GNRO-2007/00024, Annual Radiological Environmental Operating Report (AREOR)
| ML071200209 | |
| Person / Time | |
|---|---|
| Site: | Grand Gulf  |
| Issue date: | 04/30/2007 |
| From: | Bottemiller C Entergy Operations |
| To: | Document Control Desk, NRC/NRR/ADRO |
| References | |
| GNRO-2007/00024 | |
| Download: ML071200209 (68) | |
Text
---Entwgy Entergy Operations, Inc.
Waterloo Road PO.Box 756 Port Gibson. MS 39150 Tel 601 437 6299 Charles A. Bottemiller Manager Plant Licensing GNRO-2007/00024 April 30, 2007 U.S. Nuclear Regulatory Commission Washington, D.C. 20555 Attention: Document Control Desk
Subject:
Grand Gulf Nuclear Station (GGNS) 2006 Annual Radiological Environmental Operating Report (AREOR)
Grand Gulf Nuclear Station Docket No. 50-416 License No. NPF-29 Ladies & Gentlemen:
In accordance with the Grand Gulf Nuclear Station Unit 1 Technical Specification 5.6.2, attached is the Annual Radiolouical Environmental Operatinu Report for the period January 1,2006 through December 31,2006.
This letter does not contain any commitments. If you have questions or require additional information concerning these reports, please contact Mr. Richard Scarbrough (601) 437-6316, or this office at (601) 437-6685.
Yours truly, A CAB/MJL attachment: 2006 Annual Radiological Environmental Operating Report cc: (See Next Page)
April 30, 2007 GNRO-2007-00024 Page 2 of 2 cc: NRC Senior Resident Inspector Grand Gulf Nuclear Station Port Gibson, MS 39150 U. S. Nuclear Regulatory Commission ATTN: Dr. Bruce S. Mallet (WE)
Regional Administrator, Region IV 61 1 Ryan Plaza Drive, Suite 400 Arlington, TX 7601 1-4005 U. S. Nuclear Regulatory Commission ATTN: Mr. Bhalchandra Vaidya, NRR/DLPM (WE)
ATTN: ADDRESSEE ONLY ATTN: U. S. Postal Delivery Address Only Mail Stop OWFN/ 0-7D1A Washington, DC 20555-0001
ENTERGY OPERATIONS, INC.
GRAND GULF NUCLEAR STATION ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT January 1,2006-December 31,2006 Prepared By Approved By
TABLE OF CONTENTS
SUMMARY
6 1.O INTRODUCTION 11 1.IRadiological Environmental Monitoring Program 11 1.2 Pathways Monitored 11 1.3 Land Use Census 12 2.0 INTERPRETATION AND TRENDS OF RESULTS 23 2.1 Air Particulate and Radioiodine Sample Results 23 2.2 Thermoluminescent Dosimetry (TLD) Sample Results 23 2.3 Water Sample Results 25 2.4 Sediment Sample Results 25 2.5 Milk Sample Results 26 2.6 Fish Sample Results 26 2.7 Food Product Sample Results 26 2.8 Land Use Census Results 27 2.9 lnterlaboratory Comparison Results 34 3.0 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM
SUMMARY
35 3.1 Program Results Summary 35 2
LIST OF TABLES TABLE 1.1 RADIOLOGICAL ENVIRONMENTAL SAMPLING PROGRAM 13 TABLE 2.1 LANDUSECENSUSRESULTS 29 TABLE 3.1 RADIOLOGICAL ENVIRONMENTAL MONITORING 36 PROGRAM
SUMMARY
3
LIST OF FIGURES FIGURE 1-1 EXPOSURE PATHWAYS 20 FIGURE 1-2 SAMPLE COLLECTION SITES - NEAR FIELD 21 FIGURE 1-3 SAMPLE COLLECTION SITES - FAR FIELD 22 FIGURE 2-1 TLD READINGS 24 4
LIST OF ATTACHMENTS ATTACHMENT 1 RADIOLOGICAL MONITORING REPORT 41
SUMMARY
OF MONITORING RESULTS 5
Summary The Annual Radiological Environmental Operating Report presents data obtained through analyses of environmental samples collected for Grand Gulf Nuclear Stations (GGNS)
Radiological Environmental Monitoring Program (REMP) for the period January 1, 2006 through December 31, 2006. This report fulfills the requirements of GGNS Technical Specification 5.6.2.
To supplement the REMP, GGNS personnel collected duplicate surface water, ground water, vegetation, sediment and fish samples during the reporting period. Special samples collected during the reporting period included direct radiation, vegetation and venison. GGNS did not detect any plant-related radionuclides in these samples.
Radiological Environmental Monitoring Program GGNS established the REMP in 1978 prior to the station becoming operational (1985) to provide data on background radiation and radioactivity normally present in the area. GGNS has continued to monitor the environment by sampling air, water, sediment, fish and food products, as well as measuring radiation directly. GGNS also samples milk if commercial milk production is occurring within five miles of the plant.
The REMP includes sampling indicator and control locations within an 18-mile radius of the plant. The REMP utilizes indicator locations near the site to show any increases or buildup of radioactivity that might occur due to station operation, and control locations farther away from the site to indicate the presence of only naturally occurring radioactivity. GGNS personnel compare indicator results with control and preoperational results to assess any impact GGNS operation might have had on the surrounding environment.
In the current year, GGNS personnel collected environmental samples for radiological analysis. They compared results of indicator locations with control locations and previous studies, and concluded that overall no significant relationship exists between GGNS operation and effect on the plant environs. Their review of current year data, in many cases, showed undetectable radiation levels in the environment and near background level in significant pathways associated with GGNS.
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Harmful Effects or Irreversible Damage The REMP monitoring did not detect any harmful effects or evidence of irreversible damage in the current year. Therefore, no analysis or planned course of action to alleviate problems was necessary.
Reporting Levels GGNS' review indicates that no samples equaled or exceeded reporting levels for radioactivity concentration in environmental samples, as outlined in ODCM Specifications Table 6.12.1-2 when averaged over any calendar quarter, due to GGNS effluents. Therefore, results did not trigger any Radiological Monitoring Program Special Reports.
Radioactivity Not Attributable to GGNS In previous years, the GGNS REMP detected radioactivity attributable to other sources twice.
These include the 25th Chinese nuclear test explosion in 1980, and the radioactivity plume release due to reactor core degradation at the Chernobyl Nuclear Power Plant in 1986.
Comparison to Federal and State Programs GGNS personnel compared REMP data to federal and state monitoring programs as results became available. Historically, the programs used for comparison have included the U.S.
Nuclear Regulatory Commission (NRC) TLD Direct Radiation Monitoring Network and the Mississippi State Department of Health (MSDH), Division of Radiological Health.
The NRC TLD Network Program was discontinued in 1998. Historically these results compared favorably to those from the GGNS REMP. GGNS TLD results remain similar to the historical average and continue to verify that plant operation is not affecting the ambient radiation levels in the environment.
The MSDH and the GGNS REMP entail similar radiological environmental monitoring program requirements. These programs include concurrent air sampling and splitting or sharing sample media such as water, sediment, fish and food products. Both programs have obtained similar results over previous years. The results of MSDH's monitoring program for the reporting period compared favorably with the GGNS REMP and did not indicate elevated levels of radiation or radioactivity build-up attributed to plant operations.
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Sample Deviations 4 Milk The REMP did not include milk sampling within five miles (8 km) of GGNS in the current year due to unavailability. ODCM Specifications require collection of milk samples if available commercially within 8 km ( 5 miles) of the plant. GGNS personnel collected vegetation samples to monitor the ingestion pathway, as specified in ODCM Specifications Table 6.12.1-1, because of milk unavailability.
4 Required Lower Limit of Detection (LLD) Values LLDs during this reporting period were within the acceptable limits required by the ODCM specifications.
8
+ Air Samples The following air sample locations had reduced run times due to weather-related outages or mechanical problems. As described in footnote (a) to ODCM Specification Table 6.12.1-1 , deviations from the required sampling schedule are permitted due to malfunction of sampling equipment and other legitimate reasons.
Out-of-Sample Date In Date Out RunTime service Comments Location hours hours AS-7 UH 0 1/ I 0/06 0 1/ I 7/06 166.95 1.02 Power Outage AS-1 PG 01131/06 02/07/06 165.46 2.54 Power Outage AS-7 UH 02/07/06 02114/07 167.29 0.93 Power Outage AS-7 UH 03/07/06 03114/06 157.38 8.69 Power Outage AS-7 UH 03114/06 03/21/06 166.56 1.41 Power Outage AS-7 UH 04/25/06 05/02/06 166.24 0.78 Power Outage AS-7 UH 07/04/06 07/11106 165.18 0.79 Power Outage AS-7 UH 07118/06 07/25/06 166.64 3.53 Power Outage AS-3 61VA 07/18/06 07/25/06 150.14 20.29 Power Outage AS-1 PG 07/25/06 08/0 1/06 165.83 1.52 Power Outage AS-7 UH 08/22/06 08/29/06 166.14 2.01 Power Outage AS-7 UH 10/03/06 10/10/06 162.91 0.81 Power Outage AS-7 UH 11/ I 4/06 11/21/06 158.67 2.23 Power Outage Based on the sample collection period reductions, air samples were collected the following percentages of the available time:
AS-I PG 99.95%
AS-3 61VA 99.77%
AS-7 UH 98.57%
+ TLDs TLD station M-49 (Outer Ring, Sector H, Radius 4.5 Miles) was displaced fkom its designated location by unknown causes during the lst quarter of 2006. This data was excluded from reporting. Although the 1 quarter exposure at location M-49 is unknown, GGNS ' review of results for similarly located TLDs indicated no abnormal readings.
TLD station M-17 (Inner Ring, Sector C,Radius 0.5 Miles) was noted as wet when collected for the 3rd quarter monitoring period. GGNS' review of results for similarly located TLDs indicated no abnormal readings. The 3'd quarter reading at location M-17 was consistent with previous and subsequent readings and the data was included in this report.
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Missed Samples One sample was missed due to a loss of a TLD. See page 9 of this report for additional information.
Unavailable Results GGNS received analytical results in adequate time for inclusion in this report. In addition, GGNS review identified no missing results.
Program Rlodifications No program modifications occurred during the reporting period.
Attachments contains results of TLD, air, water, sediment, fish, food products and special samples collected. TLDs were analyzed by Waterford-3 Dosimetry. All remaining samples were analyzed by River Bend Stations (RBS) Environmental Laboratory. Attachment 1 also contains RBS results from participation in the interlaboratory comparison program.
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1.0 Introduction 1.1 Radiological Environmental Monitoring Program GGNS established the REMP to ensure that plant operating controls properly function to minimize any associated radiation endangerment to human health or the environment. The REMP is designed for:
0 Analyzing important pathways for anticipated types and quantities of radionuclides released into the environment.
0 Considering the possibility of a buildup of long-lived radionuclides in the environment and identifylng physical and biological accumulations that may contribute to human exposures.
Considering the potential radiation exposure to plant and animal life in the environment surrounding GGNS.
0 Correlating levels of radiation and radioactivity in the environment with radioactive releases &om station operation.
1.2 Pathways Monitored The airborne, direct radiation, waterborne and ingestion pathways, as seen in Figure 1-1, are monitored as required by GGNS ODCM Table 6.12.1-1. A description of the GGNS REMP utilized to monitor the exposure pathways is provided in Table 1.1 and shown in Figures 1-2 and 1-3. GGNS may supplement this program with additional sampling in order to provide a comprehensive and well-balanced program.
Section 2.0 of this report provides a discussion of sampling results with Section 3.0 providing a summary of results for the monitored exposure pathways.
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1.3 Land Use Census GGNS personnel conduct a land use census biannually, as required by ODCM Specification 6.12.2. Data for the most recent land use census is included. The purpose of this census is to identify changes in uses of land withn five miles of GGNS that would require modifications to the REMP or the ODCM The most important criteria during this census are to determine location in each sector of the nearest:
- 1) Residence
- 2) Animal milked for human consumption 2 2
- 3) Garden of greater than 50 m (500 ft ) producing broadleaf vegetation.
When performed, GGNS personnel conduct the land use census by:
0 Field surveys in each meteorological sector out to five miles in order to confirm:
9 Nearest permanent residence 9 Nearest unoccupied residence 9 Nearest garden and approximate size 9 Nearest milking animal.
0 Identifylng locations on maps, measuring distances to GGNS and recording results on surveillance data sheets.
0 Comparing current land use census results to previous results.
Contacting the Claiborne County Agent for verification of nearest dairy animals.
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Table 1.1 Radiological Environmental Sampling Program Requirement Sample Point Description, Sampling and Type and Frequency Pathway Distance and Direction Collection Frequency Of Analyses Radioiodine and Particulates Airborne 1 sample close to the SITE AS-7 UH (Sector H, Radius 0.5 Miles) - Continuous sampler operation Radioiodine Cannister 131; BOUNDARY having the highest South-southeast of GGNS at the IBEW with sample collection per 7 7 days salculated annual average Union Hall.
days or as required by dust groundlevel D/Q.
loading, whichever is more Particulate Sampler - Gross frequent beta radioactivity following filter change, composite (by location) for gamma isotopic; 92 days Radioiodine and Particulates 1 sample from the vicinity of a AS-1 PG (Sector G, Radius 5.5 Miles) -
community having the highest Southeast of GGNS at the Port Gibson City calculated annual average Barn.
groundlevel D/Q.
Radioiodine and Particulates AS-3 61VA (Sector B, Radius 18 Miles) -
1 sample from a control location 15 - North-northeast of GGNS on Hwy 61, 30 km ( I 0 - 20 miles) distance. North of the Vicksburg Airport.
Direct TLDs Radiation An inner ring of stations in the M-16 (Sector A, Radius 0.9 Miles) - 92 days Gamma dose; 92 days general areas of the SITE Meteorological Tower.
BOUNDARY.
M-17 (Sector C, Radius 0.5 Miles) -
South Side, Grand Gulf Road.
M-19 (Sector E, Radius 0.5 Miles) -
Eastern SITE BOUNDARY Property line, North-northeast of HWSA.
13
Table 1.1 Radiological Environmental Sampling Program Exposure Requirement Sample Point Description, Sampling and Type and Frequency Pathway Distance and Direction Collection Frequency Of Analyses Direct TLDs Radiation An inner ring of stations in the M-21 (Sector J, Radius 0.4 Miles) - Near 92 days Gamma dose; 92 days general areas of the SITE Former Training Center Building on Bald BOUNDARY. Hill Road.
M-22 (Sector G, Radius 0.5 Miles) -
Former RR Entrance Crossing On Bald Hill Road.
M-23 (Sector Q, Radius 0.5 Miles) - Gin Lake Road 50 Yards North of Heavy Haul Road on Power Pole.
M-25 (Sector N, Radius 1.6 Miles) -
Radial Well Number 1.
M-28 (Sector L, Radius 0.9 Miles) -
Former Glodjo Residence.
M-94 (Sector R, Radius 0.8 Miles) -
Sector R Near Meteorological Tower.
TLDs An outer ring approximately 3 to 5 M-36 (Sector P, Radius 5.0 Miles) -
miles from the site. Curve on HW 608, Point Nearest GGNS at Power Pole.
M-40 (Sector M, Radius 2.3 Miles) -
Headly Drive, Near River Port Entrance.
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Table 1.1 Radiological Environmental Sampling Program Exposure Requirement Sample Point Description, Sampling and Type and Frequency Pathway Distance and Direction Collection Frequency Of Analyses Direct TLDs Radiation An outer ring approximately 3 to 5 M-48 (Sector K, Radius 4.8 Miles) - 0.4 92 days Gamma dose; 92 days miles from the site. Miles South on Mont Gomer Road on West Side.
M-49 (Sector H, Radius 4.5 Miles) - Fork in Bessie Weathers RoadlShaifer Road.
M-50 (Sector B, Radius 5.3 Miles) - Panola Hunting Club Entrance.
M-55 (Sector D, Radius 5.0 Miles) - Near Ingelside Karnac Ferry Road/Ashland Road Intersection.
M-57 (Sector F, Radius 4.5 Miles) - Hwy 61, Behind the Welcome to Port Gibson Sign at Glensdale Subdivision.
TLDs 8 stations in special interest areas M-01 (Sector E, Radius 3.5 Miles) - Across such as population centers, nearby the road from Lake Claiborne Entry Gate.
residences, schools, and in 1 or 2 (Special Interest) areas to serve as control stations.
M-07 (Sector G, Radius 5.5 Miles) - AS-I PG, Port Gibson City Barn. (Special Interest)
M-09 (Sector D, Radius 3.5 Miles) - Warner Tully Y-Camp. (Special Interest)
M-10 (Sector A, Radius 1.5 Miles) - Grand Gulf Military Park. (Special Interest) 15
Table 1.1 Radiological Environmental Sampling Program Exposure Requirement Sample Point Description, Sampling and Type and Frequency Pathway Distance and Direction Collection Frequency Of Analyses Direct TLDs Radiation 8 stations in special interest areas M-14 (Sector B, Radius 18.0 Miles) - AS 92 days Gamma dose; 92 days such as population centers, nearby 61VA, Hwy 61, North of Vicksburg Airport.
residences, schools, and in 1 or 2 (Control) areas to serve as control stations M-33 (Sector P, Radius 12.5 Miles) -
Newellton, Louisiana Water Tower. (Special Interest)
M-38 (Sector M, Radius 9.5 Miles) - Lake Bruin State Park, Entrance Road. (Special Interest)
M-39 (Sector M, Radius 13.0 Miles) - St.
Joseph, Louisiana, Auxiliary Water Tank.
(Special Interest) 16
Table 1.1 Radiological Environmental Sampling Program Exposure Requirement Sample Point Description, Sampling and Type and Frequency Pathway Distance and Direction Collection Frequency Of Analyses
~
Waterborne Surface Water 1 sample upstream. -
MRUP (Sector R, Radius 1.8 Miles) At least 4500 92 days Gamma isotopic and tritium ft upstream of the GGNS discharge point into the analyses; 92 days Mississippi River to allow adequate mixing of the Mississippi and Big Black Rivers.
1 sample downstream. MRDOWN (Sector N, Radius 1.6 Miles) At least-5000 ft downstream of the GGNS discharge point into the Mississippi River near Radial Well No. 1.
1 sample downstream during a Liquid MRDOWN (Sector P, Radius 1.3 Miles) - 366 days Gamma isotopic and tritium Radwaste Discharge. Downstream of the GGNS discharge point into the analyses; 366 days Mississippi River near Radial Well No. 5.
1 sample from Outfall 007 OUTFALL 007 (Sector N, Radius 0.2 Miles) - Storm 31 days Tritium; 31 days Drain System 17
Table 1.1 Radiological Environmental Sampling Program Exposure Requirement Sample Point Description, Sampling and Type and Frequency Pathway Distance and Direction Collection Frequency Of Analyses Waterborne Groundwater Samples from 2 sources. PGWELL (Sector G, Radius 5.0 Miles) - 366 days Gamma isotopic and tritium Port Gibson Wells - Take from distribution analyses; 366 days system or one of the five wells.
CONSTWELL (Sector Q, Radius 0.4 Miles)
- GGNS Construction Water Well - Taken from distribution system or the well.
Sediment From Shoreline 1 sample from downstream area. SEDHAM (Sector N, Radius 1.6 Miles) - 366 days Gamma isotopic; 366 days Downstream of the GGNS discharge point in the Mississippi River near Hamilton Lake outlet.
1 sample from upstream area. SEDCONT (Minimum of 100 yds) -
Upstream of the GGNS discharge point in the Mississippi River.
Ingestion -
Milk 1 sample from milking animals within 8 Currently, no available milking animals within 92 days when required Gamma isotopic and 1-131; 92 km if milk is available commercially. 8 km of GGNS.
days 1 control sample (only if indicator ALCONT (Sector K, Radius 10.5 Miles) -
exists) >8 km if milk is available. Located South-southwest of GGNS at Alcorn State University.
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Table 1.1 Radiological Environmental Sampling Program Requirernent Sample PoirDescrGtion, Sampling and Type and Frequency Pathway Distance and Direction Collection Frequency Of Analyses
~~
Ingestion Fish 1 sample in vicinity of GGNS FISHDOWN - Downstream of the GGNS 366 days Gamma isotopic on edible discharge point. discharge point into the Mississippi River portion: 366 days 1 sample uninfluenced by GGNS FISHUP - Upstream of the GGNS discharge discharge. point in the Mississippi River uninfluenced by plant operations.
Food Products 1 sample of broadleaf vegetation V E G J (Sector J, Radius 0.4 Miles) - South 92 days when available Gamma isotopic and 1-131; 92 grown in one of two different offsite of GGNS near former Training Center on days locations with highest anticipated Bald Hill Road.
I annual average ground level D/Q if milk sampling is not performed.
1 sample of similar vegetation grown VEG-CONT (Sector K, Radius 10.5 Miles) -
15 - 30 km distant if milk sampling is Alcorn State University south-southwest of not performed. GGNS when available, otherwise a location 15-30 km distant.
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FIGURE 1-1 Exposure Pathways 20
FIGURE 1-2 SAMPLE COLLECTION SITES - NEAR FIELD 21
FIGURE 1-3 SAMPLE COLLECTION SITES - FAR FIELD 22
2.0 Interpretation and Trends of Results 2.1 Air Particulate and Radioiodine Sample Results GGNS did not detect any plant related gamma emitting radionuclides in the quarterly air particulate composites or Iodine- 131 in the radioiodine cartridges during the reporting period, as has been the case in previous years. The REMP detected radioactivity in this pathway attributable to other sources twice. These include the 25th Chinese nuclear test explosion in 1980, and the radioactive plume release due to reactor core degradation at Chernobyl Nuclear Power Plant in 1986. Therefore, the airborne exposure pathway has been unaffected by the operation of GGNS and airborne concentrations continue to be at background levels.
Table 3.1, which includes gross beta concentrations, provides a comparison of the indicator and control means and ranges, further emphasizes that the airborne pathway continues to remain at background levels. In the absence of plant-related gamma radionuclides, gross beta activity is attributed to naturally occurring radionuclides.
Consistent trends are present for control and indicator locations. This further supports the presence of naturally occurring activity.
2.2 Thermoluminescent Dosimetry Sample Results GGNS calculates dose by subtracting shield readings from control and indicator location readings and reports measured dose as net exposure normalized to 92 days.
GGNS relies on comparison of the indicator locations to the control location as a measure of plant impact. Gamma radiation dose in the reporting period is compared to control location readings for previous years as shown in Figure 2-1.
GGNS comparison of the indicator results to the control and to previous indicator results, as seen in Figure 2-1 and Table 3.1, indicates that plant operations had no significant impact on ambient radiation levels during the reporting period.
Six special TLD locations [S-2 through S-71 were included in this monitoring period.
This additional monitoring serves to characterize the effect of hydrogen injection, described hrther in the following paragraph.
1 TLD ILocation I I S-2 I Sector F, 0.5 mi I s-3 Sector B, 0.7 mi.
s-4 Sector D. 0.8 mi.
s-5 Sector H, 0.5 mi.
S-6 Sector K. 0.4 mi.
I s-7 1 Sector C, 0.6 mi.
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Hydrogen injection into the feedwater system provides protection against Intergranular Stress Corrosion of plant components.
With the exception of TLD locations M-21 (Sector J, 0.4 miles) and S-6 (Sector K, 0.4 miles), direct radiation levels continue to remain at or near background. The dose rate at these two locations is caused by increased Nitrogen- 16 levels associated with hydrogen injection as discussed above. Dose rates for locations M-21 [3.8 millirem per quarter]
and S-6 [3.8 millirem per quarter] above Control location M-14 (sector B, 18.0 miles) remain well below the limitations of 10 CFR 20.1301(a)(l) and 10CFR 20.1302(b)(2)(ii).
Figure 2-1 mWqtr 2001-2006 TLD Readings 20.0 16.0 R
A x
X 2001-2005 Control Location 12.0 Maxirmrn
(+2 Stdev) 2001-2005 8.0 Control Location 0
Minirmm
(-2 Stdev) 4.0
+ Qtr 1,2006 0 Qtr 2, 2006 A Qtr 3, 2006 x Qtr 4, 2006 0.0 I 24
2.3 Water Sample Results Surface water samples were collected from three indicator and one control location and analyzed for ganma emitting radionuclides and tritium. Plant related gamma emitting radionuclides and tritium remained undetectable in the upstream and downstream Mississippi River locations, which is consistent with preoperational and previous operational years. Storm waters contribute to Outfall 007 and can include tritium as a result of washout and entrainment of routine, previously monitored gaseous effluents.
As a result, tritium levels below the minimum detection level requirement are occasionally observed. Tritium was detected at an average concentration of 678 k 260 pCi/L in the Outfall 007 (indicator) location.
In addition to the tritium samples required by the REMP, five special surface water samples for gamma were collected at the Outfall 007 location. Plant related gamma emitting radionuclides remained undetectable in these samples.
Based on review of results and historical data, GGNS concluded that plant operations had no significant impact on this pathway during the reporting period.
Groundwater samples were collected from two locations (indicator and control) and analyzed for gamma emitting radionuclides and tritium. GGNS did not detect any plant related gamma emitting radionuclides or tritium in groundwater samples during the reporting period.
Based on review of results and historical data, GGNS concluded that plant operations had no significant impact on this pathway during the reporting period.
2.4 Sediment Sample Results Sediment samples were collected from two ODCM Specification locations (indicator and control) and analyzed for gamma emitting radionuclides. In this reporting period, plant related gamma emitting radionuclides were below detectable concentrations in the upstream (control) location. Cesium-137 was detected at an average concentration of 43.3 k 14 pCi/kg in the downstream (indicator) location.
A review of REMP data collected at the downstream location from 1983 through 2005 indicates the Cesium-137 concentration has ranged from less than detectable to 300 pCi/Kg. Cesium-137 has previously been detected in the upstream (control) location.
The presence of Cesium- 137 is attributed to atmospheric weapons testing.
Based on review of results and historical data, GGNS concluded that plant operations had no significant impact on this pathway during the reporting period.
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2.5 Milk Sample Results GGNS personnel did not collect milk samples within five miles of the site in the reporting period due to the absence of milking animals. Since there are no dairies within five miles of GGNS, it is concluded GGNS operation had no impact on this pathway.
2.6 Fish Sample Results Fish samples were collected from two locations (indicator and control) and analyzed for gamma emitting radionuclides. GGNS did not detect any plant related gamma emitting radionuclides in fish samples during the reporting period, as has been the case in preoperational and previous operational years. These results indicate that this pathway has not been affected by plant operations.
2.7 Food Product Sample Results Food product samples were collected from control and indicator locations when available and analyzed for gamma emitting radionuclides. GGNS did not detect any plant related gamma emitting radionuclides in vegetation samples during the reporting period. Nuclides detected previously at the control and indicator locations are attributed to the Chernobyl release and atmospheric weapons testing. These results indicate that this pathway has not been affected by plant operations.
One sample of vegetation was collected at an onsite location to supplement the REMP.
GGNS did not detect any plant related gamma emitting radionuclides in this vegetation sample during the reporting period.
One sample of venison was collected on the GGNS property to supplement the REMP.
GGNS did not detect any plant related gamma emitting radionuclides in this venison sample during the reporting period.
26
2.8 Land Use Census Results The most recent Land Use Census was performed from April 10-12,2006. Methods utilized include: visual surveys, door to door surveys, telephone interviews, GPS, Aerial Photography, and consultation with the local county agent concerning dairy production in Claiborne County.
During the survey the following questions were asked:
Name of occupant Address Number of people residing at residence Age group of occupants Any farm animal raised for human consumption Any dairy production Maintain a garden Changes from the previous Land Use Census were evaluated in accordance with GGNS surveillance 06-EN-S000-0-0002 sections 5.1.3.b(2) and 5.2. The differences were compared to the locations and assumptions used in calculations for compliance with the Offsite Dose Calculation Manual (ODCM), LCO 6.1 1.6. It was determined that the locations and assumptions currently used in ODCM are more conservative than any of the changes. Other determinations from the previous Land Use Census results are:
0 The child age group with the highest dose commitment is in Sector A (North) at 1.78 miles, GGNS ODCM calculations currently uses the maximum calculated dose from either Sector L (Southwest) at 0.89 miles or Sector C (Northeast) at 0.67 miles. Doses calculated at Sector A would be lower.
0 One location recorded as occupied in the previous land use census is now unoccupied, sector E (East) at 0.83 miles.
0 Because of downwind location and/or distance from the site, in no case will the occupancy of an existing unoccupied residence cause any ODCM critical receptor calculation results to be less conservative.
0 No additional sampling locations are required as the onsite gardenhegetation sampling location (Sector J, 0.4 miles) is more conservative than changes identified in the land use census.
0 Cattle are raised for human consumption (most notably Sector H, J, and K). GGNS uses the Grass/Cow/Meat pathway.
27
0 The milk pathway does not need to be activated, no commercial dairy production is occurring within 5 miles. Resident in Sector F occasionally milks cows for consumption if the cow is producing too much milk for the calf. This is not commercial dairy production as referenced by ODCM Table 6.12.1- 1; therefore, the milk pathway does not need to be activated.
0 Sectors M, N, P, and Q are remote areas in which the primary use is hunting. Area was surveyed by vehicle and aerial photographs. Also, all areas in Louisiana within 5 miles belong to the Winter Quarters exclusive hunting club. From the previous census, personnel at entrance gate were interviewed and responded, No permanent residence or gardens, the area is posted.
0 Gardens, regardless of size, were included in the census data.
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Parameter Sector A
- Sector B Sector C Sector D
[.Nearest Occupied a. Distance (mile) 0.98 0.83 0.67 2.57 Residence b. Number of Occupants 2 2 2 6
- c. Degrees from true north 354.0 15.1 42.1 60.5
[I. Nearest Unoccupied a. Distance (mile) 0.94 None None None Residence (closer than occupied residence) 111. Nearest Milk Animal a. Distance None None None None IV. Nearest Broadleaf a. Distance (mile) 1.78 1.52 0.67 2.86 Garden b. Garden size (ft2) = 1200 = 4050 o 1250 = 500
- c. Degrees from true north 352.2 21.9 42.1 59.7 V. Census Comparison a. Is nearest occupied residence in same location as last census? Yes Yes Yes Yes
- c. Is nearest broadleaf garden in same location as last census? No Yes Yes Yes 29
Table 2.1 Land Use Census Results Parameter Sector E
- I sector^* I Sector G I SectorH I. Nearest Occupied a. Distance (mile) 0.89 2.25 2.10 1.11 Residence b. Number of Occupants 3 2 3 6
- c. Degrees from true north 86.9 101.5 129.7 152.5
- 11. Nearest Unoccupied a. Distance (mile) 0.83 None 1.93 1.08 Residence (closer than occutied residence) 111. Nearest Milk Animal a. Distance None None None None IV. Nearest Broadleaf a. Distance (mile) 0.89 4.05 3.81 1.11 Garden b. Garden size (ft2) =loo0 =50 . s1600 = 500
- c. Degrees from true north 86.9 114.3 129.1 152.5 V. Census Comparison a. Is nearest occupied residence in same location as last census? No Yes
- c. Is nearest broadleaf garden in same location as last census? Yes No
- Change from last census, see attached table of Land Use Census Changes 30
s Table 2.1 Land Use Census Results Parameter Sector J Sector K
- Sector L* I Sector M I. Nearest Occupied a. Distance (mile) 3.16 2.23 0.89 None Residence b. Number of Occupants 2 1 2
- c. Degrees fiom true north 174.3 196.9 219.7
- 11. Nearest a. Distance (mile) None None None None UnoccupiedResidence (closer than occupied
~
residence) 111. Nearest Milk Animal a. Distance None None None None IV. Nearest Broadleaf a. Distance (mile) 3.16 2.23 0.89 None Garden b. Garden size (ft2) = 500 = 2500 = 300
- c. Degrees from true north 174.3 196.9 219.7 V. Census Comparison a. Is nearest occupied residence in same location as last census? Yes Yes Yes N!A
- c. Is nearest broadleaf garden in same location as last census? Yes Yes Yes NIA 31
Table 2.1 Land Use Census Results Par meter Sector N Sector P Sector Q Sector R
- 1. Nearest Occupied a. Distance (mile) None None None 1.11 Residence b. Number of Occupants 2
- c. Degrees from true north 346.1
[I. Nearest a. Distance (mile) 1.61 4.83 3.5 None UnoccupiedResidence (closer than occupied residence) 111. Nearest Milk Animal IV. Nearest Broadleaf
- a. Distance
- a. Distance (mile)
I None None I None None None None I None 1.46 Garden b. Garden size (ft2) x. 4000
- c. Degrees from true north 342.9 V. Census Comparison a. Is nearest occupied residence in same location as last census? NIA NIA NIA Yes
- Change from last census, see attached table of Land Use Census Changes 32
Land Use Census Changes SECTOR PARAMETER Reason for Change A Nearest Occupied Name Change Residence A Nearest Garden New nearest garden E
1 Nearest Occupied Residence I Moved out from 0.83 miles to 0.89 miles E Unoccupied Residence House unoccupied E Garden Size More accurate size, now two =500 ft2 gardens F Nearest Garden New nearest garden K Garden Size More accurate size L Garden Size More accurate size 33
2.9 Interlaboratory Comparison Results River Bend Station (RI3S) Environmental Laboratory analyzed interlaboratory comparison samples to fulfill the requirements of the ODCM Specifications 6.12.1. , Radiological Environmental Monitoring Report, contains these results in Table 9.1. GGNS review of RBS interlaboratory comparison indicated that 98%
of results were within control limits for accuracy, and 100% of results were within control limits for precision.
34
3.0 Radiological Environmental Monitoring Program Summary 3.1 Program Results Summary Table 3.1 summarizes the REMP results. GGNS personnel did not use values reported as less than the lower limit of detection (<LLD) when determining ranges and means for indicator and control locations.
35
TABLE 3.1 Radiological Environmental Monitoring Program Summary Name of Facility: Grand Gulf Nuclear Station Docket No: 50-416 Location of Facility: Claiborne Countv, Mississipr>i Reporting Period: January - December 2006 Type & Number LLD Indicator Locations Location with Highest Annual Mean Control Locations Number of of Analyses a Mean ( F ) Mean ( F ) Nonroutine
[ Range I [ Range 1 Results Mean ( F )
Location d [ Range ]
GB 156 0.01 0.027 ( 104 I 104 ) AS-1 PG 0.027 ( 52 152 ) 0.026 ( 52 152 )
[ 0.013 - 0.048 3 (Sector G, 5.5 mi ) [ 0.015 - 0.048 ] [ 0.013 - 0.042 ]
GS 12 (3-134 0.05 <LLD NIA NIA <LLD (3-137 0.06 <LLD NIA NIA <LLD 1-131 156 0.07 <LLD NIA NIA <LLD 0 Gamma 36 9.4 ( 36 I 36 ) M-2 1 13.5 ( 4 1 4 ) NIA
[ 6.8 - 14.3 ] (Sector J, 0.4 mi. ) [ 12.6 - 14.3 ]
Gamma 27 9.1 ( 2 7 1 2 7 ) M-57 10.7 ( 4 14 ) NIA
[ 6.2 - 11.6 ] (Sector F, 4.5 mi.) [ 9.6- 11.61 Gamma 28 8.6 ( 28 1 28 ) M-0 1 10.2(4/4) NIA
[6.7-11.31 (Sector E, 3.5 mi. ) [ 9.5 - 11.3 ]
Gamma 4 NIA NIA NIA 9.7 ( 4 i 4 )
[ 8.9 - 10.7 ]
36
TABLE 3.1 Radiological Environmental Monitoring Proeram Summary Name of Facility: Grand Gulf Nuclear Station Docket No: 50-416 Location of Facility: Claiborne Countv, Mississippi Reporting Period: January - December 2006 Sample Type Type 8z Number LLD Indicator Location Location with Highest Annual Mean Control Locations Number of
( Units ) of Analyses a Mean ( F ) Mean ( F ) Nonroutine
[ Range 1 Range 1 Results Mean(F)C Location d [ Range 1 ~
Surface Water H-3 24 3000 678 ( 5 I 19 ) Outfall 007 678 ( 5 113 ) <LLD 0
( PCU 1 [ 354 - 1220 3 ( Sector N, Radius 0.2 mi.) [ 354 - 1220 ]
GS 10 1-131 15 <LLD NIA NIA <LLD 0 Mn-54 15 <LLD NIA NIA <LLD 0 Fe-59 30 <LLD NIA NIA <LLD 0 co-58 15 <LLD NIA NIA <LLD 0 CO-60 15 <LLD NIA NIA <LLD 0 Zn-65 30 <LLD NIA NIA <LLD 0 Zr-95 30 <LLD NIA NIA <LLD 0 Nb-95 15 <LLD NIA NIA <LLD 0 (3-134 15 <LLD NIA NIA <LLD 0 (3-137 18 <LLD NIA NIA <LLD 0 Ba-140 60 <LLD NIA NIA <LLD 0 La- 140 15 <LLD NIA NIA <LLD 0 37
TABLE 3.1 RadioloPical Environmental MonitorinP Program Summary Name of Facility: Grand Gulf Nuclear Station Docket No: 50-416 Location of Facility: Claiborne County, Mississippi Reporting Period: January - December 2006 Type & Number LLD Indicator Locations Location with Highest Annual Mean Control Locations Number of of Analyses a Mean ( F ) Mean ( F ) Nonroutine 1 Range I I Range 1 Results Mean ( F )
Location d [ Range ]
H-3 2 2000 <LLD NIA NIA <LLD 0 1-131 2 1 <LLD NIA NIA <LLD 0 GS 4 Mn-54 15 <LLD NIA NIA <LLD 0 Fe-59 30 <LLD NIA NIA <LLD 0 CO-58 15 <LLD NIA NIA <LLD 0 CO-60 15 <LLD NIA NIA <LLD 0 Zn-65 30 <LLD NIA NIA <LLD 0 Zr-95 30 <LLD NIA NIA <LLD 0 Nb-95 15 <LLD NIA NIA <LLD 0 CS-134 15 <LLD NIA NIA <LLD 0 (3-137 18 <LLD NIA NIA <LLD 0 Ba- 140 60 <LLD NIA NIA <LLD 0 La- 140 15 <LLD NIA NIA <LLD 0 GS 4 (3-134 150 <LLD NIA NIA <LLD 0 (3-137 180 43.32 (2I2) SEDHAM 43.32 (212) <LLD 0
[ 35.99- 50.64 ] (Sector N, 1.6 mi. ) [ 35.99- 50.64 ]
38
TABLE 3.1 Radioloeical Environmental Monitoring Provram Summary Name of Facility: Grand Gulf Nuclear Station Docket No: 50-416 Location of Facility: Claiborne County, Mississimi Reporting Period: Januarv - December 2006 Indicator Location Location with Highest Annual Mean Control Locations Number of Mean ( F ) Mean ( F ) Nonroutine
[ Range 1 [ Range 1 Results Mean ( F )
Location d [ Range ]
<LLD NiA NIA <LLD
<LLD NIA ~ NiA <LLD
<LLD NiA N/A <LLD 0 9.4 ( 24 i 24 ) S-6 13.5 ( 4 I 4 ) 9.7(414) 0
[ 5.5 - 14.2 1 ( Sector K, 0.4mi. ) [ 12.5 - 14.2 ] [ 8.9 - 10.7 ]
<LLD N/A NIA <LLD 0
<LLD NiA NIA <LLD 0 39
TABLE 3.1 Radiological Environmental Monitorine Program Summarv Name of Facility: Grand Gulf Nuclear Station Docket No: 50-416 Location of Facility: Claiborne County, Mississiwi Reporting Period:
Sample Type Type & Number LLD Indicator Location Location with Highest Annual Mean Control Locations Number of
( Units ) of Analyses a Mean ( F ) Mean ( F ) Nonroutine 1 Range I [ Range I Results Mean ( F )
Location d [ Range ]
Venison GS 1 (Special) Mn-54 130 <LLD NIA NIA NIA (P c m 1 Fe-59 260 <LLD NIA NIA NIA CO-58 130 <LLD NIA NIA NIA CO-60 130 <LLD NIA NIA NIA Zn-65 260 <LLD . NIA NIA NIA CS-134 130 <LLD NIA NIA NIA (3-137 150 <LLD NIA NIA NIA Surface Water GS 5 (Special) 1-13 1 15 <LLD NIA NIA <LLD 0 (PC81 Mn-54 15 <LLD NIA NIA <LLD 0 Fe-59 30 <LLD NIA NIA <LLD 0 Co-58 15 <LLD NIA NIA <LLD 0 CO-60 15 <LLD NIA NIA <LLD 0 Zn-65 30 <LLD NIA NIA <LLD 0 Zr-95 30 <LLD NIA NIA <LLD 0 Nb-95 15 <LLD NIA NIA <LLD 0 CS-134 15 <LLD NIA NIA <LLD 0 3-137 18 <LLD NIA NIA <LLD 0 Ba- 140 60 <LLD NIA NIA <LLD 0 La- 140 15 NIA NIA 0 a GB = Gross beta; 1-131 = Iodine-131; H-3 = Tritium; GS = Gamma scan.
LLD = Required lower limit of detection based on GGNS ODCM Table 6.12.1-3.
Mean and range based upon detectable measurements only. Fraction of detectable measurements at specified locations is indicated in parenthesis (F).
Where applicable, locations are specified by name, distance from reactor site and meteorological sector.
Non-routine results are those which exceed ten times the control station value. If no control station value is available, the result is considered non-routine if it exceeds ten times the preoperational value for the location.
LLD is not defined in GGNS ODCM Table 6.12.1-3.
40
Attachment 1 Radiological Monitoring Report Summary of Monitoring Results 41
TABLE OF CONTENTS TABLE 1.1 AIR PARTICULATE FILTER GROSS BETA AND 43 CHARCOAL CARTRIDGE IODINE-I31 TABLE 1.2 AIR PARTICULATE FILTER GAMMA 52 TABLE 2.1 THERMOLUMINESCENT DOSIMETERS 53 TABLE 2.2 THERMOLUMINESCENT DOSIMETERS 54 TABLE 2.3 THERMOLUMINESCENT DOSIMETERS 55 TABLE 2.4 THERMOLUMINESCENT DOSIMETERS 55 TABLE 3.1 SURFACE WATER GAMMA 56 TABLE 3.2 SURFACE WATER TRITIUM 57 TABLE 4.1 GROUNDWATER GAMMA 58 TABLE 4.2 GROUNDWATER TRITIUM 59 TABLE 4.3 GROUNDWATER IODINE-I31 60 TABLE 5.1 SEDIMENT 61 TABLE 6.1 FISH 62 TABLE 7.1 FOOD PRODUCTS 63 TABLE 8.1 SPECIAL SAMPLES 64 TABLE 9.1 INTERLABORATORY COMPARISON 65 42
Table 1.I Saniplc 'Type: Air Particulate Filter and Kadioiodine Cartridw Analysis: Gross Beta and 1-13 1 IJnits: pCi/m' AIR SAMPLE AS-1 PG G G M Nearest Community LLI) (pCilm"3) AS-1 0.07 0.01 LAB ID S'IAKI' ilA'YE EKI) DA'I'E 1-131 GROSS BETA 20060008 12/27/2005 1/3/2006 < 0.020 0.035 +I -
0.003 20060026 1/3/2006 111012006 < 0.018 0.028 +I- 0.002 20060058 1/ 10/2006 111712006 < 0.016 0.024 +/- 0.002 20060085 111712006 1/24/2006 < 0.015 0.028 +I- 0.003 20060121 1/24/2006 1/31/2006 < 0.015 0.024 +I- 0.002 20060156 113 112006 21712006 < 0.018 0.019 +/- 0.002 20060198 2/7/2006 211412006 < 0.022 0.022 +/- 0.002 200602 18 2/1412006 212112006 < 0.018 0.021 +/- 0.002 20060244 212 1I2006 2/28/2006 < 0.018 0.025 +J- 0.002 20060269 2/28/2006 3/7/2006 < 0.018 0.033 +I- 0.003 20060294 3/7/2006 3/14/2006 < 0.014 0.026 +i- 0.003 200603 16 311412006 3/21/2006 < 0.020 0.024 +i- 0.002 20060348 3/21/2006 312812006 < 0.017 0.017 +I- 0.002 20060387 3/28/2006 4/4/2006 < 0.016 0.023 +/- 0.002 20060436 4/4/2006 4l1112006 < 0.012 0.029 +i- 0.003 20060462 411 112006 411812006 < 0.019 0.026 +I -
0.002 20060494 411812006 412512006 < 0.019 0.026 +/- 0.003 20060527 412512006 51212006 < 0.019 0.026 +I- 0.002 20060549 5/2/2006 5/912006 < 0.017 0.022 +I- 0.002 20060564 5/9/2006 5/16/2006 < 0.015 0.020 +I- 0.002 43
LLD (pCi/mA3) AS-1 PG 0.07 0.01 LAB ID START DATE END DATE 1-131 GROSS BETA 20060584 511 612006 512312006 < 0.014 0.026 +I- 0.002 20060594 512312006 513012006 < 0.01s 0.024 +/- 0.002 20060618 513012006 61612006 < 0.017 0.027 +I- 0.003 20060653 61612006 611312006 < 0.014 0.038 +I- 0.003 20060684 611312006 61201200 6 < 0.020 0.030 +/- 0.003 20060705 612012006 612712006 < 0.016 0.026 +I- 0.002 20060742 612712006 71412006 < 0.015 0.030 +/- 0.003 2006077 1 71412006 711 1I2006 < 0.024 0.018 +l- 0.002 20060795 711 112006 711812006 < 0.019 0.025 +I- 0.002 20060827 711812006 712512006 < 0.014 0.025 +/- 0.002 20060 8 54 712512006 81112006 < 0.016 0.015 +I- 0.002 20060863 81112006 8/7/2006 < 0.018 0.031 +I- 0.003 20060898 81712006 811412006 < 0.017 0.015 +/- 0.002 20060914 8A412006 812212006 < 0.018 0.035 +I- 0.003 20060943 8!22/2006 812 912006 < 0.015 0.019 +I- 0.002 20060950 812912006 91512006 < 0.015 0.028 +I- 0.002 20060976 91512006 911212006 < 0.017 0.041 +/- 0.003 20061 009 911212006 911912006 < 0.022 0.024 +I- 0.002 20061032 911912006 912612006 < 0.015 0.024 +I- 0.002 20061062 912612006 1013l2006 < 0.018 0.038 +I- 0.003 20061 115 10l3l2006 1011012006 < 0.019 0.048 +/- 0.003 20061 136 1011012006 1011712006 < 0.020 0.034 +I- 0.003 2
44
LLD (pCilm"3) AS-1 PG 0.07 0.01 LAB ID START DATE END DATE 1-131 GROSS BETA 2006 1176 1O i l 712006 10/24/2006 < 0.023 0.023 +/- 0.002 2006 1205 1012412006 10/31/2006 < 0.015 0.032 +I -
0.003 20061232 1013112006 111712006 < 0.017 0.027 +I- 0.003 2006 1244 11/7/2006 1111412006 < 0.020 0.025 +I- 0.002 2006 1262 11114/2006 1112112006 < 0.017 0.036 +/- 0.003 20061298 11/2112006 11/28/2006 < 0.016 0.034 +I -
0.003 2006 1327 1112812006 12/4/2006 < 0.029 0.024 +I- 0.003 20061345 12/4/2006 1211212006 < 0.019 0.03 1 +I- 0.0011 20061378 1211212006 1211912006 < 0.021 0.029 +I- 0.0011 20061410 1211912006 12/27/2006 < 0.013 0.027 +I- 0.0010 Average: 0.027 Maximum 0.048 Minimum: 0.0 15 45
Table 1.1 Sample 'Pypc: Air Particulate Filter and Radioiodine Cartridge Analysis: Cross Beta and 1-13 1 Units: pC:i/m' AIR SAMPLE AS-3 61VA - GGNS - Control l,l,ll (pCUm3) 0.07 0.01 1,AR 11) STAR"1'DA'I'E END DA'I'E 1-1 3 1 GROSS HE'I'A 20060009 1212712005 11312006 < 0.018 0.032 +I- 0.003 20060027 1I312006 1I1 012006 < 0.020 0.028 +I- 0.002 20060059 111012006 111712006 < 0.019 0.020 +I- 0.002 20060086 111712006 112412006 < 0.014 0.028 +I- 0.003 20060122 112412006 113112006 < 0.017 0.021 +I- 0.002 200601 57 113112006 2/7/2006 < 0.015 0.018 +I- 0.002 20060 199 2/7/2006 211412006 < 0.010 0.023 +I- 0.002 200602 19 211412006 212 112006 < 0.017 0.022 +I- 0.002 20060245 212112006 212812006 < 0.016 0.024 +I- 0.002 20060270 2/28/2006 31712006 < 0.017 0.031 +I- 0.003 20060295 31712006 3/14/2006 < 0.019 0.027 +I- 0.003 200603 17 311412006 312 112006 < 0.015 0.025 +I- 0.002 20060349 312112006 312812006 < 0.017 0.015 +I- 0.002 20060388 312812006 41412006 < 0.015 0.021 +I- 0.002 20060437 41412006 411 112006 < 0.021 0.025 +I- 0.002 20060463 411 112006 4; 1812006 < 0.017 0.022 +I- 0.002 20060495 411 812006 412512006 < 0.018 0.022 +I- 0.002 20060528 412512006 51212006 < 0.019 0.024 +I- 0.002 20060550 51212006 51912006 < 0.017 0.023 +I- 0.002 20060565 51912006 511612006 < 0.020 0.017 +I- 0.002 46
LLD (pCi/mA3) AS-3 0.07 0.01 LAB ID START DATE END DATE 1-131 GROSS BETA 20060585 511612006 5123 12006 < 0.017 0.023 +I- 0.002 20060595 512312006 513012006 < 0.018 0.021 +I- 0.002 20060619 513012006 6/6/2006 < 0.016 0.027 +I- 0.003 20060654 61612006 611312006 < 0.020 0.033 +/- 0.003 20060685 611312006 61201200 6 < 0.018 0.026 +/- 0.002 20060706 612012006 612712006 < 0.016 0.024 +I- 0.002 20060743 612712006 7/4/2006 < 0.022 0.029 +1- 0.003 20060772 7/4/2006 711 112006 < 0.026 0.017 +I- 0.002 20060796 711 112006 711812006 < 0.017 0.027 +I- 0.003 20060828 711812006 712512006 < 0.019 0.025 +I- 0.003 20060855 7/25/2006 81112006 < 0.014 0.016 +I- 0.002 20060864 81112006 8/7/2006 < 0.020 0.030 +/- 0.003 20060899 81712006 8/14/2006 < 0.016 0.013 +/- 0.002 200609 15 811412006 812212006 < 0.017 0.028 +I- 0.002 20060944 8i2212006 812912006 < 0.016 0.018 +/- 0.002 2006095 1 8/29/2006 9/5/2006 < 0.015 0.025 +I- 0.002 20060977 91512006 9/1212006 < 0.017 0.035 +I- 0.003 200610 10 911212006 911912006 < 0.027 0.023 +I- 0.002 20061033 9i1912006 9/26/200 6 < 0.019 0.023 +/- 0.002 20061063 912612006 101312006 < 0.018 0.033 +I- 0.003 20061 116 101312006 1011Oi2006 < 0.019 0.041 +I- 0.003 20061 137 1Oil 012006 1011712006 < 0.015 0.033 +I- 0.003 2
47
LLD (pCilm"3) AS-3 0.07 0.01 LAB ID START DATE END DATE 1-131 GROSS BETA 2006 1177 10117i2006 1012412006 < 0.020 0.023 +I- 0.002 2006 1206 1012412006 10131/2006 < 0.014 0.033 +I- 0.003 20061233 1013112006 11/7/2006 < 0.015 0.026 +/ 0.003 20061245 111712006 1111412006 < 0.018 0.027 +/- 0.002 20061263 11/14/2006 11/21/2006 < 0.017 0.042 4-0.003 2006 1299 11/21/2006 11/28/2006 < 0.016 0.029 +I- 0.003 20061328 11/28/2006 12/4/2006 < 0.026 0.024 +I- 0.003 20061346 12/4/2006 12/12/2006 < 0.019 0,031 +i- 0.0011 20061379 1211212006 12/19/2006 < 0.015 0.028 +I- 0.001 1 20061411 1211912006 12/27/2006 < 0.018 0.029 +I- 0.0010 Average: 0.026 Maximum 0.042 Minimum: 0.013 48
Table 1.1 Sample Type: Air Particulate Filter and Radioiodine Cartridge Analysis: Gross Beta and 1-131 Units: pCi/m AIR SAMPLE AS GGNS - lndieator I L D (pCiim3) AS-7tTH 0.07 0.01 LAB 11) STAKI DATE END DATE 1-131 GROSS BETA 200600 10 12/27/2005 11312006 < 0.018 0.031 +I- 0.003 20060028 11312006 111Of2006 < 0.018 0.028 +/- 0.002 20060060 111012006 111712006 < 0.013 0.023 +I- 0.002 20060087 ll17l2006 112412006 < 0.013 0.027 +I- 0.003 20060123 112412006 113112006 < 0.015 0.020 +I- 0.002 200601 5 8 113112006 21712006 < 0.015 0.019 +i- 0.002 20060200 21712006 211412006 < 0.013 0.022 +/- 0.002 20060220 211412006 212112006 4 0.016 0.022 +I- 0.002 20060246 212112006 212812006 < 0.018 0.025 +I- 0.002 20060271 212812006 31712006 < 0.019 0.034 +I- 0.003 20060296 31712006 311412006 < 0.016 0.027 +1- 0.003 200603 18 31 1412006 312 112006 < 0.019 0.026 +I- 0.002 20060350 312112006 312812006 < 0.017 0.018 +I- 0.002 20060389 312812006 414,2006 < 0.014 0.022 +I- 0.002 20060438 41412006 411 112006 < 0.016 0.028 +I- 0.003 20060464 41 112006 4i1812006 .c 0.015 0.023 +I- 0.002 20060496 41 18!2006 4l2512006 < 0.016 0.024 +i- 0.003 20060529 412512006 51212006 < 0.012 0.025 +I- 0.002 1
49
LLD (pCilm"3) AS-7UH 0.07 0.01 LAB ID START DATE END DATE 1-131 GROSS BETA 2006055 1 51212006 51912006 < 0.012 0.019 +I- 0.002 20060566 51912006 5l1612006 < 0.018 0.018 +/- 0.002 20060586 511612006 512312006 < 0.015 0.024 +I- 0.002 20060596 512312006 5/29/2006 < 0.019 0.021 +I- 0.003 20060620 512912006 61612006 < 0.018 0.025 +I- 0.002 20060655 61612006 611312006 < 0.017 0.037 +I- 0.003 20060686 611312006 612012006 < 0.015 0.028 +I- 0.003 20060707 612012006 612712006 < 0.015 0.023 +I- 0.002 20060744 612712006 71412006 < 0.026 0.030 +I'- 0.003 20060773 7141200 6 711 112006 < 0.021 0.017 +I- 0.002 20060797 7il112006 711812006 < 0.016 0.023 +I- 0.002 20060829 711812006 712512006 < 0.016 0.022 +I- 0.002 20060856 712512006 8/1/2006 < 0.014 0.013 +I- 0.002 20060865 81112006 8l712006 < 0.017 0.027 +I- 0.003 20060900 81712006 8/14/2006 < 0.019 0.014 +I- 0.002 200609 16 811412006 8/22/2006 < 0.013 0.030 +I- 0.002 20060945 812212006 812912006 < 0.017 0.015 +I- 0.002 20060952 812912006 91512006 < 0.017 0.026 +I- 0.002 20060978 9/5/2006 911212006 < 0.018 0.039 +I- 0.003 2006101 1 911212006 911912006 < 0.024 0.024 +I- 0.002 2006 1034 911912006 912612006 < 0.019 0.021 +I- 0.002 20061 064 912612006 10l312006 < 0.018 0.038 +/- 0.003 20061 117 101312006 1011012006 < 0.017 0.044 +I- 0.003 20061 138 1O i l 0/2006 1O i l 712006 < 0.013 0.032 +I- 0.003 50
LLD (pCi/mA3) AS-7UH 0.07 0.01 LAB ID START DATE END DATE 1-131 GROSS BETA 20061178 1011712006 1012412006 < 0.018 0.021 +I- 0.002 20061207 10124/2006 10/31/2006 < 0.019 0.035 +/- 0.003 20061234 10/31/2006 11/7/2006 < 0.017 0.024 +l- 0.003 20061246 11/7/2006 11/14/2006 < 0.014 0.029 +/- 0.002 20061264 11/14/2006 11/21/2006 < 0.017 0.039 +/- 0.003 2006 1300 11/21/2006 11/28/2006 < 0.019 0.032 +/- 0.002 2006 1329 11/28/2006 12/4/2006 < 0.023 0.023 +I- 0.003 2006 1347 12/4/2006 12/12/2006 < 0.018 0.033 +/- 0.0011 20061380 1211212006 1211912006 < 0.022 0.028 +/-'0.0011 200614 12 1211912006 12/27/2006 < 0.014 0.027 +/- 0.0010 Average: 0.026 Maximum 0.044 Minimum: 0.0 13 51
Table 1.2 Sample 'Type: Air Particulate Filter Analysis: Gamma Isotopic Units: pciim' AIR PARTICULATE FILTER QUARTERLY COMPOSITES (GA,MMA) GGIVS -
LLD (pCilm"3) 0.05 0.06 LAB ID LOCATION DATE CS-134 CS-137 20060450 AS-1 PG 211012006 < 0.005 < 0.004 2006045 1 AS-3 61VA 211012006 < 0.004 < 0.003 20060452 AS-7 UH 211012006 < 0.003 < 0.003 20060730 AS-1 PG 511212006 < 0.004 < 0.003 2006073 1 AS-3 61VA 5/12/2006 < 0.004 < 0.004 20060732 AS-7 UH 511212006 < 0.004 < 0.003 20061091 AS-1 PG 811 112006 < 0.004 < 0.004 20061092 AS-3 61VA 811 112006 < 0.004 < 0.003 2006 1093 AS-7 UH 8/11/2006 < 0.005 < 0.003 2006141 8 AS-1 PG 1111112006 < 0.005 < 0.004 20061419 AS-3 61VA 1111112006 < 0.004 < 0.003 20061420 AS-7 UH 1111112006 < 0.003 < 0.004 52
Table 2.1 Sample lype:Thermoluminescent Dosimeters Analysis: Gamma Dose Units: mremQtr Inner Ring - Within General Area of Site Boundary (ODCM Specifications)
Station 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Mean M-16 8.6 10.8 9.5 9.5 9.6 M-17 8.7 10.2 9.8 9.4 9.5 M-19 7.9 10.0 8.7 8.8 8.8 M-21
- 12.6 14.3 13.2 14.0 13.5 M-22 7.4 9.4 8.0 9.2 8.5 M-23 6.9 8.8 7.9 7.7 7.8 hI-25 6.8 9.1 7.9 7.4 7.8 M-2 8 8.9 10.7 10.0 9.7 9.8 M-94 8.1 9.6 9.7 9.2 9.1 Outer Ring - Approximately Three (3) to Five (5) Miles from the Site (ODCM Specifications)
Station 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Mean M-36 7.5 9.5 8.0 8.4 8.4 M-40 6.2 7.2 6.6 6.6 6.7 M-48 8.1 10.4 8.3 9.7 9.1 M-49 ** 11.1 9.3 9.5 9.9 M-50 8.6 9.9 8.9 8.9 9.1 hI-55 9.4 11.0 9.9 10.1 10.1 M-5 7
- 9.6 11.4 11.6 10.2 10.7
- Location with highest annual mean.
- TLD Missing 53
Table 2.2 Sample Type: Thermoluminescent Dosimeters Analysis: Gamma Dose Units: mrem/Qtr Special Interest Areas - Population Centers & Schools (ODCM Specifications)
Station 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Mean
%I-01* 9.5 11.3 10.0 10.2 10.2 M-07 8.0 10.5 8.6 8.8 9.0 M-09 7.8 9.4 8.6 8.9 8.7 M-10 6.7 8.6 7.3 7.7 7.6 M-33 7.9 8.2 7.6 7.6 7.8 M-3 8 8.3 9.1 8.7 8.2 8.6 M-39 7.9 8.9 8.4 8.4 8.4
- Location with highest annual mean.
54
Table 2.3 Sample lypc: Thermoluminescent Dosimeters Analysis: Gamma Dose Units: inrenvQtr Special Interest Areas - Control (ODCNI Specifications)
Station 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Mean M-14 8.9 10.7 9.4 9.7 9.7 Table 2.4 Sample Type: Thermoluminescent Dosimeters Analysis: Gamma Dose Units: mredQtr Supplemental Areas Station 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Mean s-2 9.3 7.4 7.1 7.5 7.8 s-3 8.7 7.4 7.0 6.9 7.5 s-4 5.5 6.7 6.8 6.1 6.3 s-5 10.3 12.2 11.2 11.1 11.2 S-6
- 12.5 14.2 13.9 13.4 13.5 s-7 9.1 11.3 10.8 10.1 10.3
- Location with highest annual mean.
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Table 3.1 Sample Type: Siirfacc Water Analysis: Gamma Isotopic Units: pCi/l SURFACE \VATER SAMPLES (GAMMA) - GGNS LLD (pCi/l) 15 15 30 15 30 15 30 15 15 18 60 15 LAB ID LOCATION DATE MN-54 CO-58 FE-59 CO-60 ZN-65 XB-95 ZR-95 1-131 CS-134 CS-137 BA-140 LA-140 20060034 MR DOWN 1/10/2006 <10.50 < 10.54 < 15.87 < 8.19 < 18.82 < 8.42 < 21.93 < 13.03 < 12.84 < 7.51 < 47.97 < 14.26 20060035 MRUP 1/10/2006 < 9.62 < 8.30 < 22.10 < 5.23 < 15.03 < 10.64 < 15.67 < 10.57 < 8.68 c 7.32 < 30.85 < 10.27 20060432 MR DOWN 4/11/2006 < 5.38 < 9.38 < 18.49 < 9.35 < 16.99 < 9.74 < 19.59 < 14.39 4 9.91 < 9.03 < 38.67 < 10.56 20060434 MRUP 4/11/2006 < 11.52 < 13.38 < 24.72 < 13.09 < 22.44 < 10.65 < 19.22 < 12.00 < 11.42 < 13.40 < 28.69 < 14.99 20060767 MR DOWN 711 1/2006 < 8.25 < 9.80 < 23.31 < 7.66 < 21.37 < 10.80 < 12.94 < 11.11 < 10.66 < 9.20 < 31.30 4 14.29 20060779 MRUP 7/11/2006 < 8.88 < 9.51 < 9.18 < 9.47 < 21.91 < 10.73 < 13.74 < 13.97 < 9.69 < 7.02 < 36.71 < 13.09 2006 1124 MRDOWN 10/11/2006 < 5.89 < 4.96 < 12.88 < 7.52 < 29.79 < 9.65 < 15.32 < 10.28 < 10.19 < 7.46 < 36.29 < 12.96 20061125 MRUP 10!11/2006 < 8.41 < 9.81 < 16.04 < 6.29 < 19.53 < 935 < 9.46 < 10.10 < 8.00 < 7.55 < 36.46 < 14.86 20061 126 MRDOWN* 10/11/2006 < 8.71 < 9.34 < 15.95 < 8.19 < 18.00 < 6.96 < 15.50 < 12.09 < 5.85 < 9.03 < 25.80 < 1396 20061 127 M R D O W GG* 10/11/2006 < 1 1.59 < 11.00 < 24.13 < 9.63 < 15.52 < 10.79 < 13.12 < 11.36 < 11.11 < 11.33 < 47.34 < 14.76 GG - indicates duplicate sample.
- Annual Sample collected during liquid discharge 56
Table 3.2 Sample Type: Surface Water Analysis: Tritium C'nits: yCiil SURFACE WATER SAMPLES (TRITIUM) - GGNS LLD ( pCi/l) SURFACE WATER H-3 3000 LAB ID LOCATION DATE TRITIUM 20060034 MR DOWN 111012006 < 576 20060035 MRUP 1/10/2006 < 572 20060036 MRDOWN GG 111012006 < 569 20060037 MRUP GG 111012006 < 574 20060038 OUTFALL 007 111012006 < 580 20060165 OUTFALL 007 2/7/2006 1,220 +I- 273 20060273 OUTFALL 007 3/7/2006 < 566 20060402 OUTFALL 007 4/4/2006 845 +I-262 20060433 MR DOWN 411 112006 < 584 20060435 m U P 411 112006 < 581 20060553 OUTFALL 007 5/8/2006 < 588 20060617 OUTFALL 007 61612006 < 577 2006074 1 OUTFALL 007 7/4/2006 < 581 20060768 MR DOWN 711112006 < 589 20060770 MRUP 711 112006 < 589 20060862 OUTFALL 007 8/7/2006 598 +I-259 20060954 OUTFALL 007 9/6/2006 373 +/-254 20061 105 OUTFALL 007 10/6/2006 354 +l-250 2006 1124 MRDOWN 1011112006 < 567 20061 125 MRUP 1011112006 < 565 20061 126" MRDOWN 1011112006 < 572 20061229 OUTFALL 007 11/3/2006 < 566 2006 1242 OUTFALL 007 11/14/2006 < 562 2006 133 1 OUTFALL 007 12/4/2006 < 633
- Annual Saniple collected during liquid discharge "GG" - indicates duplicate saniple.
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fable 4.1 Sample Type: Groundwater Analysis: Gamma Isotopic TJnits: pCi/l GROUND WATER SAMPLES (GAMMA) - GGIVS LLD (pcill) 15 15 30 15 30 15 30 15 18 60 15 LAB ID LOCATION DATE MN-54 CO-58 FE-59 CO-60 ZN-65 NB-95 ZR-95 CS-134 CS-137 BA-I40 LA-140 20061209 PGWELL 10130106 < 13.38 < 9.82 < 15.47 < 11.74 < 24.15 < 12.38 < 13.52 < 11.63 < 8.31 < 42.88 < 14.52 20061210 CONSTWELL 10/30106 < 9.25 < 9.68 < 16.25 < 9.96 < 17.48 < 11.12 < 18.33 < 7.49 < 11.88 <44.76 < 13.30 20061211 PGWELL GG 10130106 < 9.93 < 8.51 < 14.51 < 8.07 < 17.22 < 11.48 < 14.35 < 10.24 < 8.67 c 34.42 < 14.32 20061212 CONSTWELL GG 10130106 < 8.95 < 6.73 < 18.39 c 7.57 < 22.52 < 9.24 < 15.39 < 9.73 < 7.73 < 38.75 < 11.61 GG - indicates duplicate sample.
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Table 4.2 Sample Type: Groundwater Analysis: Tritium Units: pCiil GROUND WATER SAMPLES ( TRITTUM) - GGNS LLD (pCi/l) 2000 LAB ID LOCATION DATE TRITIUM 20061209 PGWELL 1013012006 < 562.12 2006 1210 CONSTWELL 1013012006 < 563.39 59
Table 4.3 Sample T-ype: Groundwater Analysis: Iodine Units: pCiil GROUND WATER SAMPLES (Iodine-131) - GGNS LLD(pCi/l) 1.o L.4B ID LOCATIOS DATE 1-131 2003 1209 PGWELL 10/30/2006 < 0.90 20061210 CONSTWELL 10/30/2006 < 0.88 60
Table 5.1 Sample Type: Sediment Analysis: Gamma isotopic Units: pCi;kg SEDIMENT SAMPLES (GAMMA) - GGNS LLD (pCi/KG) 150 180 LAB ID LOCATION DATE CS-134 CS-137 20061 128 SEDHAM 10/11/2006 < 23.94 50.64 +I- 12.76 20061 129 SEDCONT 10/11/2006 < 17.53 < 18.92 20061 130 SEDHAM GG lO/l1/2006 < 27.42 35.99 +I- 15.17 20061 131 SEDCONT GG 10/11/2006 < 22.68 < 20.94 "GCJ" - indicates duplicate sample.
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lablc6.1 Sample Type: Fistl Analysis: Gamma Tsotopic LJnlts: pCi1kg FISH SAMPLES (GAMMA) - GGNS LLD (pCi/kg) 130 130 260 130 260 130 150 LAB ID LOCATION DATE MN-54 CO-58 FE-59 CO-60 ZN-65 CS-134 CS-137 200608 14 FISHUP 712012006 < 9.89 < 15.43 < 28.79 < 13.28 < 26.68 < 9.53 < 15.23 200608 15 FISHDOWN 712012006 < 11.38 < 11.42 < 37.68 < 15.82 < 27.24 < 11.93 < 11.90 200608 16 FISHUP GG 712012006 < 15.75 < 13.05 < 40.23 < 22.19 < 38.66 < 12.36 < 14.79 20060817 FISHDOWN GG 712012006 < 14.87 < 14.03 < 35.64 < 16.44 < 42.55 < 9.84 < 14.68 CX - indicates duplicate sample.
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Table 7.1 Sample Type: Food Products Analysis: Iodine-13 1 and Gamma Tsotopjc IJnits: yC11kg VEGETATION SAMPLES (GAMMA) - GGNS LLD (pCi/kg) 60 60 80 LAB ID LOCATION DATE 1-131 CS-134 CS-137 2006005 1 VEG-CONT 1110/2006 < 31.50 < 27.36 < 24.88 20060052 VEG-J 111012006 < 59.48 < 35.38 < 40.17 20060054 VEG-J GG 111012006 < 59.20 < 28.16 < 44.21 20060055 VEG-CONT GG 111012006 < 26.31 < 26.55 < 26.54 2006053 1 VEG-CONT 412 1I2006 < 41.67 < 25.61 < 19.27 20060532 VEG-J 412112006 < 50.48 < 29.51 < 27.74 200608 10 VEG-CONT 711912006 < 46.41 < 37.13 < 39.88 200608 11 VEG-J 711912006 < 58.29 < 22.42 < 44.55 20061213 VEG-CONT 1013012006 < 59.78 < 43.48 < 45.72 20061214 VEG-J lOl3012006 < 55.32 < 27.59 < 35.53 GG - indicates duplicate saiiiplc.
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Table 8. I Sample Type: Special Samples Analysis: Gamma Isotopic IJnits: pCi/kg SPECIAL VENISON SAMPLES (GAMMA) - GGNS LLD (pCi/kg) 130 130 260 130 260 130 150 LAB ID LOCATION DATE MN-54 CO-58 FE-59 CO-60 ZN-65 CS-134 CS-137 20061230 VENlSON 111312006 < 23.49 < 30.83 < 72.85 < 23.32 < 56.11 < 20.34 < 19.41 SPECIAL VEGETATION SAMPLES (GAMMA) - GGNS LLD (pCi/kg) 60 60 80 LAB ID LOCATION DATE 1-131 CS-134 CS-137 20060842 HAY 712712006 < 14.92 < 10.40 < 11.99 SPECIAL SURFACE U'ATER SAMPLES (GAMMA) - GGNS LLD @Ci/l) 15 15 30 15 30 15 30 15 15 18 60 15 LABID LOCATION DATE MN-54 CO-58 FE-59 CO-60 ZN-65 VB-95 ZR-95 1-131 CS-134 CS-137 RA-140 LA-140 20060038 OUTFALL007 1/10/2006 < 7.81 < 9.18 < 11.99 < 5.07 < 21.44 < 10.11 < 19.42 < 14.64 < 11.05 < 12.87 < 40.92 < 14.90 20060398 OUTFALL007 41412006 < 7.75 < 10.80 < 17.86 < 10.60 < 18.72 c: 10.34 < 10.76 < 11.21 < 11.53 < 10.70 < 36.54 < 14.62 20060737 OUTFALL007 7/4/2006 < 8.12 < 8.58 < 22.39 < 13.22 < 23.32 < 8.24 < 19.39 < 12.14 < 5.18 < 9.74 < 39.86 < 9.20 20061106 OUTFALL007 10/6/2006 < 8.09 < 7.55 < 17.00 < 8.16 < 21.65 4 8.46 < 17.03 < 11.97 < 8.94 < 9.52 < 45.30 < 12.64 20061243 OUIFALL007 11/14/2006 < 9 14 < 1023 < 1349 < 495 < 21 60 < 862 < 1599 < 897 < 968 < 12.49 < 30.93 < 10.54 64
Table 9. I Sample Type: In terlaboratorv Comparison Analysis: Gross Beta, Tritium, Iodine-13 1 and Gamma Isotopic l-iT Sample Type Sample #
E5008-125 Cartridge Water E5007-125 (pcilliter) E5006-125 E5083-125 E5081-125 E5237-125 E5082-125 65
I Sample Type Sample # Date Analysis Known RBS Value RBS N-DEV RBS N-(units) Val ue(a) (b) RANGE(c)
Milk E5009-125 (pcilliter)
NOTES:
(a) The known value as determined by cross check sample supplier.
(b) The normalized deviation from the "known" value is computed from the deviation and the standard error of the mean: f2.00is the warning limit and k3.00 is the control limit. This is a measure of accuracy of the analytical methods.
(c) The normalized range is computed from the mean range, the control limit, and the standard error of the range: +2.000 is the warning limit and +3.000 is the control limit. This is a measure of precision of the analytical methods.
(d) The results were outside control limits.
There was one result outside the control limits for accuracy in the 2006 Interlaboratory Comparison program studies. Sample E5007-125 gross beta in water was 0.006% outside the Lower Control Limit.
In October 2006, a new gross beta in water sample was prepared using the same source material. The results were within the acceptance criteria. The same sample was analyzed on a different alphabeta counter. The results on the new instrument were within the control limits.
Review of trending information of gross beta in water results shows a fluctuation of high and low values. In 2000 there was another occurrence of gross beta in water below the control limit of 3.0. The supplier for the interlaboratory crosscheck samples was contacted to determine if a low bias was present in gross beta in water by other participants. A low bias response was not present.
The most probable cause of the low sample result was sample preparation error. The low result could also have been due to machine age or an intermittent issue, but other samples counted on the same machine were within the control level. The new sample that was counted lends the most logical conclusion that a preparation error could have occurred during mixing, transfer or evaporation of the sample media.
There is no impact accessed on previously reported data due to these results. Environmental samples are analyzed and reported with a ninety-five percent confidence level. A known standard is counted with each group of samples and must read within 10 percent of the decay corrected activity. 98% of interlaboratory crosscheck results were within control limits for accuracy and 100% were within control limits for precision.
66