ML063340255
| ML063340255 | |
| Person / Time | |
|---|---|
| Site: | Yankee Rowe |
| Issue date: | 08/09/2005 |
| From: | Bisson J, Danni Smith Yankee Atomic Electric Co |
| To: | NRC/FSME |
| References | |
| NOL-02, YNPS-FSSP-NOL02-01-00 | |
| Download: ML063340255 (45) | |
Text
Final Status Survey Planning Worksheet Page -1 of 9-11 GENERAL SECTION 11 11 Survev Area #: NOL-02 I Survev Unit #: 01 11 Survey Unit Name: Spent Fuel Pit Excavation East FSSP Number: YNPS-FSSP-NOL02-0 1-00 PREPARATION FOR FSS ACTIVITIES 11 Check marks in the boxes below signify afirmative responses and completion of the action.
II I 1.1 Files have been established for survey unit FSS records.
4 1 1.2 ALARA review has been completed for the survey unit.
See YA-REPT-00-003-05 1 1.3 The survey unit has been turned over for final status survey.
I1 1.4 An initial DP-8854 walkdown has been performed and a copy of the completed Survey Unit Walkdown Evaluation is in the survey area file.
IXI 1 1.5 Activities conducted within area since turnover for FSS have been reviewed. H I1 11 Based on reviewed information, subsequent walkdown:
H not warranted warranted 11 IINote: Based upon Rad Engineer walkdown at the Final Turnover 11
/
If warranted, subsequent walkdown has been performed and documented per DP-8854.
The basis has been provided to and accepted by the FSS Project Manager for not performing a subsequent walkdown.
11 1.6 A final classification has been performed.
II 11 Classification: CLASS 1 IXI CLASS 2 CLASS 3 1.0 State the problem:
Survey Area NOL-02-01 is the previous site of the New Fuel Vault and surrounding areas east of the former Spent Fuel Pool. The soils located around and under NOL-02-01 include backfill, overburden, and glacio-lacustrine till. Permeability to groundwater flow is varied with the till being the most impermeable and the backfill being the least impermeable. Geoprobe soil samples taken from around the SFP, NFV and IX Pit have shown amounts in excess of the DCGL values for Co-60, Cs-13 7 and Ag-108m and the subject soil was removed during excavation. Demolition activities have since been completed in NOL-02-0 1.
11 Post excavation remediation and a Characterization Survey have been performed in NOL 11 0 1. Characterization sampling indicates levels of (20-60 less than 0.6 pCi/gm and Cs-137 levels less than 1.5 pCi/gm. Initial scans were performed using SPA-3 and ISOCS with remediation carried out at locations that indicated elevated levels of radioactivity.
Based upon the radiological condition of this survey area identified in the operating history, and as a result of the decommissioning activities performed to date, survey area NOL-02-01 is identified as a Class 1 Area.
The problem, therefore, is to determine whether the accumulation of licensed radioactive materials generated during plant operation, existing in Survey Unit NOL-02-01, meets the release criterion.
The planning team for this effort consists of the FSS Project Manager, FSS Radiological Engineer, Radiation Protection Manager, FSS Field Supervisor, and FSS Technicians. The FSS Radiological Engineer will make primary decisions with the concurrence of the FSS Project Manager.
2.0 Identify the decision:
The decision to be made can be stated "Does residual plant-related radioactivity, if present in the survey unit, exceed the release criteria?"
Alternative actions that may be employed are investigation, remediation and re-survey.
I 3.0 Identify the inputs to the decision:
Inputs to the decision include information that will be required to resolve the decision. The information will address such topics as:
Survey techniques and analytical methodologies selected to generate the required analytical data Types and number of samples required to demonstrate compliance with the release criterion Identification of the radionuclides-of-concern and their corresponding DCGLs The various aspects of the data such as quality and data sensitivity ensure accurate information is utilized in the testing of the hypothesis.
11 sample media: soil
Table 1 8.73 mremlyr DCGL
'SPA-3scan MDCR and MDC(fDCGLEm): See Attachment 1 SPA3 DCGLEMc: 6.9 pCi/gm Surrogate DCGLs (ISOCS): Co-60 (1.2 pCi/gm) Cs-137 (2.8 pCi/gm) Agl08m (2.1 pCi/gm)
DCGLEMc (surrogated): Co-60 13 pCi/gm Cs-137 (6 1 pCi/gm) Ag-108m (1 9 pCi/gm)
Note: Surrogates were developed based upon the nuclide mix in sample SFP-GP-12-01 Radionuclides for analysis: All LTP nuclides with the focus on co60, C S
~
~
~
and A~~~~~
1 ISOCS Nuclide Library: Library will include the gamma emitters listed in Table 2 investigation Leveifor soii sampies: Investigation Levei for soii sampies wiii be >DCGLEMC or >DCGLw and a statistical outlier 1 Adjusted investigation Level (DCGLEMc) for ISOCS Measurements:
Ag-108m (1.3 pCi/gm)
Note: The DCGLEMc for the SPA-3 was developed using area factors for a 43.7m2 area (the area in the systematic grid). The adjusted investigation levels for the ISOCS were derived by multiplying the DCGLEMc (DCGLw
- AF for a lm2 elevated area) by the ratio of MDAs obtained from the 12.6 m2 field of view relative to the MDA obtained for a lm2 area at the edge of the 12.6 m2 field of view as this leads to a conservative model. Cs-134 was not surrogated due to its absence in the characterization samples. The values developed for the lm2 elevated area at the edge of the field of view used for the ISOCS scan investigative levels are sensitive enough to detect the elevated comparison values for the 43.7m2 area.
Investigation Level for SPA-3LE-600: Audible increases above background that are reproducible MDCs for gamma analysis of soil samples:
Table 2 MDCs for gamma emitters The desired MDCs in the laboratory analysis of FSS soil samples should be the 10% values. If it is impractical to achieve those, the 50% DCGLw values must be achieved in the laboratory analysis of the FSS soil samples. ISOCS measurements will meet the 10-50% DCGLEMc values for the gamma emitting nuclides listed in Table 2.
Nuclide Co-60 Nb-94 Ag-1 O8m Sb-125 CS-134 CS-137 Eu-152 Eu-154 Eu-1 55 MDCs for HTD nuclides: In addition to the MDC values listed above, the following MDC values will also be transmitted to the outside laboratory via the chain-of-custody form accompanying the FSS soil samples:
1040% DCGLw (pCi/gm 0.14-0.70 0.25-1.2 0.25-1.2 1.10-5.5 0.17-0.86 0.30-1.5 0.35-1.8 0.33-1.7 14-70 DPF
Table 3 MDCs for Hard-to-Detect nuclides Survey coverage: Scan measurements, or ISOCS (the primary method of scans), will provide a 100% coverage of the survey area QC checks and measurements: QC checks for the Portable ISOCS will be in accordance with DP-8869 and DP-8871. Two samples will be chosen as QC split samples and will be analyzed by an off-site laboratory for all LTP nuclides. Additionally, two samples will be analyzed twice in-house by gamma spectroscopy and the results compared.
4.0 Define the boundaries of the survey:
Survey Unit NOL-02-01 is located within the RCA and is bounded by NOL-0 lon the north, NOL-02 on the east and south, and NOL-0 1-02 and NOL-0 1-03 on the west.
Surveying of NOL-02-01 will be performed during daylight hours when weather conditions will not adversely affect the data acquisition.
5.0 Develop a decision rule:
Null hypothesis: The null hypothesis (H,), as required by MARSSIM, is stated and tested in the negative form: "Residual licensed radioactive materials in Survey Unit 01 exceeds the release criterion. The null hypothesis, as stated in this manner, is designed to protect the health DPF-8856.1 5
YNPS-FSSP-NOL02-0 1-00
of the public as well as to demonstrate compliance with the requirements set forth in the Yankee Rowe License Termination Plan. In general, hypothesis testing will result in the following assessments:
- a. If all of the sample data show that the soil concentrations of all plant-related LTP nuclides are below the DCGLs and the sum of fractions for these nuclides are less than unity, reject the null hypothesis (i.e. NOL-02-01 meets the release criteria).
- b. If the action levels are exceeded, then perform an investigation survey.
- c. If the average concentration is below the DCGL, but individual measurements exceed the DCGL then apply a statistical test to either accept or reject the null hypothesis.
- d. If the average concentration of any individual nuclide exceeds the DCGL or if the sum of fractions exceeds unity, then accept the null hypothesis (i.e. NOL-02-01 does not meet the release criteria).
6.0 Specify tolerable limits on decision errors:
Probability of type I (a) error: 0.05 Probability of type 11 (B) error: 0.05 LBGR: 0.5 7.0 Optimize Design:
Type of statistical test: WRS Test Sign Test Basis including background reference location (if WRS test is specified): N/A Number of samples: 15 Random Selected Split Samples: Two samples will be split samples Hard-to-Detect analyses: Two samples sent for off-site analysis will be analyzed for all LTP hard-to-detect radionuclides referenced in this survey plan Sample Recounts: Two samples will be recounted on-site GENERAL INSTRUCTIONS 1
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C ; U ~ ~ U ~ ~ G ~ ~ G G ~ I ~ G ~ I L UI sull sillllpll~lg any other scheduled activities subject to QA notification that are currently known.
- 2. Soil samples will be collected in accordance with DP-8120 in one-liter marinelli beakers.
Extraneous materials (e.g. vegetation, debris, rocks, etc.) will be removed prior to placing DPF-8856.1 6
YNPS-FSSP-NOL02-01-00
unbiased soil samples at 15 systematic locations with a random start point.
11
- a. FSS soil samples: NOL-02-0 1-00 1 -F through NOL-02-0 1-0 15-F.
- b. Samples NOL-02-0 1 -005-F-S, NOL-02-0 1 -008-F-S will be designated as split samples sent for full analysis by the off-site laboratory for all LTP nuclides.
- c. The off-site gamma spec. results will be compared with the on-site results in accordance with DP-8864.
Two recount samples: NOL-02-01-004-F and NOL-02-01-0 1 1 -F will be counted twice on site and th re,sults compared in accordance with DP-8864.
received and prepared in accordance with DP-88 13.
form will be used in accordance with DP-8123 for all the split samples.
will be identified using GPS. In cases where the location cannot be determined directly using GPS, an offset will be used to describe the distance and bearing from a known GPS location, Each location will be marked by a flag, either prior to or at the time of the sampling. The FSS Radiological Engineer or FSS Field Supervisor will guide the FSS to the sample locations.
QA has been notified of the date and time of the commencement of the first of the Portable ISOCS will be in accordance with DP-8871, with QC checks performed in accordance with DP-8869 and DP-8871. Operation of the E-600 w/SPA-3 will be in accordance with DP-8535, with QC checks preformed in accordance with DP-8540. Instrument response checks shall be performed prior to and after use for the E-600 w/SPA-3 and once per shift for the Portable ISOCS. Any flags encountered during the ISOCS QC Source Count must be corrected/resolved prior to surveying. If anomalies cannot be resolved, contact the Cognizant FSS Engineer for assistance.
associated with the FSS in Survey Unit 01 are addressed in the JHA for NOL-02-0 1.
participating in this survey shall be trained in accordance with DP-8868.
11 SPECIFIC INSTRUCTIONS II
- 1. ISOCS measurements will be performed in accordance with DP-887 1 "Operation of the Canberra Portable ISOCS".
Grid NOL-02-01 for 100% scan coverage by placing markers 3 meters on center in rows no more than 3 meters apart with every other row shifted 1 % meters off axis from the adjacent row forming a triangular scan grid pattern or place parallel rows of markers forming a square pattern at a maximum distance of 2.6 meters apart. Continue marking the survey unit until there are no markers greater than 1.3 meters from the boundary of NOL-02-0 1 (add additional scan points closer than 3 meters apart as necessary). Using the 90' collimator, position the ISOCS detector directly at each marker 2 meters from the surface to be scanned. Angle the detector as necessary
~emendicular to the scan surface and ~erform an analvsis in accordance with DP-8871
employing a pre e count time sufficient to meet the MDAs referenced in this survey p l a n. & k ~ ~ ~ ~
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the report and verify that the MDAs have been met for the nuclides. Identify radionuclides representing licensed radioactive material and compare their concentration to their respective DCGLEMc value. Record the ISOCS measurement location on the survey map using the appropriate FSS numbering protocol (e.g. NOL-02 xxx(sequentia1 number)-F-G).
Note: Only radionuclides associated with licensed material (i.e. nuclides listed in the LTP) will be assessed. Nuclides associated with natural background radiation will not be included in the assessment.
- 2. If an analysis of a survey area is equal to or greater than the investigation level then an investigation of that area shall be performed as follows:
11
- a. Further subdivide the survey area into equal sub-areas.
11
- b. Place a marker in the center of each sub-area.
- c. Lower the ISOCS detector to approximately 1 meter above the surface and center directly above the marker.
11
- d. Perform an analysis of that sub-area in accordance with DP-887 1.
11
- e. Repeat the analysis sequence for each of the sub-areas within the survey area.
- f. In lieu of using ISOCS for first level investigations, SPA-3 scanning may be used for first level investigations.
- 3. If SPA-3 scanning is utilized for initial scans (i.e. ISOCS scanning is inaccessible, etc.) FSS Technicians will perform scans by moving the SPA-3 detector at a speed 0.25 mls, keeping the probe within approximately three inches of the ground surface, and following a serpentine pattern that includes at least three passes across each square meter. The FSS Field Supervisor will time and monitor a minimum of 50% of these scans. When scanning and walking, a slow pace (i.e., 1 step per second) shall be used. Scanning will be performed in the rate-meter mode with the audible feature on. Using the headsets, surveyors will listen for upscale readings, to which they will respond by slowing down or stopping the probe to distinguish between random fluctuations in the background and greater than background readings. Location(s) where detectable-above-background scan readings are found will be investigated.
- 4. If ISOCS is used for investigations, and a sub-area is determined to contain radiologically elevated areas, then scan the sub-area with a SPA-3 to identify and determine the boundaries of the elevated area. SPA-3 investigative scanning is performed similar in manner as described in step 3 with the exception of the scan speed (move detector 2 to 3 inches per second) and the detector need not be moved in a serpentine pattern.
Note: Background levels for the SPA-3 should range between 10000 and 20000 cpm. If the background levels exceed 24000 cpm, contact a Radiological Engineer prior to comrnencing/continuing the scan with the SPA-3.
Note: Standing water may shield gamma contamination. Standing water should be removed from the excavation prior to scanning.
- 5. Once the elevated area, requiring an investigation, has been identified and bounded, locate the point of the highest SPA-3 reading within the bounded area and collect a one-liter soil sample for analysis. If a soil sample is collected during the first level investigation, the sample designation will consist of the next sequential measurement location code plus the letter "I" (for
investigation). For example, if a soil sample is collected during a first level investigation it will be designated NOL-0 1-02-0 16-F-I. If the investigation calls for more than one sample, sequentially number the investigation samples (e.g. NOL-0 1 0 17-F-I). A gamma analysis will be performed on all investigative soil samples. If it can be demonstrated that the presence of rocks and boulders is the cause of an increased count rate during a SPA-3 scan, record that finding form DPF-8856.2 and no soil sample is required. The responsible FSS Radiological Engineer will evaluate analysis of any investigation samples for the LTP suite of nuclides.
Detailed descriptions of investigative actions will be recorded on form DPF-8856.2 and the location of the investigation analyses along with the sample designation will be recorded on the survey map. The location description must provide sufficient detail (i.e.) to allow revisiting the spot at a later time.
All sample analysis will achieve the MDC values stated in the DQO section of this plan.
NOTIFICATION POINTS QA notification point(s) (yln) v*
QA Signaturemate:
(1) Dateltime of initial pre-survey briefing
/
(2) Dateltime of commencement of soil sampling
/
(3) Dateltime of first scan measurement
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(4) Dateltime of daily pre-survey briefing
/
- Email notification to trudeau@yankee.com with a copy to calsyn@yankee.com satisfies this step FSIpoint(s)(y/n)-
n FSS Radiological Engineer Signaturemate:
(1)
I (2)
I re "ate 7(74,L,~
S S ~adiolo&al Engineer Reviewed by 9.
Date g/dkc 1
Approved b Date
~ / Y / O C Inputs:
Scan speed:
0.25 mls MDCR = 1.38*sqrt(b)/sqrt(p)*t Where:
b = background counts in time t p = surveyor efficiency =
0.5 t = time the detector is above localized activity =
Assume:
Localized contam diam =
56 cm AF=
Area Factor Ei =
Scanning instrument efficiency (YA-REPT-00-0 I 5-04) f =
radionuclide fraction Cs-137 Co-,60 Ei =
188 1379 DCGL 3
1.4 f =
0.9 0.1 AF=
3.1 1.5 BKG BKGA MDCR MDC(fDCGLemc(l 0))
7000 261.3 845 5.41 E-01 8000 298.7 903 5.79E-01 9000 336.0 958 6.14E-01 10000 373.3 1010 6.47E-01 11000 410.7 1059 6.78E-01 12000 448.0 1106 7.09E-01 13000 485.3 1152 7.38E-01 14000 522.7 1195 7.65E-01 15000 560.0 1237 7.92E-01 16000 597.3 1278 8.18E-01 17000 634.7 1317 8.43E-01 18000 672.0 1355 8.68E-01 19000 709.3 1392 8.92E-01 2.24 s = 0.0373 min
Attachment I
Sample Plan Phase I
Area I X Coord Y Coord Label Value 0
0 0
NOL-02-01 0
0 0
0 0
0 0
0 0
0 0
0 Type Systematic Systematic Systematic Systematic Systematic Systematic Systematic Systematic Systematic Systematic Systematic Systematic Systematic Systematic Systematic Historical False False False False False False False False False False False False False False False
Final Status Survey Planning Worksheet Page 1 of 9 GENERAL SECTION Survey Area #: NOL-02 I Survey Unit #: 02 Survey Unit Name: Northeastern Upper RCA Yard FSSP Number: YNPS-FSSP-NOL02-02-00 PREPARATION FOR FSS ACTIVITIES Check marks in the boxes below signify affirmative responses and completion of the action.
1.1 Files have been established for survey unit FSS records.
KI 1.2 ALARA review has been completed for the survey unit.
See YA-REPT-00-003-05 1.3 The survey unit has been turned over for final status survey.
1.47~n initial DP-8854 walkdown has been performed and a copy of the completed Survey Unit Walkdown Evaluation is in the survey area file.
El 1.5 Activities conducted within area since turnover for FSS have been reviewed.
Based on reviewed information, subsequent walkdown:
IXI not warranted warranted Note: Based upon Rad Engineer walkdown at the Final Turnover If warranted, subsequent walkdown has been performed and documented per DP-8854.
OR The basis has been provided to and accepted by the FSS Project Manager for not performing a subsequent walkdown.
1.6 A final classification has been performed.
Classification: CLASS 1 CLASS 2 CLASS 3 DATA QUALITY OBJECTIVES (DQO) 1.0 State the problem:
Survey Area NOL-02-02 is adjacent to the previous site of the New Fuel Vault and surrounding areas east of the former Spent Fuel Pool. The soils located around and under these areas include backfill, overburden, and glacio-lacustrine till. Permeability to groundwater flow is varied with the till being the most impermeable and the backfill being the least impermeable. Geoprobe soil samples taken from around the SFP, NFV and IX Pit have shown amounts in excess of the DCGL values for Co-60, Cs-137 and Ag-108m and the subject soil was removed during excavation. Demolition activities have since been completed in NOL-02-02.
Post excavation remediation and Characterization Surveys have been performed in NOL-02-02.
01,,,,,
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,-A O, I r ) r l i-,.,i, L1IdlilGlG1lLilllull sSU11p1111g l1lulC;illGs 1GVGlS U l LU'UU IGSS lllilll U.UL pLlIg111 allu La-13 I ICVGlS less than 0.06 pCi/gm. Initial scans were performed using SPA-3 and ISOCS with remediation carried out at locations that indicated elevated levels of radioactivity.
Based upon the radiological condition of this survey area identified in the operating history, and DPF-8856.1 1
YNPS-FSSP-NOL02-02-00
as a result of the decommissioning activities performed to date, survey area NOL-02-02 is identified as a Class 1 Area.
The problem, therefore, is to determine whether the accumulation of licensed radioactive materials generated during plant operation, existing in Survey Unit NOL-02-02, meets the release criterion.
The planning team for this effort consists of the FSS Project Manager, FSS Radiological Engineer, Radiation Protection Manager, FSS Field Supervisor, and FSS Technicians. The FSS Radiological Engineer will make primary decisions with the concurrence of the FSS Project Manager.
2.0 Identify the decision:
The decision to be made can be stated "Does residual plant-related radioactivity, if present in the survey unit, exceed the release criteria?"
Alternative actions that may be employed are no action, investigation, resurvey, remediation and reclassification.
3.0 Identify the inputs to the decision:
Inputs to the decision include information that will be required to resolve the decision. The information will address such topics as:
Survey techniques and analytical methodologies selected to generate the required analytical data Types and number of samples required to demonstrate compliance with the release criterion Identification of the radionuclides-of-concern and their corresponding DCGLs The various aspects of the data such as quality and data sensitivity ensure accurate information is utilized in the testing of the hypothesis.
Sample media: soil Types of measurements: soil samples and 100% scans Radion uclides-of-concern : co60and ~s~~~
I Table 1 8.73 mremlyr DCGL SPA-3Scan MDCR and M D C O C G L d : See Attachment 1 DCGL: Co-60 4. 4 pCi/gm, Cs-137 = 3.O pCi/gm DCGLEMC lsocs : (20-60 = 1 5 pCi/gm, Cs-137 = 66 pCi/gm (Based on 1 m2 area)
DCGL
Radionuclidesfor analysis: All L,TP nuclides with the focus on co60 md c~~~~
ISOCS Nuclide Library: Library will include the gamma emitters listed in Table 2 Investigation Level for soil samples: Investigation Level for soil samples will be >DCGLEMc
-or- >DCGLw and a statistical outlier -or-a sum of DCGLm fractions >1.0
11 ~djusted investigation Level (DCGLEMd for ISOCS Measurements:
II II Cs-1 3 7 = 1.22pCilgm Note: The adjusted investigation levels for the ISOCS were derived by multiplying the DCGLEMc (DCGLw
- AF for a lm2 elevated area) by the ratio of MDAs obtained from the full field of view (38.5m2) relative to the MDA obtained for a lm2 area at the edge of the field of view as this leads to a conservative model. The values developed for the lm2 elevated area at the edge of the field of view used for the ISOCS scan investigative levels are sensitive enough to detect the elevated comparison.
Investigation Level for SPA-3E-600: Audible increases above background that are reproducible.
I MDCs for gamma analysis of soil samples:
II Table 2 II MDCs for gamma emitters The desired MDCs in the laboratory analysis of FSS soil samples should be the 10% values. If it is impractical to achieve those, the 50% DCGLw values must be achieved in the laboratory analysis of the FSS soil samples. ISOCS measurements will meet the 1040% DCGLEMc values for the gamma emitting nuclides listed in Table 2.
Nuclide CO-60 Nb-94 Ag-1 08m Sb-125 CS-134 CS-137 EU-1 52 EU-1 54 EU-1 55 MDCS for HTD nuclides: In addition to the MDC values listed above, the following MDC values will also be transmitted to the outside laboratory via the chain-of-custody form accompanying the FSS soil samples:
1040% DCGLw (pCi/gm 0.14-0.70 0.25-1.2 0.25-1.2 1.10-5.5 0.17-0.86 0.30-1.5 0.35-1.8 0.33-1.7 14-70
MDCs for Hard-to-Detect nuclides Table 3 Survey coverage: Scan measurements, or ISOCS (the primary method of scans), will provide a 100% coverage of the survey area I
QC checks and measurements: QC checks for the Portable ISOCS will be in accordance with DP-8869 and DP-8871. Two samples will be chosen as QC split samples and will be analyzed by an off-site laboratory for all LTP nuclides. Additionally, two samples will be analyzed twice in-house by gamma spectroscopy and the results compared.
4.0 Define the boundaries of the survey:
Survey Unit NOL-02-02 is located within the RCA and is bounded by NOL-02-04 on the north, NOL-02-0 1 on the west and NOL-02-03 on the south, and 00L-11-0 1 on the east.
5.0 Develop a decision rule:
Null hypothesis: The null hypothesis (H,), as required by MARSSIM, is stated and tested in the negative form: "Residual licensed radioactive materials in Survey Unit 02 exceeds the release criterion. The null hypothesis, as stated in this manner, is designed to protect the health of the public as well as to demonstrate compliance with the requirements set forth in the Yankee Rowe License Termination Plan. In general, hypothesis testing will result in the following assessments:
- a. If all of the sample data show that the soil concentrations of all plant-related LTP
/
nuclides are below the DCGLs and the sum of fractions for these nuclides are less than
unity, reject the null hypothesis (i.e. NOL-02-02 meets the release criteria).
- b. If the action levels are exceeded, then perform an investigation survey.
- c. If the average concentration is below the DCGL, but individual measurements exceed the DCGL then apply a statistical test to either accept or reject the null hypothesis.
- d. If the average concentration of any individual nuclide exceeds the DCGL or if the sum of fractions exceeds unity, then accept the null hypothesis (i.e. NOL-02-02 does not meet the release criteria).
6.0 Specify tolerable limits on decision errors:
Probability of type I (a) error: 0.05 Probability of type II(8) error: 0.05 LBGR: 0.93 7.0 Optimize Design:
Type of statistical test: WRS Test Sign Test Basis including background reference location (if WRS test is specified) : N/A Number of samples: 20 Random start, systematic triangular grid pattern.
Split Samples: Two samples will be split samples Hard-to-Detect analyses: Two samples sent for off-site analysis will be analyzed for all LTP hard-to-detect radionuclides referenced in this survey plan Sample Recounts: Two samples will be recounted on-site GENERAL INSTRUCTIONS
- 1. Soil samples will be collected in accordance with DP-8 120 in one-liter marinelli beakers.
Extraneous materials (e.g. vegetation, debris, rocks, etc.) will be removed prior to placing the soil into the marinellis.
- 2. Collect the unbiased soil samples at 20 systematic locations with a random start point.
- 3. Soil sample designation:
- a. FSS soil samples: NOL-02-02-00 1 -F through NOL-02-02-020-F.
- b. Samples NOL-02-02-005-F-S and NOL-02-02-008-F-S will be designated as split szrl-l A C - - C ii ---- ----- i---~i-- -rr--:
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p l ~ s S G l l l ~ U I 1 ~ 1 1 a1ldY sis uy L I ~ G UII slie lauu~iiuly lor all L 1 r uu~liu~s.
- c. The off-site gamma spec. results will be compared with the on-site results in accordance with DP-8864.
- 4. Two recount samples: NOL-02-02-004-F and NOL-02-02-011 -F will be counted twice on DPF-8856.1 6
YNPS-FSSP-NOL02-02-00
site and the results compared in accordance with DP-8864.
- 5. All soil samples will be received and prepared in accordance with DP-88 1 3.
- 6. Chain-of-Custody form will be used in accordance with DP-8123 for all the split samples.
- 7. The sampling locations will be identified using GPS. In cases where the location cannot be determined directly using GPS, an offset will be used to describe the distance and bearing from a known GPS location, Each location will be marked by a flag, either prior to or at the time of the sampling. The FSS Radiological Engineer or FSS Field Supervisor will guide the FSS Technician to the sample locations.
- 8. Survey instrument: Operation of the Portable ISOCS will be in accordance with DP-8871, with QC checks performed in accordance with DP-8869 and DP-8871. Operation of the E-600 w/SPA-3 will be in accordance with DP-8535, with QC checks preformed in accordance with DP-8540. Instrument response checks shall be performed prior to and after use for the E-600 w/SPA-3 and once per shift for the Portable ISOCS. Any flags encountered during the ISOCS QC Source Count must be corrected/resolved prior to surveying. If anomalies cannot be corrected or resolved, contact the Cognizant FSS Engineer for assistance.
- 9. The job hazards associated with the FSS in Survey Unit 02 are addressed in the accompanying JHA for NOL-02-02.
I
- 10. All personnel participating in this survey shall be trained in accordance with DP-8868.
11 INSTRUCTIONS
- 1. Locate and mark the measurement points at the locations shown on the attached map(s).
1.1. Any other measurement designations will be determined by the FSS Engineer.
11 2. Collect soil samples at the 20 locations specified on the map(s).
2.1. Soil samples are collected in accordance with DP-8120. Remove extraneous vegetation, debris, rocks, etc prior to placing the soil into the one-liter marinelli beaker.
2.2. Soil samples are to be received and prepared in accordance with DP-88 13.
2.2.1. Soil samples are to be analyzed onsite for easy-to-detect nuclides and associated MDCs as listed above(MDCs for gamma analysis of soil samples:).
2.3. Samples NOL-02-02-004-F and NOL-02-02-0 1 1 -F will be counted twice and the results evaluated in accordance with DP-8864.
2.4. Two soil sample, NOL-02-02-005-F and NOL-02-02-008-F will be split samples and the splits designated NOL-02-02-005-F-S and NOL-02-02-008-F-S respectively:
2.4.1. The results will be evaluated in accordance with DP-8864.
2.4.2. The Chain-of-Custody will be maintained in accordance with DP-8 123.
2.5. Send the following soils to the offsite lab for analysis of hard-to-detect nuclides and associated MDCs as listed above (MDCs for HTD nuclide:).
2.5.1. The split soil samples specified above. Do not dry split samples sent off-site for analysis.
11 2.6. Soil sample locations may be identified using GPS.
2.6.1. If the location cannot be determined directly using GPS, tape measurements from known reference points may be utilized.
2.6.2. Each location will be marked either prior to or at the time of the sampling.
2.6.3. The FSS Radiological Engineer or FSS Field Supervisor will guide the FSS Technician to the sample locations as necessary.
Scan 100% of the soil area using ISOCS at a lm height with 180' open collimation at the locations specified on the ISOCS map.
3.1. Operation of the Portable ISOCS will be in accordance with DP-887 1, with QC checks performed once per shift in accordance with DP-8869 and DP-887 1. Resolve flags encountered prior to survey.
3.2. Lay out the grid by placing parallel rows of markers forming a square pattern at a maximum distance of 4.0 m apart and a maximum of 2.0 m from the edge of each surface area.
3.2.1. As a prerequisite for scan grid point count acquisition, ensure all standing water, ice, and/or snow has been removed from the scan field of view. Incidental amounts of moisture occurring during the acquisition such as rain or snow are acceptable, since the short duration of a count (600 seconds) should not accumulate significant absorber interference.
3.2.2. Angle the detector as necessary perpendicular to the scan surface and perform an analysis in accordance with DP-8871 using a preset count time sufficient to meet the MDAs referenced in the survey plan.
3.2.3. Using the 180-degree open collimation configuration, position the ISOCS detector directly above (perpendicular to the reference plane) each marker lm from the surface to be scanned.
3.2.4. For areas where concrete walls or berms exist in the field of view, estimate the percentage of concrete in the field of view and record on the log sheet.
3.2.5. For areas with saturated soil, such as low points of mud holes, estimate the percentage of saturated soil in the field of view and record on the log sheet. Note: Investigation levels will be reduced on these locations by 20% per guidance in YA-REPT-00-018-05 Rev 0 to account for matrix moisture attenuation effects.
3.3. Review the report ensuring that the MDAs have been met.
3.4. Review the report for identified nuclides and compare values against the DCGLEMc.
Operation of the E-600 will be in accordance with DP-8535 4.1. QC checks will be performed in accordance with DP-8540.
4.2. Resolve flags encountered prior to survey.
All personnel participating in this survey shall be trained in accordance with DP-8868.
If an ISOCS measurement needs to be investigated, obtain additional radiological data as follows.
6.1. Scan the ISOCS footprint (3.5m radius) with a SPA-3 at approximately 9" or less per second in rate-meter mode with audible on.
6.2. If the SPA-3 background exceeds 16,800 cpm contact the FSS Engineer.
6.3. Mark the boundaries around any detected elevated areas in the soil.
6.4. Identifl the boundaries on the survey map.
6.5. Measure the total area of each outlined area in square centimeters.
6.6. Indicate on the map and the actual location the highest identified activity among all of the elevated areas.
6.7. Indicate the highest reading on the map for each elevated area.
11 6.8. At the highest reading in each elevated area:
II II 6.8.1. First, perform and record a SPA-3 reading.
II 6.8.2. Second, obtain a soil sample at that location.
6.8.3. Third, obtain a second SPA-3 reading in the same location and manner as the first.
6.9. Re-perform the ISOCS measurement.
- 7. If a direct measurement needs to be investigated, obtain additional radiological data as follows.
7.1.
Review ISOCS data which may or may not confirm that the soil sample direct measurement was in fact above the investigation level. Because direct measurement locations are usually not coincidentally directly below an ISOCS shot, one or more ISOCS shots may indicate the need to investigate single or multiple direct measurement locations.
7.2.
Scan a 2-meter radius footprint around the direct measurement location using a SPA3 at approximately 9" or less per second in rate-meter mode with audible on.
7.3. If the background exceeds 16,800 cpm contact the FSS Engineer.
7.4. Mark the boundaries around any detected elevated areas in the soil.
7.5. Identify the boundaries on the survey map.
7.6. Measure the total area of each outlined area in square centimeters.
7.7. Indicate on the map and at the actual location the highest identified activity among all of the elevated areas.
7.8. Indicate the highest reading on the map for each elevated area.
7.9. At the highest reading in each elevated area:
7.9.1.
First, perform and record a SPA-3 reading.
7.9.2.
Second, obtain a soil sample at that location.
7.9.3.
Third, obtain a second SPA-3 reading in the same location and manner as the first.
7.10. Obtain a second soil sample around and below the hole from where the first soil sample was obtained.
7.1 I. Re-perform the ISOCS measurement.
- 8. Document investigative actions on DPF-8856.2.
- 9. Upon completion of the survey:
9.1. Verify that MDAs have been met.
9.2. Assess nuclides listed in the LTP through the use of the unity rule.
9.3. Perform an investigation as indicated by the results of the actions listed above.
r~rqlfJ, Date b
Approved by
& C' Date _5/ / f i ~
Inputs:
Scan speed:
0.25 m/s MDCR = 1.38*sqrt(b)/sqrt(p)*t Where:
b = background counts in time t p = surveyor efficiency =
0.5 t = time the detector is above localized activity =
Assume:
Localized contam diam =
56 cm AF=
Area Factor Ei =
Scanning instrument efficiency (YA-REPT-00-015-04) f =
radionuclide fraction CS-137 CO-60 Ei =
188 379 DCGL 3
1.4 P =
0.5 f =
0.72 0.28 AF=
3.1 1.5 BKG BKG/t MDCR MDC(fDCGLemc(l 0))
7000 261.3 845 6.45E-01 8000 298.7 903 6.90E-01 9000 336.0 958 7.32E-01 I0000 373.3 1010 7.71 E-01 I1000 410.7 1059 8.09E-01 12000 448.0 1106 8.45E-01 13000 485.3 1152 8.79E-01 14000 522.7 1195 9.13E-01 15000 560.0 1237 9.45E-01 16000 597.3 1278 9.76E-01 16800 627.2 1309 1.00E+00 17000 634.7 1317 1.O1 E+00 18000 672.0 1355 1.03E+00 19000 709.3 1392 1.06E+00 20000 746.7 1428 1.09E+00 21000 784.0 1464 1.12E+00 22000 821.3 1498 1.14E+00 23000 858.7 1532 1.17E+00 24000 896.0 1565 1.19E+00 25000 933.3 1597 1.22E+00
Final Status Survey Planning Worksheet Page 1 of 9 Survey Area No.: NOL-02 I Survey Unit No.: 03 Survey Unit Name: Northeastern Upper RCA Yard FSSP Number: YNPS-FSSP-NOL02-03-00 PREPARATION FOR FSS ACTIVITIES Check marks in the boxes below signify affirmative responses and completion of the action.
1.1 Files have been established for survey unit FSS records.
0 1.2 ALARA review has been completed for the survey unit.
Fl Refer to YA-REPT-00-003-05 1.3 The survey unit has been turned over for final status survey. 0 1.4 An initial DP-8854 walkdown has been performed and a copy of the completed Survey Unit Walkdown Evaluation is in the survey area file.
El 1.5 Activities conducted within area since turnover for FSS have been reviewed. El Based on reviewed information, subsequent walkdown:
0 not warranted El warranted If warranted, subsequent walkdown has been performed and documented per DP-8854.
OR The basis has been provided to and accepted by the FSS Project Manager for not performing a subsequent walkdown.
1.6 A final classification has been performed.
Classification: CLASS 1 El CLASS 2 CLASS 3 DATA QUALITY OBJECTIVES (DQO) 1.0 State the problem:
Survey Area NOL-02 consists of the surface area of Northeast Upper RCA Yard. The open land area is owned by YNPS and is comprised of soil. Survey Unit NOL-02-03 is a sub unit of survey area NOL-02 and is bordered by NOL-02-01 & 02 to its north, 00L-11-02 to its east, NOL-05-02 to its west and NSY-07 &
NOL-03 to its south. It is approximately 469 square meters of surface area.
The problem as defined by this survey plan is to demonstrate that the years of plant operation did not result in an accumulation of plant-related radioactivity that exceeds the release criteria.
The planning team for this effort consists of the FSS Project Manager, FSS Radiological Engineer, FSS Field Supervisor, and FSS Technicians. The FSS Radiological Engineer will make primary decisions with the concurrence of the FSS Project Manager.
2.0 Identify the decision:
Does residual plant-related radioactivity, if present in the survey unit, exceed the release criteria? Alternative actions may include no action, investigation, resurvey, remediation and reclassification.
DPF-8856.1 Page 1 of 9 YNPS-FSSP-NOL-02-03-00
Sample media:
Types of measurements:
Radionuclides-of concern:
DPF-8856.1 Page 2 of 9 Soil Soil samples, ISOCS Assays and gamma scans Co-60, Cs-137 3.0 Identify the inputs to the decision:
YNPS-FSSP-NOL-02-03-00 Applicable DCGL:
Nuclide Co-60 Nb-94 Agl08m Sb125 The DCGLs applied under this survey plan correspond to annual doses of 8.73 mredy (the 10-mremly DCGL adjusted for the dose contributions from sub-surface concrete structures and tritium in ground water).
DCGL (pcilg) 1.4E+O 2.5E+O 2.5E+O l.lE+l Nuclide Eu-152 Eu-1 54 Eu-155 H-3 Cs-1 37 DCGL (pcilg) 3.6E+O 3.3 E+O 1.4E+2 1.3E+2 Twenty-five (25) samples from the HSA data were used to provide the characterization data for survey unit NOL-02-03. The data is sufficient to support FSS planning of Survey Unit NOL-02-03.
Based on a review of the characterization data, Co-60 and Cs-137 are the only plant-related radionuclides that were identified consistently in the characterization samples analyzed. The results from the characterization data are summarized below:
Co-60 (1 1 detects)
Co-60 is present in 44 % of the characterization samples.
Cs-137 (10 detects)
Cs-137 is present in 40 % of the characterization samples.
Other YNPS ETD There were no other easy to detect nuclides identified >MDA.
YNPS HTD There were no hard to detect nuclides identified in the four samples analyzed.
The presence of all LTP-listed radionuclides (gamma-emitters, HTD beta-emitters, and TRUs) in the soil will be evaluated under this survey plan. The YNPS Chemistry Dept. will analyze each FSS soil sample for all LTP-listed gamma-emitting nuclides, except Cm-2431244. In addition, two (2) FSS soil samples will be sent to an independent laboratory for analyses of gamma-emitters, HTD beta-emitting radionuclides, and alpha-emitting radionuclides, which will include Cm-2431244.
Survey Design /Release Criteria Classification:
Class 1 Average Co-60 concentration:
0.050 pCi1g Standard deviation Co-60 (a):
0.087 pCi/g Average Cs-13 7 concentration:
0.104 pCi/g Standard deviation Cs-13 7 (a):
0.169 pCi/g Weighted sum (a):
0.084 Surrogate DCGL:
NIA (a surrogate DCGL will not be used) 3.OE+O Nuclide Sr-90 Tc-99 Pu-23 8 Pu-2391240 Fe-55 Ni-63 DCGL (pcilg) 6.OE-1 5.OE+O 1.2E+1 1.1 E+ 1 1.OE+4 2.8E+2 Am-24 1 Cm-2431244 1.OE+ 1 1.1E+1
LBGR Number of Samples Survey Unit Area Grid Area (A/N)
DCGLEMc: CO-60 DCGLEMc: CS-13 7 Investigation Level for soil samples:
ISOCS Assay Coverage:
Investigation Level for ISOCS measurements:
MDC's for ISOCS measurements:
SPA-3 Gamma Scan Coverage:
Investigation Level for SPA-3 Scans:
Radionuclides for analysis:
Initial = OSXDCGL = 0.5 Adjusted = 0.83 1
Calculated = 15 469 rn2 3 1.27 rn2 2.1 pCi/g (based on AF = 1.5) 9.3 pCi/g (based on AF = 3.1)
>DCGLEMc for either Co-60, Cs-137 -or-e A sum of DCGLE~c fractions > 1.0 -or-e
>DCGL for Co-60, Cs-137 and a statistical outlier as defined in the LTP.
Note: The same criteria will be applied to any other LTP-listed nuclide if identified in the soil samples.
100% of the surface area, ensured by overlapping field-of-views using ISOCS in the lrn-detector height with 180' open collimation configuration.
0.18 pCi/g Co-60 (reference document YA-EVAL-00-001-06) 0.70 pCi/g Cs-137 (reference document YA-EVAL-00-001-06)
-or-a sum of their fractions >1.0 Note: The investigation levels for the ISOCS assays were derived by multiplying the DCGLEMc associated with a lm2 area by the ratio of the MDC for the full field of view (38.5m2) to the MDC for a lm2 area at the edge of the full field of view. Additional details regarding the investigation levels for ISOCS assays can be found in YA-REPT-OO-018-05. The investigation levels developed in this manner are sensitive enough to detect the DCGLEMC values based on the grid area.
I I MDC 1
I MDC I
I MDC (11 SPA-3 scans will be performed for surface soil within the field-of-view of an ISOCS assay or surrounding a FSS sample location that exceeds the investigation criteria. The SPA-3 scan will cover 100% of the ISOCS assay total field-of-view area (38.5m2) or a 1-rn radius around the FSS sample location (3.1 4m2).
Nuclide Co-60 Nb-94 Reproducible indication above background using SPA-3 and audible discrimination.
The expected background range for SPA-3 scans is between 7,000 cprn and 15,000 cpm.
All LTP nuclides with the focus on Co-60 and Cs-137.
11 (pCi/g) 1. ~ ~ - 0 1 2.6"-0 1 DPF-8856.1 Page 3 of 9 YNPS-FSSP-NOL-02-03-00 Sb-125 Cs-134 1.0'+00 3.oh-0 1 Eu-152 Eu-154 4.1'-01 3.8 -01 1
MDCs for gamma analysis of Nuclide 10% - 50% of DCGL (pCi/&
soil samples:
Co-60 1.4E 7.OE-01 Nb-94 2.5E 1.3E+00 Ag-1 08m 2.5E 1.3E+00 Sb-125 1.1 E+00 - 5.6E+00 CS-I34 1.7E 8.7E-01 CS-1 37 3.OE 1.5E+00 Eu-1 52 3.6E 1.8E+00 Eu-1 54 3.3E 1.7E+00 Eu-1 55 1.4E+0 1 - 6.9E+01 The desired MDCs in the laboratory analyses of FSS soil samples will be the 10% DCGL values. If it is impractical to achieve those, the 50%
DCGL values must be achieved in the laboratory analyses of the FSS soil samples.
Nuclide H-3 C-14 Fe-55 Ni-63 Sr-90 Tc-99 Pu-238 Pu-239 Pu-24 1 Am-24 1 Cm-243 10% - 50% DCGL (pCi/g) 1.3E+01 - 6.4E+01 1.9E 9.7E-01 1.OE+03 - 5.1E+03 2.8E+01 - 1.4E+02 6.OE 3.OE-01 5.OE 2.5E+00 1.2E+00 - 5.8E+00 1.1E+00 - 5.3E+00 3.4E+01 - 1.7E+02 1.OE+00 - 5.1 E+00 1.1E+00 - 5.6E+00 The MDC values for difficult to detect nuclides will be conveyed to the outside laboratory via the sample chain-of-custody form DPF-8823.1 which will accompany the soil samples.
MDCR for SPA-3:
The accompanying table in Attachment 1 provides MDCR values by various background levels.
MDC ~CGL,,wcyo,,,cJ for SPA-3 The accompanying table in Attachment 1 provides MDC values by scans:
various background levels.
QC checks and measurements:
QC checks for ISOCS will be in accordance with DP-8869 and DP-887 1.
QC checks for the Leica GPS will be performed in accordance with DP-8859.
QC checks for the SPA-3 will be performed in accordance with DP-8504.
Two QC split samples will be collected (note: this is in accordance with and exceeds DP-8852 requirements.)
One QC recount for soil samples will be performed by the YNPS Chemistry Lab (note: this is in accordance with DP-8852 requirements.)
DPF-8856.1 Page 4 of 9 YNPS-FSSP-NOL-02-03-00
DPF-8856.1 Page 5 of 9 4.0 Define the boundaries of the survey:
Boundaries of Survey Unit NOL-02-03 are as shown on the attached map. This area is bordered by NOL-02-01 & 02 to its north, 00L-11-02 to its east, NOL-05-02 to its west and NSY-07 & NOL-03 to its south.
The survey will be performed under appropriate weather conditions (as defined by instrumentation limitations and human tolerance). Surveys may be performed on any shift of work.
5.0 Develop a decision rule:
Upon review of the FSS data collected under this survey plan:
(a) If all the sample data show that the soil concentrations of plant related nuclides are below the 8.73 mremlyear DCGLs and the sum of fractions of nuclides are below unity, then reject the null hypothesis (i.e., Survey Unit NOL-02-03 meets the release criteria).
(b) lfthe investigation levels are exceeded, then perform an investigation survey.
(c) If the average concentration of any LTP-listed nuclide exceeds its respective DCGL, or the average sum of fractions for any LTP-listed nuclide exceeds one, then accept the null hypothesis (i.e., Survey Unit NOL-02-03 fails to meet the release criteria).
Note: Alternate actions beyond investigations are not expected to be necessary within this survey unit.
6.0 Specifv tolerable limits on decision errors:
YNPS-FSSP-NOL-02-03-00 Null hypothesis:
Probability of type I error:
Residual plant-related radioactivity in Survey Unit NOL-02-03 exceeds the release criteria.
0.05 LBGR:
The applicable soil (8.73-mremly) DCGL + 2 LBGR = 0.5 (Unity Rule) 7.0 Optimize Design:
Type of statistical test: WRS Test Sign Test Pl (background will not be subtracted)
Number and Location of Samples: Fifteen (1 5) soil samples will be collected at locations based on a random start, systematic triangular grid (refer to accompanying DPF-8853.2).
Biased samples: A minimum of two (2) biased sample locations will be selected before, or at the time of sample collection and their locations will be added to the map, with the letter "B" added to the sample number. The addition of these samples and the relocation of any samples may be added to the map without requiring a revision. The coordinates of the biased sample locations will be determined and added to the record.
Biased sample locations: The two (2) biased sample locations will be determined in the field by the Rad Engineer based on historical data and process knowledge of the area.
GENERAL INSTRUCTIONS
Where possible, measurement locations will be identified using GPS in accordance with DP-8859. Each location will be marked to assist in identifying the location. Any locations that are not suitable for soil sampling will be relocated to the nearest suitable location and documented in the field log in accordance with DP-8856.
Soil samples will be collected in accordance with DP-8120.
II Chain of Custody form will be used in accordance with DP-8123 for all soil samples sent to an off-site laboratory.
H All soil samples will be received and prepared in accordance with DP-8813. Note: Split samples to be sent to an off-site lab will not be dried prior to counting on site or shipping.
Collect ISOCS measurements in accordance with DP-8871 to provide 100% scan coverage of the survey unit.
Survey instrument: Operation of the E-600 w1SPA-3 will be in accordance with DP-8535 with QC checks performed in accordance with DP-8504. The instrument response checks shall be performed before issue and after use.
All SPA-3 scans will be performed with the audible feature activated. FSS Technicians will listen for upscale readings to which they will respond by slowing down or stopping the probe to distinguish between random fluctuations in the background and greater than background readings.
The job hazards associated with the Survey described in this package are addressed in the accompanying Job Hazard Assessment (JHA) for NOL-02-03.
I/
All personnel participating in this survey shall be trained in accordance with DP-8868.
SPECIFIC INSTRUCTIONS
- 1. All designated measurement locations will be identified by GPS per DP-8859 or by use of reference points and tape measure as necessary. If a designated sample location is obstructed for any reason, the FSS Radiological Engineer or the FSS Field Supervisor will select an alternate location in accordance with DP-8856. A detailed description of the alternate location will be recorded on form DPF-8856.2, the survey unit map will be annotated appropriately, and the alternate location will be conspicuously marked to facilitate re-visiting to identify and record the coordinates with GPS in accordance with DP-8859 or by measurement from a known reference point when GPS is not available.
11 2. Sample Requirements:
II Collect two (2) biased l-liter soil samples in accordance with DP-8120. The radiological engineer assigned to this survey unit will determine the locations of the biased samples.
1 Collect fifteen (1 5) random l-liter soil samples in accordance with DP-8120. Two (2) of the fifteen (1 5) random soil samples will be analyzed as QC split samples to fulfill the QC requirement of DP-8852. The same QC split samples will also be analyzed for Hard-to-Detect nuclides in accordance with section 5.6.3.2.1 of the LTP and DP-8856.
Page 6 of 9
- 3. Soil Sample Designation:
YNPS-FSSP-NOL-02-03-00 FSS soil samples:
Biased soil samples:
NOL-02-03-00 1 -F through NOL-02-03-0 15-F corresponding to FSS sample locations 00 1 through 01 5.
NOL-02-03-016-F-B through NOL-02-03-017-F-B corresponding to the biased sample locations 016 and 01 7.
DPF-8856.1 Page 7 of 9 QC split samples:
Recount samples:
YNPS-FSSP-NOL-02-03-00 NOL-02-03-009-F-S and NOL-02-03-012-F-S are to be designated as QC split samples. These samples will be sent to the off-site laboratory as collected from the field (i.e., without drying). YNPS Chemistry will count these samples in the "wet" condition prior to shipment to the offsite laboratory.
NOL-02-03-008-F-RC is to be counted twice on site. The results will be compared in accordance with DP-8864.
- 4. Sample Analysis:
Gamma analysis will be performed on all soil samples. If any of the gamma analyses show that an investigation level has been exceeded an investigation survey will be conducted at that sample location as directed in specific instruction # 6.
YNPS Chemistry will analyze NOL-02-03-001 -F through NOL-02-03-015-F and NOL-02-03-016-F-B and NOL-02-03-017-F-B for gamma-emitting nuclides.
YNPS Chemistry will analyze NOL-02-03-008-F as a sample recount. The recounted sample will possess the naming convention NOL-02-03-008-F-RC.
YNPS Chemistry will analyze NOL-02-03-009-F-S and NOL-02-03-012-F-S for gamma-emitting nuclides prior to being sent to the off-site laboratory. These samples will be analyzed for gamma-emitting nuclides and HTD at the off-site laboratory.
On-site gamma analysis of the FSS samples shall achieve the MDC values stated in the DQO section of this plan. The MDC's will be communicated to the laboratory using an attachment to the Chain-of-Custody form.
- 5. ISOCS Assays.
Collect the appropriate number of ISOCS measurements in accordance with DP-8871 to provide 100% scan coverage of the survey unit.
ISOCS investigation levels are based on specific spacing of ISOCS assays. ISOCS assays, when using the 180" collimator at 1 -meter, are restricted to:
(a) A maximum spacing of 4 meters between assay locations.
(b) A maximum spacing of 2 meters from any survey unit boundary.
Note: Use reference document YA-EVAL-00-001-06 for ISOCS investigation levels.
ISOCS assays are designated as NOL-02-03-xxx -F-G where "xxx" continues sequentially from the last number assigned to an FSS measurement.
QC checks shall be performed at least once per shift in accordance with DP-8869 and DP-8871.
Resolve flags encountered prior to survey.
ISOCS assays to be performed with 1 80° collimator at Im unless otherwise directed by the FSS Engineer. Make note on the daily survey journal (DPF-8856.2) if other geometries are used.
For ISOCS assay locations shown on map "ISOCS Scans", position the detector downward facing keeping the detector perpendicular to the ground.
Designate additional assay locations in continuing sequence from the last number assigned to an
FSS measurement. Record detailed information about additional assay locations on the daily survey journal.
If the results on any ISOCS assay exceed an investigation level, investigate the area within the field of view (7m diameter - 38.5m2 area for 180"-lm) for that assay as directed in Specific Instruction # 7.
Remove standing water prior to performance of ISOCS assays. Contact the FSS Engineer for directions if conditions are such that standing water cannot be removed.
- 6. If the results of any FSS sample (statistical andlor biased points) analysis exceed an investigation level, perform a first level investigation as follows:
Note: Detailed descriptions of investigation actions shall be recorded in the daily survey journal (DPF-8856.2).
Review ISOCS data for assays in which the sample requiring investigation may have been in the field of view.
Scan a lm radius footprint around the sample location with a SPA-3 in rate-meter mode moving the detector at a speed of 0.25m or less per second, keeping the probe at a distance of approximately 3" from the surface and following a serpentine path that includes at least 3 passes across each square meter. The area of scan should be increased as necessary to bound any areas of elevated activity identified.
Mark the boundaries around any detected elevated areas in the soil and identify the boundaries on a survey map. Measure the total area of each outlined area in square centimeters.
Mark the location of the highest identified activity for each of the elevated areas in the soil and on the survey map.
At each of the highest identified activity area o
Perform and record a 1-minute scaler mode SPA-3 measurement. Designate the reading as "NOL-02-03-xxx-F-SC-I" where "xxx" continues sequentially from the last number assigned to an FSS measurement.
o Obtain a soil sample at the location. Designate the sample as "NOL-02-03-xxx-F-I" where "xxx" continues sequentially from the last number assigned to an FSS measurement.
o Perform and record a post sample 1-minute SPA-3 measurement. Designate the reading as described above.
I I
- 7. If the results of an ISOCS assay exceed an investigation level, perform a first level investigation as follows:
Note: Detailed descriptions of investigation actions shall be recorded in the daily survey journal (DPF-8856.2).
Page 8 of 9 o
YNPS-FSSP-NOL-02-03-00 Scan the ISOCS footprint with a SPA-3 in rate-meter mode moving the detector at a speed of 0.25m or less per second, keeping the probe at a distance of approximately 3" from the surface
and following a serpentine path that includes at least 3 passes across each square meter.
r Mark the boundaries around any detected elevated areas in the soil and identify the boundaries on a survey map. Measure the total area of each outlined area in square centimeters.
Mark the location of the highest identified activity for each of the elevated areas in the soil and on the survey map.
At each of the highest identified activity area o Perform and record a 1-minute scaler mode SPA-3 measurement. Designate the reading as "NOL-02-03-xxx-F-SC-I" where "xxx" continues sequentially from the last number assigned to an FSS measurement.
o Obtain a soil sample at the location. Designate the sample as "NOL-02-03-xxx-F-I" where "xxx" continues sequentially from the last number assigned to an FSS measurement.
o Perform and record a post sample 1 -minute SPA-3 measurement. Designate the reading as described above.
Re-perform the ISOCS assay. Designate the assay as 'WOL-02-03-xxx-F-G-I" where "xxx" continues sequentially from the last number assigned to an FSS measurement.
Date 3 Reviewed by Date s//
k/0b Date S / ~ A / ~ L I
I DPF-8856.1 Page 9 of 9 YNPS-FSSP-NOL-02-03-00
YNPS-FSSP-NOL-02-03-00 SPA-3 Scan Table
Final Status Survey Planning Worksheet Survey Area #: NOL-02 I Survey Unit #: 04 Survey Unit Name: Northeast Upper RCA Yard Northern Section FSSP Number: YNPS-FSSP-NOL02-04-00 PREPARATION FOR FSS ACTIVITIES Check marks in the boxes below signify affirmative responses and completion of the action.
11 1.I Files have been established for survey unit FSS records.
[XI II 11 1.2 ALARA review has been completed for the survey unit.
[XI See YA-REPT-00-003-05 II 1 1.3 The survey unit has been turned over for final status survey.
[XI II 1.4 An initial DP-8854 walkdown has been performed and a copy of the completed Survey Unit Walkdown Evaluation is in the survey area file.
El 11 1.5 Activities conducted within area since turnover for FSS have been reviewed. [XI II II Based on reviewed information, subsequent walkdown:
[XI not warranted
[7 warranted II II~ote: Based upon Rad Engineer walkdown at the Final Turnover II If warranted, subsequent walkdown has been performed and documented per DP-8854. [7 OR The basis has been provided to and accepted by the FSS Project Manager for not performing a subsequent walkdown.
[7 11 1.6 A final classification has been performed.
[XI 11 I
Classification: CLASS I [XI CLASS 2 [7 CLASS 3 L
1.0 State the problem:
Survey Area NOL-02-04 is located northeast of the former Spent Fuel Pool building and east of the Alleyway. The footprint of NOL-02-04 was within the RCA. Systems that traversed the survey unit include a steel reinforced concrete ductbank for storm drain and fuel oil lines, and auxiliary service water. A rail spur to the containment structure ran through the survey unit.
Surface activities in the area included outdoor storage of radioactive material and entrance to
/egress from the RCA. Demolition activities have been completed in NOL-02-04, which included removal of subsurface systems and ductbanks, and the unit has been subjected to extensive remediation. There are some concrete remnants of the service building wall and the remnant of a support column within the survey unit. These concrete remnants will be surveyed and released under the Radiation Protection Program-Free Release procedure.
II Post excavation remediation surveys have been performed in NOL-02-04 using SPA-3 and ISOCS with remediation carried out at locations that indicated elevated levels of radioactivity.
DPF-8856.1 Page 1 of 9 YNPS-FS SP-NOL02-04-00
Based upon the radiological condition of this survey area identified in the operating history, and as a result of the decommissioning activities performed to date, survey area NOL-02-04 is identified as a Class 1 Area.
The problem, therefore, is to determine whether the accumulation of licensed radioactive materials generated during plant operation, existing in Survey Unit NOL-02-04, meets the release criterion.
The planning team for this effort consists of the FSS Project Manager, FSS Radiological Engineer, Radiation Protection Manager, FSS Field Supervisor, and FSS Technicians. The FSS Radiological Engineer will make primary decisions with the concurrence of the FSS Project Manager.
2.0 Identify the decision:
The decision to be made can be stated "Does residual plant-related radioactivity, if present in the survey unit, exceed the release criteria?"
Alternative actions that may be employed are investigation, remediation and re-survey.
3.0 Identify the inputs to the decision:
Inputs to the decision include information that will be required to resolve the decision. The information will address such topics as:
Survey techniques and analytical methodologies selected to generate the required analytical data Types and number of samples required to demonstrate compliance with the release criterion Identification of the radionuclides-of-concern and their corresponding DCGLs The various aspects of the data such as quality and data sensitivity ensure accurate information is utilized in the testing of the hypothesis.
11 sample media: soil 11 Types of measurements: soil samples and 100% scans 11 ~adionuclides-of-concern : CO" and CS'
Radionuclides-of-Concern were determined from the sample results for the FSS of NOL-0 1-04 (The survey unit adjacent to NOL-02-04). Additionally, the data utilized for the statistical information was taken from the FSS data.
DPF-8856.1 Page 2 of 9
Table 1 8.73 mremlyr DCGL Radionuclide Soil (pcitg)
Surrogate DCGLs (ISOCS): After evaluating previous offsite laboratory soil sample analysis results from previously completed FSS survey units for both ETD as well as HTD nuclides, the data suggests that developing surrogate DCGLs is not necessary, because significant HTD nuclides have not been identified at sufficient magnitudes which would significantly impact investigation levels.
DCGLEMc : Based on a contaminated source area of 1 m2 (see Table 1) for use during ISOCS scans. If necessary, the D C G L E ~ ~
will be recalculated if an actual area of elevated concentration is discovered with a source area greater than 1 m2.
I DPF-8856.1 YNPS-FSSP-NO1 Page 3 of 9
DPF-8856.1 Page 4 of 9 Table 1 MDC, DCGLw DCGL,, Investigation Level:
gamma analysis of soil and ISOCS measurements Investigation Level ISOCS (based on source area =
1 m2, 1 m, 180" open collimation wI4 meter grid spacing)
Soil (pcilg) 1.8E-0 1 2.6E-01 2.5E-01 1.OE+00 3.OE-01 7.OE-01 4.1E-01 3.8E-01 1.1E+01 1
Radionuclides for analysis: All LTP nuclides with the focus on co6' and cs13' ISOCS Nuclide Library: Library will include the gamma emitters listed in Table 2 Investigation Level for soil samples: Investigation Level for soil samples will be >DCGLEMc or >DCGLw and three times the standard deviation of the mean Investigation Level ( D C G L E ~ ~ )
for ISOCS Measurements: See Table 1 above.
Note: The investigation levels developed in this manner (in accordance with YA-EVAL 00 1-06) are sensitive enough to detect the DCGLEMc values based on the grid area. Thus for example the calculated 0.18 pCi/g investigation level for Co-60 is sensitive enough to detect the DCGLEMc of 15 pCi/g.
If other LTP-listed gamma-emitting radionuclides are identified in the ISOCS assays, the investigation level will be evaluated using the same criteria.
Investigation Level for SPA-3LE-600: Audible increases above background that are reproducible MDCs for ETD nuclides in soil samples and ISOCS: The desired MDCs for laboratory analysis of FSS soil samples should be 10% of the DCGLw. If it is impractical to achieve those, the 50% DCGL DCGLEMC lSOCS (based on source area =
1 m2)
Soil (pcilg) 1.5E+01 2.3E+O1 2.3E+01 1.OE+02 2.8E+01 6.6E+01 3.4E+01 3.2E+O 1 1.1 E+03 Nuclide Co-60 DCGLEMc 8.73 mredy with AF based on LTP App.6Q Soil (pCiIg) 2.1 E+00 3,3E+00 3.3E+00 1.4E+01 3.9E+00 9.3E+00 4.7E+00 4.3E+OO 1.8E+02
- DCGL, 8.73 mredy Soil (pCiIg) 1.4E+00 Range of Soil Sample MDC from desired 10% DCGL to required 50% DCGL Soil (pcilg) 1.4E-0 1 to 7.OE-01 2.5E-0 1 to 1.2E+00 2.5E-01 to 1.2E+00 1.1 E+00 to 5.5E+00 1.7E-0 1 to 8.OE-0 1 3.OE-01 to 1.4E+00 3.6E-01 to 1.7E+00 3.3E-01 to 1.6E+00 1.4E+01 to 6.9E+01 2.5E+00 Ag-108m Sb-125 Cs-134 Cs-1 37 Eu-152 Eu-154 Eu-155 2.5E+00 l.lE+OI 1.7E+00 3.OE+OO 3.6E+00 3.3E+00 1.4E+02
lvalues must be achieved. The required MDCs for ISOCS are shown in Table1 above.
MDCs for HTD nuclides in soil samples: In addition to the MDC values listed in Table 1, the MDC values in Table 2 will also be transmitted to the outside laboratory via the chain-of-custody form accompanying the FSS soil samples.
Soil Sample D C G L E ~
As noted in Table 1 above, the soil sample DCGLEMc has been calculated based on the geometry of the sampling grid, utilizing LTP Appendix 6Q to determine the Area Factor. The Co-60 and Cs-137 DCGLEMc have been used to determine the Gross Activity DCGLEMc of 2.7 pCi/g.
Table 2.
MDCs for Hard-To-Detect Nuclides in Soil Samples II SPA-3 Scan MDCR and MDC@CGLEMc): Refer to Attachment 1 for SPA-3 scan MDC values given a range of background values.
Survey coverage: Scan measurements, or ISOCS (the primary method of scans), will provide a 100% coverage of the survey area QC checks and measurements: QC checks for the Portable ISOCS will be in accordance with DP-8869 and DP-8871. Two samples will be chosen as QC split samples and will be analyzed by an off-site laboratory for all LTP nuclides. Additionally, two samples will be analyzed twice in-house by gamma spectroscopy and the results compared.
11 4.0 Define the boundaries of the survey:
Survey Unit NOL-02-04 is located within the RCA and is bounded by 00L-02-02, NOL-01-04 and 00L-12 on the north, NOL-01-04 and NOL-02-01 on the west, and NOL-02-02 on the DPF-8856.1 YNPS-FSSP-NOL Page 5 of 9
south and 00L-08-04 on the east.
Y A random-start systematic grid will define the soil sample locations. The ISOCS scans are 100% of the survey unit and the grid does not require a random start.
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Surveying of NOL-02-04 will be performed during both shifts, with adequate lighting, when weather conditions will not adversely affect the data acquisition.
I Null hypothesis: The null hypothesis (H,), as required by MARSSIM, is stated and tested in the negative form: "Residual licensed radioactive materials in Survey Unit NOL-02-04 exceeds the release criterion. The null hypothesis, as stated in this manner, is designed to protect the health of the public as well as to demonstrate compliance with the requirements set forth in the Yankee Rowe License Termination Plan. In general, hypothesis testing will result in the following assessments:
- a. If all of the sample data show that the soil concentrations of all plant-related LTP nuclides are below the DCGLs and the sum of fractions for these nuclides are less than unity, reject the null hypothesis (i.e. NOL-02-04 meets the release criteria).
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- b. If the action levels are exceeded, then perform an investigation survey.
- c. If the average concentration is below the DCGL, but individual measurements exceed the DCGL then apply a statistical test to either accept or reject the null hypothesis. I
- d. If the average concentration of any individual nuclide exceeds the DCGL or if the sum of fractions exceeds unity, then accept the null hypothesis (i.e. NOL-02-04 does not meet the release criteria).
6.0 Specify tolerable limits on decision errors:
Probability of type I (a) error: 0.05 Probability of type 11 (') error: 0.05 LBGR: 0.5 I1 7.0 Optimize Design:
Type of statistical test: WRS Test Sign Test IX]
Basis including background reference location (if WRS test is specified): N/A Number of samples: Twenty (20) direct measurement soil samples will be taken, with the triangular grid laid out from a random start point.
J ~ ~ l i t Samples: Two samples will be split samples DPF-8856.1 YNPS-FSSP-NOL02-04-00 Page 6 of 9
Hard-to-Detect analyses: Two samples sent for off-site analysis will be analyzed for all LTP hard-to-detect radionuclides referenced in this survey plan Sample Recounts: Two samples will be recounted on-site GENERAL INSTRUCTIONS
- 1. Soil samples will be collected in accordance with DP-8120 in one-liter marinelli beakers.
Extraneous materials (e.g. vegetation, debris, rocks, etc.) will be removed prior to placing the soil into the marinellis.
- 2. Collect the unbiased soil samples at 20 systematic locations with a random start point.
- 3. All soil samples will be received and prepared in accordance with DP-88 13.
- 4. Chain-of-Custody form will be used in accordance with DP-8 123 for all the split samples.
- 5. The sampling locations will be identified using GPS. In cases where the location cannot be determined directly using GPS, an offset will be used to describe the distance and bearing from a known GPS location, Each location will be marked by a flag, either prior to or at the time of the sampling. The FSS Radiological Engineer or FSS Field Supervisor will guide the FSS Technician to the sample locations.
- 6. Survey instrument: Operation of the Portable ISOCS will be in accordance with DP-8871, with QC checks performed in accordance with DP-8869 and DP-8871. Operation of the E-600 w1SPA-3 will be in accordance with DP-8535, with QC checks preformed in accordance with DP-8540. Instrument response checks shall be performed prior to and after use for the E-600 w1SPA-3 and once per shift for the Portable ISOCS. Any flags encountered during the ISOCS QC Source Count must be corrected/resolved prior to surveying. If anomalies cannot be corrected or resolved. contact the Cognizant FSS Engineer for assistance.
- 7. The job hazards associated with the FSS in Survey Unit 01 are addressed in the accompanying JHA for NOL-02-04.
- 8. All personnel participating in this survey shall be trained in accordance with DP-8868.
SPECIFIC INSTRUCTIONS
- 1. Soil sample designation:
- a. FSS soil samples: NOL-02-04-001-F through NOL-02-04-020-F.
- b. Samples NOL-02-04-009-F-S, NOL-02-04-011-F-S will be designated as split samples sent for full analysis by the off-site laboratory for all LTP nuclides.
- c. The off-site gamma spec. results will be compared with the on-site results in accordance with DP-8864.
- 2. Two recount samples: NOL-02-04-002-FIRC and NOL-02-04-016-FRC will be counted twice on site and the results compared in accordance with DP-8864.
DPF-8856.1 Page 7 of 9
- 3. Scan 100% ofthe soil area using ISOCS at a Im height with 180' open collimation at the locations specified on the ISOCS map.
- a. Operation of the Portable ISOCS will be in accordance with DP-8871, with QC checks performed once per shift in accordance with DP-8869 and DP-887 1. Resolve flags encountered prior to survey.
- b. Lay out the grid by placing parallel rows of markers forming a square pattern at a maximum distance of 4.0 m apart and a maximum of 2.0 m from the edge of each surface area. Numbering of the ISOCS scans will be sequential with the first scan number of NOL-02 10 I (Sequential number)-F-G.
a As a prerequisite for scan grid point count acquisition, ensure all standing water has been removed from the scan field of view. An incidental amount of moisture occurring during the acquisition such as rain is acceptable, since the short duration of a count (600 seconds) should not accumulate significant absorber interference. In isolated conditions where saturated soils are known to exist (i.e. a sheen exists on top of the soil), adjustments to account for higher densities may be utilized. One of two approaches can be applied to ISOCS measurements when the soil matrix in the scan area (Field of View) is determined to be saturated. As described in the Technical Basis Document one way is to adjust either the investigation level or the sample mass down by 20%.
The second way is to reanalyze the collected spectrum applying an efficiency calibration that accounts for the increased soil density.
Angle the detector as necessary perpendicular to the scan surface and perform an analysis in accordance with DP-8871 using a preset count time sufficient to meet the MDAs referenced in the survey plan.
Using the 180-degree open collimation configuration, position the ISOCS detector directly above (perpendicdar to the reference plane) each marker, 1 m from the surface to be scanned.
Add additional scan points closer than 4.0 m apart as necessary to achieve 100%
unit survey coverage, however, a fully documented GPS survey coordinate survey is required for any additional ISOCS scan points.
In deep holes, ISOCS may be used to survey vertical or sloping surfaces. As with horizontal surfaces, the ISOCS should be positioned perpendicularly lm from the surface.
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- c. Review the report ensuring that the MDAs have been met.
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- d. Review the report for identified nuclides and compare values against the DCGLEMc. I1
- 4. If SPA-3 scanning is utilized for initial scans (i.e. ISOCS scanning is inaccessible, etc.) FSS Technicians will perform scans by moving the SPA-3 detector at a speed 0.13 rnlsec. (5 in./sec), keeping the probe within approximately three inches of the ground surface, and following a serpentine pattern that includes at least three passes across each square meter.
The FSS Field Supervisor will time and monitor a minimum of 50% of these scans. When scanning and walking, a slow pace (i.e., 1 step per second) shall be used. Scanning will be performed in the rate-meter mode with the audible feature on. Using the headsets, surveyors will listen for upscale readings, to which they will respond by slowing down or stopping the probe to distinguish between random fluctuations in the background and greater than background readings. Location(s) where detectable-above-background scan readings are found will be investigated.
DPF-8856.1 YNPS-FSSP-NOL02-04-00 Page 8 of 9
i
~
o r
investigations, scan the area with a SPA3 to identify and determine the boundaries of the elevated area. SPA-3 investigative scanning is performed similar in manner as described in step 3 with the exception of the scan speed (move detector 2 to 3 inches per second) and the detector need not be moved in a serpentine pattern.
Note: Background levels for the SPA-3 should range between 10000 and 20000 cpm. If the background levels exceed 24000 cpm, contact a Radiological Engineer prior to cornrnencing/continuing the scan with the SPA-3.
Note: Standing water may shield gamma contamination. Standing water should be removed from the excavation prior to scanning.
- a. Once the elevated area, requiring an investigation, has been identified and bounded, locate the point of the highest SPA-3 reading within the bounded area and collect a one-liter soil sample for analysis. If a soil sample is collected during the first level investigation, the sample designation will consist of the next sequential measurement location code plus the letter "I" (for investigation). For example, if a soil sample is collected during a first level investigation it will be designated NOL-02-04-021-F-I. If the investigation calls for more than one sample, sequentially number the investigation samples (e.g. NOL-02-04-022-F-I). A gamma analysis will be performed on all investigative soil samples. If it can be demonstrated that the presence of rocks and boulders is the cause of an increased count rate during a SPA-3 scan, record that finding on form DPF-8856.2 and no soil sample is required. The responsible FSS Radiological Engineer will evaluate analysis of any investigation samples for the LTP suite of nuclides.
- b. Detailed descriptions of investigative actions will be recorded on form DPF-8856.2 and the location of the investigation analyses along with the sample designation will be recorded on the survey map. The location description must provide sufficient detail (i.e.)
to allow revisiting the spot at a later time.
- 6. All sample analysis will achieve the MDC values stated in the DQO section of this plan.
NOTIFICATION POINTS Prepared by Date 7 1 ad I 'h Reviewed b Date 74 d, 6'- d 6 Approved by Date 7 L!!
1 DPF-8856.1 Page 9 of 9 Random Generator for QA Splits and Recounts YNPS-FSSP-NOL-02-04-00 Worksheet to randomly select numbers Date Generated:
7/26/2006 Number of samples to choose among:
20 AreaIUnit: NOL-02-04 11 Split 9 Split 16 Recount 2 Recount 12 18 13 4
11 19 Directions:
- 1. Put the number of samples in the highlighted cell.
- 2. If one random number is needed, choose the 1st one.
- 3. If two random numbers are needed, choose the 1st two.
- 4. Etc.
- 5. If one of the selected numbers is a repeat, go to the next one.
- 6. After entering the number of samples, accept the first list. If you open it again, you will get a different list.
- 7. Print this page as a record.
YNPS-FSSP-NOL-02-04-00 SPA-3 Scan Tables Max Backaround Scan S ~ e e d u
I BKG(cpm) 4,000 5,000 6,000 7,000 8.000 InISec 39 20 13 10 8
MDCR 452 505 553 597 639 MDC(fDCGLemc) 4.81 E-01 5.38E-01 5.90E-0 1 6.37E-01 6.81 E-01 mISec 1.OO 0.50 0.33 0.25 0.20 BKG (cpm) 2,000 4,000 6,000 8,000 10,000
YNPS-FSSP-NOL-02-04-00 DCGL MDC Table