Environmental BLDG 245, NIST-22-10-25-03 Impacted Class 3 Unsealed Liquid, Use High Level RM H214 Chemistry Source Prep, Dilution, Dispensing & Storage BLDG 245, NIST-22-10-25-04 Impacted Class 3 Alpha and Beta Measurements, Sealed RM H220 & Unsealed sources BLDG 245, NIST-22-10-25-05 Impacted Class 3 User Contamination Check Room RM H221 Counting Lab.
BLDG 245, NIST-22-10-25-06 Impacted Class 1 High/Medium SRM, RM H229 BLDG 245, NIST-22-10-25-07 Impacted Class 1 Low level Radiochemistry Prep.
RM H233 BLDG 245, NIST-22-10-26-01 Impacted Class 1 HP Sample Prep. Laboratory RM H104 BLDG 245, NIST-22-10-26-02 Impacted Class 3 Health Physics sample measurement RM H120 lab.
BLDG 245, NIST-22-10-26-03 Impacted Class 3 Source Receiving and Processing of RM H113-4 In/Out Packages BLDG 227, NIST-22-11-01-01 Impacted Class 1 solid sealed: Pb-210. Solid: Pb-210, U-RM A334 238, HEU, Th-nat. Powder - U-nat.
Liquid: HEU, Pb-210, U-233, Th-230 BLDG 227, NIST-22-11-01-02 Impacted Class 3 Clean Room, Decommissioned by RSD RM B343-1 BLDG 227, NIST-22-11-01-03 Impacted Class 1 Solid: Pb-210, liquid: I-129 authorized RM B345 but not used.
BLDG 227, NIST-22-11-01-04 Impacted Class 1 Solid: Pb-210. Liquid: Pb-210 RM B353 Clean Room, Decommissioned by RSD BLDG 217, NIST-22-11-03-01 Impacted Class 3 Surface and Microanalysis, Unsealed RM C115 TRU, U, Th Mass Spec contamination with Uranium BLDG 217, NIST-22-11-03-02 Impacted Class 3 Sealed/Unsealed Pu-239, HEU, Unat, RM D105 Gd-109, Pu-238, DU, Cs-137 sealed BLDG 224, NIST-22-11-04-01 Impacted Class 3 Cellulose naNO material handling lab.,
RM A306 C-14 liquid unsealed BLDG 226, NIST-22-11-04-02 Impacted Class 3 Mixed Byproduct with solid material RM B159 storage only (Cs-137 & Co-60)
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 11 of 16 Building, Survey Number Preliminary Lab Description/Use/History Room # Classification BLDG 221, NIST-22-11-08-01 Impacted Class 3 Solid Material Unat, Powder Unat, RM B43 Liquid DU, Sealed Unat, DU, & Fe-55 BLDG 245, NIST-22-11-09-01 Impacted Class 3 (G104) G-105 has known activation from linear RM G104 & Accelerator. G-104 Received an ATL
& Impacted Class 1 (G105) clearance after our survey.
RM G105 BLDG 245, NIST-22-11-10-01 Impacted Class 1 HVAC Room (Supporting B-wing RM B200 Contaminated Filter Banks)
MARSSIM states that survey units should be limited in size based on classification, exposure pathway modeling assumptions, and site-specific conditions. MARSSIM also suggests size limitations, which for Class 1 structural surfaces is 100 m2 or less and Class 2 structural surfaces 100 to 1000 m2. The survey units are within acceptable tolerance relative to these size recommendations.
6.3 Surface Scans Scanning was used to identify locations within the survey area that exceed the investigation level.
In addition, any areas detectable above general area background were noted on the surveys as well.
Scanning surveys were designed to detect small areas of elevated activity that are not detected by field static measurements.
6.4 Background Determination An ambient background measurement taken at waist level in the center of each area was used. The ambient background value was subtracted from the applicable gross measurement count rates (in cpm) to determine the net measurement count rate.
6.5 Total Surface Activity Measurements Direct surveys (static measurements) were performed on building surfaces and inside the exhaust hoods to the extent practical in impacted areas utilizing instrumentation of the best geometry based on the surface at the survey location.
Total surface contamination measurements for gross alpha and gross beta were taken at biased sample locations. The results of these measurements are provided in Appendix B.
6.6 Determining the Number of Sample Locations The initial number of sample locations for each survey area was selected at random and/or at biased sample locations using professional judgement.
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 12 of 16 6.7 Determination of Sampling Locations Survey Maps showing the sample locations are provided in the actual survey documentation provided in Appendix B.
6.8 Removable Contamination Measurements Removable contamination measurements (smears) were collected on building surfaces and structures at each total activity sample location to determine the potential removable contamination. Additionally, removable contamination measurements were collected in the drains and hoods.
6.9 Data Validation Field data was reviewed and validated to ensure:
- Completeness of forms,
- The correct type of survey was assigned to the survey area,
- The MDCs for measurements met the established data quality objectives; independent calculations were performed for a representative sample of data sheets and survey areas,
- Instrument calibrations and daily functional checks were performed accurately and at the required frequency.
- 7. CONTAMINATION
SUMMARY
RESULTS The following table summarizes the scoping surveys in Appendix B for purposes of any elevated activity in scoping study of rooms. The contamination summary in the table corresponds to fixed contamination unless otherwise specified. Unless otherwise noted, the area of elevated activity is approximately 100 cm2.
Table 4. Contamination Summary Survey ID Fixed Above Room Building Number Investigation Contamination Summary (Laboratory)
NIST- Criteria (1) Location > MDC (Spot # 12)
No Alpha (0) Locations > Reporting Criteria.
Highest Reading: 64 dpm/100 cm2 245 22-10-25-01 H119 (1) Location >MDC (Spot #17)
See Beta/
(1) Location >Reporting Criteria (Spot# 12)
Notes Gamma Highest Reading: See Notes
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 13 of 16 Survey ID Fixed Above Room Building Number Investigation Contamination Summary (Laboratory)
NIST- Criteria Preliminary Class 2 No Class change as a result of this survey.
NOTES: No Removable Activity Identified. Elevated Fixed Alpha and Beta/Gamma activity was identified on a <1 ft2 area of the floor and elevated Alpha activity was also identified on a countertop. All Activity was below the investigation limit except for location #12. A follow-on scan of this area performed by NIST RSD resulted in activity consistent with background variances. It was expressed by NIST RSD that this slightly elevated reading (~300 cpm above background ReNuke Result) could possibly have been due to operation of the LINAC below this room.
(2) Location > MDC (# 18 & 21)
Yes Alpha (1) Locations > Investigation Levels. (#18)
Highest Reading: 310 dpm/100 cm2 245 22-10-25-02 H208 (1) Location >MDC (#18)
Beta/
Yes (1) Location >Investigation Levels (#18)
Gamma Highest Reading: 2084 dpm/100 cm2 Preliminary Class 1 No Class change as a result of this survey.
NOTES: No Removable Activity Identified. Elevated Fixed Alpha and Beta/Gamma activity was identified inside one of the rooms hoods, on <1 ft2 upper horizontal surface. Elevated Fixed Alpha activity was also identified inside another hood. See map for specific location. All Activity was below the investigation limit except for location #18 (310 dpm/100 cm Alpha &
2084 dpm/100 cm2 Beta/Gamma) found inside the hood. See map for specific location.
(2) Location > MDC (# 25 & 26)
No Alpha (0) Locations > Investigation Levels.
Highest Reading: 54 dpm/100 cm2 245 22-10-25-03 H214 (0) Location >MDC Beta/
No (0) Location >Investigation Levels Gamma Highest Reading: <MDC Preliminary Class 1 No Class change as a result of this survey.
NOTES: No Removable Activity Identified. Elevated Fixed Alpha activity was identified inside one of the rooms hoods on
<1 ft2 upper horizontal surface and inside the hot cell. All Activity was below the investigation limit. See map for specific location.
(0) Location > MDC 245 22-10-25-04 H220 No Alpha (0) Locations > Investigation Levels.
Highest Reading: <MDC
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 14 of 16 Survey ID Fixed Above Room Building Number Investigation Contamination Summary (Laboratory)
NIST- Criteria (0) Location >MDC Beta/
No (0) Location >Investigation Levels Gamma Highest Reading: <MDC Preliminary Class 1 Based on continued operations, Class will not change.
NOTES: All scans, static, and removable measurements were below the criteria. No elevated areas identified.
(0) Location > MDC No Alpha (0) Locations > Investigation Levels.
Highest Reading: <MDC 245 22-10-25-05 H221 (0) Location >MDC Beta/
No (0) Location >Investigation Levels Gamma Highest Reading: <MDC Preliminary Class 3 No Class change as a result of this survey.
NOTES: All scans, static, and removable measurements were below the criteria. No elevated areas identified.
(1) Location > MDC (# 37)
No Alpha (0) Locations > Investigation Levels.
Highest Reading: 39 dpm/100 cm2 245 22-10-25-06 H229 (0) Location >MDC Beta/
No (0) Location >Investigation Levels Gamma Highest Reading: <MDC Preliminary Class 1 No Class change as a result of this survey.
NOTES: No Removable Activity Identified. Elevated Fixed Alpha activity was identified inside one of the rooms hoods on
<1 ft2 upper horizontal surface. All Activity was below the investigation limit. See map for specific location.
(2) Location > MDC (# 40 & 41)
No Alpha (0) Locations > Investigation Levels.
245 22-10-25-07 H233 Highest Reading: 95 dpm/100 cm2 No (0) Location >MDC
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 15 of 16 Survey ID Fixed Above Room Building Number Investigation Contamination Summary (Laboratory)
NIST- Criteria Beta/ (0) Location >Investigation Levels Gamma Highest Reading: <MDC Preliminary Class 1 No Class change as a result of this survey.
NOTES: No Removable Activity Identified. Elevated Fixed Alpha activity was identified inside one of the rooms hoods on
<1 ft2 upper horizontal surface and inside of the sink. All Activity was below the investigation limit. See map for specific location.
(0) Location > MDC No Alpha (0) Locations > Investigation Levels.
Highest Reading: <MDC 245 22-10-26-01 H104 (1) Location >MDC (location #1)
Beta/ (1) Location >Investigation Levels (location Yes Gamma #1)
Highest Reading: 2143 dpm/100 cm2 Preliminary Class 1 No Class change as a result of this survey.
NOTES: No Removable Activity Identified. Elevated Fixed Beta/Gamma activity was identified inside one of the rooms hoods on a 100 cm2 surface. All Activity was below the investigation limit except for location #12 (2143 dpm/100 cm2 Beta/Gamma) found on inside the hood. See map for specific location.
(0) Location > MDC No Alpha (0) Locations > Investigation Levels.
Highest Reading: <MDC 245 22-10-26-02 H120 (0) Location >MDC Beta/
No (0) Location >Investigation Levels Gamma Highest Reading: <MDC Preliminary Class 1 Based on continued operations, Class will not change.
NOTES: All scans, static, and removable measurements were below the criteria. No elevated areas identified.
(0) Location > MDC No Alpha (0) Locations > Investigation Levels.
245 22-10-26-03 H113-4 Highest Reading: <MDC (5) Location >MDC (# 33,34,35,36 & 37)
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 16 of 16 Survey ID Fixed Above Room Building Number Investigation Contamination Summary (Laboratory)
NIST- Criteria (3) Location >Investigation Levels (# 34,35 &
See Beta/ 37)
Notes Gamma Highest Reading: See Notes Preliminary Class 3 No Class change as a result of this survey.
NOTES: No Removable Activity Identified. Elevated Readings due to Source Storage in room not real fixed activity. 22 uR/hr general area dose rates.
(3) Location > MDC (# 1,3 & 5)
Yes Alpha (1) Locations > Investigation Levels. (#1)
Highest Reading: 256 dpm/100 cm2 227 22-11-01-01 A334 (1) Location >MDC (# 1)
Beta/
No (0) Location >Investigation Levels Gamma Highest Reading: 225 dpm/100 cm2 Preliminary Class 1 No Class change as a result of this survey.
NOTES: No Removable Activity Identified. Elevated Fixed Alpha and Beta/Gamma Activity was identified inside one of the rooms hoods on a 100 cm2 surface. Elevated Alpha activity was identified on the floor at both entries to the lab. All Activity was below the investigation limit except for location #1 (256 dpm/100 cm2 Alpha) found on inside the hood. See map for specific location.
(1) Location > MDC (# 8)
No Alpha (0) Locations > Investigation Levels.
Highest Reading: 80 dpm/100 cm2 227 22-11-01-02 B343-1 (0) Location >MDC Beta/
No (0) Location >Investigation Levels Gamma Highest Reading: <MDC Preliminary Class 3 No Class change as a result of this survey.
NOTES: No Removable Activity Identified. Elevated Fixed Alpha activity was identified inside one of the rooms hoods on
<1 ft2 upper horizontal surface. All Activity was below the investigation limit. See map for specific location.
(1) Location > MDC (# 11) 227 22-11-01-03 B345 No Alpha (0) Locations > Investigation Levels.
Highest Reading: 52 dpm/100 cm2
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 17 of 16 Survey ID Fixed Above Room Building Number Investigation Contamination Summary (Laboratory)
NIST- Criteria (0) Location >MDC Beta/
No (0) Location >Investigation Levels Gamma Highest Reading: <MDC Preliminary Class 1 No Class change as a result of this survey.
NOTES: No Removable Activity Identified. Elevated Fixed Alpha activity was identified on a countertop. All Activity was below the investigation limit. See map for specific location.
(3) Location > MDC (# 16,17 & 18)
Yes Alpha (1) Locations > Investigation Levels (#18).
Highest Reading: 147 dpm/100 cm2 227 22-11-01-04 B353 (1) Location >MDC (#20)
Beta/
No (0) Location >Investigation Levels Gamma Highest Reading: 379 dpm/100 cm2 Preliminary Class 1 No Class change as a result of this survey.
NOTES: No Removable Activity Identified. Elevated Fixed Alpha activity was identified inside a hood, on a piece of equipment, and a countertop. Elevated Fixed Beta/gamma activity was identified on the floor. All Activity was below the investigation limit except for location #18 (147 dpm/100 cm2 Alpha) found on a piece of equipment. See map for specific location.
(0) Location > MDC No Alpha (0) Locations > Investigation Levels.
Highest Reading: <MDC 217 22-11-03-01 C115 (0) Location >MDC Beta/
No (0) Location >Investigation Levels Gamma Highest Reading: <MDC Preliminary Class 3 No Class change as a result of this survey.
NOTES: All scans, static, and removable measurements were below the criteria. No elevated areas identified.
(0) Location > MDC 217 22-11-03-02 D105 No Alpha (0) Locations > Investigation Levels.
Highest Reading: <MDC
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 18 of 16 Survey ID Fixed Above Room Building Number Investigation Contamination Summary (Laboratory)
NIST- Criteria (5) Location >MDC (#6,7,8,9 & 10)
Beta/
No (0) Location >Investigation Levels Gamma Highest Reading: 514 dpm/100 cm2 Preliminary Class 1 No Class change as a result of this survey.
NOTES: No Removable Activity Identified. Elevated Fixed Beta/Gamma activity encountered on all surfaces surveyed. All Activity was below the investigation limit. See map for specific location.
(0) Location > MDC No Alpha (0) Locations > Investigation Levels.
Highest Reading: <MDC 224 22-11-04-01 A306 (0) Location >MDC Beta/
No (0) Location >Investigation Levels Gamma Highest Reading: <MDC Preliminary Class 3 No Class change as a result of this survey NOTES: All scans, static, and removable measurements were below the criteria. No elevated areas identified.
(0) Location >
No Alpha (0) Locations > Investigation Levels.
Highest Reading: <MDC 226 22-11-04-02 B159 (1) Location > MDC (#10)
Beta/
No (0) Locations > Investigation Levels.
Gamma Highest Reading: 416 dpm/100 cm2 Preliminary Class 3 No Class change as a result of this survey NOTES: No Removable Activity Identified. Elevated Fixed Beta/Gamma activity encountered on a table. All Activity was below the investigation limit. See map for specific location.
(0) Location > MDC No Alpha (0) Locations > Investigation Levels.
221 22-11-08-01 B43 Highest Reading: <MDC No (1) Location > MDC (#4)
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 19 of 16 Survey ID Fixed Above Room Building Number Investigation Contamination Summary (Laboratory)
NIST- Criteria Beta/ (0) Locations > Investigation Levels.
Gamma Highest Reading: 206 dpm/100 cm2 Preliminary Class 3 No Class change as a result of this survey.
NOTE: Elevated Beta/Gamma activity identified inside hood cabinet. All Activity was below the investigation limit. See map for specific location.
(0) Location > MDC No Alpha (0) Locations > Investigation Levels.
Highest Reading: <MDC 245 22-11-09-01 G104 (2) Location >MDC (# 9 & 11)
Beta/
No (0) Location >Investigation Levels Gamma Highest Reading: 750 dpm/100 cm2 Preliminary Class 2 No Class change as a result of this survey.
NOTES: Elevated Beta/Gamma activity identified on concrete floor. All Activity was below the investigation limit. See map for specific location.
(0) Location > MDC No Alpha (0) Locations > Investigation Levels.
Highest Reading: <MDC 245 22-11-09-01 G105 (2) Location >MDC (# 2 & 4)
Beta/
Yes (1) Location >Investigation Levels (#2)
Gamma Highest Reading: 1270 dpm/100 cm2 Preliminary Class 1 No Class change as a result of this survey.
NOTES: Elevated Beta/Gamma activity identified on concrete floor. All Activity was below the investigation limit except for location #2 (1270 dpm/100 cm2) on the concrete floor. See map for specific location.
(1) Location > MDA (Spot # 5, 11 & 13)
No Alpha (0) Locations > Reporting Criteria.
245 22-11-10-01 B200 HIGHEST READING: <70 dpm/100 cm2 Yes (2) Location >MDA (All Spots)
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 20 of 16 Survey ID Fixed Above Room Building Number Investigation Contamination Summary (Laboratory)
NIST- Criteria (12) Location >Reporting Criteria (All Spots Beta/ but #7)
Gamma HIGHEST READING: 23637 dpm/ 100 cm2 Preliminary Class 1 No Class change as a result of this survey.
NOTES: Elevated Alpha and Beta/Gamma activity identified with floor scans across 30% of the room. Beta Activity identified above the investigation limit on concrete floor and duct tray. Historical contamination on ceiling also noted.
NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Page 21 of 16
- 8. REFERENCES
- 1. NRC Regulations 10 CFR 20 Subpart E.
- 2. NRC Regulatory Guide 1.86, Termination of Operating Licenses for Nuclear Reactors.
Acceptable Surface Contamination Levels.
- 3. NUREG-1575, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM).
- 4. NUREG-1505, A Nonparametric Statistical Methodology for the Design and Analysis of Final Decommissioning Surveys.
- 5. NUREG-1507, Minimum Detectable Concentrations with Typical Radiation Survey Instruments for Various Contaminants and Field Conditions.
- 6. NUREG-1757, Volume 1 Consolidated NMSS Decommissioning Guidance, Appendix B.
- 7. NUREG-1757, Volume 2 Consolidated NMSS Decommissioning Guidance.
- 8. 144337-RPT-001, NIST Historical Site Assessment (2023)
Scoping Report: NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Appendix Appendix A Scoping Survey Calibration Sheets
Scoping Report: NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Appendix Appendix B Scoping Surveys
Scoping Report: NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Appendix Appendix C Liquid Scintillation Results
Scoping Report: NIST-TR-23-002, NIST Scoping Study Report NIST Scoping Study Revision: A Appendix Appendix D Tennelec Results
NIST-TR-23-002 Scoping Study Report Ready for Signatures Final Audit Report 2023-04-25 Created: 2023-04-25 By: Ryan Larochelle (ryan@renuke.com)
Status: Signed Transaction ID: CBJCHBCAABAAF2E8c42njX2CDwmVKtvIp34sidm4b6qA "NIST-TR-23-002 Scoping Study Report Ready for Signatures" History Document created by Ryan Larochelle (ryan@renuke.com) 2023-04 6:21:31 PM GMT Document emailed to Jeff Knight (jknight@perma-fix.com) for signature 2023-04 6:23:11 PM GMT Email viewed by Jeff Knight (jknight@perma-fix.com) 2023-04 6:23:33 PM GMT Document e-signed by Jeff Knight (jknight@perma-fix.com)
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Signature Date: 2023-04 7:34:10 PM GMT - Time Source: server
Document emailed to Ryan Larochelle (ryan@renuke.com) for signature 2023-04 7:34:11 PM GMT Email viewed by Ryan Larochelle (ryan@renuke.com) 2023-04 7:34:59 PM GMT Document e-signed by Ryan Larochelle (ryan@renuke.com)
Signature Date: 2023-04 7:35:08 PM GMT - Time Source: server Agreement completed.
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