ML22069A341
| ML22069A341 | |
| Person / Time | |
|---|---|
| Site: | Zion File:ZionSolutions icon.png |
| Issue date: | 05/15/2019 |
| From: | ZionSolutions |
| To: | Office of Nuclear Material Safety and Safeguards |
| Shared Package | |
| ML22069A328 | List: |
| References | |
| ZS-2022-005 ZS-LT-200-001-001, Rev 6 | |
| Download: ML22069A341 (21) | |
Text
ZS-LT-200-001-001 Revision 6 Information Use Page 1 of 21 D&D Procedure CHARACTERIZATION/LICENSE TERMINATION PROCEDURE RADIOLOGICAL ASSESSMENTS AND REMEDIAL ACTION SUPPORT SURVEYS ZS-LT-200-001-001 Revision No. 6 Preparer: (Print name / sign):
Date:
05-07-2019 GL Wood Secondary Reviewer: (Print name / sign):
Date:
05-15-2019 Patsy Giza VP Regulatory Affairs or Designee has reviewed and determined required program & regulatory reviews (*new procedures only*) : SIGNATURE______________________________________________DATE:____________
Regulatory Required Reviews (per AD-11, Regulatory Reviews)
Part 72 ISFSI Impact License: 10 CFR 72.48 YES NO Part 50 License: 10 CFR 50.59 and 50.90 YES NO Fire Protection: 10 CFR 50.48(f)
YES NO Conditions of License: E-Plan: 10 CFR 50.54(q)
YES NO QA Review Required?
YES NO QA Reviewer:
N/A DATE:____________
Print Name / Signature Technical Review Required?
YES NO Technical Reviewer:
N/A DATE:____________
Print Name / Signature Technical Reviewer:
N/A DATE:____________
Print Name / Signature Approval Section DEPARTMENT MANAGER: D. Wojtkowiak/
DATE: 05-15-2019 Print Name / Signature DECOMMISSIONING PLANT MANAGER*:__________________________________________________DATE:______________
Print Name / Signature
- Required for Technical Reviews only Effective Date: May 28, 2019 N/A N/A
ZS-LT-200-001-001 Revision 6 Information Use Page 2 of 21 Summary of Changes in this Revision:
Rev. 5 - Procedure revised to implement recommended actions from ES-ZION-CR-2019-0046 Issue Review. Changes include; Addition to Prerequisites to include a description of the scope and purpose that is independent of a predecessor task and to include a graphical depiction.
ZS-LT-200-001-001 Revision 6 Information Use Page 3 of 21 1.
PURPOSE AND SCOPE.......................................................................................................4 1.1.
PURPOSE...................................................................................................................4 1.2.
SCOPE........................................................................................................................4 2.
RESPONSIBILITIES............................................................................................................4 3.
DEFINITIONS.......................................................................................................................5 4.
PRECAUTIONS, LIMITATIONS, AND PREREQUISITES...........................................7 4.1.
Precautions..................................................................................................................7 4.2.
Limitations..................................................................................................................7 4.3.
Prerequisites................................................................................................................8 5.
MAIN BODY..........................................................................................................................8 5.1.
General........................................................................................................................8 5.2.
Sample Plan Development..........................................................................................9 5.3.
Sample Plan Survey Instructions..............................................................................12 5.4.
Sample Plan Approval..............................................................................................13 5.5.
Sample Plan Implementation....................................................................................13 5.6.
Sample Plan Closure.................................................................................................14 6.
REFERENCES.....................................................................................................................14 7.
RECORDS............................................................................................................................14 8.
ATTACHMENTS................................................................................................................14 8.1., Sample & Measurement Unique Identification Designation............15 8.2., Calculation of Static and Scan MDC................................................16 8.3., RA/RASS Survey Design..................................................................18 8.4., RA/RASS Field Log..........................................................................20 9.
FORMS.................................................................................................................................15
ZS-LT-200-001-001 Revision 6 Information Use Page 4 of 21
- 1. PURPOSE AND SCOPE 1.1. PURPOSE The purpose of this procedure is to provide guidance on the development, implementation and review of Radiological Assessment (RA) and Remedial Action Support Survey (RASS) sample plans. RA and/or RASS sample plans are generated to assess the radiological conditions in impacted survey units where radiological conditions may have changed since characterization (RA) or in survey units undergoing remediation (RASS) at the Zion Station Restoration Project (ZSRP).
1.2. SCOPE This procedure implements the requirements of applicable U.S. Nuclear Regulatory Commission (NRC) regulations and guidance documents; specifically, NUREG-1757, Volume 2, Revision 1 Consolidated Decommissioning Guidance - Characterization, Survey, and Determination of Radiological Criteria (Reference 6.1), and NUREG-1575, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM, Reference 6.2).
This procedure applies to all personnel performing RA and RASS survey package development and/or implementation, data review and sample plan closeout.
- 2. RESPONSIBILITIES 2.1. Characterization/License Termination (C/LT) Manager - is responsible for:
Providing overall guidance and support for the development and implementation of RA and/or RASS sample plans.
Reviewing and approving all RA and/or RASS sample plans.
2.2. Radiological Engineer (RE) - is responsible for:
Preparing RA and/or RASS sample plans.
Reviewing and closing out RA and/RASS Sample Plans Ensuring RA and/or RASS surveys are conducted in accordance with approved survey and sampling plans, procedures, and work instructions.
Providing technical direction and guidance to field survey and sampling activities.
2.3. Characterization/License Termination (C/LT) Supervisor(s) - are responsible for:
Controlling and implementing sample plan instructions during field activities.
Providing daily supervision and guidance to field survey and sampling crews and performing quality checks of field activities.
Overseeing preparation of samples for transfer to on-site or off-site laboratories.
Ensuring all necessary instrumentation and other equipment is available to support survey activities.
ZS-LT-200-001-001 Revision 6 Information Use Page 5 of 21 2.4. Survey Mapping/CAD Specialist - is responsible for:
Preparing survey maps, layout diagrams, composite view drawings and other graphics as necessary to support survey design and reporting.
Interacting with the RE regarding the preparation of maps, diagrams and other graphics which present survey units and sample or measurement locations.
2.5. Database and LTP Support Engineer (D/LTP) - is responsible for:
Maintaining an index of pending, active and closed RA/RASS sample plans and packages and assigning storage locations.
Ensuring that RA/RASS sample plans and packages are properly labeled, stored and controlled per AD-20, Records Management Program (Reference 6.3) and ZS-LT-01, Quality Assurance Project Plan (for Characterization and FSS)
(QAPP) (Reference 6.4).
Serves as Department Records Custodian in accordance with AD-20.
2.6. Characterization/License Termination (C/LT) Technicians - are responsible for:
Obtaining and documenting survey measurements in accordance with the sample plan instructions.
Ensuring that all activities, actions, observations and obstructions that are encountered during the performance of the required surveys are documented in the RA/RASS Field Log (Attachment 4) for that survey unit.
- 3. DEFINITIONS 3.1. Action Level - The numerical value that will cause the decision maker to choose an alternative action. It may be a regulatory threshold standard, a dose or risk-based concentration level (e.g., Derived Concentration Guideline Level [DCGL]), or a reference-based standard.
3.2. Judgmental Measurements - Also referred to as biased measurement, judgmental measurements are performed at locations selected using professional judgment based on unusual appearance, location relative to known contamination areas, high potential for residual radioactivity, general supplemental information, etc.
3.3. Derived Concentration Guideline Level (DCGL) - A derived, radionuclide-specific activity concentration within a survey unit corresponding to the release criterion (referred to as Base Case DCGLs). DCGLs are derived from activity/dose relationships through various exposure pathway scenarios. To ensure that the summation of dose from each source term is 25 mrem/yr or less after all Final Status Survey (FSS) is completed, the Base Case DCGLs are reduced based on an expected, or a priori, fraction of the 25 mrem/yr dose limit from each source term. These reduced DCGLs are called Operational DCGLs. The Operational DCGL is then used as the DCGL for the FSS design of the survey unit (calculation of surrogate DCGLs, investigations levels, etc.).
ZS-LT-200-001-001 Revision 6 Information Use Page 6 of 21 3.4. Measurement - For the purpose of MARSSIM, it is used interchangeably to mean: 1) the act of using a detector to determine the level or quantity of radioactivity on a surface or in a sample of material removed from a media being evaluated, or 2) the quantity obtained by the act of measuring.
3.5. Minimum Detectable Concentration (MDC) - The Minimum Detectable Concentration (MDC) is defined as the a priori activity level that a specific instrument and technique can be expected to detect 95% of the time. When stating the detection capability of an instrument, this value should be used. The MDC is the detection limit, (LD), multiplied by an appropriate conversion factor to give units of activity. The critical level, (LC), is the lower bound on the 95% detection interval defined for LD and is the level at which there is a 5% chance of calling a background value greater than background. This is the value used when actually counting samples or making direct radiation measurements.
Any response above this level should be considered as above background (i.e., a net positive result). This will ensure 95% detection capability for LD. The MDC is dependent upon the counting time, geometry, sample size, detector efficiency and background count rate.
3.6. Sample Plan - Sampling plans are prepared for each survey unit independently and contain, at a minimum, survey instructions, the number and location of survey measurements and samples, survey maps, instrumentation requirements, and safety requirements as necessary.
3.7. Survey Unit - The study area consisting of structures or land areas of specified size and shape for which a separate decision will be made to judge whether the remedial action has achieved the site-specific reference-based cleanup standard for the designated pollution parameter. Survey units are generally formed by grouping contiguous site areas with a similar use history and the same classification of contamination potential.
3.8. Acronyms
ALARA -
As Low As Reasonably Achievable CoC -
Chain-of-Custody DCGL -
Derived Concentration Guideline Level DQO -
Data Quality Objectives FSS -
Final Status Survey GPS -
Global Positioning System HSA -
Historical Site Assessment HTD -
Hard-to-Detect MARSSIM - Multi-Agency Radiation Survey and Site Investigation Manual MDC -
Minimum Detectable Concentration NRC -
U.S. Nuclear Regulatory Commission QA -
Quality Assurance
ZS-LT-200-001-001 Revision 6 Information Use Page 7 of 21 QAPP -
Quality Assurance Project Plan RA -
Radiological Assessment RASS -
Remedial Action Support Survey RE -
Radiological Engineer ZSRP -
Zion Station Restoration Project
- 4. PRECAUTIONS, LIMITATIONS, AND PREREQUISITES 4.1. Precautions 4.1.1 Documents and databases containing characterization survey data and survey records are Quality Assurance (QA) records when complete. Positive control of these records shall be maintained until such time that they are forwarded to Records Management.
4.1.2 When documenting survey information, all personnel shall ensure that all QA records are of good quality and legible. Legibility is determined to be readable and reproducible.
4.1.3 Radiological Assessments and Remedial Action Support Surveys may include, when practicable, a description of the scope and purpose of the survey that is independent of proper execution of a predecessor task and, to include a graphical depiction of scope as necessary.
4.1.4 The RE tasked with the development and implementation of multiple RA and/or RASS sample plans must be aware that it is possible that duplicate sample/measurement numbers may be generated when using the guidance for designating a unique sample identification number in accordance with the Sample
& Measurement Unique Identification Designation presented in Attachment 1.
Consequently, the responsible RE must be vigilant to ensure that this does not occur. The guidance provided in Attachment 1 may be supplemented by the RE with alternative designations as specified in the RA/RASS Sample Plan.
4.1.5 Ten percent (10%) of any soil samples collected during an RA in a survey area, with a minimum of one sample, will be analyzed for the full initial suite of radionuclides (including Hard-to-Detect [HTD] radionuclides). Additionally, if levels of residual radioactivity from gamma Radionuclides-of-Concern (ROC) in an individual soil sample exceed the Sum-of-Fractions (SOF) of 0.1, then the sample will be analyzed for the full initial suite of radionuclides (includes HTD radionuclides).
4.2. Limitations 4.2.1 All attachments described in this procedure may be generated electronically. If electronic attachments are used, the physical layout of the attachment may be modified provided the intent described in this procedure is not changed.
ZS-LT-200-001-001 Revision 6 Information Use Page 8 of 21 4.2.2 The output of the design process is the sample plan (instructions). A sample plan is prepared for each survey unit independently. A survey package is prepared for each survey unit and may contain one or more sample plans.
4.2.3 Radiation detection and measurement instrumentation will be selected based on the type and quantity of radiation to be measured. For direct measurements and sample analyses, MDCs less than 10% of the Operational DCGL are preferable while MDCs up to 50% of the Operational DCGL are acceptable.
4.2.4 Instruments used for scan measurements in Class 1 areas are required to be capable of detecting radioactive material at the Base Case DCGL.
4.2.5 The MDC for measurements obtained using laboratory instruments will be 10 percent of the applicable Operational DCGL.
4.2.6 Measurement results taken with instrumentation that exceeds the maximum MDC values may be accepted as valid data after evaluation by a RE.
4.2.7 All RA or RASS direct measurements and/or samples will be given a unique sample identification number in accordance with the Sample & Measurement Unique Identification Designation presented in Attachment 1.
4.2.8 During sample plan development, the letter A will always be used as a default for digit 8 in the nomenclature on Attachment 1 if there are no sub-units in the survey unit.
4.3. Prerequisites 4.3.1 All survey or counting instruments used to produce RA and/or RASS survey data shall be in current calibration and verified to be operational.
- 5. MAIN BODY 5.1. General 5.1.1 Remedial Action Support Surveys (RASS) are conducted to; 1.)
Support remediation of a structure that will be subjected to FSS.
2.)
Support guided remediation in an excavation of contaminated soils.
3.)
Support pre-demolition surveys of structures that could impact a previously characterized structure or open land survey unit.
ZS-LT-200-001-001 Revision 6 Information Use Page 9 of 21 NOTE At a minimum, a RA performed to support an excavation shall consist of scans of the footprint of the excavation and scans of the area where the soil will be staged, with a minimum scan coverage commensurate with the survey unit classification where the excavation occurs (in accordance with LTP Chapter 5, Table 5-24). In addition, periodic scans will be performed on the soil as it is excavated and a final scan will be performed when the excavation is complete. Soil samples may be obtained throughout the process using engineering judgment; however, a minimum of one sample must be obtained upon completion of the excavation and pipe removal activities and prior to backfill.
5.1.2 Radiological Assessments (RA) are performed:
1.)
Where an excavation is created to expose buried components (e.g. concrete pads, buried pipe, buried conduit, etc) or to install a new buried system, 2.)
Determine when a survey unit is ready for Final Status Survey (FSS),
3.)
Update characterization data as necessary to use for FSS survey design.
5.1.3 The documented results of RA and RASS surveys shall be placed in the survey folder for the open land or structural survey units that is pertinent to the area and/or items surveyed and documentation shall be controlled in accordance with the record quality requirements of the ZionSolutions QAPP.
5.2. Sample Plan Development 5.2.1 Initiate Attachment 3, RA/RASS Survey Design for the applicable survey unit.
5.2.2 Complete the Description section, providing the following:
1.)
The type of survey (RA or RASS),
NOTE Sample plans will be numbered in numerical sequence for each type (RA or RASS) of survey in each individual survey unit. For example, if three (3)
RASS surveys have been previously worked in a survey unit, then the next sample plan generated for that survey unit would be numbered #04.
2.)
The next sequential sample plan number for the survey unit, 3.)
Survey Area Number and Description, 4.)
Survey Unit Number and Description.
ZS-LT-200-001-001 Revision 6 Information Use Page 10 of 21 5.2.3 Designate the type of survey unit.
NOTE The Zion Station Historical Site Assessment (HSA) (Reference 6.5) established the initial survey unit classification for each survey unit. Radiological survey data from characterization surveys, operational surveys in support of D&D, routine surveillance, and any other applicable survey data may provide indications that would cause an increase in survey area classifications (for example, from Class 3 to Class 2 and from Class 2 to Class 1) until the time of commencement of the FSS. Final classification is performed and verified as a DQO during FSS design.
5.2.4 Designate the current classification of the survey unit.
5.2.5 Denote the reason for performing the survey.
5.2.6 State the Action Levels applicable to the survey.
NOTE The action levels for gross activity (static or scan) should be set at an observed reading of elevated activity above background where an action, such as reclassification, performing an additional investigation or performing additional remediation would be required. This action level may be based on the sensitivity of the instrument used, an ALARA criterion for the remediation of structural surfaces or an adjusted gross DCGL for soils.
1.)
If static measurements will be taken during the survey, then state the action level for static measurements and the appropriate units.
2.)
If scan measurements will be taken during the survey, then state the action level for scan measurements and the appropriate units.
NOTE The action level for isotopic activity (gamma-emitters or beta/alpha-emitters) is typically the Operational DCGL for the ROC.
3.)
If sample(s) of a media will be taken, then denote the type of analysis that will be performed.
A.
If gamma spectroscopy analysis will be performed, then denote the desired isotopic MDC for Cs-137 and Co-60.
B.
Any samples sent for analysis for HTD radionuclides will be analyzed for the full initial suite of radionuclides as specified in LTP Chapter 5, Table 5-1.
ZS-LT-200-001-001 Revision 6 Information Use Page 11 of 21 NOTE The type(s) of measurements and/or samples and the necessary sample/measurement population size will be determined by the professional judgment of the responsible RE.
The number of measurement/sample(s) are a minimum population that will be taken. Additional measurement/sample(s) may be taken as necessary based upon the observed conditions or activities as the survey is being performed.
5.2.7 Denote the minimum number of samples and/or measurements that are required to adequately address the objectives of the survey.
NOTE Static and Scan MDC for scanning structures and Scan MDC for soil will be determined in accordance with the guidance provided in Attachment 2.
5.2.8 Designate the radiological instrumentation and detectors that will be used to acquire field measurements and document the static and scan MDC.
1.)
Denote the assumption(s) for the variable(s) used to calculate the static and scan MDC(s) in the Notes section.
NOTE The location of measurements and/or samples that will be taken will be determined by the professional judgment of the responsible RE.
Measurement/sample locations may be pre-determined or based on real-time observations as decommissioning activities occur (e.g. excavation, remediation, system removal, demolition, backfill and grading).
Consideration should be given to locations that exhibit the greatest potential for elevated radioactivity, including depressions, discolored areas, cracks, low point gravity drain points and actual or potential spill locations.
5.2.9 Describe the location(s) of where measurement(s) and/or sample(s) will be taken.
NOTE Pre-determined measurement/sample location(s) may be selected at random, using a systematic approach or judgmental.
Chosen location(s) may be physically marked using flags and/or marking paint or denoted by using Global Positioning System (GPS) coordinates.
1.)
If measurement/sample locations are pre-determined, then denote how the locations will be selected and marked.
ZS-LT-200-001-001 Revision 6 Information Use Page 12 of 21 2.)
If measurement/sample locations will be selected based on real-time observations, then describe the criteria that should be employed to determine when and where a measurement/sample should be taken.
5.3. Sample Plan Survey Instructions NOTE Survey instructions may be provided without using RA/RASS Survey Design (Attachment 3) provided all the applicable items of the Survey Instruction attachment are included.
5.3.1 Complete the Survey Instructions section of RA/RASS Survey Design (Attachment 3). The types of instructions that may be specified include, but are not limited to the following:
1.)
Description of potential safety hazards that may be encountered during performance of the survey including any required Personal Protective Equipment, safety sampling and/or safety surveillances.
2.)
A list of all equipment and instrumentation required to perform the survey, as well as applicable procedural references.
3.)
Identified areas, conditions or constraints where sampling or surveying may not be possible and alternative solutions to support survey requirements if these obstacles are encountered.
4.)
Specific instructions for performing sampling, scans, total surface contamination measurements, loose surface contamination measurements or special measurements including:
A.
Area (in square meters) and location for surface scans.
B.
Specific scanning instructions including scan speed, pattern (e.g., serpentine),
alarm set-points, action levels, background check, etc.
C.
Instructions for background correction if applicable.
D.
Count times for static measurements.
E.
Desired depth and volume requirements for surface and subsurface soil samples.
F.
Directions for taking water, sediment or vegetation samples as necessary.
5.)
Instructions for quality control (e.g., techniques to prevent cross-contamination, proper sampling, and labeling techniques).
6.)
Action(s) to be performed if an action level(s) is exceeded.
7.)
Documentation requirements (e.g., survey map, documentation of anomalies).
8.)
Chain-of-Custody (CoC) instructions for media samples.
ZS-LT-200-001-001 Revision 6 Information Use Page 13 of 21 9.)
Any areas of interface where the progress of the survey will be contingent on interaction or support from another department or group (e.g., security notification, man-lift support, scaffold erection support, excavation or soil loading support, etc.).
5.4. Sample Plan Approval 5.4.1 When the sample plan is complete, the Attachment 3 will be reviewed and signed by the RE and then forwarded to the C/LT Manager for approval.
5.4.2 The C/LT Manager will signify approval of the sample plan by signing Attachment 5.5. Sample Plan Implementation 5.5.1 C/LT Supervisor shall perform a pre-survey briefing with the C/LT Technicians assigned to execute the sample plan during which the survey instructions and safety issues will be reviewed.
5.5.2 C/LT Technicians shall perform surveys in accordance with the survey instructions contained in the sample plan.
1.)
If a situation is encountered in which survey instructions cannot be followed as written, then contact the responsible RE for resolution.
5.5.3 C/LT Technicians shall create a RA/RASS Field Log (Attachment 4) for the survey.
The type(s) of information that may be documented in the RA/RASS Field Log (Attachment 4) include, but are not limited to the following:
1.)
A description of the physical conditions encountered.
2.)
Observed background as well as obvious sources contributing to background from adjacent areas.
3.)
Instrument(s) and detector(s) used, serial numbers and calibration date(s).
4.)
Changes in measurement/sample location(s) due to encountered obstacle(s) and/or physical constraint(s).
5.)
A description of location(s) or item(s) surveyed where the applicable action level(s) were exceeded, the results of any investigation(s) and any action(s) taken as a result.
5.5.4 C/LT Technicians shall denote on a survey map the location of all measurement/sample location(s) and area(s) scanned.
5.5.5 When the survey and all investigations are complete, C/LT Technicians shall forward all completed RA/RASS Field Logs (Attachment 4), survey maps, instrument download report(s) and sample analysis report(s) to the C/LT Supervisor.
5.5.6 The C/LT Supervisor shall review the completed documents for completeness and accuracy. When the review is satisfactory, the completed survey will be forwarded to the responsible RE for sample plan closure.
ZS-LT-200-001-001 Revision 6 Information Use Page 14 of 21 5.6. Sample Plan Closure 5.6.1 The RE shall perform an evaluation of the sample plan to determine if survey results are acceptable and complete. The review should include, but is not limited to the following:
1.)
Ensure that survey measurements are recorded in units appropriate for comparison to the applicable Action Levels.
2.)
Review all laboratory analysis reports for media samples.
3.)
Review the counting parameters of survey measurements and analytical results of sample media to ensure that the count times used resulted in an acceptable MDC.
4.)
Compare survey results to the applicable action level. If any survey result exceeds the action level, then ensure that appropriate actions or investigations are implemented.
5.6.2 When the survey has been reviewed and accepted, then the RE shall sign RA/RASS Survey Design (Attachment 3) and forward the package to the C/LT Manager or designee for approval.
5.6.3 The C/LT Manager will signify closure of the sample plan by signing Attachment 3.
- 6. REFERENCES 6.1.
NUREG-1757, Consolidated NMSS Decommissioning Guidance - Characterization, Survey, and Determination of Radiological Criteria Volume 2, Revision 1 6.2.
NUREG-1575, Multi-Agency Radiation Survey and Site Investigation Manual (MARSSIM) 6.3.
AD-20, Records Management Program 6.4.
ZS-LT-01, Quality Assurance Project Plan (for Characterization and FSS) (QAPP) 6.5.
Commonwealth Edison Zion Station Historical Site Assessment 6.6.
ISO 7503-1, Evaluation of surface contamination - Part 1: Beta-emitters (maximum beta energy greater than 0.15 MeV) and alpha-emitters 6.7.
ZionSolutions TSD-2011-004, Ludlum Model 44-10 Detector Sensitivity
- 7. RECORDS 7.1., RA/RASS Survey Design 7.2., RA/RASS Field Log
- 8. ATTACHMENTS 8.1., Sample & Measurement Unique Identification Designation 8.2., Calculation of Static and Scan MDC
ZS-LT-200-001-001 Revision 6 Information Use Page 15 of 21 8.3., RA/RASS Survey Design 8.4., RA/RASS Field Log
- 9. FORMS None
Sample & Measurement Unique Identification Designation ZS-LT-200-001-001 Revision 6 Information Use Page 16 of 21 (1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
(9)
(10)
(11)
(12)
(13)
(14)
(15)
(16)
(17)
Classification & Survey Area 1st digit indicates type of Survey Area L = Open Land Area B = Structural Survey Area S = System 2nd digit indicates Classification 1 = Class 1 2 = Class 2 3 = Class 3 4 = Non-impacted 5 = Unassigned 3rd, 4th and 5th digits indicates Survey Area Number (from Tables 6-1 and 6-2)
Survey Unit Number &
Sequence Indicator 6th and 7th digits indicates Survey Unit Number (from Tables 6-1 and 6-2)
The 8th digit indicate alphanumeric sequence (Sequence A-J) allows the survey unit to be divided into 10 smaller survey units.
(Sequence K-Z) allows for up to 16 different survey instructions for a single survey unit.
Survey and Measurement Type The 9th digit indicate the type of survey.
A = Assessment B = Background S = Scoping C = Characterization R = Remedial Action F = FSS I = Investigation V = Verification Q = QA/QC E = Excavation The 10th digit indicates the type of measurement.
B = Background R = Random S = Systematic J = Judgmental I = Investigation V = Verification Q = QA/QC Surface Type The 11th digit indicates the type of surface where the measurement was taken.
F = Floor W = Wall C = Ceiling S = System R = Roof P = Paved Road G = Ground L = Water The 12th digit indicates the material composition of the surface where the measurement was taken.
C = Concrete M = Metal W = Wood B = Cinder Block K = Brick A = Asphalt S = Soil T = Tar L = Liquid Sample or Measurement No.
The 13th, 14th and 15th digits indicate the alphanumeric measurement number Sequentially, 001 through 999 Media Type The 16th and 17th digits indicate the type of media that was sampled.
SS = Surface Soil SB = Subsurface Soil SM = Sediment WT = Water LQ = Other liquids besides water OL = Oil CV = Volumetric Concrete AV = Volumetric Asphalt MT = Metal PT = Paint SW = Smear Sample BD = Beta Direct AD = Alpha Direct GD = Static Gamma measurement BS = Beta Scan GS = Gamma Scan JS = Juncture Scan JD = Juncture Direct PS = Penetration Scan PD = Penetration Direct
Calculation of Static and Scan MDC Page 1 of 2 ZS-LT-200-001-001 Revision 6 Information Use Page 17 of 21 MDC is the minimum activity concentration on a surface or within a material volume, that an instrument is expected to detect (e.g., activity expected to be detected with 95% confidence).
The MDC is dependent upon the counting time, geometry, sample size, detector efficiency and background count rate. For a portable instrument, MDC is calculated using two different methods depending on the mode of operation, static (MDCstatic) or scanning (MDCscan).
Total Efficiency Instrument efficiencies (i) are derived from the surface emission rate of the radioactive source(s) used during the instrument calibration. Total Efficiency (t) is calculated by multiplying the instrument efficiency (i) by the surface efficiency (s) commensurate with the radionuclides alpha or beta energy using the guidance provided in ISO 7503-1, Evaluation of surface contamination - Part 1: Beta-emitters (maximum beta energy greater than 0.15 MeV) and alpha-emitters (Reference 6.6).
Beta Scan Measurement MDC The formula used to determine the scanning MDC at the 95% confidence level is:
=
(60
)
()(
100)
- Where, MDCscan = Minimum Detectable Concentration in dpm/100 cm2 d
= index of sensitivity (1.38) i
= observation interval (seconds) bi
=
background counts per observation interval t
=
total efficiency p
= surveyor efficiency (0.5)
A
= detector area in cm2 (not to exceed 126 cm2)
The observation interval (i) is considered to be the amount of time required for the detector field of view to pass over the area of concern. This time depends upon the scan speed, the size of the source, and the fraction of the detectors sensitive area that passes over the source. The scan speed is based on one detector window width per second however; other scan speeds may be used. For the Ludlum Model 43-68 gas flow proportional detector, the window width is 8.8 cm resulting in a scan speed of ~3.5 inches per second. The floor monitor detector is the Ludlum Model 43-37 with a window width of 13.35 cm which results in a scan speed of 5.25 inches per second.
Calculation of Static and Scan MDC Page 2 of 2 ZS-LT-200-001-001 Revision 6 Information Use Page 18 of 21 Direct Beta Measurement MDC Direct (static) measurements utilize the following formula:
=
2.71
+3.29
+
100 2
- Where, MDCstatic = Minimum Detectable Concentration in dpm/100 cm2 ts
= sample count time tb
= background count time Rb
= background count rate (cpm) t
= total efficiency A
= detector window area (cm2)
Gamma Scan MDC The gamma scan MDC is discussed in detail in TSD-2011-004, Ludlum Model 44-10 Detector Sensitivity (Reference 6.7). This Technical Support Document (TSD) examines the gamma sensitivity for 5.08 by 5.08 cm NaI detectors to several radionuclide mixtures of Co-60 and Cs-137 using sand (SiO2) as the soil base. The TSD derives the MDC for the radionuclide mixtures at various detector distances and scan speeds. The TSD model uses essentially the same geometry configuration as the model used in MARSSIM (Reference 6.2). TSD-2011-004 provides MDC values for the expected ZSRP soil mixture based on detector background condition, scan speed, soil depth (15 cm), soil density (1.6 g/cm3) and detector distance to the suspect surface.
RA/RASS Survey Design Page ___ of ___
ZS-LT-200-001-001 Revision 6 Information Use Page 19 of 21
==
Description:==
Survey Type
- RA
- RASS Sample Plan No.:
Survey Area No.:
Description:
Survey Unit No.:
Description:
Survey Unit Type:
- Open Land
- Structure Interior
- Structure Exterior
- System Survey Unit Classification:
Current Classification:
- Non-Impacted
- Class 3
- Class 2
- Class 1 Reason for Survey:
RA:
- Excavation Support
- FSS Readiness
- Characterization Update RASS:
- Remediation Support
- Excavation Support
- Demolition Support Radiological Action Level(s):
- Gross Activity
- Isotopic Activity
- Static Measurement
- Gamma Spectroscopy (units)
- Scan Measurement
- Hard-to-Detect Radionuclide(s)
(units)
Alarm set-points for gross activity will be set at the appropriate action level plus the observed background for the area.
Count times will be adjusted to achieve an isotopic MDC equal to or less than 10% of Operational DCGL Radionuclides of Interest: _________________________
Types and Number of Measurements/Sample(s):
Minimum #
Type Minimum #
Type Surface Soil Sample(s)
Swipe Sample(s)
Subsurface Soil Sample(s)
Static beta-gamma measurement(s)
Sediment Sample(s)
Static alpha measurement(s)
Concrete Core Sample(s)
N/A Surface Scans (structures)
Volumetric Concrete Sample(s)
N/A Surface Scans (soils)
Volumetric Asphalt Sample(s)
Other _________________________
Water Sample(s)
Other _________________________
Instrument(s) and Detector(s):
Instrument Type:
Detector Type:
Static MDC:
Scan MDC:
1 2
3 4
Note(s):
RA/RASS Survey Design Page ___ of ___
ZS-LT-200-001-001 Revision 6 Information Use Page 20 of 21 Description of Measurement/Sample Location(s):
Survey Instruction(s):
Survey Plan Approval:
Prepared by:
Date:
Radiological Engineer Reviewed and Approved by:
Date:
Characterization/License Termination Manager Survey Plan Closure:
Reviewed by:
Date:
Radiological Engineer Approved by:
Date:
Characterization/License Termination Manager
RA/RASS Field Log Page ___ of ___
ZS-LT-200-001-001 Revision 6 Information Use Page 21 of 21
==
Description:==
Survey Type
- RA
- RASS Sample Plan No.:
Date:
Survey Area No.:
Description:
Survey Unit No.:
Description:
Field Log: